After pulling a Docker from the repository, how to change the images files?

Question

I installed a docker image from the registry by doing.

docker pull paintedfox/nginx-php5

Now I wish to make some changes to this nginx's config files to add some domains. I believe the config files are somehow help inside the dockers image, but where is the image? How can I change these config files?

Answer 1

You can run a shell in the image, with:

docker run -t -i --entrypoint bash paintedfox/nginx-php5

Then change the configuration files as you like. Note the container ID (it appears in the prompt, e.g. root@9ffa2bafe2bb:/#), then commit it to a new image:

docker commit 9ffa2bafe2bb my-new-nginx

You can then run the new image (my-new-nginx).