22 - CONTAINERIZATION

Question 1

Why containerization ?

Answer 1

Containerization addresses the need for consistency, portability, efficiency, and scalability in software development and deployment. It simplifies the packaging and distribution of applications, making it easier to manage complex systems and adapt to the demands of modern software development practices.

Question 2

dockerhub setup

Question 3

docker file structure for app, web, db

Answer 3

Docker-files
app/Dockerfile
web/Dockerfile
db/Dockerfile
docker-compose/yml

Question 4

dockerhub repositories
app, db, web

Question 5

create docker file for app
https://github.com/devopshydclub/vprofile-project

From openjdk:11 as BUILD_IMAGE
RUN apt update && apt install maven -y
RUN git clone repo_url
RUN cd vprofile-project && git checkout docker && mvn install

FROM tomcat:9-jre11
RUN rm -rf /usr/local/tomcat/webapps/*
COPY - -from=BUILD_IMAGE vprofile-project/target/vprofile-v2.war /usr/local/tomcat/webapps/ROOT
EXPOSE 8080
CMD [“Catalina.sh”, “run”]
WORKDIR /usr/local/tomcat
VOLUME /usr/local/tomcat/webapps

Question 6

dockerfile for db

• FROM mysql:8.0.33
• LABEL “Project”=”name”
• LABEL “Author”=”Author name”
• ENV MYSQL_ROOT_PASSWORD=”vprodbpass”
• ENV MYSQL_DATABASE=”accounts”
• ADD db_backup.sql docker-entrypoint-initdb.d/db_backup.sql

Question 7

dockerfile for web server

• FROM nginx
• LABEL Project
• LABEL Author
• RUN rm -rf /etc/nginx/conf.d/default.conf
• COPY nginvproapp.conf /etc/nginx/conf.d/vproapp.conf

Question 8

run docker-compose file

version: ‘3.8’
services:
vprodb:
build:
context: ./Docker-files/db
image: vprocontainers/vprofiledb
container_name: vprodb
ports:
- ‘3306:3306’
volumes:
- vprodbdata:/var/lib/mysql
environment:
- MYSQL_ROOT_PASSWORD=vprodbpass

vprocache01:
	image: memcached
	ports:
		- '11211: 11211'
																			
vpromq01:
	image: rabbitmq
	ports: 
		- '15672: 15672'
	environment:
		- RABBITMQ_DEFAULT_USER=guest
		- RABBITMQ_DEFAULT_PASS=guest

vproapp:
	build:
		context: ./Docker-files/app
		image: vprocontainers/vprofileapp
		container_name: vproapp
	ports:
		– '8080:8080'
	volumes:
		-  vproappdata: /usr/local/tomcat/webapps    

vproweb:
	build:
		context: ./Docker-files/web
		image: vprocontainers/vprofileweb
		container_name: vproweb
	ports:
		– '80:80'
	volumes:
		-  vproappdata: /usr/local/tomcat/webapps    

volumes:
vprodbdata: {}
vproappdata: {}

Question 9

build all images

Answer 9

docker compose build

Question 10

start all containers

Answer 10

docker compose up

Question 11

upload images to dockerhub

Answer 11

docker login
docker push

Question 12

stop containers

Answer 12

docker compose down

Question 13

remove all images

Answer 13

docker compose prune

Question 14

containerize microservice project
https://github.com/devopshydclub/emartapp