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NATS

Also refer to the troubleshooting section of the SEAL NATS documentation.

Activate NATS Monitoring

To check the NATS status, you can enable the monitoring port in nats.conf.

  1. Open the NATS configuration file in an editor.

    • Windows: C:\ProgramData\SEAL Systems\config\nats.conf

    • Linux: /opt/seal/etc/nats.conf

  2. Activate the NATS monitoring port:

    # HTTP monitoring port
monitor_port: 8222

  3. Restart NATS.

    plossys service stop seal-nats
plossys service start seal-nats

  4. If extern access to NATS monitoring is needed, open firewall port 8222.

  5. Open NATS monitoring in a browser.

    http://localhost:8222

  6. Cluster connections can be seen under General.

    Preview of NATS Monitoring in the browser

Check the NATS Connection

Use the NATS CLI to check the connection to a NATS server.

  1. Open a command prompt.

  2. Switch to the NATS installation directory. The NATS CLI is not in the search path of the operating system.

    • Windows: cd "C:\Program Files\SEAL Systems\seal-nats"
    • Linux: cd /opt/seal/seal-nats

  3. Check the connection:

    • Windows: .\nats.exe server check connection [-s nats://<hostname>:4222]
    • Linux: ./nats server check connection [-s nats://<hostname>:4222]

Activate NATS Debug and Trace Logging

In most cases, the standard NATS log already contains enough information to diagnose a problem.

Caution - log file size

Only activate trace logging in an emergency. The log file grows very quickly to an enormous size.

  1. Open the NATS configuration file in an editor.

    • Windows: C:\ProgramData\SEAL Systems\config\nats.conf
    • Linux: /opt/seal/etc/nats.conf

  2. Add or activate the following lines:

    debug: true
trace: true

  3. Restart NATS.

    plossys service stop seal-nats
plossys service start seal-nats
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