K8S/kubernetes 修改NodePort的范围
K8S/kubernetes 修改NodePort的范围
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,本文描述了具体的操作方法。
# 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
- --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
执行以下命令,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
执行以下命令,验证修改是否生效:
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:
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
--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
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