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I have a docker container built with "EXPOSE 8000" among its instructions. I started the process like this:
sudo docker run -t -i -P imagename
The process in the container is listening on 8000.
# netstat -a
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State
tcp 0 0 localhost:8000 *:* LISTEN
Active UNIX domain sockets (servers and established)
Proto RefCnt Flags Type State I-Node Path
#
On the host (i.e., outside the container), I see that port 49164 is bound to container port 8000:
[S-22]jeff@siegfried:~ $ sudo docker ps
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
0b0e333c6ec9 lkz:latest "/bin/bash" About an hour ago Up 6 minutes 0.0.0.0:49164->8000/tcp lkxyz__2015-01-18_202737
[S-22]jeff@siegfried:~ $
Inded, docker inspect says (among other things)
"NetworkSettings": {
"Bridge": "docker0",
"Gateway": "172.17.42.1",
"IPAddress": "172.17.0.16",
"IPPrefixLen": 16,
"PortMapping": null,
"Ports": {
"8000/tcp": [
{
"HostIp": "0.0.0.0",
"HostPort": "49164"
}
]
}
},
And yet, I can't talk to the container. Outside,
[S-22]jeff@siegfried:~ $ telnet localhost 49164
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
Connection closed by foreign host.
1,[S-22] jeff@siegfried:~ $
while inside,
# telnet localhost 8000
Trying ::1...
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
GET /
[18/Jan/2015 23:00:59] "GET /" 200 4066
<!DOCTYPE html>
<html>
<head>
...
I would expect the telnet to 49164 on the outside to return html as it does on the inside.
Any suggestions?
You probably want to have the service you're running in the container to listen on 0.0.0.0 rather than 127.0.0.1