9-mongo-statefulset.yml

apiVersion: apps/v1
kind: StatefulSet
metadata:
  name: mongo
  namespace: mongo-ns
spec:
  replicas: 3
  serviceName: mongo
  selector:
    matchLabels:
      app: mongo
  template:
    metadata:
      labels:
        app: mongo
      namespace: mongo-ns
    spec:
      terminationGracePeriodSeconds: 5
      initContainers:
        - name: prepare
          image: mongo
          securityContext:
            runAsUser: 0
          command:
            - /bin/sh
            - -c
          args:
            - /home/mongodb/scripts/prepare.sh
          volumeMounts:
            - name: mongo-dir
              mountPath: /home/mongodb
            - name: mongo-security
              mountPath: /home/mongodb/security
            - name: mongo-script
              mountPath: /home/mongodb/scripts
          env:
            - name: K8S_POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
      containers:
        - name: mongo
          image: mongo
          workingDir: /home/mongodb
          volumeMounts:
            - name: mongo-dir
              mountPath: /home/mongodb
            - name: mongo-config
              mountPath: /home/mongodb/config
            - name: mongo-setup
              mountPath: /docker-entrypoint-initdb.d
            - name: mongo-volume-claim
              mountPath: /data/db
          ports:
            - containerPort: 27017
          env:
            - name: K8S_POD_NAME
              valueFrom:
                fieldRef:
                  fieldPath: metadata.name
            - name: K8S_REPLICAS
              value: "3"
          envFrom:
            - configMapRef:
                name: mongo-env
            - secretRef:
                name: mongo-secret
          command:
            - /bin/sh
            - -c
          args:
            - |
              docker-entrypoint.sh mongod \
                --replSet rs0 \
                --config /home/mongodb/config/mongo.conf
      volumes:
        - name: mongo-dir
          emptyDir: {}
        - name: mongo-security
          configMap:
            name: mongo-security
            defaultMode: 256 #0400
        - name: mongo-config
          configMap:
            name: mongo-config
            defaultMode: 292 #0444
        - name: mongo-setup
          configMap:
            name: mongo-setup
            defaultMode: 365 #0555
        - name: mongo-script
          configMap:
            name: mongo-script
            defaultMode: 365 #0555
  volumeClaimTemplates:
    - metadata:
        name: mongo-volume-claim
        namespace: mongo-ns
      spec:
        resources:
          requests:
            storage: 100Mi
        accessModes:
          - ReadWriteOnce