Why host.docker.internal is NOT resolving my internal IP
Stefan Bogdanescu
Founder & Senior Architect · 2026-06-29
You are trying to connect your Laravel application inside the docker container to your MySQL service running on the host operating system by using host.docker.internal. It appears this connection method isn't working as expected, despite successfully connecting via a direct internal IP address of the host machine. In this blog post, we will discuss possible reasons why host.docker.internal is not resolving your internal IP and provide suggestions to improve your setup.
1: DNS issues: It's possible that there are DNS issues within the container causing host.docker.internal to fail. Try adding a custom DNS server or manually configuring hostnames inside your containers using /etc/hosts file. Alternatively, use a network plugin like Weave Net or Flannel for easier configuration.
2: Firewall issues: Ensure the correct firewalls are enabled on both the container and host machine to allow traffic between them. Inspect your firewall logs to verify if there's some blocking happening.
3: Networking configuration: Make sure your Docker networking is configured correctly, including enabling host.docker.internal in /etc/hosts file on the host machine and enabling network_mode to host. You might need to create a custom network configuration if you're using a cloud provider or a VPN.
4: Docker engine version: Ensure your Docker engine, Docker desktop, and docker-compose versions are up-to-date. Sometimes bugs and known issues in older versions can lead to connectivity issues with host.docker.internal. Upgrade your Docker environment if necessary.
5: Container's network configuration: Verify the container's network configuration by using docker inspect command or checking the YAML file for your service definition. Ensure that the network_mode is set to host and the correct DNS servers are specified.
6: Container's hostname: To ensure predictable name resolution, it can be helpful to set your container's hostname and dns_search options. This helps the container to resolve its own IP address through its hostname.
7: Network plugins: Explore using network plugins like Weave Net or Flannel, which can simplify connecting containers to your localhost and make it easier to resolve IP addresses without needing host.docker.internal. These tools provide a standardized interface for managing container networking.
8: Reboot: Sometimes, simply rebooting your system or restarting the Docker daemon can fix connectivity issues with host.docker.internal. This ensures that all networking components are in a stable state and ready to work with each other.
In summary, ifhost.docker.internal is not resolving your internal IP address, you should check for DNS issues, firewall configuration, network settings, container configurations, or consider using alternatives like Weave Net or Flannel for seamless connectivity. Additionally, double-checking any custom local DNS settings might be necessary to ensure smooth communication between the dockerized application and your host database service.