Docker Devops

Step 1 : pull an ubuntu image from docker hub and create a container

docker pull ubuntu
docker run -it ubuntu

Step 2 : Make your own image...create a dockerfile to create a nodejs image

FROM node:20-alpine
WORKDIR /app
COPY . .
CMD node hello.js

Step 3 : build the image

docker build -t mynodeapp .

Step 4 : run the container

docker run mynodeapp

step 5 : Run in with -it flags and shell access

docker run -it mynodeapp sh

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Create a non root user and run the container with that user

RUN addgroup devgroup && adduser -S -G devgroup devuser
USER devuser