Kubernetes StatefulSet Manifest

External

• https://kubernetes.io/docs/reference/generated/kubernetes-api/v1.16/#statefulset-v1-apps

Internal

• StatefulSet

Example

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: postgresql
  labels:
    color: blue
spec:
  replicas: 1
  serviceName: postgresql-headless
  selector:
    matchLabels:
      app: postgresql
      role: master   
  podManagementPolicy: OrderedReady
  updateStrategy: 
    type: RollingUpdate
  template:
    metadata:
      name: postgresql
      labels:
        app: postgresql
        role: master
    spec:
      containers:
        - ...
      initContainers:
        - ...
      dnsPolicy:  ClusterFirst
      restartPolicy: Always
      schedulerName: default-scheduler
      securityContext: ...
      terminationGracePeriodSeconds: ...
  volumeClaimTemplates:
    # for details see Persistent Volume Claim Manifest
    - metadata:
        name: data
      spec:
        volumeMode: Filesystem
        # Optionally a storage class can be specified, otherwise the default storage class will be used
        # storageClassName: manual-local-storage
        accessModes:
          - ReadWriteOnce
        resources:
          requests:
            storage: 8Gi

.spec Elements

volumeClaimTemplates

"volumeClaimTemplates" is a list of persistent volume claim specifications, defining persistent volume claims that pods are allowed to reference. The StatefulSet controller is responsible for mapping network identities to claims in a way that maintains the identity of a pod. Every claim in this list must have at least one name-matching volumeMount in one container in the template. The name of the claim is specified as .metadata.name.A claim in this list takes precedence over any volumes in the template, with the same name. For more details on persistent claim manifests, see:

Persistent Volume Claim Manifest