[Bug 1033606] Failed to connect to network from Docker container

[Red Hat Bugzilla]

https://bugzilla.redhat.com/show_bug.cgi?id=1033606

--- Comment #6 from Marek Goldmann  ---
After boot I cannot connect to the Internet from container, but when I do:

systemctl restart firewalld
    systemctl restart docker

then I can. Restarting docker service alone does not help. Adding hard requires
to docker systemd file in the [Unit] section:

Requires=firewalld.service

doesn't help either. BTW, we should add "Wants=firewalld.service" to make sure
the firewalld service is started before Docker, if it's available.

I suspect that the issue is in the time which is needed to create all the
required devices. If we add:

ExecStartPre=/usr/bin/sleep 3

to the [Service] section makes it possible to connect to the Internet from the
container. Even 1s is sufficient on my system.