This message felt like you were reading my mind. :-D
We've been struggling for a while with an older pacemaker cluster,
unfortunately it's a highly used production cluster on a customer
site, so there's only limited testing possible. But this week I
stumbled across probably the same root cause on a test cluster, where
stopping and starting some systemd resources fails. I figured out that
after an upgrade those failing resources had new "Wants" entries in
their unit files:
# old unit
grep Wants /usr/lib/systemd/system/glance-api.service
Wants=network-online.target
# new unit
grep Wants /usr/lib/systemd/system/glance-api.service
Wants=postgresql.service mysql.service keystone.service ntp.service
rabbitmq-server.service network-online.target
These are OpenStack control nodes, and their mysql is managed by
galera for high availability. So the standalone mysql service will
never be active here. I verified for several services (like nova-api,
nova-conductor etc.) that simply removing mysql from the "Wants"
statement fixed the issue for me. During research I stumbled upon this
report (https://bugs.clusterlabs.org/show_bug.cgi?id=5404) which also
mentioned the approach to talk to systemd via dbus.
Is it reasonable to assume that the new pacemaker version will fix
what I described above? For now I'm thinking about using a drop-in
file to remove mysql from the "Wants" statement for all affected units.
Thanks!
Eugen
Zitat von Chris Lumens <clum...@redhat.com>:
Pacemaker 3.0.1, which will be released in the summer of 2025, will
include an improvement for systemd resources.
Previously, pacemaker would poll systemd resources to detect when start
and stop actions were complete. However, some resources may take a long
time to stop or start, resulting in pacemaker's polling timing out and
assuming the action failed.
Now, pacemaker will talk to systemd via dbus to be signaled when an
action is complete. This will allow properly supporting those
resources. It will also allow pacemaker to more quickly react to
changes in state of all systemd resources.
There is nothing you need to do to take advantage of this improvement.
- Chris
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