multiple pub keys

i usually have a myriad of keys for different automated processes. i really like backing up stuff using unattended rsync scripts; and since you can wrap rsync in ssh, having multiple keys is a good idea - plus the security aspect is cool, too.

my nomenclature for keys is the following:
id_typeofencryption_clientboxname.application

here's how to create an additional key and place it on the target (client) box:

# ssh-keygen -t rsa -b 2048 -f id_rsa_client.rsync
# ssh user@client <- it is a good idea to see if you can connect to the client before the next step
# cat id_rsa_client.rsync.pub | ssh user@client 'sh -c "cat >> .ssh/authorized_keys2"'
# ssh -l user -i id_rsa_client.rsync client

got it?

this is particularly useful if you want to run a specific command when a client connects; say, update files, move things around. neato.