[Users] how to refresh REGISTER state when restarting redundant proxy

[Andreas Granig]

Juha Heinanen wrote:
> Christian Schlatter writes:
> 
>  > What issues are you referring to? We are using openser together with a 
>  > mysql 5.0 cluster for quite some time and never had any issues.
> 
> how do you upgrade your openser tables when new fields are
> added/removed, which happens on every new release?

We use a combination of mysql cluster 5.0.x for the location table and 
master/slave replication for everything else for over a year now.

Altering the cluster table is basically done by:
- disabling all except one node at the SIP load balancer and stop mysql 
on the disabled nodes
- putting the remaining active node into single-user-mode
- altering the table on this node
- exiting single-user-mode
- putting back the deactivated nodes into the system

You have to schedule that to a time of day where one proxy/registrar can 
handle all the traffic, but beside that it works quite smoothly...

Cheers,
Andreas

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