Hi Till, Hi Falko,
now that Wheezy is released and support for Squeeze is ending soon (
, I started planing how to proceed with my cluster setup.
At the moment I run two servers that are still on ISPConfig 3.0.3 and that are clustered mainly according to your original cluster tutorial (with glusterfs) with the only notable exception that the databases are not on the gluster fs volume but replicated through MySQL and stunnel. (the two servers are located @hetzner with a failover ip)
I think I have mainly two options to proceed, but I am unsure how ispconfig will handle this (or what I would have to handle):
A. Just take the two servers, upgrade ispconfig and upgrade to wheezy...
B. Ordner two new servers, set it up with wheezy an migrate over with the ispconfig installation. Preferrably with the move to new servers I would also like to replace gluster fs with something like unsion and move from courier to dovecot.
At the moment I would prefer the second option because of the much better hardware for the same price.
How does ISPConfig handle the distribution specific parts? Is it save to migrate from a squeeze installation to a wheezy installation (as it is described in various threads - but these were always about migrating between the same base distributions, afaik)
When setting up the ispconfig servers I suffered from the bug with the different user ids in the cluster setup (Note: I don't blame you for this! It was a bug and this happens... ispconfig is despite definitely the best admin panel out there, including the commercial alternatives. It was just a hell lot of work to fix this and I was happy with the afterwards very well working system, so I was reluctant to upgrade). Meanwile Ispconfig got the option to sync user ids to systems ids. Can this be enabled in an existing installation (after upgrading from 3.0.3 to 3.0.5) or is this only applicable for "fresh" installations?
If I would only upgrade the existing servers, what would be the right order in a cluster setup. I guess, there might come up inconsistencies if one server is still on "Squeeze" and the other server is on "Wheezy" already or can ispconfig handle this transparently?
A lot to read... sorry. But there are quite some questions in my head how to do the upgrade with minimum downtime (as least as minimum as such a small setup permits