add stickiness=1 to neutron agents PM resources

[Sergey Vasilenko]

add stickiness=1 to neutron agents Pacemaker resources

[Andrew Woodward (xarses)]

This is an issue for HA because it can cause L3 agent to move when not necessary which causes an outage. Increasing to high and retargeting to 5.0

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/93297

[Bogdan Dobrelya (bogdando)]

there is an option to restrict some movements for the business time , see http://clusterlabs.org/doc/en-US/Pacemaker/1.0/html/Pacemaker_Explained/s-rules-cluster-options.html#id1941641

[Dmitry Ilyin (idv1985)]

Resource stickiness is the measure of how much a resource wants to stay where it is. Or you can think about it as a cost of resource movement to another server. If there is no stickness defined pacemaker will move any resource at will to achive what it thinks optimal placement is and it's usually pretty much random. Usually pacemaker doesn't move resources during the normal operation doing so only when cluster state changes.

If stickiness is defined resource will be moved only if there is a rule with more score then the stickness value that wants to move the resource. For example, colocation can have infinity score and it will be more important then any finite stickiness and resource will be moved. Or there could be colocation with negative infinity meaning that resources will never be together.

It's very common to set stickiness for every resource using resource-defaults because no one wants the resources to move around. Usually people set score to 100 like in CLuster From Scratch manual.

Setting stickiness to 1 for some resources? Why? Let's just set stickness using resource-defaults for all resources.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/93297
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=ffb90ef1653c94b85625168fb04d3c6228ab0053
Submitter: Jenkins
Branch: master

commit ffb90ef1653c94b85625168fb04d3c6228ab0053
Author: Sergey Vasilenko <email address hidden>
Date: Mon May 12 16:51:45 2014 +0400

    add stickiness=1 to some singletone PM resources

    Change-Id: I208435a4b03007604d25e907b916018b99e2a903
    Closes-bug: #1312177

[Bogdan Dobrelya (bogdando)]

backports-4.1.1?

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/4.1
Review: https://review.openstack.org/96854

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/96854
Committed: https://git.openstack.org/cgit/stackforge/fuel-library/commit/?id=c83a8d6291624ac7769f286fb06515013cb11834
Submitter: Jenkins
Branch: stable/4.1

commit c83a8d6291624ac7769f286fb06515013cb11834
Author: Sergey Vasilenko <email address hidden>
Date: Mon May 12 16:51:45 2014 +0400

    add stickiness=1 to some singletone PM resources

    Change-Id: I208435a4b03007604d25e907b916018b99e2a903
    Closes-bug: #1312177

[Meg McRoberts (dreidellhasa)]

Documented as fixed in 4.1.1 Release Notes.