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[mongodb-replicaset] Restructure and apply best practices (#767)
* [mongodb-replicaset] Restructure and apply best practices * Split up to one yaml file per resource * Fix old petset references * Improve persistence configuration * Config entries start with a lower-case letter * Enhance configuration * Drop component annotation * Improve test.sh * No default resoure requests/limits * Add _helpers.tpl * Version fix
This commit is contained in:
Reinhard Nägele
committed by
Michael Goodness
Michael Goodness
parent
84c8e43f0f
commit
31b168f6b6
@@ -1,6 +1,6 @@
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name: mongodb-replicaset
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home: https://github.com/mongodb/mongo
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version: 0.1.4
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version: 0.2.0
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description: NoSQL document-oriented database that stores JSON-like documents with dynamic schemas, simplifying the integration of data in content-driven applications.
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icon: https://webassets.mongodb.com/_com_assets/cms/mongodb-logo-rgb-j6w271g1xn.jpg
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sources:
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@@ -1,26 +1,23 @@
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# MongoDB Helm Chart
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## Prerequisites Details
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* Kubernetes 1.3 or higher with alpha APIs enabled.
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* Petsets are in alpha in 1.3.
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* Init containers are alpha in 1.3 and are moving to beta in 1.4.
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* Kubernetes 1.5+ with Beta APIs enabled.
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* PV support on the underlying infrastructure.
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## PetSet Details
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* http://kubernetes.io/docs/user-guide/petset/
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## StatefulSet Details
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* https://kubernetes.io/docs/concepts/abstractions/controllers/statefulsets/
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## PetSet Caveats
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* http://kubernetes.io/docs/user-guide/petset/#alpha-limitations
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## StatefulSet Caveats
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* https://kubernetes.io/docs/concepts/abstractions/controllers/statefulsets/#limitations
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## TODO
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* Set up authorization between replicaset peers.
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* Add a liveliness check.
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* Make the `test.sh` script more robust.
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* Set up authorization between replica set peers.
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* Add liveness and readiness probes
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## Chart Details
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This chart implements a dynamically scalable [MongoDB replica set](https://docs.mongodb.com/manual/tutorial/deploy-replica-set/)
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using Kubernetes PetSets and Init Containers.
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using Kubernetes StatefulSets and Init Containers.
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## Installing the Chart
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@@ -35,20 +32,41 @@ $ helm install --name my-release incubator/mongodb-replicaset
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The following tables lists the configurable parameters of the mongodb chart and their default values.
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| Parameter | Description | Default |
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| ----------------------- | ---------------------------------- | ---------------------------------------------------------- |
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| `Name` | Name of the chart | `mongodb-replicaset` |
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| `Image` | Container image name | `mongo` |
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| `ImageTag` | Container image tag | `3.2` |
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| `ImagePullPolicy` | Container pull policy | `Always` |
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| `Replicas` | k8s petset replicas | `3` |
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| `Component` | k8s selector key | `mongodb` |
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| `ReplicaSet` | MongoDB ReplicaSet name | `rs0` |
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| `ClusterRole` | Role of the cluster (Data/Config) | `shardsvr` |
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| `Cpu` | container requested cpu | `100m` |
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| `Memory` | container requested memory | `512Mi` |
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| `PeerPort` | Container listening port | `27017` |
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| `Storage` | Persistent volume size | `10Gi` |
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| Parameter | Description | Default |
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| ------------------------------- | ------------------------------------------------------------------------- | --------------------------------------------------- |
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| `replicaSet` | Name of the replica set | rs0 |
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| `replicas` | Number of replicas in the replica set | 3 |
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| `port` | MongoDB port | 27017 |
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| `installImage.name` | Image name for the init container that establishes the replica set | gcr.io/google_containers/mongodb-install |
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| `installImage.tag` | Image tag for the init container that establishes the replica set | 0.3 |
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| `installImage.pullPolicy` | Image pull policy for the init container that establishes the replica set | IfNotPresent |
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| `image.name` | MongoDB image name | mongo |
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| `image.tag` | MongoDB image tag | 3.2 |
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| `image.pullPolicy` | MongoDB image pull policy | IfNotPresent |
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| `podAnnotations` | Annotations to be added to MongoDB pods | {} |
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| `resources` | Pod resource requests and limits | {} |
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| `persistentVolume.enabled` | If `true`, persistent volume claims are created | `true` |
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| `persistentVolume.storageClass` | Persistent volume storage class | `volume.alpha.kubernetes.io/storage-class: default` |
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| `persistentVolume.accessMode` | Persistent volume access modes | [ReadWriteOnce] |
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| `persistentVolume.size` | Persistent volume size | 10Gi |
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| `persistentVolume.annotations` | Persistent volume annotations | {} |
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| `serviceAnnotations` | Annotations to be added to the service | {} |
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| `configmap` | Content of the MongoDB config file | See below |
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*MongoDB config file*
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The MongoDB config file `mongod.conf` is configured via the `configmap` configuration value. The defaults from
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`values.yaml` are the following:
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```yaml
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configmap:
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storage:
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dbPath: /data/db
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net:
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port: 27017
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replication:
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replSetName: rs0
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```
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Specify each parameter using the `--set key=value[,key=value]` argument to `helm install`.
