[RADIATOR] Radiator high Availability

sergio sergio at inbox.com
Mon Aug 27 20:10:48 CDT 2012


Thank you for answers.

What is the safest way to have 2 servers for high availability with Radiator.

Thanks

> -----Original Message-----
> From: hvn at open.com.au
> Sent: Mon, 27 Aug 2012 15:17:59 +0300
> To: radiator at open.com.au
> Subject: Re: [RADIATOR] Radiator high Availability
> 
> On 08/26/2012 03:00 PM, sergio wrote:
>> I use Radiator 4.10 and I need to place a second radiator and I use
>> FreeBSD, but I need a solution to the sessions (SessionDatabase SQL) is
>> well synchronized since I use mysql. A mysql replication via resolves or
>> is there a better solution?
> 
> Here are some thoughts:
> 
> You should consider cases where the replication master becomes
> unreachable. If radiusd switches to secondary DB server, what happens
> when the primary comes back?  I am assuming there are two DB servers,
> master that replicates to secondary server.
> 
> If there's a network connectivity problem with one radiusd and the DB
> master server and radiusd decides to switch to the secondary DB. What
> happens when there are writes to both DB server.
> 
> If the writes can happen to both DB servers, how fast should the
> replication be? Assuming you have two radius servers and there's a very
> short lived session where the accounting start and stop messages go to
> different RADIUS servers which talk to different DB servers, is the DB
> synchronised when the session ends? Could session stop be recorded after
> session start?
> 
> If you try to make replication quicker, how soon will the database start
> having load problems.
> 
> Note: I'm not very familiar with MySQL synchronisation. There are likely
> many other things to consider too.
> 
>> I also thought about using FreeBSD with CARP.
> 
> CARP seems to allow hosts to share the same IP address. RADIUS requires
> certain amount of state to handle e.g., retries and knowing which reply
> is related to which request. Sharing an address can lead to problems
> when related RADIUS messages are sent to multiple different RADIUS
> servers.
> 
> Thanks,
> Heikki
> 
> --
> Heikki Vatiainen <hvn at open.com.au>
> 
> Radiator: the most portable, flexible and configurable RADIUS server
> anywhere. SQL, proxy, DBM, files, LDAP, NIS+, password, NT, Emerald,
> Platypus, Freeside, TACACS+, PAM, external, Active Directory, EAP, TLS,
> TTLS, PEAP, TNC, WiMAX, RSA, Vasco, Yubikey, MOTP, HOTP, TOTP,
> DIAMETER etc. Full source on Unix, Windows, MacOSX, Solaris, VMS,
> NetWare etc.
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