Assingment by Shubham Sir (Linux Advanced)

1 > What is public key?

A public key is like a lock you give to others. They use it to send you a message safely, but only you can open it with your private key.

2 >what is private key?

A private key is like a secret key you keep to yourself. It lets you open and read messages sent to you with your public key. Never share your private key; it’s for you only.

3> what is authorized key?

An authorized key is a public key saved on a server to let you log in safely. If your private key matches it, you get access without needing a password.

4 > Create an two ec2 instance and connect with each other and also connect with local ?

Connect to EC2 Instances from Local

Step 1 -

First we create two server :

Create a same key pair for both instance

and make the same name of directory pem.key file in both instance (private key)

Step 2 -

change permissions of your key file:

chmod 400 server.pem

step 3 -

Connect to server_1:

ssh -i "server.pem" ubuntu@<Public_IP_of_server_1>

Step 4 -

Connect to server_2 from server_1:

• First, get the private IP of server_2 from the EC2 console.

• Then, use the following command:

  ssh -i "server.pem" ubuntu@<Private_IP_of_server_2>

Step 5 -

Connect to the Instances from Your Local Machine

1. Get the Public IP addresses of server_1 and server_2 from the EC2 console.

2. SSH into server_1 from your local machine:

   ssh -i "server.pem" ubuntu@<Public_IP_of_server_1>

3. To connect to server_2 directly from your local machine, use:

   ssh -i "server.pem" ubuntu@<Public_IP_of_server_2>