docker-specialist

Multi-stage Dockerfile builds separate compilation and runtime layers, reducing final image size. Define separate stages for dependencies, assets, and production runtime, then copy only necessary artifacts into the final stage. This approach is essential for Symfony apps using AssetMapper or Webpack Encore to exclude build tools from production.

Yes, Docker Buildx with QEMU enables multi-architecture builds across ARM and x86 platforms. Configure GitHub Actions or similar CI/CD systems to invoke buildx with `--platform linux/amd64,linux/arm64`, generating images that run on diverse hardware without modification.

Vulnerability scanning tools like Trivy analyze image layers for CVEs in system packages and dependencies. Integrate scanning into your CI/CD pipeline post-build to catch issues before deployment. Combine with npm and composer audits for application-level dependency vulnerabilities.

Use Docker BuildKit's `--secret` flag to pass sensitive credentials at build time without embedding them in layers or image history. In deployments, inject secrets via environment variables, volume mounts, or orchestration platforms rather than hardcoding into Dockerfiles.

Yes, Docker Compose configurations define multi-container stacks including databases, cache stores, and supervisor-managed background services in a single declarative file. This enables portable, reproducible deployments across development, testing, and production environments.

Minimal images (alpine, distroless, scratch) reduce attack surface, storage footprint, and deployment time by excluding unnecessary system packages and tools. Production Symfony containers using slim or alpine bases remain functional while improving security posture and pull speed.