Dockerfile

# Generated from kubebuilder template:
# https://github.com/kubernetes-sigs/kubebuilder/blob/v4.11.1/pkg/plugins/golang/v4/scaffolds/internal/templates/dockerfile.go

# Build the manager binary
FROM --platform=${BUILDPLATFORM} golang:1.26.4 AS builder
ARG TARGETOS
ARG TARGETARCH

WORKDIR /workspace
# Copy the Go Modules manifests
COPY go.mod go.mod
COPY go.sum go.sum
# cache deps before building and copying source so that we don't need to re-download as much
# and so that source changes don't invalidate our downloaded layer
RUN go mod download

# Copy the Go source (relies on .dockerignore to filter)
COPY . .

# Build
# the GOARCH has no default value to allow the binary to be built according to the host where the command
# was called. For example, if we call make docker-build in a local env which has the Apple Silicon M1 SO
# the docker BUILDPLATFORM arg will be linux/arm64 when for Apple x86 it will be linux/amd64. Therefore,
# by leaving it empty we can ensure that the container and binary shipped on it will have the same platform.
RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -a -o manager ./cmd

# Build the manager binary with debug symbols
FROM golang:1.26.4 AS debug-builder
ARG TARGETOS
ARG TARGETARCH

WORKDIR /workspace
COPY go.mod go.mod
COPY go.sum go.sum
RUN go mod download

COPY . .

RUN CGO_ENABLED=0 GOOS=${TARGETOS:-linux} GOARCH=${TARGETARCH} go build -gcflags="all=-N -l" -o manager ./cmd

# Debug image with Delve
FROM golang:1.26.4 AS debug
RUN go install github.com/go-delve/delve/cmd/dlv@v1.26.3
WORKDIR /
COPY --from=debug-builder /workspace/manager .
USER 65532:65532

ENTRYPOINT ["dlv", "exec", "/manager", "--headless", "--listen=:40000", "--api-version=2", "--accept-multiclient", "--"]

# Use distroless as minimal base image to package the manager binary
# Refer to https://github.com/GoogleContainerTools/distroless for more details
FROM gcr.io/distroless/static:nonroot AS production
WORKDIR /
COPY --from=builder /workspace/manager .
USER 65532:65532

ENTRYPOINT ["/manager"]