在 Kubernetes 集群中，NodePort 默认范围是 30000-32767，某些情况下，因为您所在公司的网络策略限制，您可能需要修改 NodePort 的端口范围

修改kube-apiserver.yaml

使用 kubeadm 安装 K8S 集群的情况下，您的 Master 节点上会有一个文件 /etc/kubernetes/manifests/kube-apiserver.yaml，修改此文件，向其中添加 --service-node-port-range=20000-22767 （请使用您自己需要的端口范围），如下所示：

apiVersion: v1

kind: Pod

metadata:

  creationTimestamp: null

  labels:

    component: kube-apiserver

    tier: control-plane

  name: kube-apiserver

  namespace: kube-system

spec:

  containers:

  - command:

    - kube-apiserver

    - --advertise-address=172.17.216.80

    - --allow-privileged=true

    - --authorization-mode=Node,RBAC

    - --client-ca-file=/etc/kubernetes/pki/ca.crt

    - --enable-admission-plugins=NodeRestriction

    - --enable-bootstrap-token-auth=true

    - --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt

    - --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt

    - --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key

    - --etcd-servers=https://127.0.0.1:2379

    - --insecure-port=0

    - --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt

    - --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key

    - --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname

    - --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt

    - --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key

    - --requestheader-allowed-names=front-proxy-client

    - --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt

    - --requestheader-extra-headers-prefix=X-Remote-Extra-

    - --requestheader-group-headers=X-Remote-Group

    - --requestheader-username-headers=X-Remote-User

    - --secure-port=6443

    - --service-account-key-file=/etc/kubernetes/pki/sa.pub

    - --service-cluster-ip-range=10.96.0.0/12

    - --service-node-port-range=20000-22767  # 新增这一行配置

    - --tls-cert-file=/etc/kubernetes/pki/apiserver.crt

    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key

    image: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.16.0

    imagePullPolicy: IfNotPresent

    livenessProbe:

      failureThreshold: 8

      httpGet:

        host: 172.17.216.80

        path: /healthz

        port: 6443

        scheme: HTTPS

      initialDelaySeconds: 15

      timeoutSeconds: 15

  ...

重启apiserver

# 获得 apiserver 的 pod 名字

export apiserver_pods=$(kubectl get pods --selector=component=kube-apiserver -n kube-system --output=jsonpath={.items..metadata.name})

# 删除 apiserver 的 pod

kubectl delete pod $apiserver_pods -n kube-system

验证结果

kubectl describe pod $apiserver_pods -n kube-system

输出结果如下所示：（此时，我们可以看到，apiserver 已经使用新的命令行参数启动）

...

    Host Port:     <none>

    Command:

      kube-apiserver

      --advertise-address=172.17.216.80

      --allow-privileged=true

      --authorization-mode=Node,RBAC

      --client-ca-file=/etc/kubernetes/pki/ca.crt

      --enable-admission-plugins=NodeRestriction

      --enable-bootstrap-token-auth=true

      --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt

      --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt

      --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key

      --etcd-servers=https://127.0.0.1:2379

      --insecure-port=0

      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt

      --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key

      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname

      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt

      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key

      --requestheader-allowed-names=front-proxy-client

      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt

      --requestheader-extra-headers-prefix=X-Remote-Extra-

      --requestheader-group-headers=X-Remote-Group

      --requestheader-username-headers=X-Remote-User

      --secure-port=6443

      --service-account-key-file=/etc/kubernetes/pki/sa.pub

      --service-cluster-ip-range=10.96.0.0/12

      --service-node-port-range=20000-22767 # 注意查看是否有这一行

      --tls-cert-file=/etc/kubernetes/pki/apiserver.crt

      --tls-private-key-file=/etc/kubernetes/pki/apiserver.key

    State:          Running

      Started:      Mon, 11 Nov 2019 21:31:39 +0800

    Ready:          True

    Restart Count:  0

    Requests:

      cpu:        250m

  ...

注意

对于已经创建的NodePort类型的Service，您需要删除重新创建

如果您的集群有多个 Master 节点，您需要逐个修改每个节点上的 /etc/kubernetes/manifests/kube-apiserver.yaml 文件，并重启 apiserver

巴特西

修改NodePort的范围

修改kube-apiserver.yaml

重启apiserver

验证结果

最新文章

热门文章