[ClusterLabs] pacemaker systemd resource

[Ken Gaillot]

On Wed, 2020-07-22 at 10:59 +0300, Хиль  Эдуард wrote:
> Hi there! I have 2 nodes with Pacemaker 2.0.3, corosync 3.0.3 on
> ubuntu 20 + 1 qdevice. I want to define new resource as systemd
> unit dummy.service :
>  
> [Unit]
> Description=Dummy
> [Service]
> Restart=on-failure
> StartLimitInterval=20
> StartLimitBurst=5
> TimeoutStartSec=0
> RestartSec=5
> Environment="HOME=/root"
> SyslogIdentifier=dummy
> ExecStart=/usr/local/sbin/dummy.sh
> [Install]
> WantedBy=multi-user.target
>  
> and /usr/local/sbin/dummy.sh :
>  
> #!/bin/bash
> CNT=0
> while true; do
>   let CNT++
>   echo "hello world $CNT"
>   sleep 5
> done
>  
> and then i try to define it with: pcs resource create dummy.service
> systemd:dummy op monitor interval="10s" timeout="15s"
> after 2 seconds node2 reboot. In logs i see pacemaker in 2 seconds
> tried to start this unit, and it started, but pacemaker somehow think
> he is «Timed Out» . What i am doing wrong? Logs below.

The start is timing out because the ExecStart script never returns.

systemd starts processes but it doesn't daemonize them -- the script is
responsible for doing that itself. You can search online for more
details about daemonization, but most importantly you want to run your
daemon as a subprocess in the background and have your main process
return as soon as the daemon is ready for service.


> Jul 21 15:53:41 node2.local pacemaker-controld[1813]:  notice: Result
> of probe operation for dummy.service on node2.local: 7 (not running) 
> Jul 21 15:53:41 node2.local systemd[1]: Reloading.
> Jul 21 15:53:42 node2.local systemd[1]:
> /lib/systemd/system/dbus.socket:5: ListenStream= references a path
> below legacy directory /var/run/, updating
> /var/run/dbus/system_bus_socket → /run/dbus/system_bus_socket; please
> update the unit file accordingly.
> Jul 21 15:53:42 node2.local systemd[1]:
> /lib/systemd/system/docker.socket:6: ListenStream= references a path
> below legacy directory /var/run/, updating /var/run/docker.sock →
> /run/docker.sock; please update the unit file accordingly.
> Jul 21 15:53:42 node2.local pacemaker-execd[1808]:  notice: Giving up
> on dummy.service start (rc=0): timeout (elapsed=259719ms, remaining=-
> 159719ms)
> Jul 21 15:53:42 node2.local pacemaker-controld[1813]:  error: Result
> of start operation for dummy.service on node2.local: Timed Out 
> Jul 21 15:53:42 node2.local systemd[1]: Started Cluster Controlled
> dummy.
> Jul 21 15:53:42 node2.local dummy[9330]: hello world 1
> Jul 21 15:53:42 node2.local systemd-udevd[922]: Network interface
> NamePolicy= disabled on kernel command line, ignoring.
> Jul 21 15:53:42 node2.local pacemaker-attrd[1809]:  notice: Setting
> fail-count-dummy.service#start_0[node2.local]: (unset) -> INFINITY 
> Jul 21 15:53:42 node2.local pacemaker-attrd[1809]:  notice: Setting
> last-failure-dummy.service#start_0[node2.local]: (unset) ->
> 1595336022 
> Jul 21 15:53:42 node2.local systemd[1]: Reloading.
> Jul 21 15:53:42 node2.local systemd[1]:
> /lib/systemd/system/dbus.socket:5: ListenStream= references a path
> below legacy directory /var/run/, updating
> /var/run/dbus/system_bus_socket → /run/dbus/system_bus_socket; please
> update the unit file accordingly.
> Jul 21 15:53:42 node2.local systemd[1]:
> /lib/systemd/system/docker.socket:6: ListenStream= references a path
> below legacy directory /var/run/, updating /var/run/docker.sock →
> /run/docker.sock; please update the unit file accordingly.
> Jul 21 15:53:42 node2.local pacemaker-execd[1808]:  notice: Giving up
> on dummy.service stop (rc=0): timeout (elapsed=317181ms, remaining=-
> 217181ms)
> Jul 21 15:53:42 node2.local pacemaker-controld[1813]:  error: Result
> of stop operation for dummy.service on node2.local: Timed Out 
> Jul 21 15:53:42 node2.local systemd[1]: Stopping Daemon for dummy...
> Jul 21 15:53:42 node2.local pacemaker-attrd[1809]:  notice: Setting
> fail-count-dummy.service#stop_0[node2.local]: (unset) -> INFINITY 
> Jul 21 15:53:42 node2.local pacemaker-attrd[1809]:  notice: Setting
> last-failure-dummy.service#stop_0[node2.local]: (unset) ->
> 1595336022 
> Jul 21 15:53:42 node2.local systemd[1]: dummy.service: Succeeded.
> Jul 21 15:53:42 node2.local systemd[1]: Stopped Daemon for dummy.
> ... lost connection (node rebooting)
>  
>  
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-- 
Ken Gaillot <kgaillot at redhat.com>