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Learn how to resolve the issue of HTTP links in a WordPress site after migrating to Docker, ensuring secure connections.
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Fixing HTTP Links in WordPress After Migrating to Docker: A Step-by-Step Guide

Introduction

When migrating a WordPress site from a cPanel environment to a Docker setup, many users encounter issues with asset links defaulting to http:// instead of the secure https://. This can lead to serious security concerns, especially if your users are interacting with sensitive data. In this guide, we'll dive into the mechanics behind how links to assets are built in WordPress and provide detailed steps on how to ensure they are served over HTTPS after moving to Docker.

Understanding the Problem

In a typical environment, you might configure your WordPress site to support both http and https. This flexibility allows users to access your site through both protocols while keeping all internal links (like JavaScript and CSS files) consistent with the secure protocol.

Common Issues After Migration

HTTP Links: After the migration, when accessing your site, you may notice that all internal links are still using http, which ruins the security aspect of your site.

Inaccessible Admin Section: Attempting to enforce HTTPS may result in problems accessing the WordPress admin panel (/wp-admin), showing an error message stating that you are not allowed to visit the page.

Traefik Configuration: If you're using Traefik as a load balancer, incorrect rules or configurations could lead to mismanagement of how HTTPS is handled.

Digging Into the Solution

Step 1: Modify wp-config.php

The issue primarily lies in the order of directives within the wp-config.php file, which may cause WordPress to misinterpret how to handle secure connections. Follow these steps:

Open your wp-config.php file: This file contains crucial settings for your WordPress installation, including database connection details and security keys.

Insert the HTTPS directive: You need to ensure that the following line is placed before the final line of your configuration file:

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

Step 2: Enforce SSL for Admin Access

When configuring HTTPS, make sure to add the following lines immediately after the HTTPS directive:

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

These directives force the WordPress login and admin sections to utilize HTTPS.

Step 3: Test the Configuration

After saving your changes in wp-config.php:

Clear your browser cache or perform a hard refresh.

Visit your WordPress site and check the URLs of your assets to ensure they are now served over https://.

Access the admin section to confirm that it functions correctly without issues.

Step 4: Troubleshooting Common Errors

If you still face problems accessing /wp-admin, check for the following:

Server Configuration: Ensure your Docker’s Apache configuration allows for HTTPS connections.

Traefik Rules: Verify that your Traefik setup routes requests to both HTTP and HTTPS correctly.

Conclusion

Migrating a WordPress site to Docker while ensuring secure connections can feel daunting, especially when you encounter unexpected issues like HTTP links. However, by adjusting the settings in your wp-config.php and ensuring that your server configurations are correctly set, you can ensure that your site operates securely and efficiently.

If you follow these steps and still face challenges, don't hesitate to reach out to community forums or consult the official WordPress documentation for further assistance. Keep your site secure and functional, and enjoy your new Docker environment!