Kubernetes1.8.4中如何安装Kube-proxy和Kube-dns

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Kube-proxy

Kube-proxy 是实现 Service 的关键组件，kube-proxy 会在每台节点上执行，然后监听 API Server 的 Service 与 Endpoint 资源对象的改变，然后来依据变化执行 iptables 来实现网络的转发。这边我们会需要建议一个 DaemonSet 来执行，并且创建一些需要的certificate。Kubernetes 1.8 kube-proxy 开启 ipvs。

在master生成kube-proxy-csr.json文件，并产生 kube-proxy certificate 证书
生成kube-proxy-csr.json文件

cd /etc/kubernetes/pki

cat < kube-proxy-csr.json
{
    "CN": "system:kube-proxy",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "SC",
            "ST": "ChengDu",
            "L": "ChengDu",
            "O": "system:kube-proxy",
            "OU": "Kubernetes-manual"
        }
    ]
}
EOF

生成证书

cfssl gencert \
  -ca=ca.pem \
  -ca-key=ca-key.pem \
  -config=ca-config.json \
  -profile=kubernetes \
  kube-proxy-csr.json | cfssljson -bare kube-proxy

生成名称为 kube-proxy.conf 的 kubeconfig文件

# kube-proxy set-cluster
kubectl config set-cluster kubernetes \
    --certificate-authority=ca.pem \
    --embed-certs=true \
    --server="https://10.0.0.162:6443" \
    --kubeconfig=../kube-proxy.conf

# kube-proxy set-credentials
 kubectl config set-credentials system:kube-proxy \
    --client-key=kube-proxy-key.pem \
    --client-certificate=kube-proxy.pem \
    --embed-certs=true \
    --kubeconfig=../kube-proxy.conf

# kube-proxy set-context
kubectl config set-context system:kube-proxy@kubernetes \
    --cluster=kubernetes \
    --user=system:kube-proxy \
    --kubeconfig=../kube-proxy.conf

# kube-proxy set default context
kubectl config use-context system:kube-proxy@kubernetes \
    --kubeconfig=../kube-proxy.conf

在master将kube-proxy相关文件复制到 Node 节点上

cd /etc/kubernetes

for NODE in node163 node164; do
    for FILE in pki/kube-proxy.pem pki/kube-proxy-key.pem kube-proxy.conf; do
      scp /etc/kubernetes/${FILE} ${NODE}:/etc/kubernetes/${FILE}
    done
  done

完成后，在master通过 kubectl 来创建 kube-proxy daemon

mkdir -p /etc/kubernetes/addons && cd /etc/kubernetes/addons

生成kube-proxy.yml

cat < kube-proxy.yml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: kube-proxy
  labels:
    k8s-app: kube-proxy
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
  namespace: kube-system
---
apiVersion: extensions/v1beta1
kind: DaemonSet
metadata:
  name: kube-proxy
  labels:
    k8s-app: kube-proxy
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
  namespace: kube-system
spec:
  selector:
    matchLabels:
      k8s-app: kube-proxy
  templateGeneration: 1
  updateStrategy:
    rollingUpdate:
      maxUnavailable: 1
    type: RollingUpdate
  template:
    metadata:
      labels:
        k8s-app: kube-proxy
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
    spec:
      serviceAccountName: kube-proxy
      hostNetwork: true
      containers:
      - name: kube-proxy
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-proxy-amd64:v1.8.4
        command:
        - kube-proxy
        - --v=0
        - --logtostderr=true
        - --kubeconfig=/run/kube-proxy.conf
        - --cluster-cidr=10.244.0.0/16
        - --proxy-mode=iptables
        imagePullPolicy: IfNotPresent
        securityContext:
          privileged: true
        volumeMounts:
        - mountPath: /run/kube-proxy.conf
          name: kubeconfig
          readOnly: true
        - mountPath: /etc/kubernetes/pki
          name: k8s-certs
          readOnly: true
      dnsPolicy: ClusterFirst
      restartPolicy: Always
      terminationGracePeriodSeconds: 30
      volumes:
      - hostPath:
          path: /etc/kubernetes/kube-proxy.conf
          type: FileOrCreate
        name: kubeconfig
      - hostPath:
          path: /etc/kubernetes/pki
          type: DirectoryOrCreate
        name: k8s-certs
EOF

kubectl apply -f kube-proxy.yml

查看状态

kubectl -n kube-system get po -l k8s-app=kube-proxy

Kube-dns

Kube DNS 是 Kubernetes 集群内部 Pod 之间互相沟通的重要 Addon，它允许 Pod 可以通过 Domain Name 方式来连接 Service，其主要由 Kube DNS 与 Sky DNS 组合而成，通过 Kube DNS 监听 Service 与 Endpoint 变化，来提供给 Sky DNS 信息，已更新解析地址。

