How to create a Dockerfile from Docker container?

While it's not possible to directly convert a running Docker container into a Dockerfile, you can manually create a Dockerfile by inspecting the container's inner filesystem and configurations. Do the steps below:

1. Start by running the following command:

   `docker export` 

   This will allow you to export the container's filesystem as a tarball (an archive file).
2. Then, you can examine its contents to identify the installed packages, dependencies, and configurations.
3. Once you've done this, use the information to write a Dockerfile that replicates the container's setup.

Keep in mind that creating a Dockerfile from a container is a manual process that can be somewhat complicated, so it's recommended to still maintain your Dockerfiles alongside your application from the start.