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kubeadm生成的token过期后，集群增加节点
source link: https://tangxusc.github.io/2019/03/kubeadm%E7%94%9F%E6%88%90%E7%9A%84token%E8%BF%87%E6%9C%9F%E5%90%8E%E9%9B%86%E7%BE%A4%E5%A2%9E%E5%8A%A0%E8%8A%82%E7%82%B9/
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kubeadm生成的token过期后，集群增加节点
重新生成token(默认token24小时后过期)
kubeadm token create TOKEN TTL EXPIRES USAGES DESCRIPTION EXTRA GROUPS 36iajs.t016zpxbyqdmivcq 19h 2018-07-04T12:48:32+08:00 authentication,signing The default bootstrap token generated by 'kubeadm init'. system:bootstrappers:kubeadm:default-node-token获取ca证书sha256编码hash值
openssl x509 -pubkey -in /etc/kubernetes/pki/ca.crt | openssl rsa -pubin -outform der 2>/dev/null | openssl dgst -sha256 -hex | sed 's/^.* //'节点加入集群
kubeadm join <节点IP>:6443 --token 36iajs.t016zpxbyqdmivcq --discovery-token-ca-cert-hash sha256:19246ce11ba3fc633fe0b21f2f8aaaebd7df9103ae47138dc0dd615f61a32d99
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