Bump Version to 0.0.16

Merge pull request #28 from stakater/update-library-version
Update library version
2026-02-15 02:19:50 +00:00 · 2018-10-01 12:30:26 +00:00 · 2018-10-01 17:04:07 +05:00 · 2018-10-01 17:02:48 +05:00 · 2018-10-01 16:42:02 +05:00 · 2018-10-01 16:40:47 +05:00
38 changed files with 2686 additions and 317 deletions
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,5 @@ release
 out/
 _gopath/
 .DS_Store
+.vscode
 vendor
--- a/.version
+++ b/.version
@@ -1 +1 @@
-0.0.1
+0.0.16
--- a/2
+++ b/2
@@ -1,5 +1,5 @@
 #!/usr/bin/groovy
-@Library('github.com/stakater/fabric8-pipeline-library@v2.4.0')
+@Library('github.com/stakater/fabric8-pipeline-library@v2.7.2')

 def dummy

--- a/201
+++ b/201
@@ -0,0 +1,201 @@
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--- a/2
+++ b/2
@@ -32,7 +32,7 @@ binary-image: builder-image
 	@docker run --network host --rm "${BUILDER}" | docker build --network host -t "${REPOSITORY}" -f Dockerfile.run -

 test:
-	"$(GOCMD)" test -v ./...
+	"$(GOCMD)" test -timeout 1800s -v ./...

 stop:
 	@docker stop "${BINARY}"
--- a/README.md
+++ b/README.md
@@ -1,63 +1,84 @@
-# RELOADER
+# ![](assets/web/reloader-round-100px.png) RELOADER

-## WHY NAME RELOADER
-
-In english language, Reloader is a thing/tool that can reload certain stuff. So refereig to that meaning relaoder can reload
+[![Go Report Card](https://goreportcard.com/badge/github.com/stakater/reloader?style=flat-square)](https://goreportcard.com/report/github.com/stakater/reloader)
+[![Go Doc](https://img.shields.io/badge/godoc-reference-blue.svg?style=flat-square)](http://godoc.org/github.com/stakater/reloader)
+[![Release](https://img.shields.io/github/release/stakater/reloader.svg?style=flat-square)](https://github.com/stakater/reloader/releases/latest)
+[![GitHub tag](https://img.shields.io/github/tag/stakater/reloader.svg?style=flat-square)](https://github.com/stakater/reloader/releases/latest)
+[![Docker Pulls](https://img.shields.io/docker/pulls/stakater/reloader.svg?style=flat-square)](https://hub.docker.com/r/stakater/reloader/)
+[![Docker Stars](https://img.shields.io/docker/stars/stakater/reloader.svg?style=flat-square)](https://hub.docker.com/r/stakater/reloader/)
+[![MicroBadger Size](https://img.shields.io/microbadger/image-size/stakater/reloader.svg?style=flat-square)](https://microbadger.com/images/stakater/reloader)
+[![MicroBadger Layers](https://img.shields.io/microbadger/layers/stakater/reloader.svg?style=flat-square)](https://microbadger.com/images/stakater/reloader)
+[![license](https://img.shields.io/github/license/stakater/reloader.svg?style=flat-square)](LICENSE)
+[![Get started with Stakater](https://stakater.github.io/README/stakater-github-banner.png)](http://stakater.com/?utm_source=Reloader&utm_medium=github)

 ## Problem

-We would like to watch if some change happens in `ConfigMap` and `Secret` objects and then perform certain upgrade on relavent `Deployment`, `Deamonset` and `Statefulset`
+We would like to watch if some change happens in `ConfigMap` and/or `Secret`; then perform a rolling upgrade on relevant `Deployment`, `Deamonset` and `Statefulset`

 ## Solution

-Reloader can watch any changes in `ConfigMap` and `Secret` objects and update or recreate Pods for their associated `Deployments`, `Deamonsets` and `Statefulsets`. In this way Pods can get the latest changes in `ConfigMap` or `Secret` objects.
-
-**NOTE:** This controller has been inspired from [configmapController](https://github.com/fabric8io/configmapcontroller)
+Reloader can watch changes in `ConfigMap` and `Secret` and do rolling upgrades on Pods with their associated `Deployments`, `Deamonsets` and `Statefulsets`.

 ## How to use Reloader

-For a `Deployment` called `foo` have a `ConfigMap` called `foo`. Then add this annotation to your `Deployment`
+For a `Deployment` called `foo` have a `ConfigMap` called `foo-configmap`. Then add this annotation to your `Deployment`

 ```yaml
 metadata:
  annotations:
-    reloader.stakater.com/update-on-change: "foo"
+    configmap.reloader.stakater.com/reload: "foo-configmap"
 ```

-Then, providing `Reloader` is running, whenever you edit the `ConfigMap` called `foo` the Reloader will update the `Deployment` by adding the environment variable:
+OR

+For a `Deployment` called `foo` have a `Secret` called `foo-secret`. Then add this annotation to your `Deployment`
+
+```yaml
+metadata:
+  annotations:
+    secret.reloader.stakater.com/reload: "foo-secret"
 ```
-STAKATER_FOO_REVISION=${reloaderRevision}
-```
-
-This then triggers a rolling upgrade of your deployment's pods to use the new configuration.
-
-Same procedure can be followed to perform rolling upgrade on `Deamonsets` and `Statefulsets` as well.

 ## Deploying to Kubernetes

-You can deploy Reloader by running the following kubectl commands:
+You can deploy Reloader by following methods:
+
+### Vanilla Manifests
+
+You can apply vanilla manifests by running the following command

 ```bash
-kubectl apply -f rbac.yaml -n <namespace>
-kubectl apply -f deployment.yaml -n <namespace>
+kubectl apply -f https://raw.githubusercontent.com/stakater/Reloader/master/deployments/kubernetes/reloader.yaml
 ```

+By default Reloader gets deployed in `default` namespace and watches changes `secrets` and `configmaps` in all namespaces.
+
 ### Helm Charts

-Or alternatively if you configured `helm` on your cluster, you can deploy Reloader via helm chart located under `deployments/kubernetes/chart/reloader` folder.
+Alternatively if you have configured helm on your cluster, you can add reloader to helm from our public chart repository and deploy it via helm using below mentioned commands
+
+ ```bash
+helm repo add stakater https://stakater.github.io/stakater-charts
+
+helm repo update
+
+helm install stakater/reloader
+```

 ## Help

-**Got a question?**
+### Documentation
+You can find more documentation [here](docs/)
+
+### Have a question?
 File a GitHub [issue](https://github.com/stakater/Reloader/issues), or send us an [email](mailto:stakater@gmail.com).

 ### Talk to us on Slack

-Join and talk to us on the #tools-imc channel for discussing Reloader
+Join and talk to us on Slack for discussing Reloader

 [![Join Slack](https://stakater.github.io/README/stakater-join-slack-btn.png)](https://stakater-slack.herokuapp.com/)
-[![Chat](https://stakater.github.io/README/stakater-chat-btn.png)](https://stakater.slack.com/messages/CAN960CTG/)
+[![Chat](https://stakater.github.io/README/stakater-chat-btn.png)](https://stakater.slack.com/)

 ## Contributing

@@ -94,3 +115,7 @@ or contact us in case of professional services and queries on <hello@stakater.co

