如何在 Kubernetes 上创建 MongoDB 集群？

Question

我想创建MongoDB三台机器的副本，需要指定这些机器的IP地址吗？但是他们运行进入一个 pod 并拥有一个动态 IP。如果您尝试指定 DNS 名称服务 MongoDB 他说

No host described in new configuration XXXXX for replica set app_replica maps to this node

如何为 c k8s 配置 MongoDB 副本？

我为 k8s 使用 DNS 插件。我尝试按如下方式初始化集群：

var config = {
    "_id" : "app_replica",
    "members" : [
        {
            "_id" : 0,
            "host" : "mongodb-node-01"
        },
        {
            "_id" : 1,
            "host" : "mongodb-node-02"
        },
        {
            "_id" : 2,
            "host" : "mongodb-node-03",
            "arbiterOnly" : true
        }
    ]
}

rs.initiate(config)

配置服务：

apiVersion: v1
kind: Service
metadata:
  name: "mongodb-node-01"
  labels:
    app: "mongodb-node-01"
spec:
  ports:
  - port: 27017
    targetPort: 27001
  selector:
    app: "mongodb-node-01"

配置复制控制器：

apiVersion: v1
kind: ReplicationController
metadata:
  name: "mongodb-node-01"
  labels:
    app: "mongodb-node-01"
spec:
  replicas: 1
  selector:
    app: "mongodb-node-01"
  template:
    metadata:
      labels:
        app: "mongodb-node-01"
    spec:
      containers:
      - name: "mongodb-node-01"
        image: 192.168.0.139:5000/db/mongo
        command:
          - mongod
          - "--replSet"
          - "app_replica"
          - "--smallfiles"
          - "--noprealloc"
        env:
        - name: ENV
          value: "prod"
        ports:
        - containerPort: 27017
        volumeMounts:
        - name: mongo-persistent-storage
          mountPath: /data/db
          readOnly: false
      volumes:
      - name: mongo-persistent-storage
        hostPath:
          path: /data/mongo/mongodb-node-01
      nodeSelector:
        database: "true"
        mongodb01: "true"

Answer 1

您需要设置多个部署和服务。看看这个动物园管理员示例 - https://gist.github.com/bprashanth/8160d0cf1469b4b125af95f697433934

您不依赖 node/machine IP。相反，您依赖于多种服务的稳定 DNS 名称。

Answer 2

看看https://www.mongodb.com/blog/post/running-mongodb-as-a-microservice-with-docker-and-kubernetes，里面有很棒的pdf教程。

如何在 Kubernetes 上创建 MongoDB 集群？

How create MongoDB cluster on Kubernetes?

replication

networking

mongodb

docker

kubernetes