连接到远程 dockerized MongoDB 副本集

Question

在我的远程机器上，我已经设置了一个我使用 docker-compose 管理的 docker 容器机器。我为副本集中想要的每个 MongoDB 实例创建了 3 个 docker 容器

mongodb_01:
    image: mvertes/alpine-mongo
    entrypoint: ['/usr/bin/mongod', '--bind_ip_all', '--replSet', 'rs0']
    restart: always
    ports:
      - 10001:27017
    volumes:
      - ./mongodb/01:/data/db

mongodb_02:
    image: mvertes/alpine-mongo
    entrypoint: ['/usr/bin/mongod', '--bind_ip_all', '--replSet', 'rs0']
    restart: always
    depends_on:
       - mongodb_01
    ports:
      - 10002:27017
    volumes:
      - ./mongodb/02:/data/db

mongodb_03:
    image: mvertes/alpine-mongo
    entrypoint: ['/usr/bin/mongod', '--bind_ip_all', '--replSet', 'rs0']
    restart: always
    depends_on:
      - mongodb_02
    ports:
      - 10003:27017
    volumes:
      - ./mongodb/03:/data/db

我还配置了副本集。这是摘录：

"_id" : "rs0",
...
"members" : [
    {
        "_id" : 0,
        "host" : "mongodb_01:27017",
        ...
    },
    {
        "_id" : 1,
        "host" : "mongodb_02:27017",
        ...
    },
    {
        "_id" : 2,
        "host" : "mongodb_03:27017",
        ...
    }
],
...
}

一切正常，其他 docker 镜像和此副本集之间的内部通信使用连接字符串正常工作

mongodb://mongodb_01:27017,mongodb_02:27017,mongodb_03:27017/<database>?replicaSet=rs0

问题是当我需要将远程客户端连接到此副本集时。例如，在我的开发机器上通过 node 使用 mongoose 我得到：

MongoNetworkError: failed to connect to server [mongodb_02:27017] on first connect [MongoNetworkError: getaddrinfo ENOTFOUND mongodb_02 mongodb_02:27017]

有时它会在 mongodb_03 上失败。

编辑：正如所指出的，这是我来自远程机器的连接字符串：

mongodb://<remote-host>:10001,<remote-host>:10002,<remote-host>:10003/<database>?replicaSet=rs0

编辑 2：使用像 Mongodb Compass 这样的客户端我可以成功地正确连接到单个实例。当我添加副本集时，出现错误。所以我尝试用 mongodb 创建一个虚拟容器（使用 mongo:latest）。

$ docker run -it mongo:latest bash

和跑步

mongo mongodb://<remote-host>:10001,<remote-host>:10002,<remote-host>:10003/<database>?replicaSet=rs0

我得到

MongoDB shell version v4.0.6
connecting to: mongodb://<remote-host>:10001,<remote-host>:10002,<remote-host>:10003/<database>?gssapiServiceName=mongodb&replicaSet=rs0
2019-03-04T16:12:54.375+0000 I NETWORK  [js] Starting new replica set monitor for rs0/<remote-host>:10001,<remote-host>:10002,<remote-host>:10003
2019-03-04T16:12:54.377+0000 I NETWORK  [ReplicaSetMonitor-TaskExecutor] Successfully connected to <remote-host>:10003 (1 connections now open to <remote-host>:10003 with a 5 second timeout)
2019-03-04T16:12:54.377+0000 I NETWORK  [js] Successfully connected to <remote-host>:10001 (1 connections now open to <remote-host>:10001 with a 5 second timeout)
2019-03-04T16:12:54.378+0000 I NETWORK  [js] changing hosts to rs0/mongodb_01:27017,mongodb_02:27017,mongodb_03:27017 from rs0/<remote-host>:10001,<remote-host>:10002,<remote-host>:10003
2019-03-04T16:12:54.882+0000 W NETWORK  [js] Unable to reach primary for set rs0
2019-03-04T16:12:54.882+0000 I NETWORK  [js] Cannot reach any nodes for set rs0. Please check network connectivity and the status of the set. This has happened for 1 checks in a row.

等等。

感谢您的任何帮助和建议！

Answer 1

我和你遇到了完全相同的问题，我已经弄清楚了。

这是因为您的远程客户端不知道 'mongo1:27017' 主机。它仅在 docker 网络中使用。

解释我是如何解决这个问题的有点棘手。我将首先展示我的 docker-compose.yml。

version: "3.3"
services:
  mongo-primary:
    container_name: mongo-primary
    hostname: mongo-primary
    image: mongo:4.0.11
    volumes:
      - $HOME/.dockerMongoRepl/primary/data/db:/data/db
      - $HOME/.dockerMongoRepl/keyfile:/data/keyfile
    extra_hosts:
      - "address.whichCanAccess.yourServer:192.168.1.xx"
    networks:
      - mongo-cluster
    ports:
      - 27017:27017
    restart: always
    environment:
      MONGO_INITDB_ROOT_USERNAME: root
      MONGO_INITDB_ROOT_PASSWORD: changeme
    command: --bind_ip_all --auth --keyFile /data/keyfile/mongo-cluster-key --replSet rs0 --enableMajorityReadConcern false
  mongo-secondary:
    container_name: mongo-secondary
    hostname: mongo-secondary
    image: mongo:4.0.11
    volumes:
      - $HOME/.dockerMongoRepl/secondary/data/db:/data/db
      - $HOME/.dockerMongoRepl/keyfile:/data/keyfile
    depends_on:
      - mongo-primary
    extra_hosts:
      - ""address.whichCanAccess.yourServer:192.168.1.xx""
    networks:
      - mongo-cluster
    ports:
      - 27018:27017
    restart: always
    command: --bind_ip_all -auth --keyFile /data/keyfile/mongo-cluster-key --replSet rs0 --enableMajorityReadConcern false
  mongo-arbiter:
    container_name: mongo-arbiter
    hostname: mongo-arbiter
    image: mongo:4.0.11
    volumes:
      - $HOME/.dockerMongoRepl/arbiter/data/arb:/data/arb
      - $HOME/.dockerMongoRepl/keyfile:/data/keyfile
    depends_on:
      - mongo-primary
    extra_hosts:
      - ""address.whichCanAccess.yourServer:192.168.1.xx""
    networks:
      - mongo-cluster
    ports:
      - 27019:27017
    restart: always
    command: --bind_ip_all --auth --keyFile /data/keyfile/mongo-cluster-key --replSet rs0 --enableMajorityReadConcern false

networks:
  mongo-cluster:

！重要的部分是“extra_hosts”！！它可以使容器访问主机。

"address.WhichCanAccess.yourServer" <- 在我的例子中，我的 asus 路由器已经设置了 asus ddns，所以它将是 XXX.asuscomm.com

"192.168.1.xx" <- 华硕路由器分配给主机的 IP 地址

也许不需要那些撰写文件的一些配置。

使用 docker-compose 运行 3 个容器。

接下来，进入primary的mongo shell，如下设置replica

config = {
  "_id": "rs0",
  "members": [{
    "_id": 0,
    "host": "address.whichCanAccess.yourServer:27017"
  }, {
    "_id": 1,
    "host": "address.whichCanAccess.yourServer:27018"
  }, {
    "_id": 2,
    "host": "address.whichCanAccess.yourServer:27019",
    arbiterOnly: true
  }]
}

rs.initiate(config)

这样mongo容器就会通过docker的主机网络相互通信，并且可以从远程IP访问。

整个过程可以在这里找到。