  [website]: http://stakater.com/
  [community]: https://github.com/stakater/
+
+## Acknowledgements
+
+- [ConfigmapController](https://github.com/fabric8io/configmapcontroller); We documented here why we re-created [Reloader](docs/Reloader-vs-ConfigmapController.md)
--- a/assets/web/reloader-round-100px.png
+++ b/assets/web/reloader-round-100px.png
--- a/deployments/kubernetes/chart/reloader/Chart.yaml
+++ b/deployments/kubernetes/chart/reloader/Chart.yaml
@@ -3,7 +3,7 @@
 apiVersion: v1
 name: reloader
 description: Reloader chart that runs on kubernetes
-version: 0.0.1
+version: 0.0.16
 keywords:
  - Reloader
  - kubernetes
--- a/deployments/kubernetes/chart/reloader/templates/deployment.yaml
+++ b/deployments/kubernetes/chart/reloader/templates/deployment.yaml
@@ -18,10 +18,12 @@ spec:
    spec:
      containers:
      - env:
+      {{- if eq .Values.reloader.watchGlobally false }}
        - name: KUBERNETES_NAMESPACE
          valueFrom:
            fieldRef:
              fieldPath: metadata.namespace
+      {{- end }}
        image: "{{ .Values.reloader.image.name }}:{{ .Values.reloader.image.tag }}"
        imagePullPolicy: {{ .Values.reloader.image.pullPolicy }}
        name: {{ template "reloader-name" . }}
--- a/deployments/kubernetes/chart/reloader/templates/rbac.yaml
+++ b/deployments/kubernetes/chart/reloader/templates/rbac.yaml
@@ -6,6 +6,56 @@ metadata:
 {{ include "reloader-labels.chart" . | indent 4 }}
  name: {{ template "reloader-name" . }}
 ---
+{{- if .Values.reloader.watchGlobally }}
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  labels: 
+{{ include "reloader-labels.stakater" . | indent 4 }}
+{{ include "reloader-labels.chart" . | indent 4 }}
+  name: {{ template "reloader-name" . }}-role
+  namespace: {{ .Release.Namespace }}
+rules:
+  - apiGroups:
+      - ""
+    resources:      
+      - secrets
+      - configmaps
+    verbs:
+      - list
+      - get
+      - watch
+  - apiGroups:
+      - ""
+      - "extensions"
+      - "apps"
+    resources:
+      - deployments
+      - daemonsets
+      - statefulsets
+    verbs:
+      - list
+      - get
+      - update
+      - patch
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  labels: 
+{{ include "reloader-labels.stakater" . | indent 4 }}
+{{ include "reloader-labels.chart" . | indent 4 }}
+  name: {{ template "reloader-name" . }}-role-binding
+  namespace: {{ .Release.Namespace }}
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: {{ template "reloader-name" . }}-role
+subjects:
+  - kind: ServiceAccount
+    name: {{ template "reloader-name" . }}
+    namespace: {{ .Release.Namespace }}
+{{- else }}
 apiVersion: rbac.authorization.k8s.io/v1beta1
 kind: Role
 metadata:
@@ -24,6 +74,19 @@ rules:
      - list
      - get
      - watch
+  - apiGroups:
+      - ""
+      - "extensions"
+      - "apps"
+    resources:
+      - deployments
+      - daemonsets
+      - statefulsets
+    verbs:
+      - list
+      - get
+      - update
+      - patch
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
 kind: RoleBinding
@@ -40,4 +103,5 @@ roleRef:
 subjects:
  - kind: ServiceAccount
    name: {{ template "reloader-name" . }}
-    namespace: {{ .Release.Namespace }}
+    namespace: {{ .Release.Namespace }}
+{{- end }}
--- a/deployments/kubernetes/chart/reloader/values.yaml
+++ b/deployments/kubernetes/chart/reloader/values.yaml
@@ -7,8 +7,9 @@ reloader:
  labels:
    provider: stakater
    group: com.stakater.platform
-    version: 0.0.1
+    version: 0.0.16
  image:
    name: stakater/reloader
-    tag: "0.0.1"
-    pullPolicy: IfNotPresent
+    tag: "0.0.16"
+    pullPolicy: IfNotPresent
+  watchGlobally: true
--- a/deployments/kubernetes/manifests/deployment.yaml
+++ b/deployments/kubernetes/manifests/deployment.yaml
@@ -7,8 +7,8 @@ metadata:
    app: reloader
    group: com.stakater.platform
    provider: stakater
-    version: 0.0.1
-    chart: "reloader-0.0.1"
+    version: 0.0.16
+    chart: "reloader-0.0.16"
    release: "RELEASE-NAME"
    heritage: "Tiller"
  name: reloader
@@ -29,11 +29,7 @@ spec:
    spec:
      containers:
      - env:
-        - name: KUBERNETES_NAMESPACE
-          valueFrom:
-            fieldRef:
-              fieldPath: metadata.namespace
-        image: "stakater/reloader:0.0.1"
+        image: "stakater/reloader:0.0.16"
        imagePullPolicy: IfNotPresent
        name: reloader
      serviceAccountName: reloader
--- a/deployments/kubernetes/manifests/rbac.yaml
+++ b/deployments/kubernetes/manifests/rbac.yaml
@@ -7,25 +7,25 @@ metadata:
    app: reloader
    group: com.stakater.platform
    provider: stakater
-    version: 0.0.1
-    chart: "reloader-0.0.1"
+    version: 0.0.16
+    chart: "reloader-0.0.16"
    release: "RELEASE-NAME"
    heritage: "Tiller"
  name: reloader
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: Role
+kind: ClusterRole
 metadata:
  labels: 
    app: reloader
    group: com.stakater.platform
    provider: stakater
-    version: 0.0.1
-    chart: "reloader-0.0.1"
+    version: 0.0.16
+    chart: "reloader-0.0.16"
    release: "RELEASE-NAME"
    heritage: "Tiller"
  name: reloader-role
-  namespace: tools
+  namespace: default
 rules:
  - apiGroups:
      - ""
@@ -36,25 +36,38 @@ rules:
      - list
      - get
      - watch
+  - apiGroups:
+      - ""
+      - "extensions"
+      - "apps"
+    resources:
+      - deployments
+      - daemonsets
+      - statefulsets
+    verbs:
+      - list
+      - get
+      - update
+      - patch
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: RoleBinding
+kind: ClusterRoleBinding
 metadata:
  labels: 
    app: reloader
    group: com.stakater.platform
    provider: stakater
-    version: 0.0.1
-    chart: "reloader-0.0.1"
+    version: 0.0.16
+    chart: "reloader-0.0.16"
    release: "RELEASE-NAME"
    heritage: "Tiller"
  name: reloader-role-binding
-  namespace: tools
+  namespace: default
 roleRef:
  apiGroup: rbac.authorization.k8s.io
-  kind: Role
+  kind: ClusterRole
  name: reloader-role
 subjects:
  - kind: ServiceAccount
    name: reloader
-    namespace: tools
+    namespace: default
--- a/deployments/kubernetes/reloader.yaml
+++ b/deployments/kubernetes/reloader.yaml
@@ -0,0 +1,109 @@
+---
+# Source: reloader/templates/deployment.yaml
+apiVersion: extensions/v1beta1
+kind: Deployment
+metadata:
+  labels:
+    app: reloader
+    group: com.stakater.platform
+    provider: stakater
+    version: 0.0.16
+    chart: "reloader-0.0.16"
+    release: "RELEASE-NAME"
+    heritage: "Tiller"
+  name: reloader
+spec:
+  replicas: 1
+  revisionHistoryLimit: 2
+  selector:
+    matchLabels:
+      app: reloader
+      group: com.stakater.platform
+      provider: stakater
+  template:
+    metadata:
+      labels:
+        app: reloader
+        group: com.stakater.platform
+        provider: stakater
+    spec:
+      containers:
+      - env:
+        image: "stakater/reloader:0.0.16"
+        imagePullPolicy: IfNotPresent
+        name: reloader
+      serviceAccountName: reloader
+              
+---
+# Source: reloader/templates/rbac.yaml
+apiVersion: v1
+kind: ServiceAccount
+metadata:
+  labels:
+    app: reloader
+    group: com.stakater.platform
+    provider: stakater
+    version: 0.0.16
+    chart: "reloader-0.0.16"
+    release: "RELEASE-NAME"
+    heritage: "Tiller"
+  name: reloader
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRole
+metadata:
+  labels: 
+    app: reloader
+    group: com.stakater.platform
+    provider: stakater
+    version: 0.0.16
+    chart: "reloader-0.0.16"
+    release: "RELEASE-NAME"
+    heritage: "Tiller"
+  name: reloader-role
+  namespace: default
+rules:
+  - apiGroups:
+      - ""
+    resources:      
+      - secrets
+      - configmaps
+    verbs:
+      - list
+      - get
+      - watch
+  - apiGroups:
+      - ""
+      - "extensions"
+      - "apps"
+    resources:
+      - deployments
+      - daemonsets
+      - statefulsets
+    verbs:
+      - list
+      - get
+      - update
+      - patch
+---
+apiVersion: rbac.authorization.k8s.io/v1beta1
+kind: ClusterRoleBinding
+metadata:
+  labels: 
+    app: reloader
+    group: com.stakater.platform
+    provider: stakater
+    version: 0.0.16
+    chart: "reloader-0.0.16"
+    release: "RELEASE-NAME"
+    heritage: "Tiller"
+  name: reloader-role-binding
+  namespace: default
+roleRef:
+  apiGroup: rbac.authorization.k8s.io
+  kind: ClusterRole
+  name: reloader-role
+subjects:
+  - kind: ServiceAccount
+    name: reloader
+    namespace: default
--- a/deployments/kubernetes/templates/chart/values.yaml.tmpl
+++ b/deployments/kubernetes/templates/chart/values.yaml.tmpl
@@ -11,4 +11,5 @@ reloader:
  image:
    name: {{ getenv "DOCKER_IMAGE" }}
    tag: "{{ getenv "VERSION" }}"
-    pullPolicy: IfNotPresent
+    pullPolicy: IfNotPresent
+  watchGlobally: true
--- a/docs/How-it-works.md
+++ b/docs/How-it-works.md
@@ -0,0 +1,77 @@
+# How it works?
+
+Reloader watches for `ConfigMap` and `Secret` and detects if there are changes in data of these objects. After change detection reloader performs rolling upgrade on relevant Pods via associated `Deployment`, `Deamonset` and `Statefulset`.
+
+## How change detection works
+
+Reloader watches changes in `configmaps` and `secrets` data. As soon as it detects a change in these. It forwards these objects to an update handler which decides if and how to perform the rolling upgrade.
+
+## Requirements for rolling upgrade
+
+To perform rolling upgrade a `deployment`, `daemonset` or `statefulset` must have
+
+- support for rolling upgrade strategy
+- specific annotation for `configmaps` or `secrets`
+
+The annotation value is comma separated list of `configmaps` or `secrets`. If a change is detected in data of these `configmaps` or `secrets`, reloader will perform rolling upgrades on their associated `deployments`, `daemonsets` or `statefulsets`.
+
+### Annotation for Configmap
+
+For a `Deployment` called `foo` have a `ConfigMap` called `foo`. Then add this annotation to your `Deployment`
+
+```yaml
+metadata:
+  annotations:
+    configmap.reloader.stakater.com/reload: "foo"
+```
+
+### Annotation for Secret
+
+For a `Deployment` called `foo` have a `Secret` called `foo`. Then add this annotation to your `Deployment`
+
+```yaml
+metadata:
+  annotations:
+    secret.reloader.stakater.com/reload: "foo"
+```
+
+Above mentioned annotation are also work for `Daemonsets` and `Statefulsets`
+
+## How Rolling upgrade works?
+
+When reloader detects changes in configmap. It gets two objects of configmap. First object is an old configmap object which has a state before the latest change. Second object is new configmap object which contains latest changes. Reloader compares both objects and see whether any change in data occurred or not. If reloader finds any change in new configmap object, only then, it move forward with rolling upgrade.
+
+After that, reloader gets the list of all deployments, daemonsets and statefulset and looks for above mentioned annotation for configmap. If the annotation value contains the configmap name, it then looks for an environment variable which can contain the configmap or secret data change hash.
+
+### Environment variable for Configmap
+
+If configmap name is foo then
+
+```yaml
+STAKATER_FOO_CONFIGMAP
+```
+
+### Environment variable for Secret
+
+If Secret name is foo then
+
+```yaml
+STAKATER_FOO_SECRET
+```
+
+If the environment variable is found then it gets its value and compares it with new configmap hash value. If old value in environment variable is different from new hash value then reloader updates the environment variable. If the environment variable does not exist then it creates a new environment variable with latest hash value from configmap and updates the relevant `deployment`, `daemonset` or `statefulset`
+
+Note: Rolling upgrade also works in the same way for secrets.
+
+### Hash value Computation
+
+Reloader uses SHA1 to compute hash value. SHA1 is used because it is efficient and less prone to collision.
+
+## Monitor All Namespaces
+
+By default reloader deploys in default namespace and monitors changes in all namespaces. To monitor changes in a specific namespace deploy the reloader in that namespace and set the `watchGlobally` flag to `false` in values file located under `deployments/kubernetes/chart/reloader`
+And render manifest file using helm command
+```bash
+helm --namespace {replace this with namespace name} template . > reloader.yaml
+```
+The output file can then be used to deploy reloader in specific namespace.
--- a/docs/Reloader-vs-ConfigmapController.md
+++ b/docs/Reloader-vs-ConfigmapController.md
@@ -0,0 +1,11 @@
+
+# Reloader vs ConfigmapController
+
+Reloader is inspired from [Configmapcontroller](https://github.com/fabric8io/configmapcontroller) but there are many ways in which it differs from configmapController. Below is the small comparison between these two controllers.
+
+| Reloader                                                                                                                                                                                                                                                                                                                 | Configmap                                                                                                                                                                                                                                                          |
