LVS+Keepalived搭建负载均衡服务器
IP信息列表：
LVS-DR-Master 192.168.0.14
LVS-DR-BACKUP 192.168.0.16
Realserver-1 192.168.0.11
Realserver-2 192.168.0.30
VIP192.168.0.110
GATEWAY=192.168.0.1
服务器IP配置信息：
192.168.0.14 cat /etc/sysconfig/network-scripts/ifcfg-eth0
192.168.0.16 cat /etc/sysconfig/network-scripts/ifcfg-eth0
192.168.0.11 cat /etc/sysconfig/network-scripts/ifcfg-eth0
192.168.0.30 cat /etc/sysconfig/network-scripts/ifcfg-eth0
一、安装lvs
分别在LVS-DR-Master和LVS-DR-BACKUP上安装lvs
http://www.linuxvirtualserver.org/官网下载lvs ipvsadm-1.26.tar.gz
1.将压缩包上传到/usr/local/soft/下
2.解压tar包
3.cd ipvsadm-1.26
4.lvs的安装依赖gcc、yum install -y libnl* popt*
5.make && make install
二、安装keepalived
分别在LVS-DR-Master和LVS-DR-BACKUP上安装keepalived
http://www.keepalived.org/官网下载keepalived 1.2.17
1.将压缩包上传到/usr/local/soft/下
2.解压tar包
3.cd keepalived-1.2.17
4.keepalived的安装依赖yum install -y openssl openssl-devel
5../configure
6.make && make install
7.cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
8.cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
9.mkdir /etc/keepalived
10.cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
11.cp /usr/local/sbin/keepalived /usr/sbin/
12.keepalived加入系统启动项chkconfig --level 0123456 keepalived on
13.service keepalived start|stop
三、开启路由转发
vi /etc/sysctl.conf
修改下面的值，从0修改为1：
net.ipv4.ip_forward = 1
刷新系统变量，使系统文件变更马上生效
sysctl -p
DR和REALSERVER服务器的配置文件如下：
四、DR配置master和backup
vi /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
notification_email {
[email protected]#email通知接收的邮箱
}
notification_email_from [email protected]#email通知发起的邮箱
smtp_server 127.0.0.1
# smtp_connect_timeout 30
router_id LVS_DEVEL#设置lvs的id，在一个网络内应该是唯一的
}
vrrp_sync_group hot { #设置vrrp组
group {
loadbalance
}
}
vrrp_instance loadbalance {
state MASTER#备份服务器上将MASTER改为BACKUP设置lvs的状态，包括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 51#设置虚拟路由表示
priority 100#备份服务上将100改为99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 {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {#设置lvs vip
192.168.0.110
# 192.168.200.17
# 192.168.200.18
}
}
virtual_server 192.168.0.110 80 {
delay_loop 6#健康检查时间间隔每隔x秒查询realserver状态
lb_algo wlc#负载均衡调度算法
lb_kind DR#负载均衡转发规则
#nat_mask 255.255.255.0
persistence_timeout 60#(同一IP的连接60秒内被分配到同一台realserver)
protocol TCP#(用TCP协议检查realserver状态)
real_server 192.168.0.11 80 {
weight 3#(权重)
TCP_CHECK {
connect_timeout 10 #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
real_server 192.168.0.30 80 {
weight 3#(权重)
TCP_CHECK {
connect_timeout 10 #(10秒无响应超时)
nb_get_retry 3
delay_before_retry 3
connect_port 80
}
}
}
五、RealServer配置文件
vi /usr/local/sbin/realserver.sh
#!/bin/bash
# description: Config realserver lo and apply noarp
SNS_VIP=192.168.0.110
/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
六、RealServer配置文件赋给执行权限
chmod 755 /etc/rc.d/init.d/functions
chmod 755 /usr/local/sbin/realserver.sh
/usr/local/sbin/realserver.sh start
添加自启动 echo “/usr/local/sbin/realserver.sh start” >> /etc/rc.local
启动时如果报错：
/bin/bash^M: bad interpreter: 没有那个文件或目录
vi /usr/local/sbin/realserver.sh
:set ff?
若果出现fileformat=dos那么说明文件格式是windows的
:set fileformat=unix
:wq
七、日志位置 /var/log/message
八、开放端口 vi /etc/sysconfig/iptables
增加一行
-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
保存 重启 service iptables restart