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samba-mirror/ctdb/config/ctdb.service
Ralph Boehme 6e419dda71 ctdb: increase TasksMax limit, the systemd default is just 512
In 2015 systemd introduced a TasksMax which limits the number of processes in a
unit:

https://lists.freedesktop.org/archives/systemd-devel/2015-November/035006.html

The default of 512 may be too low in certain situations leading to vfork()
failing with errno=EAGAIN when trying to spawn lock-helper processes.

With the default for LockProcessesPerDB being 200 the increased TasksMax limit
should cover the problematic scenario.

Additional background: the failing vfork()s have been seen on production
clusters and were tracked down to being logged in the context of ctdb calling
tdb_repack().

Links:

9ded9cd14c
https://www.suse.com/support/kb/doc/?id=000015901
https://success.docker.com/article/how-to-reserve-resource-temporarily-unavailable-errors-due-to-tasksmax-setting
https://www.percona.com/blog/2019/01/02/tasksmax-another-setting-that-can-cause-mysql-error-messages/

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Martin Schwenke <martin@meltin.net>

Autobuild-User(master): Martin Schwenke <martins@samba.org>
Autobuild-Date(master): Wed May 13 13:30:12 UTC 2020 on sn-devel-184
2020-05-13 13:30:12 +00:00

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Desktop File

[Unit]
Description=CTDB
Documentation=man:ctdbd(1) man:ctdb(7)
After=network-online.target time-sync.target
ConditionFileNotEmpty=/etc/ctdb/nodes
[Service]
Type=forking
LimitCORE=infinity
LimitNOFILE=1048576
TasksMax=4096
PIDFile=/run/ctdb/ctdbd.pid
ExecStart=/usr/sbin/ctdbd_wrapper start
ExecStop=/usr/sbin/ctdbd_wrapper stop
KillMode=control-group
Restart=no
[Install]
WantedBy=multi-user.target