The document provides an overview of Docker and its related concepts, including Docker images, commands, and container orchestration with Docker Swarm. It highlights the differences between virtualization methods and emphasizes the advantages of containerization, such as reduced resource consumption. Additionally, it presents a sample Docker Compose configuration for deploying a MySQL and WordPress setup.

1. Docker
Bhanuchander210
A Dev-Ops Tool Info
Written in : Go
Author : Solomon Hykes

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Virtualization
Type 1 :
● One OS doesn’t affect other / Gyest OS
● Ex : Microsoft Hyper-V, VMware ESXi Server, Xen Server
Type 2 :
● Host-Guest OS Methodology
● Ex : Microsoft Virtual PC, VMware Workstation, Oracle VBox

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Containerization
OS level Virtualization
●
● Isolated virtual machine like user space running instances
●
● Ex : Zones, Virtual Kernels
Virtual Machine
● Having Hypervisor.
● It consumes more. For
example ~1.2Gb/instance
● So heavier
● Slower
● Needs bigger footprint (RAM
and storage)
Containers
● Replaces hypervisor.
● Consumes very less
~2.5Mb
● Lightweight
● Faster
● Smaller footprint (No RAM
and individual storage)

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Docker Images
Docker Image
|---- CMD Layer
|---- EXPOSE Layer
|---- WORKDIR Layer
|---- RUN Layer
|---- Base Image Layer
|---- bootfs
Layers

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Docker Infra

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How To ?
Build Run
Quick Demo Video : Installation - Build - Run

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Docker Commands
Basic
● docker inspect - Inspecting the information about the custom object.
● docker rm - Removing the object provided in arg.
● docker info - Printing the docker information.
● docker rename - All objects can be renamed.
● docker login - Registry Login
● docker logout - Registry Logout
For containers,
● docker container
● docker ps - Process status for current running processes.
● docker start - Initiating the container.
● docker restart - Restarting the already started container.
● docker cp - Copy the files from the local directory to the container path.
● docker port - Port mapping on running container.
● docker pause
● docker unpause
For Images,
● docker image
● docker search - Search images in customized docker registry.
● docker pull - Pulling images from registry.
● docker push - Pushing images to the customized registry.
● docker save - Save the image as compressed file.
● docker load - Load the compressed file as an image.
● docker rmi - Removing images.
● docker run - Create + Start the container in single command.
Others
● docker volume - Mounting the local directory as a volume object to
the container.
● docker network - Network configuration customizing for bridge,
vlan and overlay networks.
● docker stats - Statistics on the container information on the
machine environment.
● docker top - Normal Top command for quick view.

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Docker Compose
Docker-compose.yaml
version: '3.3'
services:
db:
image: mysql:5.7
container_name: mysql_database
volumes:
- db_data:/var/lib/mysql
restart: always
environment:
MYSQL_ROOT_PASSWORD: word@press
MYSQL_DATABASE: wordpress
MYSQL_USER: wordpress
MYSQL_PASSWORD: abc@123
wordpress:
depends_on:
- db
image: wordpress:latest
container_name: wd_frontend
volumes:
- wordpress_files:/var/www/html
ports:
- "8000:80"
restart: always
environment:
WORDPRESS_DB_HOST: db:3306
WORDPRESS_DB_USER: wordpress
WORDPRESS_DB_PASSWORD: abc@123
volumes:
wordpress_files:
db_data:
Run schema for Multiple Containers

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Docker Swarm
Raft consensus in swarm mode
http://thesecretlivesofdata.com/raft/
Can Tolerate upto (N-1)/2 Node failures

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Docker Swarm
Master
> docker swarm init
> docker stack deploy -c stack.yml myname
Worker
> docker swarm join --token ***** ip:port
In Master Node :
> docker stack ps msql
ID NAME IMAGE NODE CURRENT STATE
r3qnn6q8v83m msql_db.1 mysql:latest bhanuchander.nmsworks.co.in Running 13 minutes ago
bu06hxyucifm msql_adminer.1 adminer:latest bhanuchander.nmsworks.co.in Running 11 minutes ago
Container Names will be skipped . . . !

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Overview
Running Containers
Single/Swarm
Docker-Compose
?
Our application Local Host
Docker Image

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Others:
● Rancher
● Docker Machine
● Kubernetes vs Rancher vs Docker Machine
Deployment:
Objects
● POD
● Replica Set
● Deployment
● Service
● Namespace
In my system around 53 types of kubernetes Controllers and objects are available..
Demands for Swarm Cluster
Ex : Minikube, katakoda,....
Kubernetes