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@@ -141,7 +159,7 @@ $ kubectl delete pod $RELEASE_NAME-mongodb-0
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pod "messy-hydra-mongodb-0" deleted
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```
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Delete all pods and let the petset controller bring it up.
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Delete all pods and let the statefulset controller bring it up.
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```console
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$ kubectl delete po -l app=mongodb
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$ kubectl get po --watch-only
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@@ -191,4 +209,3 @@ connecting to: test
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## Scaling
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Scaling should be managed by `helm upgrade`, which is the recommended way.
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You can also scale up by modifying the number of replicas on the PetSet using `kubectl patch` or `kubectl apply`. Deleting the various pods created and the associated resources needs some care and is described in the [petset documentation](http://kubernetes.io/docs/user-guide/petset/#deleting-a-pet-set).
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@@ -19,7 +19,7 @@ function join {
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}
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HOSTNAME=$(hostname)
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# Parse out cluster name, formatted as: petset_name-index
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# Parse out cluster name, formatted as: statefulset_name-index
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IFS='-' read -ra ADDR <<< "$(hostname)"
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CLUSTER_NAME="${ADDR[0]}"
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@@ -58,4 +58,4 @@ if [ $? -eq 0 ]; then
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fi
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# Do a clean shutdown of mongod
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/usr/bin/mongo --eval "db.getSiblingDB('admin').shutdownServer({force: true})"
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/usr/bin/mongo --eval "db.getSiblingDB('admin').shutdownServer({force: true})"
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@@ -1,11 +1,13 @@
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1. After the petset is created completely, one can check which instance is primary by running:
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$ for i in `seq 0 2`; do kubectl exec {{ printf "%s-%s" .Release.Name .Values.Name | trunc 24 }}-$i -- sh -c '/usr/bin/mongo --eval="printjson(rs.isMaster())"'; done.
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This assumes 3 replicas, 0 through 2. It should be modified to reflect the actual number of replicas specified.
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1. After the statefulset is created completely, one can check which instance is primary by running:
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$ for ((i = 0; i < {{ .Values.replicas }}; ++i)); do kubectl exec --namespace {{ .Release.Namespace }} {{ template "fullname" . }}-$i -- sh -c '/usr/bin/mongo --eval="printjson(rs.isMaster())"'; done
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2. One can insert a key into the primary instance of the mongodb replica set by running the following:
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$ kubectl exec MASTER_POD_NAME -- /usr/bin/mongo --eval="printjson(db.test.insert({key1: 'value1'}))"
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MASTER_POD_NAME must be replaced with the name of the master found from the previous step.
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MASTER_POD_NAME must be replaced with the name of the master found from the previous step.
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$ kubectl exec --namespace {{ .Release.Namespace }} MASTER_POD_NAME -- /usr/bin/mongo --eval="printjson(db.test.insert({key1: 'value1'}))"
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3. One can fetch the keys stored in the primary or any of the slave nodes in the following manner.
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$ kubectl exec POD_NAME -- /usr/bin/mongo --eval="rs.slaveOk(); db.test.find().forEach(printjson)"
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POD_NAME must be replaced by the name of the pod being queried.
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POD_NAME must be replaced by the name of the pod being queried.
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$ kubectl exec --namespace {{ .Release.Namespace }} POD_NAME -- /usr/bin/mongo --eval="rs.slaveOk(); db.test.find().forEach(printjson)"
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@@ -0,0 +1,16 @@
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{{/* vim: set filetype=mustache: */}}
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{{/*
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Expand the name of the chart.