+|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
+| Reloader can watch both `secrets` and `configmaps`.                                                                                                                                                                                                                                                    | ConfigmapController can only watch changes in `configmaps`. It cannot detect changes in other resources like `secrets`.                                                                                                                                        |
+| Reloader can perform rolling upgrades on `deployments` as well as on `statefulsets` and `daemonsets`                                                                                                                                                                                                   | ConfigmapController can only perform rolling upgrades on `deployments`. It currently does not support rolling upgrades on `statefulsets` and `daemonsets`                                                                                                          |
+| Reloader provides both unit test cases and end to end integration test cases for future updates. So one can make sure that new changes do not break any old functionality.                                                                                                                                               | Currently there are not any unit test cases or end to end integration test cases in configmap controller. It add difficulties for any additional updates in configmap controller and one can not know for sure whether new changes breaks any old functionality or not. |
+| Reloader uses SHA1 to encode the change in configmap or secret. It then saves the SHA1 value in `STAKATER_FOO_CONFIGMAP` or `STAKATER_FOO_SECRET` environment variable depending upon where the change has happened. The use of SHA1 provides a concise 40 characters encoded value that is very less pron to collision. | Configmap controller uses `FABRICB_FOO_REVISION` environment variable to store any change in configmap controller. It does not encode it or convert it in suitable hash value to avoid data pollution in deployment.                                               |
--- a/docs/Reloader-vs-k8s-trigger-controller.md
+++ b/docs/Reloader-vs-k8s-trigger-controller.md
@@ -0,0 +1,28 @@
+# Reloader vs k8s-trigger-controller
+
+Reloader and k8s-trigger-controller are both built for same purpose. So there are quite a few similarities and differences between these.
+
+## Similarities
+
+- Both controllers support change detection in configmap and secrets
+- Both controllers support deployment rollout
+- Both controllers use SHA1 for hashing
+- Both controllers have end to end as well as unit test cases.
+
+## Differences
+
+### Support for Daemonsets and Statefulsets.
+
+#### k8s-trigger-controller:
+k8s-trigger-controller only support for deployment rollout. It does not support daemonsets and statefulsets rollout.
+
+#### Reloader:
+Reloader supports deployment rollout as well as daemonsets and statefulsets rollout.
+
+### Hashing usage
+
+#### k8s-trigger-controller:
+k8s-trigger-controller stores the hash value in an annotation `trigger.k8s.io/[secret|configMap]-NAME-last-hash`
+
+#### Reloader:
+Reloader stores the hash value in an environment variable `STAKATER_NAME_[SECRET|CONFIGMAP]`
--- a/docs/Verify-Reloader-Working.md
+++ b/docs/Verify-Reloader-Working.md
@@ -0,0 +1,51 @@
+# Verify Reloader's Working
+
+Reloader's working can be verified by two ways.
+
+## Verify from logs
+
+Check the logs of reloader and verify that you can see logs looks like below, if you are able to find these logs then it means reloader is working.
+
+```text
+Changes Detected in test-object of type 'SECRET' in namespace: test-reloader
+
+Updated test-resource of type Deployment in namespace: test-reloader
+```
+
+Below are the details that explain these logs:
+
+### test-object
+
+`test-object` is the name of a `secret` or a `deployment` in which change has been detected.
+
+### SECRET
+
+`SECRET` is the type of `test-object`. It can either be `SECRET` or `CONFIGMAP`
+
+### test-reloader
+
+`test-reloader` is the name of namespace in which reloader has detected the change.
+
+### test-resource
+
+`test-resource` is the name of resource which is going to be updated
+
+### Deployment
+
+`Deployment` is the type of `test-resource`. It can either be a `Deployment`, `Daemonset` or `Statefulset`
+
+## Verify by checking the age of Pod
+
+A pod's age can tell whether reloader is working correctly or not. If you know that a change in a `secret` or `configmap` has occurred, then check the relevant Pod's age immediately. It should be newly created few moments ago.
+
+### Verify from kubernetes Dashboard
+
+`kubernetes dashboard` can be used to verify the working of Reloader. After a change in `secret` or `configmap`, check the relevant Pod's age from dashboard. It should be newly created few moments ago.
+
+### Verify from command line
+
+After a change in `secret` or `configmap`. Run the below mentioned command and verify that the pod is newly created.
+
+```bash
+kubectl get pods <pod name> -n <namespace name>
+```
--- a/docs/features.md
+++ b/docs/features.md
@@ -0,0 +1,7 @@
+# Features
+
+These are the key features of Reloader:
+
+1. Restart pod in a depoloyment on change in linked/related configmap's or secret's
+2. Restart pod in a daemonset on change in linked/related configmap's or secret's
+3. Restart pod in a statefulset on change in linked/related configmap's or secret's
--- a/glide.lock
+++ b/glide.lock
@@ -1,5 +1,5 @@
 hash: b6fe060028bdb1249ba2413746476c2550b267eeab3c166c36a86e000a8dd354
-updated: 2018-07-17T09:08:20.493153674Z
+updated: 2018-07-24T21:12:43.027181463+05:00
 imports:
 - name: github.com/davecgh/go-spew
  version: 782f4967f2dc4564575ca782fe2d04090b5faca8
@@ -90,13 +90,10 @@ imports:
  version: 1c05540f6879653db88113bc4a2b70aec4bd491f
  subpackages:
  - context
-  - html
-  - html/atom
  - http2
  - http2/hpack
  - idna
  - lex/httplex
-  - websocket
 - name: golang.org/x/sys
  version: 7ddbeae9ae08c6a06a59597f0c9edbc5ff2444ce
  subpackages:
@@ -194,35 +191,62 @@ imports:
  version: 35874c597fed17ca62cd197e516d7d5ff9a2958c
  subpackages:
  - discovery
+  - discovery/fake
  - kubernetes
+  - kubernetes/fake
  - kubernetes/scheme
  - kubernetes/typed/admissionregistration/v1alpha1
+  - kubernetes/typed/admissionregistration/v1alpha1/fake
  - kubernetes/typed/apps/v1beta1
+  - kubernetes/typed/apps/v1beta1/fake
  - kubernetes/typed/apps/v1beta2
+  - kubernetes/typed/apps/v1beta2/fake
  - kubernetes/typed/authentication/v1
+  - kubernetes/typed/authentication/v1/fake
  - kubernetes/typed/authentication/v1beta1
+  - kubernetes/typed/authentication/v1beta1/fake
  - kubernetes/typed/authorization/v1
+  - kubernetes/typed/authorization/v1/fake
  - kubernetes/typed/authorization/v1beta1
+  - kubernetes/typed/authorization/v1beta1/fake
  - kubernetes/typed/autoscaling/v1
+  - kubernetes/typed/autoscaling/v1/fake
  - kubernetes/typed/autoscaling/v2beta1
+  - kubernetes/typed/autoscaling/v2beta1/fake
  - kubernetes/typed/batch/v1
+  - kubernetes/typed/batch/v1/fake
  - kubernetes/typed/batch/v1beta1
+  - kubernetes/typed/batch/v1beta1/fake
  - kubernetes/typed/batch/v2alpha1
+  - kubernetes/typed/batch/v2alpha1/fake
  - kubernetes/typed/certificates/v1beta1
+  - kubernetes/typed/certificates/v1beta1/fake
  - kubernetes/typed/core/v1
+  - kubernetes/typed/core/v1/fake
  - kubernetes/typed/extensions/v1beta1
+  - kubernetes/typed/extensions/v1beta1/fake
  - kubernetes/typed/networking/v1
+  - kubernetes/typed/networking/v1/fake
  - kubernetes/typed/policy/v1beta1
+  - kubernetes/typed/policy/v1beta1/fake
  - kubernetes/typed/rbac/v1
+  - kubernetes/typed/rbac/v1/fake
  - kubernetes/typed/rbac/v1alpha1
+  - kubernetes/typed/rbac/v1alpha1/fake
  - kubernetes/typed/rbac/v1beta1
+  - kubernetes/typed/rbac/v1beta1/fake
  - kubernetes/typed/scheduling/v1alpha1
+  - kubernetes/typed/scheduling/v1alpha1/fake
  - kubernetes/typed/settings/v1alpha1
+  - kubernetes/typed/settings/v1alpha1/fake
  - kubernetes/typed/storage/v1
+  - kubernetes/typed/storage/v1/fake
  - kubernetes/typed/storage/v1beta1
+  - kubernetes/typed/storage/v1beta1/fake
  - pkg/version
  - rest
  - rest/watch
+  - testing
  - tools/auth
  - tools/cache
  - tools/clientcmd
--- a/internal/pkg/callbacks/rolling_upgrade.go
+++ b/internal/pkg/callbacks/rolling_upgrade.go
@@ -0,0 +1,91 @@
+package callbacks
+
+import (
+	"github.com/sirupsen/logrus"
+	"github.com/stakater/Reloader/internal/pkg/util"
+	apps_v1beta1 "k8s.io/api/apps/v1beta1"
+	"k8s.io/api/core/v1"
+	"k8s.io/api/extensions/v1beta1"
+	meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+)
+
+//ItemsFunc is a generic function to return a specific resource array in given namespace
+type ItemsFunc func(kubernetes.Interface, string) []interface{}
+
+//ContainersFunc is a generic func to return containers
+type ContainersFunc func(interface{}) []v1.Container
+
+//UpdateFunc performs the resource update
+type UpdateFunc func(kubernetes.Interface, string, interface{}) error
+
+//RollingUpgradeFuncs contains generic functions to perform rolling upgrade
+type RollingUpgradeFuncs struct {
+	ItemsFunc      ItemsFunc
+	ContainersFunc ContainersFunc
+	UpdateFunc     UpdateFunc
+	ResourceType   string
+}
+
+// GetDeploymentItems returns the deployments in given namespace
+func GetDeploymentItems(client kubernetes.Interface, namespace string) []interface{} {
+	deployments, err := client.ExtensionsV1beta1().Deployments(namespace).List(meta_v1.ListOptions{})
+	if err != nil {
+		logrus.Errorf("Failed to list deployments %v", err)
+	}
+	return util.InterfaceSlice(deployments.Items)
+}
+
+// GetDaemonSetItems returns the daemonSet in given namespace
+func GetDaemonSetItems(client kubernetes.Interface, namespace string) []interface{} {
+	daemonSets, err := client.ExtensionsV1beta1().DaemonSets(namespace).List(meta_v1.ListOptions{})
+	if err != nil {
+		logrus.Errorf("Failed to list daemonSets %v", err)
+	}
+	return util.InterfaceSlice(daemonSets.Items)
+}
+
+// GetStatefulSetItems returns the statefulSet in given namespace
+func GetStatefulSetItems(client kubernetes.Interface, namespace string) []interface{} {
+	statefulSets, err := client.AppsV1beta1().StatefulSets(namespace).List(meta_v1.ListOptions{})
+	if err != nil {
+		logrus.Errorf("Failed to list statefulSets %v", err)
+	}
+	return util.InterfaceSlice(statefulSets.Items)
+}
+
+// GetDeploymentContainers returns the containers of given deployment
+func GetDeploymentContainers(item interface{}) []v1.Container {
+	return item.(v1beta1.Deployment).Spec.Template.Spec.Containers
+}
+
+// GetDaemonSetContainers returns the containers of given daemonset
+func GetDaemonSetContainers(item interface{}) []v1.Container {
+	return item.(v1beta1.DaemonSet).Spec.Template.Spec.Containers
+}
+
+// GetStatefulsetContainers returns the containers of given statefulSet
+func GetStatefulsetContainers(item interface{}) []v1.Container {
+	return item.(apps_v1beta1.StatefulSet).Spec.Template.Spec.Containers
+}
+
+// UpdateDeployment performs rolling upgrade on deployment
+func UpdateDeployment(client kubernetes.Interface, namespace string, resource interface{}) error {
+	deployment := resource.(v1beta1.Deployment)
+	_, err := client.ExtensionsV1beta1().Deployments(namespace).Update(&deployment)
+	return err
+}
+
+// UpdateDaemonSet performs rolling upgrade on daemonSet
+func UpdateDaemonSet(client kubernetes.Interface, namespace string, resource interface{}) error {
+	daemonSet := resource.(v1beta1.DaemonSet)
+	_, err := client.ExtensionsV1beta1().DaemonSets(namespace).Update(&daemonSet)
+	return err
+}
+
+// UpdateStatefulset performs rolling upgrade on statefulSet
+func UpdateStatefulset(client kubernetes.Interface, namespace string, resource interface{}) error {
+	statefulSet := resource.(apps_v1beta1.StatefulSet)
+	_, err := client.AppsV1beta1().StatefulSets(namespace).Update(&statefulSet)
+	return err
+}
--- a/internal/pkg/constants/annotations.go
+++ b/internal/pkg/constants/annotations.go
@@ -0,0 +1,8 @@
+package constants
+
+const (
+	// ConfigmapUpdateOnChangeAnnotation is an annotation to detect changes in configmaps
+	ConfigmapUpdateOnChangeAnnotation = "configmap.reloader.stakater.com/reload"
+	// SecretUpdateOnChangeAnnotation is an annotation to detect changes in secrets
+	SecretUpdateOnChangeAnnotation = "secret.reloader.stakater.com/reload"
+)
--- a/internal/pkg/constants/constants.go
+++ b/internal/pkg/constants/constants.go
@@ -0,0 +1,10 @@
+package constants
+
+const (
+	// ConfigmapEnvVarPostfix is a postfix for configmap envVar
+	ConfigmapEnvVarPostfix = "CONFIGMAP"
+	// SecretEnvVarPostfix is a postfix for secret envVar
+	SecretEnvVarPostfix = "SECRET"
+	// EnvVarPrefix is a Prefix for environment variable
+	EnvVarPrefix = "STAKATER_"
+)
--- a/internal/pkg/controller/controller.go
+++ b/internal/pkg/controller/controller.go
@@ -9,7 +9,6 @@ import (
 	"github.com/stakater/Reloader/pkg/kube"
 	"k8s.io/apimachinery/pkg/fields"
 	"k8s.io/apimachinery/pkg/util/runtime"
-	errorHandler "k8s.io/apimachinery/pkg/util/runtime"
 	"k8s.io/apimachinery/pkg/util/wait"
 	"k8s.io/client-go/kubernetes"
 	"k8s.io/client-go/tools/cache"
@@ -65,15 +64,14 @@ func (c *Controller) Update(old interface{}, new interface{}) {

