centos 6.4+LVS+keepalived+nginx简单负载均衡实验

unijun

　　由于测试环境有限，在虚拟机中测试
　　一、环境：
　　CentOs 6.4 LVS Keepalived Nginx
　　

　　主服务器(ServerA)：192.168.1.251
　　从服务器(ServerB)：192.168.1.252
　　VIP：192.168.1.254
　　

　　二、步骤
　　1、主服务器ServerA安装LVS keepalived
　　[root@ServerA /]# yum -y install ipvsadm
[root@ServerA /]# yum -y install keepalived
　　

　　[root@ServerA /]# cd /etc/init.d/
[root@ServerA init.d]# vi ipvs
　　#!/bin/bash
# description: Config realserver lo and apply noarp
　　
VIP=192.168.1.254
. /etc/rc.d/init.d/functions
case "$1" in
start)
       ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
       /sbin/route add -host $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 $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 Stoped"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit 1
　　esac
　　exit 0
　　[root@ServerA init.d]#chmod a+x ipvs
　　

　　[root@ServerA /]# cd /etc/keepalived/
[root@ServerA keepalived]# vi keepalived.conf
　　! Configuration File for keepalived
　　global_defs {
   router_id LVS_Master
}
　　vrrp_instance VI_1 {
    state MASTER
    interface eth2
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.254
    }
}
　　virtual_server 192.168.1.254 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 10
    protocol TCP
　　real_server 192.168.1.251 80 {
        weight 1
       TCP_CHECK {
         connect_port 80
         connect_timeout 30
         nb_get_retry 3
         delay_before_retry 3
         }
    }
    real_server 192.168.1.252 80 {
        weight 1
       TCP_CHECK {
         connect_port 80
         connect_timeout 30
         nb_get_retry 3
         delay_before_retry 3
         }
    }
　　}
　　

　　[root@ServerA /]#/etc/init.d/ipvs start
　　[root@ServerA /]#service keepalived start
　　[root@ServerA /]# ip add
1: lo:  mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet 192.168.1.254/32 brd 192.168.1.254 scope global lo:0
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth2:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:50:56:2d:7d:d7 brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.251/24 brd 192.168.1.255 scope global eth2
    inet 192.168.1.254/32 scope global eth2
    inet6 fe80::250:56ff:fe2d:7dd7/64 scope link
       valid_lft forever preferred_lft forever
　　[root@ServerA /]# ipvsadm -ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.1.254:80 wrr persistent 10
  -> 192.168.1.251:80             Local   1      0          0         
  -> 192.168.1.252:80             Route   1      0          0
　　

　　

　　2、从服务器ServerB安装LVS keepalived
　　[root@ServerB /]# yum -y install ipvsadm
[root@ServerB /]# yum -y install keepalived
　　

　　[root@ServerB /]# cd /etc/init.d/
[root@ServerB init.d]# vi ipvs
　　#!/bin/bash
# description: Config realserver lo and apply noarp
　　
VIP=192.168.1.254
. /etc/rc.d/init.d/functions
case "$1" in
start)
       ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP
       /sbin/route add -host $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 $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 Stoped"
       ;;
*)
       echo "Usage: $0 {start|stop}"
       exit 1
　　esac
　　exit 0
　　[root@ServerB init.d]#chmod a+x ipvs
　　

　　[root@ServerB /]# cd /etc/keepalived/
[root@ServerB keepalived]# vi keepalived.conf
　　! Configuration File for keepalived
　　global_defs {
   router_id LVS_Backup
}
　　vrrp_instance VI_1 {
    state BACKUP
    interface eth3
    virtual_router_id 51
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.1.254
    }
}
　　virtual_server 192.168.1.254 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 10
    protocol TCP
　　real_server 192.168.1.251 80 {
        weight 1
       TCP_CHECK {
         connect_port 80
         connect_timeout 30
         nb_get_retry 3
         delay_before_retry 3
         }
    }
    real_server 192.168.1.252 80 {
        weight 1
       TCP_CHECK {
         connect_port 80
         connect_timeout 30
         nb_get_retry 3
         delay_before_retry 3
         }
    }
　　}
　　

　　[root@ServerB /]#/etc/init.d/ipvs start
　　[root@ServerB /]#service keepalived start
　　[root@ServerB /]# ip add
1: lo:  mtu 16436 qdisc noqueue state UNKNOWN
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
    inet 192.168.1.254/32 brd 192.168.1.254 scope global lo:0
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: eth3:  mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:50:56:26:eb:9b brd ff:ff:ff:ff:ff:ff
    inet 192.168.1.252/24 brd 192.168.1.255 scope global eth3
    inet6 fe80::250:56ff:fe26:eb9b/64 scope link
       valid_lft forever preferred_lft forever