servers.com cloud controller manager

The cloud controller manager (CCM) is a Kubernetes component responsible for interaction with external cloud providers by an agreed interface. When a Kubernetes cluster needs to create a resource on the provider's side, CCM triggers the provider's API. CCM is installed automatically on each node of the control plane during the cluster creation.

There are two scenarios that involves the servers.com CCM:

• Node initialization
• Load balancer creation

Node initialization

Node initialization is a process of accepting a node as a part of a Kubernetes cluster. When a server is provisioned on the servers.com side, it's integrated into the cluster with the help of the CCM.

Load balancer creation

When you create a LoadBalancer service, Kubernetes sends a command to the CCM to create an L4 (TCP) load balancer. This load balancer is located outside of the Kubernetes cluster and serves to route traffic to your applications. CCM creates a new load balancer for each service object with the LoadBalancer type.

IP address assignment

The actual creation of the load balancer happens asynchronously, and information about the provisioned balancer and its IP address is pushed back into the ".status.loadBalancer" field of a service object. Once the service object is destroyed, its IP address is returned to the shared pool, and will eventually be assigned to another object.

Billing

A load balancer created via CCM will be billed at its regular price as a standalone service.

Annotations

Annotations manage parameters of a TCP (L4) Load Balancer. They are specified within a Service object.

This is an example of a LoadBalancer service with the proxy protocol annotation:

This is an example of a LoadBalancer service with the proxy protocol annotation:

---
apiVersion: v1
kind: Service
metadata:
  name: hello-world-svc
  annotations:
    servers.com/proxy-protocol: "true"
spec:
  ports:
  - port: 80
    protocol: TCP
    targetPort: 80
  selector:
    app: hello-world-app
  type: LoadBalancer

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