Radius Server Load balancing

                As of version 1.1.0, FreeRADIUS supports load balancing in module sections. Please read about configurable Fail-over for a more complete description of module sections.

                The short summary is that you can use a "load-balance" section in any place where a module name may be used. The semantics of the "load-balance" section are that one of the modules in the section will be chosen at random, evenly spread over the modules in the list.

An example is below:

accounting {

load-balance {

sql1

sql2

sql3

}

}

In this case, 1/3 of the RADIUS requests will be processed by "sql1", one third by "sql2", and 1/3 by "sql3".

The "load-balance" section can be nested in a "redundant" section, or vice-versa:

accounting {

load-balance { # between two redundant sections below

redundant {

sql1

sql2

}

redundant {

sql2

sql1

}

}

}

This says "load balance between sql1 and sql2, but if sql1 is down, use sql2, and if sql2 is down, use sql1". That way, you can guarantee both that load balancing occurs, and that the requests are *always* logged to one of the databases.

accounting {

redundant {

load-balance {

sql1

sql2

}

detail

}

}

This says "load balance between sql1 and sql2, but if the one being used is down, then log to detail".

And finally,

accounting {

redundant { # between load-balance & detail

load-balance { # between two redundant sections

redundant {

sql1

sql2

}

redundant {

sql2

sql1

}

}

detail

}

}

This says "try to load balance between sql1 and sql2; if sql1 is down, use sql2; if sql2 is down use sql1; if both sql1 and sql2 are down, then log to the detail file"