Omron NJcontroller

Machine Controller Manager is the leading automation tool for machine management for, and in, Kubernetes. And the best part is that it is open sourced. It is freely (and easily) usable and extensible, and the community more than welcomes contributions.

The cloud initialization script that is introduced into the VMs via the K8s Secret consumed by the MachineClasses talks to the KCM (K8s Controller Manager) and creates the node objects. After registering themselves to the Target Cluster, nodes start sending health signals to the machine objects. That is when MCM updates the status of the machine object from Pending to Running.

Kubermatic machine-controller

MCM is originally developed and employed by a K8s Control Plane as a Service called Gardener. However, the MCM’s design is elegant enough to be employed when managing the machines of any independent K8s clusters, without having to necessarily associate it with Gardener.

Metal-stack is a set of microservices that implements Metal as a Service (MaaS). It enables you to turn your hardware into elastic cloud infrastructure. Metal-stack employs the adopted Machine Controller Manager to their Metal API. Check out an introduction to it in metal-stack - kubernetes on bare metal.

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Machine Controllerjobs

If you want to know more about Machine Controller Manager or find out about a similar scope for your solutions, feel free to visit the GitHub page machine-controller-manager. We are so excited to see what you achieve with Machine Controller Manager.

Also, other interesting use cases with MCM are implemented by Kubernetes enthusiasts, who for example adjusted the Machine Controller Manager to provision machines in the cloud to extend a local Raspberry-Pi K3s cluster. This topic is covered in detail in the 2020-07-03 Gardener Community Meeting on our Gardener Project YouTube channel.

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Omron NX controllers

MCM supports declarative management of machines in a K8s Cluster on various cloud providers like AWS, Azure, GCP, AliCloud, OpenStack, Metal-stack, Packet, KubeVirt, VMWare, Yandex. It can, of course, be easily extended to support other cloud providers.

Watch the Out of Tree Machine Controller Manager video on our Gardener Project YouTube channel to understand more about OOT MCM.

Sky UK Limited (a broadcaster) migrated their Kubernetes node management from Ansible to Machine Controller Manager. Check out the How Sky is using Machine Controller Manager (MCM) and autoscaler video on our Gardener Project YouTube channel.

Moog ParisonControllerManual

Kubernetes is a cloud-native enabler built around the principles for a resilient, manageable, observable, highly automated, loosely coupled system. We know that Kubernetes is infrastructure agnostic with the help of a provider specific Cloud Controller Manager. But Kubernetes has explicitly externalized the management of the nodes. Once they appear - correctly configured - in the cluster, Kubernetes can use them. If nodes fail, Kubernetes can’t do anything about it, external tooling is required. But every tool, every provider is different. So, why not elevate node management to a first class Kubernetes citizen? Why not create a Kubernetes native resource that manages machines just like pods? Such an approach is brought to you by the Machine Controller Manager (aka MCM), which, of course, is an open sourced project. MCM gives you the following benefits:

Machine Controller Manager is a group of cooperative controllers that manage the lifecycle of the worker machines. It is inspired by the design of Kube Controller Manager in which various sub controllers manage their respective Kubernetes Clients.

OmronController

The Custom Resources MachineDeployment, MachineSet and Machines are very much analogous to the native K8s resources of Deployment, ReplicaSet and Pods respectively. So, in the context of MCM:

Moog servoController

A lot of contributions are already being made towards an OOT Machine Controller Manager for various cloud providers. Below are the links to the repositories:

This OOT Machine Controller will implement a common interface to manage the VMs on the respective cloud provider. Now, while the Machine Controller deals with the Machine objects, the Machine Controller Manager (MCM) deals with higher level objects such as the MachineSet and MachineDeployment objects.

MoogController

In MCM, there are two K8s clusters in the scope — a Control Cluster and a Target Cluster. The Control Cluster is the K8s cluster where the MCM is installed to manage the machine lifecycle of the Target Cluster. In other words, the Control Cluster is the one where the machine-* objects are stored. The Target Cluster is where all the node objects are registered. These clusters can be two distinct clusters or the same cluster, whichever fits.

Machine Controller Manager reconciles a set of Custom Resources namely MachineDeployment, MachineSet and Machines which are managed & monitored by their controllers MachineDeployment Controller, MachineSet Controller, Machine Controller respectively along with another cooperative controller called the Safety Controller.

When a MachineDeployment object is created, the MachineDeployment Controller creates the corresponding MachineSet object. The MachineSet Controller in-turn creates the Machine objects. The Machine Controller then talks to the cloud provider API and actually creates the VMs on the cloud.

Going ahead, having the implementation of the Machine Controller Manager supporting too many cloud providers would be too much upkeep from both a development and a maintenance point of view. Which is why the Machine Controller component of MCM has been moved to Out-of-Tree design, where the Machine Controller for each respective cloud provider runs as an independent executable, even though typically packaged under the same deployment.