coredns自定义的解析记录

找到kube-system命名空间的名称为coredns的configmap：

kubectl get configmap coredns -n kube-system
NAME DATA AGE
coredns 1 9d

编辑这个configmap:

kubectl edit configmap coredns -n kube-system

apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors
        health
        kubernetes cluster.local in-addr.arpa ip6.arpa {
          pods insecure
          upstream
          fallthrough in-addr.arpa ip6.arpa
          ttl 30
        }
        hosts {
            10.0.0.22 cos6-data1.test.alltest.com
            10.0.0.23 cos6-data2.test.alltest.com
            10.0.0.24 cos6-data3.test.alltest.com
            10.0.0.25 cos6-data4.test.alltest.com
            10.0.0.26 cos6-data5.test.alltest.com
            10.0.0.41 cos6-datanode6.test.alltest.com
            10.0.0.42 cos6-datanode7.test.alltest.com
            10.0.0.43 cos6-datanode8.test.alltest.com
            10.0.0.44 cos6-datanode9.test.alltest.com
        }
        prometheus :9153
        forward . "/etc/resolv.conf"
        cache 30
        loop
        reload
        loadbalance
    }
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system

重启coredns：

kubectl scale deployment coredns -n kube-system --replicas=0
deployment.extensions/coredns scaled

kubectl scale deployment coredns -n kube-system --replicas=2
deployment.extensions/coredns scaled