About upgrade and building without caldav/carddav server

[Nic Bernstein]

Egoitz,
Some important notes on this upgrade.  Firstly, I have followed this 
path for a client, and it does work.  Secondly, you should read not just 
the Upgrade document to which Nicola has linked (below) but also read 
the release notes for all intermediary versions.

You can find those here:
     https://www.cyrusimap.org/imap/download/release-notes/index.html

It's always best practice to read intermediary release notes, as changes 
made in one version (i.e. 2.4.0) may not be mentioned in a later 
version's release notes.

For example, the release notes for 2.4.0 contain this note:

  * All databases are now default skiplist, and ctl_cyrusdb will
    automatically convert database type on startup.

That's a really good thing, but if you previously set your database 
types to something other than the default, then they will not be 
converted (maybe you didn't do so, but your packages may have).  As the 
Upgrade document notes, in that case you should convert your DB formats 
to a default /before/ you copy them to the new server, using cvt_cyrusdb 
(for example):

    cvt_cyrusdb /<confdir>/mailboxes.db berkeley /tmp/new-mailboxes.db skiplist

Another big note is that with 3.0.X, the Squat full-text indexing engine 
may be replaced with Xapian.  Check your packaging or build for that.  
If it is, you'll need to rebuild your indexes before people can use them.

Similarly, the main Cyrus index scheme has changed between 2.3 and 2.4, 
and then again with 2.5 and 3.0.  You can upgrade from 2.3 to 3.0, and 
it does so very nicely, but while a 3.0 server can read the older index 
formats, you won't get the best behavior or performance.  Run the 
command 'reconstruct -V max' either just like that (upgrade all 
mailbox's indices) or within a script which walks through your user list.

Lastly, please get yourself logged in to #cyrus on IRC so you can get 
support while you're working.  Try a dry run with just a couple of users 
or mailboxes, to see what you might face, and don't be afraid to ask for 
help.  I've been working with Cyrus for twenty years, and I still ask 
for help all the time (just ask the folks on this list!). :-)

Cheers,
     -nic

On 06/27/2017 06:36 PM, Nicola Nye wrote:
>
>>
>>> By the way, when upgrading from a 2.3.1X server... can you directly 
>>> install a 3.0 in the server and should it work?. Is it recommended 
>>> to perhaps go thought the 2.5 version, reconvert
>>>
>>> databases to suit it's needs (the 2.5 needs) and later pass to 3.0?.
>>>
>>
>> I have no experience with upgrading from 2.3 to 3.0, so can't help 
>> you with that.
>
> When writing the Upgrade documentation 
> (https://www.cyrusimap.org/imap/download/upgrade.html) we did discuss 
> whether you had to go through intermediate versions on the way to 3.0, 
> and the answer is a 'no'! You should be able to go from 2.3 to 3.0 in 
> one hit.
>
> As always, make sure you have backups of your data before you begin 
> the upgrade.
>
> Let us know how it goes!
>
>     Nicola
>
>
>
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-- 
Nic Bernstein                             nic at onlight.com
Onlight Inc.                              www.onlight.com
6525 W Bluemound Rd., Ste 24	          v. 414.272.4477
Milwaukee, Wisconsin  53213-4073	  f. 414.290.0335

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