The nats-server has many command line options. To get started, you don't have to specify anything. In the absence of any flags, the NATS server will start listening for NATS client connections on port 4222. By default, security is disabled.
Standalone
When the server starts it will print some information including where the server is listening for client connections:
If you are running your NATS server in a docker container:
docker run -p 4222:4222 -ti nats:latest
[1] 2021/10/28 23:51:52.705376 [INF] Starting nats-server
[1] 2021/10/28 23:51:52.705428 [INF] Version: 2.6.1
[1] 2021/10/28 23:51:52.705432 [INF] Git: [c91f0fe]
[1] 2021/10/28 23:51:52.705439 [INF] Name: NB32AP7VSM3FTKTVEGPQ3OZWSE4T7PQDVJSJMGYFIDKJA6TQEZMV2JNN
[1] 2021/10/28 23:51:52.705446 [INF] ID: NB32AP7VSM3FTKTVEGPQ3OZWSE4T7PQDVJSJMGYFIDKJA6TQEZMV2JNN
[1] 2021/10/28 23:51:52.705448 [INF] Using configuration file: nats-server.conf
[1] 2021/10/28 23:51:52.709505 [INF] Starting http monitor on 0.0.0.0:8222
[1] 2021/10/28 23:51:52.709590 [INF] Listening for client connections on 0.0.0.0:4222
[1] 2021/10/28 23:51:52.709882 [INF] Server is ready
[1] 2021/10/28 23:51:52.710394 [INF] Cluster name is 3tlKqFWx91wnnAekR76U9V
[1] 2021/10/28 23:51:52.710419 [WRN] Cluster name was dynamically generated, consider setting one
[1] 2021/10/28 23:51:52.710446 [INF] Listening for route connections on 0.0.0.0:6222
...
Running nats-server as a systemd service on Linux
You can easily and quickly use systemd to start (and restart if needed) the nats-server process.
JetStream
Remember that in order to enable JetStream and all the functionalities that use it you need to enable it on at least one of your servers
Command Line
Enable JetStream by specifying the -js flag when starting the NATS server.
$ nats-server -js
Configuration File
You can also 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.
Please see the example files located in the util directory of the that you can use to generate your own /etc/systemd/system/nats.service file.
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. More information on .
