生产环境：LVS+Keepalived部署
因工作需要搭建LVS(VIP: 10.0.32.224)
10.0.32.59LVS-Master
10.0.32.65LVS-Backup
10.0.32.84(LVS-tomcat3)
10.0.32.101(LVS-tomcat4)
1、安装LVS軟件
1.1.查看是否有IPVS模块
# modprobe -l | grepipvs
kernel/net/netfilter/ipvs/ip_vs.ko
kernel/net/netfilter/ipvs/ip_vs_rr.ko
kernel/net/netfilter/ipvs/ip_vs_wrr.ko
kernel/net/netfilter/ipvs/ip_vs_lc.ko
kernel/net/netfilter/ipvs/ip_vs_wlc.ko
kernel/net/netfilter/ipvs/ip_vs_lblc.ko
kernel/net/netfilter/ipvs/ip_vs_lblcr.ko
kernel/net/netfilter/ipvs/ip_vs_dh.ko
kernel/net/netfilter/ipvs/ip_vs_sh.ko
kernel/net/netfilter/ipvs/ip_vs_sed.ko
kernel/net/netfilter/ipvs/ip_vs_nq.ko
kernel/net/netfilter/ipvs/ip_vs_ftp.ko
kernel/net/netfilter/ipvs/ip_vs_pe_sip.ko
1.2.安装IPVS管理工具
# yum-y install ipvsadm
2、安装keepalived（分别在LVS-Master和LVS-Backup中）
2.1.安装keepalived并配置。
# yum -yinstall keepalived（yum安装keepalived）
# vi /etc/keepalived/keepalived.conf
!Configuration File for keepalived
global_defs{
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_fromAlexandre.Cassen@firewall.loc
smtp_server 192.168.200.1#设置SMTP Server地址
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_sync_groupLVS_GV1 {
group {
LVS_qingsuan #写集群的名字‘LVS_“名字”’，如：清算平台服务器
}
}
vrrp_instanceLVS_qingsuan{
state MASTER #指定Keepalived的角色，MASTER为主，BACKUP为备
interface eth0 #绑定真实的物理网卡
virtual_router_id 51 #虚拟路由编号，主备要一致
priority 100 #定义优先级，数字越大，优先级越高，主DR必须大于备用DR
advert_int 1 #检查间隔，默认为1s
authentication {
auth_type PASS
auth_pass qingsuan
}
virtual_ipaddress {
10.0.32.224 #定义虚拟IP(VIP)为可多设，每行一个
}
}
virtual_server10.0.32.224443 { #定义对外提供服务的LVS的VIP以及port
delay_loop 6 #设置健康检查时间，单位是秒
lb_algo wlc #设置负载调度的算法为wlc
lb_kind DR #设置LVS实现负载的机制，有NAT、TUN、DR三个模式,设DR模式
persistence_timeout 50 #会话保持时间，单位为秒
protocol TCP #指定转发协议类型，有TCP和UDP两种
sorry_server 127.0.0.1 80
real_server 10.0.32.84 443 { #指定real server1的IP地址
weight 1 #配置节点权值，数字越大
TCP_CHECK {
connect_timeout 3 #表示3秒无响应，则超时
tcp_port 443
}
}
real_server10.0.32.101 443 { #指定real server2的IP地址
weight 1 #配置节点权值，数字越大
TCP_CHECK {
connect_timeout 3 #表示3秒无响应，则超时
}
}
}
2.2.启动keepalived、设置keepalived服务自启动，检查是否生效。
# /etc/init.d/keepalived start
# chkconfigkeepalived on
3、在LVS-Backup上安装LVS、keepalived并配置
3.1.安装LVS、keepalived
# yum-y install ipvsadm
# yum-y install keepalived
3.2.配置LVS-Backup的keepalived
先从LVS－Master把修改过的keepalived配置文件复制过来。
#scpkeepalived.conf root@10.0.32.65:/etc/keepalived/
# vi /etc/keepalived/keepalived.conf
只修改state为BACKUP和priority为90，MASTER为主机服务器，BACKUP为备用服务器。
stateBACKUP
priority90
3.3.启动LVS-Backup的keeplived服务，并检查是否生效。
# /etc/init.d/keepalived start
# chkconfigkeepalived on
5、配置WEB服务器，即real server节点1和2
由于采用的是DR方式调度，Real_Server会以LVS的VIP来直接回复Client，所以需要在Real_Server的lo上开启LVS的VIP来与Client建立通信
配置web
# vi /etc/init.d/lvs-server＃编辑脚本放到/etc/init.d/下
#!/bin/bash
#chkconfig: 35 85 15
VIP=10.0.32.223
chmod755 /etc/rc.d/init.d/functions
./etc/rc.d/init.d/functions
case"$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $VIP broadcast $VIPnetmask 255.255.255.255 up
/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
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Directorserver"
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"Usage: $0 {start|stop}"
exit 1
esac
# chmod 755 /etc/init.d/lvs-server
# /etc/init.d/lvs-server start
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