Upgrading to Plone 4

It is now time to explore upgrading to Plone 4.

Nowadays, as far as the software itself is concerned, this is a relatively simple process.

Especially as far as our buildout.cfg file is concerned, it is simple.

At the time of this writing, Plone 4 is just about to release its first release candidate. This means that we can experiment with the most recent beta release—beta 3.

For Plone 4 beta 3's versions.cfg file, visit http://dist.plone.org/release/4.0b3/versions.cfg.

Even though we have already specified a versions.cfg, we can specify another one, because Buildout will just use the last specified value for each parameter.

In the case of a versions section that looks like as shown, Buildout will use the latter version:

[versions]
Plone = 3.3.5
Plone = 4.0b3

Effectively, extending the Plone 4 beta 3 versions.cfg file and executing Buildout upgrades your software stack (but not your database) to Plone 4 beta 3.

There are a few additional concerns we must address before you do...