Docker
The containerization standard: reproducible apps, reliable deployments, clean isolation.
Docker has transformed application deployment since 2014: instead of manually installing dependencies on each server, you encapsulate the application and its environment in an immutable image. This image runs identically on the developer's laptop, the staging server and production. For an SMB, Docker is no longer optional: it's the foundation of reproducible infrastructure, the basis of all modern DevOps.
My take on Docker: it's the foundational brick of any modern infrastructure, and it's no longer optional.
The real value isn't in Docker itself, it's in what it makes possible for your business: reproducible deployments, clean CI/CD, instant rollback, horizontal scaling without reinstalling. I systematically use it as soon as there's more than one server or more than one environment (dev, staging, prod).
For a very simple mono-server, it's almost always useful too, if only to guarantee you reproducibility in case of failure. The real question today isn't 'Docker or not', it's 'Docker alone or Docker with orchestrator' depending on the size of your infrastructure.
- →Multiple environments to keep consistent (dev, staging, prod)
- →Multiple services to orchestrate on the same server (app + DB + cache)
- →Automated CI/CD deployments: Docker is the de facto standard
- →Multi-developer team: accelerated onboarding (single docker-compose up)
- →Process isolation to reduce attack surface on the security side
- ×Small static mono-server site without business logic: useless overhead
- ×Team without Linux / containers culture: the initial investment can be heavy
- ×Historical application very tied to the host system: rewriting is sometimes more economical than containerization
- →PodmanDocker-compatible alternative, daemonless, often better in secure enterprise environments
- →docker-compose aloneFor mono-server deployments: no need for full orchestrator
- →Kubernetes (K8s)From 5+ servers or auto-scaling need, otherwise overkill
- →Classic bare metalApps very tied to the system or license constraints, becoming rare
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Single responsibility per image: no cathedral-image with 10 services
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Official upstream images whenever possible: security and maintenance
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Multi-stage builds to minimize size (often <100 MB for a Node or PHP app)
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docker-compose for local development and simple mono-server deployments
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Healthchecks and centralized logs (Loki, journald): a container without observability is blind
Docker or directly on the server?
Docker in the vast majority of cases, including on a mono-server. The overhead is low (a few % RAM/CPU), the benefits are huge (reproducible deployment, fast rollback, isolation). The only exception: applications very tied to the Linux kernel or license constraints prohibiting containerization. For modern SMBs, it's become the default.Docker alone or Kubernetes?
Docker alone (or with docker-compose) suffices for most SMBs: one or two servers, simple applications. Kubernetes becomes relevant from 5+ servers, multiple teams, auto-scaling needs. Classic trap: choosing Kubernetes by trend when a VPS with docker-compose would do for 3-5 years. Kubernetes complexity is only justified by real scale.How much does Docker setup cost?
For an existing application (PHP, Node, Python), expect 1-3 days to containerize it properly and integrate it into CI/CD. For a new Docker-first app, it's included in the initial cost (often less than a day). The investment pays back from the first real incident-free deployment, often a few weeks.What about container security?
Three best practices: use minimal official base images (Alpine or distroless), run the app as non-root user, scan regularly with Trivy or Grype. Most Docker vulnerabilities come from outdated images or bad practices (exec as root, unnecessarily exposed ports). Properly configured, Docker improves security rather than degrading it.What to choose between Docker, Podman, and containerd?
Docker remains the standard for developers (excellent DX, mature tooling). Podman is a compatible open source alternative (identical commands), sometimes preferred in enterprise environments for its native rootless features. Containerd is the underlying runtime, used directly by Kubernetes. For an SMB, Docker is the right default without debate.
A project involving Docker?
Describe your context: I'll suggest the right level of investment.
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