On 29/06/11 11:46, ShibuThomas wrote:
> HI all.
>
> I want to do ssh login into two different mechines on by one.I tried the
> following squence.but it is not working correctly.
> For Ex I have 3 mechines Host1,Host2,Host3.
> I need to login into Host2,Host3 using SSH from Host1.
> I tried the following:
> step 1:
> -logged into Host 1
> -execute ssh localhost
Why, you are already logged into host1?

> -execute ssh-keygen -t dsa
> -execute scp ~/.ssh/id_dsa.pub Host2:.ssh/authorized_keys2
> -exectue ssh -l root Host2
> not get the prompt for password.

Ok, so now you have a private key on host1, and the corresponding public
key on host2.

> Then I tried to connect to Host3
> step 2:
> -logged into Host 1
> -execute ssh localhost
> -execute ssh-keygen -t dsa

You just created a new public/private key pair, overwriting the keys you
previously created (which you need to logon to host2).

> -execute scp ~/.ssh/id_dsa.pub Host3:.ssh/authorized_keys2
> -execute ssh -l root Host3
> not get the prompt for password.

Ok, so using the new public/private key works for host3.

> But after this I tried to connect Host2 from Host1 using
> -ssh -l root Host2
> I got the prompt for enetring pasword.

Because you overwrote the private key on host1 which is needed to
connect to host2 using the public key on host2.

> Is anyone know how to rectify this.
>

Copy the new public key to host2

> -log into Host 1
> -execute scp ~/.ssh/id_dsa.pub Host2:.ssh/authorized_keys2

All you needed to do at step 2 was copy the same public key to host3,
just as you had already done for host2.

--
Nigel Wade, System Administrator, Space Plasma Physics Group,
            University of Leicester, Leicester, LE1 7RH, UK
E-mail :    nmw@ion....
Phone :     +44 (0)116 2523548, Fax : +44 (0)116 2523555

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