Centos6 Lvs+Keepalived Dr模式 配置搭建

http://blog.lunhui.ren/archives/395

centos6.8

我有三台服务器ip分别是172.16.3.241,172.16.3.242,172.16.3.243

1个虚拟ip：172.16.3.240

目的，当我访问172.16.3.240 lvs会根据规则路由到241-243
  3台不同的机器

master服务器安装：

安装ipvsadm

yum install ipvsadm

安装keepalived 

yum install keepalived

安装依赖

yum -y install openssl-devel
yum installncurses-devel gcc gcc-c++ make rpm-build

将keepalived配置成系统服务

cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
mkdir /etc/keepalived/
cp /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/

修改修改主keepalived配置文件（从服务器只修改router_id、state和priority）

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
notification_email {
acassen@firewall.loc
failover@firewall.loc
sysadmin@firewall.loc
}
notification_email_from Alexandre.Cassen@firewall.loc
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}

vrrp_instance VI_1 {
state MASTER
interface eth0
virtual_router_id 51
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
172.16.3.240
}
}

virtual_server 172.16.3.240 80 {
delay_loop 6
lb_algo rr
lb_kind DR
nat_mask 255.255.255.0
persistence_timeout 50
protocol TCP

real_server 172.16.3.242 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}

real_server 172.16.3.243 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}

real_server 172.16.3.241 80 {
weight 3
TCP_CHECK {
connect_timeout 3
nb_get_retry 3
delay_before_retry 3
}
}
}

}

配置ipvsadm for Master

把一下内容保存成:lvs_server.sh，并放置在/etc/init.d目录下

#!/bin/bash
#把一下内容保存成:lvs_server.sh
#并放置在/etc/init.d目录下
#如果想启动LVS Server执行:/etc/init.d/lvs_server.sh start
#如果想停止LVS Server执行:/etc/init.d/lvs_server.sh stop
#如果想重启LVS Server执行:/etc/init.d/lvs_server.sh restart

VIP=172.16.3.240 #虚拟IP，更具具体情况而变
#有几个输入几个，与下面的配置对应，同时必须与KeepAlived.config配置对应
RIP1=172.16.3.241 #实际的服务器IP
RIP2=172.16.3.242 #实际的服务器IP
RIP3=172.16.3.243 #实际的服务器IP
. /etc/rc.d/init.d/functions # 如果提示权限不够，那么先在命令行执行: chmod 777 /etc/rc.d/init.d/functions
case "$1" in

start)
echo "启动LVS服务器"
#设置虚拟IP和同步参数
/sbin/ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.0 up
echo "1" >/proc/sys/net/ipv4/ip_forward
#清空 IPVS的内存数据
/sbin/ipvsadm -C

#开启WEB 80 端口服务，并指向RIP1和RIP2的服务器
/sbin/ipvsadm -A -t $VIP:80 -s rr
/sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -g
/sbin/ipvsadm -a -t $VIP:80 -r $RIP3:80 -g
#运行LVS
/sbin/ipvsadm -ln
;;
stop)
echo "关闭LVS服务器"
echo "0" >/proc/sys/net/ipv4/ip_forward
/sbin/ipvsadm -C
/sbin/ifconfig eth0:0 down
;;

restart)
echo "关闭LVS服务器"
echo "0" >/proc/sys/net/ipv4/ip_forward
/sbin/ipvsadm -C
/sbin/ifconfig eth0:0 down

echo "启动LVS服务器"
#设置虚拟IP和同步参数
/sbin/ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.0 up
echo "1" >/proc/sys/net/ipv4/ip_forward
#清空 IPVS的内存数据
/sbin/ipvsadm -C

#设置LVS
#开启WEB 80 端口服务，并指向RIP1和RIP2的服务器
/sbin/ipvsadm -A -t $VIP:80 -s rr
/sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g
/sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -g
/sbin/ipvsadm -a -t $VIP:80 -r $RIP3:80 -g
#运行LVS
/sbin/ipvsadm -ln
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac

/etc/init.d/lvs_server.sh使用方法

[root@RServer2 ~]# chmod 777 /etc/init.d/lvs_server.sh

[root@RServer2 ~]# chmod 777 /etc/rc.d/init.d/functions

[root@RServer2 ~]# /etc/init.d/lvs_server.sh start|stop|restart

从服务器安装配置Master的安装基本一致，只是一些参数略有变化。

变化的参数为止如下：

1、keepalived.conf文件中

 原：state MASTER #标示状态为MASTER 备份机为BACKUP

state BACKUP  #标示状态改为BACKUP

 

原：priority 100   #MASTER权重要高于BACKUP 比如BACKUP为99

priority 99   #MASTER权重要高于BACKUP，MASTER为100，那么BACKUP略小于，比如99

RealServer配置步骤

把一下内容保存成:lvs_real_server.sh，并放置在/etc/init.d目录下

#!/bin/bash
#把一下内容保存成:lvs_real_server.sh
#并放置在root目录下
#如果想启动real Server执行:/root/lvs_real_server.sh start
#如果想停止real Server执行:/root/lvs_real_server.sh stop

CLUSTER_VIP=172.16.3.240 #虚拟IP，更具具体情况而变
. /etc/rc.d/init.d/functions # 如果提示权限不够，那么先在命令行执行: chmod 777 /etc/rc.d/init.d/functions
case "$1" in
start)
/sbin/ifconfig lo:0 $CLUSTER_VIP netmask 255.255.255.0 broadcast $CLUSTER_VIP
/sbin/route add -host $CLUSTER_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 "真实服务器启动....."
;;
stop)
/sbin/ifconfig lo:0 down
/sbin/route del $CLUSTER_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 "真实服务器停止....."
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac

/root/lvs_real_server.sh使用方法

[root@RServer2 ~]# chmod 777 /root/lvs_real_server.sh

[root@RServer2 ~]# chmod 777 /etc/rc.d/init.d/functions

[root@RServer2 ~]# /root/lvs_real_server.sh start|stop|restart

为了方便测试 每台机器安装httpd服务

yum install httpd

每台机器都创建index.html

echo “172.16.3.241” > /var/www/html/index.html

echo “172.16.3.242” > /var/www/html/index.html

echo “172.16.3.243” > /var/www/html/index.html

[root@localhost ~]# service iptables stop  #关闭防火墙

[root@localhost ~]# setenforce 0  #临时关闭selinux

测试
http://1172.16.3.240 #访问一直刷新会轮训显示1172.16.3.241-243

常用命令：

[root@localhost ~]# ipvsadm -ln #显示集群中服务器ip信息

[root@localhost ~]# ip addr #显示VTP绑定在哪个服务器上