How to create pem file and access linux Server via pem file

How to create pem file and access linux Server via pem file

In this tutorial we setup pem file to login server(Ubuntu) with pem file without password on linux server. We are create pem file which used to access linux server. Pem file is a private file which do generate via ssh-keygen on linux server.

Impotent :- You need to backup old key files if you have old keys server.

1st create the keys and RSA will create public and private keys. if you no need add passphrase on your key then you can add passphrase with key but I skipped the passphrase on server.

[root@solutionclub ~]#  ssh-keygen -t rsa -b 2048

Enter file in which to save the key (/home/solutionclub/.ssh/id_rsa):  Enter
Created directory '/home/solutionclub/.ssh'.
Enter passphrase (empty for no passphrase): Enter
Enter same passphrase again: Enter
Your identification has been saved in /home/solutionclub/.ssh/id_rsa.
Your public key has been saved in /home/solutionclub/.ssh/id_rsa.pub.
The key fingerprint is: 58:33:80:a5:df:14:b1:af:4f:90:07:35:3x:01:50:02

Now we are creating private to pem key

[root@solutionclub ~]# openssl rsa -in /home/solutionclub/.ssh/id_rsa -outform pem > /home/solutionclub/solutionclub.pem

We need to generate the public key PEM file for users distribution :

[root@solutionclub ~]# openssl rsa -in solutionclub.pem -pubout -out pub_dsa.pem

After generating pem from id_rsa (Private Key) then we need to set file permission on pem file.

[root@solutionclub ~]# chmod 600 /home/solutionclub/solutionclub.pem

Now you need to copy pem key to your server which your are need to password less authenticate.

[root@solutionclub ~]# mkdir ~/.ssh
[root@solutionclub ~]# cat solutionclub.pem >> .ssh/authorized_keys
[root@solutionclub ~]# chmod 600 .ssh/authorized_keys

After these steps you need to add change some parameters in sshd_config file.

[root@solutionclub ~]#  vim /etc/ssh/sshd_config

RSAAuthentication             yes
PubkeyAuthentication      yes
AuthorizedKeysFile	%h/.ssh/authorized_keys
PasswordAuthentication    no
# Change to no to disable s/key passwords
ChallengeResponseAuthentication    no
UsePAM        yes

After save file then you can check your connection on terminal

 [root@solutionclub ~]#  ssh -i  /home/solutionclub/solutionclub.pem test@

That should do it! I hope you find this tutorial helpful. Feel free to ask any questions!