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HA Cluster (High Availability)
RHEL5 or RHEL 6 was used RGMANAGER.
But RHEL 7 was adopted Pacemaker. Check Pacemaker CLI Commands Cheet Sheat
# yum install cman rgmanager
mkqdisk -c DEVICE -l QUORUMNAME #example mkqdisk -c /dev/mapper/mpath5 -l quorum mkqdisk -c /dev/sdb1 -l quorum
mkqdisk -L <- -L : List mkqdisk -d -L <- -d : debug（Check Last update, Master)
| Operation | Commands | Note |
|---|---|---|
| Check Cluster | clustat -l cman_tool status cman_tool nodes | |
| Check QuorumDisk | mkqdisk -d -L | -d : debug -L : List |
| Check cluster.conf | ccs_config_validate | |
| Check cluster | ccs_config_dump | |
| Check cluster.conf | rg_test test /etc/cluster/cluster.conf | |
| Check cluster | rg_test noop /etc/cluster/cluster.conf start service SERVICE_NAME |
| Operation | Commands | Note |
|---|---|---|
| start/stop Qdisk | /etc/init.d/qdiskd start /etc/init.d/qdiskd stop | |
| start/stop fenced | /etc/init.d/fenced start /etc/init.d/fenced stop | |
| start/stop cman | /etc/init.d/cman start /etc/init.d/cman stop | |
| start/stop rgmanager | /etc/init.d/rgmanager start /etc/init.d/rgmanager stop |
After rgmanager started with autostart=“0”.
| Operation | Commands | Note |
|---|---|---|
| Updating the cluster configuration (deploied cluster.conf from active server to standby server) | ccs_tool update /etc/cluster/cluster.conf (RHEL5) cman_tool version -r (RHEL6) | |
| enable/disable SERVICE after rgmanager started. | clusvcadm -e SERVICE_NAME ← enable clusvcadm -d SERVICE_NAME ← disable clusvcadm -e SERVICE_NAME -m NODE clusvcadm -d SERVICE_NAME -m NODE | -e : enable -d : disable -m : member |
| manually fail over | clusvcadm -r SERVICE_NAME | -r : relocate |
| test fence | cman_tool kill -n NODE |
both node
# /etc/init.d/qdiskd start # /etc/init.d/fenced start # /etc/init.d/cman start # clustat -l # /etc/init.d/rgmanager start # clustat -l
both node
# /etc/init.d/cman start # clustat -l # /etc/init.d/rgmanager start # clustat -l
# cman_tool nodes Node Sts Inc Joined Name 1 M 548 2010-09-28 10:52:21 node-01.example.com 2 M 548 2010-09-28 10:52:21 node-02.example.com 3 M 544 2010-09-28 10:52:21 node-03.example.com