[Freeswitch-users] Live Upgrade Techniques

[Steve Kurzeja]

On Sat, Jun 13, 2009 at 4:54 AM, Michael Giagnocavo <mgg at giagnocavo.net>wrote:

>  Well, Nextone for instance has a database the keeps most of the state of
> calls, and it’s replicated between the two nodes. (I seem to recall the
> database was GNU dbm, but I might be mistaken.) However, as of 4.3 anyways,
> the CDRs still get truncated when there’s any kind of switchover.
>
>
>

BTW in Nextone v4.0.x the GNU db is used for storing configuration data like
storing routes & other bits which is then loaded into memory. Nextone 4.3
and above uses postgres for this configuration data. The actual call state
information is stored in memory and replicated to the standby box via some
custom network protocol.

Stateful call migration would be a very useful feature in FS but I imagine
its way down the roadmap.

But as to the original question of live upgrades,  having some form of load
balancing proxy and then bleeding off traffic from the box you want to
upgrade is the most feasible approach, as others have mentioned.

Steve
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