 // Delete function to add an object to the queue in case of deleting a resource
 func (c *Controller) Delete(old interface{}) {
-	// TODO Added this function for future usecase
-	logrus.Infof("Deleted resource has been detected but no further implementation found to take action")
+	logrus.Infof("Resource deletion has been detected but no further implementation found to take action")
 }

 //Run function for controller which handles the queue
 func (c *Controller) Run(threadiness int, stopCh chan struct{}) {

 	logrus.Infof("Starting Controller")
-	defer errorHandler.HandleCrash()
+	defer runtime.HandleCrash()

 	// Let the workers stop when we are done
 	defer c.queue.ShutDown()
@@ -82,7 +80,7 @@ func (c *Controller) Run(threadiness int, stopCh chan struct{}) {

 	// Wait for all involved caches to be synced, before processing items from the queue is started
 	if !cache.WaitForCacheSync(stopCh, c.informer.HasSynced) {
-		errorHandler.HandleError(fmt.Errorf("Timed out waiting for caches to sync"))
+		runtime.HandleError(fmt.Errorf("Timed out waiting for caches to sync"))
 		return
 	}

--- a/internal/pkg/controller/controller_test.go
+++ b/internal/pkg/controller/controller_test.go
--- a/internal/pkg/crypto/sha.go
+++ b/internal/pkg/crypto/sha.go
@@ -0,0 +1,20 @@
+package crypto
+
+import (
+	"crypto/sha1"
+	"fmt"
+	"io"
+
+	"github.com/sirupsen/logrus"
+)
+
+// GenerateSHA generates SHA from string
+func GenerateSHA(data string) string {
+	hasher := sha1.New()
+	_, err := io.WriteString(hasher, data)
+	if err != nil {
+		logrus.Errorf("Unable to write data in hash writer %v", err)
+	}
+	sha := hasher.Sum(nil)
+	return fmt.Sprintf("%x", sha)
+}
--- a/internal/pkg/crypto/sha_test.go
+++ b/internal/pkg/crypto/sha_test.go
@@ -0,0 +1,15 @@
+package crypto
+
+import (
+	"testing"
+)
+
+// TestGenerateSHA generates the sha from given data and verifies whether it is correct or not
+func TestGenerateSHA(t *testing.T) {
+	data := "www.stakater.com"
+	sha := "abd4ed82fb04548388a6cf3c339fd9dc84d275df"
+	result := GenerateSHA(data)
+	if result != sha {
+		t.Errorf("Failed to generate SHA")
+	}
+}
--- a/internal/pkg/handler/create.go
+++ b/internal/pkg/handler/create.go
@@ -0,0 +1,18 @@
+package handler
+
+import (
+	"github.com/sirupsen/logrus"
+)
+
+// ResourceCreatedHandler contains new objects
+type ResourceCreatedHandler struct {
+	Resource interface{}
+}
+
+// Handle processes the newly created resource
+func (r ResourceCreatedHandler) Handle() error {
+	if r.Resource == nil {
+		logrus.Errorf("Resource creation handler received nil resource")
+	}
+	return nil
+}
--- a/internal/pkg/handler/created-handler.go
+++ b/internal/pkg/handler/created-handler.go
@@ -1,29 +0,0 @@
-package handler
-
-import (
-	"github.com/sirupsen/logrus"
-	"k8s.io/api/core/v1"
-)
-
-// ResourceCreatedHandler contains new objects
-type ResourceCreatedHandler struct {
-	Resource interface{}
-}
-
-// Handle processes the newly created resource
-func (r ResourceCreatedHandler) Handle() error {
-	if r.Resource == nil {
-		logrus.Errorf("Error in Handler")
-	} else {
-		logrus.Infof("Detected changes in object %s", r.Resource)
-		// process resource based on its type
-		if _, ok := r.Resource.(*v1.ConfigMap); ok {
-			logrus.Infof("Performing 'Added' action for resource of type 'configmap'")
-		} else if _, ok := r.Resource.(*v1.Secret); ok {
-			logrus.Infof("Performing 'Added' action for resource of type 'secret'")
-		} else {
-			logrus.Warnf("Invalid resource: Resource should be 'Secret' or 'Configmap' but found %v", r.Resource)
-		}
-	}
-	return nil
-}
--- a/internal/pkg/handler/update.go
+++ b/internal/pkg/handler/update.go
@@ -0,0 +1,186 @@
+package handler
+
+import (
+	"sort"
+	"strings"
+
+	"github.com/sirupsen/logrus"
+	"github.com/stakater/Reloader/internal/pkg/callbacks"
+	"github.com/stakater/Reloader/internal/pkg/constants"
+	"github.com/stakater/Reloader/internal/pkg/crypto"
+	"github.com/stakater/Reloader/internal/pkg/util"
+	"github.com/stakater/Reloader/pkg/kube"
+	"k8s.io/api/core/v1"
+	"k8s.io/client-go/kubernetes"
+)
+
+// ResourceUpdatedHandler contains updated objects
+type ResourceUpdatedHandler struct {
+	Resource    interface{}
+	OldResource interface{}
+}
+
+// Handle processes the updated resource
+func (r ResourceUpdatedHandler) Handle() error {
+	if r.Resource == nil || r.OldResource == nil {
+		logrus.Errorf("Resource update handler received nil resource")
+	} else {
+		config, envVarPostfix, oldSHAData := getConfig(r)
+		if config.SHAValue != oldSHAData {
+			logrus.Infof("Changes detected in %s of type '%s' in namespace: %s", config.ResourceName, envVarPostfix, config.Namespace)
+			// process resource based on its type
+			rollingUpgrade(r, config, envVarPostfix, callbacks.RollingUpgradeFuncs{
+				ItemsFunc:      callbacks.GetDeploymentItems,
+				ContainersFunc: callbacks.GetDeploymentContainers,
+				UpdateFunc:     callbacks.UpdateDeployment,
+				ResourceType:   "Deployment",
+			})
+			rollingUpgrade(r, config, envVarPostfix, callbacks.RollingUpgradeFuncs{
+				ItemsFunc:      callbacks.GetDaemonSetItems,
+				ContainersFunc: callbacks.GetDaemonSetContainers,
+				UpdateFunc:     callbacks.UpdateDaemonSet,
+				ResourceType:   "DaemonSet",
+			})
+			rollingUpgrade(r, config, envVarPostfix, callbacks.RollingUpgradeFuncs{
+				ItemsFunc:      callbacks.GetStatefulSetItems,
+				ContainersFunc: callbacks.GetStatefulsetContainers,
+				UpdateFunc:     callbacks.UpdateStatefulset,
+				ResourceType:   "StatefulSet",
+			})
+		}
+	}
+	return nil
+}
+
+func rollingUpgrade(r ResourceUpdatedHandler, config util.Config, envarPostfix string, upgradeFuncs callbacks.RollingUpgradeFuncs) {
+	client, err := kube.GetClient()
+	if err != nil {
+		logrus.Fatalf("Unable to create Kubernetes client error = %v", err)
+	}
+
+	err = PerformRollingUpgrade(client, config, envarPostfix, upgradeFuncs)
+	if err != nil {
+		logrus.Errorf("Rolling upgrade for %s failed with error = %v", config.ResourceName, err)
+	}
+}
+
+func getConfig(r ResourceUpdatedHandler) (util.Config, string, string) {
+	var oldSHAData, envVarPostfix string
+	var config util.Config
+	if _, ok := r.Resource.(*v1.ConfigMap); ok {
+		oldSHAData = getSHAfromConfigmap(r.OldResource.(*v1.ConfigMap).Data)
+		config = getConfigmapConfig(r)
+		envVarPostfix = constants.ConfigmapEnvVarPostfix
+	} else if _, ok := r.Resource.(*v1.Secret); ok {
+		oldSHAData = getSHAfromSecret(r.OldResource.(*v1.Secret).Data)
+		config = getSecretConfig(r)
+		envVarPostfix = constants.SecretEnvVarPostfix
+	} else {
+		logrus.Warnf("Invalid resource: Resource should be 'Secret' or 'Configmap' but found, %v", r.Resource)
+	}
+	return config, envVarPostfix, oldSHAData
+}
+
+func getConfigmapConfig(r ResourceUpdatedHandler) util.Config {
+	configmap := r.Resource.(*v1.ConfigMap)
+	return util.Config{
+		Namespace:    configmap.Namespace,
+		ResourceName: configmap.Name,
+		Annotation:   constants.ConfigmapUpdateOnChangeAnnotation,
+		SHAValue:     getSHAfromConfigmap(configmap.Data),
+	}
+}
+
+func getSecretConfig(r ResourceUpdatedHandler) util.Config {
+	secret := r.Resource.(*v1.Secret)
+	return util.Config{
+		Namespace:    secret.Namespace,
+		ResourceName: secret.Name,
+		Annotation:   constants.SecretUpdateOnChangeAnnotation,
+		SHAValue:     getSHAfromSecret(secret.Data),
+	}
+}
+
+// PerformRollingUpgrade upgrades the deployment if there is any change in configmap or secret data
+func PerformRollingUpgrade(client kubernetes.Interface, config util.Config, envarPostfix string, upgradeFuncs callbacks.RollingUpgradeFuncs) error {
+	items := upgradeFuncs.ItemsFunc(client, config.Namespace)
+	var err error
+	for _, i := range items {
+		containers := upgradeFuncs.ContainersFunc(i)
+		resourceName := util.ToObjectMeta(i).Name
+		// find correct annotation and update the resource
+		annotationValue := util.ToObjectMeta(i).Annotations[config.Annotation]
+		if annotationValue != "" {
+			values := strings.Split(annotationValue, ",")
+			for _, value := range values {
+				if value == config.ResourceName {
+					updated := updateContainers(containers, value, config.SHAValue, envarPostfix)
+					if !updated {
+						logrus.Warnf("Rolling upgrade failed because no container found to add environment variable in %s of type %s in namespace: %s", resourceName, upgradeFuncs.ResourceType, config.Namespace)
+					} else {
+						err = upgradeFuncs.UpdateFunc(client, config.Namespace, i)
+						if err != nil {
+							logrus.Errorf("Update for %s of type %s in namespace %s failed with error %v", resourceName, upgradeFuncs.ResourceType, config.Namespace, err)
+						} else {
+							logrus.Infof("Updated %s of type %s in namespace: %s ", resourceName, upgradeFuncs.ResourceType, config.Namespace)
+						}
+						break
+					}
+				}
+			}
+		}
+	}
+	return err
+}
+
+func updateContainers(containers []v1.Container, annotationValue string, shaData string, envarPostfix string) bool {
+	updated := false
+	envar := constants.EnvVarPrefix + util.ConvertToEnvVarName(annotationValue)+ "_" + envarPostfix
+	for i := range containers {
+		envs := containers[i].Env
+
+		//update if env var exists
+		updated = updateEnvVar(envs, envar, shaData)
+
+		// if no existing env var exists lets create one
+		if !updated {
