As per Oracle the Oracle Enterprise Linux is an open-source operating system available under the GNU General Public License. The only operating system to offer zero-downtime patching, Oracle Linux is optimized for Oracle hardware and software and provides enterprises with the benefits of the latest Linux innovations including rigorous testing with real-world workloads.

Oracle Linux can be installed either from a CD-ROM drive or over the network using a pre-boot execution environment (PXE). To install Oracle Linux using the CD-ROM or PXE boot method, visit the Oracle eDelivery Linux portal to download the Oracle Linux media. The Oracle Linux media is delivered as a zip file that contains a CD or a DVD with an Oracle Linux ISO file. The Oracle Linux ISO file can be burned as a bootable disk and used to install Oracle Linux from a CD-ROM drive.

For this how I will be using Oracle Enterprise Linux 6 update 1 ISO.

Steps to install Oracle Enterprise Linux 6 – Graphical (GUI) Mode

Step 1: Start your Oracle VM Virtual Box Manager, create an VM for Oracle Enterprise Linux (OEL) and boot the server using the DVD ISO image. At the boot prompt, press the Enter key to start the Oracle Linux installation in graphical mode
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Step 2: On the Disk Found window, you can perform a media test to validate the integrity of the installation media. The media test is optional and time consuming. In this example, we will not perform a media test.

Press the tab key to select the Skip key. Once the Skip key is selected, press the Enter key to proceed.
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Step 3: On the Welcome screen, click the Next button
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Step 4: On the Language Selection screen, select the preferred language that will be used during the installation process. In this example, select the default language, English (English).

Accept the default English (English) language selection, then click the Next button
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Step 5: On the Keyboard Selection screen, select the desired keyboard setting for the system. In this example, select the default keyboard selection, US English.

Accept the default US English keyboard selection, then click the Next button
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Step 6: On the Storage Device screen, you can select the Basic Storage Devices or the Specialized Storage Devices options.
In this example, accept the default Basic Storage Devices option, click the Next button.
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Step 7: A disk initialization Warning dialogue box will appear after you make your Storage Device selection. Click the Re-initialize button to proceed with the installation.

Step 8: On the Networking configuration screen, you can accept the default DHCP setting or configure the networking manually. To use DHCP, accept the defaults, and click the Next button to proceed.

Click the Configure Network button to review the network configurations.
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Step 9: From the Network Connections screen, select the desired connection, i.e. eth0 and click the Edit button.
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Step 10: On the Editing System screen select the Connect automatically checkbox to enable the interface automatically start when the system is starts. To configure the networking manually, click the desired tab to configure the selected interface. Click the Apply button to save the networking setting and to return to the Network Connections screen.
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Step 11: On the Time Zone screen, select the time zone for your area by clicking your region on the map. Accept the default System clock uses UTC setting, and click the Next button to proceed.
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Step 12: On the Root Password screen enter a root password for the server, then click the Next button to proceed.
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Step 13: On the Installation Type screen, you can select the desired partitioning layout or create your own partitioning layout.
In this example, I have selected Use All Space option and click the Next button to proceed.
Note: To edit the default partitioning layout, select Review and modify partitioning layout option and click Next
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Step 14: A partition table Warning dialogue box will appear after clicking the previous Next button. Click the Write changes to disk to proceed.
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Step 15: On the Software Selection screen, you can accept the default selections or select one or more roles for the server and/or customize the entire software selection by selecting the Customize now.
Note: The default selections will not install a desktop environment.
In our example select the Basic Server installation and check the Customize now option, then click the Next button to proceed.
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Step 16: The Package Group Selection screen allows you to select the required package groups, and individual packages within the details section. When you’ve made your selection, click the Next button. If you want the server to have a regular gnome desktop you need to include the following package groups from the Desktops section:
Desktop
Desktop Platform
Fonts
General Purpose Desktop
Graphical Administration Tools
X Windows System
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Step 16: On the Installation Progress screen, you will see a dialogue box about the installation starting. Once the Starting Installation process screen is gone, the installation begins and you see the progress indicators. The installation will take a few minutes.
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Step 17: The Congratulations screen informs you that the installation is complete, and to remove your DVD media from the system and to reboot the system.
Remove the CD/DVD media from the system, and click the Next button to reboot the system.
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Step 18: After the system reboots, you will be presented with the Welcome screen. Click the Forward button to proceed.
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Step 19: On the License Agreement screen, accept the license agreement and click the Forward button to proceed.
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Step 20: On the Set Up Software Updates screen, select the desired Unbrekable Linux Network registration option, then click the Forward button to proceed
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Step 21: If you selected No from the previous screen, click the No thanks, I’ll connect later button to proceed.
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Step 22: On the Finish Update Setup screen click the Forward button to proceed.
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Step 23: On the Create User screen, you can create new system users. Click the Forward button to proceed.
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Step 24: On the Date and Time screen you can configure the Date and Time and Network Time Protocol (NTP) settings. Configure the Date and Time and Network Time Protocol settings, then click the Forward button to proceed.
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Step 25: On the Kdump screen, accept the default setting and click the Forward button to proceed.
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Step 26: On the Login screen, click on the desired user name and enter the password to access the desktop.
Once you have successfully authenticated, you have a fully functional GNOME desktop environment.
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Basic configuration after installation

Step 27: Once the installation is completed we need to turn of firewall. To turn off the firewall do the following as the “root” user.

service iptables stop
service ip6tables stop

chkconfig --level 35 iptables off
chkconfig --level 35 ip6tables off

Step 28: Set SELinux to “disabled” by editing the “/etc/selinux/config” file, making sure the SELINUX flag is set as follows.

SELINUX=disabled 

Once the changes are complete, restart the server.
Hope this helps.

Oracle Enterprise Linux 6 Installation and Setup Guide
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