kubernetes的服务发现插件-CoreDNS

1.部署kubernetesubernetes的内网资源配置清单

在hdss7-200.host.com上，配置一个nginx，用以提供kubernetes统一的访问资源清单入口

[root@hdss7-200 html]# vi /etc/nginx/conf.d/k8s-yaml.od.com.conf
server {
    listen       80;
    server_name  k8s-yaml.od.com;

    location / {
        autoindex on;
        default_type text/plain;
        root /data/k8s-yaml;
    }
}
[root@hdss7-200 html]# nginx -t
[root@hdss7-200 html]# nginx -s reload
[root@hdss7-200 html]# cd /data
[root@hdss7-200 data]# mkdir k8s-yaml
[root@hdss7-200 data]# cd k8s-yaml/
[root@hdss7-200 k8s-yaml]# mkdir coredns

2.配置dns解析

[root@hdss7-11 ~]# vi /var/named/od.com.zone
$origin od.com.
$ttl 600        ; 10 minutes
@               in soa  dns.od.com. dnsadmin.od.com. (
                                2019111003 ; serial
                                10800      ; refresh (3 hours)
                                900        ; retry (15 minutes)
                                604800     ; expire (1 week)
                                86400      ; minimum (1 day)
                                )
                                ns   dns.od.com.
$ttl 60 ; 1 minute
dns                a    10.4.7.11
harbor             a    10.4.7.200
k8s-yaml           a    10.4.7.200

[root@hdss7-11 ~]# systemctl restart named
[root@hdss7-11 ~]# dig -t a k8s-yaml.od.com @10.4.7.11 +short
10.4.7.200

3.浏览器访问k8s-yaml.od.com

4.下载docker镜像并打包上传到harbor仓库

[root@hdss7-200 ~]# docker pull coredns/coredns:1.6.1
[root@hdss7-200 coredns]# docker tag c0f6e815079e harbor.od.com/public/coredns:v1.6.1
[root@hdss7-200 coredns]# docker  push harbor.od.com/public/coredns:v1.6.1

5.准备资源配置清单

rbac.yaml

[root@hdss7-200 coredns]# vi rbac.yaml
apiversion: v1
kind: serviceaccount
metadata:
  name: coredns
  namespace: kube-system
  labels:
      kubernetes.io/cluster-service: "true"
      addonmanager.kubernetes.io/mode: reconcile
---
apiversion: rbac.authorization.k8s.io/v1
kind: clusterrole
metadata:
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    addonmanager.kubernetes.io/mode: reconcile
  name: system:coredns
rules:
- apigroups:
  - ""
  resources:
  - endpoints
  - services
  - pods
  - namespaces
  verbs:
  - list
  - watch
---
apiversion: rbac.authorization.k8s.io/v1
kind: clusterrolebinding
metadata:
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
  labels:
    kubernetes.io/bootstrapping: rbac-defaults
    addonmanager.kubernetes.io/mode: ensureexists
  name: system:coredns
roleref:
  apigroup: rbac.authorization.k8s.io
  kind: clusterrole
  name: system:coredns
subjects:
- kind: serviceaccount
  name: coredns
  namespace: kube-system

cm.yaml

[root@hdss7-200 coredns]# vi cm.yaml
apiversion: v1
kind: configmap
metadata:
  name: coredns
  namespace: kube-system
data:
  corefile: |
    .:53 {
        errors
        log
        health
        ready
        kubernetes cluster.local 192.168.0.0/16
        forward . 10.4.7.11
        cache 30
        loop
        reload
        loadbalance
       }

dp.yaml

[root@hdss7-200 coredns]# vi dp.yaml
apiversion: apps/v1
kind: deployment
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: coredns
    kubernetes.io/name: "coredns"
spec:
  replicas: 1
  selector:
    matchlabels:
      k8s-app: coredns
  template:
    metadata:
      labels:
        k8s-app: coredns
    spec:
      priorityclassname: system-cluster-critical
      serviceaccountname: coredns
      containers:
      - name: coredns
        image: harbor.od.com/public/coredns:v1.6.1
        args:
        - -conf
        - /etc/coredns/corefile
        volumemounts:
        - name: config-volume
          mountpath: /etc/coredns
        ports:
        - containerport: 53
          name: dns
          protocol: udp
        - containerport: 53
          name: dns-tcp
          protocol: tcp
        - containerport: 9153
          name: metrics
          protocol: tcp
        livenessprobe:
          httpget:
            path: /health
            port: 8080
            scheme: http
          initialdelayseconds: 60
          timeoutseconds: 5
          successthreshold: 1
          failurethreshold: 5
      dnspolicy: default
      volumes:
        - name: config-volume
          configmap:
            name: coredns
            items:
            - key: corefile
              path: corefile

svc.yaml

[root@hdss7-200 coredns]# vi svc.yaml
apiversion: v1
kind: service
metadata:
  name: coredns
  namespace: kube-system
  labels:
    k8s-app: coredns
    kubernetes.io/cluster-service: "true"
    kubernetes.io/name: "coredns"
spec:
  selector:
    k8s-app: coredns
  clusterip: 192.168.0.2
  ports:
  - name: dns
    port: 53
    protocol: udp
  - name: dns-tcp
    port: 53
  - name: metrics
    port: 9153
    protocol: tcp

6.应用资源配置

[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.od.com/coredns/rbac.yaml
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.od.com/coredns/cm.yaml
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.od.com/coredns/dp.yaml
[root@hdss7-21 ~]# kubectl apply -f http://k8s-yaml.od.com/coredns/svc.yaml

7.检查创建的资源

[root@hdss7-21 ~]# kubectl get all -n kube-system -o wide

8.验证coredns

[root@hdss7-21 ~]# dig -t a www.baidu.com @192.168.0.2 +short
www.a.shifen.com.
14.215.177.38
14.215.177.39

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