14.2. Transient Node Attributes

Like regular node attributes, the name/value pairs listed in the transient_attributes section help to describe the node. However they are forgotten by the cluster when the node goes offline. This can be useful, for instance, when you want a node to be in standby mode (not able to run resources) just until the next reboot.

In addition to any values the administrator sets, the cluster will also store information about failed resources here.

Example 14.2. A set of transient node attributes for node cl-virt-1

<transient_attributes id="cl-virt-1">
  <instance_attributes id="status-cl-virt-1">
     <nvpair id="status-cl-virt-1-pingd" name="pingd" value="3"/>
     <nvpair id="status-cl-virt-1-probe_complete" name="probe_complete" value="true"/>
     <nvpair id="status-cl-virt-1-fail-count-pingd:0.monitor_30000" name="fail-count-pingd:0#monitor_30000" value="1"/>
     <nvpair id="status-cl-virt-1-last-failure-pingd:0" name="last-failure-pingd:0" value="1239009742"/>
  </instance_attributes>
</transient_attributes>

In the above example, we can see that a monitor on the pingd:0 resource has failed once, at 09:22:22 UTC 6 April 2009. ^[20] We also see that the node is connected to three pingd peers and that all known resources have been checked for on this machine (probe_complete).

^[20] You can use the standard date command to print a human-readable version of any seconds-since-epoch value, for example date -d @1239009742.