[Asterisk-biz] Clustering Solutions for Asterisk

[Jon Carnes]

Paul,

If you don't load the drivers for the T-1 hardware then you should be
able to simply run a pass-through cable connecting to your second
server's T-1 hardware.  This will work on fail-over only if the primary
powers down - which you can do using a UPS that is intelligent.

I use a set of scripts that mirror the primary to a secondary and keep
the secondary up-to-date (within 24 hours of changes to the primary).

http://www.trilug.org/~jonc/Failover_scripts/

I've been using the same set of scripts for about 5 years. They work
fine for all my Master/Slave setups.

I'm new to the list, but we've been using Asterisk for corporate use for
over three years now.

Jon Carnes
FeatureTel

On Sun, 2005-10-02 at 13:36, Paul wrote:
> I am working on a similar problem and have some ideas for you.  First I'm
> using two servers with a T1 card in each.  I have two companies currently in
> the same location so the IP range can be in the same subnet without worrying
> about SER or the like.
> 
> In order for two companies to be on their own server yet be redundant to
> each other I have devised a calling plan where both extensions are dialed to
> reach the user (and both extensions have voicemail).  As an example,
> operator for company one is extension 200 as well as 200 on the backup
> (second company) server and the extensions file dials both (using IAX to
> link servers). So regardless of phone registration, the call can be
> answered.
> 
> Each server has the same configuration (a complete mirror copy) allowing the
> dial out to use the PRI line that is active (there is only one - again IAX
> link)
> 
> Since I have not found any T1 cards that offer failover yet, the customer
> must move the T1 cable.  I was thinking about using the led power on the T1
> card (when polarity reverses to red) and wire it to an optoisolator, time
> delay and old fashion relay to move the T1 to the second server if I cant
> find an external T1 failover switch for a good price.
> 
> I did speak to Sangoma Technologies about adding this feature to their card
> but they have not done so yet.  
> 
> I have been playing with this for a month now and some of the problems I'm
> facing are the refusal of SIP 7.5 on Cisco's 7960s to use the emergency
> proxy when the primary is not responding.
> 
> Some other minor problems are how to move the voice mail back to the correct
> servers as well as the call reporting.  I'm approaching this from two
> avenues -
> 1 - Internal cron jobs looking at each others servers to pull the data back 
> 2 - A separate Win XP station using a custom VS net program into the mysql
> databases of each server as well as possibly being the trigger for the T1
> failover.
> 
> I have not finished this yet, but if anyone has any ideas or has tried what
> I am trying please let me know also.  Also - interesting thought about the
> linking of servers, does the IAX link cause a transcode on inbound and
> outbound (extension to extension as well as extension to T1 BETWEEEN BOXES)?
> Should I link them through SIP which is used by all phones?
> 
> I'm just trying to use the mirror approach which is great for SMB's - my
> market.
> 
> Paul Norris
> (631) 878-6438
> Silicon Valley Products
> E. Moriches, NY
> 
> 
> 
> 
> 
> 
> 
> >Has anyone real experiences with clustering for Asterisk ?
> 
> >I already did some googling, and also look at wi-ki for solutions for High
> >Avaiability, but I did not find enough info to aply a solution for my
> >customer.
> 
> >He wants a cluster, and if possible, to have their staff load balanced to
> >two asterisk. When one of them crash or does not works correctly, the other
> >one should make his job on a transparent work to the users...
> 
> >So, I prefer an active-active cluster, but if that is impossible to cover,
> >it is Ok to have an active-passive cluster.
> 
> >It would be nice if also it could cover the following
> 
> >- Customer has only on PRI (E1) line... Is there any way for both asterisk
> >to use the same circuit ?
> 
> >Also, for small installations (to 8 extensions) I would need a solution for
> >the main operator phone to remain active if Asterisk goes down. I mind, if
> >PBX does not work, the external line should at least get connected dirctly
> >to the phone and allow them to receive calls until situation is solved. Any
> >idea on this ?
> 
> 
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