Failed to connect to API Server “192.168.31.197:6443“: Get https://192.168.31.197:6443/api/v1/namesp

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本文介绍了解决Kubernetes集群中节点加入失败的问题，主要针对连接API Server失败及kubelet服务启动异常的情况，通过调整iptables规则及配置kubelet来解决。

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node加入的时候出现这个错误：
	Failed to connect to API Server "192.168.31.197:6443": Get https://192.168.31.197:6443/api/v1/namespaces/kube-public/configmaps/cluster-info?timeout=10s: dial tcp 192.168.31.197:6443: connect: no route to host
是因为telnet的问题(首先排除下是不是因为token过期的问题，再来看是不是telnet的问题，也就是iptables建立一个防火墙)
解决方案:
		$ sudo iptables -L INPUT --line-numbers
找到关于:
		11 REJECT all -- 0.0.0.0/0 0.0.0.0/0 reject-with icmp-host-prohibited
这一条，然后我们这条删除掉就好了
		$ sudo iptables -D INPUT 11//注意这个11，就是你的line-numbers
然后，如果遇到你的kubelet起不来的话，
首先:
	$ systemctl status kubelet.service
		● kubelet.service - kubelet: The Kubernetes Node Agent
   			Loaded: loaded (/lib/systemd/system/kubelet.service; enabled; vendor preset: enabled)
  			Drop-In: /etc/systemd/system/kubelet.service.d
           									└─10-kubeadm.conf
		    Active: activating (auto-restart) (Result: exit-code) since 四 2020-11-26 19:33:31 CST; 5s ago
			Docs: https://kubernetes.io/docs/home/
			Process: 20503 ExecStart=/usr/bin/kubelet (code=exited, status=255)
			Main PID: 20503 (code=exited, status=255)
			11月 26 19:33:31 node-virtual-machine systemd[1]: kubelet.service: Unit entered failed state.
			11月 26 19:33:31 node-virtual-machine systemd[1]: kubelet.service: Failed with result 'exit-code'.
			Warning: kubelet.service changed on disk. Run 'systemctl daemon-reload' to reload units.
			node@node-virtual-machine:~$ cd /etc/systemd/system/kubelet.service.d/
	然后可以用:journalctl -f -u kubelet.service//进行详细的观察错误详情
	如果发现了这个错误:
			failed to run Kubelet: failed to create kubelet: misconfiguration: kubelet cgroup driver: "cgroupfs" is different from docker cgroup driver: "systemd"
那么第一步:
	1./etc/systemd/system/kubelet.service.d/10-kubeadm.conf
查看这个10-kubeadm.conf存不存在，如果不存在，那么直接创建一个:内容是
			# Note: This dropin only works with kubeadm and kubelet v1.11+
			[Service]
			Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.conf --kubeconfig=/etc/kubernetes/kubelet.conf"
			Environment="KUBELET_CONFIG_ARGS=--config=/var/lib/kubelet/config.yaml"
			# This is a file that "kubeadm init" and "kubeadm join" generates at runtime, populating the KUBELET_KUBEADM_ARGS variable dynamically
			EnvironmentFile=-/var/lib/kubelet/kubeadm-flags.env
			# This is a file that the user can use for overrides of the kubelet args as a last resort. Preferably, the user should use
			# the .NodeRegistration.KubeletExtraArgs object in the configuration files instead. KUBELET_EXTRA_ARGS should be sourced from this file.
			EnvironmentFile=-/etc/default/kubelet
			ExecStart=
			ExecStart=/usr/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_KUBEADM_ARGS $KUBELET_EXTRA_ARGS
然后剩下的就是:
kubectl join了
如果这个时候报错，那么就在:
			/var/lib/kubelet/下
创建kubeadm-flags.env文件
内容是:
			KUBELET_KUBEADM_ARGS="--cgroup-driver=systemd --network-plugin=cni –pod-infra-container-image=k8s.gcr.io/pause:3.1"
那么这样就解决了