Install Grid Agent from 11g OEM

To install Agent on the oracle linux server

Go to Deployments TAB from 11g Grid control page

Click on Install Agent, then the below screen will be appeared

Click on the links which you want to perform, here I click on Fresh install

NOTE: If we want to upgrade agent from 10g to 11gr1 then simply click on Upgrade agent, so no need to install 11g agent on the server it will automatically install 11g and upgrade from 10g to 11g.

Fill all the fields according to the environment.

Here you need to know the Management Server Registration Password  (OMS password) to continue.

Once done verify from the server : ./emctl status agent

Verify from grid control, it should show new oracle linux HOST

Run the .../agent11g/root.sh script (as root) as soon after installation is complete (or) you can check the "run root.sh" box if you have root access