Contents

Kubernetes Change Service for API Server Security

Check the Service

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ps aux | grep kube-apiserver
--kubernetes-service-node-port
You can see --kubernetes-service-node-port=31000

Check Exist Services

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kubectl get svc
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NAME         TYPE       CLUSTER-IP   EXTERNAL-IP   PORT(S)         AGE
kubernetes   NodePort   10.96.0.1    <none>        443:31000/TCP   5d3h

Backup

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cp /etc/kubernetes/manifests/kube-apiserver.yaml ~/

Edit /etc/kubernetes/manifests/kube-apiserver.yaml

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apiVersion: v1
kind: Pod
metadata:
  annotations:
    kubeadm.kubernetes.io/kube-apiserver.advertise-address.endpoint: 192.168.100.11:6443
  creationTimestamp: null
  labels:
    component: kube-apiserver
    tier: control-plane
  name: kube-apiserver
  namespace: kube-system
spec:
  containers:
    - command:
        - kube-apiserver
        - --advertise-address=192.168.100.11
        - --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
        - --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
        #    - --kubernetes-service-node-port=31000   # delete or set to 0
        - --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.crt
        - --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client.key
...

Delete the Service

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kubectl delete svc kubernetes