lvs+keepalived负载均衡

创建脚本 /etc/init.d/realserver


#gedit /etc/init.d/myservice
# chkconfig: 2345 10 90
# description: myservice ...
SNS_VIP&＃61;10.28.0.130
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/route add -host $SNS_VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>$1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Start Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit0


 




解释
SNS_VIP&＃61;10.28.0.130       #定义VIP变量
. /etc/rc.d/init.d/functions     #导脚本库
case "$1" in                     #case语句 $1传递给该shell脚步的第一个参数
start)
ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP  #设置lo: 0 VIP netmask 及广播
/sbin/route add -host $SNS_VIP dev lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
sysctl -p >/dev/null 2>&1
echo "RealServer Start OK"
;;
stop)
ifconfig lo:0 down
route del $SNS_VIP >/dev/null 2>$1
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "RealServer Start Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit0


给脚本赋予权限
chmod 750 realserver
chkconfig realserver on #设置开机自启动
service realserver start




搭建负载均衡
1.安装ipvsadm keepalived
如果是centos内核2.6以上&＃xff0c;自带ipvsadm
yum -y install ipvsadm keepalived
配置keepalived
> /etc/keepalived/keepalived.conf #覆盖掉原来的配置文件
vim /etc/keepalived/keepalived.conf


! Configuration File for keepalived
global_defs {
 # notification_email {
 #   acassen&＃64;firewall.loc
 #   failover&＃64;firewall.loc
 #   sysadmin&＃64;firewall.loc
 # }
 # otification_email_from Alexandre.Cassen&＃64;firewall.loc
 # mtp_server 192.168.200.1
 # mtp_connect_timeout 30
  router_id LVS_DEVEL
}


vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        10.28.0.130
   #    192.168.200.17
   #   192.168.200.18
    }
} 
virtual_server 10.28.0.130 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 0
    protocol TCP


    real_server  10.28.0.133 80 {
        weight 1
        TCP_CHECK {            
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
connect_port 80
        }
    }
   real_server  10.28.0.134 80 {
        weight 1
         TCP_CHECK {            
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
connect_port 80
        }
    }
}


解释
global_defs {
   router_id LVS_DEVEL_1   //本路由器&＃xff08;服务器&＃xff09;的名称
}
vrrp_instance VI_1 {      //定义vrrp热备实例
    state MASTER       //热本状态&＃xff0c;MASTER表示主服务器  备份服务器设置为BACKUP
    interface eth0       //承载vip的物理端口
    virtual_router_id 51   //虚拟路由器的ID号&＃xff0c;每个热备组保持一致
    priority 150         //优先级&＃xff0c;数值越大优先级越高&＃xff0c;这里应该主服务器高于辅助的 BACKUP可以设置的比主服务器小
    advert_int 1         //通告间隔秒数&＃xff08;心跳频率&＃xff09;
    authentication {      //认证信息&＃xff0c;每个热备组保持一致
        auth_type PASS   //认证类型
        auth_pass 1111   //认证密码
    }
    virtual_ipaddress {     //指定漂移地址&＃xff08;vip&＃xff09;&＃xff0c;可以有多个
        192.168.1.198
    }
}
virtual_server 192.168.1.198 80 {    //虚拟服务器地址&＃xff08;vip&＃xff09;、端口
    delay_loop 6                 //健康检查间隔时间
    lb_algo rr                     //轮询&＃xff08;rr&＃xff09;调度算法
    lb_kind DR                   //直接路由模式&＃xff08;DR&＃xff09;
protocol TCP                  //应用服务采用的模式是TCP模式
 
    real_server 192.168.1.191 80 {     //第一个Web节点的地址、端口
        weight 1                    //节点的权重
        TCP-CHECK {                 //健康检查方式
            connect_timeout 3        //连接超时&＃xff08;秒&＃xff09;
            nb_get_retry 3            //重试次数
            delay_before_retry 3       //重试间隔&＃xff08;秒&＃xff09;
            connect_port 80          //检查的目标端口
    }
}
    real_server 192.168.1.192 80 {       //第二个Web节点
        weight 1
        TCP-CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
    }
}
}
启动keepalived




service keepalived start
查看启动日志


tail -f /var/log/messages

访问10.28.0.130