This blog post addresses the topic, how to use environment variables to make a containized Quarkus application more flexible. We will touch following technologies Quarkus, OpenJ9 Java runtime, MicroProfile, Dockerfile definition and Code Engine.
When you run a containerized application on a container orchestration platform like Kubernetes, Open Shift or with a serverless framework like Knative or Code Engine or on other platforms, it is helpful to pass endpoints to other applications to the containerized application by using environment variables. When the container will be restarted, these variables can be provided to the container and no adjustment in the source code is necessary. You can use configmaps or in Code Engine simple the environment variable itself.
We will follow along an application example for the implementation and the example source code you find in the Get started to deploy a Java Microservices application to Code Engine workshop. (or the direct link to the used file in the GitHub repository is provided in the blog post itself)Continue reading