vcs _ adding new node to the existing cluster _ unixadminschool

VCS : Adding new node to the existing cluster

By Ramdev

Install the VCS software manually on serv er check the packages and install the license key .

1. ./Installvcs -installonly

Configuring LLT and GAB: Create the LLT and GAB configuration files on the new node and update the files on the existing

nodes.

To configure LLT 1 Create the file /etc/llthosts on the new node. You must also update it on each of the current nodes in the

cluster.

For example, suppose y ou are adding east to a cluster consisting of north and south:

- If the file on one of the existing nodes resembles: file /etc/llthosts

0 north

1 south

- Update the file for all nodes, including the new one, resembling: file /etc/llthosts

0 north

1 south

2 east

2. Create the file /etc/llttab on the new node, making sure that line beginning set-node specifies the new node.

The file /etc/llttab on an existing node can serv e as a guide.

The following example describes a sy stem where node east is the new node on cluster number 2:

set-node east

set-cluster 2

link qfe0 qfe:0 ether link

qfe1 qfe:1 ether 3

On the new sy stem, run the command:

# /sbin/lltconfig -c

To configure GAB

1. Create the file /etc/gabtab on the new system.

- If the /etc/gabtab file on the existing nodes resembles:

# /sbin/gabconfig c

Then the file on the new node should be the same, although it is recommended to use the -c-nN option, where N is the

number of cluster nodes.

- If the /etc/gabtab file on the existing nodes resembles:

# /sbin/gabconfig -c -n2

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Then, the file on all nodes, including the new node, should change to reflect the change in the number of cluster nodes.

For example, the new file on each node should resemble:

# /sbin/gabconfig -c -n3

The -n flag indicates to VCS the number of nodes required to be ready to form a cluster before VCS starts.

2. On the new node, run the command, to configure GAB:

# /sbin/gabconfig -c

To verify GAB

1. On the new node, run the command:

# /sbin/gabconfig -a

The output should indicate that Port a membership shows all nodes including the new node. The output should

resemble:

GAB Port Memberships

====================================

Port a gen a3640003 membership 01 2

2. Run the same command on the other nodes (north and south) to verify that the Port a membership

includes the new node:



====================================


Port h gen fd57 0002 membership 01

Port h gen fd57 0002 v isible ; 2

** Adding the node to the existing cluster:

Perform these tasks on one of the existing nodes in the cluster.

To add the new node to the existing cluster;

1. Enter the command:

# haconf -makerw

2. Add the new system to the cluster:

# hasys -add east

3. Stop VCS on the new node:

# hastop -sys east

4. Copy the main.cf file from an existing node to your new node:

# rcp /etc/VRTSvcs/conf/config/main.cf east:/etc/VRTSvcs/conf/config/

5. Start VCS on the new node:

# hastart

6. If necessary, modify any new system attributes.

7. Enter the command:

# haconf -dump -makero

Starting VCS and verifying the cluster

Start VCS after adding the new node to the cluster and v erify the cluster.

To start VCS and v erify the cluster

1 . From the new sy stem, start VCS with the new sy stem added to the cluster:

# hastart

2 . Run the GAB configuration command on each node to v erify that Port a and Port h include the new node in the

membership:



===================================


Port h gen fd57 0002 membership 01 2

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Ramdev (384 Posts)

I have started unixadminschool.com ( aka gurkulindia.com) in 2009 as my own personal reference blog, and later

sometime i have realized that my leanings might be helpful for other unixadmins if I manage my knowledge-base in

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6 Responses to VCS : Adding new node to the existing cluster

1.

Jayapal on October 16, 2011 at 3:55 pm

nice one

Reply

2.

Pal on April 4, 2013 at 1:30 pm

Does we need to edit the main.cf file in exidting nodes prior to copy to new node ?

Reply

Ramdev on April 4, 2013 at 3:43 pm

you dont need to touch main.cf, if you are modifying the configuration with ha commands. but make sure you follow

the sequence

>>> open the configuration in read write mode with : haconf -makerw

>>> Make the modifications

>>> save the configuratio into main.cf : haconf -dump -makero

Reply

3.

Abhishek on April 18, 2013 at 10:12 am

Is it necessary to copy main.cf from running node to new node ? I mean, on new node, if llt and gab starts, hastart will look for

configuration files on running cluster and update its local config files accordingly .

If not,

If main.cf is copied, types.cf should also be copied. what say Rama..??

Reply

4.

Ramdev on April 19, 2013 at 3:11 am

Abhishek,

is it necessary to copy main.cf from running node to new node ?

copying is something we want do when we have more numbers of changes to replicate over. Alternatively you can copy the

running config to the local files using haconf -dump -makero., if those changes were made when the running config in write

mode.

If main.cf is copied, types.cf should also be copied. what say Rama..??

if you are not using the customized types.cf, the default one works well , because we anyway manage same level of VCS and

supporting packages for all the cluster nodes.

Reply

5. Confluence: LITP Project on May 23, 2013 at 4:14 pm

V C S: A lter C luster a nd Repla ce Fa ulty N ode

Adding and Removing Cluster Nodes Adding and remov

Reply

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