Step 0. Login by default user, “ubuntu”:
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| ssh -i my_key.pem ubuntu@111.111.11.111
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Step 1. Create a new user, we will call our new user “john”:
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| [ubuntu@ip-11-111-111-111 ~]$ sudo adduser gmsundar
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Set password for “gmsundar” by:
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| [ubuntu@ip-11-111-111-111 ~]$ sudo su
[root@ip-11-111-111-111 ec2-user]$ passwd gmsundar
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Add “gmsundar” to sudoer’s list by:
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| [root@ip-11-111-111-111 ec2-user]$ visudo
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and add this to the last line:
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| gmsundar ALL = (ALL) ALL
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Alright! We have our new user created, now you need to generate the key file which will be needed to login, like we have my_key.pem in Step 0.
Now, exit and go back to ubuntu, out of root.
Step 2. Creating the public and private keys:
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| [ubuntu@ip-11-111-111-111 ~]$ su gmsundar
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Enter the password you created for “gmsundar” in Step 1.
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| [gmsundar@ip-11-111-111-111 ec2-user]$ cd /home/gmsundar/
[gmsundar@ip-11-111-111-111 ~]$ ssh-keygen -b 1024 -f gmsundar -t dsa
[gmsundar@ip-11-111-111-111 ~]$ mkdir .ssh
[gmsundar@ip-11-111-111-111 ~]$ chmod 700 .ssh
[gmsundar@ip-11-111-111-111 ~]$ cat gmsundar.pub > .ssh/authorized_keys
[gmsundar@ip-11-111-111-111 ~]$ chmod 600 .ssh/authorized_keys
[gmsundar@ip-11-111-111-111 ~]$ sudo chown gmsundar:ubuntu .ssh
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In the above step, gmsundar is the user we created and ubuntu is the default user group.
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| [gmsundar@ip-11-111-111-111 ~]$ sudo chown gmsundar:ec2-user .ssh/authorized_keys
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Step 3. Now you just need to download the key called “gmsundar”
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| [gmsundar@ip-11-111-111-111 ~]$ sudo cp gmsundar /home/ubuntu/
[gmsundar@ip-11-111-111-111 ~]$ sudo chmod 777 /home/ubuntu/gmsundar
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Now come to local machine’s terminal, where you have my_key.pem file and do this:
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| scp -i my_key.pem ubuntu@111.111.11.111:/home/ubuntu/gmsundar gmsundar
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The above command will copy the key “gmsundar” to the present working directory on your local machine. Once you have copied the key to your local machine, you should delete “/home/ubuntu/gmsundar”, since it’s a private key.
Now, one your local machine chmod gmsundar to 600.
Step 4. Time to test your key:
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| ssh -i gmsundar gmsundar@111.111.11.111
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So, in this manner, you can setup multiple users to use one EC2 instance!!
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