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displayName : Context Directory name : CONTEXT_DIR value : react-hello-world displayName : Git Reference name : SOURCE_REPOSITORY_REF value : master - description : Set this to the relative path to your project if it is not in the root of your repository. displayName : Git Repository URL name : SOURCE_REPOSITORY_URL required : true value : - description : Set this to a branch name, tag or other ref of your repository if you are not using the default branch. displayName : Name name : NAME required : true value : react-hello-world - description : The URL of the repository with your application source code. These will be our default variable values, which we’ll override later:ĪpiVersion : /v1 kind : Template objects : - apiVersion : v1 kind : ConfigMap metadata : name : $ weight : 100 wildcardPolicy : None tls : termination : Edge parameters : - description : The name assigned to all of the frontend objects defined in this template. Setting up environment variables in the appįirst we define environment variables in a file, like static/environment.js. This is good, because it means we don’t to have to build a new image for each environment’s config (building a different image for each environment is an anti-pattern). We can inject the file at runtime using a ConfigMap. We don’t need to build any configuration files into our image at all. Thanks, Javaad! :)Īnd you’re probably asking how we can add extra files to an app in Kubernetes/OpenShift: To add any kind of dynamic or environment-specific file into a container, we can use a ConfigMap. I learned this trick from this awesome blog post on React environment variables by Javaad Patel. When the browser loads the HTML, it will fetch the minified JavaScript for the React app AND an extra JavaScript source file, which contains the environment config. We serve an additional JS file to the browser, which contains these environment-specific variables. Instead of giving environment variables to our “app”, we give the environment variables to the client (the web browser). So what do you do, if you need to give some runtime variables, like the URL to your backend API?ĭynamic variables can be declared in a file, which gets served to the browser separately But with front-end, there is no “runtime” (like Node.js) which can receive env vars.Ī React app is just static code (HTML and JavaScript) that will be hosted on a basic web server. (If you don’t need to configure your React app, you can skip this section!)įor back-end apps, we can usually use environment variables.
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How do you provide configuration to a static web app? How to provide runtime configuration to the React app Now that we’ve defined how we’ll build a container image for the application, the next thing to tackle is how we’ll provide runtime config to the app, like API URLs or environment details. I’m using the free Nginx image from Bitnami. So here’s my Dockerfile, which I added into the root of my Git repository:ĬOPY -from=builder /usr/src/app/build /appīut it basically tells the Docker build to copy the output from Stage 1 into the /app dir in the Stage 2 container.įinally we expose port 8080 and set the startup command for Nginx. The Docker build will run in two stages: Build the app using the node image → Inject the compiled code into an nginx container But if you’ve got an OpenShift subscription, you can use the supported images from the Red Hat registry. In my Docker build I’m going to use images available from public registries.
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Why? Because it gives a bit more flexibility than OpenShift’s Source-to-Image build – it means that you could actually build this image anywhere with Docker, not just inside OpenShift.
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Set up the app How to create a Dockerfile for the React app I’m going to use yarn in this tutorial because that’s the default that you get when you create a new app with create-react-app. If you haven’t got an app, and you want to use an example, then feel free to fork mine here: If you’ve already got a React app you want to deploy, then skip ahead!