Cluster Overview

Cluster Network

A cluster network can be divided into three network types:

• Node network: IP addresses are assigned to nodes in a cluster.
• Container network: IP addresses are assigned to containers in a cluster for communication. Currently, multiple container network models are supported, and each model has its own working mechanism.
• Service network: A Service is a Kubernetes object used to access containers. Each Service has a static IP address.

When you create a cluster, select a proper CIDR block for each network. Ensure that the CIDR blocks do not conflict with each other and have sufficient available IP addresses. You cannot change the container network model after the cluster is created. Plan the container network model properly in advance.

You are advised to learn about the cluster network and container network models before creating a cluster. For details, see Container Network.

Number of Master Nodes in a Cluster and Cluster Scale

In a CCE cluster, the number of master nodes does not determine the cluster scale. These are two different aspects of the cluster.

• Master nodes: When creating a cluster on CCE, you have the option to choose one or three master nodes. If you choose three master nodes, the cluster will have high availability.
• Cluster scale: refers to the maximum number of worker nodes that can be managed by a cluster. For example, you can choose a cluster management scale of 50 or 200 nodes when creating the cluster. The flavors of the master nodes are influenced by the cluster scale. Higher cluster scales require higher flavors of the master nodes.

  It is possible to change the cluster scale after creating the cluster. However, you can only increase the scale and cannot decrease it. For details, see Changing a Cluster Scale.

Cluster Lifecycle