RSINFOMINDS: 02/01/2014

About Us

RSInfoMinds, a web based IT Training and Consultancy firm. It is established with high dreams in training people in IT Infrastructure Field. We provide Online and Class Room training in various fields of IT Infrastructure Management.

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We are specialized in the below courses:

Redhat Linux Admin Redhat Linux Cluster

Redhat Virutualization IBM AIX Admin

IBM AIX Virtualization IBM AIX Cluster

HP Unix Admin HP Unix Cluster

HP Unix Virtualization Shell Scripting

Veritas Volume Manager Veritas Cluster

Oracle Core DBA VMWare

We provide training in such a way, So that you get in depth knowledge on the Courses you look for.

And we ensure you are very confident from each and every Techincal aspect that the IT Industry needs and expects from you.

We also conduct Workshops on the latest technology and the real time faculties sharing their work experiences to make you the best.

Friday 21 February 2014

Add a node to a 2 Node Cluster : RHEL

[root@node1 ~]# clustat
Cluster Status for oracle @ Thu Feb 20 00:56:32 2014
Member Status: Quorate

Member Name ID Status
------ ---- ---- ------
node1 1 Online, Local
node2 2 Online

[root@node1 ~]#

[root@node2 ~]# clustat
Cluster Status for oracle @ Mon Feb 17 07:20:55 2014
Member Status: Quorate

Member Name ID Status
------ ---- ---- ------
node1 1 Online
node2 2 Online, Local

[root@node2 ~]#

I am going to add a new node called "node3". This can be done from LUCI or CLI.

From the primary node, update the cluster.conf

[root@node1 ~]# vi /etc/cluster/cluster.conf
[root@node1 ~]# cat /etc/cluster/cluster.conf
<?xml version="1.0"?>
<cluster config_version="15" name="oracle">
<clusternodes>
<clusternode name="node1" nodeid="1"/>
<clusternode name="node2" nodeid="2"/>
<clusternode name="node3" nodeid="3"/>
</clusternodes>

[root@node1 ~]# cman_tool version -r
[root@node1 ~]# clustat
Cluster Status for oracle @ Thu Feb 20 01:05:07 2014
Member Status: Quorate

Member Name ID Status
------ ---- ---- ------
node1 1 Online, Local
node2 2 Online
node3 3 Offline

[root@node1 ~]#

Now start the CMAN service on node3:

[root@node3 ~]# service cman start

Starting cluster:

Checking if cluster has been disabled at boot... [ OK ]

Checking Network Manager... [ OK ]

Global setup... [ OK ]

Loading kernel modules... [ OK ]

Mounting configfs... [ OK ]

Starting cman... [ OK ]

Waiting for quorum... [ OK ]

Starting fenced... [ OK ]

Starting dlm_controld... [ OK ]

Starting gfs_controld... [ OK ]

Unfencing self... [ OK ]

Joining fence domain... [ OK ]

[root@node3 ~]#

[root@node3 ~]# clustat

Cluster Status for oracle @ Wed Feb 19 08:52:40 2014

Member Status: Quorate

Member Name ID Status

------ ---- ---- ------

node1 1 Online

node2 2 Online

node3 3 Online, Local

[root@node3 ~]#

Simple ...:)

Sunday 9 February 2014

Flushing The Multipath

# multipath -F : Command to Flush the multipath table, after the LUN's are unassigned from the server.

Note: After flushing the path, you may still face "tur checker error".

Monday 3 February 2014

Linux Interview Questions

1) Linux Boot Process.
2) Linux Storage Lun Detection.
3) How to see WWID of a Lun.
4) Crash Dump Configuration.
5) Explain free command output.
6) How to view HBA WWPN in linux.
7) Cluster status command
8) Resource Group fail over in Linux.
9) Bonding Types
10) Patching.

Please join my site to get the answers with example.