mirror of https://github.com/easzlab/kubeasz.git
更新安装coredns的yaml配置和说明
gjmzj
parent
566a374c99
commit
1e3a88d494
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@ -1,25 +1,24 @@
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## 部署 kubedns
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## 部署集群 DNS
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kubedns 是 k8s 集群首先需要部署的，集群中的其他 pods 使用它提供域名解析服务；主要可以解析 `集群服务名` 和 `Pod hostname`；
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DNS 是 k8s 集群首先需要部署的，集群中的其他 pods 使用它提供域名解析服务；主要可以解析 `集群服务名 SVC` 和 `Pod hostname`；目前 k8s v1.9+ 版本可以有两个选择：`kube-dns` 和 `coredns`，可以选择其中一个部署安装。
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### 部署 dns
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配置文件参考 `https://github.com/kubernetes/kubernetes` 项目目录 `kubernetes/cluster/addons/dns`
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更新 `kube-dns to 1.14.8`，如果集群中已经运行kubedns插件，请使用`RollingUpdate`如下：
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+ 安装
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```
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kubectl set image -n kube-system deploy/kube-dns kubedns=mirrorgooglecontainers/k8s-dns-kube-dns-amd64:1.14.8
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kubectl set image -n kube-system deploy/kube-dns dnsmasq=mirrorgooglecontainers/k8s-dns-dnsmasq-nanny-amd64:1.14.8
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kubectl set image -n kube-system deploy/kube-dns sidecar=mirrorgooglecontainers/k8s-dns-sidecar-amd64:1.14.8
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``` bash
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# 安装 kube-dns
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$ kubectl create -f /etc/ansible/manifests/kubedns
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# 或者选择安装 coredns
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$ kubectl create -f /etc/ansible/manifests/coredns
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```
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### 安装
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**kubectl create -f /etc/ansible/manifests/kubedns/[kubedns.yaml](../../manifests/kubedns/kubedns.yaml)**
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+ 注意deploy中使用的 serviceAccount `kube-dns`，该预定义的 ClusterRoleBinding system:kube-dns 将 kube-system 命名空间的 kube-dns ServiceAccount 与 system:kube-dns ClusterRole 绑定， 因此POD 具有访问 kube-apiserver DNS 相关 API 的权限；
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+ 集群 pod默认继承 node的dns 解析，修改 kubelet服务启动参数 --resolv-conf=""，可以更改这个特性，详见 kubelet 启动参数
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### 验证 kubedns
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### 验证 dns服务
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新建一个测试nginx服务
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@ -0,0 +1,160 @@
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# __MACHINE_GENERATED_WARNING__
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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labels:
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kubernetes.io/bootstrapping: rbac-defaults
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addonmanager.kubernetes.io/mode: Reconcile
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name: system:coredns
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rules:
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- apiGroups:
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- ""
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resources:
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- endpoints
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- services
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- pods
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- namespaces
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verbs:
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- list
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- watch
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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annotations:
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rbac.authorization.kubernetes.io/autoupdate: "true"
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labels:
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kubernetes.io/bootstrapping: rbac-defaults
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addonmanager.kubernetes.io/mode: EnsureExists
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name: system:coredns
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: system:coredns
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subjects:
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- kind: ServiceAccount
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name: coredns
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namespace: kube-system
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---
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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addonmanager.kubernetes.io/mode: EnsureExists
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data:
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Corefile: |
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.:53 {
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errors
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health
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kubernetes cluster.local. in-addr.arpa ip6.arpa {
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pods insecure
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upstream
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fallthrough in-addr.arpa ip6.arpa
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}
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prometheus :9153
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proxy . /etc/resolv.conf
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cache 30
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}
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---
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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k8s-app: coredns
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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kubernetes.io/name: "CoreDNS"
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spec:
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replicas: 2
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strategy:
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type: RollingUpdate
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rollingUpdate:
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maxUnavailable: 1
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selector:
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matchLabels:
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k8s-app: coredns
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template:
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metadata:
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labels:
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k8s-app: coredns
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spec:
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serviceAccountName: coredns
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tolerations:
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- key: node-role.kubernetes.io/master
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effect: NoSchedule
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- key: "CriticalAddonsOnly"
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operator: "Exists"
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containers:
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- name: coredns
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image: coredns/coredns:1.0.6
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imagePullPolicy: IfNotPresent
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resources:
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limits:
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memory: 170Mi
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requests:
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cpu: 100m
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memory: 70Mi
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args: [ "-conf", "/etc/coredns/Corefile" ]
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /health
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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dnsPolicy: Default
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volumes:
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- name: config-volume
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configMap:
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name: coredns
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items:
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- key: Corefile
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path: Corefile
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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k8s-app: coredns
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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kubernetes.io/name: "CoreDNS"
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spec:
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selector:
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k8s-app: coredns
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clusterIP: 10.68.0.2
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ports:
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- name: dns
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port: 53
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protocol: UDP
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- name: dns-tcp
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port: 53
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protocol: TCP
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@ -121,3 +121,6 @@
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- name: 准备 kubedns的部署文件 kubedns.yaml
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template: src=kubedns.yaml.j2 dest={{ base_dir }}/manifests/kubedns/kubedns.yaml
