Flags
The NATS server has many flags to customize its behavior without having to write a configuration file.
The configuration flags revolve around:
  • Server Options
  • Logging
  • Authorization
  • TLS Security
  • Clustering
  • Information

Server Options

Flag
Description
-a, --addr
Host address to bind to (default: 0.0.0.0 - all interfaces).
-p, --port
NATS client port (default: 4222).
-P, --pid
File to store the process ID (PID).
-m, --http_port
HTTP port for monitoring dashboard (exclusive of --https_port).
-ms, --https_port
HTTPS port monitoring for monitoring dashboard (exclusive of --http_port).
-c, --config
Path to NATS server configuration file.
-sl, --signal
Send a signal to nats-server process. See process signaling.
--client_advertise
Client HostPort to advertise to other servers.
-t
Test configuration and exit

JetStream Options

Flag
Description
-js, --jetstream
Enable JetStream functionality.
-sd, --store_dir
Set the storage directory.

Authentication Options

The following options control straightforward authentication:
Flag
Description
--user
Required username for connections (exclusive of --token).
--pass
Required password for connections (exclusive of --token).
--auth
Required authorization token for connections (exclusive of --user and --password).
See token authentication, and username/password for more information.

Logging Options

The following flags are available on the server to configure logging:
Flag
Description
-l, --log
File to redirect log output
-T, --logtime
Specify -T=false to disable timestamping log entries
-s, --syslog
Log to syslog or windows event log
-r, --remote_syslog
The syslog server address, like udp://localhost:514
-D, --debug
Enable debugging output
-V, --trace
Enable protocol trace log messages
-VV
Verbose trace (traces system account as well)
-DV
Enable both debug and protocol trace messages
-DVV
Debug and verbose trace (traces system account as well)
--max_traced_msg_len
Maximum printable length for traced messages. 0 for unlimited
You can read more about logging configuration here.

TLS Options

Flag
Description
--tls
Enable TLS, do not verify clients
--tlscert
Server certificate file
--tlskey
Private key for server certificate
--tlsverify
Enable client TLS certificate verification
--tlscacert
Client certificate CA for verification
You can read more about tls configuration here.

Cluster Options

The following flags are available on the server to configure clustering:
Flag
Description
--routes
Comma-separated list of cluster URLs to solicit and connect
--cluster
Cluster URL for clustering requests
--no_advertise
Do not advertise known cluster information to clients
--cluster_advertise
Cluster URL to advertise to other servers
--connect_retries
For implicit routes, number of connect retries
You can read more about clustering configuration here.

Common Options

Flag
Description
-h, --help
Show this message
-v, --version
Show version
--help_tls
TLS help
Last modified 10d ago