Shulou(Shulou.com)06/01 Report--

This article will explain in detail how to understand the principle of Service IP. The content of the article is of high quality, so the editor shares it for you as a reference. I hope you will have a certain understanding of the relevant knowledge after reading this article.

Service Cluster IP is a virtual IP that is managed by iptables rules on the Kubernetes node.

You can print out the iptables rules of the current node through the iptables-save command. Because there are so many outputs, only the information related to httpd-svc Cluster IP 10.99.229.179 is intercepted:

The meanings of these two rules are:

If the Pod within the Cluster (the source address is from 10.244.0.0Universe 16) wants to access the httpd-svc, it is allowed.

Other source addresses access the httpd-svc and jump to the regular KUBE-SVC-RL3JAE4GN7VOGDGP.

The KUBE-SVC-RL3JAE4GN7VOGDGP rules are as follows:

Forward the request to each of the three Pod at the back end. Through the above analysis, we come to the following conclusions:

Iptables forwards the traffic accessing the Service to the backend Pod and uses a load balancing policy similar to polling.

It is also important to add that each node of the Cluster is configured with the same iptables rules, which ensures that the entire Cluster can access the Service through Service's Cluster IP.

In addition to directly accessing Service,DNS through Cluster IP is a more convenient way.

On how to understand the principle of Service IP to share here, I hope that the above content can be of some help to you, can learn more knowledge. If you think the article is good, you can share it for more people to see.

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.