We’ll use Docker Hub because it’s the default. A Docker registry to store the container images.Istio is a service mesh that adds many features to Kubernetes. A Kubernetes cluster running with Istio.That being said, we’ll need to define some common ground. However, the commands used to connect to the Kubernetes cluster will change. Technically, Kubernetes’ behavior itself doesn’t depend on the provider, so this guide should work the same for any application on Google Cloud, AWS, Azure, or any other cloud. I’ll try to avoid going into cloud vendor-specific details. In this tutorial, I’m going to show you how to use Semaphore Continuous Integration (CI) and Continuous Delivery (CD) to test and release any project. Even so, we should strive to automate the release cycle as much as possible. Fortunately, Kubernetes makes things a lot easier. We have to grapple with two deployments at once and manage the network. In Kubernetes, we run applications with deployments and pods.Īs you can imagine, blue-green deployments are complex. Imagine we have version v1 of awesome application called myapp, and that is currently running in blue. Let’s see Kubernetes blue-green deployments in action. It is a great way to get started with Docker and Kubernetes. If you are an absolute beginner in Kubernetes or if you’d like a refresher, grab a copy of our free eBook CI/CD with Docker and Kubernetes. Kubernetes lets us manage the whole blue-green process using one tool. We can, for instance, use the platform to dynamically create the green environment, deploy the application, switch over the user’s traffic, and finally delete the blue environment. Kubernetes is an orchestration platform that’s perfect for blue-green deployments. Here is where Kubernetes enters the picture. Once users have been switched to the new version, the old environment can be torn down. For instance, we can start virtual machines and spin up containers, configure networks and services before we start the deployment. In practice, however, it’s a lot more common and cost-effective to provision resources on-demand in the cloud using infrastructure as code (IaC). If we’re using bare metal servers, one system will be idle most of the time. The way we manage the infrastructure around blue-green deployments depends on the technology we’re running.
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