無法連接到在本地 Docker 容器中運行的 gRPC 服務

Question

我確實閱讀了 [this similar question][1] 的答案，但這對我解決問題沒有幫助。

我的設置：

• 遠程 gRPC 服務；
• 直接在主機上運行的.py客戶端。

在該配置中，一切正常。 但是，如果我在本地 Docker 容器中啟動該remote gRPC service （ .py客戶端仍然在本地運行）：

08:49:00.434005     7 server.cc:53] Server starting
08:49:00.435603     7 server.cc:59] Server listening on 0.0.0.0:9000

我用來運行 gRPC 服務的sudo docker run --rm -it -u dud --net=host --entrypoint=/usr/local/bin/application COOL_APP ： sudo docker run --rm -it -u dud --net=host --entrypoint=/usr/local/bin/application COOL_APP

這是我的.py客戶端的一段代碼：

 HOST = 'localhost' PORT = '9000' with grpc.insecure_channel('{}:{}'.format(HOST, PORT)) as channel:

我收到以下錯誤（AFAIK 這意味着我的.py客戶端無法連接到我的 Docker 服務的host:port ）：

Traceback (most recent call last):
  File "client.py", line 31, in <module>
    for record in reader:
  File "/usr/local/lib/python2.7/site-packages/grpc/_channel.py", line 367, in next
    return self._next()
  File "/usr/local/lib/python2.7/site-packages/grpc/_channel.py", line 358, in _next
    raise self
grpc._channel._Rendezvous: <_Rendezvous of RPC that terminated with:
    status = StatusCode.UNAVAILABLE
    details = "Connect Failed"
    debug_error_string = "{"created":"@1550567018.554830000","description":"Failed to create subchannel","file":"src/core/ext/filters/client_channel/client_channel.cc","file_line":2261,"referenced_errors":[{"created":"@1550567018.554828000","description":"Pick Cancelled","file":"src/core/ext/filters/client_channel/lb_policy/pick_first/pick_first.cc","file_line":245,"referenced_errors":[{"created":"@1550567018.554798000","description":"Connect Failed","file":"src/core/ext/filters/client_channel/subchannel.cc","file_line":867,"grpc_status":14,"referenced_errors":[{"created":"@1550567018.554789000","description":"Failed to connect to remote host: OS Error","errno":61,"file":"src/core/lib/iomgr/tcp_client_posix.cc","file_line":207,"os_error":"Connection refused","syscall":"connect","target_address":"ipv6:[::1]:9000"}]}]}]}"

我已經嘗試在我的.py客戶端中設置localhost:9000 、 0.0.0.0:9000和:9000 ，但沒有奏效。

我不確定這是否有意義，但是當我運行時：

user-dev:~ user$ lsof -i tcp:8080
COMMAND     PID  USER   FD   TYPE             DEVICE SIZE/OFF NODE NAME
myservice 53941 user    6u  IPv4 0x40c50fcf1d04701d      0t0  TCP localhost:http-alt (LISTEN)
user-dev:~ user$ lsof -i tcp:9000

即，我的終端沒有顯示tcp:9000任何內容（我運行上面的命令來檢查是否真的有東西在監聽localhost:9000 ）。

更新：當我使用-p 9000:9000運行hello-world [container][2] 時，我收到一個不同的錯誤：

debug_error_string = "{"created":"@1550580085.678869000","description":"Error received from peer","file":"src/core/lib/surface/call.cc","file_line":1036,"grpc_message":"Socket closed","grpc_status":14}"
``` so I assume something is wrong with my gRPC service image / Docker flags.


  [1]: https://stackoverflow.com/questions/43911793/cannot-connect-to-go-grpc-server-running-in-local-docker-container
  [2]: https://github.com/crccheck/docker-hello-world

Answer 1

您需要告訴 docker 在外部公開端口。

嘗試將-p 9000:9000添加到您的 docker run 命令。

Answer 2

正確的命令是：

docker run -p 9000:9000 -it -u dud --entrypoint=/usr/local/bin/application COOL_APP

基本上使用-p 9000:9000並刪除--net=host 。

Answer 3

您的主機 ip不是 localhost，而是docker's ip address 。 您可以通過“docker network inspect bridge | grep IPv4Address”找到docker ip