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*/}}
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{{- define "name" -}}
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{{- default .Chart.Name .Values.nameOverride | trunc 63 | trimSuffix "-" -}}
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{{- end -}}
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{{/*
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Create a default fully qualified app name.
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We truncate at 63 chars because some Kubernetes name fields are limited to this (by the DNS naming spec).
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*/}}
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{{- define "fullname" -}}
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{{- $name := default .Chart.Name .Values.nameOverride -}}
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{{- printf "%s-%s" .Release.Name $name | trunc 63 | trimSuffix "-" -}}
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{{- end -}}
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@@ -0,0 +1,12 @@
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apiVersion: v1
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kind: ConfigMap
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metadata:
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labels:
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app: {{ template "name" . }}
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chart: {{ .Chart.Name }}-{{ .Chart.Version }}
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heritage: {{ .Release.Service }}
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release: {{ .Release.Name }}
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name: {{ template "fullname" . }}
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data:
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mongod.conf: |
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{{ toYaml .Values.configmap | indent 4 }}
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@@ -1,166 +0,0 @@
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# A headless service to create DNS records
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apiVersion: v1
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kind: Service
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metadata:
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name: "{{ printf "%s-%s" .Release.Name .Values.Name | trunc 24 }}"
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labels:
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heritage: {{.Release.Service | quote }}
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release: {{.Release.Name | quote }}
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clusterrole: {{.Values.ClusterRole | quote }}
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replicaset: {{.Values.ReplicaSet | quote }}
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chart: "{{.Chart.Name}}-{{.Chart.Version}}"
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component: "{{.Release.Name}}-{{.Values.Component}}"
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annotations:
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service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
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spec:
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ports:
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- port: {{.Values.PeerPort}}
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name: peer
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clusterIP: None
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selector:
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component: "{{.Release.Name}}-{{.Values.Component}}"
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---
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: "{{.Release.Name}}-mongo-config"
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data:
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mongod.conf: |
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# mongod.conf
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# Where to store the data.
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storage:
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dbPath: /data/db
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net:
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port: 27017
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# Replication Options
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# in replicated mongo databases, specify the replica set name here
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sharding:
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clusterRole: {{.Values.ClusterRole}}
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replication:
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replSetName: {{.Values.ReplicaSet}}
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---
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apiVersion: apps/v1beta1
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kind: StatefulSet
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metadata:
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name: "{{ printf "%s-%s" .Release.Name .Values.Name | trunc 24 }}"
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labels:
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heritage: {{.Release.Service | quote }}
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release: {{.Release.Name | quote }}
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clusterrole: {{.Values.ClusterRole | quote }}
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replicaset: {{.Values.ReplicaSet | quote }}
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chart: "{{.Chart.Name}}-{{.Chart.Version}}"
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component: "{{.Release.Name}}-{{.Values.Component}}"
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spec:
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serviceName: "{{ printf "%s-%s" .Release.Name .Values.Name | trunc 24 }}"
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replicas: {{default 3 .Values.Replicas}}
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template:
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metadata:
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labels:
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heritage: {{.Release.Service | quote }}
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release: {{.Release.Name | quote }}
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clusterrole: {{.Values.ClusterRole | quote }}
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replicaset: {{.Values.ReplicaSet | quote }}
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chart: "{{.Chart.Name}}-{{.Chart.Version}}"
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component: "{{.Release.Name}}-{{.Values.Component}}"
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annotations:
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pod.alpha.kubernetes.io/init-containers: '[
