GKE on-prem is hybrid cloud software that brings Google Kubernetes Engine (GKE) to on-premises data centers. With GKE on-prem, you can create, manage, and upgrade Kubernetes clusters in your on-premises environment.
GKE on-prem runs in your data center in a vSphere 6.5 or 6.7 Update 3 environment. vSphere is VMware's server virtualization software. GKE on-prem uses VMware's vCenter Server to manage your clusters.
Getting GKE on-prem
GKE on-prem is a core component of GKE Enterprise.
Installing GKE on-prem
Before you install GKE on-prem, you create an admin workstation virtual machine (VM) instance in your vSphere environment. You then use the admin workstation to install GKE on-prem.
GKE on-prem includes an admin cluster and one or more user clusters, as well as an admin workstation VM. All of these VMs run in a single vSphere cluster.
The admin cluster is the base layer of GKE on-prem. It runs the following GKE on-prem components:
Admin control plane. The admin control plane includes the Kubernetes API server, the scheduler, and several controllers for the admin cluster. The machine that runs the admin control plane is called the admin master.
User control planes. For each user cluster, the admin cluster has a node that runs the control plane for the user cluster. The control plane includes the Kubernetes API server, the scheduler, and several controllers for the user cluster. A machine that runs a user control plane is called a user master.
Add-ons. The admin cluster runs several Kubernetes add-ons, like Grafana, Prometheus, and Google Cloud's operations suite. Add-ons run on one or more VMs that are separate from the VMs that run the control planes.
Note that user control planes are managed by the admin cluster. They run on nodes in the admin cluster, not in the user clusters. In addition, nodes in the admin cluster run GKE on-prem components. User workloads do not run in the admin cluster.
User clusters are where you deploy and run your containerized workloads and services.
To learn about GKE on-prem versions, see Versions.