Dockerization

Dockerize Ruby on Rails: Fast Deploys, Reproducible Builds

Rails apps carry heavy dependencies — native gems like nokogiri, asset compilation, and database drivers all need specific system libraries. We build multi-stage Dockerfiles that compile native extensions in a build stage, precompile assets, and produce slim runtime images with only what Rails needs to serve requests.

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Why Dockerize Ruby on Rails

Rails deployments are brittle without containerization. Bundler version mismatches, missing libxml2 headers for Nokogiri, and different ImageMagick versions between environments cause silent failures that are painful to debug.

Docker freezes the entire runtime stack — Ruby version, system libraries, gems, and configuration — into a single artifact. Every deployment is identical to what you tested, and rollbacks are instant because you just swap image tags.

Our Docker Implementation for Ruby on Rails

Multi-stage Dockerfile separating build and runtime:

Build stage: FROM ruby:3.3-slim AS builder — installs build-essential, libpq-dev, and other native extension dependencies. Runs bundle config set --local deployment true then bundle install. For apps with a JS frontend, runs rails assets:precompile with Node.js installed in this stage only.
Runtime stage: FROM ruby:3.3-slim — installs only runtime libraries (libpq5, libvips for Active Storage). Copies vendor/bundle and precompiled assets from the builder. Sets RAILS_ENV=production, RAILS_SERVE_STATIC_FILES=1, and runs as a non-root user.

Compose config includes Puma with appropriate worker/thread counts, a health check hitting /up (Rails 7.1+ built-in health check), and depends_on with the database service condition.

What You Get

Multi-stage Dockerfile with precompiled assets — 250-400 MB final image
docker-compose.yml with Postgres, Redis, and Sidekiq services
Entrypoint script that runs rails db:prepare on first boot
Health check on Rails 7.1+ /up endpoint
.dockerignore excluding tmp/, log/, .git, node_modules
CI pipeline with bundle cache layer optimization

Why Anubiz Engineering

100% async — no calls, no meetings

Delivered in days, not weeks

Full documentation included

Production-grade from day one

Security-first approach

Post-delivery support included

Ready to get started?

Skip the research. Tell us what you need, and we'll scope it, implement it, and hand it back — fully documented and production-ready.

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