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Tuesday, 12 July 2016

RHEL Cluster Cheet Sheet

RHEL Cluster Cheet Sheet



Linux cluster commands

Checking status of the cluster:
# clustat
# clustat -m Display status of and exit
# clustat -s Display status of and exit
# clustat -l Use long format for services

# cman_tool status Show local record of cluster status
# cman_tool nodes Show local record of cluster nodes
# cman_tool nodes -af


# ccs_tool lsnode List nodes
# ccs_tool lsfence List fence devices

# group_tool displays the status of fence, dlm and gfs groups
# group_tool ls displays the list of groups and their membership

Resource Group Control Commands:
clusvcadm -d Disable
clusvcadm -e Enable
clusvcadm -e -F Enable according to failover domain rules
clusvcadm -e -m Enable on
clusvcadm -r -m Relocate to member>
clusvcadm -R Restart a group in place.
clusvcadm -s Stop

Resource Group Locking (for cluster Shutdown / Debugging):
clusvcadm -l Lock local resource group manager.
This prevents resource groups from
starting on the local node.
clusvcadm -S Show lock state
clusvcadm -Z Freeze group in place
clusvcadm -U Unfreeze/thaw group

clusvcadm -u Unlock local resource group manager.
This allows resource groups to start on the local node.

clusvcadm -c Convalesce (repair, fix) resource group.
Attempts to start failed, non-critical resources within a resource group.


Cluster Command Quick Reference

1)Cluster status
clustat Display the status of the cluster as viewed from the executing host

2)Cluster services administration
clusvcadm Manage services across the cluster.

3)Move a service to another node
clusvcadm –r -m

4)Stop a service
clusvcadm –d

5)Start a service
clusvcadm –e

6)Cluster configuration system
ccs_tool Online management of cluster configuration

7)Update the cluster.conf file across the cluster
ccs_tool update /etc/cluster/cluster.conf
8)Cluster Management
cman_tool Manage cluster nodes and display the current state of the cluster

9)Display status
cman_tool status

10)Fencing tools

11)Eject a node from the cluster
fence_node

12)Print fence debug messages
fence_tool dump

Thanks

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