Firstly, it is recommended that you always perform a database backup before doing an upgrade.
The easiest way to upgrade rhodecode is to run:
easy_install -U rhodecode
pip install --upgrade rhodecode
Then make sure you run the following command from the installation directory:
paster make-config RhodeCode production.ini
This will display any changes made by the new version of RhodeCode to your current configuration. It will try to perform an automerge. It's always better to make a backup of your configuration file before hand and recheck the content after the automerge.
Please always make sure your .ini files are upto date. Often errors are caused by missing params added in new versions.
It is also recommended that you rebuild the whoosh index after upgrading since the new whoosh version could introduce some incompatible index changes. Please Read the changelog to see if there were any changes to whoosh.
The final step is to upgrade the database. To do this simply run:
paster upgrade-db production.ini
This will upgrade the schema and update some of the defaults in the database, and will always recheck the settings of the application, if there are no new options that need to be set.