kubernetes更改coredns增加解析

kubernetes更改coredns增加解析

k8s中coredns可以为全集群提供dns解析功能， 所以如果我们要手动增加dns解析， 只需在coredns中增加dns解析对即可

1. 编辑coredns
kubectl edit cm/coredns -n kube-system

apiVersion: v1
data:
  Corefile: |
    .:53 {
        errors
        health {
           lameduck 5s
        }
        ready
        kubernetes cluster.local in-addr.arpa ip6.arpa {
           pods insecure
           fallthrough in-addr.arpa ip6.arpa
           ttl 30
        }
        prometheus :9153
        forward . /etc/resolv.conf {
           max_concurrent 1000
        }
        cache 30
        loop
        reload
        loadbalance
        hosts {                             #增加 dns解析
        150.158.179.155 jerry.plus
        fallthrough
        }
    }
kind: ConfigMap
metadata:
  creationTimestamp: "2022-03-04T15:36:40Z"
  managedFields:
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:data: {}
    manager: kubeadm
    operation: Update
    time: "2022-03-04T15:36:40Z"
  - apiVersion: v1
    fieldsType: FieldsV1
    fieldsV1:
      f:data:
        f:Corefile: {}
    manager: kubectl-edit
    operation: Update
    time: "2022-03-05T09:43:32Z"
  name: coredns
  namespace: kube-system
  resourceVersion: "12284"
  selfLink: /api/v1/namespaces/kube-system/configmaps/coredns
  uid: 4da2236c-d3bc-43b4-8bdf-0a7a2a368c57

hosts {
            150.158.179.155 jerry.plus
            fallthrough
        }
# 注意 hosts 增加与 prometheus 对齐

参考：https://www.jianshu.com/p/6999b185a2bc