LVS+Keepalived搭建负载均衡服务器

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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 {
     383523842@qq.com#email通知接收的邮箱
#     failover@firewall.loc
#     sysadmin@firewall.loc
   }
   notification_email_from luoyeguigen9520@163.com#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