+			e := v1.EnvVar{
+				Name:  envar,
+				Value: shaData,
+			}
+			containers[i].Env = append(containers[i].Env, e)
+			updated = true
+		}
+	}
+	return updated
+}
+
+func updateEnvVar(envs []v1.EnvVar, envar string, shaData string) bool {
+	for j := range envs {
+		if envs[j].Name == envar {
+			if envs[j].Value != shaData {
+				envs[j].Value = shaData
+				return true
+			}
+		}
+	}
+	return false
+}
+
+func getSHAfromConfigmap(data map[string]string) string {
+	values := []string{}
+	for k, v := range data {
+		values = append(values, k+"="+v)
+	}
+	sort.Strings(values)
+	return crypto.GenerateSHA(strings.Join(values, ";"))
+}
+
+func getSHAfromSecret(data map[string][]byte) string {
+	values := []string{}
+	for k, v := range data {
+		values = append(values, k+"="+string(v[:]))
+	}
+	sort.Strings(values)
+	return crypto.GenerateSHA(strings.Join(values, ";"))
+}
--- a/internal/pkg/handler/update_test.go
+++ b/internal/pkg/handler/update_test.go
@@ -0,0 +1,315 @@
+package handler
+
+import (
+	"os"
+	"testing"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"github.com/stakater/Reloader/internal/pkg/callbacks"
+	"github.com/stakater/Reloader/internal/pkg/constants"
+	"github.com/stakater/Reloader/internal/pkg/testutil"
+	"github.com/stakater/Reloader/internal/pkg/util"
+	testclient "k8s.io/client-go/kubernetes/fake"
+)
+
+var (
+	client        = testclient.NewSimpleClientset()
+	namespace     = "test-handler-" + testutil.RandSeq(5)
+	configmapName = "testconfigmap-handler-" + testutil.RandSeq(5)
+	secretName    = "testsecret-handler-" + testutil.RandSeq(5)
+)
+
+func TestMain(m *testing.M) {
+
+	// Creating namespace
+	testutil.CreateNamespace(namespace, client)
+
+	logrus.Infof("Setting up the test resources")
+	setup()
+
+	logrus.Infof("Running Testcases")
+	retCode := m.Run()
+
+	logrus.Infof("tearing down the test resources")
+	teardown()
+
+	os.Exit(retCode)
+}
+
+func setup() {
+	// Creating configmap
+	_, err := testutil.CreateConfigMap(client, namespace, configmapName, "www.google.com")
+	if err != nil {
+		logrus.Errorf("Error in configmap creation: %v", err)
+	}
+
+	// Creating secret
+	data := "dGVzdFNlY3JldEVuY29kaW5nRm9yUmVsb2FkZXI="
+	_, err = testutil.CreateSecret(client, namespace, secretName, data)
+	if err != nil {
+		logrus.Errorf("Error in secret creation: %v", err)
+	}
+
+	// Creating Deployment with configmap
+	_, err = testutil.CreateDeployment(client, configmapName, namespace)
+	if err != nil {
+		logrus.Errorf("Error in Deployment with configmap creation: %v", err)
+	}
+
+	// Creating Deployment with secret
+	_, err = testutil.CreateDeployment(client, secretName, namespace)
+	if err != nil {
+		logrus.Errorf("Error in Deployment with secret creation: %v", err)
+	}
+
+	// Creating DaemonSet with configmap
+	_, err = testutil.CreateDaemonSet(client, configmapName, namespace)
+	if err != nil {
+		logrus.Errorf("Error in DaemonSet with configmap creation: %v", err)
+	}
+
+	// Creating DaemonSet with secret
+	_, err = testutil.CreateDaemonSet(client, secretName, namespace)
+	if err != nil {
+		logrus.Errorf("Error in DaemonSet with secret creation: %v", err)
+	}
+
+	// Creating StatefulSet with configmap
+	_, err = testutil.CreateStatefulSet(client, configmapName, namespace)
+	if err != nil {
+		logrus.Errorf("Error in StatefulSet with configmap creation: %v", err)
+	}
+
+	// Creating StatefulSet with secret
+	_, err = testutil.CreateStatefulSet(client, secretName, namespace)
+	if err != nil {
+		logrus.Errorf("Error in StatefulSet with secret creation: %v", err)
+	}
+
+}
+
+func teardown() {
+	// Deleting Deployment with configmap
+	deploymentError := testutil.DeleteDeployment(client, namespace, configmapName)
+	if deploymentError != nil {
+		logrus.Errorf("Error while deleting deployment with configmap %v", deploymentError)
+	}
+
+	// Deleting Deployment with secret
+	deploymentError = testutil.DeleteDeployment(client, namespace, secretName)
+	if deploymentError != nil {
+		logrus.Errorf("Error while deleting deployment with secret %v", deploymentError)
+	}
+
+	// Deleting DaemonSet with configmap
+	daemonSetError := testutil.DeleteDaemonSet(client, namespace, configmapName)
+	if daemonSetError != nil {
+		logrus.Errorf("Error while deleting daemonSet with configmap %v", daemonSetError)
+	}
+
+	// Deleting Deployment with secret
+	daemonSetError = testutil.DeleteDaemonSet(client, namespace, secretName)
+	if daemonSetError != nil {
+		logrus.Errorf("Error while deleting daemonSet with secret %v", daemonSetError)
+	}
+
+	// Deleting StatefulSet with configmap
+	statefulSetError := testutil.DeleteStatefulSet(client, namespace, configmapName)
+	if statefulSetError != nil {
+		logrus.Errorf("Error while deleting statefulSet with configmap %v", statefulSetError)
+	}
+
+	// Deleting Deployment with secret
+	statefulSetError = testutil.DeleteStatefulSet(client, namespace, secretName)
+	if statefulSetError != nil {
+		logrus.Errorf("Error while deleting statefulSet with secret %v", statefulSetError)
+	}
+
+	// Deleting Configmap
+	err := testutil.DeleteConfigMap(client, namespace, configmapName)
+	if err != nil {
+		logrus.Errorf("Error while deleting the configmap %v", err)
+	}
+
+	// Deleting Secret
+	err = testutil.DeleteSecret(client, namespace, secretName)
+	if err != nil {
+		logrus.Errorf("Error while deleting the secret %v", err)
+	}
+
+	// Deleting namespace
+	testutil.DeleteNamespace(namespace, client)
+
+}
+
+func TestRollingUpgradeForDeploymentWithConfigmap(t *testing.T) {
+	shaData := testutil.ConvertResourceToSHA(testutil.SecretResourceType, namespace, configmapName, "www.stakater.com")
+	config := util.Config{
+		Namespace:    namespace,
+		ResourceName: configmapName,
+		SHAValue:     shaData,
+		Annotation:   constants.ConfigmapUpdateOnChangeAnnotation,
+	}
+	deploymentFuncs := callbacks.RollingUpgradeFuncs{
+		ItemsFunc:      callbacks.GetDeploymentItems,
+		ContainersFunc: callbacks.GetDeploymentContainers,
+		UpdateFunc:     callbacks.UpdateDeployment,
+		ResourceType:   "Deployment",
+	}
+
+	err := PerformRollingUpgrade(client, config, constants.ConfigmapEnvVarPostfix, deploymentFuncs)
+	time.Sleep(5 * time.Second)
+	if err != nil {
+		t.Errorf("Rolling upgrade failed for Deployment with Configmap")
+	}
+
+	logrus.Infof("Verifying deployment update")
+	updated := testutil.VerifyResourceUpdate(client, config, constants.ConfigmapEnvVarPostfix, deploymentFuncs)
+	if !updated {
+		t.Errorf("Deployment was not updated")
+	}
+}
+
+func TestRollingUpgradeForDeploymentWithSecret(t *testing.T) {
+	shaData := testutil.ConvertResourceToSHA(testutil.SecretResourceType, namespace, secretName, "dGVzdFVwZGF0ZWRTZWNyZXRFbmNvZGluZ0ZvclJlbG9hZGVy")
+	config := util.Config{
+		Namespace:    namespace,
+		ResourceName: secretName,
+		SHAValue:     shaData,
+		Annotation:   constants.SecretUpdateOnChangeAnnotation,
+	}
+	deploymentFuncs := callbacks.RollingUpgradeFuncs{
+		ItemsFunc:      callbacks.GetDeploymentItems,
+		ContainersFunc: callbacks.GetDeploymentContainers,
+		UpdateFunc:     callbacks.UpdateDeployment,
+		ResourceType:   "Deployment",
+	}
+
+	err := PerformRollingUpgrade(client, config, constants.SecretEnvVarPostfix, deploymentFuncs)
+	time.Sleep(5 * time.Second)
+	if err != nil {
+		t.Errorf("Rolling upgrade failed for Deployment with Secret")
+	}
+
+	logrus.Infof("Verifying deployment update")
+	updated := testutil.VerifyResourceUpdate(client, config, constants.SecretEnvVarPostfix, deploymentFuncs)
+	if !updated {
+		t.Errorf("Deployment was not updated")
+	}
+}
+
+func TestRollingUpgradeForDaemonSetWithConfigmap(t *testing.T) {
+	shaData := testutil.ConvertResourceToSHA(testutil.ConfigmapResourceType, namespace, configmapName, "www.facebook.com")
+	config := util.Config{
+		Namespace:    namespace,
+		ResourceName: configmapName,
+		SHAValue:     shaData,
+		Annotation:   constants.ConfigmapUpdateOnChangeAnnotation,
+	}
+	daemonSetFuncs := callbacks.RollingUpgradeFuncs{
+		ItemsFunc:      callbacks.GetDaemonSetItems,
+		ContainersFunc: callbacks.GetDaemonSetContainers,
+		UpdateFunc:     callbacks.UpdateDaemonSet,
+		ResourceType:   "DaemonSet",
+	}
+
+	err := PerformRollingUpgrade(client, config, constants.ConfigmapEnvVarPostfix, daemonSetFuncs)
+	time.Sleep(5 * time.Second)
+	if err != nil {
+		t.Errorf("Rolling upgrade failed for DaemonSet with configmap")
+	}
+
+	logrus.Infof("Verifying daemonSet update")
+	updated := testutil.VerifyResourceUpdate(client, config, constants.ConfigmapEnvVarPostfix, daemonSetFuncs)
+	if !updated {
+		t.Errorf("DaemonSet was not updated")
+	}
+}
+
+func TestRollingUpgradeForDaemonSetWithSecret(t *testing.T) {
+	shaData := testutil.ConvertResourceToSHA(testutil.SecretResourceType, namespace, secretName, "d3d3LmZhY2Vib29rLmNvbQ==")
+
+	config := util.Config{
+		Namespace:    namespace,
+		ResourceName: secretName,
+		SHAValue:     shaData,
+		Annotation:   constants.SecretUpdateOnChangeAnnotation,
+	}
+	daemonSetFuncs := callbacks.RollingUpgradeFuncs{
+		ItemsFunc:      callbacks.GetDaemonSetItems,
+		ContainersFunc: callbacks.GetDaemonSetContainers,
+		UpdateFunc:     callbacks.UpdateDaemonSet,
+		ResourceType:   "DaemonSet",
+	}
+
+	err := PerformRollingUpgrade(client, config, constants.SecretEnvVarPostfix, daemonSetFuncs)
