Dtyjlui

This is the complaint I get from systemd:

"opendkim.service: Can't open PID file /var/run/opendkim/opendkim.pid"

As seen here:

systemctl status opendkim.service

puts out this:

● opendkim.service - OpenDKIM DomainKeys Identified Mail (DKIM) Milter

   Loaded: loaded (/lib/systemd/system/opendkim.service; enabled; vendor preset: enabled)

   Active: deactivating (stop-sigterm) (Result: timeout)

     Docs: man:opendkim(8)

           man:opendkim.conf(5)

           man:opendkim-genkey(8)

           man:opendkim-genzone(8)

           man:opendkim-testadsp(8)

           man:opendkim-testkey

           http://www.opendkim.org/docs.html

  Process: 8217 ExecStart=/usr/sbin/opendkim -x /etc/opendkim.conf (code=exited, status=0/SUCCESS)

    Tasks: 6 (limit: 2361)

   CGroup: /system.slice/opendkim.service

           └─8226 /usr/sbin/opendkim -x /etc/opendkim.conf



Feb 11 04:56:48 hacksaw.org systemd[1]: Starting OpenDKIM DomainKeys Identified Mail (DKIM) Milter...

Feb 11 04:56:48 hacksaw.org systemd[1]: opendkim.service: Can't open PID file /var/run/opendkim/opendkim.pid (yet?) after start: No such file or directory

Feb 11 04:56:48 hacksaw.org opendkim[8226]: OpenDKIM Filter v2.11.0 starting (args: -x /etc/opendkim.conf)

Feb 11 04:58:18 hacksaw.org systemd[1]: opendkim.service: Start operation timed out. Terminating.

If I start the daemon by hand, it goes. This seems to be about systemd.

Other data:

#ls -ld /var/run/opendkim/

drwxr-xr-x 2 opendkim opendkim 40 Feb 11 04:25 /var/run/opendkim/

The only line on the opendkim.conf:

UserID      opendkim:opendkim

The default opendkim service file, from /lib/systemd/service:

[Unit]

Description=OpenDKIM DomainKeys Identified Mail (DKIM) Milter

Documentation=man:opendkim(8) man:opendkim.conf(5) man:opendkim-genkey(8) man:opendkim-genzone(8) man:opendkim-testadsp(8) man:opendkim-testkey http://www.opendkim.org/docs.html

After=network.target nss-lookup.target



[Service]

Type=forking

PIDFile=/var/run/opendkim/opendkim.pid

UMask=0007

ExecStart=/usr/sbin/opendkim -x /etc/opendkim.conf

Restart=on-failure

ExecReload=/bin/kill -USR1 $MAINPID



[Install]

WantedBy=multi-user.target

Since this daemon runs alone, systemd doesn't need anything special to manage it. Importantly, having a "PIDFile" directive suggests that it's a more complicated service, and will put a PID into the PIDFile on it's own.

The solution is to remove the PIDFile line. Now systemd handles it just fine.

I fixed it by specifying the PidFile in the /etc/opendkim.conf file:

PidFile                 /var/run/opendkim/opendkim.pid

I think it's better to solve it here than modifying the systemd script. Also, systemd recommends the PIDFile option if the Type option is set to forking, which it seems to be in this service.

This PidFile setting was present in the default /etc/opendkim.conf file. However, I replaced it while I was followed a tutorial for configuring OpenDKIM. So that is where it went wrong for me.