Public bug reported:
Hi,
I made some experiments with virtual machines with Ubuntu-20.04 at a
german cloud provider (Hetzner), who uses cloud-init to initialize
machines with a basic setup such as ip and ssh access.
During my installation tests I had to reboot the virtual machines
several times after installing or removing packages.
Occassionally (not always) I noticed that the ssh host keys have
changed, ssh complained. After accepting the new host keys (insecure!) I
found, that all key files in /etc/ssh had fresh mod times, i.e. were
freshly regenerated.
This reminds me to a bug I had reported about cloud-init some time ago,
where I could not change the host name permanently, because cloud-init
reset it to it's initial configuration at every boot time (highly
dangerous, because it seemed to reset passwords to their original state
as well.
Although cloud-init is intended to do an initial configuration for the
first boot only, it seems to remain on the system and – even worse:
occasionally – change configurations.
I've never understood what's the purpose of cloud-init remaining active
once after the machine is up and running.
** Affects: cloud-init (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1885527
Title:
cloud-init regenerating ssh-keys
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