mirror of https://github.com/docker/docs.git
46 lines
1.5 KiB
Markdown
46 lines
1.5 KiB
Markdown
---
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description: Dev Environments
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keywords: Dev Environments, share, collaborate, local, Dockerfile, specify, base image
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title: Specify a Dockerfile or base image
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---
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## Specify a Dockerfile
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Use a JSON file to specify a Dockerfile which in turn defines your Dev Environment. You must include this as part of the `.docker` folder and then add it as a `config.json` file. For example:
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```jsx
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{
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"dockerfile": "Dockerfile.devenv"
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}
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```
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Next, define the dependencies you want to include in your `Dockerfile.devenv`.
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While some images or Dockerfiles include a non-root user, many base images and Dockerfiles do not. Fortunately, you can add a non-root user named `vscode`. If you include Docker tooling, for example the Docker CLI or `docker compose`, in the `Dockerfile.devenv`, you need the `vscode` user to be included in the `docker` group.
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```dockerfile
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# syntax=docker/dockerfile:1
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FROM <your base image>
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RUN useradd -s /bin/bash -m vscode \
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&& groupadd docker \
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&& usermod -aG docker vscode
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USER vscode
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```
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## Specify a base image
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If you already have an image built, you can specify it as a base image to define your Dev Environment. You must include this as part of the `.docker` folder and then add it as a `config.json` file. For example, to use the Jekyll base image, add:
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```jsx
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{
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"image": "jekyll/jekyll"
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}
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```
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> **Note**
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>
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> This configuration is to unblock users for the Beta release only. We may move this configuration for single and multi-container applications to a Compose-based implementation in future releases.
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