CouchDB Kubernetes Pet Set

config-settings.yaml

kind: ConfigMap
apiVersion: v1
metadata:
  name: couchdb
data:
  # Erlang VM settings. The -name flag activates the Erlang distribution; there
  # should be no reason to change this setting. The -setcookie flag is used to
  # control the Erlang magic cookie. CouchDB cluster nodes can only establish a
  # connection with one another if they share the same magic cookie.
  erlflags: >
    -name couchdb
    -setcookie macadamia

  # CouchDB server setttings. The UUID is employed in replication checkpoints
  # and should be for unique for each cluster, but shared by all members of a
  # cluster.
  kubernetes.ini: |
    [couchdb]
    uuid = changeme

    [admins]
    admin = changeme

headless-service.yaml

# Ensures individual Pets get their own DNS entries
apiVersion: v1
kind: Service
metadata:
  labels:
    app: couchdb
  name: couchdb
  namespace: default
spec:
  clusterIP: None
  ports:
  - name: couchdb
    port: 5984
  selector:
    app: couchdb

petset.yaml

apiVersion: "apps/v1alpha1"
kind: PetSet
metadata:
  name: couchdb
spec:
  serviceName: couchdb
  replicas: 3
  template:
    metadata:
      annotations:
        pod.alpha.kubernetes.io/initialized: "true"
      labels:
        app: couchdb
    spec:
      containers:
      - name: couchdb
        image: klaemo/couchdb:2.0.0
        env:
        - name: ERL_FLAGS
          valueFrom:
            configMapKeyRef:
              name: couchdb
              key: erlflags
        ports:
        - containerPort: 5984
          name: couchdb
        - containerPort: 4369
          name: epmd
        - containerPort: 9100
          name: erlang-dist
        volumeMounts:
        - mountPath: /opt/couchdb/etc/default.d
          name:  defaultd
      - name: couchdb-readiness
        image: glyndwr/kube-couchdb-readiness
        env:
        - name: POD_IP
          valueFrom:
            fieldRef:
              fieldPath: status.podIP
        - name: CLUSTER_ADM_USER
          valueFrom:
            secretKeyRef:
              name: cluster-adm
              key: username
        - name: CLUSTER_ADM_PASS
          valueFrom:
            secretKeyRef:
              name: cluster-adm
              key: password
        readinessProbe:
          exec:
            command:
              - /bin/bash
              - -c
              - ./join_cluster.py _users
          initialDelaySeconds: 15
          timeoutSeconds: 5
      volumes:
      - name: defaultd
        configMap:
          name: couchdb
          items:
            - key: kubernetes.ini
              path: kubernetes.ini