05-18-2011
use public key and put it into the ~user/.ssh/authorized_keys
setup the ssh-agent so that you can automagically authentify (you will be prompted for your keyphrase once at the startup of the ssh agent, but then you will be able to remote login to all the machin for which you have added your public keys into their $HOME/.ssh/authorized_keys file.
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LEARN ABOUT REDHAT
ssh-add
SSH-ADD(1) BSD General Commands Manual SSH-ADD(1)
NAME
ssh-add -- adds RSA or DSA identities to the authentication agent
SYNOPSIS
ssh-add [-lLdDxX] [-t life] [file ...]
ssh-add -s reader
ssh-add -e reader
DESCRIPTION
ssh-add adds RSA or DSA identities to the authentication agent, ssh-agent(1). When run without arguments, it adds the files
$HOME/.ssh/id_rsa, $HOME/.ssh/id_dsa and $HOME/.ssh/identity. Alternative file names can be given on the command line. If any file requires
a passphrase, ssh-add asks for the passphrase from the user. The passphrase is read from the user's tty. ssh-add retries the last
passphrase if multiple identity files are given.
The authentication agent must be running and must be an ancestor of the current process for ssh-add to work.
The options are as follows:
-l Lists fingerprints of all identities currently represented by the agent.
-L Lists public key parameters of all identities currently represented by the agent.
-d Instead of adding the identity, removes the identity from the agent.
-D Deletes all identities from the agent.
-x Lock the agent with a password.
-X Unlock the agent.
-t life
Set a maximum lifetime when adding identities to an agent. The lifetime may be specified in seconds or in a time format specified in
sshd(8).
-s reader
Add key in smartcard reader.
-e reader
Remove key in smartcard reader.
FILES
$HOME/.ssh/identity
Contains the protocol version 1 RSA authentication identity of the user.
$HOME/.ssh/id_dsa
Contains the protocol version 2 DSA authentication identity of the user.
$HOME/.ssh/id_rsa
Contains the protocol version 2 RSA authentication identity of the user.
Identity files should not be readable by anyone but the user. Note that ssh-add ignores identity files if they are accessible by others.
ENVIRONMENT
DISPLAY and SSH_ASKPASS
If ssh-add needs a passphrase, it will read the passphrase from the current terminal if it was run from a terminal. If ssh-add does
not have a terminal associated with it but DISPLAY and SSH_ASKPASS are set, it will execute the program specified by SSH_ASKPASS and
open an X11 window to read the passphrase. This is particularly useful when calling ssh-add from a .Xsession or related script.
(Note that on some machines it may be necessary to redirect the input from /dev/null to make this work.)
SSH_AUTH_SOCK
Identifies the path of a unix-domain socket used to communicate with the agent.
DIAGNOSTICS
Exit status is 0 on success, 1 if the specified command fails, and 2 if ssh-add is unable to contact the authentication agent.
AUTHORS
OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen. Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos,
Theo de Raadt and Dug Song removed many bugs, re-added newer features and created OpenSSH. Markus Friedl contributed the support for SSH
protocol versions 1.5 and 2.0.
SEE ALSO
ssh(1), ssh-agent(1), ssh-keygen(1), sshd(8)
BSD
September 25, 1999 BSD