在docker swarm中启动MongoDB副本集

Question

version: "3.3"
services:
    cfg1-r1:
        image: mongo:3.2
        deploy:
            placement:
                constraints: [node.hostname == ram-ThinkPad-E470]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongoshard/tmp:/var/lib/mongodb
            - /opt/mongoshard/mongod.conf:/etc/mongod.conf
        networks:
            - mongoshard  
        command: ["mongod", "--configsvr", "--replSet", "rs0", "--dbpath", "/var/lib/mongodb", "--port", "27017"]

    cfg2-r1:
        image: mongo:3.2
        deploy:
            placement:
                constraints: [node.hostname == prasanna-ThinkPad-E470]
            restart_policy:
                condition: on-failure
        volumes:
            - /opt/mongoshard/tmp:/var/lib/mongodb
            - /opt/mongoshard/mongod.conf:/etc/mongod.conf
        networks:
            - mongoshard
        command: ["mongod", "--configsvr", "--replSet", "rs0", "--dbpath", "/var/lib/mongodb", "--port", "27017"]
networks:
    mongoshard:

storage:
  dbPath: /var/lib/mongodb
  journal:
    enabled: true

systemLog:
  destination: file
  logAppend: true
  path: /var/log/mongodb/mongod.log
net:
  port: 27017

MongoDB shell version v3.4.9
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.9
{
        "ok" : 0,
        "errmsg" : "No host described in new configuration 1 for replica set rs0 maps to this node",
        "code" : 93,
        "codeName" : "InvalidReplicaSetConfig"
}

编辑:我认为问题是cfg1-r1和cfg2-r2服务不在同一网络中。当我部署堆栈文件时，会创建一个名为mongo_mongoshard(overlay)的网络，当我检查它时，它只显示cfg1-r1作为其容器列表中的容器。

Answer 1

您的网络必须处于覆盖模式,以便在多台主机之间共享专用网络：

docker network create --driver overlay --attachable mongoshard

然后在你的作曲中：

networks:
  mongoshard:
    external: true

为了副本作品，你需要添加至少两个成员：

rs.initiate({ _id: "rs0", members: [{ _id: 1, host: "cfg1-r1:27017" }, { _id: 2, host: "cfg1-r2:27017" }], settings: { getLastErrorDefaults: { w: "majority", wtimeout: 30000 }}});