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# coredns.yaml文件中部分参数根据hosts文件设置而定，因此需要用template模块替换参数
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- name: 准备 coredns的部署文件 coredns.yaml
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template: src=coredns.yaml.j2 dest={{ base_dir }}/manifests/coredns/coredns.yaml
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@ -0,0 +1,160 @@
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# __MACHINE_GENERATED_WARNING__
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apiVersion: v1
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kind: ServiceAccount
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRole
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metadata:
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labels:
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kubernetes.io/bootstrapping: rbac-defaults
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addonmanager.kubernetes.io/mode: Reconcile
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name: system:coredns
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rules:
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- apiGroups:
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- ""
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resources:
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- endpoints
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- services
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- pods
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- namespaces
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verbs:
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- list
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- watch
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---
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apiVersion: rbac.authorization.k8s.io/v1
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kind: ClusterRoleBinding
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metadata:
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annotations:
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rbac.authorization.kubernetes.io/autoupdate: "true"
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labels:
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kubernetes.io/bootstrapping: rbac-defaults
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addonmanager.kubernetes.io/mode: EnsureExists
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name: system:coredns
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roleRef:
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apiGroup: rbac.authorization.k8s.io
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kind: ClusterRole
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name: system:coredns
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subjects:
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- kind: ServiceAccount
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name: coredns
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namespace: kube-system
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---
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apiVersion: v1
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kind: ConfigMap
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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addonmanager.kubernetes.io/mode: EnsureExists
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data:
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Corefile: |
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.:53 {
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errors
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health
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kubernetes {{ CLUSTER_DNS_DOMAIN }} in-addr.arpa ip6.arpa {
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pods insecure
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upstream
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fallthrough in-addr.arpa ip6.arpa
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}
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prometheus :9153
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proxy . /etc/resolv.conf
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cache 30
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}
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---
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apiVersion: extensions/v1beta1
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kind: Deployment
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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k8s-app: coredns
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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kubernetes.io/name: "CoreDNS"
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spec:
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replicas: 2
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strategy:
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type: RollingUpdate
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rollingUpdate:
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maxUnavailable: 1
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selector:
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matchLabels:
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k8s-app: coredns
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template:
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metadata:
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labels:
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k8s-app: coredns
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spec:
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serviceAccountName: coredns
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tolerations:
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- key: node-role.kubernetes.io/master
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effect: NoSchedule
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- key: "CriticalAddonsOnly"
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operator: "Exists"
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containers:
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- name: coredns
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image: coredns/coredns:1.0.6
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imagePullPolicy: IfNotPresent
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resources:
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limits:
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memory: 170Mi
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requests:
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cpu: 100m
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memory: 70Mi
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args: [ "-conf", "/etc/coredns/Corefile" ]
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volumeMounts:
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- name: config-volume
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mountPath: /etc/coredns
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ports:
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- containerPort: 53
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name: dns
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protocol: UDP
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- containerPort: 53
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name: dns-tcp
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protocol: TCP
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livenessProbe:
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httpGet:
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path: /health
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port: 8080
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scheme: HTTP
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initialDelaySeconds: 60
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timeoutSeconds: 5
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successThreshold: 1
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failureThreshold: 5
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dnsPolicy: Default
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volumes:
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- name: config-volume
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configMap:
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name: coredns
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items:
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- key: Corefile
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path: Corefile
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---
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apiVersion: v1
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kind: Service
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metadata:
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name: coredns
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namespace: kube-system
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labels:
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k8s-app: coredns
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kubernetes.io/cluster-service: "true"
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addonmanager.kubernetes.io/mode: Reconcile
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kubernetes.io/name: "CoreDNS"
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spec:
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selector:
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k8s-app: coredns
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clusterIP: {{ CLUSTER_DNS_SVC_IP }}
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ports:
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- name: dns
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port: 53
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protocol: UDP
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- name: dns-tcp
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port: 53
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protocol: TCP
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