execute a command in container from normal terminal
docker exec "container name" "command"
connect terminal to container's terminal
docker exec -it "container name" bash
port maping - exposing container port to local machine port
docker run -it -p "local port":"internal port" "image"
docker run -it -p 6000:80 nginx
passing env vars for container
docker run -it -p 6000:8000 -e key=value -e key=value nginx
containerizing nodejs app
step 1 : create Dockerfile in the application source code
step 2 : add details/configuration of image
FROM ubuntu
RUN apt-get update
RUN apt-get install -y curl
RUN curl -sL https://deb.nodesource.com/setup_18.x | bash -
RUN apt-get upgrade -y
RUN apt-get install -y nodejs
COPY package.json package.json
COPY package-lock.json package-lock.json
COPY main.js main.js
RUN npm install
ENTRYPOINT [ "node", "main.js" ] // if the container started this command executed
step 3 : run the following command to create your custom image
docker build -t "image name" "Folder location of Dockerfile"
docker build -t myfirst-image .
step 4 : create repository on dockerhub like nodejsapp then copy image name <username>/nodejsapp and build your image with this name locally and move to step 5
step 5 : publish docker image on dockerhub
docker push nikhivishwa/nodejsapp
step 6 : use docker image
docker run -e PORT=8000 -p 8000:8000 nikhivishwa/nodejsapp
running docker compose
docker compose up
running docker compose in detach mode (in background)
docker compose up -d
remove docker compose
docker compose down
Docker net working
inspect bridge network (it is default mode)
docker network inspect bridge
list all networks
docker network ls
networking types
in bridge network we have to explicitly mention or expose ports bcz the are inside the docker container
in host network the docker container and locale machine are at same network so the machine's port is availabvle to container
in none network the docker container doesnot have the internet access
create custom network
docker network create -d bridge mynetwork
create container with custom network
docker run -it --network-mynetwork --name tony_stark ubuntu
volume mounting
docker run -it -v /d/"github repository"/Docker:/home/docker-app ubuntu
mounting the machines directory to container to prevent data loss when container is destroyed
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