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--- docker [March 16, 2026 at 01:06] – yanevskiv
+++ docker [August 22, 2026 at 15:22] (current) – external edit 127.0.0.1
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+# Docker
+**Docker** is a containerization platform that packages your application and its dependencies into a lightweight, portable unit called a container. Run `docker run` to start a container from an image; it starts instantly and includes everything your app needs—no "works on my machine" problems.
+An **image** is a blueprint: a layered filesystem snapshot plus metadata. A **container** is a running instance of an image, with its own isolated filesystem, network, and environment. Build images from a Dockerfile, run containers from images, and share images via a registry (Docker Hub, private registries, etc.).
+```bash
+$ docker build -t myapp .     # build an image from Dockerfile
+$ docker run myapp            # run a container from an image
+$ docker push myapp           # push image to registry
+$ docker pull myapp           # pull image from registry
+```
+Containers are ephemeral by default—data disappears when they stop. Use volumes for persistent storage, networks to link containers, and Compose to orchestrate multi-container apps.
+## Concepts
+. [[docker-images|Images]]
+. [[docker-containers|Containers]]
+. [[docker-dockerfile|Dockerfile]]
+. [[docker-building|Building images]]
+. [[docker-running|Running containers]]
+. [[docker-volumes|Volumes]]
+. [[docker-networks|Networks]]
+. [[docker-registries|Registries]]
+. [[docker-pulling-and-pushing|Pulling and pushing]]
+. [[docker-tagging|Tagging]]
+. [[docker-layers|Layers]]
+. [[docker-entrypoint-and-cmd|Entrypoint and CMD]]
+. [[docker-environment-variables|Environment variables]]
+. [[docker-ports|Ports and networking]]
+. [[docker-compose|Compose]]