Tag: containers

Profiles let you conditionally start services in Compose. Perfect for dev vs prod service splits without multiple files.

docker system prune is useful but risky. Learn what each cleanup command does and how to check disk usage safely.

ENV bakes secrets into layers visible in docker history. Use BuildKit --secret, runtime vars, or .env files.

latest doesn't mean newest. Learn why pinning versions and digests matter for reproducible deployments.

Build ARM64 and AMD64 images from one machine using Docker buildx. Setup, syntax, pushing multi-arch manifests, and when you actually need it.

Network aliases give containers multiple DNS names. Perfect for blue-green deploys and service discovery patterns.

Master Docker HEALTHCHECK syntax. Learn what checks work, how to tune interval/timeout/retries, and integrate with orchestration.

Running as root in containers is a security foot-gun. Learn the USER instruction and numeric UID/GID pattern.

Docker labels are free metadata for filtering, routing, and documentation. Learn label conventions and leverage them with filters and tools.

Layer caching is your build's BFF. Learn why copying files early kills the cache and how to fix it.

Decode Docker exit codes: 0 (success), 1 (app error), 125/126/127 (Docker errors), 137 (OOM), 143 (SIGTERM). Debug restarts in minutes.

Missing .dockerignore bloats build context, slows builds, and leaks secrets. Here's the one you should copy-paste.