Harvester, created by Rancher, is open source HCI software built using Kubernetes.
While Kubernetes has become the defacto standard for container orchestration, it may seem like an odd choice as the foundation for managing VMs. However, when you think of Kubernetes as an extensible orchestration platform, this choice makes sense.
Kubernetes provides authentication, authorization, high availability, fault tolerance, CLIs, software development kits (SDKs), application programming interfaces (APIs), declarative state, node management, and flexible resource definitions. All of these features have been battle tested over the years with many large-scale clusters.
More importantly, Kubernetes orchestrates many kinds of resources beyond containers. Thanks to the use of custom resource definitions (CRDs), and custom operators, Kubernetes can describe and provision any kind of resource.
By building on Kubernetes, Harvester takes advantage of a well tested and actively developed platform. With the use of KubeVirt and Longhorn, Harvester extends Kubernetes to allow the management of bare metal servers and VMs.
function getElementByXpath(path) {
return document.evaluate(path, document, null, XPathResult.FIRST_ORDERED_NODE_TYPE, null).singleNodeValue;
};function getElementsByXpath(xpath, parent)
{
let results = [];
let query = document.evaluate(xpath, parent || document,
null, XPathResult.ORDERED_NODE_SNAPSHOT_TYPE, null);
for (let i = 0, length = query.snapshotLength; i < length; ++i) {
results.push(query.snapshotItem(i));
}
return results;
}