Session-1 Docker Intro, Kernel, Namespaces, Control Group, Docker Engine, Architecture and more

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************* Getting Started With Docker *************
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What is Docker ?
How Docker works?

Installation and configuration Docker on Amazon Linux:
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$ sudo yum install docker -y

Start Docker:
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$ sudo service docker start

Verify Docker:
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$ docker version

Docker Status:
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$ sudo service docker status

Architecture / FileSystem:
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/ filesystem for base VM

$ ls
bin boot dev etc home lib lib64 local media mnt opt proc root run sbin srv sys tmp usr var

# cd /var/lib/docker/

[root@ip-172-31-35-167 docker]# pwd

/var/lib/docker

[root@ip-172-31-35-167 docker]# ls
buildkit containers image network overlay2 plugins runtimes swarm tmp trust volumes

Understanding Images and Working with Images:
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$ sudo docker image --help

Usage: docker image COMMAND

Manage images

Commands:
build Build an image from a Dockerfile
history Show the history of an image
import Import the contents from a tarball to create a filesystem image
inspect Display detailed information on one or more images
load Load an image from a tar archive or STDIN
ls List images
prune Remove unused images
pull Pull an image or a repository from a registry
push Push an image or a repository to a registry
rm Remove one or more images
save Save one or more images to a tar archive (streamed to STDOUT by default)

tag Create a tag TARGET_IMAGE that refers to SOURCE_IMAGE

Run 'docker image COMMAND --help' for more information on a command.

ls: List images:
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$ sudo docker image ls

OR

$ sudo docker images

Docker Hub:
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Registry is for docker images

It is one of docker component

Official URL:
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https://hub.docker.com/


CentOS Docker Image:
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$ sudo docker pull centos


CentOS Tags:
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$ sudo docker pull centos:centos7.9.2009

rm : Remove one or more images:
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$ sudo docker image rm (image-id or image-name)

$ sudo docker image rm eeb6ee3f44bd


Deep Dive Description Image:
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inspect : Display detailed information on one or more images

$ sudo docker image inspect e24920a53db8