MultiCloud Classroom notes 17/Sep/2024

Authentication into Virtual machines

• Linux Operating Systems:
  • Password Based Authentication
  • Key Based Authentication
• Windows Operating Systems:
  • Password Based Authentication

AWS

• AWS By default allows only key based authentications

Azure

• Azure supports both key based and password based authentications

What is key based authentication (SSH)

• We create a key pair:
  • private key
  • public key
• While login in to servers we will have private key and server will have public key
• We can generate a key pair in your system by executing ssh-keygen a key pair will be created in <home-dir>/.ssh/ with keys id_rsa which is private key and id_rsa.pub which is public key
• AWS also generates a key pair, in this cases aws will store public key and gives you back the private key with .pem extension
• Azure also generates a key pair, in this cases Azure will store public key and gives you back the private key with .pem extension
• Both AWS and Azure also support importing your public keys

Activity 1: Create a key pair from AWS

• Steps: Navigate to key pairs in EC2 dashboard (Region of your choic)
  
  
  
  
  

Activity 2: Import a public key into AWS

• Navigate to keypairs and import
  
  
  

Activity 3: Create a key pair from Azure

• In Azure we have a service called as ssh_keys
  
  
  
  
  
  
  

Activity 4: Import a public key into Azure

• We can also import our key
  
  
  
  
  

Distributions in Linux

Activity 5: Create a ubuntu 22.04 based ec2 instance with public ip

• my choices:
  • region: mumbai
  • size: t2.micro
  • keypair: my_idrsa
  • vpc: default
  • subnet: any
  • security group (creating a security group)
• Security group: will have only 22 port opened and can be accessed from anywhere (0.0.0.0/0)
  
  
  
  
• Create an ec2 instance
  
  
  
  
  
  
• In AWS, AMI i.e. image will have a default user
  • ubuntu AMIs => ubuntu
  • redhat AMIs => ec2-user
  • Amazon AMIs => ec2-user
  • Windows AMIs => administrator
    

Activity 6: create a redhat 9 based ec2 istance with public ip

• my choices:
  • region: mumbai
  • size: t2.micro
  • keypair: mumbai
  • vpc: default
  • subnet: any
  • security group (use the one created above)
• For guided creation watch classroom video
  

Activity 7: Create a Ubunu 24.04 in azure

• Refer Here for steps
• my choices:
• region: eastus
• size: B1s
• keypair: my_idrsa
• virtual network: created by default with virtual machine
• subnet: create by default with virtual machine
• network security group (select options to create by default with virtual machine)
  
  
• Exercise:
  • Create a amazon linux instance and ssh into it
  • create a redhat vm in azure and ssh into it

SSH Command

• SSH two well known ways
  • with username and password ssh username@<ipaddress>
  • with username and key ssh -i <path to private key> username@ipaddress
  • with username and default key ~/.ssh/id_rsa ssh username@ipaddress