实现工具：haproxy+keepalived
haproxy.cfg的配置：
global
log 127.0.0.1 local2
chroot /var/lib/haproxy
pidfile /var/run/haproxy.pid
maxconn 4000
user haproxy
group haproxy
daemon
stats socket /var/lib/haproxy/stats
defaults
mode tcp
log global
timeout connect 10s
timeout client 1m
timeout server 1m
timeout check 10s
maxconn 3000
frontend kube-api
bind 0.0.0.0:6443
mode tcp
log global
default_backend kube-master
backend kube-master
balance source
server master01 10.10.5.84:6443 check inter 2000 fall 2
server master02 10.10.5.85:6443 check inter 2000 fall 2
server master03 10.10.5.92:6443 check inter 2000 fall 2
listen stats
mode http
bind 0.0.0.0:1080
stats enable
stats hide-version
stats uri /haproxyadmin?stats
stats realm Haproxy Statistics
stats auth admin:admin
stats admin if TRUE