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{
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"name": "install",
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"image": "{{.Values.InstallImage}}:{{.Values.InstallImageTag}}",
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"args": ["--work-dir=/work-dir"],
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"imagePullPolicy": "{{.Values.ImagePullPolicy}}",
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"volumeMounts": [
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{
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"name": "workdir",
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"mountPath": "/work-dir"
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},
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{
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"name": "config",
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"mountPath": "/config"
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}
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]
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},
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{
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"name": "bootstrap",
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"image": "{{.Values.Image}}:{{.Values.ImageTag}}",
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"command": ["/work-dir/peer-finder"],
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"args": ["-on-start=\"/work-dir/on-start.sh\"", "-service={{ printf "%s-%s" .Release.Name .Values.Name | trunc 24 }}"],
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"imagePullPolicy": "{{.Values.ImagePullPolicy}}",
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"env": [
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{
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"name": "POD_NAMESPACE",
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"valueFrom": {
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"fieldRef": {
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"apiVersion": "v1",
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"fieldPath": "metadata.namespace"
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}
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}
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},
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{
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"name": "RS",
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"value": "{{.Values.ReplicaSet}}"
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}
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],
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"volumeMounts": [
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{
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"name": "workdir",
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"mountPath": "/work-dir"
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},
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{
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"name": "config",
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"mountPath": "/config"
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},
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{
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"name": "datadir",
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"mountPath": "/data/db"
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}
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]
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}
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]'
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spec:
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containers:
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- name: "{{ printf "%s-%s" .Release.Name .Values.Name | trunc 24 }}"
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image: "{{.Values.Image}}:{{.Values.ImageTag}}"
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imagePullPolicy: "{{.Values.ImagePullPolicy}}"
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ports:
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- containerPort: {{.Values.PeerPort}}
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name: peer
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resources:
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requests:
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cpu: "{{.Values.Cpu}}"
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memory: "{{.Values.Memory}}"
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command:
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- /usr/bin/mongod
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- --config=/config/mongod.conf
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readinessProbe:
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exec:
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command:
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- sh
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- -c
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- "/usr/bin/mongo --eval 'printjson(db.serverStatus())'"
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initialDelaySeconds: 5
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timeoutSeconds: 5
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volumeMounts:
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- name: datadir
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mountPath: /data/db
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- name: config
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mountPath: /config
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volumes:
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- name: config
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configMap:
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name: "{{.Release.Name}}-mongo-config"
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- name: workdir
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emptyDir: {}
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volumeClaimTemplates:
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- metadata:
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name: datadir
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annotations:
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volume.alpha.kubernetes.io/storage-class: {{.Values.StorageClass}}
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spec:
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accessModes: [ "ReadWriteOnce" ]
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resources:
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requests:
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storage: {{.Values.Storage}}
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@@ -0,0 +1,24 @@
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# A headless service to create DNS records
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apiVersion: v1
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kind: Service
