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silverstripe-framework/docs/en/installation/upgrading.md

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Upgrading

Usually an update or upgrade to your SilverStripe installation just means overwriting files and updating your database-schema.

See our upgrade notes and changelogs for release-specific information.

Process

  • Check if any modules (e.g. blog or forum) in your installation are incompatible and need to be upgraded as well
  • Backup your database content
  • Backup your webroot files
  • Download the new release and uncompress it to a temporary folder
  • Leave custom folders like mysite or themes in place.
  • Identify system folders in your webroot (cms, framework, sapphire and any additional modules).
  • Delete existing system folders (or move them outside of your webroot)
  • Extract and replace system folders from your download (Deleting instead of "copying over" existing folders ensures that files removed from the new SilverStripe release are not persisting in your installation)
  • Visit http://localhost/dev/build/?flush=1 to rebuild the website database
  • Check if you need to adapt your code to changed PHP APIs
  • Check if you have overwritten any core templates or styles which might need an update
  • See common-problems for a list of likely mistakes that could happen during an upgrade.
Never update a website on the live server without trying it on a development copy first.

Decision Helpers

How easy will it be to update my project? It's a fair question, and sometimes a difficult one to answer.

  • "Micro" releases (x.y.z) are explicitly backwards compatible, "minor" and "major" releases can deprecate features and change APIs (see our [/misc/release-process](release process) for details)
  • If you've made custom branches of SilverStripe core, or any thirdparty module, it's going to be harder to upgrade.
  • The more custom features you have, the harder it will be to upgrade. You will have to re-test all of those features, and adapt to API changes in core.
  • Customisations of a well defined type - such as custom page types or custom blog widgets - are going to be easier to upgrade than customisations that modify deep system internals like rewriting SQL queries.

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