[CentOS] Restarting docker daemon fixes network problem inside containers

[Tom Grace]

On 30/01/2018 09:54, Andrew Holway wrote:
> Does anyone have a clue what the root cause of this might be?

I've had trouble before when settings in /etc/sysctl.d were disabling
ip_forwarding, which will break Docker's networking in some configurations.

You may also want to check firewall rules if you have some configuration
management tool controlling them.