LVS下keepalived

keepalived：一个master（主的）和多个dackup（备用的），同一时刻只有一个vip（在master），当master宕机后，会在backup中选举出来一个master。
vrrp协议：虚拟路由冗余协议，实现路由器的高可用
对外出口只有一个路由器

yum install openssl-devel -y
yum install libnl libnl-devel -y

yum insstall libnetlink-devel-* 

./configure --with-init=SYSV --prefix=/usr/local/keepalived
SYSV启动脚本
prefix=/usr/local 安装路径

yum install gcc -y
  27  yum install ipvsadm -y
   28  chmod +x /usr/local/keepalived/etc/rc.d/init.d/keepalived ---->启动脚本
   29  ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
   30  ln -s /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
   31  ln -s /usr/local/keepalived/etc/keepalived/ /etc/
   32  ln -s /usr/local/keepalived/sbin/keepalived /sbin
作连接可以方便启动

 vim /etc/keepalived/keepalived.conf 


 1  Configuration File for keepalived
  2 
  3 global_defs {
  4    notification_email {
  5      root@localhost
  6    }
 7    notification_email_from keepalived@localhost
  8    smtp_server 127.0.0.1
  9    smtp_connect_timeout 30
 10    router_id LVS_DEVEL
 11    vrrp_skip_check_adv_addr
 12    #vrrp_strict
 13    vrrp_garp_interval 0
 14    vrrp_gna_interval 0
 15 }
16 
 17 vrrp_instance VI_1 {
 18     state MASTER      备用改为BAKEUP
 19     interface eth1
 20     virtual_router_id 53  冗余节点
 21     priority 100 权重     备用权重小于100
 22     advert_int 1
 23     authentication {
 24         auth_type PASS
 25         auth_pass 1111
 26     }
 27     virtual_ipaddress {
 28         172.25.2.100
 29     }
 30 }
 32 virtual_server 172.25.2.100 80 {
 33     delay_loop 3
 34     lb_algo rr
 35     lb_kind DR
 36     #persistence_timeout 50  保持连接（保持50s连接）
 37     protocol TCP
 38 
 39    real_server 172.25.2.2 80 {
 40         TCP_CHECK {
 41         weight 1
 42             connect_timeout 3
 43             retry 3
 44             delay_before_retry 3
 45         }
 46     }
 47     real_server 172.25.2.3 80 {
 48         TCP_CHECK {
 49         weight 1
 50             connect_timeout 3
 51             retry 3
 52             delay_before_retry 3
 53         }
 54     }
 56 }

那台主机时master那台主机连接vip 

yum install mailx -y 发送邮件时需要接受或者发送的软件