DevOps Classroom notes 26/Jul/2025

Understanding SSH

• We create a key pair which includes private & public key
• public key is copied into linux
• using ssh command ssh -i <path to private key> username@ipadress we establish the connection password less
  
• The default location of keys on any os
  • private ~/.ssh/id_<algo>
  • public ~/.ssh/id_<algo>.pub
• To create a key pair the command is ssh-keygen

Key Pairs in AWS

• While creating ec2 instances we can get the keys generated by AWS, AWS gives us the private key and keeps the public key.
• While create ec2 AWS will copy the public key into linux machines for ssh connectivity
• AWS also allows you to use your keys i.e. you import public key into AWS key pair
• AWS Keys belong to a region
• AWS EC2 instances by default will not have passwords enabled

Key Pairs in Azure

• Azure has a service called as SSH Keys
• While creating VMs in Azyre we can get the keys generated by SSH Keys, Azure gives us the private key and keeps the public key.
• While create VM Azure will copy the public key into linux machines for ssh connectivity
• Azure also allows you to use your keys i.e. you import public key into SSH Keys service
• Azure allows both password & Key based.

Lets import ssh key into AWS

• For AWS watch classroom video
• In Azure Refer Here for importing and generating keys