What is Kubernetes?
Kubernetes (K8s) is an open-source platform designed for orchestrating containerized workloads and services. It supports declarative configuration and automation while being portable and extensible. Kubernetes boasts a robust ecosystem with extensive community support, tools, and services, making it a go-to choice for managing modern containerized applications.
Using Kubernetes for Sitecore Deployments
With the introduction of Docker images for Sitecore 10, Kubernetes becomes an excellent choice for deploying and managing Sitecore instances. Azure Kubernetes Service (AKS), in particular, is a scalable and flexible platform for hosting these workloads.
Troubleshooting AKS with Sitecore: Common Error
While deploying Sitecore on AKS, you might encounter the following error:
vbnet Copy Edit ERROR: Get https://scr.sitecore.com/v2/: x509: certificate signed by unknown authority
This issue arises because Kubernetes defaults to running workloads on a Linux management cluster, while Sitecore services require a Windows cluster. The mismatch leads to certificate validation failure.
Fix: Specify the Node Selector in Your YAML Config
To resolve this, explicitly direct Kubernetes to use a Windows cluster for Sitecore services by adding the following snippet to your YAML configuration file:
yaml Copy Edit spec: nodeSelector: "beta.kubernetes.io/os": windows
This ensures that Kubernetes launches Sitecore services on Windows nodes, resolving the certificate validation issue.
Steps to Deploy Sitecore on Azure Kubernetes Services:
- Set Up Local Docker Environment
Test the Sitecore Docker images locally to ensure they function correctly before deploying to AKS. - Provision an Azure AKS Instance
Create an Azure Kubernetes cluster with Windows node pools. - Configure YAML Files
Update the YAML configurations for Sitecore services, ensuring the inclusion of the nodeSelector
- directive.
- Upload and Apply Configurations
Deploy the services to AKS by uploading and applying the YAML configurations. - Validate the Deployment
Verify that all Sitecore services are running on the Windows node pool without errors.