[Freeswitch-users] Live Upgrade Techniques

[John Dalgliesh]

Hi,

On Thu, 11 Jun 2009 at 16:33 -0400, Michael Giagnocavo wrote:
>
> Well, if you're running multiple machines, waiting for it to drainstop 
> isn't that big of a deal unless you're in some sort of hurry, right? 
> Give it an hour or so to drainstop, then kill 'em.

Yes that's exactly what I'm trying to do. The problem is some people will 
only try one IP address.

> Would it not be simpler to try to do something with re-invites or REFER, 
> assuming your endpoints support it?

That was actually plan A. I already added a property in sip_profile called 
failover_redirect, which specifies another server to try if FS can't 
allocate any more sessions (e.g. too busy, paused, shutdown asap, etc.), 
by sending back a SIP 302 Moved Temporarily response, instead of 503 Max 
Calls In Progress.

Turns out not all my endpoints support it :(

I considered REFER too but there seems to be even less support for that.

If I can't get the socket-sharing upgrade working then I will fall back to 
this - and peers which don't support the 302 response (or more likely, 
don't authorise it) will just get no service during the upgrade.

> -Michael

{P^/

> -----Original Message-----
> From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of John Dalgliesh
> Sent: Thursday, June 11, 2009 12:14 PM
> To: freeswitch-users at lists.freeswitch.org
> Subject: Re: [Freeswitch-users] Live Upgrade Techniques
>
>
> I assume he's talking about hardware failures here :P
>
> But to answer the question: crashes are easy to deal with. With a crash
> you have lost the calls that are in progress anyway; you don't have to
> manage a gradual transition.
>
> Currently, since FS is quite quick to start up, I am just relaunching it
> immediately.
>
> But when I have a second box up and running what I'll do is just add the
> IP of the dead machine as another IP of the second box, and then it will
> take all the old machine's traffic. That is the plan anyway. I've seen
> some commercial boxes that use a similar trick.
>
...