无法连接到在本地 Docker 容器中运行的 gRPC 服务

Question

我确实阅读了 [this similar question][1] 的答案，但这对我解决问题没有帮助。

我的设置：

• 远程 gRPC 服务；
• 直接在主机上运行的.py客户端。

在该配置中，一切正常。 但是，如果我在本地 Docker 容器中启动该remote gRPC service （ .py客户端仍然在本地运行）：

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

我用来运行 gRPC 服务的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

这是我的.py客户端的一段代码：

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

我收到以下错误（AFAIK 这意味着我的.py客户端无法连接到我的 Docker 服务的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"}]}]}]}"

我已经尝试在我的.py客户端中设置localhost:9000 、 0.0.0.0:9000和:9000 ，但没有奏效。

我不确定这是否有意义，但是当我运行时：

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，我的终端没有显示tcp:9000任何内容（我运行上面的命令来检查是否真的有东西在监听localhost:9000 ）。

更新：当我使用-p 9000:9000运行hello-world [container][2] 时，我收到一个不同的错误：

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

您需要告诉 docker 在外部公开端口。

尝试将-p 9000:9000添加到您的 docker run 命令。

Answer 2

正确的命令是：

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

基本上使用-p 9000:9000并删除--net=host 。

Answer 3

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