I'm using ubuntu, it set the dns to 127.0.0.1, however, docker can't use it, so docker use 184.108.40.206 (google public dns) by default.
the problem is behind firewall, i can't access 220.127.116.11, so we'll have to add the dns setting to docker
in /etc/default/docker add --dns for your dns ip.
DOCKER_OPTS="--dns <ip1> --dns <ip2> --dns 18.104.22.168 --dns 22.214.171.124"
I keep the google dns here so when i'm not behind firewall, i can resolve hostname with google dns.
and if you need Docker to use an HTTP proxy, it can also be specified here.
so, no more ENV http_proxy in the Dockerfile, it's not portable and should not be specified in the Dockerfile.
and don't forget to restart docker service after making the change.
service docker restart
if you're using systemd, the /etc/default/docker is not used. you'll have to add the following to
/etc/systemd/system/docker.service.d$ cat docker.conf [Service] EnvironmentFile=-/etc/default/docker ExecStart= ExecStart=/usr/bin/docker -d $DOCKER_OPTS -H fd://