DevOps Classroom notes 06/Dec/2025

Containerizing the website

Option 1: Manually creating a docker image

Steps:

• lets create a vm and setup docker
• Lets create a nginx container

docker run -d --name infinite_loop -P nginx

• Lets findout the folder where website can be copied /usr/share/nginx/html
• commands to execute

cd /tmp/
mkdir infinite
cd infinite/
wget https://www.tooplate.com/zip-templates/2117_infinite_loop.zip
apt install unzip -y
sudo apt install unzip -y
unzip 2117_infinite_loop.zip
ls
cd 2117_infinite_loop/
ls
docker --help
docker cp --help
docker ps
docker cp . infinite_loop:/usr/share/nginx/html
docker exec infinite_loop ls /usr/share/nginx/html
docker exec infinite_loop ls -al /usr/share/nginx/html
docker --help
docker commit --help
docker commit infinite_loop infinite_web
docker image ls
docker run -d --name infinite_2 -P infinite_web:latest
docker ps
docker rm -f $(docker ps -a -q)
docker run -d --name web_1 -P infinite_web:latest
docker run -d --name web_2 -P infinite_web:latest

• The problem with above approach is for every change we need to do this manual steps.

Option 2: Dockerfile

• Dockerfile has set of instructions on the steps that needs to be executed to create a image
• Dockerfile
• create a new directory. and create a file called as Dockerfile
• Ensure your website is present in same directory
• In Dockerfile we have many instructions
  • FROM: This sets the base image
    • with FROM always use a tag
  • COPY
  • Expose
• Dockerfile

FROM nginx:1.29
COPY . /usr/share/nginx/html/
EXPOSE 80/tcp

• Now lets build a image based on this Dockerfile
  
• Now run the container with the image

docker run --name web1 -d -P infinite_image:v1.0
docker ps

• docker image can be tagged to have multiple aliases

docker image tag infinite_image:v1.0 shaikkhajaibrahim/infinite_image:v1.0

• I want to push this image to my dockerhub account: refer to prompt below

Give me instructions to push a image to docker hub right from signing up configuring credentials and pushing images

Now lets redo this for a different website

• Website zip Refer Here
• watch classroom recording
• observation: while pulling the images sometimes we are seeing Already Exists
  

Exercise

• Repeate the image building with following base images
  • httpd
  • alpine (install nginx)