This page explains in detail how to upgrade Moodle. For a summary of the process, see Upgrade overview.
Check the requirements
Check that your server meets all requirements for 2.3 in Settings > Site administration > Server > Environment.
Note: You can only upgrade to Moodle 2.3 from Moodle 2.2 or later. If upgrading from earlier versions, you must upgrade to 2.2 as a first step.
Checking database schema - old sites
If your Moodle site has been upgraded through many prior versions it is possible that there will be some problems with the database schema (compared to a fresh 2.3 installation). This may cause the upgrade to fail. If your site started life prior to Moodle 2.0 it is a very good idea to check and correct the database schema before upgrading. See Verify Database Schema. You should also run the database integrity checks in the XMLDB editor.
Check for plugin updates
Check in the Moodle Plugins directory whether there is a 2.3 version available for any contributed/custom plugins (including themes) that you have previously installed on your site. If so, download the plugin code and copy it to the appropriate location in your Moodle code (see Installing plugins).
The upgrade of the plugin will then happen as part of the Moodle upgrade process.
If an out-of-date plugin causes your upgrade to fail, you can usually delete the plugin code rather than uninstalling it from within Moodle so that the data associated with it is not deleted.
Before you upgrade your site for real
We advise that you test the upgrade first on a COPY of your production site, to make sure it works as you expect.
Backup important data
There are three areas that should be backed up before any upgrade:
- Moodle software (For example, everything in server/htdocs/moodle)
- Moodle uploaded files (For example, server/moodledata)
- Moodle database (For example, the SQL or Postgres database)
See Site backup for more specific information.
Put your Site into maintenance mode
Before you begin upgrading your site, you should put it into maintenance mode to stop any non-admin users from logging in.
Install the new Moodle software
Standard install package
- Move your old Moodle software program files to another location. Do NOT copy new files over the old files.
- Unzip or unpack the upgrade file so that all new the Moodle software program files are in the location the old files used to be in on the server. Moodle will adjust SQL and moodledata if it needs to in the upgrade.
- Copy your old config.php file back to the new Moodle directory.
- As mentioned above, if you had installed any custom plugins on your site you should add them to the new code. It is important to check that you get the correct version for your new version of Moodle. Be particularly careful that you do not overwrite any code in the new version of Moodle.
mv moodle moodle.backup tar xvzf moodle-1.1.tgz
Next, copy across your config.php, any custom plugins, and your .htaccess file if you created one (check that custom plugins are the correct version for your new Moodle first):
cp moodle.backup/config.php moodle cp -pr moodle.backup/theme/mytheme moodle/theme/mytheme cp -pr moodle.backup/mod/mymod moodle/mod/mymod
Don't forget to make moodle/config.php (and the rest of the source code) readable by your www server. Ideally the files should not be writeable by your server.
If you use cron, take care that cron.php is executeable and uses the correct php command:
chmod 740 admin/cli/cron.php (some configurations need chmod 750 or chmod 755) copy the first line from cron.php (if it looks like '#!/usr/local/bin/php' or '#!/usr/local/bin/php5.3', no need to copy '<?php')
You can use Git for updating or upgrading your Moodle. New sites are recommended to use this rather than CVS since all Moodle development has moved to Git. See Git for Administrators for details.
Command line upgrade
On Linux servers, Moodle 2.3 supports running the upgrade from the command line, rather than through a web browser. This is likely to be more reliable, particularly for large sites.
Finishing the upgrade
The last step is to trigger the upgrade processes within Moodle.
To do this just go to Settings > Site administration > Notifications.
Moodle will automatically detect the new version and perform all the SQL database or file system upgrades that are necessary. If there is anything it can't do itself (very rare) then you will see messages telling you what you need to do.
Assuming all goes well (no error messages) then you can start using your new version of Moodle and enjoy the new features!
The config.php file from your 2.2 installation should work fine but if you take a look at config-dist.php that came with Moodle 2.3 there are more/different options available (e.g. database drivers and settings). It's a good idea to map your old config.php settings to a new one based on the 2.3 config-dist.php.
Possible issues that may affect you in Moodle 2.3
Two assignment modules
A new assignment module has been added in Moodle 2.3. The old assignment module is still available (renamed 'Assignments 2.2') and sites which have upgraded from previous versions will have both versions available.
It is recommended that admins upgrade all existing assignments to use the new assignment module as soon as possible, as described in Assignment upgrade tool, then disable the old assignment module, to avoid the confusion of having two assignment modules.
Google registration required for Google Docs and Picasa plugins
Due to a change in Google's service, Moodle 2.3 has switched to a more secure and more user-friendly system for communicating with Google called 'OAuth 2.0'. As a result, any Google Docs and Picasa plugins (the Google Docs and Picasa repositories and the Google Docs and Picasa portfolios) used previously on the site will be disabled when the site is upgraded.
To re-enable these plugins, an administrator must register their site with Google, as described in Google OAuth 2.0 setup, and obtain a client ID and secret. The client ID and secret can then be used to configure all Google Docs and Picasa plugins.
RTL theme fixes
Moodle 2.3 includes many right-to-left (RTL) theme fixes (MDL-30337) and so sites using RTL languages, such as Arabic and Hebrew, are recommended to perform additional testing, particularly with any custom themes to ensure everything is working fine.
MySQL dmlwriteexception error when using calculated questions in a quiz
If you're using MySQL or SQL*Server and you have a problem with duplicated keys with the question_attempt_step_data table when using calculated questions in a quiz (from entering a formula which uses variables with the same characters in different cases), it is recommended that you upgrade to Moodle 3.0.x or higher ASAP. Alternatively, the problematic unique index can be dropped or the collation of the columns changed to be case-sensitive, however this is not considered a complete fix. See MDL-29332 for more information.