Linux下部署LVS(DR)+keepalived+Nginx负载均衡

架构部署 

LVS/keepalived(master):192.168.21.3 

LVS/keepalived(Slave):192.168.21.6 

Nginx1:192.168.21.4 

Nginx2:192.168.21.5 

VIP:192.168.21.10

1、安装ipvsadm、keepalived(Master/Slave) 

yum -y install keepalived ipvsadm 

2、修改keepalived.conf文件 

LVS_master

cd /etc/keepalived 

vi /deepalived 

 

! Configuration File for keepalived

global_defs {

   router_id master_201

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 100

    priority 151

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 123456

    }

    virtual_ipaddress {

        192.168.21.10

    }

}

virtual_server 192.168.21.10 80 {

    delay_loop 6

    lb_algo wrr

    lb_kind DR

#    persistence_timeout 50

    protocol TCP

    real_server 192.168.21.4 80 {

        weight 1

        TCP_CHECK {

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

            connect_port 80

        }

    }

    real_server 192.168.21.5 80 {

        weight 1

        TCP_CHECK {

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

            connect_port 80

        }

    }

}

LVS_Slave

! Configuration File for keepalived

global_defs {

   router_id slave_211

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 100

    priority 150

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass 123456

    }

    virtual_ipaddress {

        192.168.21.10

    }

}

virtual_server 192.168.21.10 80 {

    delay_loop 6

    lb_algo wrr

    lb_kind DR

#    persistence_timeout 50

    protocol TCP

    real_server 192.168.21.4 80 {

        weight 1

        TCP_CHECK {

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

            connect_port 80

        }

    }

    real_server 192.168.21.5 80 {

        weight 1

        TCP_CHECK {

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

            connect_port 80

        }

    }

}

 

3、Nginx端配置 

写一下lvs脚本 

#!/bin/bash

#

# Script to start LVS DR real server.

# description: LVS DR real server

#

.  /etc/rc.d/init.d/functions

VIP=192.168.21.10   #这里根据需要改成自己的VIP地址

host=`/bin/hostname`

case "$1" in

start)

       # Start LVS-DR real server on this machine.

        /sbin/ifconfig lo down

        /sbin/ifconfig lo 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

        /sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up

        /sbin/route add -host $VIP dev lo:0

;;

stop)

        # Stop LVS-DR real server loopback device(s).

        /sbin/ifconfig lo:0 down

        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

;;

status)

        # Status of LVS-DR real server.

        islothere=`/sbin/ifconfig lo:0 | grep $VIP`

        isrothere=`netstat -rn | grep "lo:0" | grep $VIP`

        if [ ! "$islothere" -o ! "isrothere" ];then

            # Either the route or the lo:0 device

            # not found.

            echo "LVS-DR real server Stopped."

        else

            echo "LVS-DR real server Running."

        fi

;;

*)

            # Invalid entry.

            echo "$0: Usage: $0 {start|status|stop}”

            exit 1

;;

esac

4、测试

Master

[root@text1 keepalived]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

TCP  192.168.21.10:80 wrr

  -> 192.168.21.4:80              Route   1      0          0         

  -> 192.168.21.5:80              Route   1      0          0

Slave

[root@omserver keepalived]# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn

TCP  192.168.21.10:80 wrr

  -> 192.168.21.4:80              Route   1      0          0         

  -> 192.168.21.5:80              Route   1      0          0