docker 容器连不了网，怎么处理

Question

docker 容器连不了网，怎么处理

Answer 1

Run in host sysctl net.ipv4.conf.all.forwarding 确保这个转发功能为开启。
如果没开的话运行 sysctl net.ipv4.conf.all.forwarding=1 Enable it.

Answer 2

I have encountered this problem before. It was caused by modifying the firewall settings. Restarting the docker service can solve it.

The poster can try to restart the docker service, centos is service docker restart