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SysAdmins

Firewalld with docker in IsardVDI

If we come from a previous version with firewalld handling the NAT we had:

• firewalld service
• docker0 interface in public zone
• masquerade activated (NAT)
• docker service
• docker with disabled iptables (/etc/docker/daemon.json)

Now, with the actual src it will continue working but the configuration should be modified as follows:

• firewalld service
  • firewall-cmd --zone=public --remove-interface docker0 --permanent
  • firewall-cmd --remove-masquerade --permanent
• docker service
  • Remove /etc/docker/daemon.json or modify it to activate iptables: { "iptables": true }

Then we should restart firewalld service: systemctl restart firewalld and restart docker: systemctl restart docker

With this new configuration we will have real client IP inside isard-portal and docker will handle the open/close ports.

In cloud infrastructure configurations (docker-compose.hypervisor.yml) the remote hypervisors should open port 2022 at docker level in isard-hypervisor container (not automated yet, you need to edit the config manually) or forward that port inside the isard-hypervisor container at firewalld level:

• firewall-cmd --add-forward-port=port=2022:proto=tcp:toport=22:toaddr=172.18.255.17

NOTE1: 172.18.255 is the envvar DOCKER_NET at isardvdi.conf. Modify accordingly if you modified DOCKER_NET.

Also, if you are in local infrastructure configurations (docker-compose.hypervisor-standalone.yml) you will need to forward port 2022 and also the full video ports (as this configuration will not have the isard-video included):

• firewall-cmd --add-forward-port=port=2022:proto=tcp:toport=22:toaddr=172.18.255.17
• firewall-cmd --add-forward-port=port=5900-6899:proto=tcp:toport=5900-6899:toaddr=172.18.255.17

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Last update: June 15, 2023