All nodes in a Cluster should have a synchronized system date-time.

All nodes share sandboxes stored on a shared or replicated filesystem. The filesystem shared among all nodes is a single point of failure. Thus, the use of a replicated filesystem is strongly recommended.

All nodes share a DB, thus it must support transactions. For example, the MySQL table engine, MyISAM, may cause unusual behavior because it is not transactional.

All nodes share a DB, which is a single point of failure. Use of a Clustered DB is strongly recommended.

Configure the license using the license.file property or upload it in the Web GUI, so it is stored in the database.