Docker Complete Guide 2026
Start with Docker basics — images, containers, Dockerfiles — then master networking, volumes, Docker Compose, Swarm, security, and Kubernetes integration.
Docker Fundamentals
start here: no prior container knowledge needed
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What is Docker? · Containers vs VMs
containerization concepts, Docker architecture, installation
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Essential Docker Commands
docker run, ps, stop, rm, images, pull, push
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Understanding Docker Images
layers, registries, tagging, image management
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Docker Container Lifecycle
created, running, paused, stopped, deleted states
Dockerfile & Building Images
create custom images like a pro
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Dockerfile Basics
FROM, RUN, COPY, ADD, CMD, ENTRYPOINT
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Dockerfile Best Practices
multi-stage builds, layer caching, image size optimization
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Multi-Stage Builds
minimize final image size, build and runtime separation
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Image Tagging & Registries
Docker Hub, private registries, versioning strategies
Docker Networking
connect containers securely
Docker Storage & Volumes
persistent data management
Docker Compose
multi-container applications
Docker Swarm
native container orchestration
Docker Security
secure your containers
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Docker Security Best Practices
image scanning, user namespaces, seccomp, AppArmor
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Container Image Scanning
Trivy, Clair, Docker Scout, vulnerability detection
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Docker Secrets Management
Swarm secrets, BuildKit secrets, environment variables
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Rootless Docker
running Docker without root privileges
Docker & Kubernetes
from containers to orchestration
Troubleshooting & Debugging
solve common Docker issues
Interview & Real-World Scenarios
ace your DevOps interview