CentOS 5
Sponsored Link

Monitor DRBD
2008/08/15
  Configure 2 DRBD servers as cluster.

[1] Set basic configuration of HeartBeat on (1) section.

[2] Set basic configuration of DRBD on DRBD section.

[3] Configure like below on both Host. (DRBD is already runnning on both server.)
[root@www1 ~]#
/etc/rc.d/init.d/heartbeat stop

Stopping High-Availability services:
[  OK  ]
[root@www1 ~]#
cd /var/lib/heartbeat/crm

[root@www1 crm]#
rm -f cib.xml.*

[root@www1 crm]#
vi cib.xml


 <cib generated="true" admin_epoch="0" epoch="1" have_quorum="true" ignore_dtd="false" ccm_transition="2" num_peers="2" cib_feature_revision="2.0" dc_uuid="f8719a77-70b4-4e5f-851b-dafa7d65d3a2" num_updates="4" cib-last-written="Sun Jun 15 05:04:30 2008">
   <configuration>
     <crm_config>
       <cluster_property_set id="cib-bootstrap-options">
         <attributes>
           <nvpair id="cib-bootstrap-options-dc-version" name="dc-version" value="2.1.3-node: 552305612591183b1628baa5bc6e903e0f1e26a3"/>
         </attributes>
       </cluster_property_set>
     </crm_config>
     <nodes>
       <node id="2bbd6408-ec01-4b8c-bb8e-207237af3a99" uname="www1.server-linux.info" type="normal"/>
       <node id="f8719a77-70b4-4e5f-851b-dafa7d65d3a2" uname="www2.server-linux.info" type="normal"/>
     </nodes>
     <resources/>
<= remove

# add these lines for DRBD

     <resources>
       <master_slave id="ms-drbd0">
         <meta_attributes id="ma-ms-drbd0">
           <attributes>
             <nvpair id="ma-ms-drbd0-1" name="clone_max" value="2"/>
             <nvpair id="ma-ms-drbd0-2" name="clone_node_max" value="1"/>
             <nvpair id="ma-ms-drbd0-3" name="master_max" value="1"/>
             <nvpair id="ma-ms-drbd0-4" name="master_node_max" value="1"/>
             <nvpair id="ma-ms-drbd0-5" name="notify" value="yes"/>
             <nvpair id="ma-ms-drbd0-6" name="globally_unique" value="false"/>
           </attributes>
         </meta_attributes>
         <primitive id="drbd0" class="ocf" type="drbd" provider="heartbeat">
           <instance_attributes id="ia-drbd0">
             <attributes>
              
# specify resource "value=" that is set on DRBD section

               <nvpair id="ia-drbd0-1" name="drbd_resource" value="r0"/>
             </attributes>
           </instance_attributes>
         </primitive>
       </master_slave>
       <primitive id="fs0" class="ocf" type="Filesystem" provider="heartbeat">
         <meta_attributes id="ma-fs0">
           <attributes/>
         </meta_attributes>
         <instance_attributes id="ia-fs0">
           <attributes>
             <nvpair id="ia-fs0-1" name="fstype" value="ext3"/>
            
# specify mount point "value=xxx"

             <nvpair id="ia-fs0-2" name="directory" value="/mnt/drbd"/>
            
# specify device "value=xxx" that is set on DRBD section

             <nvpair id="ia-fs0-3" name="device" value="/dev/drbd0"/>
           </attributes>
         </instance_attributes>
       </primitive>
     </resources>
     <constraints>
       <rsc_location id="rsc_location_group_1" rsc="ms-drbd0">
         <rule id="prefered_location_group_1" role="Master" score="100">
          
# specify primary node "value=xxx" that is set on DRBD section

           <expression id="prefered_location_group_1_expr" attribute="#uname" operation="eq" value="www1.server-linux.info"/>
         </rule>
       </rsc_location>
       <rsc_order id="drbd0_before_fs0" from="fs0" action="start" to="ms-drbd0" to_action="promote"/>
       <rsc_colocation id="fs0_on_drbd0" to="ms-drbd0" to_role="master" from="fs0" score="infinity"/>
     </constraints>
     <constraints/>  
<= remove

