What is Docker ? | Basic Commands | Docker Simplified

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Docker Container

Docker as you all might have heard off is a tool which is used for deployment of applications in a container which ensures that the application will run in an environment which is isolated.

Coming to Containers it can be though of as a black box inside which all the things which are needed for the application to run are present. Docker tool leverage the use of containers to achieve its tasks.


Advantages/Disadvantages :

  • Compared to Virtual Machines the Docker is very light weight and portable as it does not include the Guest OS.
  • Boot up time of the docker containers is very less compared to VM.
  • The size of the Docker containers is very less compared to VM.
  • On the Scalability point of view Docker is much more scalable.
There are some downsides to containers as well
  • we cannot expect it to run as efficiently as with bare metals because it depends on the host machine for the resources.
  • Also from the security point of view it is less secure compared to VM because it shares the host OS.

Components :

  • CLI
  • Deamon - Controls the images and the container
  • Docker Rest API
  • Docker Registry
Communication from CLI to Daemon happens via REST API

Basic Commands :

 

All commands in Docker starts with the Docker keyword.

  • Docker images : To list all images downloaded so far
  • Docker pull <image name> : To download image from registry
  • Docker run : create and run new container
  • Docker start : start an existing (But stopped) container
  • Docker stop : stop a running container
  • Docker run --name <Container Name> -d/-t  -p 8080:3000  <image name> : To spin up a container from the image given the port 8080 is at the host end and 3000 is at the container end.
  • Docker top <container name> : To list the processes started within the container.
  • Docker inspect <container name>/<container Id>

Suggested Read : Basic Docker Keywords

Summary:

  • Containers are running instances of images.
  • Image is a Read-only File system made of layers.
  • Each layer is an image which may contain a specific application, library or runtime.
  • Container has a writable layer(It is associated with a container not with image).


It will be helpful if you could comment below if you want any more topics to be covered 😊





Location: India

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