kexec-tools/kdump.service

[Unit]
Description=Crash recovery kernel arming
After=network.target network-online.target remote-fs.target basic.target
DefaultDependencies=no

[Service]
Type=oneshot
ExecStart=/usr/bin/kdumpctl start
ExecStop=/usr/bin/kdumpctl stop
RemainAfterExit=yes
StartLimitInterval=0

[Install]
WantedBy=multi-user.target
Resolves: bz 716994 -Added systemd unit file for kdump 2011-07-04 20:32:15 +00:00			`[Unit]`
			`Description=Crash recovery kernel arming`
make kdump work when kernel crash after shutdown In RHEL6, vmcore file was created if panic occurred during shutdown. This was very useful for analyzing problems during the shutdown sequence. However, in RHEL7, vmcore will not be created after kdump service is stopped. This will make it very difficult to solve problems during shutodwn. The reason why kdump fails to dump vmcore is kdump is stopped too early during the power is off. If add "DefaultDependencies=no" to the [Unit] of kdump.service , kdump will not be stopped by systemd after shutdown command. The manpage of systemd.unit about the DefaultDependencies: If true, (the default), a few default dependencies will implicitly be created for the unit. The actual dependencies created depend on the unit type. For example, for service units, these dependencies ensure that the service is started only after basic system initialization is completed and is properly terminated on system shutdown. The manpage about basic.target: A special target unit covering basic boot-up. systemd automatically adds dependencies of the types Requires= and After= for this target unit to all services (except for those with DefaultDependencies=no). Usually this should pull-in all mount points, swap devices, sockets, timers, and path units and other basic initialization necessary for general purpose daemons. So "DefaultDependencies=no" can keep kdump not stopped too early. But to make it start when power on, add After=basic.target will be better. The systemd-devel mailed to me: using DefaultDependencies=no but also After=basic.target will make sure the service isn't started too early (but kept until systemd's final process killing spree). Signed-off-by: Chao Fan <cfan@redhat.com> Acked-by: Minfei Huang <mhuang@redhat.com> 2015-05-14 07:04:11 +00:00			`After=network.target network-online.target remote-fs.target basic.target`
			`DefaultDependencies=no`
Resolves: bz 716994 -Added systemd unit file for kdump 2011-07-04 20:32:15 +00:00
			`[Service]`
			`Type=oneshot`
Removing sysvinit files 2011-07-06 19:25:34 +00:00			`ExecStart=/usr/bin/kdumpctl start`
			`ExecStop=/usr/bin/kdumpctl stop`
Resolves: bz 716994 -Added systemd unit file for kdump 2011-07-04 20:32:15 +00:00			`RemainAfterExit=yes`
Disable the ratelimit of kdump service on hotplug events When doing cpu softplug via /sys ie) echo 0 > /sys/devices/system/cpu/cpuX/online echo 1 > /sys/devices/system/cpu/cpuX/online the kdump service is restarted on every cpu up and down. Eventually the service stops because it is rate limited by systemd. [root@dhg3 hoemann]# systemctl status kdump kdump.service - Crash recovery kernel arming Loaded: loaded (/usr/lib/systemd/system/kdump.service; enabled) Active: failed (Result: start-limit) since Tue 2014-04-22 17:02:56 MDT; 59min ago Process: 8803 ExecStop=/usr/bin/kdumpctl stop (code=exited, status=0/SUCCESS) Process: 8911 ExecStart=/usr/bin/kdumpctl start (code=killed, signal=TERM) Main PID: 8911 (code=killed, signal=TERM) Apr 22 17:02:56 dhg3 systemd[1]: Starting Crash recovery kernel arming... Apr 22 17:02:56 dhg3 systemd[1]: Stopping Crash recovery kernel arming... Apr 22 17:02:56 dhg3 systemd[1]: Starting Crash recovery kernel arming... Apr 22 17:02:56 dhg3 systemd[1]: kdump.service start request repeated too quickly, refusing to start. Apr 22 17:02:56 dhg3 systemd[1]: Failed to start Crash recovery kernel arming. Apr 22 17:02:56 dhg3 systemd[1]: Unit kdump.service entered failed state. The ratelimiting can be disabled by adding StartLimitInterval=0 to the kdump service file. Cc: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Prarit Bhargava <prarit@redhat.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> 2014-05-02 14:28:34 +00:00			`StartLimitInterval=0`
Resolves: bz 716994 -Added systemd unit file for kdump 2011-07-04 20:32:15 +00:00
Fixup sysytemd service file (bug 741272) Drop chkconfig (bug 786938) 2012-02-14 17:13:06 +00:00			`[Install]`
			`WantedBy=multi-user.target`