“This is the 19th day of my participation in the Gwen Challenge in November. Check out the details: The Last Gwen Challenge in 2021”

Number of nodes and pods supported by the K8S

K8s has also evolved over time. Take a look at the number of nodes and pods supported before and now

A node is a node. Earlier versions of k8S supported 100 nodes. Now k8S can support up to 2000 nodes

The k8S supports up to 150,000 pods, up from 1000 in earlier versions

K8s application deployment architecture

Application deployment architectures are classified into two types: non-central node architecture and central node architecture

  • What is a node-less architecture?

This is where all hosts in a cluster are partners, such as GlusterFS distributed storage

  • What is a central node architecture?

For example, HDFS is a central node architecture with NameNode (managers of the entire cluster) and DataNode (storage data of the cluster).

Now K8S is also a central node architecture

As can be seen from the figure above, K8S has one master node and two worker nodes

The worker node can communicate with the master node respectively

K8s Cluster architecture node roles and functions

master node

  • It is the main control node of a cluster. It can manage and schedule the cluster and accept users outside the cluster to perform cluster related operations
  • composition
    • API Server
    • Scheduler
    • Cluster State Store
    • Controller Mananger Server

worker node

  • It is a working node of a cluster and a container for running user service applications
  • composition
    • kubelet
    • kubeproxy
    • Container Runtime

As can be seen from the picture above,

The four modules in the master node and the other three modules all communicate with the API server

Apiserver communicates with multiple Woroker nodes

There are containers, networks, and kubelet in multiple Worker nodes

K8S cluster deployment tools, K8S deployment methods, and how to verify the availability of K8S cluster to share

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