Generally, xCAT is using a fixed IP for each node. Running of makedhcp for a node will add the following section in the dhcpd.leases file so that the IP will not be assigned to other node. From this point of view, the lease time is not important any more. But several months ago, we got information from the developer of dhcp that the IP added in the fixed-address section may not be ensured to keep fixed. We recommend another guarantee for keeping the fixed IP is to have the IP range larger than the number of nodes.
host hs21s02 {
dynamic;
hardware ethernet 00:14:5e:d5:25:78;
fixed-address 192.168.5.233;
supersede server.ddns-hostname = "hs21s02";
supersede host-name = "hs21s02";
if option vendor-class-identifier = "ScaleMP" {
supersede server.filename = "vsmp/pxelinux.0";
} else {
supersede server.filename = "pxelinux.0";
}
supersede server.next-server = c0:a8:05:52;
}
Thanks
Best Regards
----------------------------------------------------------------------
Wang Xiaopeng (王晓朋)
IBM China System Technology Laboratory
Tel: 86-10-82453455
Email: [email protected]
Address: 28,ZhongGuanCun Software Park,No.8 Dong Bei Wang West Road,
Haidian District Beijing P.R.China 100193
From: lindsay <[email protected]>
To: <[email protected]>
Date: 2011-07-27 06:18
Subject: [xcat-user] Why is the dhcp lease-time set to 12 hrs?
When makedns creates dhcpd.conf, the lease-time is set to
12 hours. Is there a reason for such a short lease-time?
Thanks,
Jim Lindsay
Northwestern University
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