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使用 - Docker 版本 20.10.7，构建 f0df350

这就是我想要做的：在同一个 docker 网络中有两个容器——MongoDb 和 Mongo-Express 各一个。将 localhost 端口 8090 暴露给 Mongo-Express 的容器端口 8081。不暴露 MongoDd 容器中的端口。

作为 docker pull mongo 和 docker pull mongo-express 拉取的图像

场景1：工作正常

使用如下运行语句，我可以浏览 localhost:8090 并查看 Mongo-Express。

rohit@rohitu2004lts:~$ docker run -d -e --MONGO_INITDB_ROOT_USERNAME=admin -e --MONGO_INITDB_ROOT_PASSWORD=password --name mongo --net testMongoNw mongo
7b1c0ca1518d0d8390efa384fcd76504295e861547e1644cb01f1862624018af
rohit@rohitu2004lts:~$ docker run -d -p 8090:8081 -e --ME_CONFIG_MONGODB_ADMINUSERNAME=admin -e --ME_CONFIG_MONGODB_ADMINPASSWORD=password -e --ME_CONFIG_MONGODB_SERVER=mongo --name myMongoExpress --net testMongoNw mongo-express
f7ab70c43fba1dd23e2e78ae3ddf08cce28fd75d0459938b1c6f057a564decc2
rohit@rohitu2004lts:~$ docker ps -a
CONTAINER ID   IMAGE           COMMAND                  CREATED          STATUS          PORTS                                       NAMES
f7ab70c43fba   mongo-express   "tini -- /docker-ent…"   7 seconds ago    Up 4 seconds    0.0.0.0:8090->8081/tcp, :::8090->8081/tcp   myMongoExpress
7b1c0ca1518d   mongo           "docker-entrypoint.s…"   17 seconds ago   Up 14 seconds   27017/tcp                                   mongo
rohit@rohitu2004lts:~$ docker ps -a
CONTAINER ID   IMAGE           COMMAND                  CREATED          STATUS          PORTS                                       NAMES
f7ab70c43fba   mongo-express   "tini -- /docker-ent…"   19 seconds ago   Up 16 seconds   0.0.0.0:8090->8081/tcp, :::8090->8081/tcp   myMongoExpress
7b1c0ca1518d   mongo           "docker-entrypoint.s…"   29 seconds ago   Up 27 seconds   27017/tcp                                   mongo
rohit@rohitu2004lts:~$ docker logs f7ab
Welcome to mongo-express
------------------------


(node:8) [MONGODB DRIVER] Warning: Current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
Mongo Express server listening at http://0.0.0.0:8081
Server is open to allow connections from anyone (0.0.0.0)
basicAuth credentials are "admin:pass", it is recommended you change this in your config.js!
rohit@rohitu2004lts:~$

浏览 localhost:8090 的快照

场景2：不工作

但是，如果我只在将 MongoDb 从“mongo”启动为“mymongo”（或任何其他名称）时更改容器名称，Mongo-Express 会启动，但几秒钟后会退出。

rohit@rohitu2004lts:~$ docker run -d -e --MONGO_INITDB_ROOT_USERNAME=admin -e --MONGO_INITDB_ROOT_PASSWORD=password --name mymongo --net testMongoNw mongo
875b4e6b470fca677bd0566a586a40976d5f12b6e71c8d924c8889b07e9e7766
rohit@rohitu2004lts:~$ docker run -d -p 8090:8081 -e --ME_CONFIG_MONGODB_ADMINUSERNAME=admin -e --ME_CONFIG_MONGODB_ADMINPASSWORD=password -e --ME_CONFIG_MONGODB_SERVER=mymongo --name myMongoExpress --net testMongoNw mongo-express
a5e0da7e1b83e018a7010ebdb4e430d4b186161a9ad1bc36c8ce278027e705d0
rohit@rohitu2004lts:~$ docker ps -a
CONTAINER ID   IMAGE           COMMAND                  CREATED          STATUS          PORTS                                       NAMES
a5e0da7e1b83   mongo-express   "tini -- /docker-ent…"   6 seconds ago    Up 4 seconds    0.0.0.0:8090->8081/tcp, :::8090->8081/tcp   myMongoExpress
875b4e6b470f   mongo           "docker-entrypoint.s…"   34 seconds ago   Up 32 seconds   27017/tcp                                   mymongo
rohit@rohitu2004lts:~$ docker ps -a
CONTAINER ID   IMAGE           COMMAND                  CREATED          STATUS                     PORTS       NAMES
a5e0da7e1b83   mongo-express   "tini -- /docker-ent…"   16 seconds ago   Exited (0) 8 seconds ago               myMongoExpress
875b4e6b470f   mongo           "docker-entrypoint.s…"   44 seconds ago   Up 41 seconds              27017/tcp   mymongo
rohit@rohitu2004lts:~$ docker logs a5e
Welcome to mongo-express
------------------------


(node:7) [MONGODB DRIVER] Warning: Current Server Discovery and Monitoring engine is deprecated, and will be removed in a future version. To use the new Server Discover and Monitoring engine, pass option { useUnifiedTopology: true } to the MongoClient constructor.
Could not connect to database using connectionString: mongodb://mongo:27017"
(node:7) UnhandledPromiseRejectionWarning: MongoNetworkError: failed to connect to server [mongo:27017] on first connect [Error: getaddrinfo EAI_AGAIN mongo
    at GetAddrInfoReqWrap.onlookup [as oncomplete] (dns.js:66:26) {
  name: 'MongoNetworkError'
}]
    at Pool.<anonymous> (/node_modules/mongodb/lib/core/topologies/server.js:441:11)
    at Pool.emit (events.js:314:20)
    at /node_modules/mongodb/lib/core/connection/pool.js:564:14
    at /node_modules/mongodb/lib/core/connection/pool.js:1000:11
    at /node_modules/mongodb/lib/core/connection/connect.js:32:7
    at callback (/node_modules/mongodb/lib/core/connection/connect.js:289:5)
    at Socket.<anonymous> (/node_modules/mongodb/lib/core/connection/connect.js:319:7)
    at Object.onceWrapper (events.js:421:26)
    at Socket.emit (events.js:314:20)
    at emitErrorNT (internal/streams/destroy.js:92:8)
    at emitErrorAndCloseNT (internal/streams/destroy.js:60:3)
    at processTicksAndRejections (internal/process/task_queues.js:84:21)
(node:7) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:7) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
rohit@rohitu2004lts:~$

在 Mongo-Express 运行命令中 ME_CONFIG_MONGODB_SERVER 的参数值中，如果我正确指定了 MongoDB 容器名称，那么它应该可以正常工作......在场景 2 中做错了什么？谢谢你。

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