Deploy LVs (DR) +keepalived+nginx load balancer under Linux

Schema deployment

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 : 192.168.21.101, installing Ipvsadm, keepalived (Master/slave)yum-y Install keepalived ipvsadm2. Modify the keepalived.conf fileLvs_masterCd/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 side Configuration write the LVs script

#!/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 "$" in

Start

# Start LVS-DR Real Server on the 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: $ {start|status|stop}"

Exit 1

;;

Esac

4. Testing

Master

[Email protected] 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

[Email protected] 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

Deploy LVs (DR) +keepalived+nginx load balancer under Linux