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# Running the engine in a Docker container
For local development and testing, you can run the engine in a Docker
container.
The steps are:
1. Bundle the engine and its dependencies.
1. Build a Docker image.
1. Create a Docker container.
## About Docker
To get a high-level overview of Docker, please read [Understand the
architecture](https://docs.docker.com/introduction/understanding-docker/).
Optional reading includes reference guides for
[`docker run`](https://docs.docker.com/reference/run/) and
[Dockerfile](https://docs.docker.com/reference/builder/).
### Installation
For Googlers running Goobuntu wanting to install Docker, see
[go/installdocker](https://goto.google.com/installdocker). For other
contributors using Ubuntu, see [official Docker
installation instructions](https://docs.docker.com/installation/ubuntulinux/).
## Bundle Engine
The `blimp/engine:blimp_engine_bundle` build target will bundle the engine and
its dependencies into a tarfile, which can be used to build a Docker image.
This target is always built as part of the top-level `blimp/blimp` meta-target.
### Update Engine Dependencies
`blimp/engine/engine-manifest.txt` is a list of the engine's runtime
dependencies. From time to time, this list may need to be updated. Use
`blimp/tools/generate-engine-manifest.py` to (re)generate the manifest:
```bash
./blimp/tools/generate-engine-manifest.py \
--build-dir out-linux/Debug \
--target //blimp/engine:blimp_engine \
--output blimp/engine/engine-manifest.txt
```
Be sure to review the generated manifest and remove any false runtime
dependencies.
## Build Docker Image
Using the tarfile you can create a Docker image:
```bash
docker build -t blimp_engine - < ./out-linux/Debug/blimp_engine_bundle.tar
```
## Create Docker Container
From the Docker image you can create a Docker container (i.e. run the engine):
```bash
docker run blimp_engine
```
You can also pass additional flags:
```bash
docker run blimp_engine --with-my-flags
```
See the [blimp engine `Dockerfile`](../engine/Dockerfile) to find out what flags
are passed by default.
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