yum install -y ipvsadm keepalived
cd /etc/keepalived
vim keepalived.conf
  10行：smtp_server 127.0.0.1
  12行：router_id LVS_01
  13-16行：删除
#vrrp热备份模块#
  17行：interface ens33
  19行（priority 100上方插入）：nopreempt
  27行：192.168.13.100
  28-29行：删除
#virtual虚拟服务器模块#
  31行：virtual_server 192.168.13.100 80 {
  34行：lb_kind DR
  35行：persistence_timeout 0
  36行：protocol TCP
  38行：real_server 192.168.13.20 80 {
  39行：weight 1
  40行：TCP_CHECK {
  41行：connect_port 80
  42行：connect_timeout 3
  43行：nb_get_retry 3
  44行：delay_before_retry 3
  45行：}
  46行：}
  47行及以下：38,46 co 46                #将上面9行节点服务器配置复制下来，改一下节点服务器IP地址即可
  56行：}                       #对应virtual_server 192.168.13.100 80的大括号
  56行以下：全部删除
vim /etc/sysctl.conf                  #关闭ip转发功能，并配置相关配置
  net.ipv4.ip_forward = 0
  net.ipv4.conf.all.send_redirects = 0
  net.ipv4.conf.default.send_redirects = 0
  net.ipv4.conf.ens33.send_redirects = 0
sysctl -p                       #重新加载内存中的配置（立即生效）
systemctl start keepalived                #启动keepalived高可用服务
ipvsadm-save > /etc/sysconfig/ipvsadm         #生成ipvsadm文件（必须先生成，才能启动ipvsadm）
systemctl start ipvsadm                 #启动ipvsadm服务
systemctl restart keepalived              #重启keepalived高可用服务
ipvsadm -ln                       #查看转发规则是否成功（博主成功配置后，显示如下）
  192.168.13.30:80             Route   1      0          0
  192.168.13.40:80             Route   1      0          0

yum install -y ipvsadm keepalived
cd /etc/keepalived/
#在负载均衡调度器（主）上操作，节省时间：scp keepalived.conf 192.168.13.20:`pwd`
vim keepalived.conf
  12行：router_id LVS_02
  16行：state BACKUP
  20行：priority 90
vim /etc/sysctl.conf                  #关闭ip转发功能，并配置相关配置
  net.ipv4.ip_forward = 0
  net.ipv4.conf.all.send_redirects = 0
  net.ipv4.conf.default.send_redirects = 0
  net.ipv4.conf.ens33.send_redirects = 0
sysctl -p                       #重新加载内存中的配置（立即生效）
systemctl start keepalived                #启动keepalived高可用服务
ipvsadm-save > /etc/sysconfig/ipvsadm         #生成ipvsadm文件（必须先生成，才能启动ipvsadm）
systemctl start ipvsadm                 #启动ipvsadm服务
systemctl restart keepalived              #重启keepalived高可用服务
ipvsadm -ln                       #查看转发规则是否成功（博主成功配置后，显示如下）
  192.168.13.30:80             Route   1      0          0
  192.168.13.40:80             Route   1      0          0