Dockerfile

# Copyright 2017 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.

# builder image
ARG ARCH
ARG GOLANG_IMAGE=ghcr.io/verrazzano/golang:v1.20.12

FROM ${GOLANG_IMAGE} as builder
ARG ARCH

RUN dnf install -y make which &&\
    dnf clean all &&\
    rm -rf /var/cache/yum/* 

# Compile to /usr/bin
ENV GOBIN=/usr/bin

# Set go path
ENV GOPATH=/go

# Turn GO111Module on to enable go get
ENV GO111MODULE=on

WORKDIR /sigs.k8s.io/external-dns

COPY go.mod .
COPY go.sum .

# Install Controller-gen dependency and move to bin location
RUN go install sigs.k8s.io/controller-tools/cmd/controller-gen@v0.5.0

COPY . .
RUN go mod download && make test build.$ARCH

# final image
FROM ghcr.io/verrazzano/ol8-static:v0.0.1-20231102152128-e7afc807

COPY --from=builder /etc/pki/tls/certs/ca-bundle.crt /etc/ssl/certs/ca-certificates.crt
COPY --from=builder /sigs.k8s.io/external-dns/build/external-dns /bin/external-dns

# COPY LICENSE and other files to the image
COPY LICENSE README.md THIRD_PARTY_LICENSES.txt SECURITY.md /licenses/

# Run as UID for nobody since k8s pod securityContext runAsNonRoot can't resolve the user ID:
# https://github.com/kubernetes/kubernetes/issues/40958
USER 65534

ENTRYPOINT ["/bin/external-dns"]