What to do if nginx server is hung

When the Nginx server goes down, you can perform the following troubleshooting steps: Check that the nginx process is running. View the error log for error messages. Check the syntax of nginx configuration. Make sure nginx has the permissions you need to access the file. Check file descriptor to open limits. Confirm nginx is listening on the correct port. Add firewall rules to allow nginx traffic. Check reverse proxy settings, including backend server availability. For further assistance, please contact technical support.

Troubleshooting nginx server downtime

When the nginx server goes down, take the following steps to troubleshoot:

1. Check nginx process

• Use the ps aux | grep nginx command to check if nginx is running.
• If there is no nginx process, use the nginx command to start nginx.

2. Check the log file

• Check nginx's error log (usually located in /var/log/nginx/error.log ) for error messages.
• Common error examples: configuration errors, file permission issues, resource restrictions.

3. Check the configuration

• Use nginx -t command to check whether the nginx configuration syntax is correct.
• Double-check virtual host configuration, error log location, and any custom settings.

4. Check file permissions

• Ensure nginx has the permissions you need to access its configuration files, log files, and website files.
• Check file permissions using ls -la /etc/nginx/nginx.conf and other related files.

5. Check resource limitations

• Use the ulimit -n command to check the maximum number of file descriptors opened by the nginx process.
• If the limit is too low, use ulimit -n <new_limit></new_limit> to increase the limit.

6. Check network connection

• Make sure nginx listens for the correct ports (usually 80 and 443).
• Use netstat -tulpn | grep nginx command to check whether nginx is listening on the port.

7. Check the firewall

• Confirm that the firewall allows nginx traffic.
• Add necessary firewall rules to allow traffic on port 80 and/or 443.

8. Check the reverse proxy settings

• If nginx is used as a reverse proxy, check that the reverse proxy configuration is correct.
• Verify the availability and response time of the backend server.

9. Contact Technical Support

• If the above steps do not resolve the issue, please contact nginx technical support or system administrator for further assistance.

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