42 lines
2.0 KiB
Markdown
42 lines
2.0 KiB
Markdown
#### Snippet of backend(Node.js)`DockerFile`
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You will find this `DockerFile` file in the root directory of the project.
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```bash
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FROM node:13.13.0-stretch-slim
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#Argument that is passed from docer-compose.yaml file
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ARG NODE_PORT
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#Echo the argument to check passed argument loaded here correctly
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RUN echo "Argument port is : $NODE_PORT"
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# Create app directory
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WORKDIR /usr/src/app
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#COPY . .
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COPY . .
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# Install app dependencies
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# A wildcard is used to ensure both package.json AND package-lock.json are copied
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# where available (npm@5+)
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RUN npm install
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#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:
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EXPOSE ${NODE_PORT}
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CMD npm run dev
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```
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##### Explanation of backend(Node.js) `DockerFile`
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- The first line tells Docker to use another Node image from the [DockerHub](https://hub.docker.com/). We’re using the official Docker image for Node.js and it’s version 10 image.
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- On second line we declare argument `NODE_PORT` which we will pass it from `docker-compose`.
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- On third line we log to check argument is successfully read
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- On fourth line we sets a working directory from where the app code will live inside the Docker container.
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- On fifth line, we are copying/bundling our code working directory into container working directory on line three.
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- On line seven, we run npm install for dependencies in container on line four.
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- 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`.
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- 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.
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###### :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__.`
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