Avatar of carlino70
carlino70
Flag for Argentina asked on

Remove ssh key pair generated - Linux

Hi experts, I made a setup ssh key-pairs between two servers.
It worked well, but now I want to delete it.
The problem is that as it is now prompted for authentication locally to the application when trying to run a script for it. For example to run a stop_app, asks me to enter the user password ( should not ).
Here are the steps I did:
server_1:/home/user/> ssh-keygen -t rsa

Open in new window

I not joined the "passphrase" twice, then 2 files were generated:
id_dsa
id_dsa.pub

Open in new window

I copied id_dsa_pub to the server_2:
server_1:/home/user/scp id_rsa.pub user@server_2:/home/user/.ssh/

Open in new window

Prior backup, renamed it id_rsa.pub:
server_2:/home/user/cp -p authorized_keys authorized_keys_bkp
server_2:/home/user/mv id_rsa.pub authorized_keys

Open in new window

I grant permission to the new file:
server_2:/home/user/chmod 644 authorized_keys

Open in new window

To try to remove the entries, I tried on both servers:
ssh-keygen -R hostname

Open in new window

without positive results.
Then, when I returned to the previous file, "autorized_keys", I try:
server_1:/home/user/>ssh user@server_2:/home/user

Open in new window

I see the message:
ssh server_2:/home/user: Temporary failure in name resolution

Open in new window

I did not make a backup of known_hosts.
What are the correct steps to roll back the configuration?
Tkankyou in advanced, regards.
Linux

Avatar of undefined
Last Comment
carlino70

8/22/2022 - Mon
gheist

It is a problem with DNS server or DNS records, nothing to do with authorized keys files.
carlino70

ASKER
I had to regenerate the keys, using a resident script in my /home, which updates the authorized_keys and known_hosts files. It is based on the list of users and network nodes.
This for all users.
With this I could solve the problem.
ASKER CERTIFIED SOLUTION
gheist

Log in or sign up to see answer
Become an EE member today7-DAY FREE TRIAL
Members can start a 7-Day Free trial then enjoy unlimited access to the platform
Sign up - Free for 7 days
or
Learn why we charge membership fees
We get it - no one likes a content blocker. Take one extra minute and find out why we block content.
Not exactly the question you had in mind?
Sign up for an EE membership and get your own personalized solution. With an EE membership, you can ask unlimited troubleshooting, research, or opinion questions.
ask a question
carlino70

ASKER
Thanks!
Experts Exchange has (a) saved my job multiple times, (b) saved me hours, days, and even weeks of work, and often (c) makes me look like a superhero! This place is MAGIC!
Walt Forbes