根据文档在Oracle VM上实现，但是故障转移不起作用。
https://github.com/justmeandopensource/kubernetes/tree/master/kubeadm-ha-multi-master
Role FQDN IP OS RAM CPU
Load Balancer loadbalancer.example.com172.16.16.100 Ubuntu 20.04 1G 1
Master kmaster1.example.com 172.16.16.101 Ubuntu 20.04 2G 2
Master kmaster2.example.com 172.16.16.102 Ubuntu 20.04 2G 2
Worker kworker1.example.com 172.16.16.201 Ubuntu 20.04 1G 1
Below are the details before shutting down the kmaster1 and after.
root@kmaster2:~# kubectl get nodes
NAME STATUS ROLES AGE VERSION
kmaster1 Ready master 22h v1.19.2
kmaster2 Ready master 22h v1.19.2
kworker1 Ready <none> 22h v1.19.2
===>shutdown now on master1-========
root@kmaster2:~# kubectl get nodes
Error from server: etcdserver: request timed out
root@kmaster2:~# kubectl get nodes
Error from server: etcdserver: request timed out
root@kmaster2:~# ping 172.16.16.100
PING 172.16.16.100 (172.16.16.100) 56(84) bytes of data.
64 bytes from 172.16.16.100: icmp_seq=1 ttl=64 time=0.580 ms
64 bytes from 172.16.16.100: icmp_seq=2 ttl=64 time=0.716 ms
64 bytes from 172.16.16.100: icmp_seq=3 ttl=64 time=1.08 ms
^C
--- 172.16.16.100 ping statistics ---
3 packets transmitted, 3 received, 0% packet loss, time 2053ms
rtt min/avg/max/mdev = 0.580/0.792/1.081/0.211 ms
root@kmaster2:~# kubectl get nodes
Unable to connect to the server: net/http: TLS handshake timeout
root@kmaster2:~# kubectl get nodes
Unable to connect to the server: net/http: TLS handshake timeout