Скачать или смотреть Fixing SQLSTATE[HY000] [2002] Connection refused Error in Laravel on Docker

Learn how to resolve the `SQLSTATE[HY000] [2002] Connection refused` error in your Laravel application when using Docker. This guide will walk you through the steps needed to configure your database connection properly.
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Fixing SQLSTATE[HY000] [2002] Connection refused Error in Laravel on Docker

When you're developing a web application with Laravel using Docker, you might encounter the frustrating error: SQLSTATE[HY000] [2002] Connection refused. This error typically indicates that your application is unable to connect to the MySQL database due to configuration issues. But don't worry, we’re here to help you resolve this problem with some simple adjustments!

Understanding the Issue

You’ve set up a Docker environment with a web service and a MySQL database. While the database is accessible, running Laravel commands like php artisan migrate works flawlessly, but when you attempt to access your application in the web browser, you receive the dreaded connection refused error.

The core of the problem lies in how Laravel connects to the MySQL database from within the Docker container.

The Solution: Updating Your Database Connection Configuration

The primary adjustment you need to make is in your .env file, where you specify your database connection settings. Let’s break down the steps.

Step-by-Step Fix

Locate Your .env File:
Find the .env file in the root of your Laravel project. This file contains the environment variables for your application, including database connection details.

Identify the Current DB_HOST:
You may notice a portion of the .env file that looks like this:

[[See Video to Reveal this Text or Code Snippet]]

Update the DB_HOST:
Change the DB_HOST value from 127.0.0.1 to db, which matches the service name of your MySQL container in your docker-compose.yml file. The revised section should look like this:

[[See Video to Reveal this Text or Code Snippet]]

Why This Change is Necessary

Communication Within Docker: When your Laravel application runs inside a Docker container, it does not have access to your local machine's localhost (127.0.0.1). Instead, it communicates with other containers through the Docker network, which uses service names as hostnames.

Service Names Matter: By updating the DB_HOST to db, you provide the application with the correct hostname to reach the MySQL service defined in your docker-compose.yml.

Testing the Changes

Once you’ve made the adjustments:

Rebuild Your Containers: To apply the changes, you may need to rebuild your Docker containers by running:

[[See Video to Reveal this Text or Code Snippet]]

Access Your Application: Open your web browser and navigate to your Laravel application again, and you should find that the connection issue is resolved.

Conclusion

Encountering the SQLSTATE[HY000] [2002] Connection refused error can be frustrating, but with a simple change in your environment configuration, you can get back on track. Remember to always check your database connection settings when working within Docker environments, as they can differ greatly from your local development settings.

By following these steps, you can ensure your Laravel application connects seamlessly to the MySQL database running in Docker, allowing you to focus on what you do best—building great applications!