Question

我想创建三台机器的MongoDB副本，需要指定这些机器的IP地址吗？但他们遇到了一个pod并拥有动态IP。如果你试图指定他说的DNS名称服务MongoDB

新配置XXXXX中没有主机描述副本集 app_replica映射到此节点

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zookeeper示例 - https://gist.github.com/bprashanth/8160d0cf1469b4b125af95f697433934

您不依赖节点/机器IP。相反，您依赖于多个服务的稳定DNS名称。

Answer 2

看看https://www.mongodb.com/blog/post/running-mongodb-as-a-microservice-with-docker-and-kubernetes，有一个很棒的pdf教程。

如何在Kubernetes上创建MongoDB集群？

2 个答案: