Pacemaker

uses Corosync or heartbeat, (it seems) corosync is the one to go for.

Links

• Cluster Labs
• https://github.com/ClusterLabs/pacemaker/blob/master/doc/pcs-crmsh-quick-ref.md
• Pacemaker explained
• pcs command resference
• Pacemaker and pcs on Linux example, managing cluster resource
• Building a high-available failover cluster with Pacemaker, Corosync & PCS
• HIGH AVAILABILITY ADD-ON ADMINISTRATION
• How To Create a High Availability Setup with Corosync, Pacemaker, and Floating IPs on Ubuntu 14.04
• http://fibrevillage.com/sysadmin/304-pcs-command-reference
• http://wiki.lustre.org/Creating_Pacemaker_Resources_for_Lustre_Storage_Services
• Pacemaker and pcs on Linux example, managing cluster resource
• Cheatsheet
• PCS tips&tricks
• pacemaker + drbd + iscsi, also useful pcs tips
• Mandatory and advisory ordering in Pacemaker
• http://clusterlabs.org/pacemaker/doc/en-US/Pacemaker/1.1/html/Clusters_from_Scratch/_specifying_a_preferred_location.html
• resource sets
• History of HA clustering

Notes

by specifying -INFINITY, the constraint is binding.

Commands/tools

• crm
• crmadmin
• cibadm
• pcs
• corosync

Useful commands

Dump entire crm

cibadm -Q

FAQ

Move resource to node

pcs resource move RES NODE

Show default resource stickiness

pcs resource default

Set resource stickiness

pcs resource meta <resource_id> resource-stickiness=100

and to check:

pcs resource show <resource_id>

Or better yet:

crm_simulate -Ls

Undo resource move

pcs constraint --full

Location Constraints:
  Resource: FOO
    Enabled on: santest-a (score:INFINITY) (role: Started) (id:cli-prefer-FOO)

pcs constraint remove cli-prefer-FOO

pcs status: Error: cluster is not currently running on this node

Don't panic until after

sudo pcs status

show detailed resources

pcs resource --full

stop node

pcs cluster standby node-1

or

pcs node standby

on the node itself

set maintenance mode

pcs property set maintenance-mode=true

Error: cluster is not currently running on this node

pcs cluster start

Remove a constraint

pcs constraint list --full

to identify the constraints and then

pcs constraint remove <whatever-constraint-id>

Clear error messages

 pcs resource cleanup

Call cib_replace failed (-205): Update was older than existing configuration

can be run only once

[Error signing on to the CIB service: Transport endpoint is not connected ]

probably selinux

Show allocation scores

crm_simulate -sL

Show resource failcount

pcs resource failcount show <resource>

debug resource

pcs resource debug-start resource

*** Resource management is DISABLED *** The cluster will not attempt to start, stop or recover services

??