问题

pod调度失败，显示某个节点 too many pod

查看节点可分配pod数量

 kubectl  describe  no  nodes	#kubeadm 安装的k8s集群默认节点pod总数是110
Capacity:
.........
  pods:                   110

修改节点可容纳pod总数

#查看kubelet.service 的服务文件位置
[root@k8s ~]# systemctl  status kubelet.service 
● kubelet.service - Kubernetes Kubelet Server
   Loaded: loaded (/etc/systemd/system/kubelet.service; enabled; vendor preset: disabled)
   Active: active (running) since Fri 2023-02-17 14:36:02 CST; 2h 20min ago
....................

# 查看kubelet.service 的服务文件内容
cat  /etc/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Wants=docker.socket

[Service]
User=root
EnvironmentFile=-/etc/kubernetes/kubelet.env	#变量文件
ExecStartPre=-/bin/mkdir -p /data/lib/kubelet/volume-plugins
ExecStart=/usr/local/bin/kubelet \
                $KUBE_LOGTOSTDERR \
                $KUBE_LOG_LEVEL \
                $KUBELET_API_SERVER \
                $KUBELET_ADDRESS \
                $KUBELET_PORT \
                $KUBELET_HOSTNAME \
                $KUBE_ALLOW_PRIV \
                $KUBELET_ARGS \
                $DOCKER_SOCKET \
                $KUBELET_NETWORK_PLUGIN \
                $KUBELET_VOLUME_PLUGIN \
                $KUBELET_CLOUDPROVIDER
Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

#打开变量文件，添加变量
vim /etc/kubernetes/kubelet.env
# 追加一个表示pod总数的变量
MAX_PODS="--max-pods=500"

#还要修改kubelet服务文件
vim   /etc/systemd/system/kubelet.service
[Unit]
Description=Kubernetes Kubelet Server
Documentation=https://github.com/GoogleCloudPlatform/kubernetes
After=docker.service
Wants=docker.socket

[Service]
User=root
EnvironmentFile=-/etc/kubernetes/kubelet.env	#变量文件
ExecStartPre=-/bin/mkdir -p /data/lib/kubelet/volume-plugins
ExecStart=/usr/local/bin/kubelet \
                $KUBE_LOGTOSTDERR \
                $KUBE_LOG_LEVEL \
                $KUBELET_API_SERVER \
                $KUBELET_ADDRESS \
                $KUBELET_PORT \
                $KUBELET_HOSTNAME \
                $KUBE_ALLOW_PRIV \
                $KUBELET_ARGS \
                $DOCKER_SOCKET \
                $KUBELET_NETWORK_PLUGIN \
                $KUBELET_VOLUME_PLUGIN \
                $KUBELET_CLOUDPROVIDER \	#这个斜杠不用忘记加了
                $MAX_PODS					#加上刚才添加的pod数量变量
Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

重启kubelet服务，再次查看节点可容纳数量。