What is the baremetal operator?
The bare metal operator is documented at https://github.com/metal3-io/baremetal-operator/blob/master/docs/api.md and it’s the operator in charge of definitions of physical hosts, containing information about how to reach the Out of Band management controller, URL of image to provision, plus other properties related with hosts being used for provisioning instances.
What is IPMI?
IPMI is the acronym for
Intelligent Platform Management Interface which is used to monitor hardware health (fans, voltage, temperature, etc). Specification is available at https://www.intel.com/content/www/us/en/products/docs/servers/ipmi/ipmi-home.html and was created by a joint effort by several manufactures. It allows to also define boot order and power status of the hardware.
What is out-of-band management controller?
Enterprise hardware usually have an integrated or optional controller that allows to reach the server even if it’s powered down, either via dedicated or shared nic. This controller allows some checks on the server hardware and also perform some settings like changing power status, changing Boot Order, etc. The Baremetal Operator uses it to power on, reboot and provision the physical servers to be used for running workloads on top. Commercial names include
iRMC, etc and most of them should support
What is an operator?
An Operator is a method of packaging, deploying and managing a Kubernetes application. A Kubernetes application is an application that is both deployed on Kubernetes and managed using the Kubernetes APIs and kubectl tooling. You can think of Operators as the runtime that manages this type of application on Kubernetes. If you want to learn more about Operators you can check the CoreOS Operators website https://coreos.com/operators/