In this section, we’ll describe the relevant modules of the Terraform template to be used to create the cluster.
![what is kubernetes in azure what is kubernetes in azure](https://miro.medium.com/max/2048/0*OxED9Pu3m5inVnKx.png)
The values that change across deployments can be defined as variables and are either provided through a variables file or during runtime when the Terraform templates are applied. For a more in-depth understanding of Terraform syntax, refer to the Terraform documentation. To create the templates, Terraform uses HashiCorp Configuration Language (HCL), as it is designed to be both machine friendly and human readable. Refer to Microsoft’s guide to get started with Terraform in Azure Cloud Shell.
WHAT IS KUBERNETES IN AZURE CODE
You can use your favorite text editor like vim or use the code editor in Azure Cloud Shell to write the Terraform templates. Terraform usage from Cloud Shell: Azure Cloud Shell has Terraform installed by default in the bash environment. Microsoft offers a step-by-step guide for creating these Azure AD applications.
![what is kubernetes in azure what is kubernetes in azure](https://docs.microsoft.com/zh-tw/hybrid/app-solutions/media/pattern-highly-available-kubernetes/application-architecture.png)
The server application serves as the endpoint for identity requests, while the client application is used for authentication when users try to access the AKS cluster via the kubectl command. Two Azure AD applications are required to enable this: a server application and a client application. Restricted permissions may lead to deployment failures.Īzure AD server and client application: OpenID Connect is used to integrate Azure Active Directory with the AKS cluster. During deployment, an additional resource group is created for the AKS nodes. Deployment prerequisitesįollowing are the prerequisites for the deployment of the AKS cluster:Īzure subscription access: It is recommended that users with contributor rights run the Terraform scripts. While Azure network policies are supported only in Azure CNI, Calico is supported in both Kubenet- and Azure CNI-based network implementations. Customers can also choose between two types of network policies: Azure (native) or Calico network policies (open source). Network policies can be used to define a set of rules that allow or deny traffic between pods based on matching labels.ĪKS supports two types of network implementations: Kubenet (basic networking) and Azure CNI (advanced networking). This can be achieved by implementing network policies in a Kubernetes cluster. However, in production, customers would want to restrict this traffic for security reasons. In case of a data center failure, the workloads deployed in the cluster would continue to run from nodes in a different zone, thereby protecting them from such incidents.įigure 1: High-level AKS authentication flow integrated with Azure AD Pod traffic control through network policy implementationīy default, all pods in an AKS cluster can communicate with each other without any restrictions. Azure availability zones protect resources from data center-level failures by distributing them across one or more data centers in an Azure region.ĪKS clusters can also be deployed in availability zones, in which the nodes are deployed across different zones in a region. AKS deployment across multilpe availability zonesĮnsuring high availability of deployments is a must for enterprise workloads. Let’s take a look at the key AKS features we’ll be covering in this article. It also supports advanced AKS configurations, such as availability zones, Azure AD integration, and network policies for Kubernetes. Terraform enables you to safely and predictably create, change, and improve infrastructure. The AKS cluster deployment can be fully automated using Terraform.
![what is kubernetes in azure what is kubernetes in azure](https://miro.medium.com/max/962/1*2WHIbwc-NX9uATWKmEaJGA.png)
The cluster control plane is deployed and managed by Microsoft while the node and node pools where the applications are deployed, are handled by the customer. It allows customers to focus on application development and deployment, rather than the nitty gritties of Kubernetes cluster management. Azure Kubernetes Service (AKS) is a managed Kubernetes offering in Azure which lets you quickly deploy a production ready Kubernetes cluster.