No internet connection inside Docker containers
After several manipulations with system hardening my containers lost internet connection. How to fix the problem?
Stop docker service:
$ sudo service docker stop
Flush NAT table on the host machine:
$ sudo iptables -t nat -F
Turn off docker bridge:
$ sudo ifconfig docker0 down
Remove docker bridge:
$ brctl delbr docker0
Start docker service:
$ service docker start
Docker will recreate network interfaces and fill the NAT table with required values.