+	time.Sleep(5 * time.Second)
+	if err != nil {
+		t.Errorf("Rolling upgrade failed for DaemonSet with secret")
+	}
+
+	logrus.Infof("Verifying daemonSet update")
+	updated := testutil.VerifyResourceUpdate(client, config, constants.SecretEnvVarPostfix, daemonSetFuncs)
+	if !updated {
+		t.Errorf("DaemonSet was not updated")
+	}
+}
+
+func TestRollingUpgradeForStatefulSetWithConfigmap(t *testing.T) {
+	shaData := testutil.ConvertResourceToSHA(testutil.ConfigmapResourceType, namespace, configmapName, "www.twitter.com")
+
+	config := util.Config{
+		Namespace:    namespace,
+		ResourceName: configmapName,
+		SHAValue:     shaData,
+		Annotation:   constants.ConfigmapUpdateOnChangeAnnotation,
+	}
+	statefulSetFuncs := callbacks.RollingUpgradeFuncs{
+		ItemsFunc:      callbacks.GetStatefulSetItems,
+		ContainersFunc: callbacks.GetStatefulsetContainers,
+		UpdateFunc:     callbacks.UpdateStatefulset,
+		ResourceType:   "StatefulSet",
+	}
+
+	err := PerformRollingUpgrade(client, config, constants.ConfigmapEnvVarPostfix, statefulSetFuncs)
+	time.Sleep(5 * time.Second)
+	if err != nil {
+		t.Errorf("Rolling upgrade failed for StatefulSet with configmap")
+	}
+
+	logrus.Infof("Verifying statefulSet update")
+	updated := testutil.VerifyResourceUpdate(client, config, constants.ConfigmapEnvVarPostfix, statefulSetFuncs)
+	if !updated {
+		t.Errorf("StatefulSet was not updated")
+	}
+}
+
+func TestRollingUpgradeForStatefulSetWithSecret(t *testing.T) {
+	shaData := testutil.ConvertResourceToSHA(testutil.SecretResourceType, namespace, secretName, "d3d3LnR3aXR0ZXIuY29t")
+
+	config := util.Config{
+		Namespace:    namespace,
+		ResourceName: secretName,
+		SHAValue:     shaData,
+		Annotation:   constants.SecretUpdateOnChangeAnnotation,
+	}
+	statefulSetFuncs := callbacks.RollingUpgradeFuncs{
+		ItemsFunc:      callbacks.GetStatefulSetItems,
+		ContainersFunc: callbacks.GetStatefulsetContainers,
+		UpdateFunc:     callbacks.UpdateStatefulset,
+		ResourceType:   "StatefulSet",
+	}
+
+	err := PerformRollingUpgrade(client, config, constants.SecretEnvVarPostfix, statefulSetFuncs)
+	time.Sleep(5 * time.Second)
+	if err != nil {
+		t.Errorf("Rolling upgrade failed for StatefulSet with secret")
+	}
+
+	logrus.Infof("Verifying statefulSet update")
+	updated := testutil.VerifyResourceUpdate(client, config, constants.SecretEnvVarPostfix, statefulSetFuncs)
+	if !updated {
+		t.Errorf("StatefulSet was not updated")
+	}
+}
--- a/internal/pkg/handler/updated-handler.go
+++ b/internal/pkg/handler/updated-handler.go
@@ -1,30 +0,0 @@
-package handler
-
-import (
-	"github.com/sirupsen/logrus"
-	"k8s.io/api/core/v1"
-)
-
-// ResourceUpdatedHandler contains updated objects
-type ResourceUpdatedHandler struct {
-	Resource    interface{}
-	OldResource interface{}
-}
-
-// Handle processes the updated resource
-func (r ResourceUpdatedHandler) Handle() error {
-	if r.Resource == nil || r.OldResource == nil {
-		logrus.Errorf("Error in Handler")
-	} else {
-		logrus.Infof("Detected changes in object %s", r.Resource)
-		// process resource based on its type
-		if _, ok := r.Resource.(*v1.ConfigMap); ok {
-			logrus.Infof("Performing 'Updated' action for resource of type 'configmap'")
-		} else if _, ok := r.Resource.(*v1.Secret); ok {
-			logrus.Infof("Performing 'Updated' action for resource of type 'secret'")
-		} else {
-			logrus.Warnf("Invalid resource: Resource should be 'Secret' or 'Configmap' but found %v", r.Resource)
-		}
-	}
-	return nil
-}
--- a/internal/pkg/testutil/kube.go
+++ b/internal/pkg/testutil/kube.go
@@ -0,0 +1,403 @@
+package testutil
+
+import (
+	"math/rand"
+	"sort"
+	"strings"
+	"time"
+
+	"github.com/sirupsen/logrus"
+	"github.com/stakater/Reloader/internal/pkg/callbacks"
+	"github.com/stakater/Reloader/internal/pkg/constants"
+	"github.com/stakater/Reloader/internal/pkg/crypto"
+	"github.com/stakater/Reloader/internal/pkg/util"
+	"github.com/stakater/Reloader/pkg/kube"
+	v1_beta1 "k8s.io/api/apps/v1beta1"
+	"k8s.io/api/core/v1"
+	"k8s.io/api/extensions/v1beta1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/client-go/kubernetes"
+	core_v1 "k8s.io/client-go/kubernetes/typed/core/v1"
+)
+
+var (
+	letters = []rune("abcdefghijklmnopqrstuvwxyz")
+	// ConfigmapResourceType is a resource type which controller watches for changes
+	ConfigmapResourceType = "configMaps"
+	// SecretResourceType is a resource type which controller watches for changes
+	SecretResourceType = "secrets"
+)
+
+func GetClient() *kubernetes.Clientset {
+	newClient, err := kube.GetClient()
+	if err != nil {
+		logrus.Fatalf("Unable to create Kubernetes client error = %v", err)
+	}
+	return newClient
+}
+
+// CreateNamespace creates namespace for testing
+func CreateNamespace(namespace string, client kubernetes.Interface) {
+	_, err := client.CoreV1().Namespaces().Create(&v1.Namespace{ObjectMeta: metav1.ObjectMeta{Name: namespace}})
+	if err != nil {
+		logrus.Fatalf("Failed to create namespace for testing", err)
+	} else {
+		logrus.Infof("Creating namespace for testing = %s", namespace)
+	}
+}
+
+// DeleteNamespace deletes namespace for testing
+func DeleteNamespace(namespace string, client kubernetes.Interface) {
+	err := client.CoreV1().Namespaces().Delete(namespace, &metav1.DeleteOptions{})
+	if err != nil {
+		logrus.Fatalf("Failed to delete namespace that was created for testing", err)
+	} else {
+		logrus.Infof("Deleting namespace for testing = %s", namespace)
+	}
+}
+
+// GetDeployment provides deployment for testing
+func GetDeployment(namespace string, deploymentName string) *v1beta1.Deployment {
+	replicaset := int32(1)
+	return &v1beta1.Deployment{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      deploymentName,
+			Namespace: namespace,
+			Labels:    map[string]string{"firstLabel": "temp"},
+			Annotations: map[string]string{
+				constants.ConfigmapUpdateOnChangeAnnotation: deploymentName,
+				constants.SecretUpdateOnChangeAnnotation:    deploymentName},
+		},
+		Spec: v1beta1.DeploymentSpec{
+			Replicas: &replicaset,
+			Strategy: v1beta1.DeploymentStrategy{
+				Type: v1beta1.RollingUpdateDeploymentStrategyType,
+			},
+			Template: v1.PodTemplateSpec{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: map[string]string{"secondLabel": "temp"},
+				},
+				Spec: v1.PodSpec{
+					Containers: []v1.Container{
+						{
+							Image: "tutum/hello-world",
+							Name:  deploymentName,
+							Env: []v1.EnvVar{
+								{
+									Name:  "BUCKET_NAME",
+									Value: "test",
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+// GetDaemonSet provides daemonset for testing
+func GetDaemonSet(namespace string, daemonsetName string) *v1beta1.DaemonSet {
+	return &v1beta1.DaemonSet{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      daemonsetName,
+			Namespace: namespace,
+			Labels:    map[string]string{"firstLabel": "temp"},
+			Annotations: map[string]string{
+				constants.ConfigmapUpdateOnChangeAnnotation: daemonsetName,
+				constants.SecretUpdateOnChangeAnnotation:    daemonsetName},
+		},
+		Spec: v1beta1.DaemonSetSpec{
+			UpdateStrategy: v1beta1.DaemonSetUpdateStrategy{
+				Type: v1beta1.RollingUpdateDaemonSetStrategyType,
+			},
+			Template: v1.PodTemplateSpec{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: map[string]string{"secondLabel": "temp"},
+				},
+				Spec: v1.PodSpec{
+					Containers: []v1.Container{
+						{
+							Image: "tutum/hello-world",
+							Name:  daemonsetName,
+							Env: []v1.EnvVar{
+								{
+									Name:  "BUCKET_NAME",
+									Value: "test",
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+// GetStatefulSet provides statefulset for testing
+func GetStatefulSet(namespace string, statefulsetName string) *v1_beta1.StatefulSet {
+	return &v1_beta1.StatefulSet{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      statefulsetName,
+			Namespace: namespace,
+			Labels:    map[string]string{"firstLabel": "temp"},
+			Annotations: map[string]string{
+				constants.ConfigmapUpdateOnChangeAnnotation: statefulsetName,
+				constants.SecretUpdateOnChangeAnnotation:    statefulsetName},
+		},
+		Spec: v1_beta1.StatefulSetSpec{
+			UpdateStrategy: v1_beta1.StatefulSetUpdateStrategy{
+				Type: v1_beta1.RollingUpdateStatefulSetStrategyType,
+			},
+			Template: v1.PodTemplateSpec{
+				ObjectMeta: metav1.ObjectMeta{
+					Labels: map[string]string{"secondLabel": "temp"},
+				},
+				Spec: v1.PodSpec{
+					Containers: []v1.Container{
+						{
+							Image: "tutum/hello-world",
+							Name:  statefulsetName,
+							Env: []v1.EnvVar{
+								{
+									Name:  "BUCKET_NAME",
+									Value: "test",
+								},
+							},
+						},
+					},
+				},
+			},
+		},
+	}
+}
+
+// GetConfigmap provides configmap for testing
+func GetConfigmap(namespace string, configmapName string, testData string) *v1.ConfigMap {
+	return &v1.ConfigMap{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      configmapName,
+			Namespace: namespace,
+			Labels:    map[string]string{"firstLabel": "temp"},
+		},
+		Data: map[string]string{"test.url": testData},
+	}
+}
+
+// GetConfigmapWithUpdatedLabel provides configmap for testing
+func GetConfigmapWithUpdatedLabel(namespace string, configmapName string, testLabel string, testData string) *v1.ConfigMap {
