Oracle Linux 7.8 Installation

Oracle Linux 7 (update 8) installation guide

This article provides a step by step guidance for performing a basic installation of Oracle Linux 7 (x86 64 bit)

Server Installation:

Ones the ".iso" image is loaded and machine starts, below is the first screen you will see.
Hit on "Return" (Enter)

Choose English (United States)
Click "Continue"

Click on "Installation Destination" (Under SYSTEM)

You should see below window and you may just have to click on "Done". By doing this, you will be choosing "Automatically configure partitioning"
Hard disk size and name information will appear by default and this is picked up while setting up the VM machine.

Then click on "Software Selection" (Under SOFTWARE). You will see below screen by doing this.
Choose "Server with GUI" from Base Env. And "Compatibility Tools" and "Development Tools" from Add-Ons.

Click on "Begin Installation"

While the installation begins, you will get a screen that prompts for setting a "ROOT" password and also create an Administrator ID as well.

Once the password setup and user creation is done, it should look like below.

Once the installation is done, click "Reboot".

Accept license agreement.

Choose the language you want. I have chosen English.

Choose the Keyboard layout, click "Next"

Location services is not required. Turn it off.

Skip

All good. We have successfully installed and logged into our Linux server's Desktop. Reboot the server ones.

Network Config:

Let's configure the network. Click on Applications --> System Tools --> Settings

Click on edit Settings.
For standalone database server you should see only 1 Ethernet. Below screen shows 3 Ethernet ports which we will be using for RAC installation.

Click on "IPv4" and lets setup manual IP configuration
Here 192.168.56 is our subnet from the initial adapter configuration we did while setting up VirtualBox VM.
Choose the Address, Net-mask & Gateway as shown in the below screen shot. You may choose to change IPs as you wish. Make sure you use right subnet and gateway configuration.
Populate DNS as 192.168.0.10.
Click on "Apply"

Make sure "Connect automatically" is enabled so every time server reboots, it reserves this IP address.
Click "Apply"

Open Terminal --> su -
systemctl restart network --> This restarts network adaptor in your server.
ifconfig --> You should be able to see allocated IP.
You can also open a Putty from your desktop and try to connect to the server

Firewall:

We may not need firewall for our Lab setup so let's disable it.

$ systemctl stop firewalld

$ systemctl disable firewalld

SELinux:

Security-Enhanced Linux (SELinux) is a security architecture for Linux® systems that allows administrators to have more control over who can access the system. For us to install Oracle software, we may have to ease out this security layer.

To do this edit the file "/etc/selinux/config" file.

Set the flag as "permissive"

SELINUX=permissive