Docker-Essentials

• Docker Engine installation guide - https://docs.docker.com/engine/install/ubuntu/
• !# Create and add admin docker user to docker group, add permissions
• useradd -m -s /bin/bash username
• usermod -aG docker username
• passwd username
• sudo usermod -aG sudo username
• id username
• su - username
• docker --version
• docker ps
• docker ps -a
• docker rm # remove container
• docker rmi # remove image
• docker images
• docker run -d -p 80:80 docker/getting-started
• service docker status
• docker stop # stop container
• docker start # start exiting container
• docker run ubuntu:20.04 ls
• docker run -d --rm --name My-Container ubuntu:20.04 echo "Hello my docker!"
• docker logs -f # live container logs

• docker system prune -a --volumes # remove all images and containers
• docker exec -it web1 /bin/bash # enter into container interactive

Port mapping | Two NGINX web servers from one VM

• docker run -d --name web1 -p 80:80 nginx
• cd /usr/share/nginx/html/
• echo "Web server 1" > test.html
• docker run -d --name web2 -p 8080:80 nginx

Environmental | MySQL

• docker run --name some-mysql -e MYSQL_ROOT_PASSWORD=my-secret-pw -d mysql:tag

• docker exec -it DB-mysql /bin/bash

• env # display details of mysql

• docker exec -it DB-mysql mysql -uroot -p # enter into mysql in container

• docker run --name DB-mysql2 -e MYSQL_ROOT_PASSWORD=pw1234 -e MY_VARS=1233456 -d mysql

Persistant data | Volumes

• docker run --name web01 -p 80:80 -d nginx
• ip a
• cd /opt/
• mkdir nginx
• cd nginx
• mkdir data
• docker run --name web02 -p 80:80 -v /opt/nginx/data:/usr/share/nginx/html -d nginx # Host volume
• docker run --name web02 -p 80:80 -v /usr/share/nginx/html -d nginx # Annonymus volume /var/lib/docker/volumes
• docker run --name web02 -p 80:80 -v /my_volume:/usr/share/nginx/html -d nginx # Named volume /var/lib/docker/volumes
• docker volume ls
• docker volume create infos
• docker volume rm infos

Docker Network

• docker network ls
• docker network create myNet01
• docker run --rm -it --name container1 nicolaka/netshoot /bin/bash
• docker run --rm -it --name container2 nicolaka/netshoot /bin/bash
• docker inspect container1
• docker run --rm -it --name container1 --net myNet01 nicolaka/netshoot /bin/bash
• docker run --rm -it --name container2 --net myNet01 nicolaka/netshoot /bin/bash
• docker network connect myNet01 container2
• docker network disconnect container2
• docker network create myNet02
• docker run --rm -it --name container1 --net myNet02 nicolaka/netshoot /bin/bash # Named Networks
• docker run --rm -it --name container1 --net host nicolaka/netshoot /bin/bash
• docker run --rm -it --name container2 --net host nicolaka/netshoot /bin/bash # Host IP
• docker run --rm -it --name container1 --net none nicolaka/netshoot /bin/bash # No IP
• docker network create -d macvlan --subnet 192.168.100.0/24 --gateway 192.168.100.1 --ip-range 192.168.100.99/32 -o parent=eth0 myMACvlan32 # creating macvlan
• docker run --rm -it --name container1 --net myMACvlan32 nicolaka/netshoot /bin/bash # macvlan
• docker network create -d macvlan --subnet 172.31.24.0/24 --gateway 172.31.24.1 --ip-range 172.31.24.207/32 -o parent=eth0 MyHomeLan

Volumes

• FROM ubuntu:22.04
• LABEL autor=Burmetskyi
• RUN apt-get update
• RUN apt-get install nginx -y
• WORKDIR /var/www/html/
• COPY files2/index.html
• COPY files2/script.sh /opt/script.sh
• RUN chmod +x /opt/script.sh
• ENV OWNER="Burmetskyi"
• ENV TYPE=demo
• EXPOSE 80
• ENTRYPOINT ["echo"]
• CMD ["Hello my FIRST Docker"]

Commands

• docker build
• docker tag name:version
• docker run --rm --name mydocker mydocker:v01
• docker image inspect mydocker:v01
• netstat -tulpe

nginx web server

• FROM ubuntu:22.04
• LABEL autor=Burmetskyi
• RUN apt-get update
• RUN apt-get install nginx -y
• EXPOSE 80
• EXPOSE 443/tcp CMD ["nginx","-g","daemon off"]

apache web server

• FROM ubuntu:22.04

• LABEL autor=Burmetskyi

• RUN apt-get update

• RUN apt-get install apache2 -y

• EXPOSE 80

• CMD ["apache2ctl","-D","FOREGROUND"]

• docker run -d --rm --name d1 -p 80:80 -v <absolute/path>:/var/www/html mynginx:01

ENV

• docker run -d --rm --name d2 -e TYPE=prod mynginx:05

FROM ubuntu:22.04

• LABEL autor=Burmetskyi

• RUN apt-get update

• RUN apt-get install apache2 -y

• RUN apt-get clean && rm -rf /var/lib/apt/lists/*

• WORKDIR /var/www/html

• COPY files/index.html .

• ENV OWNER=Burmetskyi

• ENV TYPE=demo

• EXPOSE 80

• CMD ["apache2ctl","-D","FOREGROUND"]

• docker run --rm --name d1 -it -e OWNER=Billie myenv:01 /bin/bash

SCRIPT.SH

• #!/bin/bash

• sed -i 's|%OWNER%|'"$OWNER"'|g' /var/www/html/index.html

• sed -i 's|%TYPE%|'"$TYPE"'|g' /var/www/html/index.html

• echo "Start Script --- OK"

• nginx -g 'daemon off;'

dokerfile

• FROM ubuntu:22.04
• LABEL author=Burmetskyi
• RUN apt-get update
• RUN apt-get install nginx -y
• RUN apt-get clean && rm -rf /var/lib/apt/lists/*
• WORKDIR /var/www/html
• COPY files/index.html .
• COPY files/script.sh /opt/script.sh
• RUN chmod +x /opt/script.sh
• ENV OWNER=Burmetwkyi
• ENV TYPE=demo
• EXPOSE 80
• CMD ["/opt/script.sh"]

PHP container

• phpinfo();

• phpinfo(INFO_MODULES);

• ?>

• FROM php:7.2-apache

• COPY index.php /var/www/html/

Python app

• num1 = input('Enter first number: ')

• num2 = input('Enter second number: ')

• sum = float(num1) + float(num2)

• print('The sum of {0} and {1} is {2}'.format(num1, num2, sum))

• FROM python:3

• WORKDIR /usr/src/app

• COPY sum.py ./

• CMD [ "python", "./sum.py" ]

Docker-compose

• Install Docker Compose: https://docs.docker.com/compose/install/linux/

• docker compose up
• docker compose logs -f
• docker compose stop
• docker compose down

Docker Portainer

• how to install Portainer: https://docs.portainer.io/start/install-ce/server/docker/linux

Docker, Dockerfile, and Docker-Compose | O'REILLY

• docker run --rm -v ${PWD}:/myvol ubuntu /bin/bash -c "ls -lha > /myvol/myfile.txt"