#Docker

Docker

• Docker is an open platform for developing, shipping, and running applications.
  • Makes Easy –> deploy, replicate, move
• Docker provides the ability to package and run an application in a loosely isolated environment
• Docker is an open-source project based on Linux containers.

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Docker

Docker installation

• Check docker
  • docker version
  • sudo docker run hello-world
• On Linux
  • Docker client, Docker deamon and Container runs on the same Host
• On Window or MacOSX
  • Docker deamon cannot be run directly on Non-Linxu platform natively because it user Linux specific Kernal feature
  • Need to run inside Docker-Machine
    • Install Docker Desktop

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Docker Custom Image

• Developer –> Define Dockerfile –> Creates Docker Image

Dockerfile

• Dockerfile is used to create custom docker image
• It’s a text document that contains all the instructions users provide to assemble an image.
• Instructions specify what to do when building the image.
• Can have –> runtime env, libraries, environment variables, and configuration files.

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Docker-Compose

• DC makes it easier to configure and run applications made up of multiple containers
• DC is a very handy tool to quickly get docker environment up and running.
• It uses yaml files to store the configuration of all the containers
• We can create some containers like: web app, postgres and redis
  • and can establish an internal connection

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