This allows us to take advantage of cached Docker layers. Note that, rather than copying the entire working directory, we are only copying the package.json file. RUN npm install # If you are building your code for production # RUN npm ci -only=production # Install app dependencies # A wildcard is used to ensure both package.json AND package-lock.json are copied # where available COPY package*.json. Please note that if you are using npm version 4 or earlier a package-lock.json file will not be generated. This image comes with Node.js and NPM already installed so the next thing we need to do is to install your app dependencies using the npm binary. Next, we create a directory to hold the application code inside the image, this will be the working directory for your application: # Create app directory WORKDIR /usr/src/app Here we will use the latest Node, version 11. ![]() The first thing we need to do is define from what image we want to build. Creating a DockerfileĬreate a file as D ockerfile touch Dockerfile # OR nano Dockerfile In the next steps, You are going to create a Dockerfile. If not, this simple application will give you a basic app to deploy.įirst, create a new directory and create a package.json file inside: `) Note: You can use a pre-existing application if you have Node projects on your computer. An image is the blueprint for a container, a container is a running instance of an image. Usually, a container consists of an application running in a stripped-to-basics version of a Linux operating system. Using that file, you can create a Docker container which can run on any platform without installing any libraries on the actual machine.ĭocker allows you to package an application with its environment and all of its dependencies into an encapsulated “box”, called a container. To create a Docker container, you need to create a Dockerfile on your project. You should install Docker first to be able to run docker commands. This article will show you how to create a Dockerfile for your Node application to enable it to run as a Docker container.
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