Learn DOCKERFILE with Real Code Examples

Minimize number of layers to reduce image size

Use official base images for efficiency and security

Leverage multi-stage builds to separate build and runtime

Combine RUN commands where appropriate

Clean temporary files during build to optimize size

Use minimal base images (Alpine, slim variants)

Scan images for vulnerabilities

Avoid running containers as root

Secure secrets with environment variables or secrets management

Keep Docker and base images updated

Container logs

Resource usage monitoring (CPU, memory, disk)

Image scanning for vulnerabilities

Container healthchecks

Automated alerts and dashboards for running containers

Follow Dockerfile best practices

Minimize layers and reduce image size

Document each instruction

Use .dockerignore to exclude unnecessary files

Keep secrets out of images