What Is a Headless Service When I Create a StatefulSet?
The inter-pod discovery service of CCE corresponds to the headless Service of Kubernetes. Headless Services specify None for the cluster IP (spec:clusterIP), which means no cluster IP is allocated.
The working principle of a ClusterIP Service is as follows:
One Service may be backed by multiple endpoints (pods). A client accesses the cluster IP address and the request is forwarded to the real server based on the iptables rules to implement load balancing. For example, a Service is backed by two endpoints, but only the Service address is returned during DNS query. iptables determines the real server accessed by the client. However, when a headless Service is accessed, two actual endpoint records (pod IP addresses) are returned.
Therefore, the headless Service points directly to each endpoint, that is, each pod has a DNS domain name. In this way, pods can access each other, achieving inter-pod discovery and access.
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