Pacemaker version on cluster node elected Designated Controller (DC)

Includes a hash which identifies the exact revision the code was built from. Used for diagnostic purposes.

The messaging layer on which Pacemaker is currently running

Used for informational and diagnostic purposes.

An arbitrary name for the cluster

This optional value is mostly for users' convenience as desired in administration, but may also be used in Pacemaker configuration rules via the #cluster-name node attribute, and by higher-level tools and resource agents.

How long to wait for a response from other nodes during start-up

The optimal value will depend on the speed and load of your network and the type of switches used.

Polling interval to recheck cluster state and evaluate rules with date specifications

Pacemaker is primarily event-driven, and looks ahead to know when to recheck cluster state for failure-timeout settings and most time-based rules. However, it will also recheck the cluster after this amount of inactivity, to evaluate rules with date specifications and serve as a fail-safe for certain types of scheduler bugs. A value of 0 disables polling. A positive value sets an interval in seconds, unless other units are specified (for example, "5min").

How a cluster node should react if notified of its own fencing

A cluster node may receive notification of a "succeeded" fencing that targeted it if fencing is misconfigured, or if fabric fencing is in use that doesn't cut cluster communication. Use "stop" to attempt to immediately stop Pacemaker and stay stopped, or "panic" to attempt to immediately reboot the local node, falling back to stop on failure. Allowed values: stop, panic

*** Advanced Use Only ***

Declare an election failed if it is not decided within this much time. If you need to adjust this value, it probably indicates the presence of a bug.

*** Advanced Use Only ***

Exit immediately if shutdown does not complete within this much time. If you need to adjust this value, it probably indicates the presence of a bug.

*** Advanced Use Only ***

If you need to adjust this value, it probably indicates the presence of a bug.

*** Advanced Use Only ***

If you need to adjust this value, it probably indicates the presence of a bug.

*** Advanced Use Only *** Enabling this option will slow down cluster recovery under all conditions

Delay cluster recovery for this much time to allow for additional events to occur. Useful if your configuration is sensitive to the order in which ping updates arrive.

How long before nodes can be assumed to be safely down when watchdog-based self-fencing via SBD is in use

If this is set to a positive value, lost nodes are assumed to achieve self-fencing using watchdog-based SBD within this much time. This does not require a fencing resource to be explicitly configured, though a fence_watchdog resource can be configured, to limit use to specific nodes. If this is set to 0 (the default), the cluster will never assume watchdog-based self-fencing. If this is set to a negative value, the cluster will use twice the local value of the `SBD_WATCHDOG_TIMEOUT` environment variable if that is positive, or otherwise treat this as 0. WARNING: When used, this timeout must be larger than `SBD_WATCHDOG_TIMEOUT` on all nodes that use watchdog-based SBD, and Pacemaker will refuse to start on any of those nodes where this is not true for the local value or SBD is not active. When this is set to a negative value, `SBD_WATCHDOG_TIMEOUT` must be set to the same value on all nodes that use SBD, otherwise data corruption or loss could occur.

How many times fencing can fail before it will no longer be immediately re-attempted on a target

Maximum amount of system load that should be used by cluster nodes

The cluster will slow down its recovery process when the amount of system resources used (currently CPU) approaches this limit

Maximum number of jobs that can be scheduled per node (defaults to 2x cores)

Author.