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Getting Started
Getting started with JetStream is straightforward. While we speak of Jetstream as if it is a seperate component, it's actually a subsystem built into the NATS server that needs to be enabled.
Command line
Enable JetStream by specifying the -js flag when starting the NATS server.
$ nats-server -js
Configuration File
Enable JetStream through a configuration file. By default, the JetStream subsytem will store data in the /tmp directory. Here's a minimal file that will store data in a local "nats" directory, suitable for development and local testing.
$ nats-server -c js.conf
# js.conf
jetstream {
store_dir=nats
}
Normally JetStream will be run in clustered mode and will replicate data, so the best place to store JetStream data would be locally on a fast SSD. One should specifically avoid NAS or NFS storage for JetStream.
See Using Docker and Using Source for more information.