Docker Containers v/s Virtual Machines

Docker

  - Application Delivery Technology
  -  Build an application with a Docker Image
  - Ship an application with Docker Hub
  -  Run an application with Docker Container
  - Avoid single point of failure

Docker Compose

   Defining and Running multi-container Applications.

   - Configuration defined in one or more files

   docker-compose.yml(default)

   docker-compose.override.yml(default)

   Multiple files specified using -f

   All paths relative to base configuration file

- Great for dev, staging, and CI

 Docker Swarm

  Native clustering for Docker

  Provides a unified interface to a pool of Docker hosts

  Fully integrated with Machine and Compose

  Serves the standard Docker API

  1.2 - Ready for Production

    - Reschedule containers when a node fails

    - Better node management

Differences between docker containers and virtual machines can be measured based on the operating system support, security, portability, and performance

Below diagram shows details information

References : https://www.docker.com/captains/arun-gupta