Juju Charms Collection
percona-cluster package

  1. Bug #1578080
  2. Comment #0

Comment 0 for bug 1578080

Revision history for this message
Brad Marshall (brad-marshall) wrote :

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.