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add a tip for dhcp lease file growth in large cluster

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immarvin 2016-03-24 09:27:15 -04:00
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docs/source/advanced/hierarchy/configure_dhcp.rst
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@ -6,5 +6,25 @@ Add the relevant networks into the DHCP configuration, refer to: :ref:`Setup-dhc
Add the defined nodes into the DHCP configuration, refer to:
`XCAT_pLinux_Clusters/#configure-dhcp <http://localhost/fake_todo>`_
In the large cluster, the size of dhcp lease file "/var/lib/dhcpd/dhcpd.leases" on the DHCP server will grow over time, when it increases to around 100MB, the DHCP server will take a long time to respond the DHCP requests from the clients, which will cause the DHCP timeout in the client's side: ::
...
Mar 2 01:59:10 c656ems2 dhcpd: DHCPDISCOVER from 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPOFFER on 9.114.39.101 to 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPREQUEST for 9.114.39.101 (9.114.39.157) from 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPACK on 9.114.39.101 to 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPDECLINE of 9.114.39.101 from 00:0a:f7:73:7d:d0 via eth0: not found
Mar 2 01:59:10 c656ems2 dhcpd: DHCPDISCOVER from 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPOFFER on 9.114.39.101 to 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPREQUEST for 9.114.39.101 (9.114.39.157) from 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPACK on 9.114.39.101 to 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPDECLINE of 9.114.39.101 from 00:0a:f7:73:7d:d0 via eth0: not found
Mar 2 01:59:10 c656ems2 dhcpd: DHCPDISCOVER from 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPOFFER on 9.114.39.101 to 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPREQUEST for 9.114.39.101 (9.114.39.157) from 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPACK on 9.114.39.101 to 00:0a:f7:73:7d:d0 via eth0
Mar 2 01:59:10 c656ems2 dhcpd: DHCPDECLINE of 9.114.39.101 from 00:0a:f7:73:7d:d0 via eth0: not found
...
The solution is simply to restart the dhcpd service or run ``makedhcp -n``.