1.删除etcd节点

cd /root/etcd-v3.4.13-linux-amd64
cp etcd* /usr/local/bin

# 查看etcd节点
[root@master etcd-v3.4.13-linux-amd64]# ETCDCTL_API=3 etcdctl --endpoints 127.0.0.1:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert  /etc/kubernetes/pki/etcd/server.crt --key  /etc/kubernetes/pki/etcd/server.key member list
9754d4208fa9e54b, started, master, https://192.168.1.10:2380, https://192.168.1.10:2379, false
b3688cea7fb0bfd6, started, pod1, https://192.168.1.11:2380, https://192.168.1.11:2379, false

# 找到pod1对应的hash值并删除
[root@master etcd-v3.4.13-linux-amd64]# ETCDCTL_API=3 etcdctl --endpoints 127.0.0.1:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert /etc/kubernetes/pki/etcd/server.crt --key /etc/kubernetes/pki/etcd/server.key member remove b3688cea7fb0bfd6
Member b3688cea7fb0bfd6 removed from cluster cbd4e4d0a63d294d

# 查看
[root@master etcd-v3.4.13-linux-amd64]# ETCDCTL_API=3 etcdctl --endpoints 127.0.0.1:2379 --cacert /etc/kubernetes/pki/etcd/ca.crt --cert  /etc/kubernetes/pki/etcd/server.crt --key  /etc/kubernetes/pki/etcd/server.key member list
9754d4208fa9e54b, started, master, https://192.168.1.10:2380, https://192.168.1.10:2379, false

2.etcd节点重新加入k8s

# 1.加入集群命令：master上执行
[root@master etcd-v3.4.13-linux-amd64]# kubeadm token create --print-join-command
kubeadm join 192.168.1.20:16443 --token 2q0q3r.kmd36rm0vuuc1kcv     --discovery-token-ca-cert-hash sha256:6e220a97f3d79d0b53b5ac18979dcfacdfb5da5ce0629017b745a8a4df162d27

# 2.master 执行：
[root@master etcd-v3.4.13-linux-amd64]# kubectl delete nodes pod1
node "pod1" deleted

# 3.pod1上执行，被删除etcd的节点上执行
[root@pod1 ~]# kubeadm reset

# 4.将master上kubernetes证书传到pod1
[root@master pki]# scp ca.crt ca.key sa.key sa.pub front-proxy-ca.crt front-proxy-ca.key pod1:/etc/kubernetes/pki/
ca.crt                                                                                                                                                                                                                                                             100% 1066   498.4KB/s   00:00    
ca.key                                                                                                                                                                                                                                                             100% 1679     1.5MB/s   00:00    
sa.key                                                                                                                                                                                                                                                             100% 1675     1.6MB/s   00:00    
sa.pub                                                                                                                                                                                                                                                             100%  451   553.5KB/s   00:00    
front-proxy-ca.crt                                                                                                                                                                                                                                                 100% 1078     1.1MB/s   00:00    
front-proxy-ca.key

[root@pod1 ~]# cd /etc/kubernetes/pki/

[root@master etcd]# scp ca.crt ca.key pod1:/etc/kubernetes/pki/etcd/
ca.crt                                                                                                                                                                                                                                                             100% 1058   921.3KB/s   00:00    
ca.key  

# 在pod1上执行如下命令，把节点加入k8s集群，充当控制节点：
[root@pod1 pki]#kubeadm join 192.168.1.20:16443 --token 2q0q3r.kmd36rm0vuuc1kcv --discovery-token-ca-cert-hash sha256:6e220a97f3d79d0b53b5ac18979dcfacdfb5da5ce0629017b745a8a4df162d27 --control-plane

[root@master etcd]# kubectl get nodes
NAME     STATUS   ROLES                  AGE     VERSION
master   Ready    control-plane,master   4d2h    v1.20.7
pod1     Ready    control-plane,master   54s     v1.20.7
pod2     Ready    <none>                 3d14h   v1.20.7