Question

我有一个dockerized Python应用程序，该应用程序在端口8080和8081上输出数据。我正在Ubuntu系统上运行代码。

$ docker version | grep Version
 Version:      18.03.1-ce

该应用在端口8080上响应

$ curl -k localhost:8080 | tail -4
-->
TYPE hello_world_total counter
hello_world_total 3.0
TYPE hello_world_created gauge
hello_world_created 1.5617357381235116e+09

应用程序在端口8081上返回错误

$ curl -k localhost:8081
curl: (56) Recv failure: Connection reset by peer

尽管我不熟悉netstat，但我还是用它来检查端口8080和8081是否都处于LISTEN状态...

root@1d1ac2974893:/# netstat -apn
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State       PID/Program name
tcp        0      0 0.0.0.0:8080            0.0.0.0:*               LISTEN      1/python3
tcp        0      0 127.0.0.1:8081          0.0.0.0:*               LISTEN      1/python3
tcp        0      0 172.17.0.2:58220        16.46.41.11:8080        TIME_WAIT   -
tcp        0      0 172.17.0.2:58218        16.46.41.11:8080        TIME_WAIT   -
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags       Type       State         I-Node   PID/Program name     Path
root@1d1ac2974893:/#

我的Dockerfile如下所示...

$ cat Dockerfile
FROM python:3
RUN pip3 install prometheus_client
COPY sampleapp.py /src/sampleapp.py
EXPOSE 8081
CMD [ "python3", "/src/sampleapp.py" ]

运行应用程序时，我将Docker容器的端口8080和8081映射到主机上的相同端口，如下所示...

$ docker run -p 8081:8081 -p 8080:8080 sampleapp

如果我进入“容器”并重复上述curl命令，它们将按预期运行。

root@1d1ac2974893:/# curl -k localhost:8081 | tail -4
TYPE hello_world_total counter
hello_world_total 3.0
TYPE hello_world_created gauge
hello_world_created 1.5617357381235116e+09
root@1d1ac2974893:/#

AND

$ docker exec -it 1d1ac2974893 /bin/bash
root@1d1ac2974893:/# curl -k localhost:8081
Hello World

SO 问题是为什么后面的curl命令在主机系统上不起作用。

$ curl -k localhost:8081
curl: (56) Recv failure: Connection reset by peer

Answer 1

解决方法如下

公开Dockerfile中的两个端口 $ grep EXPOSE Dockerfile EXPOSE 8080 EXPOSE 8081
使用0.0.0.0而不是127.0.0.1 import http.server from prometheus_client import start_http_server from prometheus_client import Counter
HOST='0.0.0.0' HELLO_WORLD_PORT=8080 HELLO_WORLD_METRICS_PORT=8081 REQUESTS = Counter('hello_world_total', 'Hello World Requested') class MyHandler(http.server.BaseHTTPRequestHandler): def do_GET(self): REQUESTS.inc() self.send_response(200) self.end_headers() self.wfile.write(b"Hello World\n")
if name == "main": start_http_server(HELLO_WORLD_METRICS_PORT) server = http.server.HTTPServer((HOST, HELLO_WORLD_PORT), MyHandler) server.serve_forever()

Contaainer现在从主机运行时可以提供预期的结果 $ curl -k localhost:8080 Hello World $ $ curl -k localhost:8081 | tail -4 ... # TYPE hello_world_total counter hello_world_total 1.0 # TYPE hello_world_created gauge hello_world_created 1.5619773258069074e+09 $

外部参照：-Docker Rails app fails to be served - curl: (56) Recv failure: Connection reset by peer 有关类似问题的详细信息

如何使我的dockerized Python应用程序在2个单独的端口上输出？

1 个答案: