2. Linux Basics

- Step 1
Install Oracle VM virtual box 6.1
https://www.virtualbox.org/

VM is an environment where we can host different systems.

- Step 2:
Install ISO Centos:
http://isoredirect.centos.org/centos/7/isos/x86_64/

- Step 3:
Configuration:

• Click on New
• Give any name ex. Centos
• Type: Linux
• Version: Red Hat 64 bit

memory size: atleast 2GB

- Step 4:
create a disk drive option
Hard disk file type: VDI(Virtual Disk image)

- Step 5:
Storage on physical hard disk: dynamically allocated

File location and size:
around 20GB

Click on Start of Centos, browse and import ISO Centos, Add.
select first option on screen as
Install CentOS 7

Linux OS:

• Open source Operating System
• software update,customization,distribution can be done in Linux.
• Free to use
• Cost of Linux is low
• Large community support

Linus Sytem: package(Deb-RPM-YUM) --repo
RPM -RedHat Package Manager
YUM - Yellow Dog Updater

RPM

• RPM can install only single package at a time.
• RPM cannot resolve dependencies
• cannot rollback with RPM

YUM

• Yum can install multiple packages at a time
• Yum can resolve dependencies automatically
• Yum can rollback any changes

Assignment: Install all dependency for making Centos full screen
https://www.youtube.com/watch?v=Eo-DjIIwPvw

Update centos

sudo yum -y update

Hypervisor:
A hypervisor, also known as a virtual machine monitor or VMM, is software that creates and runs virtual machines (VMs). A hypervisor allows one host computer to support multiple guest VMs by virtually sharing its resources, such as memory and processing.

Types of Hypervisor:
between OS and Hardware
between OS and OS

Right click -> open new terminal
Linux Commands:

• whoami

• ls(list)

cd ~
whoami
pwd
ls
ls -l
cd Desktop
mkdir inueron
cd inueron
touch devops.txt
ls -l devops.txt
chmod 777 devops.txt


User Group Other
7 7 7

Read - 4
Write - 2
Execute - 1
4+2+1 =7 (all)

chmod 4

Login as root user
sudo su