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6.4. Resource Meta Options
In addition to the resource-specific parameters, you can configure additional resource options for any resource. These options are used by the cluster to decide how your resource should behave. Table 6.3, “Resource Meta Options” describes these options.
Table 6.3. Resource Meta Options
| Field | Default | Description |
|---|---|---|
priority
| 0
| |
target-role
| Started
|
What state should the cluster attempt to keep this resource in? Allowed values:
* Stopped - Force the resource to be stopped
* Started - Allow the resource to be started (In the case of multistate resources, they will not promoted to master)
|
is-managed
| true
| |
resource-stickiness
|
0
| |
requires
|
Calculated
|
Indicates under what conditions the resource can be started.
Defaults to
fencing except under the conditions noted below. Possible values:
*
nothing - The cluster can always start the resource.
*
quorum - The cluster can only start this resource if a majority of the configured nodes are active. This is the default value if stonith-enabled is false or the resource's standard is stonith.
*
fencing - The cluster can only start this resource if a majority of the configured nodes are active and any failed or unknown nodes have been powered off.
*
unfencing - The cluster can only start this resource if a majority of the configured nodes are active and any failed or unknown nodes have been powered off and only on nodes that have been unfenced. This is the default value if the provides=unfencing stonith meta option has been set for a fencing device.
|
migration-threshold
| INFINITY
|
How many failures may occur for this resource on a node, before this node is marked ineligible to host this resource. A value of 0 indicates that this feature is disabled (the node will never be marked ineligible); by contrast, the cluster treats
INFINITY (the default) as a very large but finite number. This option has an effect only if the failed operation has on-fail=restart (the default), and additionally for failed start operations if the cluster property start-failure-is-fatal is false. For information on configuring the migration-threshold option, see Section 8.2, “Moving Resources Due to Failure”. For information on the start-failure-is-fatal option, see Table 12.1, “Cluster Properties”.
|
failure-timeout
| 0 (disabled)
|
Used in conjunction with the
migration-threshold option, indicates how many seconds to wait before acting as if the failure had not occurred, and potentially allowing the resource back to the node on which it failed. As with any time-based actions, this is not guaranteed to be checked more frequently than the value of the cluster-recheck-interval cluster parameter. For information on configuring the failure-timeout option, see Section 8.2, “Moving Resources Due to Failure”.
|
multiple-active
| stop_start
|
What should the cluster do if it ever finds the resource active on more than one node. Allowed values:
*
block - mark the resource as unmanaged
*
stop_only - stop all active instances and leave them that way
*
stop_start - stop all active instances and start the resource in one location only
|
To change the default value of a resource option, use the following command.
pcs resource defaults options
For example, the following command resets the default value of
resource-stickiness to 100.
# pcs resource defaults resource-stickiness=100
Omitting the options parameter from the
pcs resource defaults displays a list of currently configured default values for resource options. The following example shows the output of this command after you have reset the default value of resource-stickiness to 100.
# pcs resource defaults
resource-stickiness:100
Whether you have reset the default value of a resource meta option or not, you can set a resource option for a particular resource to a value other than the default when you create the resource. The following shows the format of the
pcs resource create command you use when specifying a value for a resource meta option.
pcs resource create resource_id standard:provider:type|type [resource options] [meta meta_options...]
For example, the following command creates a resource with a
resource-stickiness value of 50.
# pcs resource create VirtualIP ocf:heartbeat:IPaddr2 ip=192.168.0.120 cidr_netmask=24 meta resource-stickiness=50
You can also set the value of a resource meta option for an existing resource, group, cloned resource, or master resource with the following command.
pcs resource meta resource_id | group_id | clone_id | master_id meta_options
In the following example, there is an existing resource named
dummy_resource. This command sets the failure-timeout meta option to 20 seconds, so that the resource can attempt to restart on the same node in 20 seconds.
# pcs resource meta dummy_resource failure-timeout=20s
After executing this command, you can display the values for the resource to verity that
failure-timeout=20s is set.
# pcs resource show dummy_resource
Resource: dummy_resource (class=ocf provider=heartbeat type=Dummy)
Meta Attrs: failure-timeout=20s
Operations: start interval=0s timeout=20 (dummy_resource-start-timeout-20)
stop interval=0s timeout=20 (dummy_resource-stop-timeout-20)
monitor interval=10 timeout=20 (dummy_resource-monitor-interval-10)
For information on resource clone meta options, see Section 9.1, “Resource Clones”. For information on resource master meta options, see Section 9.2, “Multistate Resources: Resources That Have Multiple Modes”.
