Best practice for migrating Confluence 3.4.8 to 5.X


I'm currently evaluating the process of migrating our productive instance of Confluence 3.4.8 to a current 5.X version.

Is there a kind of "best practice" for migrating our content to the new version of Confluence?

Whats about attachments and ContentProperties written to pages by used plugins?

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I figured out something like this...

  1. Provide a clone of the production environment for migration issues (with the current data).

  2. Check licence to be able to upgrade.

  3. Upgrade 3.4.8 -> 4.3.7.

  4. Identify unmigrated / masked content by enabling logging for "com.atlassian.confluence.content.render.xhtml.migration".

  5. Restart ./admin/unmigratedwikicontent.action (only available in Confluence 4.x) to see which macros have migration issues.

  6. Fix all problems by removing macros or upgrading. Error example: com.atlassian.confluence.content.render.xhtml.migration.exceptions.UnknownMacroMigrationException: The macro 'sql' is unknown.

  7. Redo 5. until no errors will be logged.
  8. Upgrade to 5.x ...

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