How to execute host commands by docker

There are two ways to execute the host command in a Docker container: use a privileged container and add the --privileged flag when running the docker run command. Bind the host network namespace to the container and add the --net=host flag when running the docker run command.

How to execute host command in Docker

In a Docker container, the host command cannot be executed directly by default. In order to execute the host command, you need to use a privileged container or a network namespace on the binding host.

Use privileged containers

The easiest way is to run a container with privileged permissions. To do this, add the --privileged flag when running the docker run command:

 <code class="bash">docker run --privileged -it debian bash</code>

In a privileged container, you can now execute the host command:

 <code class="bash">host google.com</code>

Bind the host network namespace

Another way is to bind the network namespace on the host to the container. To do this, add --net=host flag when running docker run command:

 <code class="bash">docker run --net=host -it debian bash</code>

Similar to privileged containers, you can now execute the host command in a container that binds the network namespace:

 <code class="bash">host google.com</code>

It should be noted that when using --net=host option, the container will share the same network namespace as the host. This means that the container will be able to access the same network resources as the host. This can pose a security risk, so use this option only if absolutely necessary.

The above is the detailed content of How to execute host commands by docker. For more information, please follow other related articles on the PHP Chinese website!