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==Using an SSH agent==

Most recent Unix derivatives include by default an SSH agent (“gnome-keyring-daemon” in most cases) to keep and manage the user SSH keys. If you use one of these derivatives you must include the new keys into the SSH manager keyring to be able to connect to the HPC cluster. If not, SSH client will display an error message (see [[Login to cluster]]) similar to this:
  Agent admitted failure to sign using the key. 
  Permission denied (publickey,gssapi-keyex,gssapi-with-mic).
This could be ﬁxed using the ssh-add command. You can include the new private keys’ identities in your keyring with: 
  $ ssh-add
Tip: Without extra options ssh-add adds any key located at $HOME/.ssh directory, but you can specify the private key location path as argument, as example: ssh-add /path/to/my/ id_rsa. 
  $ ssh-add -l
After these changes the key agent will keep your SSH key to connect to the clusters as usual. Tip: You should execute ssh-add command again if you generate a new SSH key. Visit https://wiki.gnome.org/Projects/GnomeKeyring/Ssh for more information.