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Test the nginx configuration and reload only on success

caution rootnginxdebian, ubuntu

Caution: This command changes the system. Understand what it does before you run it.

root@server
nginx -t && systemctl reload nginx

Checks the configuration and reloads it with reload without dropping existing connections. The old workers finish their running requests while new workers take over with the new configuration. If the test fails, nothing happens and the service keeps running with the old configuration.

Note: On Plesk, manual changes to generated files are overwritten during the next reconfiguration. Custom directives belong in the domain’s additional nginx directives.

Also searched as

  • nginx reload config
  • reload nginx without downtime
  • apply nginx config changes
  • safely restart nginx

Related one-liners

All in nginx

Check the nginx configuration for syntax errors

#nginx -t
harmlessnginx

Check whether nginx is enabled in Plesk

#plesk sbin nginxmng --status
harmlessnginx

Find the cause of a 502 Bad Gateway in the nginx log

#grep -E "upstream|connect\(\) failed" /var/log/nginx/error.log | tail -20
harmlessnginx

Show all nginx server_name entries with their config file

#nginx -T 2>/dev/null | grep -E "^# configuration file|server_name "
harmlessnginx

Show the additional nginx directives of a Plesk domain

#cat /var/www/vhosts/system/example.com/conf/vhost_nginx.conf
harmlessnginx

Show the nginx configuration Plesk generated for a domain

#cat /var/www/vhosts/system/example.com/conf/nginx.conf
harmlessnginx

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