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Add a security section

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Will Sargent 2015-10-02 12:26:49 -07:00
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@ -14,6 +14,7 @@ NOTE: This used to be a gist that continually expanded. It's now a github proje
* [Volumes](#volumes)
* [Exposing Ports](#exposing-ports)
* [Best Practices](#best-practices)
* [Security](#security)
* [Tips](#tips)
## Why
@ -151,8 +152,6 @@ Images are just [templates for docker containers](https://docs.docker.com/introd
* [`docker history`](https://docs.docker.com/reference/commandline/history) shows history of image.
* [`docker tag`](https://docs.docker.com/reference/commandline/tag) tags an image to a name (local or registry).
Docker image ids are [sensitive information](https://medium.com/@quayio/your-docker-image-ids-are-secrets-and-its-time-you-treated-them-that-way-f55e9f14c1a4) and should not be exposed to the outside world. Treat them like passwords.
## Registry & Repository
A repository is a *hosted* collection of tagged images that together create the file system for a container.
@ -215,6 +214,14 @@ This is where general Docker best practices and war stories go:
* [Building a Development Environment With Docker](http://tersesystems.com/2013/11/20/building-a-development-environment-with-docker/)
* [Discourse in a Docker Container](http://samsaffron.com/archive/2013/11/07/discourse-in-a-docker-container)
## Security
If you are in the `docker` group, you effectively [have root access](http://reventlov.com/advisories/using-the-docker-command-to-root-the-host).
Likewise, if you expose the docker unix socket to a container, you are giving the container [root access to the host](https://www.lvh.io/posts/dont-expose-the-docker-socket-not-even-to-a-container.html).
Docker image ids are [sensitive information](https://medium.com/@quayio/your-docker-image-ids-are-secrets-and-its-time-you-treated-them-that-way-f55e9f14c1a4) and should not be exposed to the outside world. Treat them like passwords.
## Layers
The versioned filesystem in Docker is based on layers. They're like [git commits or changesets for filesystems](https://docs.docker.com/terms/layer/).