Creating new User in Amazon EC2

Step 1: Login to EC2 instance using SSH and public key

Step 2:add a new user
   sudo adduser newuser[newuser name]

Step 3: Switch to the new user
   sudo su - newuser[newuser name] -- connect to new user a/c

Step 4: Create a .ssh directory for the authorized_keys file.
   mkdir .ssh

Step 5: change the permission of .ssh
   chmod 700 .ssh

Step 6: Create a file named "authorized_keys" in the .ssh directory.
   touch .ssh/authorized_keys
   //or we can user vi editor

Step 7: Change the file permissions of the authorized_keys file to 600 (this means only the file owner can read or write to the file).
   chmod 600 .ssh/authorized_keys  //this step is very important

Step 8: use ssh-keygen to get the public key for your key pair
   ssh-keygen -f username  // This command will create 2 files one with .pub extension.

Step 9: Copy the content generated of key.pub to .ssh/authorized_keys and chanage permission of authorized_keys to 600
//careful while copying the contents.

Step 10: Copy the content of another public file to file.pem in your local machine.
    //that creates your public ssh key. i.e .pem file.

Step 11: Now you have added a new user to the aws ec2-machine through command and try to connect to the ec2 machine with the new user name and new .pem key.


Note: Do not perform these actions as a root user.


Providing root user / admin user access to newly added user

sudo adduser <username> sudo #for sudo user
sudo adduser <username> admin #for admin user