How to get the IP address of the docker host from inside a docker container?

To get the IP address of the Docker host from inside a Docker container, you can use the docker.for.mac.localhost hostname. This hostname resolves to the IP address of the Docker host when used from inside a Docker container on a Mac.

Here's an example of how you can get the IP address of the Docker host from inside a Docker container:

1. Run the following command to start a Docker container:

    

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   docker run -it alpine /bin/sh
   

   This will start a new Docker container based on the Alpine Linux image and open an interactive shell inside the container.

2. Once inside the container, run the following command to get the IP address of the Docker host:

    

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   ping docker.for.mac.localhost
   

   This will send a ping request to the docker.for.mac.localhost hostname, which will resolve to the IP address of the Docker host.

   Alternatively, you can run the following command to get the IP address directly:

    

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   ifconfig | grep "inet " | grep -Fv 127.0.0.1 | awk '{print $2}'
   

   This command uses ifconfig to get a list of network interfaces and their IP addresses, then uses grep and awk to filter out the loopback address (127.0.0.1) and print the IP address of the first non-loopback interface. This should be the IP address of the Docker host.

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