Editing SSH Host Key Management (section)

== Usage ==
With the '''host_update''' script in place in a central host (aslan currently) and the '''host_check''' script installed in each host, any change to the master '''hosts''' file will get propagated within two hours (depending on the synchronization between the hourly cron jobs on each host).  For the two use cases, these procedures must be followed for this propagation to occur:

; New Host
: Simply add a new line to the master '''hosts''' file and either wait for the updates to occur or manually regenerate the '''known_hosts''' file by issuing the command:
: <pre>sudo ./host_update.sh -f</pre>
; Reinstall host with new host keys
: Since the automated update is triggered on the modified date of the master '''hosts''' file, you can '''touch''' the file to update the modification date and the update will be triggered.  You can also force the update as above.  

There is no way to manually trigger the propagation to all the other hosts; but if one particular host is needed, log into the host from ''another'' system and issue the command:
 sudo /etc/cron.hourly/host_check

That will force the update for the host that is needed immediately; the other will catch up when the cron job runs.