03-22-2010
No the server is on a static IP address. It's very strange i have moved all our most important sites from the broken server (server A) to the back up server (server B). Before I did that Server A was crashing periodically every several hours. Since i have moved a lot of the sites across to server B on friday Server A hasn't crashed since. And Server B is running fine also. This has confused me even further. Could it be
1: There was to much load on server A and now i have balanced the load across the two servers.
2: There is some sort of memory leak in the php codes in some of the sites i moved. But if so wouldn't the backup server start crashing.
3: Server A just hasn't crashed yet because it is apache that is crashing and it hasn't had a chance to crash yet because there is less load. So it will take longer to crash now.
I think i will just have to leave the two servers as they are and see what happens next. It's confusing because there's no real explanation as to whats going on in the logs
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LEARN ABOUT CENTOS
radrelay
RADRELAY(8) FreeRADIUS Daemon RADRELAY(8)
NAME
radrelay -- Deprecated command.
DESCRIPTION
The functions of radrelay have been added to radiusd. One benefit is that one instance of radiusd can read multiple detail files, among
others.
The rlm_sql_log module does something similar, but for SQL queries. See it's man page for details.
REPLICATION FOR BACKUPS
Many sites run multiple radius servers; at least one primary and one backup server. When the primary goes down, most NASes detect that and
switch to the backup server.
That will cause your accounting packets to go the the backup server - and some NASes don't even switch back to the primary server when it
comes back up.
The result is that accounting records are missed, and/or the administrator must jump through hoops in order to combine the different detail
files from multiple servers. It also means that the session database ("radutmp", used for radwho and simultaneous use detection) gets out
of sync.
We solve this issue by "relaying" packets from one server to another, so they both have the same set of accounting data.
See raddb/sites-available/buffered-sql for more information.
BUFFERING FOR HIGH-LOAD SERVERS
If the RADIUS server suddenly receives a many accounting packets, there may be insufficient CPU power to process them all in a timely man-
ner. This problem is especially noticable when the accounting packets are going to a back-end database.
Similarly, you may have one database that tracks "live" sessions, and another that tracks historical accounting data. In that case,
accessing the first database is fast, as it is small. Accessing the second database many be slower, as it may contain multiple gigabytes
of data. In addition, writing to the first database in a timely manner is important, while data may be written to the second database with
a few minutes delay, without any harm being done.
See raddb/sites-available/copy-to-home-server for more information.
SEE ALSO
radiusd(8), rlm_sql_log(5)
AUTHOR
The FreeRADIUS Server Project
23 October 2007 RADRELAY(8)