No internet access in LXD containers on Fedora 34 host (DNS issue? )

[mjlbach (Michael Lingelbach)]

Thank you so much for the response! I think I was mistaken, and that the issue is firewalld (I forgot to restart after I disabled the service). Disabling firewalld and restarting fixes the issue. I’m not quite sure what the issue is though looking at the rules.

This ended up fixing the issue for me for all but ubuntu 16.04:

firewall-cmd --add-interface=lxdbr0 --zone=trusted --permanent
firewall-cmd --reload

Lxdbr0 DHCP is blocked by firewalld in CentOS8 VM

I found a solution: As a post-installation task (after lxd init), the LXD interface must be explicitly assigned to a firewalld zone, most simply zone “trusted” for a network of trusted containers (or another zone that allows DHCP and DNS). This is required if LXD is running in a CentOS libvirt based VM or a corresponding libvirt root host. I have not yet tested how it works in a standard CentOS 8 host. The same applies to Fedora, version 31. Example: firewall-cmd --add-interface=lxdbr0 -…

Do you have any suggestions for resolving the issue with older clients not using systemd-networkd?