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lighthouse/book/src/docker.md
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Markdown

# Docker Guide
There are two ways to obtain a Lighthouse Docker image:
1. [Docker Hub](#docker-hub), or
2. By [building a Docker image from source](#building-the-docker-image).
Once you have obtained the docker image via one of these methods, proceed to [Using the Docker
image](#using-the-docker-image).
## Docker Hub
Lighthouse maintains the [sigp/lighthouse][docker_hub] Docker Hub repository which provides an easy
way to run Lighthouse without building the image yourself.
Obtain the latest image with:
```bash
docker pull sigp/lighthouse
```
Download and test the image with:
```bash
docker run sigp/lighthouse lighthouse --version
```
If you can see the latest [Lighthouse release](https://github.com/sigp/lighthouse/releases) version
(see example below), then you've successfully installed Lighthouse via Docker.
### Example Version Output
```text
Lighthouse vx.x.xx-xxxxxxxxx
BLS Library: xxxx-xxxxxxx
```
### Available Docker Images
There are several images available on Docker Hub.
Most users should use the `latest` tag, which corresponds to the latest stable release of
Lighthouse with optimizations enabled.
To install a specific tag (in this case `latest`), add the tag name to your `docker` commands:
```bash
docker pull sigp/lighthouse:latest
```
Image tags follow this format:
```text
${version}${arch}${stability}
```
The `version` is:
* `vX.Y.Z` for a tagged Lighthouse release, e.g. `v2.1.1`
* `latest` for the `stable` branch (latest release) or `unstable` branch
The `arch` is:
* `-amd64` for x86_64, e.g. Intel, AMD
* `-arm64` for aarch64, e.g. Raspberry Pi 4
* empty for a multi-arch image (works on either `amd64` or `arm64` platforms)
The `stability` is:
* `-unstable` for the `unstable` branch
* empty for a tagged release or the `stable` branch
Examples:
* `latest-unstable`: most recent `unstable` build
* `latest-amd64`: most recent Lighthouse release for older x86_64 CPUs
* `latest-amd64-unstable`: most recent `unstable` build for older x86_64 CPUs
## Building the Docker Image
To build the image from source, navigate to
the root of the repository and run:
```bash
docker build . -t lighthouse:local
```
The build will likely take several minutes. Once it's built, test it with:
```bash
docker run lighthouse:local lighthouse --help
```
## Using the Docker image
You can run a Docker beacon node with the following command:
```bash
docker run -p 9000:9000/tcp -p 9000:9000/udp -p 9001:9001/udp -p 127.0.0.1:5052:5052 -v $HOME/.lighthouse:/root/.lighthouse sigp/lighthouse lighthouse --network mainnet beacon --http --http-address 0.0.0.0
```
> To join the Holesky testnet, use `--network holesky` instead.
> The `-v` (Volumes) and `-p` (Ports) and values are described below.
### Volumes
Lighthouse uses the `/root/.lighthouse` directory inside the Docker image to
store the configuration, database and validator keys. Users will generally want
to create a bind-mount volume to ensure this directory persists between `docker
run` commands.
The following example runs a beacon node with the data directory
mapped to the users home directory:
```bash
docker run -v $HOME/.lighthouse:/root/.lighthouse sigp/lighthouse lighthouse beacon
```
### Ports
In order to be a good peer and serve other peers you should expose port `9000` for both TCP and UDP, and port `9001` for UDP.
Use the `-p` flag to do this:
```bash
docker run -p 9000:9000/tcp -p 9000:9000/udp -p 9001:9001/udp sigp/lighthouse lighthouse beacon
```
If you use the `--http` flag you may also want to expose the HTTP port with `-p
127.0.0.1:5052:5052`.
```bash
docker run -p 9000:9000/tcp -p 9000:9000/udp -p 9001:9001/udp -p 127.0.0.1:5052:5052 sigp/lighthouse lighthouse beacon --http --http-address 0.0.0.0
```
[docker_hub]: https://hub.docker.com/repository/docker/sigp/lighthouse/