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~~~~~~~~~~~~~~~~~~~~~~~
Day 2: 14th July 2024
~~~~~~~~~~~~~~~~~~~~~~~			
	
	
	Introduction to Cloud Platform 
	
	AWS Free Tier Account 
	
	Login to AWS Console
	
	Create EC2 Instances(Virtual Machines)
	
	Linux 
	


	On-premises Environments
	
		Servers,Storage,Networking,Dbase
	
		Software - Cost 
		
	Cloud Environments :::
	
		Core Linux Administration :::
		
			Linux Machine 
			
			Hypervisor & VMs - 16 GB of RAM 2CPU 
			
			
			Create AZURE / AWS - Account 
			
				Create VMs 
				
				
			Telecomm - SP1 -- Introduce a new service to their customers -> ASAP! IT Services
								Build Servers/Test Servers/Deployment servers
								
			SP2 
			
			
	
	AWS Free Tier Account -- https://aws.amazon.com/console/
	
		Active Email_ID & Mobile Number 
		Active Credit/Debit Card - enabled with International Trancsaction
		12 Months free tier account - 
		
		
	
	Login to AWS Console
	
	Create EC2 Instances(Virtual Machines)
	
	Linux 
	

	AWS Account Creation Process!
	
	https://aws.amazon.com/console/
	
	
	Login to AWS Console :::
	
		- Login as a root user (Using Email_ID & Password)		# Default
		
			(or)
			
		- IAM User 												# Not Now!
			
	In AWS Cloud platform :::

		Regions 	(Locations)
		
			Availability Zones (Data Centers)
				
				
	Upon Login to AWS Console 
		- Choose set AWS Region.
		- Create the resources within that regions
		
		
	Billing Management :::
	
		Free Tier ::
		
		
	Create EC2 Instances(Virtual Machines) :::
	
	Select EC2 Service 
	
	From EC2 Dashboard - Select Launch Instance
	
	
	How to Access the remote service?
	
	www.gmail.com
	
		- Web Browser 
		- Authentication - UserName & Password 
		
		
	AWS Platform 
		EC2 Instance (Virtual Machine) 
		
		- SSH Connection Protocol
		
		- Authentication Types :
			- Password Based Authentication
			- Token Based Authentication
			- Key Based Authentication
				- Public key and private key 
			- Passwordless Authentication
	
	
		1 VM == 750 Hrs/Month

		10 VMs == 75 Hrs/Month
		
		It is always recommended to STOP the EC2 Instance if it is not in use!
	
	
	AMI 
	
		Choose : Ubuntu v22.04 LTS AMI
		
		
		Windows 
		Linux 
		Mac 
		
		
		Linux based AMI :::
		
			Linux Open-Source Operating System :
				
				UNIX OS
				
				- Linux Distribution 
										Package Manager (Used to Install/Uninstall/Upgrade the packages)
					Debian/Ubuntu			apt-get / apt 
					Centos/RHEL				yum 
					Fedora					dnf
					Previous version of Fedora uses yum package manager
					
					
				Window OS --> 
				
					- Windows Installer! -> Package Manager for Windows OS 
											- Used to Install/Uninstall/Upgrade the packages ad




		Created the Instance :::
		
		Running 
		
			Instance ID (Uniquely Generated)
			
			Name/Tag (We assign)
			
			Host Name :

				Public IP Address	(Will Change everytime we restart the Instance)

				Private IP Address 	(Constant IP Address, exist till you terminate the Instance)



	How to Connect to  EC2 Instances :::
	

		- Authentication Types :
			- Password Based Authentication
			- Token Based Authentication
			- Key Based Authentication
				- Public key and private key 
			- Passwordless Authentication	
			
			
		Host_Name 
		User_Name 
		Credentials 
	
		-	EC2 Instance Connect (Thru Browser - AWS Console) 
		
		-	SSH Agents :	(Tool installed in the client machine to access Linux VMs)
				MobaXterm	- 	https://mobaxterm.mobatek.net/download.html 
							https://mobaxterm.mobatek.net/download-home-edition.html - Choose Installer Edition
							Download *.zip
							Extract & run the exec file
		
							Open MobaXterm Tool 
							Select Session - Setting
								- Remote Host :Public IP Address 
								- User Name : ubuntu
								- Advanced Setting 
									- Choose Private key check box 
										- browse thru the *.pem from downloads folder
				Putty 
			
		-	Terminal :		# Ubuntu/Mac Users 
		
		
		Create AWS Account 
		
		Login to AWS Console as a root 
		
		Goto EC2 Instance Dashboard 
		
		Create EC2 Instance 
			- Create Key Pair 
			
		Connect to EC2 Instance using EC2 Instance Connect (Thru Browser - AWS Console) 
			
		
Fundamentals of Linux Operating System ::

Overview of Linux
Linux Architecture
Linux Distributions
Basic Linux Commands
File Permission Management
User Creation
Shell Scripts
SSH and VI Utility - Remote Server Access
			
			

	Operating System ::
	
		What is an Operating System ???