   </configuration>
 </cib>

[root@www1 crm]#
/etc/rc.d/init.d/heartbeat start

Starting High-Availability services:
[  OK  ]
[4] Run crm_mon after some time passed, then following result is shown, it's OK. DRBD is controled by HeartBeat and DRBD disk is mounted automatically on primary node like below.
[root@www1 crm]#
crm_mon -i 3

Defaulting to one-shot mode
You need to have curses available at compile time to enable console mode

============
Last updated: Wed Jun 18 23:16:41 2008
Current DC: www2.server-linux.info (f8719a77-70b4-4e5f-851b-dafa7d65d3a2)
2 Nodes configured.
2 Resources configured.
============

Node: www1.server-linux.info (2bbd6408-ec01-4b8c-bb8e-207237af3a99): online
Node: www2.server-linux.info (f8719a77-70b4-4e5f-851b-dafa7d65d3a2): online

Master/Slave Set: ms-drbd0
drbd0:0
(heartbeat::ocf:drbd):
Master www1.server-linux.info

drbd0:1
(heartbeat::ocf:drbd):
Started www2.server-linux.info

fs0        (heartbeat::ocf:Filesystem):
Started www1.server-linux.info


[root@www1 crm]#
df -h

Filesystem
Size
Used
Available
Use%
Mounted on

/dev/hda1
20G
2.7G
17G
14%
/

tmpfs
513M
0
513
0%
/dev/shm

/dev/drbd0
1008M
18M
940M
2%
/mnt/drbd
[5] Shutdown HeartBeat on primary server and verify if HeartBeat works or not.
[root@www1 crm]#
/etc/rc.d/init.d/heartbeat stop

Starting High-Availability services:
[  OK  ]
  Run crm_mon on secondary. DRBD disk is mounted automatically like below. HeartBeat works normally.
[root@www2 crm]#
crm_mon -i 3

Defaulting to one-shot mode
You need to have curses available at compile time to enable console mode

============
Last updated: Wed Jun 18 23:32:11 2008
Current DC: www2.server-linux.info (f8719a77-70b4-4e5f-851b-dafa7d65d3a2)
2 Nodes configured.
2 Resources configured.
============

Node: www1.server-linux.info (2bbd6408-ec01-4b8c-bb8e-207237af3a99): OFFLINE
Node: www2.server-linux.info (f8719a77-70b4-4e5f-851b-dafa7d65d3a2): online

Master/Slave Set: ms-drbd0
drbd0:0
(heartbeat::ocf:drbd):
Master www2.server-linux.info

drbd0:1
(heartbeat::ocf:drbd):
Stopped

fs0        (heartbeat::ocf:Filesystem):
Started www2.server-linux.info


[root@www2 crm]#
df -h

Filesystem
Size
Used
Available
Use%
Mounted on

/dev/hda1
15G
1.6G
13G
12%
/

tmpfs
513M
0
513
0%
/dev/shm

/dev/drbd0
1008M
18M
940M
2%
/mnt/drbd
[6] Start HeartBeat again on primary server and verify if HeartBeat works or not.
[root@www1 crm]#
/etc/rc.d/init.d/heartbeat start

Starting High-Availability services:
[  OK  ]
  Run crm_mon on secondary. DRBD disk is mounted automatically again like below. HeartBeat works normally.
[root@www1 crm]#
crm_mon -i 3

Defaulting to one-shot mode
You need to have curses available at compile time to enable console mode

============
Last updated: Wed Jun 18 23:37:25 2008
Current DC: www2.server-linux.info (f8719a77-70b4-4e5f-851b-dafa7d65d3a2)
2 Nodes configured.
2 Resources configured.
============

Node: www1.server-linux.info (2bbd6408-ec01-4b8c-bb8e-207237af3a99): OFFLINE
Node: www2.server-linux.info (f8719a77-70b4-4e5f-851b-dafa7d65d3a2): online

Master/Slave Set: ms-drbd0
drbd0:0
(heartbeat::ocf:drbd):
Slave www2.server-linux.info

drbd0:1
(heartbeat::ocf:drbd):
Master www1.server-linux.info

fs0        (heartbeat::ocf:Filesystem):
Started www1.server-linux.info


[root@www1 crm]#
df -h

Filesystem
Size
Used
Available
Use%
Mounted on

/dev/hda1
20G
2.7G
17G
14%
/

tmpfs
513M
0
513
0%
/dev/shm

/dev/drbd0
1008M
18M
940M
2%
/mnt/drbd
Matched Content
 
Tweet