[ixpmanager] Migration to another IPv4 range

[Nick Hilliard (INEX)]

aleksandr at speed-ix.net wrote on 28/10/2021 14:58:
> We have only one VLAN and we would like to keep it like it is.
> I will be glad to hear any proposal, if not then we will try to find out 
> such a migration plan ourselves.

Hi Aleksandr,

INEX did this in 2016, and we temporarily maintained two mysql instances 
and two www virtual servers.  We announced a change freeze several days 
before the migration, and kept the old IP address database as the 
customer-visible DB.  The new IP address database was manually 
synchronised using mysqldump. On the day of the start of the cut-over, 
we changed the IXP Manager to be the new DB.  When we completed the 
migration 5 days later, the old DB was turned off.

Other than that, all INEX services were replicated (i.e. new set of 
route servers, route collectors, AS112 all built on new IP ranges). This 
also allowed the opportunity to do a full stack upgrade on these (OS, 
Bird versions, configurations - e.g. in that window we enabled large BGP 
community support on the new route servers).

Handling this in a more automated way would probably require a 
substantially more complicated overall systems design.

Nick