keepalived最初专为LVS设计用来监控LVS集群系统中各个节点的状态，后来加入VRRP功能。因此也可以做nginx，haproxy，mysql的高可用。

VRRP：虚拟路由器冗余协议，解决静态路由单点故障。

通过竞选协议来实现虚拟路由器的功能，所有的协议报文通过ip多播（多播地址224.0.0.18），虚拟路由器的vrid对外的MAC地址00-00-5e-00-01-vrid.master会一直发VRRP广告包，如果BACKUP收不到广播包，会自己配置vip起服务。

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安装keepalivedyum install keepalived -y

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalivedglobal_defs { notification_email { lmkmike#qq.com}notification_email_from haproxy-ha@qq.comsmtp_server 192.168.200.1smtp_connect_timeout 30router_id LV-master #每一台keepalived不一样

}

vrrp_instance VI_1 {

state MASTER #角色 另外改BACKUPinterface eth0 #网卡virtual_router_id 51 #不能重复priority 150 #权重 另外改100advert_int 1 #检查时间默认1sauthentication { auth_type PASSauth_pass haproxy_ha}virtual_ipaddress { 192.168.56.10/24}

}

vrrp_instance VI_2 {

state BACKUP #角色 另外改MASTERinterface eth0 #网卡virtual_router_id 60 #不能重复priority 150 #权重 另外改100advert_int 1 #检查时间默认1sauthentication { auth_type PASSauth_pass haproxy_ha}virtual_ipaddress { 192.168.56.11/24}}

virtual_server 192.168.56.10 80 {

delay_loop 6lb_algo wrrlb_kind DRnat_mask 255.255.255.0persistence_timeout 300protocol TCP

real_server 192.168.56.100 80 {    weight 1    TCP_CHECK {        connect_timeout 3        nb_get_retry 3        delay_before_retry 3        connect_port 80    }}    real_server 192.168.56.21 80 {    weight 1    TCP_CHECK {        connect_timeout 3        nb_get_retry 3        delay_before_retry 3        connect_port 80    }}}

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RS要配置VIP和抑制ARP其他节点绑定vipifconfig lo:0 192.168.56.10/32 up抑制ARPecho 1 >/proc/sys/net/ipv4/conf/lo/arp_ignoreecho 2 >/proc/sys/net/ipv4/conf/lo/arp_announceecho 1 >/proc/sys/net/ipv4/conf/all/arp_ignoreecho 2 >/proc/sys/net/ipv4/conf/all/arp_announce #############################################################启动keepalivedservice keepalived start

查看lvs当前链接的状态

ipvsadm -lnc

上线RS时通过修改keepalived.cnf后优雅重启/etc/init.d/keepalived reload