machine-controller-manager-provider-virtual

A virtual provider for the Gardener Machine Controller Manager thar provides a Driver implementation that creates virtual k8s Nodes in a virtual shoot cluster. It can mimic AWS/GCP/Azure Nodes depending on the MachineClass. At the moment only AWS is supported. A helper CLI tool dev is also provided to setup and then start services: KVCL (virtual cluster: api-server, etcd, kube-scheduler), MCM (machine-controller-manager), CA (cluster-autoscaler) as well as MC (this virtual machine-controller)

Purpose

To enable dev-testing and debugging of the MCM and the CA on your local box with low resource usage and very simple setup. No Docker Desktop, no Kind, no complexity - just plain OS processes who write their logs to the /tmp directory.
To enable integration tests to execute and validate PR submissions on the core machine-controller-manager repository.

Usage

Setup

[!NOTE] Make sure you are signed into the SAP network before executing setup!

Checkout Pre-requisite projects (for Local, Manual Execution)

KVCL (kubernetes virtual cluster). Checkout https://github.com/unmarshall/kvcl/ into your GOPATH. Ex: into $GOPATH/src/github.com/unmarshall/kvcl
Autoscaler (gardener autoscaler). Checkout https://github.com/gardener/autoscaler/ into $GOPATH/src/k8s.io/autoscaler.
MCM (machine-controller-manager). Checkout https://github.com/gardener/machine-controller-manager/ into $GOPATH/src/github.com/elankath/machine-controller-manager

Build the dev tool

Change to the project base directory
Execute: go build -v -o bin/dev cmd/dev/main.go

Execute Dev Setup

(optional) Clear the gen directory if you want a fresh setup: rm -rf gen/
Execute: ./bin/dev setup -h to view command help
Execute: ./bin/dev setup -project <gardenerProjName> -shoot <gardenerShootName>

Dev Setup Help

➤ ./bin/dev setup -h                                                                                                                 git:main*
Usage of setup:
  -ca-dir string
    	CA Project Dir - fallback to env CA_DIR (default "/Users/I034796/go/src/k8s.io/autoscaler/cluster-autoscaler")
  -kvcl-dir string
    	KVCL Project Dir - fallback to env KVCL_DIR (default "/Users/I034796/go/src/github.com/unmarshall/kvcl")
  -landscape string
    	SAP Gardener Landscape - fallback to env LANDSCAPE (default "sap-landscape-dev")
  -mcm-dir string
    	MCM Project Dir - fallback to env MCM_DIR (default "/Users/I034796/go/src/github.com/gardener/machine-controller-manager")
  -project string
    	Gardener Project - fallback to env PROJECT
  -shoot string
    	Gardener Shoot Name - fallback to env SHOOT
  -skip-build
    	Skips building binaries if already present

What does 'dev setup' do ?

Will download/build the binaries for the virtual cluster, MCM, MC, CA etc
It also downloads MachineClass, MachineDeployment, Secrets of the machine class and other resources from a real world Gardener cluster specified by the -lanscape, -project and -shoot options.
The idea is to set up things in such a way that the MCM, MC and CA components can use the configuration of a remote gardener cluster replicated on a local virtual cluster.
NOTE: GENERATES StartConfig inside gen/start-config.json.
1. KINDLY EDIT this file to customize local startup options of gardener MCM (machine-controller-manager), MC (virtual machine-controller) and CA (cluster-autoscaler)

Dev Start

Execute: ./bin/dev start -h to view command help

Dev Start Help

Usage of start:
  -all
    	Starts ALL services
  -ca
    	Start CA (gardener cluster-autoscaler)
  -mc
    	Start MC (virtual machine-controller)
  -mcm
    	Start MCM (gardener machine-controller-manager)

NOTE: "start" with no specified option starts ONLY KVCL (virtual-cluster)

Launch All Services

Execute: ./bin/dev start -all #launches KVCL, MCM, MC and CA

Launch Only KVCL

Execute: ./bin/dev start

Launch KVCL and MCM

Execute: ./bin/dev start -mcm

Launch KVCL, MCM and MC

Execute: ./bin/dev start -mcm -mc

Launch KVCL, MCM, MC and CA

Execute: ./bin/dev start -mcm -mc -ca

Dev Status

Execute: ./bin/dev status -h to view command help

Dev Status Help

Usage of status:
  -all
    	check status of ALL services
  -ca
    	check status CA (gardener cluster-autoscaler)
  -mc
    	check status MC (virtual machine-controller)
  -mcm
    	check status MCM (gardener machine-controller-manager)

NOTE: "status" with no  option specified checks status of only kvcl (virtual-cluster)

Examples

Checking out cluster resources

source gen/env # Sources generated env variables such as KUBECONFIG and SHOOT_NAMESPACE
Listing control plane objects
1. kubectl config set-context --current --namespace=<SHOOT_NAMESPACE>
2. kubectl get mcc,mcd,mc

NAME                                                             AGE
machineclass.machine.sapcloud.io/shoot--i034796--aw-a-z1-ccb6a   11m
machineclass.machine.sapcloud.io/shoot--i034796--aw-b-z1-44b8a   11m
machineclass.machine.sapcloud.io/shoot--i034796--aw-c-z1-c7d6c   11m

NAME                                                            READY   DESIRED   UP-TO-DATE   AVAILABLE   AGE
machinedeployment.machine.sapcloud.io/shoot--i034796--aw-a-z1   1       1         1            1           11m
machinedeployment.machine.sapcloud.io/shoot--i034796--aw-b-z1                                              11m
machinedeployment.machine.sapcloud.io/shoot--i034796--aw-c-z1                                              11m

NAME                                                              STATUS    AGE   NODE
machine.machine.sapcloud.io/shoot--i034796--aw-a-z1-c9478-99wwq   Running   11m   shoot--i034796--aw-a-z1-c9478-99wwq

Listing data plane objects
1. kubectl get no

Design

TODO

# README