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react-express-mongodb/backend/README.md
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@ -4,18 +4,18 @@ You will find this `DockerFile` file in the root directory of the project.
```bash
FROM node:13.13.0-stretch-slim
#Argument that is passed from docer-compose.yaml file
#Argument that is passed from docker-compose.yaml file
ARG NODE_PORT
#Echo the argument to check passed argument loaded here correctly
RUN echo "Argument port is : $NODE_PORT"
# Create app directory
WORKDIR /usr/src/app
#COPY . .
COPY . .
# Copy dependency definitions
COPY package.json /usr/src/app
# Install app dependencies
# A wildcard is used to ensure both package.json AND package-lock.json are copied
# where available (npm@5+)
RUN npm install
# Get all the code needed to run the app
COPY . /usr/src/app
#In my case my app binds to port NODE_PORT so you'll use the EXPOSE instruction to have it mapped by the docker daemon:
EXPOSE ${NODE_PORT}
CMD npm run dev
@ -29,13 +29,15 @@ CMD npm run dev
- On third line we log to check argument is successfully read
- On fourth line we sets a working directory from where the app code will live inside the Docker container.
- On fourth line we set a working directory ,where the app code will be set to present inside the Docker container.
- On fifth line, we are copying/bundling our code working directory into container working directory on line three.
- On fifth line, we are copying our dependency file (i,e package.json) into container working directory which was set on line four.
- On line seven, we run npm install for dependencies in container on line four.
- On sixth line, we run npm install for dependencies installation in container.
- On line seven, we are copying/bundling our code working directory into container working directory which was set on line four.
- On Line eight, we setup the port, that Docker will expose when the container is running. In our case it is the port which we define inside `.env` file, read it from `docker-compose` then passed as a argument to the (backend)`DockerFile`.
- And in last, we tell docker to execute our app inside the container by using node to run `npm run dev. It is the command which I registered in __package.json__ in script section.
- And at last, we tell docker to execute our app inside the container by using node to run `npm run dev. It is the command which I registered in __package.json__ in script section.
###### :clipboard: `Note: For development purpose I used __nodemon__ , If you need to deploy at production you should change CMD from __npm run dev__ to __npm start__.`