dagger/docs/core-concepts/1205-container-images.md

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Building container images

You can use Dagger to build container images. Here's a simple example of a Dockerfile build:

Building with CUE

Dockerfile files are easy to start, but you can also build images entirely in CUE. The following example produces the same image as above:

Automation

Building images in CUE gives you greater flexibility. For example, you can automate building multiple versions of an image, and deploy, all in Dagger:

Now you can deploy all versions:

dagger do versions

Or just build a specific version, without pushing:

dagger do versions 8.0 build

Multi-stage build

Another common pattern is multi-stage builds. This allows you to have heavier build images during the build process, and copy the built artifacts into a cleaner and lighter image to run in production.