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debian - systemd does not notice apache starts

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My debian-system has been infected
with the systemd-virus...



When I issue the
"service apache2 start" command to start apache, it thinks it failed, but apache is
running just fine.
So "service apache2 stop" does nothing, because system
thinks apache has not started. To stop apache, I have to issue "killall apache2"



# service apache2
            start
Job for apache2.service failed. See 'systemctl status apache2.service'
            

 and 'journalctl -xn' for
            details.


# systemctl status apache2.service 
รข
            apache2.service - LSB: Apache2 web server
 Loaded: loaded
            (/etc/init.d/apache2)
 Active: failed (Result: exit-code) since Thu 2016-06-09
            15:49:43 CEST; 32s ago
 Process: 7513 ExecStart=/etc/init.d/apache2 start
            (code=exited, status=1/FAILURE)

Jun 09 15:49:43 apache2[7513]:
            Starting web server: apache2 failed!

Jun 09 15:49:43 apache2[7513]:
            The apache2 instance did not start within 20 seconds. Please read the log files to
            discover problems ... (warning).
Jun 09 15:49:43 systemd[1]: apache2.service:
            control process exited, code=exited status=1
Jun 09 15:49:43 systemd[1]:
            Failed to start LSB: Apache2 web server.
Jun 09 15:49:43 systemd[1]: Unit
            apache2.service entered failed
            state.


The system is
debian 8.5; upgraded through many versions.



Why
does "system" think it failed, when apache is started just
fine?




[Thu Jun 09
            16:11:40.945575 2016] [mpm_prefork:notice] [pid 13426] AH00163: Apache/2.4.10 (Debian)
            mod_python/3.3.1 Python/2.7.9 OpenSSL/1.0.1t configured -- resuming normal
            operations
[Thu Jun 09 16:11:40.945846 2016] [core:notice] [pid 13426]
            AH00094: Command line:
            '/usr/sbin/apache2'


UPDATE
The
/etc/init.d/apache2 looks for a pidfile at

/var/run/apache2/apache2.pid
, but the file actually is
at 
/var/run/apache2.pid
, i.e. a subdir less.

Answer




The pidfile was in an unexpected place.
Editing

/etc/apache2/envvars
the
line


export
            APACHE_PID_FILE=/var/run/apache2$SUFFIX.pid


made
the "service apache2 start/stop" work


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