Date: 2024-02-21
Accepted
We have a GitLab CI/CD pipeline that builds and tests our application in a Docker container. We want to speed up the build process by caching the Docker layers.
This recipe optimizes Docker builds for multi-platform environments, ensuring efficient use of caching and external dependencies.
graph TD;
APP_ENV("$APP_ENV decision point") -->|ci| CI_Builder["CI Builder as Cache"]
APP_ENV -->|development| Development_Builder["Development Builder as Cache"]
CI_Builder --> Production["Production Image"]
Development_Builder --> Production
# Base stage: Install dependencies only when needed
FROM --platform=$BUILDPLATFORM node:21.6-alpine AS development-builder
# Development build stage: Copy over only necessary files for production
FROM --platform=$BUILDPLATFORM development-builder AS cache
COPY --from=development-builder /app/packages/next/out /app/out
# Cache stage: Prepare artifacts for production without additional dependencies.
FROM --platform=$BUILDPLATFORM alpine:3.19 AS ci-builder
FROM --platform=$BUILDPLATFORM ${APP_ENV}-builder AS cache
COPY ./boundaries/ui-monorepo/packages/next/out /app/out
# Production image: use cache from development or CI layers
FROM --platform=$TARGETPLATFORM ghcr.io/nginxinc/nginx-unprivileged:1.25-alpine
COPY --from=cache /app/out ./next