gokuld6012 / docker-node-app

This is a basic node application build on docker container. Details of this project is to explain from scratch.

Introduction

Docker is container runs as a guest operating system. It is pretty similar like VM but vm does not share their resources with other vm. On the other hand container share their resources with other container on same host machine.

How to run your node app to docker

First build a node app with express generator like below:

create a directory

mkdir docker-node-test

Go the project directory

cd docker-node-test

Install express generator globally

npm install -g express-generator

Create your express app

express -f

create a docker file

touch Dockerfile

Now update your docker file based on your requirements. Here is mine

FROM node:7
WORKDIR /app
COPY package.json /app
COPY . /app
RUN npm install
CMD ["npm", "start"]
EXPOSE 4000

Here is the explanations of the above code base

FROM node:7
-- You are telling to docker to get node 7 to build your project from wherever
docker knows where to get it.

WORKDIR /app
-- Create a directory inside of the container called "app"

COPY package.json /app
-- copy your local package.json to the containers app directory

COPY . /app
-- Copy your whole applications to the app folder/direcoty of the container

RUN npm install
-- Run npm install to fetch all the project dependency

CMD ["npm", "start"]
-- Start your node application.

EXPOSE 4000
-- You are exposing the application port to outside of the container

Build your application container

docker build -t your-tag-for-the-applications .

-t is used to tag the app

Run your application container

docker run -p your-host-machine-port:your-exposed-port-from-docker YourAppName

Inspect your app

docker ps yourappname

Sharing docker image

First Singup an account at hub.docker.com

Now build the app again for your docker account

docker build -t [your-docker-hub-username]/yourProjectName

Now login to your docker hub account:

docker login

Enter your user name and password

Now push your code to docker hub.

docker push [your-dockerhub-username]/yourProjectName

Now you can run your docker image on any server or PC with docker installed

Get the image from docker hub

docker pull

Run the image

docker run [your-dockerhub-username]/yourProjectName

Removing all the container and Images

List all containers (only IDs)

Stop all running containers

docker stop $(docker ps -aq)

Remove all containers

docker rm $(docker ps -aq)

Remove all images

docker rmi $(docker images -q)