Nodes

MetaKube manages the lifecycle of your cluster's Nodes.

There are no dedicated "control plane" nodes, since the control plane is managed by MetaKube in SysEleven infrastructure.
Only the Kubernetes API is accessible.

Terminology

The term "Node" is convoluted and often used for different kinds of things.
To be precise, this is why we distinguish between different concepts.

Node

A Node is the Kubernetes resource that represents Kubernetes' logical concept of a server hosting Pods.

In MetaKube, Nodes are backed by OpenStack servers in an OpenStack network.
A Node object is created when Kubelet first registers it with the Kubernetes API.

MachineDeployment

A MachineDeployment is a logical abstraction of a group of Kubernetes Nodes in the cluster.

It's used to control rolling updates.
It's comparable to a Kubernetes Deployment, only in regard to Nodes instead Pods.

MachineSet

MachineSets represent a set of Kubernetes Nodes with the same configuration.

MachineSets are owned by a MachineDeployment
They are gradually scaled up or down in rolling updates.
They're comparable to ReplicaSet.

Machine

A Machine represents the "physical" server underlying a specific Kubernetes Node.

Machines are immutable
Machines (and their respective Nodes) are replaced during rolling updates.