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What Is Docker?
Docker packages an app and its dependencies into a container that runs the same anywhere.
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AiTechWorlds
AiTechWorlds
Docker packages applications into portable containers, and Kubernetes orchestrates them at scale. This visual guide explains Docker images, Dockerfiles, containers, Compose, and Kubernetes concepts like pods, nodes, services, and auto-scaling.
Docker packages an app and its dependencies into a container that runs the same anywhere.
Containers share the host OS and are lightweight; VMs include a full guest OS and are heavier.
An image is a read-only template with everything needed to run an app.
A Dockerfile is a script of instructions used to build a Docker image.
A container is a running instance of an image, isolated from the host.
Registries store and share images; Docker Hub is the most popular public one.
Volumes persist data outside a container so it survives restarts.
Docker networks let containers communicate with each other and the outside world.
Compose defines and runs multi-container apps from a single YAML file.
Kubernetes automates deploying, scaling, and managing containerized applications.
Orchestration handles scaling, healing, and networking across many containers automatically.
A pod is the smallest Kubernetes unit, wrapping one or more tightly coupled containers.
A node is a worker machine in a Kubernetes cluster that runs pods.
Deployments manage ReplicaSets to keep the desired number of pod copies running.
A Service gives pods a stable network address and load-balances traffic to them.
ConfigMaps store configuration; Secrets store sensitive data like passwords.
Kubernetes can scale pods up or down automatically based on load.
Ingress routes external HTTP traffic to the right services inside the cluster.
Kubernetes restarts failed containers and reschedules them to keep apps running.
Docker builds and runs containers; Kubernetes orchestrates many containers across machines.
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