+	return &v1.ConfigMap{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      configmapName,
+			Namespace: namespace,
+			Labels:    map[string]string{"firstLabel": testLabel},
+		},
+		Data: map[string]string{"test.url": testData},
+	}
+}
+
+// GetSecret provides secret for testing
+func GetSecret(namespace string, secretName string, data string) *v1.Secret {
+	return &v1.Secret{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      secretName,
+			Namespace: namespace,
+			Labels:    map[string]string{"firstLabel": "temp"},
+		},
+		Data: map[string][]byte{"test.url": []byte(data)},
+	}
+}
+
+// GetSecretWithUpdatedLabel provides secret for testing
+func GetSecretWithUpdatedLabel(namespace string, secretName string, label string, data string) *v1.Secret {
+	return &v1.Secret{
+		ObjectMeta: metav1.ObjectMeta{
+			Name:      secretName,
+			Namespace: namespace,
+			Labels:    map[string]string{"firstLabel": label},
+		},
+		Data: map[string][]byte{"test.url": []byte(data)},
+	}
+}
+
+// GetResourceSHA returns the SHA value of given environment variable
+func GetResourceSHA(containers []v1.Container, envar string) string {
+	for i := range containers {
+		envs := containers[i].Env
+		for j := range envs {
+			if envs[j].Name == envar {
+				return envs[j].Value
+			}
+		}
+	}
+	return ""
+}
+
+//ConvertResourceToSHA generates SHA from secret or configmap data
+func ConvertResourceToSHA(resourceType string, namespace string, resourceName string, data string) string {
+	values := []string{}
+	if resourceType == SecretResourceType {
+		secret := GetSecret(namespace, resourceName, data)
+		for k, v := range secret.Data {
+			values = append(values, k+"="+string(v[:]))
+		}
+	} else if resourceType == ConfigmapResourceType {
+		configmap := GetConfigmap(namespace, resourceName, data)
+		for k, v := range configmap.Data {
+			values = append(values, k+"="+v)
+		}
+	}
+	sort.Strings(values)
+	return crypto.GenerateSHA(strings.Join(values, ";"))
+}
+
+// CreateConfigMap creates a configmap in given namespace and returns the ConfigMapInterface
+func CreateConfigMap(client kubernetes.Interface, namespace string, configmapName string, data string) (core_v1.ConfigMapInterface, error) {
+	logrus.Infof("Creating configmap")
+	configmapClient := client.CoreV1().ConfigMaps(namespace)
+	_, err := configmapClient.Create(GetConfigmap(namespace, configmapName, data))
+	time.Sleep(10 * time.Second)
+	return configmapClient, err
+}
+
+// CreateSecret creates a secret in given namespace and returns the SecretInterface
+func CreateSecret(client kubernetes.Interface, namespace string, secretName string, data string) (core_v1.SecretInterface, error) {
+	logrus.Infof("Creating secret")
+	secretClient := client.CoreV1().Secrets(namespace)
+	_, err := secretClient.Create(GetSecret(namespace, secretName, data))
+	time.Sleep(10 * time.Second)
+	return secretClient, err
+}
+
+// CreateDeployment creates a deployment in given namespace and returns the Deployment
+func CreateDeployment(client kubernetes.Interface, deploymentName string, namespace string) (*v1beta1.Deployment, error) {
+	logrus.Infof("Creating Deployment")
+	deploymentClient := client.ExtensionsV1beta1().Deployments(namespace)
+	deployment, err := deploymentClient.Create(GetDeployment(namespace, deploymentName))
+	time.Sleep(10 * time.Second)
+	return deployment, err
+}
+
+// CreateDaemonSet creates a deployment in given namespace and returns the DaemonSet
+func CreateDaemonSet(client kubernetes.Interface, daemonsetName string, namespace string) (*v1beta1.DaemonSet, error) {
+	logrus.Infof("Creating DaemonSet")
+	daemonsetClient := client.ExtensionsV1beta1().DaemonSets(namespace)
+	daemonset, err := daemonsetClient.Create(GetDaemonSet(namespace, daemonsetName))
+	time.Sleep(10 * time.Second)
+	return daemonset, err
+}
+
+// CreateStatefulSet creates a deployment in given namespace and returns the StatefulSet
+func CreateStatefulSet(client kubernetes.Interface, statefulsetName string, namespace string) (*v1_beta1.StatefulSet, error) {
+	logrus.Infof("Creating StatefulSet")
+	statefulsetClient := client.AppsV1beta1().StatefulSets(namespace)
+	statefulset, err := statefulsetClient.Create(GetStatefulSet(namespace, statefulsetName))
+	time.Sleep(10 * time.Second)
+	return statefulset, err
+}
+
+// DeleteDeployment creates a deployment in given namespace and returns the error if any
+func DeleteDeployment(client kubernetes.Interface, namespace string, deploymentName string) error {
+	logrus.Infof("Deleting Deployment")
+	deploymentError := client.ExtensionsV1beta1().Deployments(namespace).Delete(deploymentName, &metav1.DeleteOptions{})
+	time.Sleep(10 * time.Second)
+	return deploymentError
+}
+
+// DeleteDaemonSet creates a daemonset in given namespace and returns the error if any
+func DeleteDaemonSet(client kubernetes.Interface, namespace string, daemonsetName string) error {
+	logrus.Infof("Deleting DaemonSet %s", daemonsetName)
+	daemonsetError := client.ExtensionsV1beta1().DaemonSets(namespace).Delete(daemonsetName, &metav1.DeleteOptions{})
+	time.Sleep(10 * time.Second)
+	return daemonsetError
+}
+
+// DeleteStatefulSet creates a statefulset in given namespace and returns the error if any
+func DeleteStatefulSet(client kubernetes.Interface, namespace string, statefulsetName string) error {
+	logrus.Infof("Deleting StatefulSet %s", statefulsetName)
+	statefulsetError := client.AppsV1beta1().StatefulSets(namespace).Delete(statefulsetName, &metav1.DeleteOptions{})
+	time.Sleep(10 * time.Second)
+	return statefulsetError
+}
+
+// UpdateConfigMap updates a configmap in given namespace and returns the error if any
+func UpdateConfigMap(configmapClient core_v1.ConfigMapInterface, namespace string, configmapName string, label string, data string) error {
+	logrus.Infof("Updating configmap %q.\n", configmapName)
+	var configmap *v1.ConfigMap
+	if label != "" {
+		configmap = GetConfigmapWithUpdatedLabel(namespace, configmapName, label, data)
+	} else {
+		configmap = GetConfigmap(namespace, configmapName, data)
+	}
+	_, updateErr := configmapClient.Update(configmap)
+	time.Sleep(10 * time.Second)
+	return updateErr
+}
+
+// UpdateSecret updates a secret in given namespace and returns the error if any
+func UpdateSecret(secretClient core_v1.SecretInterface, namespace string, secretName string, label string, data string) error {
+	logrus.Infof("Updating secret %q.\n", secretName)
+	var secret *v1.Secret
+	if label != "" {
+		secret = GetSecretWithUpdatedLabel(namespace, secretName, label, data)
+	} else {
+		secret = GetSecret(namespace, secretName, data)
+	}
+	_, updateErr := secretClient.Update(secret)
+	time.Sleep(10 * time.Second)
+	return updateErr
+}
+
+// DeleteConfigMap deletes a configmap in given namespace and returns the error if any
+func DeleteConfigMap(client kubernetes.Interface, namespace string, configmapName string) error {
+	logrus.Infof("Deleting configmap %q.\n", configmapName)
+	err := client.CoreV1().ConfigMaps(namespace).Delete(configmapName, &metav1.DeleteOptions{})
+	time.Sleep(10 * time.Second)
+	return err
+}
+
+// DeleteSecret deletes a secret in given namespace and returns the error if any
+func DeleteSecret(client kubernetes.Interface, namespace string, secretName string) error {
+	logrus.Infof("Deleting secret %q.\n", secretName)
+	err := client.CoreV1().Secrets(namespace).Delete(secretName, &metav1.DeleteOptions{})
+	time.Sleep(10 * time.Second)
+	return err
+}
+
+// RandSeq generates a random sequence
+func RandSeq(n int) string {
+	rand.Seed(time.Now().UnixNano())
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+	return string(b)
+}
+
+func VerifyResourceUpdate(client kubernetes.Interface, config util.Config, envVarPostfix string, upgradeFuncs callbacks.RollingUpgradeFuncs) bool {
+	items := upgradeFuncs.ItemsFunc(client, config.Namespace)
+	for _, i := range items {
+		containers := upgradeFuncs.ContainersFunc(i)
+		// match statefulsets with the correct annotation
+		annotationValue := util.ToObjectMeta(i).Annotations[config.Annotation]
+		if annotationValue != "" {
+			values := strings.Split(annotationValue, ",")
+			matches := false
+			for _, value := range values {
+				if value == config.ResourceName {
+					matches = true
+					break
+				}
+			}
+			if matches {
+				envName := constants.EnvVarPrefix + util.ConvertToEnvVarName(annotationValue) + "_" + envVarPostfix
+				updated := GetResourceSHA(containers, envName)
+
+				if updated == config.SHAValue {
+					return true
+				}
+			}
+		}
+	}
+	return false
+}
--- a/internal/pkg/util/config.go
+++ b/internal/pkg/util/config.go
@@ -0,0 +1,9 @@
+package util
+
+//Config contains rolling upgrade configuration parameters
+type Config struct {
+	Namespace    string
+	ResourceName string
+	Annotation   string
+	SHAValue     string
+}
--- a/internal/pkg/util/interface.go
+++ b/internal/pkg/util/interface.go
@@ -0,0 +1,38 @@
+package util
+
+import (
+	"reflect"
+
+	"github.com/sirupsen/logrus"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+)
+
+// InterfaceSlice converts an interface to an interface array
+func InterfaceSlice(slice interface{}) []interface{} {
+	s := reflect.ValueOf(slice)
+	if s.Kind() != reflect.Slice {
+		logrus.Errorf("InterfaceSlice() given a non-slice type")
