Am 30.07.2014 15:04, schrieb Jóhann B. Guðmundsson: > On 07/30/2014 12:34 PM, Reindl Harald wrote: >> *how* should that both help in calling "apachectl -t" *before* stop the >> service and in case of a error-repsonse keep it running? > > ExecStartPre= takes care of the startup check as in the usecase when > the unit is not running and you initially configured the Apache daemon
first: please don't ignore the last paragraphs! takes care about what? the service would fail with or without that > Adding ExecStop= "before" actual ExecStop= line to stop the daemon > takes care of preventing you from restarting you if you made configuration > changes while the daemon/services was running should not continue with > the stop process if the ExecStop command fails. but you don't need "ExecStop" for most services systemd sends SIGTERM and so ExecStopPre would also affect services without "ExecStop" lines which are most of mine why? because they don't need CAP_KILL! that's from production, no "ExecStop" used [Service] Type=simple EnvironmentFile=-/etc/sysconfig/httpd Environment="PATH=/usr/bin:/usr/sbin" ExecStart=/usr/sbin/httpd $OPTIONS -D FOREGROUND ExecReload=/usr/sbin/httpd $OPTIONS -k graceful Restart=always RestartSec=1 PrivateTmp=yes NoNewPrivileges=yes CapabilityBoundingSet=CAP_DAC_OVERRIDE CAP_IPC_LOCK CAP_NET_BIND_SERVICE CAP_SETGID CAP_SETUID ReadOnlyDirectories=/etc ReadOnlyDirectories=/usr ReadOnlyDirectories=/var/lib InaccessibleDirectories=/home InaccessibleDirectories=/media InaccessibleDirectories=/root InaccessibleDirectories=/proc InaccessibleDirectories=/sys InaccessibleDirectories=/run/console InaccessibleDirectories=/run/dbus InaccessibleDirectories=/run/lock InaccessibleDirectories=/run/mount InaccessibleDirectories=/run/systemd/generator InaccessibleDirectories=/run/systemd/system InaccessibleDirectories=/run/systemd/users InaccessibleDirectories=/run/udev InaccessibleDirectories=/run/user InaccessibleDirectories=/var/lib/dbus InaccessibleDirectories=/var/lib/rpm InaccessibleDirectories=/var/lib/systemd InaccessibleDirectories=/var/lib/yum InaccessibleDirectories=/var/spool > Anyway beside that point daemon,services that actual come with configuration > file syntax checkers like apache does (maybe in what 20 or so range), are > few and far between let alone those configuration syntax checker that > actually exist out there fail properly if they do... step away from syntax checkers shipped with daemons, they are only one usecase (and maybe there would be some more in a few years with reliebale ways to use them with systemd) "ExecStopPost" could be any script written by the local administrator which says "you don't stop that service in case service A and B are runnining which *hard fail* if you take them away the database and so i ordered start/shutdown of the machine correctly but without hard Requires= and their drawbacks in units files" * drawbacks of Requires=: stop one service required by others stops them too, but start it don't start them at the same moment which is good because as example "mysqld" can run without "dbmail-imapd" but not the other way round so one could optimize the environment that restart/stop mysqld only is possible if dbamil-imapd is not running and "systemctl restart dbmail-imapd.service mysqld.service" does the correct order by After=/Before= in the services depending on mysqld
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