I would personally be leaning toward suppressing dhclient induced logging
messages or at most logging them to ramdisk.  Given the fact that the
server also logs and the dhcp server is almost always a server within
convenient reach, I don't think the syslog having dhclient messages from
genesis is a big enough value given the cost.



From:   "Daniel M. Weeks" <[email protected]>
To:     xCAT Users Mailing list <[email protected]>
Date:   03/15/2013 01:24 PM
Subject:        [xcat-user] genesis: limit DHCP startup to connected interfaces



This is a follow-up to my last patch for syslog, motivated mainly by the
amount of log cruft present after resolving that issue.

dhclient is started on all interfaces during /bin/doxcat whether those
interfaces are connected or not. Since ethtool is present in the genesis
image for x86 the attached patch uses it to check for a link and only
starts dhclient on connected interfaces.

If there is a good way to configure/determine if IPv6 is NOT used in the
environment it would also be good to skip starting the v6 copies of
dhclient when it is unnecessary. Before I go and add something
unnecessary, is there currently a clean way to make this determination
(perhaps guided by the site table)? Thanks.

--
Daniel M. Weeks
Systems Administrator
Computational Center for Nanotechnology Innovations
Rensselaer Polytechnic Institute
Troy, NY 12180
518-276-4458
[attachment "doxcat-only_connected.patch" deleted by Jarrod B
Johnson/Raleigh/IBM]
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