ASP.NET Core is a popular open-source web development framework developed by Microsoft. It allows developers to build modern and scalable web applications that can run on multiple platforms, including Kubernetes (K8S). Kubernetes is a container orchestration platform that enables easy deployment and management of containerized applications.

In this blog post, we will explore how to perform a rolling update of an ASP.NET Core application on Kubernetes. A rolling update is a deployment strategy where updates are applied gradually to the running instances, minimizing downtime and ensuring high availability.

Prerequisites

Before we get started, make sure you have the following prerequisites in place:

1. A Kubernetes cluster is up and running.
2. Kubectl command-line tool is installed.
3. Docker is installed for building and pushing container images.
4. An ASP.NET Core application ready for deployment.

Step 1: Build and Push Docker Image

The first step is to build and push a Docker image of your ASP.NET Core application to a container registry. Make sure your application’s Dockerfile is set up correctly. Once the image is built, push it to a container registry that Kubernetes can access.

Step 2: Create Kubernetes Deployment

Next, you need to create a Kubernetes Deployment manifest file. This file describes the desired state of your application on the Kubernetes cluster. Specify the image name and tag, the number of replicas, and any additional configuration settings.

Step 3: Deploy the Application

After creating the Deployment manifest, use kubectl to deploy the ASP.NET Core application to the Kubernetes cluster by running the following command:

kubectl apply -f deployment.yaml

Verify that the Deployment is running correctly by executing:

kubectl get deployments
kubectl describe deployment <deployment-name>

Step 4: Perform Rolling Update

To perform a rolling update, you need to update the image tag in the Deployment manifest file to the new version of your ASP.NET Core application. Save the changes and apply them to the Kubernetes cluster using the following command:

kubectl apply -f deployment.yaml

Kubernetes will automatically detect the changes and start rolling out the new version. It will gradually terminate the old instances and replace them with the new ones, ensuring that the application remains available during the update process.

To monitor the progress of the rolling update, use the following command:

kubectl rollout status deployment <deployment-name>

Step 5: Verify the Update

Once the rolling update is complete, verify that the new version of your ASP.NET Core application is running successfully. You can access the application using its service URL or by exposing it through a Kubernetes Ingress.

Conclusion

Rolling updates in Kubernetes provide a seamless way to update and deploy new versions of your ASP.NET Core application. By gradually updating the instances, you can minimize downtime and ensure the high availability of your application. Follow the steps outlined in this blog post to perform a rolling update of your ASP.NET Core application on Kubernetes.

本文来自极简博客，作者：星空下的约定，转载请注明原文链接：ASP.NET Core on K8S Rolling Update