Kubernetes Pod 默认的DNS策略为：ClusterFirst，即默认使用集群内部DNS，所以如果想要增加内部DNS解析可以通过修改集群内CoreDNS的配置文件完成。

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➜  ~ kubectl -n kube-system edit cm coredns

添加如下配置

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        hosts {
           192.168.122.81 xnile.cn
           fallthrough
        }

整个配置文件如下

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apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors
        health
        hosts {
           192.168.122.81 xnile.cn
           fallthrough
        }
        kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           upstream
           fallthrough in-addr.arpa ip6.arpa
           ttl 30
        }
        prometheus :9153
        forward . /etc/resolv.conf
        cache 30
        loop
        reload
        loadbalance
    }    
kind: ConfigMap
metadata:
  name: coredns
  namespace: kube-system