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