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[Shreenidhi Shedi <1983811@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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 https://github.com/canonical/cloud-init/pull/1365 has
introduced this change, not sure though.

We discussed a bit about this issue in
https://github.com/canonical/cloud-init/pull/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
```
```

** Affects: cloud-init
     Importance: Undecided
         Status: New


** Tags: cloud-init-22.2 hostname

** Attachment added: "cloud-init-22.1 support bundle"
   https://bugs.launchpad.net/bugs/1983811/+attachment/5607305/+files/cloud-init-22.1.tar.gz

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https://bugs.launchpad.net/bugs/1983811

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

Status in cloud-init:
  New

Bug description:
  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 https://github.com/canonical/cloud-init/pull/1365 has
  introduced this change, not sure though.

  We discussed a bit about this issue in
  https://github.com/canonical/cloud-init/pull/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
  ```
  ```

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