Overall tips for upgrade a SonarQube instance from 5.4 to 5.6 LTS.
- If you are using MariaDB as your database, please make sure to read the post SonarQube database migration: MariaDB 5.5 to MySQL 5.7.
- Ignore the upgrade steps provided by the application. They are incomplete. If you execute them, the upgrade will finish with success but no rules will be enabled after that. Instead, execute the steps provided in this StackOverflow comment.
- If you are using C++ community plugin, make sure that you are using at least version 0.9.6.
- Ensure that you have Java 8.
