第 4 章 DNS Operator in OpenShift Container Platform
The DNS Operator deploys and manages CoreDNS to provide a name resolution service to pods, enabling DNS-based Kubernetes Service discovery in OpenShift.
4.1. DNS Operator
The DNS Operator implements the dns API from the operator.openshift.io API group. The Operator deploys CoreDNS using a daemon set, creates a service for the daemon set, and configures the kubelet to instruct pods to use the CoreDNS service IP address for name resolution.
Procedure
The DNS Operator is deployed during installation with a Deployment object.
Use the
oc getcommand to view the deployment status:$ oc get -n openshift-dns-operator deployment/dns-operator
Example output
NAME READY UP-TO-DATE AVAILABLE AGE dns-operator 1/1 1 1 23h
Use the
oc getcommand to view the state of the DNS Operator:$ oc get clusteroperator/dns
Example output
NAME VERSION AVAILABLE PROGRESSING DEGRADED SINCE dns 4.1.0-0.11 True False False 92m
AVAILABLE,PROGRESSINGandDEGRADEDprovide information about the status of the operator.AVAILABLEisTruewhen at least 1 pod from the CoreDNS daemon set reports anAvailablestatus condition.
