[Bug 1778386] Re: If SSH host keys are missing, they should automatically regenerate at boot time

[Justin St. Marie]

Is there a recommended method for regenerating the keys without having
to touch the console on every virtual machine?

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https://bugs.launchpad.net/bugs/1778386

Title:
  If SSH host keys are missing, they should automatically regenerate at
  boot time

Status in openssh package in Ubuntu:
  Won't Fix

Bug description:
  When SSH host keys are missing, they should be automatically
  regenerated at boot time so SSH functions.  This is particularly
  useful if cloning VM's or using a VM template.

  I have modified the following using CentOS 7's .service file.

  /lib/systemd/system/ssh-keygen.service :

  [Unit]
  Description=OpenSSH Server Key Generation
  ConditionFileNotEmpty=|!/etc/ssh/ssh_host_rsa_key
  ConditionFileNotEmpty=|!/etc/ssh/ssh_host_ecdsa_key
  ConditionFileNotEmpty=|!/etc/ssh/ssh_host_ed25519_key
  PartOf=ssh.service sshd.socket

  [Service]
  ExecStart=/usr/sbin/dpkg-reconfigure openssh-server
  Type=oneshot
  RemainAfterExit=yes

  And added the following to ssh.service.

  /lib/systemd/system/ssh.service :
  [Unit]
  ...
  After=network.target ssh-keygen.service
  ...
  Wants=ssh-keygen.service
  ...

  I have tested this and it is working.

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