LVS+Keepalived负载均衡安装配置笔记

天堂1111

背景：
服务器环境：CentOS 6.4 x86_64
一个虚拟IP：
192.168.11.180
两台WEB服务器：
192.168.11.184
192.168.11.185
#安装LVS

yum -y install kernel-devel popt popt-devel libnl libnl-devel popt-static
ln -s /usr/src/kernels/2.6.32-431.20.3.el6.x86_64/ /usr/src/linux
wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz
tar zxf ipvsadm-1.26.tar.gz
cd ipvsadm-1.26
make && make install


#安装keeplived

wget http://www.keepalived.org/software/keepalived-1.2.13.tar.gz
tar zxf keepalived-1.2.13.tar.gz
cd keepalived-1.2.13
./configure --prefix=/usr/local/keepalived
make && make install
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
mkdir /etc/keepalived


#192.168.11.184 MASTER配置文件
vim /etc/keepalived/keepalived.conf

global_defs {
notification_email {
hongmingwei@pinganfang.com    #email 通知
}
notification_email_from hongmingwei@pinganfang.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS1# 设置lvs的id，在一个网络内应该是唯一的
}
vrrp_sync_group test {           #设置vrrp组
group {
loadbalance
}
}
vrrp_instance loadbalance {
state MASTER       #设置lvs的状态，报错MASTER和BACKUP两种，必须大写
interface eth0     #设置对外服务的接口
lvs_sync_daemon_inteface eth0   #设置lvs监听的接口
virtual_router_id 180                     #设置虚拟路由表示
priority 180            #设置优先级，数值越大，优先级越高
advert_int 5           #设置同步时间间隔
authentication {                    #设置验证类型和密码
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {                #设置lvs vip
192.168.11.180
}
}
virtual_server 192.168.11.180 80 {
delay_loop 6          #健康检查时间间隔
lb_algo rr               #负载均衡调度算法
lb_kind DR            #负载均衡转发规则
#persistence_timeout 20  #设置会话保持时间，对bbs等很有用
protocol TCP                #协议
real_server 192.168.11.184 80 {
weight 3                #设置权重
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.11.185 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}


#192.168.11.185 BACKUP配置文件：
vim /etc/keepalived/keepalived.conf

global_defs {
notification_email {
hongmingwei@pinganfang.com
}
notification_email_from hongmingwei@pinganfang.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS2
}
vrrp_sync_group test {
group {
loadbalance
}
}
vrrp_instance loadbalance {
state BACKUP
interface eth0
lvs_sync_daemon_inteface eth0
virtual_router_id 180
priority 150
advert_int 5
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.11.180
}
}
virtual_server 192.168.11.180 80 {
delay_loop 6
lb_algo rr
lb_kind DR
#persistence_timeout 20
protocol TCP
real_server 192.168.11.184 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.11.185 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}


#两个服务器上都添加下面脚本：
vim /etc/init.d/lvs_real

#!/bin/bash
# description: Config realserver lo and apply noarp
SNS_VIP=192.168.11.180
/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 Stoped"
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac
exit 0


#启动keepalived
/etc/init.d/keepalived start
#启动lvs
/etc/init.d/lvs_real start