Installing EMC PowerPath Keys

By Parthiban Ponnusamy


This describes how to configure the EMC PowerPath registration keys.

First, check the current configuration of PowerPath:

# powermt config
Warning: all licenses for storage systems support are missing or expired.
The install the keys:
# emcpreg -install
=========== EMC PowerPath Registration ===========
Do you have a new registration key or keys to enter?[n] y
Enter the registration keys(s) for your product(s),
one per line, pressing Enter after each key.
After typing all keys, press Enter again.
Key (Enter if done): P6BV-4KDB-QET6-RF9A-QV9D-MN3V
1 key(s) successfully added.
Key successfully installed.
Key (Enter if done):
1 key(s) successfully registered.
Note: the license key used in this example is not valid

HACMP Cluster Quick setup Guide

By Parthiban Ponnusamy

Use this procedure to quickly configure an HACMP cluster, consisting of 2 nodes and disk heartbeating.

Make sure you have the following in place:
  • Have the IP addresses and host names of both nodes, and for a service IP label. Add these into the /etc/hosts files on both nodes of the new HACMP cluster.
  • Make sure you have the HACMP software installed on both nodes. Just install all the filesets of the HACMP CD-ROM, and you should be good.
  • Make sure you have this entry in /etc/inittab (as one of the last entries):
    clinit:a:wait:/bin/touch /usr/es/sbin/cluster/.telinit
  • In case you're using EMC SAN storage, make sure you configure you're disks correctly as hdiskpower devices.

Changing password using script

By Parthiban Ponnusamy


In AIX, If you want to change the password for a user, and you need to script this, then the following command will be helpful. For example if you want to change the password for multiple users, or on several different servers, then here's an easy way to change the password for a user, without having to type the password on the command line prompt:

# echo "user:password" | chpasswd

Replace the  user – with your username

                   password – with the new password

you can use this command line in your scripts..

Configuring NAT with IPTABLES in Linux

By Parthiban Ponnusamy

Step-By-Step Configuration Guide for NAT with IPTABLES
This guide shows how to set up network-address-translation (NAT) on a Linux system with iptables so that the system can act as a gateway and provide internet access to multiple hosts on a local are network using a single public IP address. This is achieved by rewriting the source and/or destination addresses of IP packets as they pass through the NAT system.

Assuming that you have:
OS - Any Linux distribution
Software - Iptables
Network Interface Cards: 2

WAN = eth0 with public IP xx.xx.xx.xx (Replace xx.xx.xx.xx with your WAN IP)
LAN = eth1 with private IP yy.yy.yy.yy / (Replace yy.yy.yy.yy with your LAN IP)

Redhat Cluster Suite Video Tutorial

By Parthiban Ponnusamy

Nice Video for Redhat Cluster Suite Installation and Configuration..