Individual skill
docker
Docker containerization for .NET 10 applications. Covers multi-stage builds, .NET container images, non-root user configuration, health checks, and .dockerignore. Load this skill when containerizing an application with a Dockerfile, optimizing image size, setting up Docker Compose for local development, or when the user mentions "Docker", "Dockerfile", "container", "docker-compose", "image", "multi-stage", "non-root", ".dockerignore", or "container health check". For Dockerfile-less SDK publishing (`dotnet publish /t:PublishContainer`), load the container-publish skill instead.
skills/docker/SKILL.md
Source commit 23300897f4d1a276bc475e373ecfe886e43dd7c5
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- Last checked
- Nov 4, 2026
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- Repository last updated
- Nov 4, 2026
- License
- MIT
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- devops Derived category
- devops-containers Derived category
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# Docker
## Core Principles
1. **Multi-stage builds always** — Separate build and runtime stages. Build in the SDK image, run in the ASP.NET runtime image.
2. **Non-root by default** — .NET container images support `USER app` by default since .NET 8. Never run as root in production.
3. **Layer caching matters** — Copy `.csproj` files and restore before copying source code. This caches NuGet dependencies across builds.
4. **Health probes at the orchestrator level** — Expose a `/health/live` endpoint and let Kubernetes/Compose probe it. Chiseled and default aspnet images have no shell or curl, so in-image `HEALTHCHECK` commands have nothing to run with.
## Patterns
### Multi-Stage Dockerfile for Web API
```dockerfile