---

1. 修改 kube-apiserver.yaml

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

......
spec:
  containers:
  - command:
    - kube-apiserver
    - --advertise-address=192.168.10.65
    - --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
    - --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-issuer=https://kubernetes.default.svc.cluster.local
    - --service-account-key-file=/etc/kubernetes/pki/sa.pub
    - --service-account-signing-key-file=/etc/kubernetes/pki/sa.key
    - --service-cluster-ip-range=10.96.0.0/12
    - --tls-cert-file=/etc/kubernetes/pki/apiserver.crt
    - --tls-private-key-file=/etc/kubernetes/pki/apiserver.key
    - --feature-gates=RemoveSelfLink=false
    # 添加如下两行配置
    - --default-not-ready-toleration-seconds=40
    - --default-unreachable-toleration-seconds=20
......
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重启 kubelet

systemctl daemon-reload
systemctl restart kubelet
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注意：修改的参数只对之后创建的 pod 生效，旧的 pod 不生效

2. 测试

[root@master ~]#kubectl get nodes
NAME     STATUS   ROLES                  AGE   VERSION
master   Ready    control-plane,master   46d   v1.22.5
node01   Ready    <none>                 46d   v1.22.5
node02   Ready    <none>                 46d   v1.22.5
[root@master ~]#kubectl get pods -o wide -n test
NAME                         READY   STATUS    RESTARTS   AGE   IP            NODE     NOMINATED NODE   READINESS GATES
open-test-59fd6fdfc4-2tmlj   1/1     Running   0          27m   10.244.2.78   node02   <none>           <none>
open-test-59fd6fdfc4-6ft4b   1/1     Running   0          26m   10.244.0.64   master   <none>           <none>
open-test-59fd6fdfc4-drcph   1/1     Running   0          27m   10.244.2.81   node02   <none>           <none>
open-test-59fd6fdfc4-k85jj   1/1     Running   0          26m   10.244.2.82   node02   <none>           <none>
open-test-59fd6fdfc4-snk8l   1/1     Running   0          27m   10.244.2.79   node02   <none>           <none>
open-test-59fd6fdfc4-t2lk5   1/1     Running   0          27m   10.244.0.60   master   <none>           <none>
open-test-59fd6fdfc4-vz4tb   1/1     Running   0          27m   10.244.2.80   node02   <none>           <none>
open-test-59fd6fdfc4-w2dq7   1/1     Running   0          27m   10.244.0.61   master   <none>           <none>
open-test-59fd6fdfc4-xlkdm   1/1     Running   0          26m   10.244.0.63   master   <none>           <none>
open-test-59fd6fdfc4-xt5b8   1/1     Running   0          27m   10.244.0.62   master   <none>           <none>
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目前服务在 master 和 node02 上，关停 node02，观察多长时间 node02 节点 NotReady，多长时间 pod 开始漂移到其他节点

# 10.37
[root@master ~]#kubectl get nodes
NAME     STATUS   ROLES                  AGE   VERSION
master   Ready    control-plane,master   46d   v1.22.5
node01   Ready    <none>                 46d   v1.22.5
node02   Ready    <none>                 46d   v1.22.5
# 10.37 我秒表测试大概 40s 左右
[root@master ~]#kubectl get nodes
NAME     STATUS     ROLES                  AGE   VERSION
master   Ready      control-plane,master   46d   v1.22.5
node01   Ready      <none>                 46d   v1.22.5
node02   NotReady   <none>                 46d   v1.22.5
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# 10.38 一分钟左右 pod 开始漂移
[root@master ~]#kubectl get pods -o wide -n test
NAME                         READY   STATUS        RESTARTS   AGE   IP            NODE     NOMINATED NODE   READINESS GATES
open-test-59fd6fdfc4-2c52v   1/1     Running       0          12s   10.244.1.63   node01   <none>           <none>
open-test-59fd6fdfc4-2tmlj   1/1     Terminating   0          35m   10.244.2.78   node02   <none>           <none>
open-test-59fd6fdfc4-6ft4b   1/1     Running       0          33m   10.244.0.64   master   <none>           <none>
open-test-59fd6fdfc4-bc2bb   1/1     Running       0          12s   10.244.1.67   node01   <none>           <none>
open-test-59fd6fdfc4-drcph   1/1     Terminating   0          35m   10.244.2.81   node02   <none>           <none>
open-test-59fd6fdfc4-k85jj   1/1     Terminating   0          33m   10.244.2.82   node02   <none>           <none>
open-test-59fd6fdfc4-mnz6v   1/1     Running       0          12s   10.244.1.64   node01   <none>           <none>
open-test-59fd6fdfc4-snk8l   1/1     Terminating   0          35m   10.244.2.79   node02   <none>           <none>
open-test-59fd6fdfc4-srxx5   1/1     Running       0          12s   10.244.1.65   node01   <none>           <none>
open-test-59fd6fdfc4-t2lk5   1/1     Running       0          35m   10.244.0.60   master   <none>           <none>
open-test-59fd6fdfc4-v4ntz   1/1     Running       0          12s   10.244.1.66   node01   <none>           <none>
open-test-59fd6fdfc4-vz4tb   1/1     Terminating   0          35m   10.244.2.80   node02   <none>           <none>
open-test-59fd6fdfc4-w2dq7   1/1     Running       0          35m   10.244.0.61   master   <none>           <none>
open-test-59fd6fdfc4-xlkdm   1/1     Running       0          33m   10.244.0.63   master   <none>           <none>
open-test-59fd6fdfc4-xt5b8   1/1     Running       0          35m   10.244.0.62   master   <none>           <none>
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官方默认的参数：节点大概 1m 会变成 NotReady，5m 左右开始 Pod 发生漂移，修改上述参数后速度明显变快。需要注意的是节点 NotReady 时间，Pod 漂移时间和集群规模，网络延迟等都有影响，不能一概而论。

3. 修改 Pod 文件添加容忍设置

toleration-custom.yaml

spec:
  template:
    spec:
      tolerations:
      - effect: NoExecute
        key: node.kubernetes.io/not-ready
        operator: Exists
        tolerationSeconds: 40
      - effect: NoExecute
        key: node.kubernetes.io/unreachable
        operator: Exists
        tolerationSeconds: 20
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使用 patch 的方式添加到指定 deployment 文件

kubectl patch deploy nginx-check --patch "$(cat  toleration-custom.yaml)"
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这是只对需要的 pod 应用修改参数，kube-apiserver.yaml 是全局设置

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