Summary of "Lecture 1 | Installation of Centos LINUX 7 | Oracle VirtualBox | Hypervisors | Virtual Machines"

Summary of Lecture 1: Installation of CentOS Linux 7

In this lecture, the instructor provides a comprehensive guide on installing CentOS Linux 7 using Oracle VirtualBox, discussing key concepts related to hypervisors and the installation process itself.

Main Ideas and Concepts:

Partitioning Hard Disk:
- Importance of partitioning during the installation of Linux.
- Recommended partitions: boot, root, and swap.
Hypervisors:
- Definition and classification of hypervisors:
  - Class 1 Hypervisor: Installed directly on hardware (bare metal).
  - Class 2 Hypervisor: Installed on top of an operating system (e.g., VirtualBox).
- Performance and security differences between Class 1 and Class 2 hypervisors.
Installation Process:
- Download and install Oracle VirtualBox from its official site.
- Create a new virtual machine for CentOS 7 within VirtualBox.
- Allocate system resources (RAM, CPU, hard disk space) for the virtual machine.
- Load the CentOS ISO image for installation.
- Configure network settings and ensure internet connectivity for the virtual machine.
- Select installation options, including language, time zone, and installation type (minimal vs. server with GUI).
- Partition the hard disk and configure mount points.
Post-Installation:
- Set the root password and create a user account.
- Understand the importance of the root user and the login process post-installation.
- Instructions on how to exit the virtual machine and return control to the host operating system.

Detailed Instructions:

Installing Oracle VirtualBox:
- Go to the official Oracle VirtualBox website.
- Download the latest version for your operating system (Windows, Mac, etc.).
Creating a New Virtual Machine:
- Open VirtualBox and click on "New".
- Name the virtual machine (e.g., CentOS 7).
- Select the type (Linux) and version (Red Hat).
- Allocate RAM (recommended minimum is 768 MB).
- Set the hard disk space (default is 20 GB).
- Choose to create a new virtual hard disk.
Configuring the Virtual Machine:
- Go to settings to configure network adapters (select bridge adapter for internet).
- Load the CentOS ISO image in the storage section.
Installation Steps:
- Start the virtual machine and select installation options (verify media, graphical interface).
- Choose language and time zone settings.
- Select installation type (Server with GUI recommended).
- Partition the hard disk:
  - Create a boot partition (200 MB).
  - Create a root partition (15,000 MB).
  - Create a swap partition (remaining space).
- Start the installation process and set up user accounts.
Post-Installation:
- Remove the ISO image from the virtual machine settings.
- Log in with the root account or the user account created during installation.