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10.2.7. Clone Resource Agent Requirements

Any resource can be used as an anonymous clone, as it requires no additional support from the resource agent. Whether it makes sense to do so depends on your resource and its resource agent.
Globally unique clones do require some additional support in the resource agent. In particular, it must only respond with ${OCF_SUCCESS} if the node has that exact instance active. All other probes for instances of the clone should result in ${OCF_NOT_RUNNING} (or one of the other OCF error codes if they are failed).
Individual instances of a clone are identified by appending a colon and a numerical offset, e.g. apache:2.
Resource agents can find out how many copies there are by examining the OCF_RESKEY_CRM_meta_clone_max environment variable and which copy it is by examining OCF_RESKEY_CRM_meta_clone.
The resource agent must not make any assumptions (based on OCF_RESKEY_CRM_meta_clone) about which numerical instances are active. In particular, the list of active copies will not always be an unbroken sequence, nor always start at 0.

10.2.7.1. Clone Notifications

Supporting notifications requires the notify action to be implemented. If supported, the notify action will be passed a number of extra variables which, when combined with additional context, can be used to calculate the current state of the cluster and what is about to happen to it.

Table 10.4. Environment variables supplied with Clone notify actions

Variable Description
OCF_RESKEY_CRM_meta_notify_type
Allowed values: pre, post
OCF_RESKEY_CRM_meta_notify_operation
Allowed values: start, stop
OCF_RESKEY_CRM_meta_notify_start_resource
Resources to be started
OCF_RESKEY_CRM_meta_notify_stop_resource
Resources to be stopped
OCF_RESKEY_CRM_meta_notify_active_resource
Resources that are running
OCF_RESKEY_CRM_meta_notify_inactive_resource
Resources that are not running
OCF_RESKEY_CRM_meta_notify_start_uname
Nodes on which resources will be started
OCF_RESKEY_CRM_meta_notify_stop_uname
Nodes on which resources will be stopped
OCF_RESKEY_CRM_meta_notify_active_uname
Nodes on which resources are running
OCF_RESKEY_CRM_meta_notify_inactive_uname
Nodes on which resources are not running

The variables come in pairs, such as OCF_RESKEY_CRM_meta_notify_start_resource and OCF_RESKEY_CRM_meta_notify_start_uname and should be treated as an array of whitespace-separated elements.
Thus in order to indicate that clone:0 will be started on sles-1, clone:2 will be started on sles-3, and clone:3 will be started on sles-2, the cluster would set

Example 10.6. Notification variables

OCF_RESKEY_CRM_meta_notify_start_resource="clone:0 clone:2 clone:3"
OCF_RESKEY_CRM_meta_notify_start_uname="sles-1 sles-3 sles-2"