Comments on: Howto use multiple SSH keys for password less login

By: jay

jay — Sat, 24 Sep 2011 14:29:09 +0000

Hi folks,

Currently,for instance, many servers can do passwordless ssh to SERVER A
Now,we are migrating all the stuff from Server A to Server B.
all those servers which were connecting to Server A,now need to connect to Server B.
Can i copy over the authorized_keys file from A to B ,so all those servers can connect to server B passwordlessly.
The idea is to avoid all those servers keys addition to server B /etc/ssh/auth_keys/ file.

Does it matter if platform(solaris to linux,vice versa)is different?

2nd case:
Server A connects to other servers using ssh which is passwordless. ServerA will be replaced by server B.
do i need to send Servers’ B pub key to all those other servers have them add serverB pub key in their authorized key file?
Or to avoid this, can i just copy over the pub key pair from server A to Server B,so other servers wont have to make any change on their side.

By: Matt

Matt — Tue, 08 Sep 2009 18:37:03 +0000

Check out the ssh-copy-id command. It will take care of appending your public key onto the remote system.

By: Ron

Ron — Fri, 24 Jul 2009 11:12:09 +0000

Thanks. We have added this to our intranet wiki, just for future ;)

By: pixeldoc

pixeldoc — Thu, 02 Apr 2009 23:00:21 +0000

if you have trouble login to your server, check if /etc/ssh/sshd_config contains Protocol 2 PubkeyAuthentication yes.

By: yh

yh — Mon, 16 Mar 2009 08:40:51 +0000

Can i know why need to append own public key to own authorized_keys?
i thought own public key is used for others?
web1 id_rsa.pub append to web2 authorized_keys (correct)
web2 id_rsa.pub append to web1 authorized_keys (correct)
web2 id_rsa.pub append to web2 authorized_keys (doubt)

By: vivek

vivek — Wed, 07 May 2008 13:34:16 +0000

Mikko,

thanks for the heads up!

By: Mikko

Mikko — Wed, 07 May 2008 13:02:15 +0000

e) Should be like

workstation#2 $ scp ~/.ssh/authorized_keys user@remote.server.com:.ssh/

instead of

workstation#2 $ scp ~/.ssh/id_rsa.pub user@remote.server.com:.ssh/authorized_keys
(this ruins the whole idea)

By: matt

matt — Fri, 29 Feb 2008 17:00:43 +0000

I do something like this:

cat .ssh/id_rsa.pub | ssh user@server “cat >> .ssh/authorized_keys”

By: Malyadri

Malyadri — Sun, 27 Jan 2008 17:48:58 +0000

Good tutorial…..

By: ns

ns — Mon, 05 Nov 2007 16:42:00 +0000

@Dillip

It might be that you are using SSLv2 in which case you have to copy/append the key to authorized_keys2

By: Dillip

Dillip — Wed, 17 Oct 2007 11:49:24 +0000

Sir

After creation of key in pc-1 (id_rsa.pub) copy to pc-2 as authorized_keys but I am not able to ssh username@pc-2, against it is now asking password.

Kindly help

Dillip Dhala
dkdhal1@gmail.com