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Kubernetes - Getting Started with the Cloud Controller Manager

Reviewed on 10 May 2021Published on 19 March 2020
  • compute
  • kubernetes
  • Kubernetes-cluster
  • kubeadm
  • cloud-controller-manager

Cloud Contoller Manager Overview

A Cloud Controller Manager is a daemon that embeds cloud-specific control loops. It can be used to deploy resources in the Scaleway Elements ecosystem.

Currently the scaleway-cloud-controller-manager implements:

  • Instances interface: updates nodes with cloud provider specific labels and addresses, also deletes kubernetes nodes when deleted from the cloud-provider.
  • LoadBalancer interface: responsible for creating load balancers when a service of type: LoadBalancer is created in Kubernetes.
  • Zone interface: makes Kubernetes aware of the failure domain of each node.

The Scaleway Cloud Controller Manager is currently under active development and released as open-source project on GitHub.


Creating a Kubernetes Cluster using kubeadm on Scaleway Elements

The goal of this step is to create a Kubernetes cluster using kubeadm on Scaleway Elements Instances.

For the purpose on this example, it is required to create three Ubuntu Bionic Instances:

  • master1
  • node1
  • node2
  1. Prepare the Instances by runnisng the following commands on each of them:

    apt-get update && apt-get install -y \
    iptables \
    arptables \
    ebtables \
    apt-transport-https \
    ca-certificates \
    curl \
    gnupg-agent \
    curl -s | apt-key add -
    add-apt-repository \
    "deb [arch=amd64] kubernetes-xenial main"
    curl -fsSL | apt-key add -
    add-apt-repository \
    "deb [arch=amd64] \
    $(lsb_release -cs) \
    apt-get update && apt-get install -y \
    docker-ce docker-ce-cli kubelet kubeadm kubectl
    apt-mark hold \
    docker-ce docker-ce-cli kubelet kubeadm kubectl
    echo KUBELET_EXTRA_ARGS=\"--cloud-provider=external\" > /etc/default/kubelet
  2. Initalize the Kubernetes master on the instance master1:

    root@master1:~# kubeadm init --control-plane-endpoint=$(scw-metadata PUBLIC_IP_ADDRESS) --apiserver-cert-extra-sans=$(scw-metadata PUBLIC_IP_ADDRESS)
    root@master1:~# mkdir -p ~/.kube
    root@master1:~# cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
    root@master1:~# chown $(id -u):$(id -g) $HOME/.kube/config
    root@master1:~# kubectl apply -f
  3. During the installation the kubeadm join command displays. Note it down as it is required for the worker nodes to join the cluster. You can also copy the kubeconfig file and save it on your local computer.

  4. Execute the kubeadm join command on your on each of the worker nodes to join the cluster:

    root@node1:~# kubeadm join --token itvo0b.kwoao79ptlj22gno \
    --discovery-token-ca-cert-hash sha256:07bc3f9601f1659771a7a6fd696c2969cbc757b088ec752ba95d5a42c06ed91f
  5. Verify the status of the cluster on the master by running the kubectl get nodes command.

    root@master1:~#  kubectl get nodes
    master1 Ready master 18m v1.17.4
    node1 Ready <none> 8m38s v1.17.4
    node2 Ready <none> 2m31s v1.17.4

    The cluster is ready and working. Continue by deploying the cloud-controller-manager.

Deploying the cloud-controller-manager on the Cluster

To deploy the cloud-controller-manager the following information are required:

  • Your access key.
  • Your secret key.
  • Your organization id.
  • The Scaleway region.

You can find this information in the Scaleway Console.

  1. Create a k8s-scaleway-secret.yml containing the follwing information:

    root@master1:~#  nano k8s-scaleway-secret.yml
    apiVersion: v1
    kind: Secret
    name: scaleway-secret
    namespace: kube-system
    SCW_ACCESS_KEY: 'xxxxxxxxxxxxxxxx'
    SCW_SECRET_KEY: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx'
    SCW_DEFAULT_REGION: 'fr-par'
    SCW_DEFAULT_ORGANIZATION_ID: 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx'
  2. Create the secret and deploy the controller

    root@master1:~# kubectl create -f k8s-scaleway-secret.yml
    root@master1:~# kubectl apply -f

Checking that the cloud-controller-manager is working

  1. Verify the cloud-controller-manager is running from the master1 instance:

    root@master1:~# kubectl get pods -n kube-system -l app=scaleway-cloud-controller-manager
    scaleway-cloud-controller-manager-584558b994-rln4j 1/1 Running 0 12s
    root@master1:~# kubectl get nodes
    master1 Ready master 18m v1.17.4
    node1 Ready <none> 8m38s v1.17.4
    node2 Ready <none> 2m31s v1.17.4
  2. Deploy a LoadBalancer service and verify a public ip is assigned to this service. The service will automatically create a managed Load Balancer on the Scaleway Elements platform.

    Create a lb.yml file that contains the following information:

    root@master1:~# nano lb.yml
    apiVersion: v1
    kind: Service
    name: example-service
    app: example
    - port: 8765
    targetPort: 9376
    type: LoadBalancer
  3. Create the service from the configuration file:

    root@master1:~# kubectl create -f lb.yml
  4. Verify if the service has been created:

    root@master1:~# kubectl get services
    example-service LoadBalancer 8765:30175/TCP 7s
    kubernetes ClusterIP <none> 443/TCP 21m

The LoadBalancer service with the internal IP and external IP has been created. You have sucessfully deployed a cluster with kubeadm and the scaleway-cloud-controlle-manager. For more information about the Scaleway Cloud Controller Manager, follow the project on GitHub.