Wait for the following message, that must appear on the clients console:
Started sshd. You must now go to your imageserver and issue the following command: si_pushinstall --hosts ${HOST_OR_IP}.If you are not able to physically watch the clients console you can use monitoring features and check this message from the SystemImager virtual console (see http://wiki.systemimager.org/index.php/Monitoring for more details). The message above means that the clients are ready to accept SSH connection from the image server, so just run the command suggested on the console. You can use also host ranges with si_pushinstall to open all the SSH tunnels in a single shot. For example if you have to image from node01 up to node20 run:
# si_pushinstall --hosts node01-node20Then boot the clients with the autoinstall CD / USB drive or via PXE and enjoy the secure auto-installation.