+	}
+
+	ret := make([]interface{}, s.Len())
+
+	for i := 0; i < s.Len(); i++ {
+		ret[i] = s.Index(i).Interface()
+	}
+
+	return ret
+}
+
+type ObjectMeta struct {
+	metav1.ObjectMeta
+}
+
+func ToObjectMeta(kubernetesObject interface{}) ObjectMeta {
+	objectValue := reflect.ValueOf(kubernetesObject)
+	fieldName := reflect.TypeOf((*metav1.ObjectMeta)(nil)).Elem().Name()
+	field := objectValue.FieldByName(fieldName).Interface().(metav1.ObjectMeta)
+
+	return ObjectMeta{
+		ObjectMeta: field,
+	}
+}
--- a/internal/pkg/util/util.go
+++ b/internal/pkg/util/util.go
@@ -0,0 +1,27 @@
+package util
+
+import (
+	"bytes"
+	"strings"
+)
+
+// ConvertToEnvVarName converts the given text into a usable env var
+// removing any special chars with '_' and transforming text to upper case
+func ConvertToEnvVarName(text string) string {
+	var buffer bytes.Buffer
+	upper := strings.ToUpper(text)
+	lastCharValid := false
+	for i := 0; i < len(upper); i++ {
+		ch := upper[i]
+		if (ch >= 'A' && ch <= 'Z') || (ch >= '0' && ch <= '9') {
+			buffer.WriteString(string(ch))
+			lastCharValid = true
+		} else {
+			if lastCharValid {
+				buffer.WriteString("_")
+			}
+			lastCharValid = false
+		}
+	}
+	return buffer.String()
+}
--- a/internal/pkg/util/util_test.go
+++ b/internal/pkg/util/util_test.go
@@ -0,0 +1,13 @@
+package util
+
+import (
+	"testing"
+)
+
+func TestConvertToEnvVarName(t *testing.T) {
+	data := "www.stakater.com"
+	envVar := ConvertToEnvVarName(data)
+	if envVar != "WWW_STAKATER_COM" {
+		t.Errorf("Failed to convert data into environment variable")
+	}
+}
Author	SHA1	Message	Date
stakater-user	291f25fd0e	Bump Version to 0.0.16	2018-10-01 12:30:26 +00:00
Ali Kahoot	19d5704bf9	Merge pull request #28 from stakater/update-library-version Update library version	2018-10-01 17:04:07 +05:00
Waseem Hassan	d24b112150	Update library version	2018-10-01 17:02:48 +05:00
Ali Kahoot	c5e00d7614	Merge pull request #27 from stakater/update-library-version Update Jenkinsfile	2018-10-01 16:42:02 +05:00
Waseem Hassan	4779ef93c8	Update Jenkinsfile	2018-10-01 16:40:47 +05:00
Ahmad Iqbal Ali	b73f14aef9	add logo (#25 )	2018-08-16 11:44:56 +05:00
stakater-user	67012d9544	Bump Version to 0.0.15	2018-08-10 10:24:31 +00:00
Waseem Hassan	f36c3e4dbb	Merge pull request #23 from stakater/lean-readme cleanup readme	2018-08-10 15:02:26 +05:00
faizanahmad055	b7ac8b8f07	Fix typo	2018-08-10 14:14:16 +05:00
faizanahmad055	9bef611a1a	Add flags and add license	2018-08-10 14:11:55 +05:00
stakater-user	ea62b0036c	Bump Version to 0.0.14	2018-08-10 08:18:14 +00:00
Faizan Ahmad	decb9b06be	Merge pull request #24 from stakater/fix-reloader-vs-configmapcontroller fix Reloader vs ConfigmapController doc	2018-08-10 12:56:26 +05:00
faizanahmad055	94bd7bb694	Fix reloader vs configmapcontroller layout	2018-08-10 12:53:53 +05:00
stakater-user	67843f839a	Bump Version to 0.0.13	2018-08-10 06:15:54 +00:00
Rasheed Amir	342395cd84	fix Reloader vs ConfigmapController doc improve the doc quality	2018-08-10 08:05:12 +02:00
Rasheed Amir	695c5b05d2	create a feature docs for seo purposes (#22 ) this doc will/might help users to find this git repo and use it	2018-08-10 07:53:38 +02:00
Rasheed Amir	163aede486	cleanup readme - add acknowledgements section - configmap or secret name doesn't need to be same as deployment name	2018-08-10 07:53:14 +02:00
stakater-user	4d6da476ee	Bump Version to 0.0.12	2018-08-10 00:34:51 +00:00
Ahmad Iqbal Ali	d5ea5d810d	add docs link in README (#21 )	2018-08-10 05:13:30 +05:00
stakater-user	0d10b35d3a	Bump Version to 0.0.11	2018-08-03 21:38:04 +00:00
Rasheed Amir	807e0c0c1b	cleanup the readme	2018-08-03 23:16:33 +02:00
stakater-user	052bbb23e5	Bump Version to 0.0.10	2018-08-02 10:27:58 +00:00
Ahmad Iqbal Ali	28fb50598c	use generic slack details (#18 ) since we don't have a reloader channel at the moment.	2018-08-02 12:05:53 +02:00
stakater-user	a3e4c3a4d7	Bump Version to 0.0.9	2018-08-02 09:39:08 +00:00
Faizan Ahmad	d3bae0d3bb	Optimize logging in reloader (#19 ) * Optimize logging in reloader * Fix test case failing issue * Implement PR-19 review comments * Place the log out of loop * Fix change detection log	2018-08-02 11:17:35 +02:00
stakater-user	64d12a7c31	Bump Version to 0.0.8	2018-08-01 19:11:12 +00:00
Faizan Ahmad	078fc034d2	Add doc how to verify reloader working (#20 ) * Add doc how to verify reloader working * fix the text	2018-08-01 20:49:43 +02:00
stakater-user	a3125e876c	Bump Version to 0.0.7	2018-08-01 10:27:17 +00:00
Faizan Ahmad	2f56d5c05b	Move How it works section from readme to How it works doc (#15 )	2018-08-01 11:58:39 +02:00
Faizan Ahmad	003eaee887	[STK-322] Add reloader vs k8s-trigger-controller doc (#13 ) * Add reloader vs k8s-trigger-controller doc * Fix kubectl command in readme	2018-08-01 11:41:45 +02:00
Faizan Ahmad	3030ddebf1	[STK-322] Add How it works doc (#12 ) * Add How it works doc * Update How-it-works.md * Update how it works * Add how it works reference in Readme	2018-08-01 11:41:26 +02:00
Faizan Ahmad	aa8b415fd4	[STK-322] Update readme to resolve any confusions (#9 ) * Update readme to resolve any confusions * Add new heading * Remove unnecessary deployment commands from readme * Set watch globally to true for jumbo manifest * Update chart version to resolve conflicts * Update readme with deploy with helm	2018-08-01 11:41:11 +02:00
stakater-user	d5c66bc235	Bump Version to 0.0.6	2018-07-31 09:57:23 +00:00
Faizan Ahmad	9bc62e1f4e	Merge pull request #14 from stakater/update-namespace Update fabric8 pipeline library version	2018-07-31 14:35:32 +05:00
faizanahmad055	1bd5fb5620	Update fabric8 pipeline library version	2018-07-31 14:34:37 +05:00
stakater-user	4b233872bb	Bump Version to 0.0.5	2018-07-29 09:35:14 +00:00
Faizan Ahmad	569c0469fe	[STK-322] Add Reloader vs ConfigmapController doc (#11 ) * Add Reloader vs ConfigmapController doc * Rename doc to docs * Rename Reloader vs ConfigmapController to Reloader-vs-ConfigmapController * Fix Reloader-vs-ConfigmapController heading	2018-07-29 11:13:32 +02:00
stakater-user	599ceafd6b	Bump Version to 0.0.4	2018-07-27 10:48:26 +00:00
Hazim	30ca4b463a	Merge pull request #10 from stakater/fix-testcase [STK-322] Add random seq with namespace name to make it unique	2018-07-27 15:26:33 +05:00
faizanahmad055	e4756034ea	Add random seq with namespace name to make it unique	2018-07-27 15:23:09 +05:00
stakater-user	2cc4941ffe	Bump Version to 0.0.3	2018-07-26 16:11:54 +00:00
Waseem Hassan	53ca2ef340	Merge pull request #8 from stakater/make-jumbo-manifest [STK-322] Increase test case timeout	2018-07-26 20:49:57 +05:00
faizanahmad055	9d38927e4a	Increase test case timeout	2018-07-26 20:23:20 +05:00
Waseem Hassan	c670fb7e65	Merge pull request #7 from stakater/reloader-global-watch [STK-322] Update deployment and rbac to watch globally	2018-07-26 18:37:22 +05:00
faizanahmad055	0427d58a4f	Update fabric8 pipeline version	2018-07-26 18:21:43 +05:00
faizanahmad055	1ad7a8fa76	Update deployment and rbac to watch globally	2018-07-26 17:36:33 +05:00
stakater-user	1f1862a0f5	Bump Version to 0.0.2	2018-07-26 11:32:26 +00:00
Waseem Hassan	0b0679bbd8	Merge pull request #2 from stakater/rollback-upgrade-deployment [STK-322] Rollback upgrade deployment	2018-07-26 16:15:31 +05:00
faizanahmad055	dd2b3de46d	Update fabric8 pipeline library version	2018-07-26 14:43:04 +05:00
faizanahmad055	0454d18510	Fix manifest and .version	2018-07-26 13:28:26 +05:00
Faizan Ahmad	b99994e997	Merge branch 'master' into rollback-upgrade-deployment	2018-07-26 13:13:06 +05:00
faizanahmad055	c8c0f98c1d	Implement PR-2 review comments	2018-07-26 12:59:10 +05:00
faizanahmad055	e11e1744cd	Use fake client for update tests	2018-07-24 21:17:56 +05:00
faizanahmad055	2cac0cc713	Implement PR-2 review comments	2018-07-24 21:05:50 +05:00
faizanahmad055	5b467b731c	Revamp perform rolling method	2018-07-24 17:45:48 +05:00
faizanahmad055	61a2af1782	Remove SHA data log	2018-07-23 19:20:52 +05:00
faizanahmad055	c7d4a0aa9d	Fix controller e2e test cases	2018-07-23 19:00:05 +05:00
faizanahmad055	effc40cab1	Added Daemonset and statefulset e2e test	2018-07-23 18:31:33 +05:00
faizanahmad055	034d2dcd93	Implement golangci review comments on PR-2	2018-07-23 16:10:53 +05:00
faizanahmad055	81c7b3ef25	Implement PR-2 review comments	2018-07-23 15:24:52 +05:00
faizanahmad055	5befb4d6eb	Optimize rollingUpgrade method	2018-07-19 18:18:51 +05:00
faizanahmad055	97b7286c2b	Fix helper package error	2018-07-19 18:08:49 +05:00
faizanahmad055	17b6d58300	Add handler testcases	2018-07-19 18:04:07 +05:00
faizanahmad055	f89f59c5b2	Fix rbac permission issue	2018-07-18 19:56:12 +05:00
faizanahmad055	a317555db9	Add helper class and complete integration test	2018-07-18 16:19:37 +05:00
faizanahmad055	a3f8f30a6f	Update readme with secret annotation	2018-07-17 17:20:13 +05:00
faizanahmad055	f05d4ed0eb	Fix testcase with updated annotation	2018-07-17 16:55:54 +05:00
faizanahmad055	6bc9072418	Fix SHA generation	2018-07-17 16:43:09 +05:00
faizanahmad055	d9379d18f2	Add seperate annotation for secret	2018-07-17 15:20:01 +05:00
faizanahmad055	d2ae8ce4cb	Merge branch 'master' of github.com:stakater/Reloader into rollback-upgrade-deployment	2018-07-17 13:54:35 +05:00
faizanahmad055	6a5341aebf	Add initial rolling upgrade changes	2018-07-16 20:03:07 +05:00
@@ -1 +1 @@
 .0.1
 .0.16