Replace alpine:3.15 with distroless static#912
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Pull request overview
This PR hardens the container images for the DigitalOcean cloud-controller-manager and its admission server by switching from an Alpine-based runtime image to a distroless static (nonroot) runtime image.
Changes:
- Replace
alpine:3.15withgcr.io/distroless/static-debian12:nonrootfor both images. - Remove package installation (
apk add ca-certificates) and simplify the image contents to just the compiled binaries. - Use
ENTRYPOINTto run the binaries by default.
Reviewed changes
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| File | Description |
|---|---|
| cloud-controller-manager/cmd/digitalocean-cloud-controller-manager/Dockerfile | Switch runtime base image to distroless static nonroot; copy binary and set entrypoint. |
| cloud-controller-manager/cmd/digitalocean-cloud-controller-manager-admission-server/Dockerfile | Same distroless static nonroot migration for the admission server image. |
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m3co-code
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May 5, 2026
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LGTM but I think we should verify this works as expected before merging.
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This PR Replaces
alpine:3.15withgcr.io/distroless/static-debian12:nonrootfor both images.Also removes package installation (
apk add ca-certificates) and simplify the image contents to just the compiled binaries.