Configure UFW to manage Docker related connections
Revision as of 15:03, 15 July 2021 by Discorddigital (talk | contribs) (Added information about network interface name.)
Prologue
This guide applies to Ubuntu 20.04. After you installed docker and setup UFW to block all connections by default, docker will bypass the firewall entirely.
/etc/docker/daemon.json
Start by creating/editing following file: /etc/docker/daemon.json
{
"iptables": false
}
/etc/ufw/after.rules
Then you need to edit following file as well: /etc/ufw/after.rules
Make sure to paste following lines before the last line in the file which is COMMIT
Also adjust ens3
to your default interface name.
# Put Docker behind UFW
*filter
:DOCKER-USER - [0:0]
:ufw-user-input - [0:0]
-A DOCKER-USER -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT
-A DOCKER-USER -m conntrack --ctstate INVALID -j DROP
-A DOCKER-USER -i ens3 -j ufw-user-input
-A DOCKER-USER -i ens3 -j DROP
# End Docker UFW rules
Once you've done this, execute following commands to apply your changes:
This will restart all your docker containers.
sudo systemctl restart ufw
sudo systemctl restart docker
Test your configuration to make sure the changes are working.