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coder/docs/templates/devcontainers.md
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I have read the CLA Document and I hereby sign the CLA

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Co-authored-by: Muhammad Atif Ali <matifali@live.com>
Co-authored-by: Ben Potter <me@bpmct.net>
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Co-authored-by: Ben <me@bpmct.net>
Co-authored-by: Marc Paquette <22124737+marcpaq@users.noreply.github.com>
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# Devcontainers (alpha)
[Devcontainers](https://containers.dev) are an open source specification for
defining development environments.
[envbuilder](https://github.com/coder/envbuilder) is an open source project by
Coder that runs devcontainers via Coder templates and your underlying
infrastructure. It can run on Docker or Kubernetes.
There are several benefits to adding a devcontainer-compatible template to
Coder:
- Drop-in migration from Codespaces (or any existing repositories that use
devcontainers)
- Easier to start projects from Coder. Just create a new workspace then pick a
starter devcontainer.
- Developer teams can "bring their own image." No need for platform teams to
manage complex images, registries, and CI pipelines.
## How it works
A Coder admin adds a devcontainer-compatible template to Coder (envbuilder).
Then developers enter their repository URL as a [parameter](./parameters.md)
when they create their workspace.
[envbuilder](https://github.com/coder/envbuilder) clones the repo and builds a
container from the `devcontainer.json` specified in the repo.
Developers can edit the `devcontainer.json` in their workspace to rebuild to
iterate on their development environments.
## Example templates
- [Docker](https://github.com/coder/coder/tree/main/examples/templates/devcontainer-docker)
- [Kubernetes](https://github.com/coder/coder/tree/main/examples/templates/devcontainer-kubernetes)
![Devcontainer parameter screen](../images/templates/devcontainers.png)
Your template can prompt the user for a repo URL with
[Parameters](./parameters.md).
## Authentication
You may need to authenticate to your container registry, such as Artifactory, or
git provider such as GitLab, to use envbuilder. See the
[envbuilder documentation](https://github.com/coder/envbuilder/) for more
information.
## Caching
To improve build times, devcontainers can be cached. Refer to the
[envbuilder documentation](https://github.com/coder/envbuilder/) for more
information.
## Other features & known issues
Envbuilder is still under active development. Refer to the
[envbuilder GitHub repo](https://github.com/coder/envbuilder/) for more
information and to submit feature requests.