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93d826e | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 | # Multi-stage build example
FROM golang:1.21-alpine AS builder
# Build arguments
ARG VERSION=1.0.0
ARG BUILD_DATE
# Set working directory
WORKDIR /app
# Copy only necessary files for dependency resolution
COPY go.mod go.sum ./
# Download dependencies
RUN go mod download
# Copy source code
COPY . .
# Build the application
RUN CGO_ENABLED=0 GOOS=linux go build -ldflags="-X main.Version=${VERSION} -X main.BuildDate=${BUILD_DATE}" -o /app/server
# Create final lightweight image
FROM alpine:latest
# Labels for metadata
LABEL maintainer="example@example.com" \
version="${VERSION}" \
description="Example Dockerfile with various syntax elements"
# Environment variables
ENV APP_ENV=production \
PORT=8080
# Create non-root user
RUN addgroup -S appgroup && adduser -S appuser -G appgroup
# Install runtime dependencies
RUN apk add --no-cache \
ca-certificates \
tzdata
# Set working directory
WORKDIR /app
# Copy binary from builder stage
COPY --from=builder /app/server .
# Copy configuration files
COPY config/production.yaml /etc/app/config.yaml
# Create volume mount points
VOLUME ["/data", "/logs"]
# Expose ports
EXPOSE 8080 8443
# Switch to non-root user
USER appuser
# Health check
HEALTHCHECK --interval=30s --timeout=3s \
CMD wget --quiet --tries=1 --spider http://localhost:${PORT}/health || exit 1
# Set entry point and default command
ENTRYPOINT ["/app/server"]
CMD ["--config", "/etc/app/config.yaml"]
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