		
			- Is an interface between the user application and the Hardware.
			
		Windows
		Linux 
		Mac 
		
		Android 
		
		High End computation Servers 
		
			- Reliable OS
			- Linux Based OS 
			
			OS Architecture ::
			
				Linux - Kernel is the core of Linux 
				
				Manage the Underlying Hardware, User Applications, External Resources,  
				
				It create the process 
				Each and every process runs in its own address space/volume 
				Dedicated/Isolated path
				
					OS Kernel 
						Namespace 
						Control Group 
						
						
				Executed as Command Line Utilities 
				
				Traditional Linux are CUI (Command User Interface) Based  
				
				Windows are GUI (Graphical User Interface) based  
		
		Linux Distribution :::
			
			AWS Cloud --> Ubuntu v22.04			===> 	Azure --> Ubuntu v22.04
			
			
			
			- Linux Distribution 
									Package Manager (Used to Install/Uninstall/Upgrade the packages)
				Debian/Ubuntu			apt-get / apt 
				Centos/RHEL				yum 
				Fedora					dnf
				Previous version of Fedora uses yum package manager	

				All the package Manager should be executed as a root user.
				
				
			
		Basic Linux Commands :::
		
		
		sudo -i			# To elevate the access to root level
		hostname -i
		clear
		ls 
		pwd 			# present working directory
		


~~~~~~~~~~~~~~~~~~~~~~~
Day 3: 20th July 2024
~~~~~~~~~~~~~~~~~~~~~~~			
			
Fundamentals of Linux Operating System ::

Overview of Linux
Linux Architecture
Linux Distributions
Basic Linux Commands
File Permission Management
User Creation
Shell Scripts
SSH and VI Utility - Remote Server Access



	- Linux Distribution 
							Package Manager (Used to Install/Uninstall/Upgrade the packages)
		Debian/Ubuntu			apt-get / apt 
		Centos/RHEL				yum 
		Fedora					dnf
		Previous version of Fedora uses yum package manager	
		
	Why we need Linux ???
	
		Linux OS 
		
			Install and Manage all the DevOps Tools on Linux Machines  
			
			Open-Source DevOps Tools :
			
				git,jenkins,docker,kubernetes/Prometheus/Grafana,ansible,terraform
				
				
	
	What is your role here ???
	
	
		1. Install the DevOps Tools 
		2. Manage the Tools -- Periodically Clean-up/Upgrade the tools
		3. Remote access to the servers 
					Client - Server Architecture
					
					Server 
						- Client1,2,3,4,5
						
		4. DevOps Team can Administrate the Linux Machines 
		
			1. Package Management - install/uninstall/upgrade
			2. File Management 
			3. User Management 
			4. Access Management 
			5. Remote Server Management 
			6. Process Automation 
			
	Working with Linux OS :

	- Basic Linux Commands
			
			clear 
			
			root user will have complete admin access to Linux Machine.

	- Linux Distribution 
			Package Manager (Used to Install/Uninstall/Upgrade the packages)
		Debian/Ubuntu			apt-get / apt 
		Centos/RHEL				yum 
		Fedora					dnf
		Previous version of Fedora uses yum package manager				


	1. Package Management - install/uninstall/upgrade		
		clear 				# Clean the Command 
		sudo -i				# to elevate the access to root level
								Used to execute package manager 
						
		apt update -y 		# used to update the default packages 
		
		git,maven,docker,jenkin,ansible
		
		apt install git -y

		git --version 
		
		apt install maven -y
		
		apt install tree -y
		
		apt install nginx -y
		
		apt remove git -y 

		apt upgrade git -y
		
		
	File related commands :::
	
	2. File Management 	
	
	Directory 		# Is folder - collections of files & sub-folders
		- File Access Mode
			- Read/Write/Execute
	
	
	For any user in Linux, will have a home directory
	
	pwd 			# show Present working directory
	
	cd 				# Change Directory 

	cd /			# Control will be take to the root directory at the system level 
	
	cd ~			# Control will be taken to the home directory of the user level
	
	exit 			# Used to logout from a user 

	ls 				# Used to List the files and directories of the current path
	
	echo 			# Used to print the message on terminal/Console
	
	Create the files :::
	
		1. 	echo "Hello Everyone" >> file1.txt		# Create the file 
			echo "Session1" > file.txt 
			
			cat file1.txt 							# To print the content of the file 
			
		2. touch file2.txt 							# Used to create empty file 
		
		3. vi file3.txt								# Create or edit a file using vi editor
		
		
			Press i 								# goto insert mode 
			Type the file contents
			
			Press ===>		esc key 
			Type 	===>  	:wq						# Save and Exit from vi editor 
			Type 	===>  	:q!						# Exit from vi editor without saving the changes
			
		
	ll				# Long List
			
	mkdir 			# Make / Create Directory
	
	cd ..			# go back to previous directory
	
	
	Working with Directories ::::
	
		Hidden Files/Directories --> 
		
		all the hidden files/directories will be prefixed with .
