Michael: Created page with "== Preparation for HA == Once installation of the first head node has been completed, the cluster may be converted to a HA cluster. In order to do this two steps must be com..."

2014-02-27T10:46:21Z

Created page with "== Preparation for HA == Once installation of the first head node has been completed, the cluster may be converted to a HA cluster. In order to do this two steps must be com..."

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== Preparation for HA ==

Once installation of the first head node has been completed, the cluster may be converted to a HA cluster.

In order to do this two steps must be completed:

* Obtain a new HA licence and activating it
* running the cmha-setup

== cmha-setup ==

There are three steps to set up HA:

=== Preparation ===

* Power off all other nodes in the cluster to reduce the chance of problems

<syntaxhighlight>
cmsh-setup
setup
configure
</syntaxhighlight>

* A licence check is done to determine that a valid HA licence is applied
* Set up the shared interface name and IP addresses are set. 0.0.0.0 can be used for DHCP.
* Set the hostname of the passive head node
* The failover network is set up
* Other Interfaces of the passive node are configured

=== Cloneing ===

The passive head node is installed using a clone of the active head node.

# Boot the Passive node using pxe
# Select "Start Rescue Environment"
# Run the following command

<syntaxhighlight>
/cm/cm-clone-install ---failover
</syntaxhighlight>

# Enter the network interface to use
# Enter the root password
# Confirm the set up
# Cloning will then begin
# Once the cloning has finished return the the active head node and select "finalize"
# Reboot the passive node
# Check the status of the nodes:

<syntaxhighlight>
[root@bright61 ~]# cmha status
Node Status: running in active master mode

Failover status:
bright61* -> master2
backupping [ OK ]
mysql [ OK ]
ping [ OK ]
status [ OK ]
master2 -> bright61*
backupping [ OK ]
mysql [ OK ]
ping [ OK ]
status [ OK ]
</syntaxhighlight>

=== Shared Storage ===

Bright:HA setup - Revision history

Michael: Created page with "== Preparation for HA == Once installation of the first head node has been completed, the cluster may be converted to a HA cluster. In order to do this two steps must be com..."