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metadata:
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annotations:
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service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
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{{- if .Values.serviceAnnotations }}
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{{ toYaml .Values.serviceAnnotations | indent 4 }}
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{{- end }}
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labels:
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app: {{ template "name" . }}
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chart: {{ .Chart.Name }}-{{ .Chart.Version }}
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heritage: {{ .Release.Service }}
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release: {{ .Release.Name }}
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name: {{ template "fullname" . }}
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spec:
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type: ClusterIP
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clusterIP: None
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ports:
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- name: peer
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port: {{ .Values.port }}
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selector:
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app: {{ template "name" . }}
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release: {{ .Release.Name }}
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@@ -0,0 +1,132 @@
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apiVersion: apps/v1beta1
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kind: StatefulSet
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metadata:
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labels:
|
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app: {{ template "name" . }}
|
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chart: {{ .Chart.Name }}-{{ .Chart.Version }}
|
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heritage: {{ .Release.Service }}
|
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release: {{ .Release.Name }}
|
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name: {{ template "fullname" . }}
|
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spec:
|
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serviceName: {{ template "fullname" . }}
|
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replicas: {{ .Values.replicas }}
|
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template:
|
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metadata:
|
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labels:
|
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app: {{ template "name" . }}
|
||||
release: {{ .Release.Name }}
|
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annotations:
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{{- if .Values.podAnnotations }}
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{{ toYaml .Values.podAnnotations | indent 8}}
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{{- end }}
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pod.alpha.kubernetes.io/init-containers: '[
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{
|
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"name": "install",
|
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"image": "{{ .Values.installImage.name }}:{{ .Values.installImage.tag }}",
|
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"args": ["--work-dir=/work-dir"],
|
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"imagePullPolicy": "{{ .Values.installImage.pullPolicy }}",
|
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"volumeMounts": [
|
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{
|
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"name": "workdir",
|
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"mountPath": "/work-dir"
|
||||
},
|
||||
{
|
||||
"name": "config",
|
||||
"mountPath": "/config"
|
||||
}
|
||||
]
|
||||
},
|
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{
|
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"name": "bootstrap",
|
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"image": "{{ .Values.image.name }}:{{ .Values.image.tag }}",
|
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"command": ["/work-dir/peer-finder"],
|
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"args": ["-on-start=/work-dir/on-start.sh", "-service={{ template "fullname" . }}"],
|
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"imagePullPolicy": "{{ .Values.image.pullPolicy }}",
|
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"env": [
|
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{
|
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"name": "POD_NAMESPACE",
|
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"valueFrom": {
|
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"fieldRef": {
|
||||
"apiVersion": "v1",
|
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"fieldPath": "metadata.namespace"
|
||||
}
|
||||
}
|
||||
},
|
||||
{
|
||||
"name": "RS",
|
||||
"value": "{{ .Values.replicaSet }}"
|
||||
}
|
||||
],
|
||||
"volumeMounts": [
|
||||
{
|
||||
"name": "workdir",
|
||||
"mountPath": "/work-dir"
|
||||
},
|
||||
{
|
||||
"name": "config",
|
||||
"mountPath": "/config"
|
||||
},
|
||||
{
|
||||
"name": "datadir",
|
||||
"mountPath": "/data/db"
|
||||
}
|
||||
]
|
||||
}
|
||||
]'
|
||||
spec:
|
||||
containers:
|
||||
- name: {{ template "name" . }}
|
||||
image: "{{ .Values.image.name }}:{{ .Values.image.tag }}"
|
||||
imagePullPolicy: "{{ .Values.image.pullPolicy }}"
|
||||
ports:
|
||||
- name: peer
|
||||
containerPort: {{ .Values.port }}
|
||||
resources:
|
||||
{{ toYaml .Values.resources | indent 12 }}
|
||||
command:
|
||||
- /usr/bin/mongod
|
||||
- --config=/config/mongod.conf
|
||||
readinessProbe:
|
||||
exec:
|
||||
command:
|
||||
- sh
|
||||
- -c
|
||||
- "/usr/bin/mongo --eval 'printjson(db.serverStatus())'"
|
||||
initialDelaySeconds: 5
|
||||
timeoutSeconds: 5
|
||||
volumeMounts:
|
||||
- name: datadir
|
||||
mountPath: /data/db
|
||||
- name: config
|
||||
mountPath: /config
|
||||
volumes:
|
||||
- name: config
|
||||
configMap:
|
||||
name: {{ template "fullname" . }}
|
||||
- name: workdir
|
||||
emptyDir: {}
|
||||
{{- if .Values.persistentVolume.enabled }}
|
||||
volumeClaimTemplates:
|
||||
- metadata:
|
||||
name: datadir
|
||||
annotations:
|
||||
{{- if .Values.persistentVolume.storageClass | quote }}
|
||||
volume.beta.kubernetes.io/storage-class: {{ .Values.persistentVolume.storageClass | quote }}
|
||||
{{- else }}
|
||||
volume.alpha.kubernetes.io/storage-class: default
|
||||
{{- end }}
|
||||
{{- range $key, $value := .Values.persistentVolume.annotations }}
|
||||
{{ $key }}: {{ $value }}
|
||||
{{- end }}
|
||||
spec:
|
||||
accessModes:
|
||||
{{- range .Values.persistentVolume.accessModes }}
|
||||
- {{ . | quote }}
|
||||
{{- end }}
|
||||
resources:
|
||||
requests:
