Avoid using APT to generate SSH host keys #16
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Techniques that leverage the openssh-server package’s postinst script
risk two conflicts:
- When ssh.service has been started by APT, attempting to trigger the
postinst script by starting another instance of APT deadlocks.
- When ssh.service has been started manually, the postinst script in
the unit dependency causes the proximal activation to be canceled.
To avoid these complications, invoke ssh-keygen directly. The -A option
does exactly what we need:
> Generate host keys of all default key types (rsa, ecdsa, and ed25519)
> if they do not already exist.
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Techniques that leverage the
openssh-serverpackage’spostinstscript risk two conflicts:When
ssh.servicehas been started by APT, attempting to trigger thepostinstscript by starting another instance of APT deadlocks.When
ssh.servicehas been started manually, thepostinstrun viassh-hostkey-generate.servicecauses the proximal activation ofssh.serviceto be canceled, and e.g. Ansible tasks to fail.To avoid these complications, invoke
ssh-keygendirectly. The-Aoption does exactly what we need: