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Dockerfile
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# syntax=docker/dockerfile:1.1-experimental
# Copyright 2019 The Kubernetes Authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Build the manager binary
FROM golang:1.16.9 as toolchain
# Run this with docker build --build_arg $(go env GOPROXY) to override the goproxy
ARG goproxy=https://proxy.golang.org
ENV GOPROXY=$goproxy
FROM toolchain as builder
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 --mount=type=cache,target=/root/.local/share/golang \
--mount=type=cache,target=/go/pkg/mod \
go mod download
# Copy the sources
COPY ./ ./
# Build
ARG package=.
ARG ARCH
ARG LDFLAGS
RUN --mount=type=cache,target=/root/.cache/go-build \
--mount=type=cache,target=/go/pkg/mod \
--mount=type=cache,target=/root/.local/share/golang \
CGO_ENABLED=0 GOOS=linux GOARCH=${ARCH} go build -ldflags "${LDFLAGS} -extldflags '-static'" -o manager ${package}
ENTRYPOINT [ "/start.sh", "/workspace/manager" ]
# Copy the controller-manager into a thin image
FROM gcr.io/distroless/static:latest
WORKDIR /
COPY --from=builder /workspace/manager .
USER nobody
ENTRYPOINT ["/manager"]