In order to run NATS Streaming Server in clustered mode, you need to specify a persistent store. At this time you have the choice between
The NATS Streaming Server stores server meta information and messages to the storage you configure using the
However, in clustered mode, we use RAFT for leader election. The raft layer uses its own stores which are currently necessarily file based. The location of the RAFT stores defaults to the current directory under a sub-directory named after the cluster ID, or you can configure it using
Important if using a SQL Store:
There is still a need for storing RAFT data on the file system.
Each node in the cluster needs to have its own "database", that is, no two nodes should share the same tables.