The shorewall documentation explains in http://shorewall.org/Docker.html how to configure shorewall for use with docker. The problem with the configuration is that it only allows connections from the host to the main bridge docker0
. Connections to other networks on dynamically created bridges, with names starting by default with br-
, is blocked. Instead of the recommended contents of /etc/shorewall/interfaces
, use wild-card interface names as follows:
#ZONE INTERFACE OPTIONS
#dock docker0 bridge # disabled default recommendation
dock docker0 physical=docker+,routeback=1
dock br physical=br-+,routeback=1
This declares interfaces with names starting with docker
, including the default docker0
, and starting with br-
to be in the dock
zone.
For the rest of the configuration, follow the shorewall documentation as is.
This setup fixes problems running composite apps set up manually or using docker-compose
.
Thanks! New docker user and this gist and comments allowed me to connect to running containers.
But now running containers cannot reach the wider internet. How do I do that?
Edit: resolved with help from serverfault.com/a/631877 specifically creating a /etc/shorewall/masq file and turning on ip forwarding.