+1 on your proposed approach Martin
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https://bugs.launchpad.net/bugs/1578080
Title:
percona cluster hits resource limits in HA Openstack cloud with xenial
Status in percona-xtradb-cluster-5.6 package in Ubuntu:
Won't Fix
Status in systemd package in Ubuntu:
In Progress
Status in systemd source package in Xenial:
In Progress
Status in percona-cluster package in Juju Charms Collection:
New
Status in systemd package in Debian:
Confirmed
Bug description:
I'm trying to deploy Mitaka Openstack using the 16.04 charms on Xenial
using Juju 1.25.5 and MAAS 1.9.2, with as many components of Openstack
being HA as possible.
When deployed, after running for a while mysql (which is a 3 node
cluster) starts refusing connections, and erroring:
2016-05-03 01:25:28 13795 [ERROR] Error log throttle: 50
'Can't create thread to handle new connection' error(s) suppressed
When I look at systemd-cgtop, I can see it maxing out at 512
connections.
To get it going again I do a:
$ sudo systemctl edit mysql
and set:
TasksMax=infinity
Sometimes I even need to edit /etc/systemd/system.conf and bump
DefaultTasksMax to 1024 or higher, depending on long its been left
running.
I've noticed that dropping worker-multiplier setting on nova-cloud-
controller, neutron-api etc all help to reduce the load, but I still
need to bump it up.
Please let me know if you need any more information.
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