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== Operational notes == * Restart services with <code>systemctl restart nginx|nodeapp</code>. * Application logs: <code>journalctl -u nodeapp</code>. It exits nonzero if /opt/app/config.json is missing or the database is unreachable. * The database is PostgreSQL on [[Db1]], port 5432, reachable only from inside the network. If the app reports database errors, check db1 too - but remember this agent may only diagnose there, not change anything. * Disk pressure history: log growth under /var/log has filled the disk before. Safe to delete old files in /var/log/app-debug/. * Monitoring: Icinga checks website, nodeapp and disk on cust1, and postgres and disk on db1, from the ops core host.
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