How to dockerize a React app with Nest JS server code...!

Namaste coders :) Welcome to my tech blog on dockerizing React app with one of Node's typescript framework. This is my first ever post in DEV, excited to contribute it

Basically, there are two ways you can dockerize them,

1. Dockerize both React app and Nest JS separately and compose them.
2. Dockerize both of the apps in a single docker file.

1.Dockerize both React app and Nest JS separately and compose them.

a). Dockerize React app :

Create a docker file as below in React app-

FROM node:14.16.1WORKDIR /appCOPY package.json ./ RUN npm installCOPY . .EXPOSE 3000CMD ["npm", "start"]`

Also create a .dockerignore file

node_modules.git.gitignore

Next step is that we have to build the docker image of the React app.

 docker build . -t react

Now run the tagged image as below.

 docker run --name react -d -p 80:3000 react

Open http://localhost:3000 and you should see React served from Docker.

Also you can check the docker container running as below with docker ps command.

CONTAINER ID   IMAGE     COMMAND                  CREATED       STATUS         PORTS                                   NAMES6aea1cf12647   react     "docker-entrypoint.s"   11 days ago   Up 3 seconds   0.0.0.0:80->3000/tcp, :::80->3000/tcp   react

b). Dockerize Nest JS code :

Create a docker file as below in your server directory-

FROM node:14.16.1WORKDIR /appCOPY package.json ./RUN npm installCOPY . .EXPOSE 5000CMD [ "npm", "run", "start:dev" ]

As similar to above create a .dockerignore file

node_modules.git.gitignore

Next step is that we have to build the docker image of the server app.

 docker build . -t server

Now run the tagged image as below.

 docker run --name server -d -p 80:5000 server

Let's check this by hitting http://localhost:5000 and you should see your Nest JS being served from Docker.

So, now we have stepped into the final process of running both simultaneously by creating docker compose yaml file in the project root directory as below.

version: "3"services:    frontend:        container_name: client        build:            context: ./client            dockerfile: Dockerfile        image: react        ports:            - "3000:3000"        volumes:            - ./client:/app    backend:        container_name: backend        build:            context: ./server            dockerfile: Dockerfile        image: server        ports:            - "5000:5000"        volumes:            - ./server:/app

Run the command docker-compose up and you should see both the apps running.

2.Dockerize both of the apps in a single docker file.

I would recommend this approach than the above, it's simple and preferred to follow for deploying these kind of applications for dev, qa and prod environments.

As we have both apps React and Nest JS server code. We initially need to build our React UI code and should copy the build folder contents as below -

After, we need to paste them in public folder of the Nest JS server code root directory.

Note: In Nest JS, you need to place server static module in app.module.ts file as below

  ServeStaticModule.forRoot({    rootPath: join(__dirname, '..', 'public'),  }),

Finally, you are all set to run the docker file with commands below

FROM node:14.16.1:lts-alpineRUN mkdir -p /usr/src/appWORKDIR /usr/src/appCOPY . .RUN cd ./client && npm ci  && npm run build && cd ..RUN cd ./server && npm ci  && cd ..RUN mkdir -p /usr/src/app/server/publicRUN cp -r ./client/build/* ./server/public/WORKDIR  /usr/src/app/serverRUN npm run prebuildRUN npm run buildEXPOSE 5000CMD [ "npm", "run", "start:dev" ]

Build the docker file

 docker build . -t ReactServer

And finally run the image

docker run --name ReactServer -d -p 80:5000 ReactServer

Open http://localhost:5000 and you should see the application served from Docker.

Congratulations you successfully dockerized React UI and Nestjs server...

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