Nuclos installation FAQ: startup problems, production checklist, updates, HTTPS/TLS configuration and server locale.

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hammer and wrench Installation FAQ

Common questions about installation, production use, updates and HTTPS.

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Nuclos won't start

If the installation succeeded but Nuclos won't start, server.log in <NUCLOS-HOME>/logs reveals the cause. You can post the log in the Nuclos forum.

Checklist before going to production

Server & client

  • 64-bit OS and current Java (11 recommended).
  • Secure the client↔server connection via HTTPS (TLS).
  • Fast network between server and database (ideally same host, or 1/10 GBit).

Backups

  • Regular automatic DB backups plus system backups of DB and Nuclos hosts.
  • Keep backups in a separate location and test restores regularly.
  • Back up the Nuclos base directory (incl. /data).

Maturity

  • Configuration tested; Nuclos ran for several weeks in parallel/test operation without issues.

Updating to a newer Nuclos version

Updates are largely automatic. Still:

Configure HTTPS / TLS

HTTPS needs an X.509 certificate stored in a keystore, specified during installation. Obtain it from a CA or create one with the Java tool keytool:

keytool -genkeypair -keystore .keystore -storepass changeit

A self-signed certificate is no substitute for a CA certificate and triggers security warnings. In production always use a CA certificate and run Nuclos over HTTPS only.

With modern Java (8u161+, 11, 17) Unlimited Strength is enabled by default – the old JCE policy files are no longer needed.

Server locale (Linux)

For correct date/number formats the server should run with the appropriate locale. Check with:

locale

Adjust it per your OS documentation if needed.

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