How to remove RSA Key Fingerprint?

Question?

I’d like to remove the following RSA key fingerprint from my DirectAdmin vps because I no longer have an ecommerce website that required it.

This is a message I got from my vps: 

Code:

The authenticity of host ’128.31.301.40 (128.31.301.40)’ can’t be established.
RSA key fingerprint is 4d:05:3e:5b:ea:90:7a:be:6e:55:bc:ba:12:02:06:69.

Answer:

Just remove it from ~/.ssh/known_hosts or empty the file. As soon as you try to connect a host again, the file will be created with correct data.

How to create password less ssh connection for multiple non-root users

I had done password less shh authentication between multiple Linux box a couple of time but this time I had to do the same for normal user. I thought it would be same and actually it is the same but still there are few things which we might miss out and also it becomes a bit complicated and confusing as I did so for them I thought I should give some tips.

Question
You have to create a password less ssh connection between 3 Linux box for non root user i.e a normal user user1.

Pre-requisites
User user1 should exist on all the 3 Linux box

Server details
server1.example
IP 192.168.1.6

server2.example
IP 192.168.1.11

server3.example
IP 192.168.1.12

SSH Passwordless Login Using SSH Keygen in 5 Easy Steps

SSH (Secure SHELL) is an open source and most trusted network protocol that is used to login into remote servers for execution of commands and programs. It is also used to transfer files from one computer to another computer over the network using secure copy (SCP) Protocol.

In this article we will show you how to setup password-less login on RHEL/CentOS 7.x/6.x/5.x and Fedora using ssh keys to connect to remote Linux servers without entering password. Using Password-less login with SSH keys will increase the trust between two Linux servers for easy file synchronization or transfer.

Setup SSH Passwordless Login

My Setup Environment

SSH Client : 192.168.0.12 ( Fedora 21 )
SSH Remote Host : 192.168.0.11 ( CentOS 7 )

If you are dealing with number of Linux remote servers, then SSH Password-less login is one of the best way to automate tasks such as automatic backups with scripts, synchronization files using scp and remote command execution.

In this example we will setup SSH password-less automatic login from server 192.168.0.12 as user tecmint to 192.168.0.11 with user sheena.