Ensure that your system meets installation, memory, and disk requirements.
You must have root authority to perform the installation.
The DB2 product image must be available
you must manually create required DB2 users before you start the DB2 installation.

Log on to the system as a user with root authority.
Change to the directory where the DB2 database product CD is mounted
If you downloaded the DB2 database product image, you must decompress and untar the product file.
Untar the product file by using this command : abc@inst$ tar xvf product.tar
Enter the ./db2_install command from the directory where the product image resides to start the DB2 Installation
DB2 database product will be installed, by default, in one of the following directories: /opt/ibm/db2/V9.7
The installation logs, db2setup.log and db2setup.err will be located, by default, in the /tmp directory.

Applying DB2 licenses by using this command

db2licm -a db2ese_c.lic

DB2 DBA STUFF