Dockerfile

# MIT License
#
# Copyright (c) 2023 Matheus Pimenta
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in all
# copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

FROM golang:1.22.2-alpine3.19 AS builder

WORKDIR /app

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

COPY ./cmd/ ./cmd/
COPY ./internal/ ./internal/

# CGO_ENABLED=0 to build a statically-linked binary
# -ldflags '-w -s' to strip debugging information for smaller size
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-w -s" -o gke-metadata-server \
    github.com/matheuscscp/gke-metadata-server/cmd

FROM alpine:3.19.0

RUN apk add --no-cache iptables

COPY --from=builder /app/gke-metadata-server .

ENTRYPOINT ["./gke-metadata-server"]