Docking with Docker

Docking with Docker
A Gentle Introduction on Docker

Agenda
● Docker Overview
● Popular Vocabularies
● Some Geek Stuffs
● More Technical
Stuffs with
live demos
● Docker Compose
with live demo
● QA Session

Arnab
Software Engineer
Cefalo Bangladesh Ltd.
Consultant for NHST Global Team
Email: arnab.shil@nhst.com
Website: ruddra.com

Shovon
Software Engineer
Cefalo Bangladesh Ltd.
Consultant for NHST Global Team
Email: arshovon@nhst.com
Website: linkedin.com/in/arshovon

Docker Overview
Why you need us to use Docker?

What is Docker?
● An open platform to build, ship, and run distributed applications, whether on
laptops, data center VMs, or the cloud.
● Automates the deployment of applications inside containers.

Development Setup != Production Setup (<2014
B.D.)

War between Developer and Operator

Here Comes The Super Chief: Mr. Docker :)

Why Docker?
● Same setup
everywhere
● Rapid deployment
● Easy
maintainability
● Faster
configurations

Docker Disadvantages
● Slow build process
● Connect to existing
services
● Resource consumption

Docker Vocabularies
Docker Container
A standardized unit of software
Provides OS level virtualization
Docker Image
Includes code, libraries & environment
Container is a runtime instance of an
image
Docker Hub / Store
Share images using Docker Hub repositories
Buy certified images from Docker store**
Docker Volume
Define data volumes for a service
Persist even when containers are
terminated

Geek Stuffs
Details on Docker’s Internal things

Difference
between
Virtualization and
Containerization

Continuous Integration (CI) & Continuous Deployment
(CD) Workflow

More Technical Stuff
Run docker in your machine

Docker Install
MacOs: https://docs.docker.com/docker-
for-mac/install/#download-docker-for-mac
Windows:
https://docs.docker.com/docker-for-
windows/install/
Ubuntu:
https://docs.docker.com/install/linux/dock
er-ce/ubuntu/#install-using-the-repository

Docker Pull means to pull image from dockerhub registry(hub.docker.com).
Command:
docker pull <image-name>:<tag>
Example:
docker pull mysql:latest
Docker Pull

Docker Build
What is Docker Build?
Building Image from a Dockerfile.

Build From Remote Source(Git)
Command:
docker build <git-repository-link>#<branch_name> -t=”image-name”
Example:
docker build https://github.com/ruddra/docker-example.git#build-from-remote
-t='docker-remote'

#Dockerfile Example
from python:latest
add . /code
WORKDIR /code
RUN pip install -r requirements.pip
EXPOSE 5000
CMD python flask_app.py
Custom Dockerfile

Build Within Local Machine
Command:
docker build <path-to-docker-file> -t=”<image-name>”

Docker Run
Command:
docker run <image-name> <docker-port>:<local-machine-port>

Docker Set Environment Variable
Command:
docker run -e <ENVIRONMENT-VARIABLE-1>=<VALUE-1> <ENVIRONMENT-VARIABLE-
2>=<VALUE-2> <image-name>
Example:
docker run -e MYSQL_ROOT_PASSWORD=root -e MYSQL_USER=root -e
MYSQL_PASSWORD=root -e MYSQL_DATABASE=mydb mysql

Docker Hub AKA Docker Cloud
Login Command:
docker login
Tag your Image for Docker Hub:
docker tag my_image $DOCKER_ID_USER/my_image
Push your Image to Docker Hub:
docker push $DOCKER_ID_USER/my_image
Push your Image for Docker Hub:
docker pull $DOCKER_ID_USER/my_image

Docker Useful Commands
Remove Container:
docker rm <container-id>
Show running container:
docker ps
Show all containers:
docker ps -a
Docker shell:
docker exec -it <container-id-OR-name> bash

Docker Compose
● Tool for defining and running multi-container
Docker applications
● Use a YAML file to configure application’s
services
● Call all the services using single command
● Same everywhere:
○ Production
○ Staging
○ Development
○ Testing
○ CI

Docker Compose Useful Commands
Build Containers:
docker-compose build
Create and start containers:
docker-compose up
Stop and remove containers, networks, images, and volumes:
docker-compose down
Execute a command in a running container:
docker-compose exec

Docker Compose Useful Commands (Continue)
Start services:
docker-compose start
Stop services:
docker-compose stop
Restart services:
docker-compose restart
Remove stopped containers:
docker-compose rm

Thank you
Please don’t ask more
questions :)

Docking with Docker

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Editor's Notes