RHEL6平台Keepalived+LVS+iSCSI+GFS搭建高可用负载均衡

主要实现的是一个高可用负载均衡web服务器集群，适合lamp架构。
前端使用两台服务器做lvs+keepalived负载调度器，中间可以用N台做apache+php应用服务器，后面使用两台做mysql高可用双机，最后面用了一台虚拟机做文件服务器。
一共开了7个虚拟机。
系统环境：RHEL6.0 kvm虚拟机
lvs调度服务器：192.168.0.1   192.168.0.2
apache服务器:192.168.0.3    192.168.0.4
mysql服务器:192.168.0.7   192.168.0.8
文件服务器:192.168.0.10
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一、lvs调度服务器
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Keepalived+lvs
服务器环境:
系统均是:RHEL6.0 内核:2.6.32-71.el6.i686)
Virtual IP:192.168.0.50
Load Balancer:192.168.0.1
Backup:192.168.0.2
Real Server 1:192.168.0.3
Real Server 2:192.168.0.4

主备机上的软件包安装与配置
yum install ipvsadm kernel­-devel -y
wget
tar zxf keepalived-1.1.20.tar.gz
cd keepalived­1.1.20
./configure ­­prefix=/usr/local/keepalived ­­with­kernel­dir=/usr/src/kernels/2.6.32-71.el6.i686/
86/

Keepalived configuration
­­­­­­­­­­­­­­­­­­­­­­Keepalived version  : 1.1.17
Compiler: gcc
Compiler flags: ­g ­O2
Extra Lib: ­lpopt ­lssl ­lcrypto
Use IPVS Framework: Yes;注意编译时一定要支持 lvs
IPVS sync daemon support: Yes
Use VRRP Framework: Yes
Use LinkWatch: No
Use Debug flags: No
make
make install

mkdir /etc/keepalived
ln ­-s /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
ln ­-s /usr/local/keepalived/etc/keepalived/keepalived.conf /etc/keepalived/
ln ­-s /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
ln -s /usr/local/keepalived/bin/* /bin/
ln -s /usr/local/keepalived/sbin/* /sbin/

vi /etc/rc.local
modprobe ip_vs

vi /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {
   notification_email {
        root@example.com#接收警报的 email 地址,可以添加多个
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1#使用本机转发 email
   smtp_connect_timeout 30
   router_id LVS_DEVEL#load balancer 的标识 ID,用于 email 警报
}
vrrp_instance VI_1 {
    state MASTER#备机改为 BACKUP,此状态是由 priority 的值来决定的,当前
priority 的值小于备机的值,那么将会失去 MASTER 状态
    interface eth0#HA 监测网络接口
    virtual_router_id 50#主、备机的 virtual_router_id 必须相同
    priority 150#主机的优先级,备份机改为 50
    advert_int 1#主备之间的通告间隔秒数
    authentication {
        auth_type PASS#主备切换时的验证
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.0.111#HA 虚拟 ip,可加多个
    }
}
    
    
    
 
virtual_server 192.168.0.111 80 {
    delay_loop 6#每隔 6 秒查询 realserver状态
    lb_algo rr#lvs 调度算法,这里使用轮叫
    lb_kind DR#lvs 负载均衡机制,这里使用直连路由
#    persistence_timeout 50  #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 192.168.0.1 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3  #故障重试秒数
            nb_get_retry 3  #重试延迟
            delay_before_retry 3
        }
    }
    real_server 192.168.0.2 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }
}