140 lines
5.5 KiB
Markdown
140 lines
5.5 KiB
Markdown
---
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vssueId: 15
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# layout: StepLayout
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description: Kubernete安装后_默认NodePort的范围是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_本文描述了具体的操作方法
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meta:
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- name: keywords
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content: Kubernetes安装,K8S安装,kubeadm,NodePort范围
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---
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# 修改NodePort的范围
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<AdSenseTitle>
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在 Kubernetes 集群中，[NodePort](/learning/k8s-intermediate/service/service-types.html#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，本文描述了具体的操作方法。
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</AdSenseTitle>
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### 修改kube-apiserver.yaml
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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：
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``` yaml {38}
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apiVersion: v1
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kind: Pod
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metadata:
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creationTimestamp: null
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labels:
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component: kube-apiserver
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tier: control-plane
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name: kube-apiserver
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namespace: kube-system
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spec:
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containers:
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- command:
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- kube-apiserver
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- --advertise-address=172.17.216.80
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- --allow-privileged=true
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- --authorization-mode=Node,RBAC
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- --client-ca-file=/etc/kubernetes/pki/ca.crt
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- --enable-admission-plugins=NodeRestriction
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- --enable-bootstrap-token-auth=true
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- --etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
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- --etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
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- --etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
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- --etcd-servers=https://127.0.0.1:2379
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- --insecure-port=0
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- --kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
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- --kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
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- --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
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- --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
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- --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
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- --requestheader-allowed-names=front-proxy-client
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- --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
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- --requestheader-extra-headers-prefix=X-Remote-Extra-
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- --requestheader-group-headers=X-Remote-Group
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- --requestheader-username-headers=X-Remote-User
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- --secure-port=6443
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- --service-account-key-file=/etc/kubernetes/pki/sa.pub
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- --service-cluster-ip-range=10.96.0.0/12
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- --service-node-port-range=20000-22767
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- --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
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- --tls-private-key-file=/etc/kubernetes/pki/apiserver.key
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image: registry.cn-hangzhou.aliyuncs.com/google_containers/kube-apiserver:v1.16.0
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imagePullPolicy: IfNotPresent
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livenessProbe:
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failureThreshold: 8
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httpGet:
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host: 172.17.216.80
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path: /healthz
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port: 6443
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scheme: HTTPS
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initialDelaySeconds: 15
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timeoutSeconds: 15
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...
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```
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### 重启apiserver
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执行以下命令，重启 apiserver
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``` sh
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# 获得 apiserver 的 pod 名字
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export apiserver_pods=$(kubectl get pods --selector=component=kube-apiserver -n kube-system --output=jsonpath={.items..metadata.name})
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# 删除 apiserver 的 pod
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kubectl delete pod $apiserver_pods -n kube-system
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```
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### 验证结果
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执行以下命令，验证修改是否生效：
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``` sh
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kubectl describe pod $apiserver_pods -n kube-system
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```
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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）
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``` {29}
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...
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Host Port: <none>
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Command:
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kube-apiserver
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--advertise-address=172.17.216.80
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--allow-privileged=true
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--authorization-mode=Node,RBAC
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--client-ca-file=/etc/kubernetes/pki/ca.crt
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--enable-admission-plugins=NodeRestriction
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--enable-bootstrap-token-auth=true
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--etcd-cafile=/etc/kubernetes/pki/etcd/ca.crt
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--etcd-certfile=/etc/kubernetes/pki/apiserver-etcd-client.crt
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--etcd-keyfile=/etc/kubernetes/pki/apiserver-etcd-client.key
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--etcd-servers=https://127.0.0.1:2379
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--insecure-port=0
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--kubelet-client-certificate=/etc/kubernetes/pki/apiserver-kubelet-client.crt
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--kubelet-client-key=/etc/kubernetes/pki/apiserver-kubelet-client.key
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--kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname
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--proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
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--proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
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--requestheader-allowed-names=front-proxy-client
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--requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.crt
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--requestheader-extra-headers-prefix=X-Remote-Extra-
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--requestheader-group-headers=X-Remote-Group
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--requestheader-username-headers=X-Remote-User
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--secure-port=6443
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--service-account-key-file=/etc/kubernetes/pki/sa.pub
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--service-cluster-ip-range=10.96.0.0/12
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--service-node-port-range=20000-22767
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--tls-cert-file=/etc/kubernetes/pki/apiserver.crt
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--tls-private-key-file=/etc/kubernetes/pki/apiserver.key
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State: Running
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Started: Mon, 11 Nov 2019 21:31:39 +0800
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Ready: True
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Restart Count: 0
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Requests:
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cpu: 250m
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...
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```
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::: tip 注意
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* 对于已经创建的NodePort类型的Service，您需要删除重新创建
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* 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
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:::
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