redoc/docs/deployment/docker.md

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---
title: Using the Redoc Docker image
redirectFrom:
- /docs/quickstart/docker/
---
# Using the Redoc Docker image
Redoc is available as a pre-built Docker image in [Docker Hub](https://hub.docker.com/r/redocly/redoc/).
If you have [Docker](https://docs.docker.com/get-docker/) installed, pull the image with the following command:
```docker
docker pull redocly/redoc
```
Then run the image with the following command:
```docker
docker run -p 8080:80 redocly/redoc
```
The preview starts on port 8080, based on the port used in the command,
and can be accessed at `http://localhost:8080`.
To exit the preview, use `control+C`.
By default Redoc starts with a demo Swagger Petstore OpenAPI definition located at
http://petstore.swagger.io/v2/swagger.json. You can update this URL using
the environment variable `SPEC_URL`.
For example:
```bash
docker run -p 8080:80 -e SPEC_URL=https://api.example.com/openapi.json redocly/redoc
```
## Using a Dockerfile
You can also create a Dockerfile with some predefined environment variables. Check out
a sample [Dockerfile](https://github.com/Redocly/redoc/blob/master/config/docker/Dockerfile)
in our code repo.