只需要在master通过 kubectl 来创建 kube-dns deployment 即可

cat < kube-dns.yml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: kube-dns
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
  namespace: kube-system
---
apiVersion: v1
kind: Service
metadata:
  name: kube-dns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  selector:
    k8s-app: kube-dns
  clusterIP: 10.96.0.10
  ports:
  - name: dns
    port: 53
    protocol: UDP
  - name: dns-tcp
    port: 53
    protocol: TCP
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
  name: kube-dns
  namespace: kube-system
  labels:
    k8s-app: kube-dns
    kubernetes.io/cluster-service: "true"
    addonmanager.kubernetes.io/mode: Reconcile
spec:
  strategy:
    rollingUpdate:
      maxSurge: 10%
      maxUnavailable: 0
  selector:
    matchLabels:
      k8s-app: kube-dns
  template:
    metadata:
      labels:
        k8s-app: kube-dns
      annotations:
        scheduler.alpha.kubernetes.io/critical-pod: ''
    spec:
      dnsPolicy: Default
      serviceAccountName: kube-dns
      tolerations:
      - key: "CriticalAddonsOnly"
        operator: "Exists"
      - key: node-role.kubernetes.io/master
        effect: NoSchedule
      volumes:
      - name: kube-dns-config
        configMap:
          name: kube-dns
          optional: true
      containers:
      - name: kubedns
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/k8s-dns-kube-dns-amd64:1.14.7
        resources:
          limits:
            memory: 170Mi
          requests:
            cpu: 100m
            memory: 70Mi
        livenessProbe:
          httpGet:
            path: /healthcheck/kubedns
            port: 10054
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        readinessProbe:
          httpGet:
            path: /readiness
            port: 8081
            scheme: HTTP
          initialDelaySeconds: 3
          timeoutSeconds: 5
        args:
        - "--domain=cluster.local"
        - --dns-port=10053
        - --v=2
        env:
        - name: PROMETHEUS_PORT
          value: "10055"
        ports:
        - containerPort: 10053
          name: dns-local
          protocol: UDP
        - containerPort: 10053
          name: dns-tcp-local
          protocol: TCP
        - containerPort: 10055
          name: metrics
          protocol: TCP
        volumeMounts:
        - name: kube-dns-config
          mountPath: /kube-dns-config
      - name: dnsmasq
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/k8s-dns-dnsmasq-nanny-amd64:1.14.7
        livenessProbe:
          httpGet:
            path: /healthcheck/dnsmasq
            port: 10054
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        args:
        - "-v=2"
        - "-logtostderr"
        - "-configDir=/etc/k8s/dns/dnsmasq-nanny"
        - "-restartDnsmasq=true"
        - "--"
        - "-k"
        - "--cache-size=1000"
        - "--log-facility=-"
        - "--server=/cluster.local/127.0.0.1#10053"
        - "--server=/in-addr.arpa/127.0.0.1#10053"
        - "--server=/ip6.arpa/127.0.0.1#10053"
        ports:
        - containerPort: 53
          name: dns
          protocol: UDP
        - containerPort: 53
          name: dns-tcp
          protocol: TCP
        resources:
          requests:
            cpu: 150m
            memory: 20Mi
        volumeMounts:
        - name: kube-dns-config
          mountPath: /etc/k8s/dns/dnsmasq-nanny
      - name: sidecar
        image: registry.cn-hangzhou.aliyuncs.com/google_containers/k8s-dns-sidecar-amd64:1.14.7
        livenessProbe:
          httpGet:
            path: /metrics
            port: 10054
            scheme: HTTP
          initialDelaySeconds: 60
          timeoutSeconds: 5
          successThreshold: 1
          failureThreshold: 5
        args:
        - "--v=2"
        - "--logtostderr"
        - "--probe=kubedns,127.0.0.1:10053,kubernetes.default.svc.cluster.local,5,A"
        - "--probe=dnsmasq,127.0.0.1:53,kubernetes.default.svc.cluster.local,5,A"
        ports:
        - containerPort: 10054
          name: metrics
          protocol: TCP
        resources:
          requests:
            memory: 20Mi
            cpu: 10m
EOF

kubectl apply -f kube-dns.yml

查看状态

kubectl -n kube-system get po -l k8s-app=kube-dns

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Kubernetes1.8.4中如何安装Kube-proxy和Kube-dns

Kube-proxy

Kube-dns

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