[Bug 3272] New: sshd systemd service unit launch sshd too early at bootup

[bugzilla-daemon at mindrot.org]

https://bugzilla.mindrot.org/show_bug.cgi?id=3272

            Bug ID: 3272
           Summary: sshd systemd service unit launch sshd too early at
                    bootup
           Product: Portable OpenSSH
           Version: 8.5p1
          Hardware: amd64
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P5
         Component: sshd
          Assignee: unassigned-bugs at mindrot.org
          Reporter: olivier at trillion01.com

The result being the following:
Mar 04 11:26:05 tau sshd[442]: error: Bind to port 2243 on 10.230.131.4
failed: Cannot assign requested address.
Mar 04 11:26:05 tau systemd[1]: sshd.service: Main process exited,
code=exited, status=255/EXCEPTION
Mar 04 11:26:05 tau sshd[442]: fatal: Cannot bind any address.
Mar 04 11:26:05 tau systemd[1]: sshd.service: Failed with result
'exit-code'.

It attempts to bind to an ip address before it is actually configured
and available.

There is an easy fix for that. It is to use the systemd target
network-online.target instead of the target network.target.

Details are provided here:
https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/

I did fix your service unit file very easily by changing it to:

[Unit]
Description=OpenSSH Daemon
Wants=sshdgenkeys.service network-online.target
After=sshdgenkeys.service network-online.target

[Service]
ExecStart=/usr/bin/sshd -D
ExecReload=/bin/kill -HUP $MAINPID
KillMode=process
Restart=always

[Install]
WantedBy=multi-user.target

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