Hands-On Microservices with Kubernetes

Pod identity

StatefulSet pods have a stable identity that includes the following triplet: a stable network identity, an ordinal index, and stable storage. These always go together; the name of each pod is <statefulset name>-<ordinal>.

The headless service associated with the StatefulSet provides the stable network identity. The service DNS name will be as follows:

<service name>.<namespace>.svc.cluster.local

Each pod, X, will have a stable DNS name as follows:

<statefulset name>-<ordinal>.<service name>.<namespace>.svc.cluster.local

For example, the first pod of the user-db StatefulSet will be called the following:

user-db-0.user-db.default.svc.cluster.local

Additionally, StatefulSet pods automatically get assigned a label, as follows: