keepalived双主模型高可用+lvs-实例

拓扑图：

环境准备：
Centos6.5x86_64 关闭防火墙和Selinux

node5: eth0:192.168.1.190/24   VIP：192.168.1.121/24
node1：eth1:192.168.1.191/24   VIP：192.168.1.122/24
node2：RIP：eth0: 192.168.19.2/24
node3：RIP：eth0: 192.168.19.3/24   所有节点网关/DNS都为：192.168.1.1

每个服务器的hosts文件

# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.19.190    node5.luo.com    node5
192.168.19.191    node1.luo.com    node1
192.168.19.192    node2.luo.com    node2
192.168.19.193    node3.luo.com    node3

时间同步（每个节点都需要做）

为方便实验使用笔记本作为时间服务器，参考http://blog.csdn.net/irlover/article/details/7314530

ntpdate 192.168.1.105

如我想每隔10分钟和win7同步时间可以使用crontab -e 编辑crontab工作内容如下：

*/10 * * * * /usr/sbin/ntpdate 192.168.1.105 &>/dev/null&&/sbin/hwclock-w

配置后端real server ：node2与node3

node2与node3都执行下面的配置

echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
echo 1 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
echo 2 > /proc/sys/net/ipv4/conf/eth0/arp_ignore
ifconfig lo:0 192.168.1.121 netmask 255.255.255.255 broadcast 192.168.1.121
route add -host 192.168.1.121 dev lo:0
ifconfig lo:1 192.168.1.122 netmask 255.255.255.255 broadcast 192.168.1.122
route add -host 192.168.1.122 dev lo:1

分别为node2与node3安装httpd并写好测试页面

# yum install httpd

node2测试页面

# echo "<h1>node2.luo.com</h1>" > /var/www/html/index.html

# service httpd restart

# curl http://192.168.1.192

node3测试页面

#  echo "<h1>node3.luo.com</h1>" > /var/www/html/index.html

# service httpd restart

# curl http://192.168.1.193

二、配置前端的Director

node5与node1安装配置基本相同

在两个节点上都安装keepalived

# yum install -y keepalived ipvsadm

node5的配置与node1的不同之处在与两个实例中的角色刚好相反，node5为MASTER时，node1为BACKUP，其相应的优先级也有所改变，其他配置相同。

node5配置文件

! 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 localhost
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 61
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.1.121
    }
}
vrrp_instance VI_2 {
    state BACKUP
    interface eth0
    virtual_router_id 71
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.1.122
    }
}
virtual_server 192.168.1.121 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP
    real_server 192.168.1.192 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
    real_server 192.168.1.193 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
}
virtual_server 192.168.1.122 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP
    real_server 192.168.1.192 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
    real_server 192.168.1.193 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
}

node1配置文件

! 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 localhost
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state BACKUP
    interface eth1
    virtual_router_id 61
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.1.121
    }
}
vrrp_instance VI_2 {
    state MASTER
    interface eth1
    virtual_router_id 71
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.1.122
    }
}
virtual_server 192.168.1.121 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP
    real_server 192.168.1.192 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
    real_server 192.168.1.193 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
}
virtual_server 192.168.1.122 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    protocol TCP
    real_server 192.168.1.192 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
    real_server 192.168.1.193 80 {
        weight 1
        HTTP_GET {
            url {
              path /
                status_code 200
            }
            connect_timeout 2
            nb_get_retry 3
            delay_before_retry 1
        }
    }
}

测试

先启动node5节点的keepalived服务，可以看到两个VIP地址都配置在了node5的eth0网卡上。

ipvs规则的启动效果为，可以看到两组规则也都启动在了node5上。

启动node1的keepalived服务，查看相关信息

模拟node5节点服务器故障，此处直接停止node5的keepalived服务，查看node1信息都无误，两个VIP都到node1上面了

至此，实验完毕，如有错误之处，请多多指教。