k8s 搭建mongodb多副本集群

在https://kubernetes.io/blog/2017/01/running-mongodb-on-kubernetes-with-statefulsets/ 基础上添加了密码认证，与解决提示权限mongo-sidecar提示权限错误问题

制作mongodb镜像（由于keyfile直接挂载提示权限错误）

1. 生成 keyfile

openssl rand -base64 741 > mongodb-keyfile

FROM mongo:3.6.4

ADD mongodb-keyfile /data/config/mongodb-keyfile
RUN chown mongodb:mongodb /data/config/mongodb-keyfile && chmod 600 /data/config/mongodb-keyfile

2. 部署yaml，与官方提供不同，此处需要将K8s command改为args ，否则 MONGO_INITDB_ROOT_USERNAME，MONGO_INITDB_ROOT_PASSWORD会被覆盖不能生效
sidecar https://github.com/cvallance/mongo-k8s-sidecar 也需要如下相关参数

apiVersion: rbac.authorization.k8s.io/v1beta1
kind: ClusterRoleBinding
metadata:
  name: mongo-default-view
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: view
subjects:
  - kind: ServiceAccount
    name: mongo
    namespace: mongo
---
apiVersion: v1
kind: Service
metadata:
  name: mongo
  namespace: mongo
  labels:
    name: mongo
spec:
  ports:
  - port: 27017
    targetPort: 27017
  clusterIP: None
  selector:
    role: mongo
---
apiVersion: apps/v1beta1
kind: StatefulSet
metadata:
  name: mongo
  namespace: mongo
spec:
  serviceName: "mongo"
  replicas: 3
  template:
    metadata:
      labels:
        role: mongo
        environment: prod
    spec:
      terminationGracePeriodSeconds: 10
      serviceAccountName: mongo
      containers:
        - name: mongo
          image: 567969457461.dkr.ecr.cn-northwest-1.amazonaws.com.cn/library:mongo-4-2-7-v2
          env:
          - name: MONGO_INITDB_ROOT_USERNAME
            value: admin
          - name: MONGO_INITDB_ROOT_PASSWORD
            value: dSJN52PuSqn
          args:
            - mongod
            - "--replSet"
            - rs0
            - "--bind_ip"
            - 0.0.0.0
            - --clusterAuthMode
            - keyFile
            - --keyFile
            - /data/config/mongodb-keyfile
      #      - "--smallfiles"
      #      - "--noprealloc"
          ports:
            - containerPort: 27017
          volumeMounts:
            - name: mongo-persistent-storage
              mountPath: /data/db
        - name: mongo-sidecar
          image: cvallance/mongo-k8s-sidecar
          env:
            - name: KUBE_NAMESPACE
              value: mongo
            - name: MONGODB_USERNAME
              value: admin
            - name: MONGODB_PASSWORD
              value: dSJN52PuSqn
            - name: MONGO_SIDECAR_POD_LABELS
              value: "role=mongo,environment=prod"
            - name: MONGODB_DATABASE
              value: admin
  volumeClaimTemplates:
  - metadata:
      name: mongo-persistent-storage
      annotations:
        volume.beta.kubernetes.io/storage-class: "ebs-gp2"
    spec:
      accessModes: [ "ReadWriteOnce" ]
      resources:
        requests:
          storage: 25Gi
---