High Avaibility

[McNutt, Justin M.]

Be careful with load balancers too.  Some NAS don't work well through a load balancer (Trapeze wireless controllers).

--J

From: Толик Шавловский <tolik_shavlovsky at mail.ru<mailto:tolik_shavlovsky at mail.ru>>
Reply-To: Толик Шавловский <tolik_shavlovsky at mail.ru<mailto:tolik_shavlovsky at mail.ru>>, FreeRadius users mailing list <freeradius-users at lists.freeradius.org<mailto:freeradius-users at lists.freeradius.org>>
Date: Thu, 1 Mar 2012 17:52:29 +0400
To: FreeRadius users mailing list <freeradius-users at lists.freeradius.org<mailto:freeradius-users at lists.freeradius.org>>
Subject: Re[2]: High Avaibility

Hi,

if your NAS does not support 2 radius servers you can use load balancer (ex fortinet).




01 марта 2012, 15:37 от Phil Mayers <p.mayers at imperial.ac.uk<mailto:p.mayers at imperial.ac.uk>>:
On 01/03/12 10:16, Anto wrote:
> Hello
>
> In the coming days I will set up a freeradius server for access
> control and accounting. I've been looking for information on
> freeradius and high availability, since my idea is to have two servers
> in case one fails, continue to operate with the other, but I just
> found information. So I turn to the list, in case I can recommend
> someone with experience on stage.
>
> I do not know if it is feasible to have a server as master and one
> slave, when the main falls, the other up the interface. If there is
> some kind of balancer radius and use both servers, etc..
This is a very vague question. You're going to get a lot of either
too-vague or too-specific answers.
A few things you need to specify:
   1. When you say "high availability" what are you hoping to achieve?
   2. How long can you tolerate when an unscheduled outage for? 1 second
or 60?
   3. Do your RADIUS servers talk to external data sources (SQL, LDAP)?
   4. Do you care about load-balancing, or just high-availability?
I'll make a few comments:
Most NASes support 2 (or more) RADIUS servers, and will fail over when
they detect an outage. For resilience, you just need to build two RADIUS
servers on different IPs, and specify these in your NAS.
You don't need a load-balancer or other complications, and they will
just make things less reliable.
Making "redundant" RADIUS servers is easy; you just build two machines,
and run FreeRADIUS on each with the same config. The "hard" bit is
replicating any data sources between them (LDAP, SQL) and handling
"writes" such as accounting packets into SQL, SQL session counters, and
so on.
You need to be more specific about what you're doing and what you want
to achieve.
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