Running and deploying a NATS Server

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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:
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nats-server
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Output
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[61052] 2021/10/28 16:53:38.003205 [INF] Starting nats-server
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[61052] 2021/10/28 16:53:38.003329 [INF]   Version:  2.6.1
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[61052] 2021/10/28 16:53:38.003333 [INF]   Git:      [not set]
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[61052] 2021/10/28 16:53:38.003339 [INF]   Name:     NDUP6JO4T5LRUEXZUHWXMJYMG4IZAJDNWETTA4GPJ7DKXLJUXBN3UP3M
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[61052] 2021/10/28 16:53:38.003342 [INF]   ID:       NDUP6JO4T5LRUEXZUHWXMJYMG4IZAJDNWETTA4GPJ7DKXLJUXBN3UP3M
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[61052] 2021/10/28 16:53:38.004046 [INF] Listening for client connections on 0.0.0.0:4222
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[61052] 2021/10/28 16:53:38.004683 [INF] Server is ready
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...
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Docker
If you are running your NATS server in a docker container:
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docker run -p 4222:4222 -ti nats:latest
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Output
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[1] 2021/10/28 23:51:52.705376 [INF] Starting nats-server
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[1] 2021/10/28 23:51:52.705428 [INF]   Version:  2.6.1
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[1] 2021/10/28 23:51:52.705432 [INF]   Git:      [c91f0fe]
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[1] 2021/10/28 23:51:52.705439 [INF]   Name:     NB32AP7VSM3FTKTVEGPQ3OZWSE4T7PQDVJSJMGYFIDKJA6TQEZMV2JNN
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[1] 2021/10/28 23:51:52.705446 [INF]   ID:       NB32AP7VSM3FTKTVEGPQ3OZWSE4T7PQDVJSJMGYFIDKJA6TQEZMV2JNN
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[1] 2021/10/28 23:51:52.705448 [INF] Using configuration file: nats-server.conf
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[1] 2021/10/28 23:51:52.709505 [INF] Starting http monitor on 0.0.0.0:8222
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[1] 2021/10/28 23:51:52.709590 [INF] Listening for client connections on 0.0.0.0:4222
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[1] 2021/10/28 23:51:52.709882 [INF] Server is ready
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[1] 2021/10/28 23:51:52.710394 [INF] Cluster name is 3tlKqFWx91wnnAekR76U9V
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[1] 2021/10/28 23:51:52.710419 [WRN] Cluster name was dynamically generated, consider setting one
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[1] 2021/10/28 23:51:52.710446 [INF] Listening for route connections on 0.0.0.0:6222
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...
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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.
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nats-server -c js.conf
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# js.conf
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jetstream {
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   store_dir=nats
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}
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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 containerized NATS is available here.
Installing a NATS Server
NATS and Docker
Last modified 10d ago
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