下載wget http://keepalived.org/software/keepalived-2.0.6.tar.gz

mkdir /usr/local/keepalived/

tar  -zxvf  keepalived-2.0.6.tar.gz  -C  /usr/local/keepalived

cd  /usr/local/keepalived/keepalived-2.0.6
./configure

make
make install
cp -r keepalived  /etc/init.d/keepalived
mkdir  /etc/keepalived/
cd /usr/local/keepalived/keepalived-2.0.6/keepalived/etc/keepalived
cp  keepalived.conf  /etc/keepalived/
cd /usr/local/keepalived/keepalived-2.0.6/keepalived/etc/sysconfig/
cp keepalived  /etc/sysconfig/keepalived
cp /usr/local/keepalived/keepalived-2.0.6/bin/keepalived /usr/sbin

vi  /etc/keepalived/keepalived.conf   #以下是配置的內容

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 51
    priority 101
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.67.100
    }
}

以上修改瞭如下三項
1.
priority 101    #Master值要大於Bakcup
2.更改網路介面 
vrrp_instance VI_1 中interface:ens33(ip addr命令中的網路) 
3.
192.168.67.100 是虛擬ip

啟動keepalived
service  keepalived  start或者systemctl start keepalived

備用排程伺服器 只有一項不同
 priority 100
同樣配置完畢後啟動keepalived

注意:
#vrrp_strict      #這個註釋掉，否則可能造成物理機的瀏覽器無法訪問應用

啟動keepalived  
service keepalived start
設定開機自啟動
systemctl  enable  keepalived.service

參考https://blog.csdn.net/qq_42794720/article/details/81736669