Containers
In-depth guides and analysis on containers from the Safeguard engineering team.
100 articles
How to Write a Secure Node.js Dockerfile
A hardened Node.js Dockerfile starts with a pinned base image, a non-root user, and a multi-stage build. Here is how to write one that survives a real security review.
Docker Security Issues and How to Fix the Most Common Ones
Most Docker security issues trace back to a handful of predictable mistakes: bloated base images, root containers, and secrets baked into layers. Here is how to find and fix them.
cAdvisor: Container Resource Monitoring, Explained
cAdvisor gives you per-container CPU, memory, network, and filesystem metrics out of the box — here's what it actually measures, how it fits with Prometheus and Kubernetes, and where its limits show up.
Docker and Container Security Best Practices: A Combined Checklist
A single, practical checklist covering dockers and containers together — image build, runtime config, and CI gates — instead of treating Docker security and container security as separate problems.
Node.js in Docker: Choosing and Securing Your Base Image
The Docker Node base image you pick decides your CVE count before you write a line of code. Here is how to choose between Debian, slim, and Alpine — and harden whichever you pick.
Node.js Docker Containers: Build Small, Run Safe
A Node.js Docker container that is both small and secure: multi-stage builds, npm ci with a lockfile, non-root users, and why you should not run as PID 1.
"New Tag Scanned": What Container Registries Mean By It
A plain explanation of what the "new tag scanned" event actually means in registries like GHCR, ECR, and Docker Hub, and what to do when it flags a vulnerability.
Docker Image File Extensions: What a .tar Image Actually Contains
Docker images do not have a special file extension. When you save one it is a .tar archive. Here is what is inside, and how the OCI layout is structured.
Container Image Vulnerability Scanning in CI
How to wire container image vulnerability scanning into your CI pipeline so builds fail on real risk instead of shipping unscanned images to production.
Rebuilding Docker Images: Cache, Patching, and Reproducibility
A plain docker build reuses cached layers and silently skips your security patches. Here is how the cache actually works, how to force a real rebuild, and how to keep rebuilds reproducible.
What Is Docker Used For? A Practical Answer
What Docker is actually used for in real teams: packaging apps, consistent environments, and shipping to production, plus the security angles that come with containers.
What Gartner's Container Security Coverage Gets Right (and Skips)
Gartner's container security research correctly frames the shift toward CNAPP consolidation, but its category boundaries often lag how teams actually operate scanning day to day.
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