DHCP Failover and Performance

Simon Hobson dhcp1 at thehobsons.co.uk
Wed Feb 22 21:25:02 UTC 2012


perl-list wrote:
>Perhaps not ... perhaps if you kept dhcpd.leases~ on the HARD disk 
>.. dhcpd.leases on the RAM disk...  some clever symlinking could 
>accomplish that.

No it wouldn't - it would be undone within an hour of setting it up.

The server writes out a new leases file once per hour (compiled in 
default). It does this by writing a new version of the file, (if 
successful) it then moves the current leases file to a different 
name, and moves the new file to be the current leases file.
Any symlinks would be removed, at most within 2 hours. EG, if you 
moved the leases file and symlinked it - then at the first refresh, 
the symlink would be moved to be the backup and the live file would 
not be symlinked elsewhere; and on the second refresh, the symlink 
would be removed altogether.

-- 
Simon Hobson

Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.


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