部署lvs+keepalived

lijm1522

　　1.总共需要四台机器，五个ip, 两台机器作为负载均衡director，两台机器作为real server, 一人ip作为虚拟ip,供外网用。
　　2.部署director master:
　　a. 安装keepalived：yum install keepalived
　　b.安装ipvs: yum install ipvsadm
　　c.配置keepalived:
　　cd /etc/keepalived/
　　vi keepalived.conf
　　内容如下：
　　! Configuration File for keepalived
vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id 46
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass kevin_kocla
    }
    virtual_ipaddress {
       192.168.77.142
    }
}
　　virtual_server 192.168.77.142 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    persistence_timeout 3600
    protocol TCP
　　real_server 192.168.77.42 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 30
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
　　real_server 192.168.77.44 80 {
        weight 2
        TCP_CHECK {
            connect_timeout 30
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}
其中192.168.77.142为虚拟ip.
　　3.部署director backup:
　　方法同2，整个配置文件拷过来修改，配置文件中
　　state MASTER 改为：state BACKUP
　　priority 100 改为：priority 80
　　4.部署real server, 在/etc/init.d目录下增加lvsrs文件，并赋予755权限，lvsrs内容如下：
　　#!/bin/bash
#description : Start Real Server
VIP=192.168.77.142
. /etc/rc.d/init.d/functions
case "$1" in
start)
echo " Start LVS of Real Server "
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
    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
    ;;
     stop)
/sbin/ifconfig lo:0 down
    echo "close LVS Director server"
    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 "Usage: $0 {start|stop}"
    exit 1
esac
注意在windows环境下编辑，在linux上有可以不能执行。
　　5. 部署另一台 real server.
　　6. 依次启动：
　　director master:    service keepalived start
　　director backup:   service keepalived start
　　real server 1 :       service lvsrs start
　　rela server 2:        service lvsrs start
　　7.测试访问。
　　可能用到命令：
　　ip add
　　ip add list