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Docker

Docker is a popular containerization platform that automates application deployment using containers.

Key Concepts​

  • Image: Read-only template for creating containers.
  • Container: Running instance of an image.
  • Dockerfile: Script to build custom images.
  • Volume: Persistent storage for containers.
  • Network: Isolated communication between containers or with the host.

Input:

docker ps -a

Output:

CONTAINER ID   IMAGE          COMMAND                  CREATED        STATUS                     PORTS     NAMES
e1f3b2d1c2a4   nginx:latest   "nginx -g 'daemon of…"   2 hours ago    Up 2 hours                 80/tcp    webserver

Shows all Docker containers, including stopped ones, with their image, command, and status.

Input:

docker run -d --name webserver -p 8080:80 nginx:latest

Starts a new container in detached mode with port mapping 8080→80.

References: