Rebuild is a catch all update, which can:
- Update Discourse source
- Update OS level dependencies, like Ruby major verson
- Update to newer and incompatible versions of PostgreSQL, where it takes care of updating the data disk format for the newer version
- Update the Docker image. Just as an example, earlier this year we changed from Ubuntu 16.04 to last Debian and all is transparent to the user, just type
./launcher rebuild app.
Rebuilds aren’t necessary all the time, they are mandatory just a few times a year when a huge dependency update happens. For all other updates you can have 0 downtime updates clicking on the web updater in the admin UI.
For more “devops” points, you can try:
and much more at #howto:sysadmin