[英]Connection refused when connecting to the exposed port on docker container
FROM ubuntu:latest
LABEL Spongebob Dockerpants "s.dockerpants@comcast.net"
RUN apt-get update -y
RUN apt-get install -y python3-pip python3-dev build-essential
#Add source files
COPY . /app
ENV HOME=/app
WORKDIR /app
# Install Python web server and dependencies
RUN pip3 install -r requirements.txt
ENV FLASK_APP=app.py
# Expose port
EXPOSE 8090
#ENTRYPOINT ["python3"]
CMD ["python3", "app.py"]
CMD tail -f /dev/null
docker run --name taskman -p 8090:8090 -d task-manager-app:latest
CORP\n0118236 @ a-33jxiw0rv8is5 in ~/docker_pete/flask-task-manager on master*
$ docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
c1ac5cb27698 task-manager-app:latest "/bin/sh -c 'tail -f…" About a minute ago Up About a minute 0.0.0.0:8090->8090/tcp taskman
CORP\n0118236 @ a-33jxiw0rv8is5 in ~/docker_pete/flask-task-manager on master*
$ sudo netstat -nlp | grep 8090
tcp6 0 0 :::8090 :::* LISTEN 1154/docker-proxy
CORP\n0118236 @ a-33jxiw0rv8is5 in ~/docker_pete/flask-task-manager on master*
$ curl http://localhost:8090
curl: (56) Recv failure: Connection reset by peer
CORP\n0118236 @ a-33jxiw0rv8is5 in ~/docker_pete/flask-task-manager on master*
$ sudo docker port c1ac5cb27698 8090
0.0.0.0:8090
$ docker inspect c1ac5cb27698 | grep -A 55 "NetworkSettings"
"NetworkSettings": {
"Bridge": "",
"SandboxID": "7c2249761e4f48eef373c6744161b0709f312863c94fdc17138913952be698a0",
"HairpinMode": false,
"LinkLocalIPv6Address": "",
"LinkLocalIPv6PrefixLen": 0,
"Ports": {
"8090/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "8090"
}
]
},
"SandboxKey": "/var/run/docker/netns/7c2249761e4f",
"SecondaryIPAddresses": null,
"SecondaryIPv6Addresses": null,
"EndpointID": "ea7552d0ba9e8f0c865fa4a0f24781811c7332a1e7473c48e88fa4dbe6e5e05d",
"Gateway": "172.17.0.1",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"MacAddress": "02:42:ac:11:00:02",
"Networks": {
"bridge": {
"IPAMConfig": null,
"Links": null,
"Aliases": null,
"NetworkID": "cfb5be57fdeed8a08b1650b5706a00542c5249903ce33052ff3f0d3dab619675",
"EndpointID": "ea7552d0ba9e8f0c865fa4a0f24781811c7332a1e7473c48e88fa4dbe6e5e05d",
"Gateway": "172.17.0.1",
"IPAddress": "172.17.0.2",
"IPPrefixLen": 16,
"IPv6Gateway": "",
"GlobalIPv6Address": "",
"GlobalIPv6PrefixLen": 0,
"MacAddress": "02:42:ac:11:00:02",
"DriverOpts": null
}
}
}
}
CORP\n0118236 @ a-33jxiw0rv8is5 in ~/docker_pete/flask-task-manager on master*
$ ping 172.17.0.2
PING 172.17.0.2 (172.17.0.2) 56(84) bytes of data.
64 bytes from 172.17.0.2: icmp_seq=1 ttl=255 time=0.045 ms
64 bytes from 172.17.0.2: icmp_seq=2 ttl=255 time=0.042 ms
64 bytes from 172.17.0.2: icmp_seq=3 ttl=255 time=0.047 ms
^C
--- 172.17.0.2 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2053ms
rtt min/avg/max/mdev = 0.042/0.044/0.047/0.008 ms
Your docker file contains two CMD
line, but docker will only honor the latest one.您的 docker 文件包含两个
CMD
行,但 docker 将只支持最新的一个。
CMD ["python3", "app.py"]
CMD tail -f /dev/null
The actual command executed inside your container is the tail command, which doesn't bind and listen on the port.在容器中执行的实际命令是 tail 命令,它不会绑定和侦听端口。 You can ping the container because the container is alive with the
tail
command.您可以 ping 容器,因为使用
tail
命令的容器是活动的。
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