based on user reports and queries over the last 24 hours
Nginx outage statistics
- Email: nginx-en@nginx.org
- Official website: https://nginx.org
- X: https://x.com/nginxorg
- Incorrect syntax in configuration files can prevent startup
- Missing semicolons at the end of directives are common mistakes
- Use 'nginx -t' command to test configuration before reloading
- Check error logs at '/var/log/nginx/error.log' for specific issues
- Web server requires proper permissions to access files and directories
- Ensure Nginx user has read access to web root directories
- Check that file permissions are set correctly (typically 644 for files, 755 for directories)
- Verify ownership of files matches the Nginx user or group
- Another service might be using port 80 or 443
- Use 'netstat -tulpn | grep :80' to check for conflicts
- Stop conflicting services or configure Nginx to use different ports
- Check firewall settings that might block access to required ports
- Expired or invalid SSL certificates cause HTTPS connection failures
- Certificate chain issues may prevent proper SSL handshake
- Ensure private key matches the certificate and has proper permissions
- Use tools like OpenSSL to verify certificate validity and configuration
- Excessive worker processes or connections can overload system resources
- Optimize worker_processes and worker_connections settings in nginx.conf
- Implement rate limiting to prevent abuse and resource exhaustion
- Use caching strategies to reduce backend processing load
- Poorly configured buffers and timeouts can impact performance
- Optimize buffer sizes for headers and body content
- Adjust keepalive_timeout and client_header_timeout settings
- Implement gzip compression to reduce bandwidth usage
- Improper IP restrictions or authentication configuration
- Verify allow/deny directives in location blocks
- Check authentication requirements for protected areas
- Ensure proper redirect rules for access control scenarios
- Backend server connectivity issues through proxy setup
- Verify proxy_pass directives point to correct backend addresses
- Check proxy buffers and timeouts for optimal performance
- Ensure proper headers are passed to backend servers
- Rapidly growing log files can consume disk space
- Implement log rotation using logrotate utility
- Monitor log file sizes and implement retention policies
- Use access and error logs for troubleshooting and performance monitoring
Nginx
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