A quick introduction of docker containerization. This slide provides overview of other related things such as docker-compose, swarm mode and orchestration.

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

2. Bhanuchander210
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

3. Bhanuchander210
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