[TYPO3-english] Advice on upgrading 4.2.12

[Bernd Wilke]

On Tue, 15 Nov 2011 22:19:22 +0100, Jigal van Hemert wrote:

> Hi,
> 
> On 15-11-2011 19:52, yanagik317 at netscape.net wrote:
>> I like/need to upgrade this, preferably to a new RHEL 6 server running
>> PHP 5.3.x and maybe to the latest Typo3 4.4.x.  I'm a little hesitant
>> to move to Typo3 4.5 in this particular downtime I can get
> 
> I'd personally go in steps to the latest version:
> 
> 1. Make sure I have the latest version of the extensions which are
> compatible with 4.2 / PHP 5.2 on the site. Make backups and try upgrades
> of each version.
> 
> 2. Move the installation to the PHP 5.3 server. Don't try to run it, but
> upgrade the core to 4.3. Run upgrade wizards, etc. and see if we can get
> this running. Upgrade extensions and test if everything runs correctly.
> If necessary use alternative extensions. Keep a log of all the steps
> taken to achieve a running site
> 
> 3. Upgrade to 4.4, upgrade extensions, test, test, test. Keep a log of
> all steps taken.
> 
> 4. Upgrade to 4.5 and later 4.6.
> 
> 5. Test thoroughly until you're certain everything runs fine.
> 
> Now you've made a test migration which hopefully ended with a fully
> working site. If you're satisfied you have detailed instructions to
> repeat the process at the time when you want to migrate the site.
> 
> This leaves the current site running on the old server and you have
> plenty of time to figure out how to fix the issues you might find.
> 
> If step 2 doesn't work out you can try to upgrade to 4.3 first on the
> old server (make backups!) and then move to the new server. 4.3 and
> higher are designed to work on PHP 5.3 too.

just in case: make full database-backups before each step: the upgrades 
will change your database structure which can't be reverted the easy way.
also there might be needed another step with 4.5: changing the database 
to utf-8 [¹]


[¹] helpfull script: 
http://wiki.typo3.org/
UTF-8_support#Convert_an_already_existing_database_to_UTF-8

bernd
-- 
http://www.pi-phi.de/t3v4/cheatsheet.html