LVS+keepalived
OS: Centos 6.4 Bit64
Lvs vip: 172.16.10.188
LvsKeepalived –master:172.16.10.160
Lvskeepalived –backup: 172.16.10.161
realserverWeb1:172.16.10.162
realserverWeb2:172.16.10.163
软件：ipvsadm keepalived
Lvs Keepalived –maste和Lvs keepalived –backup安装
一.ln -s/usr/src/kernels/2.6.32-358.6.2.el6.x86_64/ /usr/src/linux 和内核结合
rpm -ivh ipvsadm-1.25-9.el6.x86_64.rpm
/etc/rc.d/init.d/ipvsadmrestart
二.
三.wget http://www.keepalived.org/software/keepalived-1.2.6.tar.gz
四.tar zxvf keepalived-1.2.6.tar.gz
五.cd keepalived-1.2.6
./configure --prefix=/usr/local/keepalived
六.make -j 2 && make install 二个CPU编译
七.
八.将keepalived做成启动脚务，方便管理:
cp/usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp/usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp/usr/local/keepalived/sbin/keepalived /usr/sbin/
mkdir /etc/keepalived
cp/usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
#service keepalived start|stop
开启负载服务器路由机制,分别在master和backup上操作:
vi/etc/sysctl.conf
net.ipv4.ip_forward = 1
执行sysctl -p，立即生效。
Keealived的配置:
分别在主从负载均衡服务器上配置/etc/keepalived/keepalived.conf，内容分别如下:
Lvs Keepalived –master配置.
global_defs {
notification_email {
info@139.com#email通知
}
notification_email_from info@139.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_instanceVI_1 {
state MASTER #lvs的状态，MASTER或BACKUP两种，必须大写
interface eth0 #设置对外服务的接口
virtual_router_id 51 #设置虚拟路由表示
priority 100 #设置优先级，数值越大，优先级越高
advert_int 1 #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,如果有多个VIP，继续换行填写.
172.16.10.188
}
}
virtual_server 172.16.10.188 80 {
delay_loop 6 #健康检查时间间隔
lb_algo rr #负载均衡调度算法,八种.
lb_kind DR #负载均衡转发规则,DR(改写请求MAC，传到真实服务
器，并直接返回给客户，需同一网段)NAT(地址转换，地
址重写再返回给客户)
TUN(类似NAT,后端操作系统需支持"IP Tunneling"协议)
persistence_timeout 50 #设置会话保持时间，对bbs等很有用
protocol TCP #协议
real_server 172.16.10.162 80 {
weight 1 #设置权重
TCP_CHECK {
connect_port 80
connect_timeout 30 #(30秒无响应超时)
}
}
real_server 172.16.10.163 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 30
}
}
}
Lvs keepalived –backup配置。
global_defs {
notification_email {
info@139.com#email通知
}
notification_email_from info@139.com
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS2 #设置lvs的id，在一个网络内应该是唯一的
}
vrrp_instanceVI_1 {
state BACKUP #lvs的状态，MASTER或BACKUP两种，必须大写
interface eth0 #设置对外服务的接口
virtual_router_id 51 #设置虚拟路由表示
priority 99 #设置优先级，数值越大，优先级越高
advert_int 1 #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,如果有多个VIP，继续换行填写.
172.16.10.188
}
}
virtual_server 172.16.10.188 80 {
delay_loop 6 #健康检查时间间隔
lb_algo rr #负载均衡调度算法,rr,wrr,lc,wlc,lblc,lblcr,dh,sh
lb_kind DR #负载均衡转发规则,DR(改写请求MAC，传到真实服务器，
并直接返回给客户，需同一网段)NAT(地址转换，地址重写
再返回给客户)TUN(同上)
persistence_timeout 50 #设置会话保持时间，对bbs等很有用
protocol TCP #协议
real_server 172.16.10.162 80 {
weight 1 #设置权重
TCP_CHECK {
connect_port 80
connect_timeout 30 #(30秒无响应超时)
}
}
real_server 172.16.10.163 80 {
weight 1
TCP_CHECK {
connect_port 80
connect_timeout 30
}
}
}
Realserver的配置，两台web服务器增加如下脚本:
chmod +x /etc/rc.d/init.d/realserver.sh
/etc/rc.d/init.d/realserver.sh start
echo /etc/rc.d/init.d/realserver.sh start >> /etc/rc.local
cat /etc/rc.d/init.d/realserver.sh
#!/bin/bash
# description: Config realserver lo andapply noarp
SNS_VIP=172.16.10.188
. /etc/rc.d/init.d/functions
case "$1" in
start)
ifconfiglo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
/sbin/routeadd -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)
ifconfiglo:0 down
routedel $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}"
exit1
esac
exit 0
lo:0 Link encap:Local Loopback
inet addr:172.16.10.188 Mask:255.255.255.255
UPLOOPBACK RUNNING MTU:16436 Metric:1
查看lvs服务是否正常:
1、watch ipvsadm –ln
2、tail–f /var/log/message 监听日志，测试LVS负载均衡及高可用性是否有效。
3、停Master服务器的keepalived服务，查看BAKCUP服务器是否能正常接管服务。
参考:
http://network.51cto.com/art/201006/206831.htm
一个很方便管理LVS+Keepalived负载均衡平台的B/S软件。
https://code.google.com/p/tianyalvs
