DevOps Classroom notes 04/Sep/2026

two Ways to create docker images

1. interactively : manually run container and then save as an image

2. Dockerfile (instructions-based): build image based instructions (automatically create image)

3. interactively method:

• first need run container

docker run -d --name web1 -p 80:80 nginx

download sample website

mkdir website
cd website
wget https://www.tooplate.com/download/2168_sweet_bakery
cp 2168_sweet_bakery 2168_sweet_bakery.zip
sudo apt install unzip
unzip 2168_sweet_bakery.zip
docker cp . web1:/usr/share/nginx/html/

out put

Successfully copied 817kB (transferred 828kB) to web1:/usr/share/nginx/html/

verify server by access port 80

http://20.46.241.140/

svae the container

docker commit web1 2168_sweet_bakery:1.2.0
docker images

docker run -d --name sweet_bakery -p 8080:80 2168_sweet_bakery:latest

2. Dockerfile referance

• to create image we need follow docker instructions

1. FROM – base image (os image or required configuation image ) Ex: ubuntu , oracle-linux, alpine (lite weight linux kernal os), java, python, dotnet, windows-dotnet …etc

2. WORKDIR – set working directory in docker image

3. COPY – copy local files to my docker image

4. ADD – downloads files or packages

5. RUN – Execute commands during build ex:

alpine - apk add git
ubuntu - apt-get install git -y
oracle-linux - yum install git -y
windows - winget install git -y 

6. EXPOSE – application ports
7. CMD – command to run when container start ex: java -jar spring.jar
8. entrypoint – run first command when container start

task:

1. create docker image using interactively method
2. https://www.tooplate.com/free-templates free templates