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Tweak docs re in-docker usage
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rnorth committed Jan 21, 2017
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# Docker in Docker

Since TestContainers version 1.1.8, you can run your tests inside a container.
It's very useful for different CI scenarios like running everything in containers on Jenkins.
> Since 1.1.8
Testcontainers itself can be used from inside a container.
This is very useful for different CI scenarios like running everything in containers on Jenkins, or Docker-based CI tools such as Drone.

TestContainers will automatically detect if it's inside a container and instead of "localhost" will use the default gateway's IP.

However, an additional configuration is required if you use [volume mapping](options.md#volume-mapping).
However, additional configuration is required if you use [volume mapping](options.md#volume-mapping). The following points need to be considered:

* The docker socket must be available via a volume mount
* The 'local' source code directory must be volume mounted *at the same path* inside the container that Testcontainers runs in, so that Testcontainers is able to set up the correct volume mounts for the containers it spawns.

## Docker-only
## Docker-only example
If you run the tests with just `docker run ...` then make sure you add `-v $PWD:$PWD -w $PWD -v /var/run/docker.sock:/var/run/docker.sock` to the command, so it will look like this:
```bash
$ tree .
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* `-w $PWD` will set the current directory to this volume
* `-v /var/run/docker.sock:/var/run/docker.sock` will map the Docker socket

## Docker Compose
## Docker Compose example
The same can be achived with Docker Compose:
```yaml
tests:
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