|
||||
storage: {{ .Values.persistentVolume.size | quote }}
|
||||
{{- else }}
|
||||
- name: datadir
|
||||
emptyDir: {}
|
||||
{{- end }}
|
||||
@@ -1,6 +1,6 @@
|
||||
#! /bin/bash
|
||||
|
||||
# Copyright 2016 The Kubernetes Authors All rights reserved.
|
||||
# Copyright 2016 The Kubernetes Authors. All rights reserved.
|
||||
#
|
||||
# Licensed under the Apache License, Version 2.0 (the "License");
|
||||
# you may not use this file except in compliance with the License.
|
||||
@@ -14,11 +14,29 @@
|
||||
# See the License for the specific language governing permissions and
|
||||
# limitations under the License.
|
||||
|
||||
POD_NAME=$RELEASE_NAME-mongodb-replicaset
|
||||
POD_NAME=${POD_NAME:0:24}
|
||||
NS="${RELEASE_NAMESPACE:-default}"
|
||||
POD_NAME="${RELEASE_NAME:-mongo}-mongodb-replicaset"
|
||||
|
||||
for i in `seq 0 2`; do
|
||||
pod="${POD_NAME}-$i"
|
||||
kubectl exec --namespace $NS $pod -- sh -c '/usr/bin/mongo --eval="printjson(rs.isMaster())"' | grep '"ismaster" : true'
|
||||
|
||||
if [ $? -eq 0 ]; then
|
||||
echo "Found master: $pod"
|
||||
MASTER=$pod
|
||||
break
|
||||
fi
|
||||
done
|
||||
|
||||
kubectl exec --namespace $NS $MASTER -- /usr/bin/mongo --eval='printjson(db.test.insert({"status": "success"}))'
|
||||
|
||||
kubectl exec "$POD_NAME-0" -- /usr/bin/mongo --eval="printjson(db.test.insert({\"status\": \"success\"}))"
|
||||
# TODO: find maximum duration to wait for slaves to be up-to-date with master.
|
||||
sleep 2
|
||||
kubectl exec "$POD_NAME-1" -- /usr/bin/mongo --eval="rs.slaveOk(); db.test.find().forEach(printjson)"
|
||||
kubectl exec "$POD_NAME-2" -- /usr/bin/mongo --eval="rs.slaveOk(); db.test.find().forEach(printjson)"
|
||||
|
||||
for i in `seq 0 2`; do
|
||||
pod="${POD_NAME}-$i"
|
||||
if [[ $pod != $MASTER ]]; then
|
||||
echo "Reading from slave: $pod"
|
||||
kubectl exec --namespace $NS $pod -- /usr/bin/mongo --eval='rs.slaveOk(); db.test.find().forEach(printjson)'
|
||||
fi
|
||||
done
|
||||
|
||||
@@ -1,21 +1,49 @@
|
||||
# Default values for mongodb.
|
||||
# This is a YAML-formatted file.
|
||||
# Declare name/value pairs to be passed into your templates.
|
||||
# name: value
|
||||
replicaSet: rs0
|
||||
replicas: 3
|
||||
port: 27017
|
||||
|
||||
Name: mongodb-replicaset
|
||||
PeerPort: 27017
|
||||
Component: "mongodb"
|
||||
ReplicaSet: "rs0"
|
||||
ClusterRole: "shardsvr"
|
||||
Replicas: 3
|
||||
Image: "mongo"
|
||||
ImageTag: "3.2"
|
||||
InstallImage: "gcr.io/google_containers/mongodb-install"
|
||||
InstallImageTag: "0.3"
|
||||
ImagePullPolicy: "Always"
|
||||
Cpu: "100m"
|
||||
Memory: "512Mi"
|
||||
Storage: "10Gi"
|
||||
StorageClass: generic
|
||||
# Specs for the Docker image for the init container that establishes the replica set
|
||||
installImage:
|
||||
name: gcr.io/google_containers/mongodb-install
|
||||
tag: 0.3
|
||||
pullPolicy: IfNotPresent
|
||||
|
||||
# Specs for the MongoDB image
|
||||
image:
|
||||
name: mongo
|
||||
tag: 3.2
|
||||
pullPolicy: IfNotPresent
|
||||
|
||||
# Annotations to be added to MongoDB pods
|
||||
podAnnotations: {}
|
||||
|
||||
resources: {}
|
||||
# limits:
|
||||
# cpu: 100m
|
||||
# memory: 512Mi
|
||||
# requests:
|
||||
# cpu: 100m
|
||||
# memory: 512Mi
|
||||
|
||||
persistentVolume:
|
||||
enabled: true
|
||||
## If defined, volume.beta.kubernetes.io/storage-class: <storageClass>
|
||||
## Default: volume.alpha.kubernetes.io/storage-class: default
|
||||
##
|
||||
# storageClass: fast
|
||||
accessModes:
|
||||
- ReadWriteOnce
|
||||
size: 10Gi
|
||||
annotations: {}
|
||||
|
||||
# Annotations to be added to the service
|
||||
serviceAnnotations: {}
|
||||
|
||||
# Entries for the MongoDB config file
|
||||
configmap:
|
||||
storage:
|
||||
dbPath: /data/db
|
||||
net:
|
||||
port: 27017
|
||||
replication:
|
||||
replSetName: rs0
|
||||
|
||||
Reference in New Issue
Block a user