Fixing WordPress Database Connection Errors in Docker
Database connection errors in Docker are typically caused by using localhost instead of the container service name in wp-config.php.
Based on 9 community reports.
Linked sources: 6.
Known Issues
- Incorrect DB_HOST value in wp-config.php
- Database container not fully initialized before WordPress starts
- Insufficient user permissions in MySQL/MariaDB
- Docker network resolution failures
Community Q&A
Why do I get a database connection error in Docker?
You are likely using ’localhost’ as the DB_HOST. In Docker, you must use the service name defined in your docker-compose.yaml file.
How do I fix WordPress database connection issues?
Verify your DB_HOST matches the container name, ensure the database container is running, and check that your credentials have proper permissions.
Does WordPress support localhost for database connections in Docker?
No, ’localhost’ refers to the WordPress container itself, not the database container. Use the service name (e.g., ‘db’) instead.
Reddit Sources
- How I Stopped Brutal WordPress Attacks Using Fail2Ban on Ubuntu VPS (r/Wordpress)
- Built a complete 3D product configurator system for WordPress/WooCommerce with containerized architecture - sharing the technical approach (r/Wordpress)
- Docker+Wordpress+Caddy = The REST API encountered an error (cURL error 28 or 7) (r/Wordpress)
- Database issues with Wordpress Duplicator plugin and local Docker setup (r/Wordpress)
- Database connection error in Docker with MariaDB (r/Wordpress)
- EasyInstall - The WordPress Stack That Heals Itself (AI-Powered + Per-Site Redis) 🤖💪 (r/Wordpress)