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peerpodconfig-ctrl

README.md

peerpodconfig-ctrl

peerpodconfig-ctrl is a kubernetes controller which is responsible for watching the PeerPodConfig CRD object and manages the creation and deletion lifecycle of all required components to run peer pods.

Description

This controller can be run standalone or imported into existing operators. It comes with a CRD called PeerPodConfig that it's watching. By creating an instance of PeerPodConfig the deployment of cloud-api-adaptor daemonset and the webhook is triggered, extended resources are advertised by updating the node capacity fields.

PeerPodConfig CRD

The PeerPodConfig let's the user specify the number of peer pod vms that can be deployed. It is spread as evenly as possible across the number of nodes.

Integrate with your operator

Running the peerpodconfig-ctrl as another controller embedded into an operator can be easily done. Import the controller into your operators main.go and start it.

For an operator-sdk generated operator it could be as simple as:

    import (
        ...
        peerpodcontrollers "github.com/confidential-containers/cloud-api-adaptor/src/peerpodconfig-ctrl/controllers"
        peerpodconfig "github.com/confidential-containers/cloud-api-adaptor/src/peerpodconfig-ctrl/api/v1alpha1"
        ...
    )

    func init() {
        ...
        utilruntime.Must(peerpodconfig.AddToScheme(scheme))
        ...
    }

    func main() {
	...
        if err = (&peerpodcontrollers.PeerPodConfigReconciler{
        	Client: mgr.GetClient(),
        	Log:    ctrl.Log.WithName("controllers").WithName("RemotePodConfig"),
        	Scheme: mgr.GetScheme(),
        }).SetupWithManager(mgr); err != nil {
        	setupLog.Error(err, "unable to create RemotePodConfig controller for OpenShift cluster", "controller", "RemotePodConfig")
        	os.Exit(1)
        }
        ...
    }

Getting Started

Please note that while it is possible to run the controller standalone it is not the intended use case.

You’ll need a Kubernetes cluster to run against. You can use KIND to get a local cluster for testing, or run against a remote cluster. Note: Your controller will automatically use the current context in your kubeconfig file (i.e. whatever cluster kubectl cluster-info shows).

Running on the cluster

  1. Install Instances of Custom Resources:
kubectl apply -f config/samples/
  1. Build and push your image to the location specified by IMG:
make docker-build docker-push IMG=<some-registry>/peerpodconfig-ctrl:tag
  1. Deploy the controller to the cluster with the image specified by IMG:
make deploy IMG=<some-registry>/peerpodconfig-ctrl:tag

Uninstall CRDs

To delete the CRDs from the cluster:

make uninstall

Undeploy controller

UnDeploy the controller to the cluster:

make undeploy

Contributing

// TODO(user): Add detailed information on how you would like others to contribute to this project

How it works

This project aims to follow the Kubernetes Operator pattern

It uses Controllers which provides a reconcile function responsible for synchronizing resources until the desired state is reached on the cluster

Test It Out

  1. Install the CRDs into the cluster:
make install
  1. Run your controller (this will run in the foreground, so switch to a new terminal if you want to leave it running):
make run

NOTE: You can also run this in one step by running: make install run

Modifying the API definitions

If you are editing the API definitions, generate the manifests such as CRs or CRDs using:

make manifests

NOTE: Run make --help for more information on all potential make targets

More information can be found via the Kubebuilder Documentation

License

Copyright 2022.

Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.