Start the installation and select your language etc. When you arrive at the Disk Partitioning screen, manually define you disk partitions using Disk Druid. You can implement RAID 0,1,5 at this time however you must ensure that you meet the minimum disk space requirement on mount points that you will use for ORACLE_HOMEs as per the table earlier in the chapter. Also ensure sufficient /tmp and swap space are defined.
When you get to the Network Configuration Screen, it is recommended that you assign a static IP address instead of using DHCP. However if you require the use of DHCP you must configure the host to resolve the host name using the local loopback in the /etc/hosts file. We will discuss this later.
The next screen is the Firewall configuration screen. If the server is behind a firewall then select “No Firewall”. If the server is not behind a firewall and you want to use the OS firewall, I recommend that you still select “No Firewall” and configure the firewall after the application server is installed. If the firewall is active you must ensure that the ports needed by the installer are open or the installation will have problems. Once the installation is completed, you can get a list of used ports from the Application Server Control website and then configure the firewall.
Read more here:
http://www.dba-oracle.com/application_server/t_app_server_redhat.htm
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