Bump Version to 0.0.7

* Add reloader vs k8s-trigger-controller doc

* Fix kubectl command in readme

.version

@@ -1 +1 @@
-0.0.6
+0.0.7

README.md

@@ -2,11 +2,11 @@
 
 ## Problem
 
-We would like to watch if some change happens in `ConfigMap` and `Secret` objects and then perform certain upgrade on relevant `Deployment`, `Deamonset` and `Statefulset`
+We would like to watch if some change happens in `ConfigMap` and `Secret` objects and then perform 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.
+Reloader can watch changes in `ConfigMap` and `Secret` and do rolling upgrades on Pods with their associated `Deployments`, `Deamonsets` and `Statefulsets`.
 
 **NOTE:** This controller has been inspired from [configmapController](https://github.com/fabric8io/configmapcontroller)
 
@@ -30,39 +30,33 @@ metadata:
     secret.reloader.stakater.com/reload: "foo"
 ```
 
-Then, providing `Reloader` is running, whenever you edit the `ConfigMap` or `Secret` called `foo` the Reloader will update the `Deployment` by adding the environment variable:
-
-```
-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:
-
-```bash
-kubectl apply -f rbac.yaml -n <namespace>
-kubectl apply -f deployment.yaml -n <namespace>
-```
+You can deploy Reloader by following methods:
 
 ### Vanilla Manifests
 
 You can apply vanilla manifests by running the following command
 
 ```bash
-kubecl apply -f https://raw.githubusercontent.com/stakater/Reloader/master/deployments/kubernetes/reloader.yaml
+kubectl apply -f https://raw.githubusercontent.com/stakater/Reloader/master/deployments/kubernetes/reloader.yaml
 ```
 
 ### 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
 
-### Monitor All namespaces
-You can monitor all namespaces in cluster by setting the `watchGlobally` flag to `true` in manifest file.
+ ```bash
+helm repo add stakater https://stakater.github.io/stakater-charts
+
+helm repo update
+
+helm install stakater/reloader
+```
+
+## Monitor All namespaces
+
+By default Reloader gets deployed in `default` namespace and watches changes `secrets` and `configmaps` in all namespaces.
 
 ## Help
 

deployments/kubernetes/chart/reloader/Chart.yaml

@@ -3,7 +3,7 @@
 apiVersion: v1
 name: reloader
 description: Reloader chart that runs on kubernetes
-version: 0.0.6
+version: 0.0.7
 keywords:
   - Reloader
   - kubernetes

deployments/kubernetes/chart/reloader/values.yaml

@@ -7,9 +7,9 @@ reloader:
   labels:
     provider: stakater
     group: com.stakater.platform
-    version: 0.0.6
+    version: 0.0.7
   image:
     name: stakater/reloader
-    tag: "0.0.6"
+    tag: "0.0.7"
     pullPolicy: IfNotPresent
-  watchGlobally: false
+  watchGlobally: true

deployments/kubernetes/manifests/deployment.yaml

@@ -7,8 +7,8 @@ metadata:
     app: reloader
     group: com.stakater.platform
     provider: stakater
-    version: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     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:0.0.6"
+        image: "stakater/reloader:0.0.7"
         imagePullPolicy: IfNotPresent
         name: reloader
       serviceAccountName: reloader

deployments/kubernetes/manifests/rbac.yaml

@@ -7,21 +7,21 @@ metadata:
     app: reloader
     group: com.stakater.platform
     provider: stakater
-    version: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     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: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     release: "RELEASE-NAME"
     heritage: "Tiller"
   name: reloader-role
@@ -51,21 +51,21 @@ rules:
       - patch
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: RoleBinding
+kind: ClusterRoleBinding
 metadata:
   labels: 
     app: reloader
     group: com.stakater.platform
     provider: stakater
-    version: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     release: "RELEASE-NAME"
     heritage: "Tiller"
   name: reloader-role-binding
   namespace: default
 roleRef:
   apiGroup: rbac.authorization.k8s.io
-  kind: Role
+  kind: ClusterRole
   name: reloader-role
 subjects:
   - kind: ServiceAccount

deployments/kubernetes/reloader.yaml

@@ -7,8 +7,8 @@ metadata:
     app: reloader
     group: com.stakater.platform
     provider: stakater
-    version: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     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:0.0.6"
+        image: "stakater/reloader:0.0.7"
         imagePullPolicy: IfNotPresent
         name: reloader
       serviceAccountName: reloader
@@ -47,21 +43,21 @@ metadata:
     app: reloader
     group: com.stakater.platform
     provider: stakater
-    version: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     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: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     release: "RELEASE-NAME"
     heritage: "Tiller"
   name: reloader-role
@@ -91,21 +87,21 @@ rules:
       - patch
 ---
 apiVersion: rbac.authorization.k8s.io/v1beta1
-kind: RoleBinding
+kind: ClusterRoleBinding
 metadata:
   labels: 
     app: reloader
     group: com.stakater.platform
     provider: stakater
-    version: 0.0.6
-    chart: "reloader-0.0.6"
+    version: 0.0.7
+    chart: "reloader-0.0.7"
     release: "RELEASE-NAME"
     heritage: "Tiller"
   name: reloader-role-binding
   namespace: default
 roleRef:
   apiGroup: rbac.authorization.k8s.io
-  kind: Role
+  kind: ClusterRole
   name: reloader-role
 subjects:
   - kind: ServiceAccount

deployments/kubernetes/templates/chart/values.yaml.tmpl

@@ -12,4 +12,4 @@ reloader:
     name: {{ getenv "DOCKER_IMAGE" }}
     tag: "{{ getenv "VERSION" }}"
     pullPolicy: IfNotPresent
-  watchGlobally: false
+  watchGlobally: true

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.

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]`