		
		
	echo "rec1" >> .s1.txt				# Create a hidden file 
	
	mkdir .dir2							# Create Hidden Directory
	
	mv s1.txt payment.text				# Rename a file 
			
	mv s2.txt subdir1/					# Move the file from one dir to another
	
	cp s1.txt subdir1/					# Copy the file from one dir to another
	
	rm -rf subdir1/						# Remove the folder 
	
	rm file1.txt						# Remove the file 
	
	rm *.java 							# Remove Multiple files using wild-card symbol *
	
	rm file1.txt file2.txt 				# Remove multiple files 
	
	
	
	What is Deployment ??
	
		Copying the artifacts from one machine to another machine 
		
		Dev Server 		*.war
		
		Test Server 	*.war
	
	

	ll				# Long List
	
		First 1 character are used to identify the type of component and its access level 
		
		
	Project Folder -- Source Code & Program to execute
	
	
	Owner	
	
	Group of Users 
	
	Public/Common User 
	
	
	User: Dev 	- Group: Development Team
	
	
	drwxrwxr-x 2 ubuntu ubuntu 4096 Jul 20 06:35 dir1/
	
	
	drwxrwxr-x
	
	----------

	-							# Used to identify the type of component - file/directory  	
								# Possibel values are ====> '-' and 'd'
								
	 ---						# Owner : Possible values are rwx	 Read / Write / Execute 						
	 
	    ---						# User Group : Possible values are rwx	 Read / Write / Execute
		
		   ---					# Possible values are rwx	 Read / Write / Execute


	Eg.:
	
	payment.java 
	
	
	-rwx------					# Owner of the file can have Read / Write / Execute access.

	-rw-------					# Owner of the file can have Read and  Write access.

	-rwxr-----					# Owner of the file can have Read / Write / Execute access.
								# User Group can just read the file 
								
	-rwxrw-r--					# Owner of the file can have Read / Write / Execute access.	
								# User Group can just read & Write the file 
								# Common user can just read the file content 
								
								
	chmod 
	
	https://chmod-calculator.com/
	
	
	
	User Management :::
	
		- How to create Users on linux Machine 
		
		- How to login to that user 
		
		- Setup the Access to that user 
		
		- Define ownership 
		
		
	DevOps :::
	
		Create some Virtual Machines :::
		
			server (VM)
				Clients (VM) 1,2,3,4,5 
				
				
		Create : devopsadmin user 
		
		Remote Server :::
		
			SSH Protocol :
			
				Host Name 
				
				User Name 
				
				User Credentials
	


		ls -a				# Used to get the list of all components including hidden files and directories


		Is SSH ::
		
			By Default :
			
				Key based authentication :::
				
					Public Key 
					
					Private Key 
					
			Password based authentication :::
			
			
		cd /etc				# Directory maintains all the packages and system properties 
		
		cat /etc/passwd		# Used to get the list of users 
		
		cat /etc/group 		# Used to get the list of user groups 
		
		
		user1 
		
		user2 
		
		dev_group
		
		Install Docker -- Container Engine 
		
		docker group 
		
		devopsadmin 
		
		Group level Access
		
		
		Create New Linux User :::

			Excute these commands as a root user:	

			#useradd devuser1
			
			useradd devuser2 -s /bin/bash -m -d /home/devuser2		# Create User 
			
			su - devuser2											# Login to that user
			
		How to create password for Linux users 
				
				passwd <user_id>
				
				passwd devuser2										# Create Password 
				
				New Password :									 	# Is a Hidden field Enter valid password 			
				
				Re-Type New Password : 								# Is a Hidden field re-type & confirm password