摘要：! Configuration File for keepalivedglobal_defs { router_id keepalived1 #只是名字而已，辅节点改为keepalived2（两个名字一定不能一样）}vrrp_instance VI_1 { s
192.168.4.20 VIP虚拟地址192.168.4.21 keepalived1192.168.4.22 keepalived2网卡为 ens192
系统为Anolis8 龙蜥8
关闭防火墙
systemctl stop firewalld && systemctl disable firewalld主机1
192.168.4.21 keepalived1
安装
yum install -y keepalived配置文件备份
cp /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf.bak 编辑
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs { router_id keepalived1 #只是名字而已，辅节点改为keepalived2（两个名字一定不能一样）}vrrp_instance VI_1 { state MASTER #定义主还是备，备用的话写backup interface ens192 #VIP绑定接口 virtual_router_id 66 #整个集群的调度器一致（在同一个集群） priority 100 #（优先权）back改为50（50一间隔） advert_int 1 #发包 authentication { auth_type PASS #主备节点认证 auth_pass 1111 } virtual_ipaddress { 192.168.4.20/24 #VIP（自己网段的） }}主机2
192.168.4.22 keepalived2
安装软件
配置文件备份
! Configuration File for keepalivedglobal_defs { router_id keepalived2}vrrp_instance VI_1 { state BACKUP #设置为backup interface ens192 nopreempt #设置到back上面，不抢占资源 virtual_router_id 66 priority 50 #辅助改为50 advert_int 1 #检测间隔1s authentication { auth_type PASS auth_pass 1111 #认证类型和密码主备一样，要不然无法互相认证 } virtual_ipaddress { 192.168.4.20/24 #抢占的VIP也一样 }}启动服务
在两台主机上安装nginx
yum install nginx -ysystemctl enable --now nginx两台主机显示不同网页
主机1
echo "keepalived1 nginx" > /usr/share/nginx/html/index.html主机2
echo "keepalived2 nginx" > /usr/share/nginx/html/index.html两台主机均编写脚本
vi /etc/keepalived/check_nginx.sh
通过端口监听判断业务是否正常，几乎适用于所有业务，如MQ、nginx、OBProxy等等
#!/bin/bash# 检查80端口是否有监听if ss -tuln | grep -q ':80\b'; then exit 0 # 检测成功，返回0else exit 1 # 检测失败，返回1fi配置keepalived1
192.168.4.21 keepalived1
执行权限
chmod +x /etc/keepalived/check_nginx.sh编辑配置文件
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs { router_id keepalived1 #只是名字而已，辅节点改为keepalived2（两个名字一定不能一样）}vrrp_script check_nginx { script "/etc/keepalived/check_nginx.sh" interval 2 #每2秒执行一次}vrrp_instance VI_1 { state MASTER #定义主还是备，备用的话写backup interface ens192 #VIP绑定接口 virtual_router_id 66 #整个集群的调度器一致（在同一个集群） priority 100 #（优先权）back改为50（50一间隔） advert_int 1 #发包 authentication { auth_type PASS #主备节点认证 auth_pass 1111 } virtual_ipaddress { 192.168.4.20/24 #VIP（自己网段的） } track_script { check_nginx }}配置keepalived2
192.168.4.22 keepalived2
执行权限
! Configuration File for keepalivedglobal_defs { router_id keepalived2}vrrp_script check_nginx { script "/etc/keepalived/check_nginx.sh" interval 2 #每2秒执行一次}vrrp_instance VI_1 { state BACKUP #设置为backup interface ens192 nopreempt #设置到back上面，不抢占资源 virtual_router_id 66 priority 50 #辅助改为50 advert_int 1 #检测间隔1s authentication { auth_type PASS auth_pass 1111 #认证类型和密码主备一样，要不然无法互相认证 } virtual_ipaddress { 192.168.4.20/24 #抢占的VIP也一样 } track_script { check_nginx }}改完配置文件两台主机都需要重启keepalived服务
关闭主机1的nginx服务，VIP自动漂移到主机2，启动主机1的nginx服务，VIP漂回来配置keepalived1
192.168.4.21 keepalived1
编辑配置文件
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs { router_id keepalived1 #只是名字而已，辅节点改为keepalived2（两个名字一定不能一样）}vrrp_script check_nginx { script "/etc/keepalived/check_nginx.sh" interval 2 #每2秒执行一次}vrrp_instance VI_1 { state MASTER #定义主还是备，备用的话写backup interface ens192 #VIP绑定接口 virtual_router_id 66 #整个集群的调度器一致（在同一个集群） priority 100 #（优先权）back改为50（50一间隔） advert_int 1 #发包 authentication { auth_type PASS #主备节点认证 auth_pass 1111 } unicast_src_ip 192.168.4.21 #本机ip unicast_peer { 192.168.4.22 #其他机器ip，可多个 } virtual_ipaddress { 192.168.4.20/24 #VIP（自己网段的） } track_script { check_nginx }}配置keepalived2
192.168.4.22 keepalived2
编辑配置文件
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalivedglobal_defs { router_id keepalived2}vrrp_script check_nginx { script "/etc/keepalived/check_nginx.sh" interval 2 #每2秒执行一次}vrrp_instance VI_1 { state BACKUP #设置为backup interface ens192 nopreempt #设置到back上面，不抢占资源 virtual_router_id 66 priority 50 #辅助改为50 advert_int 1 #检测间隔1s authentication { auth_type PASS auth_pass 1111 #认证类型和密码主备一样，要不然无法互相认证 } unicast_src_ip 192.168.4.22 #本机ip unicast_peer { 192.168.4.21 #其他机器ip，可多个 } virtual_ipaddress { 192.168.4.20/24 #抢占的VIP也一样 } track_script { check_nginx }} 来源：王忘杰
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