Hostname getting set to fqdn after upgrading to cloud-init-22.2

[ubuntu-server-builder]

This bug was originally filed in Launchpad as LP: #1983811

Launchpad details

affected_projects = []
assignee = None
assignee_name = None
date_closed = 2022-08-19T16:37:38.567425+00:00
date_created = 2022-08-08T07:08:17.420811+00:00
date_fix_committed = 2022-08-14T16:09:13.859621+00:00
date_fix_released = 2022-08-19T16:37:38.567425+00:00
id = 1983811
importance = high
is_complete = True
lp_url = https://bugs.launchpad.net/cloud-init/+bug/1983811
milestone = None
owner = sshedi
owner_name = Shreenidhi Shedi
private = False
status = fix_released
submitter = sshedi
submitter_name = Shreenidhi Shedi
tags = ['cloud-init-22.2', 'hostname']
duplicates = []

Launchpad user Shreenidhi Shedi(sshedi) wrote on 2022-08-08T07:08:17.420811+00:00

Hi All,

Environment details:
cloud-init-22.2
Photon OS 3.0 and above

I am seeing something weird after upgrading to cloud-init-22.2

My /etc/hosts looks like this:

$ cat /etc/hosts
127.0.1.1 ph3dev.local ph3dev
127.0.0.1 localhost

And my /etc/hostname

$ cat /etc/hostname
ph3dev

Now if I do systemctl restart cloud-init , /etc/hostname is getting changed.

$ cat /etc/hostname
ph3dev.local

And hostname command return fqdn instead of short name. Isn't it incorrect to have fqdn in /etc/hostname?

I have prefer_fqdn_over_hostname = True in photon.py

I changed frequency = PER_ONCE in cc_set_hostname.py and it doesn't modify /etc/hostname after that and this is how it was in cloud-init <= v22.1 and even in v22.1 we have prefer_fqdn_over_hostname set in photon.py but it doesn't modify /etc/hostname file.

I doubt that #1365 has introduced this change, not sure though.

We discussed a bit about this issue in #1365.

If it helps, I see the follwing entries in cloud-init-22.1 logs:

2022-08-08 06:58:38,498 - stages.py[DEBUG]: Running module set_hostname (<module 'cloudinit.config.cc_set_hostname' from '/usr/lib/python3.7/site-packages/cloudinit/config/cc_set_hostname.py'>) with frequency once-per-instance

And in cloud-init-22.2:

2022-08-08 07:00:38,512 - modules.py[DEBUG]: Running module set_hostname (<module 'cloudinit.config.cc_set_hostname' from '/usr/lib/python3.7/site-packages/cloudinit/config/cc_set_hostname.py'>) with frequency always

[ubuntu-server-builder]

Launchpad user Shreenidhi Shedi(sshedi) wrote on 2022-08-08T07:08:17.420811+00:00

Launchpad attachments: cloud-init-22.1 support bundle

[ubuntu-server-builder]

Launchpad user Shreenidhi Shedi(sshedi) wrote on 2022-08-08T07:09:05.520891+00:00

Launchpad attachments: cloud-init-22.2 support bundle

[ubuntu-server-builder]

Launchpad user James Falcon(falcojr) wrote on 2022-08-12T13:45:00.919556+00:00

Thanks for the detailed bug report. Yes, running always rather than once-per-instance does represent a regression.

[ubuntu-server-builder]

Launchpad user Shreenidhi Shedi(sshedi) wrote on 2022-08-14T15:59:32.168426+00:00

Issue is fixed in:
25326a3

I will close this bug or if it's not possible from my end, feel free to close this issue.

[ubuntu-server-builder]

Launchpad user Brett Holman(holmanb) wrote on 2022-08-19T16:37:39.691491+00:00

This bug is believed to be fixed in cloud-init in version 22.3. If this is still a problem for you, please make a comment and set the state back to New

Thank you.