Pacemaker

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

Links

• Cluster Labs
• Pacemaker explained
• 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
• Cheatsheet
• PCS tips&tricks
• pacemaker + drbd + iscsi, also useful pcs tips
• Mandatory and advisory ordering in Pacemaker

Notes

by specifying -INFINITY, the constraint is binding.

Commands/tools

• crm
• crmadmin
• cibadm
• pcs
• corosync

Useful commands

Dump entire crm

cibadm -Q

FAQ

show detailed resources

pcs resource --full

stop node

pcs cluster standby node-1

or

pcs node standby

set maintenance mode

pcs property set maintenance-mode=true

show virtual ip

pcs resource show IPv4_BIND

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

debug resource

pcs resource debug-start resource

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

??