下载keeplived
https://www.keepalived.org/download.html

解压、编译、安装
[root@jbggapp2 soft]# tar -xvf keepalived-1.4.5.tar.gz
[root@jbggapp2 keepalived-1.4.5]#./configure --prefix=/u01/keepalived

若出现如下报错：undefined reference to `OPENSSL_init_ssl’，可带上openssl lib路径：

[root@jbggapp2 soft]# LDFLAGS=“$LDFAGS -L /usr/local/ssl/lib/” ./configure --prefix=/u01/keepalived --sysconf=/etc

启动
[root@jbggapp2 keepalived]# cp /u01/keepalived/sbin/keepalived /usr/sbin/keepalived
[root@jbggapp2 keepalived]# cp /soft/keepalived-1.4.5/keepalived/etc/init.d/keepalived /etc/init.d/
[root@jbggapp2 keepalived]# chkconfig --add keepalived
[root@jbggapp2 keepalived]# service start keepalived

配置

[root@jbggapp2 ~]# more /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs {
#   notification_email {
#     acassen@firewall.loc
#     failover@firewall.loc
#     sysadmin@firewall.loc
#   }
#   notification_email_from Alexandre.Cassen@firewall.loc
#   smtp_server 192.168.200.1
#   smtp_connect_timeout 30
#   router_id LVS_DEVEL
#   vrrp_skip_check_adv_addr
#   vrrp_strict
#   vrrp_garp_interval 0
#   vrrp_gna_interval 0
}
vrrp_script check_nginx {script "/u01/keepalived/check_nginx.sh" #心跳执行的脚本，检测nginx是否启动interval 2                          #（检测脚本执行的间隔，单位是秒）weight 2                            #权重
}vrrp_instance VI_1 {state MASTERinterface eth0virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 111123456}track_script {check_nginx            #（调用检测脚本）}virtual_ipaddress {205.11.168.92}
}

参考：
https://blog.csdn.net/weixin_40816738/article/details/125258576
https://libaineu2004.blog.csdn.net/article/details/79551455?spm=1001.2101.3001.6650.18&utm_medium=distribute.pc_relevant.none-task-blog-2_defaultBlogCommendFromBaidu_{Rate-18-79551455-blog-103702497.pc_relevant_multi_platform_whitelistv3&depth_1-utm_source=distribute.pc_relevant.none-task-blog-2}default_{BlogCommendFromBaidu}Rate-18-79551455-blog-103702497.pc_relevant_multi_platform_whitelistv3&utm_relevant_index=19

https://blog.csdn.net/u012486840/article/details/121030669