Setting Up Passwordless SSH and Alias For Remote Login – Ubuntu 18.04
We will be able to ssh from one remote-1 machine into another remote-2 machine without typing its IP and the password in the terminal.
Prerequisite
A user with sudo privileged access to the remote servers
Implementation
1. Log in to a remote-1 server
| ssh user@ip |
2. As a root user run the below command to add the remote-1 server key to the remote-2 server to log in without a password
| ssh-copy-id user@remote-2 IP === Provide the required password === |
3. Log in to a remote-2 server and edit the sudoers file
| vi /etc/sudoers |
5. Copy and paste the below line under the section #includedir /etc/sudoers.d to avoid entering the password while doing sudo su
Then save and exit from the file
| user ALL=(ALL) NOPASSWD: ALL |
7. In the remote-1 server under as a root user, add the alias in the .bashrc file
| cd /root vi .bashrc ==== Copy and paste the below line. Modify the IP and name accordingly without adding space ==== alias name=’ssh user@remote-2 IP’ |
8. Then execute the .bashrc script with the below command
| source ~/.bashrc |
9. Then try to access the remote-2 server with the alias name from the remote-1 server, we should able to log in without password and IP address
