Cloud-Init: Set-Hostname Question

[0xBEN]

Greetings,

I'll keep it short and to the point. I made an observation when doing some experimenting with cloud-init.
I first started experimenting with cloud-init on CentOS 8.

Here's the issue I encountered and on which I seek any advice or experiences from other users:

On any RHEL-based distro, /etc/hostname does not reflect the Proxmox VM name.

• Tested on:
  • CentOS 8
  • Fedora Workstation and Server

However, on any Debian-based distro, /etc/hostname does reflect the Proxmox VM name.

• Tested on:
  • Debian Buster
  • Kali
  • Ubuntu Desktop

I'll spare the extraneous information, but I followed the exact same process for both situations.
So, the only conclusion I could come to is that it is based on a limitation of the underlying distribution.
Does anyone else on the forum share a similar experience or know of a workaround?

 

[mira]

Have you checked the cloudinit config inside the VM?

 

[0xBEN]

mira,

Thank you for the reply.
Yes, I did try making several adjustments to the /etc/cloud/cloud.cfg file in the template VM.
If I added hostname: <name> or fqdn: <name> to the configuration file, it would be applied to the clone.
However, this seems to defeat the automated nature of cloud-init.
I want to avoid hardcoding any values into the config to any extent possible.

 

[mira]

I've tried as well and can reproduce the issue, but I don't have a solution. Deleting the template in /etc/cloud/templates/ did not help either.
This could be an issue with the cloud-init version used as I've found the following post: https://xcp-ng.org/forum/topic/2386/centos-8-cloud-image-not-changing-cloud-config-hostname

 

[0xBEN]

mira,

Thank you for taking the time to work through that and reproduce the issue.

I also came across that thread during my search for answers, but decided to post on Proxmox forum, as that is the cloud-init platform being used in my case.

Seems like there are no feasible next steps, then. Oh well, I do certainly appreciate your time.

 

[bta]

I'm using the GenericCloud 8.2 image from:

https://cloud.centos.org/centos/8/x86_64/images/

and it seems to be working as I expected.

In particular, I was able to change the hostname in the Proxmox options, and, after a reboot, it was configured inside the virtual machine.
The same for configuring a static IP address in the cloud-init tab of Proxmox.

Best regards,

 

[0xBEN]

I'm using the GenericCloud 8.2 image from:

https://cloud.centos.org/centos/8/x86_64/images/

and it seems to be working as I expected.

In particular, I was able to change the hostname in the Proxmox options, and, after a reboot, it was configured inside the virtual machine.
The same for configuring a static IP address in the cloud-init tab of Proxmox.

Best regards,

Thank you for following up here with your findings! I'll give it a whirl and see if I can reproduce on my end.

 

[rootnetworks]

I see this problem still happening on CentOS 8 and almalinux 8