Comment 12 for bug 1712680

Addendum to comment #8

Since /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg is rewritten at every boot with a cloud-init network section, any network section added to /etc/cloud/cloud.cfg will be overridden and have no effect.

A workaround for MAAS deployed CentOS images would be:
1) Log into the affected CentOS server
2) Replace the contents of /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg with the following:

network:
  config: disabled

3) Make the file immutable by running:
    sudo chattr +i /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg
4) Verify success of above command by running:
    lsattr /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg

Output should look like this:
    ----i--------e-- /etc/cloud/cloud.cfg.d/50-curtin-networking.cfg