vim /etc/systemd/system/kubelet.service.d/10-kubeadm.conf

[Service]
EnvironmentFile=-/etc/kubernetes/kubelet-customized-args.conf
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
Environment="KUBELET_SYSTEM_PODS_ARGS=--max-pods 256 --pod-manifest-path=/etc/kubernetes/manifests"
Environment="KUBELET_NETWORK_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin --dynamic-config-dir=/etc/kubernetes/kubelet-config --v=3"
Environment="KUBELET_DNS_ARGS=--enable-controller-attach-detach=true --cluster-dns=172.26.0.10         --pod-infra-container-image=registry-vpc.cn-hangzhou.aliyuncs.com/acs/pause:3.2          --enable-load-reader         --cluster-domain=cluster.local --cloud-provider=external         --hostname-override=cn-hangzhou.172.16.214.136 --provider-id=cn-hangzhou.i-bp1jbs6mikeqdurclkzn"
Environment="KUBELET_AUTHZ_ARGS=--authorization-mode=Webhook --authentication-token-webhook=true --anonymous-auth=false --client-ca-file=/etc/kubernetes/pki/ca.crt"
Environment="KUBELET_CGROUP_ARGS=--cgroup-driver=systemd"
Environment="KUBELET_CERTIFICATE_ARGS=--tls-cipher-suites=TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_256_GCM_SHA384,TLS_RSA_WITH_AES_128_GCM_SHA256 --tls-cert-file=/var/lib/kubelet/pki/kubelet.crt --tls-private-key-file=/var/lib/kubelet/pki/kubelet.key --rotate-certificates=true --cert-dir=/var/lib/kubelet/pki"
ExecStart=
ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_SYSTEM_PODS_ARGS $KUBELET_NETWORK_ARGS $KUBELET_DNS_ARGS $KUBELET_AUTHZ_ARGS $KUBELET_CGROUP_ARGS $KUBELET_CERTIFICATE_ARGS $KUBELET_EXTRA_ARGS $KUBELET_CUSTOMIZED_ARGS
~                                                                                                                                                                                                                                    

增加如下字段

Environment="KUBELET_NODE_MAX_PODS=--max-pods=600"
ExecStart=/usr/bin/kubelet   $KUBELET_NODE_MAX_PODS

[root@k8s1 ~]# systemctl daemon-reload

[root@k8s1 ~]# systemctl restart kubelet