Out of tree (controller based) implementation for ironcore as a new provider.

• The ironcore Out Of Tree provider implements the interface defined at MCM OOT driver.

Following are the basic principles kept in mind while developing the external plugin.

• Communication between this Machine Controller (MC) and Machine Controller Manager (MCM) is achieved using the Kubernetes native declarative approach.
• Machine Controller (MC) behaves as the controller used to interact with the cloud provider ironcore and manage the resources corresponding to the machine objects.
• Machine Controller Manager (MCM) deals with higher level objects such as machine-set and machine-deployment objects.

• Steps to be followed while implementing/testing a new provider are mentioned here

1. Open terminal pointing to $GOPATH/src/github.com/gardener. Clone this repository.

2. Navigate to $GOPATH/src/github.com/ironcore-dev/machine-controller-manager-provider-ironcore.

   • In the MAKEFILE make sure $TARGET_KUBECONFIG points to the cluster where you wish to manage machines. $CONTROL_NAMESPACE represents the namespaces where MCM is looking for machine CR objects, and $CONTROL_KUBECONFIG points to the cluster which holds these machine CRs.
   • Run the machine controller (driver) using the command below.

     make start

3. On the second terminal pointing to $GOPATH/src/github.com/gardener,

   • Clone the latest MCM code

     git clone [email protected]:gardener/machine-controller-manager.git

   • Navigate to the newly created directory.

     cd machine-controller-manager

   • Deploy the required CRDs from the machine-controller-manager repo,

     kubectl apply -f kubernetes/crds.yaml

   • Run the machine-controller-manager in the cmi-client branch

     make start

4. On the third terminal pointing to $GOPATH/src/github.com/gardener/machine-controller-manager-provider-ironcore

   • Fill in the object files given below and deploy them as described below.
   • Deploy the machine-class

     kubectl apply -f kubernetes/machine-class.yaml

   • Deploy the kubernetes secret if required.

     kubectl apply -f kubernetes/secret.yaml

   • Deploy the machine object and make sure it joins the cluster successfully.

     kubectl apply -f kubernetes/machine.yaml

   • Once machine joins, you can test by deploying a machine-deployment.
   • Deploy the machine-deployment object and make sure it joins the cluster successfully.

     kubectl apply -f kubernetes/machine-deployment.yaml

   • Make sure to delete both the machine and machine-deployment object after use.

     kubectl delete -f kubernetes/machine.yaml
     kubectl delete -f kubernetes/machine-deployment.yaml