k8s 更改pod数量限制（默认每个节点最多110组pod）

 

1、登录 node 节点，查看kubelet启动文件路径

[root@xxxxxxxZ ~]# systemctl status kubelet
● kubelet.service - kubelet: The Kubernetes Node Agent
   Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)    # 启动文件的路径
  Drop-In: /etc/systemd/system/kubelet.service.d
           └─10-kubeadm.conf
   Active: active (running) since Wed 2022-03-09 15:46:25 CST; 18min ago
     Docs: http://kubernetes.io/docs/
 Main PID: 1460414 (kubelet)
    Tasks: 27
   Memory: 95.2M
   CGroup: /system.slice/kubelet.service
           └─1460414 /usr/bin/kubelet --bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf --pod-manifest-pat...

Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.488234 1460414 prober.go:126] Readiness probe for "kube-state-metrics-58d8cb654...ucceeded
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.584782 1460414 kubelet_pods.go:1486] Generating status for "kube-state-metrics-...75f357)"
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.585014 1460414 status_manager.go:429] Ignoring same status for pod "kube-state-...nsitionT
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.585339 1460414 volume_manager.go:373] Waiting for volumes to attach and mount f...75f357)"
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.585441 1460414 volume_manager.go:404] All volumes are attached and mounted for ...75f357)"
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.585610 1460414 kuberuntime_manager.go:678] computePodActions got {KillPod:false CreateS...
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.609168 1460414 httplog.go:108] "HTTP" verb="GET" URI="/metrics" latency="6.5896...bb7b388"
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.749611 1460414 secret.go:183] Setting up volume arms-prom-operator-token-css2f ...en-css2f
Mar 09 16:04:56 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:56.749705 1460414 secret.go:207] Received secret arms-prom/arms-prom-operator-toke...al bytes
Mar 09 16:04:57 iZbp1eif4saampbcc8x3rkZ kubelet[1460414]: I0309 16:04:57.039218 1460414 prober.go:126] Readiness probe for "coredns-5fd465f88b-bfh6c_kub...ucceeded
Hint: Some lines were ellipsized, use -l to show in full.

2、查看 systemd 启动文件

[root@ixxxxxxZ ~]# cat /etc/systemd/system/kubelet.service
[Unit]
Description=kubelet: The Kubernetes Node Agent
Documentation=http://kubernetes.io/docs/
After=docker.service containerd.service

[Service]
EnvironmentFile=-/etc/sysconfig/kubelet  # 没有就新增
ExecStart=/usr/bin/kubelet
Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target

可以看到，Environment文件是引用/etc/sysconfig/kubelet

3、修改/etc/kubernetes/kubelet,增加限制数量（没有就新增以下内容）

[root@xxxxxxxxZ ~]# vim /etc/sysconfig/kubelet

KUBELET_EXTRA_ARGS="--fail-swap-on=false --max-pods=300"　

4、修改/etc/systemd/system/kubelet.service

[root@xxxxxxxZ ~]# cat /etc/systemd/system/kubelet.service
[Unit]
Description=kubelet: The Kubernetes Node Agent
Documentation=http://kubernetes.io/docs/
After=docker.service containerd.service

[Service]
EnvironmentFile=-/etc/sysconfig/kubelet
ExecStart=/usr/bin/kubelet $KUBELET_EXTRA_ARGS  # 增加变量
Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target　

5 、重启kubelet

[root@iZbp1eif4saampbcc8x3rkZ ~]# systemctl daemon-reload
[root@iZbp1eif4saampbcc8x3rkZ ~]# systemctl restart kubelet

6、查看修改后限制数