cloud-init: hostname on first boot

[morph027]

The wiki already mentions a problem with the cloud-init images default hostname, which should work with versions > 18.2. However, i tried latest bionic image with 18.2-27-g6ef92c98-0ubuntu1~18.04.1 and it still get's it's dhcp lease for ubuntu rather then the vm hostname (which is properly set inside the vm).

 

[morph027]

Ah, during startup and package update, it seems to renew it's lease:

Aug 02 09:11:31 dc3 dhcpd[25938]: DHCPACK on 10.0.0.137 to 1a:f5:05:56:50:c3 (ubuntu) via ens18
Aug 02 09:12:28 dc3 dhcpd[25938]: DHCPACK on 10.0.0.137 to 1a:f5:05:56:50:c3 (ubuntu-runner-2) via ens18
[code]

 

[Andreas Gruhler]

I encounter a similar problem with a Centos 7 image from http://cloud.centos.org/centos/7/images/CentOS-7-x86_64-GenericCloud.qcow2

The newly created VM will show the correct name in the UI, but the actual hostname of the VM remains unchanged.
How can I change the hostname with cloud-init?