The NATS server has many flags to customize its behavior without having to write a configuration file.
The configuration flags revolve around:
Host address to bind to (default:
NATS client port (default: 4222).
File to store the process ID (PID).
HTTP port for monitoring dashboard (exclusive of
HTTPS port monitoring for monitoring dashboard (exclusive of
Path to NATS server configuration file.
Send a signal to nats-server process. See process signaling.
Client HostPort to advertise to other servers.
Test configuration and exit
The following options control straightforward authentication:
Required username for connections (exclusive of
Required password for connections (exclusive of
Required authorization token for connections (exclusive of
The following flags are available on the server to configure logging:
File to redirect log output
Log to syslog or windows event log
The syslog server address, like
Enable debugging output
Enable protocol trace log messages
Enable both debug and protocol trace messages
Maximum printable length for traced messages. 0 for unlimited
You can read more about logging configuration here.
Enable TLS, do not verify clients
Server certificate file
Private key for server certificate
Enable client TLS certificate verification
Client certificate CA for verification
The following flags are available on the server to configure clustering:
Comma-separated list of cluster URLs to solicit and connect
Cluster URL for clustering requests
Do not advertise known cluster information to clients
Cluster URL to advertise to other servers
For implicit routes, number of connect retries
You can read more about clustering configuration here.
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