Docker-based Coder workspace templates for the homelab, organized by development stack. Every template shares the same infrastructure and differs only in the toolchain baked into its image.

Templates

Template	Stack
dev-web	Node.js, Bun, Python, Claude Code
dev-backend	Go, Node.js, Bun, Opencode, Claude Code
dev-rust	Rust, Python, Claude Code
dev-c	C, C++, Claude Code
dev-java	Java, Maven, SDKMAN!, Claude Code
dev-robots	ROS 2, Python, C++, Claude Code

Shared features

Selectable GPU support: a GPU Assignment parameter attaches GPU 0, GPU 1, or both. GPU 0 is the default because GPU 1 is shared with the Ollama and Immich stacks.
Docker-out-of-Docker: the host's /var/run/docker.sock is mounted, so workspaces can build and run containers.
Ollama integration: OLLAMA_HOST points at http://host.docker.internal:11434.
Persistent home: /home/coder is mapped to a host directory and survives restarts.
Telemetry: CPU, RAM, disk, load average, swap, and GPU utilization in the Coder UI.
IDE support: code-server and JetBrains Toolbox.
Gitea CLI: tea is preinstalled for working with git.sirblob.co from the workspace.
Patched on start: the agent runs apt-get update and apt-get upgrade each time a workspace starts.

Layout

Each template directory is self-contained and can be pushed to Coder on its own:

dev-<stack>/
  main.tf         Providers, data sources, and shared locals
  parameters.tf   Workspace parameters
  agent.tf        Coder agent, startup script, and metadata
  apps.tf         code-server and JetBrains modules
  container.tf    Docker image build and container resource
  Dockerfile      Workspace image
  README.md       Template documentation

Pushing a template

coder templates push dev-web -d ./dev-web

Prerequisites

The host needs the NVIDIA container toolkit for GPU passthrough. Coder itself runs as a container and creates workspaces through the host's Docker socket, so its service needs the socket mounted and the host docker group added:

volumes:
  - /var/run/docker.sock:/var/run/docker.sock
group_add:
  - "987"

Workspaces get the same GID through the docker_group_id template variable, which defaults to 987. Confirm the host GID with getent group docker and override the variable if it differs.

Adding tools to a template

The container's root filesystem is ephemeral and /home/coder is a mounted volume, so anything installed into the home directory at build time is shadowed at runtime. Install tools under /opt or /usr/local and add them to PATH at the end of the Dockerfile.