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Refactor: overhaul Dockerfile with multi-stage build, non-root user, and .dockerignore #135

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Merged
dmabry merged 1 commit into from
May 15, 2026
Merged

Refactor: overhaul Dockerfile with multi-stage build, non-root user, and .dockerignore #135

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33 changes: 33 additions & 0 deletions .dockerignore
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# Git
.git
.github

# Documentation
*.md
docs/
LICENSE
CONTRIBUTING.md
CODE_OF_CONDUCT.md

# IDE / editor
.idea/
.vscode/
*.swp
*~

# OpenHands microagents
.openhands/

# Build artifacts
flowgre
flowgre_*
coverage.out

# Test-only / dev files
examples/
.nfpm/
scripts/

# Node / TUI (not needed for Go binary)
node_modules/
ui-tui/
55 changes: 32 additions & 23 deletions Dockerfile
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# Use of this source code is governed by Apache License 2.0
# that can be found in the LICENSE file.

FROM golang:alpine AS build-stage
# ---------------------------------------------------------------------------
# Build stage — compile a fully static binary (CGO_ENABLED=0)
# ---------------------------------------------------------------------------
FROM golang:1.26-alpine AS build-stage

COPY . /opt/src
WORKDIR /opt/src
WORKDIR /src

ENV GO111MODULE on
# Cache dependency resolution layer separately from source code.
COPY go.mod go.sum ./
RUN go mod download

# prepare for build
RUN apk add --no-cache build-base git
# build
RUN git submodule -q init
RUN git submodule -q update
# RUN go build -mod vendor
RUN go build
# Copy source and build a static binary.
# TARGETARCH is auto-injected by BuildKit (arm64 on this host, amd64 on CI).
COPY . .
RUN CGO_ENABLED=0 GOOS=linux GOARCH=${TARGETARCH} go build -ldflags "-s -w" -o /flowgre .

# deploy
FROM alpine:latest
# ---------------------------------------------------------------------------
# Runtime stage — minimal Alpine image, non-root user
# ---------------------------------------------------------------------------
FROM alpine:3.21

# add some alpine deps
RUN apk add --no-cache tzdata
RUN apk add --no-cache tzdata && \
addgroup -S flowgre && \
adduser -S -g flowgre flowgre

# copy stuff in
WORKDIR /opt/app
COPY --from=build-stage /flowgre ./flowgre

COPY --from=build-stage /opt/src/flowgre ./flowgre
USER flowgre

# override default entrypoint on final container
ENTRYPOINT [ "/opt/app/flowgre" ]
LABEL org.opencontainers.image.source=https://github.com/dmabry/flowgre
LABEL org.opencontainers.image.description="Flowgre container image"
LABEL org.opencontainers.image.licenses="Apache License 2.0"
LABEL org.opencontainers.image.version="0.4.10"
ENTRYPOINT ["/opt/app/flowgre"]

# OCI labels — version is injected at build time via --build-arg
ARG VERSION=dev
LABEL org.opencontainers.image.source="https://github.com/dmabry/flowgre" \
org.opencontainers.image.description="NetFlow v9 / IPFIX packet generator for collector stress testing" \
org.opencontainers.image.licenses="Apache-2.0" \
org.opencontainers.image.version="${VERSION}"

# No HEALTHCHECK — flowgre is a CLI tool, not a daemon.
# The /health endpoint only exists in barrage mode with -web flag.
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