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Rename PetSet to StatefulSet in docs and examples.
This commit is contained in:
Jimmy Cuadra
175
examples/cockroachdb/cockroachdb-statefulset.yaml
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175
examples/cockroachdb/cockroachdb-statefulset.yaml
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apiVersion: v1
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kind: Service
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metadata:
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# This service is meant to be used by clients of the database. It exposes a ClusterIP that will
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# automatically load balance connections to the different database pods.
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name: cockroachdb-public
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labels:
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app: cockroachdb
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spec:
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ports:
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# The main port, served by gRPC, serves Postgres-flavor SQL, internode
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# traffic and the cli.
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- port: 26257
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targetPort: 26257
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name: grpc
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# The secondary port serves the UI as well as health and debug endpoints.
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- port: 8080
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targetPort: 8080
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name: http
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selector:
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app: cockroachdb
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---
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apiVersion: v1
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kind: Service
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metadata:
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# This service only exists to create DNS entries for each pod in the stateful
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# set such that they can resolve each other's IP addresses. It does not
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# create a load-balanced ClusterIP and should not be used directly by clients
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# in most circumstances.
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name: cockroachdb
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labels:
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app: cockroachdb
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annotations:
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# This is needed to make the peer-finder work properly and to help avoid
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# edge cases where instance 0 comes up after losing its data and needs to
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# decide whether it should create a new cluster or try to join an existing
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# one. If it creates a new cluster when it should have joined an existing
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# one, we'd end up with two separate clusters listening at the same service
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# endpoint, which would be very bad.
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service.alpha.kubernetes.io/tolerate-unready-endpoints: "true"
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# Enable automatic monitoring of all instances when Prometheus is running in the cluster.
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prometheus.io/scrape: "true"
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prometheus.io/path: "_status/vars"
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prometheus.io/port: "8080"
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spec:
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ports:
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- port: 26257
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targetPort: 26257
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name: grpc
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- port: 8080
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targetPort: 8080
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name: http
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clusterIP: None
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selector:
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app: cockroachdb
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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: cockroachdb
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spec:
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serviceName: "cockroachdb"
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replicas: 3
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template:
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metadata:
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labels:
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app: cockroachdb
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annotations:
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pod.alpha.kubernetes.io/initialized: "true"
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# Init containers are run only once in the lifetime of a pod, before
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# it's started up for the first time. It has to exit successfully
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# before the pod's main containers are allowed to start.
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# This particular init container does a DNS lookup for other pods in
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# the set to help determine whether or not a cluster already exists.
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# If any other pods exist, it creates a file in the cockroach-data
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# directory to pass that information along to the primary container that
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# has to decide what command-line flags to use when starting CockroachDB.
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# This only matters when a pod's persistent volume is empty - if it has
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# data from a previous execution, that data will always be used.
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pod.alpha.kubernetes.io/init-containers: '[
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{
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"name": "bootstrap",
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"image": "cockroachdb/cockroach-k8s-init:0.1",
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"args": [
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"-on-start=/on-start.sh",
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"-service=cockroachdb"
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],
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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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"volumeMounts": [
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{
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"name": "datadir",
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"mountPath": "/cockroach/cockroach-data"
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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: cockroachdb
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# Runs the master branch. Not recommended for production, but since
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# CockroachDB is in Beta, you don't want to run it in production
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# anyway. See
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# https://hub.docker.com/r/cockroachdb/cockroach/tags/
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# if you prefer to run a beta release.
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image: cockroachdb/cockroach
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imagePullPolicy: IfNotPresent
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ports:
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- containerPort: 26257
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name: grpc
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- containerPort: 8080
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name: http
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livenessProbe:
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httpGet:
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path: /_admin/v1/health
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port: http
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initialDelaySeconds: 30
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readinessProbe:
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httpGet:
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path: /_admin/v1/health
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port: http
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initialDelaySeconds: 10
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volumeMounts:
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- name: datadir
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mountPath: /cockroach/cockroach-data
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command:
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- "/bin/bash"
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- "-ecx"
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- |
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# The use of qualified `hostname -f` is crucial:
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# Other nodes aren't able to look up the unqualified hostname.
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CRARGS=("start" "--logtostderr" "--insecure" "--host" "$(hostname -f)" "--http-host" "0.0.0.0")
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# We only want to initialize a new cluster (by omitting the join flag)
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# if we're sure that we're the first node (i.e. index 0) and that
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# there aren't any other nodes running as part of the cluster that
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# this is supposed to be a part of (which indicates that a cluster
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# already exists and we should make sure not to create a new one).
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# It's fine to run without --join on a restart if there aren't any
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# other nodes.
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if [ ! "$(hostname)" == "cockroachdb-0" ] || \
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[ -e "/cockroach/cockroach-data/cluster_exists_marker" ]
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then
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# We don't join cockroachdb in order to avoid a node attempting
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# to join itself, which currently doesn't work
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# (https://github.com/cockroachdb/cockroach/issues/9625).
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CRARGS+=("--join" "cockroachdb-public")
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fi
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exec /cockroach/cockroach ${CRARGS[*]}
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# No pre-stop hook is required, a SIGTERM plus some time is all that's
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# needed for graceful shutdown of a node.
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terminationGracePeriodSeconds: 60
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volumes:
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- name: datadir
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persistentVolumeClaim:
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claimName: datadir
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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: anything
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spec:
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accessModes:
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- "ReadWriteOnce"
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resources:
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requests:
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storage: 1Gi
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