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Dockerfile
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# Accept the Go version for the image to be set as a build argument.
# Default to Go 1.14
ARG GO_VERSION=1.14
# First stage: build the executable.
FROM golang:${GO_VERSION}-alpine AS builder
ARG WHAT=cmd/operator/main.go
# Create the user and group files that will be used in the running container to
# run the process as an unprivileged user.
RUN mkdir /user && \
echo 'nobody:x:65534:65534:nobody:/:' > /user/passwd && \
echo 'nobody:x:65534:' > /user/group
ENV GOOS linux
ENV GOARCH amd64
ENV CGO_ENABLED 0
ENV WHAT=${WHAT}
ENV GO111MODULE=on
# Set the working directory outside $GOPATH to enable the support for modules.
WORKDIR /src
# Fetch dependencies first; they are less susceptible to change on every build
# and will therefore be cached for speeding up the next build
COPY ./go.mod ./go.sum ./
RUN go mod download
# Import the code from the context.
COPY ./ ./
RUN go build -o /app -trimpath "${WHAT}"
# Final stage: the running container.
FROM alpine AS final
# Import the user and group files from the first stage.
COPY --from=builder /user/group /user/passwd /etc/
# Import the Certificate-Authority certificates for enabling HTTPS.
COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
# Import the compiled executable from the first stage.
COPY --from=builder /app /app
ENV TZ="Asia/Shanghai"
RUN apk --update add tzdata && cp /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
# Perform any further action as an unprivileged user.
USER nobody:nobody
# Run the compiled binary.
ENTRYPOINT ["/app"]