Porovnání Dockerfile a docker-compose.yml

Container configurations určují jak vaše aplikace běží v produkci. Změny v Dockerfile nebo docker-compose.yml mohou ovlivnit security performance a stability deployments.

Dockerfile vs docker-compose.yml

Dockerfile definuje jak se builduje single container image. docker-compose.yml orchestruje multiple containers services networking volumes. Dockerfile je build-time configuration. docker-compose.yml je runtime orchestration.

Critical Dockerfile changes

Base image změny from alpine to ubuntu security implications. Package installations nové dependencies version bumps. Environment variables configuration secrets. COPY vs ADD commands file inclusion behavior. USER directive security container runs as non-root. EXPOSE ports network accessibility. ENTRYPOINT vs CMD startup command behavior.

Multi-stage build diffing

Stages v Dockerfile build intermediate images. Sledujte které stages byly přidány nebo odstraněny. Build arguments ARG variables. Copy from previous stage artifacts dependencies. Size optimization layer caching.

Docker-compose service changes

Service additions new containers v stack. Port mappings host to container port bindings. Volume mounts data persistence configurations. Networks inter-service communication. Environment variables per-service configuration. Dependencies depends_on startup ordering. Health checks container readiness probes.

Version compatibility

Docker a docker-compose versions compatibility. Compose file version 2 vs 3 syntax differences. Deprecated features migrace na nové syntax. Platform-specific configurations Linux vs Windows containers.

Security implications

Privileged mode security risks. Secrets management environment vs Docker secrets. Network exposure published ports firewall. Volume permissions file access rights. Image scanning vulnerabilities v base images.

Performance optimization

Resource limits CPU memory constraints. Build cache optimization layer ordering. Multi-stage builds reducing final image size. Health check intervals startup time vs reliability. Network mode host vs bridge performance.

Development vs production configs

Override files docker-compose.override.yml pro dev. Environment-specific settings development staging production. Debug tools included v dev excluded v prod. Volume mounts code mounting v dev immutable v prod.

Systematic Docker config management ensures consistent reliable a secure container deployments across all environments.

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