8.2.4. Configurarea Evacuării Forțate în CMAN

We configure the fence_pcmk agent (supplied with Pacemaker) to redirect any fencing requests from CMAN components (such as dlm_controld) to Pacemaker. Pacemaker’s fencing subsystem lets other parts of the stack know that a node has been successfully fenced, thus avoiding the need for it to be fenced again when other subsystems notice the node is gone.

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Configurarea de dispozitive reale de evacuare forțată în CMAN va rezulta în evacuarea forțată de mai multe ori a nodurilor pe măsură ce părți diferite ale stivei detectează că un nod lipsește sau a eșuat.

The definition should be placed in the fencedevices section and contain:

 <fencedevice name="pcmk" agent="fence_pcmk"/>

Each clusternode must be configured to use this device by adding a fence method block that lists the node’s name as the port.

 <fence>
   <method name="pcmk-redirect">
     <device name="pcmk" port="node_name_here"/>
   </method>
 </fence>

Punând totul la un loc, avem:

cluster.conf pentru un cluster format din două noduri cu evacuare forțată

<?xml version="1.0"?>
<cluster config_version="1" name="mycluster">
  <logging debug="off"/>
  <clusternodes>
    <clusternode name="pcmk-1" nodeid="1">
      <fence>
        <method name="pcmk-redirect">
          <device name="pcmk" port="pcmk-1"/>
        </method>
      </fence>
    </clusternode>
    <clusternode name="pcmk-2" nodeid="2">
      <fence>
        <method name="pcmk-redirect">
          <device name="pcmk" port="pcmk-2"/>
        </method>
      </fence>
    </clusternode>
  </clusternodes>
  <fencedevices>
    <fencedevice name="pcmk" agent="fence_pcmk"/>
  </fencedevices>
</cluster>