How to dockerize a React app with Nest JS server code...!
Tags: react, docker, typescript
Published: 2021-07-23 05:40:01

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:14.16.1

WORKDIR /app

COPY package.json ./ 

RUN npm install

COPY . .

EXPOSE 3000

CMD ["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                                   NAMES
6aea1cf12647   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:14.16.1

WORKDIR /app

COPY package.json ./

RUN npm install

COPY . .

EXPOSE 5000

CMD [ "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 - 

![Alt Text](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/xjfzr93av9h0ria6u4sa.jpg)

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-alpine
RUN mkdir -p /usr/src/app

WORKDIR /usr/src/app

COPY . .

RUN cd ./client && npm ci  && npm run build && cd ..

RUN cd ./server && npm ci  && cd ..

RUN mkdir -p /usr/src/app/server/public

RUN cp -r ./client/build/* ./server/public/

WORKDIR  /usr/src/app/server

RUN npm run prebuild

RUN npm run build

EXPOSE 5000

CMD [ "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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