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FastDFS蛋疼的集群和负载均衡(十八)之LVS+Keepal

FastDFS蛋疼的集群和负载均衡(十八)之LVS+Keepal

作者: cmazxiaoma | 来源:发表于2018-01-06 14:32 被阅读0次
    diary_report.jpg

    Interesting things

    我们之前的Keepalived+LVS单主模式，是只有一台lvs工作，这会造成资源浪费，可以采用双主结构，让两台lvs都进行工作，采用dns轮询方式，当用户访问域名通过dns轮询每天lvs，双主结构需要2个vip，这2个vip需要绑定域名。

    同样，在每台lvs上安装keepalived软件，当keepalived检测到其中一个lvs宕机则将宕机的vip漂移到活动lvs上，当lvs恢复则vip又重新漂移回来。

    附上我画的拓扑图
    初始状态

    image.png

    其中一个主机宕机

    image.png

    主机恢复


    image.png

    所需环境
    vip1 192.168.12.101
    vip2 192.168.12.102
    lvs_master1 192.168.12.12
    lvs_master2 192.168.12.13
    nginx1 192.168.12.2
    nginx2 192.168.12.3
    tomcat1 192.168.12.6
    tomcat2 192.168.12.7

    What did you do today

    双主模式相比主从环境，区别在于：
    1.DNS轮询。
    2.LVS负载均衡层需要2个vip。比如192.168.12.12和192.168.12.13
    3.后端的realServer上要绑定这2个vip到lo本地回环设备上
    4.keepalived.conf的配置相比于上面的主从模式有所不同。

    • 在192.168.12.2和192.168.12.3机器要绑定2个vip到本地回环口lo上(分别绑定lo:0和lo:1),所以需要在/etc/init.d/下编写double_master_lvsdr0和double_master_lvsdr1脚本，具体如下：
    #!/bin/sh
VIP=192.168.12.101
. /etc/rc.d/init.d/functions
    
case "$1" in
  
start)
    /sbin/ifconfig lo down
    /sbin/ifconfig lo up
    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
    /sbin/sysctl -p >/dev/null 2>&1
    /sbin/ifconfig lo:0 $VIP netmask 255.255.255.255 up  
    /sbin/route add -host $VIP dev lo:0
    echo "LVS-DR real server starts successfully.\n"
    ;;
stop)
    /sbin/ifconfig lo:0 down
    /sbin/route del $VIP >/dev/null 2>&1
    echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
    echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "LVS-DR real server stopped.\n"
    ;;
status)
    isLoOn=`/sbin/ifconfig lo:0 | grep "$VIP"`
    isRoOn=`/bin/netstat -rn | grep "$VIP"`
    if [ "$isLoON" == "" -a "$isRoOn" == "" ]; then
        echo "LVS-DR real server has run yet."
    else
        echo "LVS-DR real server is running."
    fi
    exit 3
    ;;
*)
    echo "Usage: $0 {start|stop|status}"
    exit 1
esac
exit 0

    #!/bin/sh
VIP=192.168.12.102
. /etc/rc.d/init.d/functions
    
case "$1" in
  
start)
    /sbin/ifconfig lo down
    /sbin/ifconfig lo up
    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
    /sbin/sysctl -p >/dev/null 2>&1
    /sbin/ifconfig lo:1 $VIP netmask 255.255.255.255 up   
    /sbin/route add -host $VIP dev lo:1
    echo "LVS-DR real server starts successfully.\n"
    ;;
stop)
    /sbin/ifconfig lo:1 down
    /sbin/route del $VIP >/dev/null 2>&1
    echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
    echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
    echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
echo "LVS-DR real server stopped.\n"
    ;;
status)
    isLoOn=`/sbin/ifconfig lo:1 | grep "$VIP"`
    isRoOn=`/bin/netstat -rn | grep "$VIP"`
    if [ "$isLoON" == "" -a "$isRoOn" == "" ]; then
        echo "LVS-DR real server has run yet."
    else
        echo "LVS-DR real server is running."
    fi
    exit 3
    ;;
*)
    echo "Usage: $0 {start|stop|status}"
    exit 1
esac
exit 0
    • 将double_master_lvsdr0和double_master_lvsdr1设置开机启动

    [root@localhost init.d]# chmod +x double_master_lvsdr0
    [root@localhost init.d]# chmod +x double_master_lvsdr1
    [root@localhost init.d]# echo "/etc/init.d/double_master_lvsdr0" >> /etc/rc.d/rc.local
    [root@localhost init.d]# echo "/etc/init.d/double_master_lvsdr1" >> /etc/rc.d/rc.local


    image.png

    • 启动double_master_lvsdr0和double_master_lvsdr1脚本


      image.png

    • 查看192.168.12.2和192.168.12.3，发现vip已经成功绑定到本地回环口lo上了。


      ![image.png](https://img.haomeiwen.com/i4636177/b99a4b5e1af33989.png?imageMogr2/auto-orient/strip%7CimageView2/2/w/1240)

    • 在lvs_master1和lvs_master2打开ip_forward路由转发功能

    [root@localhost ~]# echo "1" > /proc/sys/net/ipv4/ip_forward

    • lvs_master1上的keepalived.conf配置如下：
    ! Configuration File for keepalived

global_defs {
   router_id LVS_MASTER
}

vrrp_script check_lvs {
   script "/etc/keepalived/lvs_check.sh"
   interval 2
   weight  -20
}

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

    track_script {
        check_lvs
    }

    virtual_ipaddress {
        192.168.12.101
    }
}

vrrp_instance VI_2 {
    state BACKUP
    interface eth0
    virtual_router_id 52
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }

    track_script {
        check_lvs
    }

    virtual_ipaddress {
        192.168.12.102
    }
}

virtual_server 192.168.12.101 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    #nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP


    real_server 192.168.12.2 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.12.3 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}


virtual_server 192.168.12.102 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    #nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP


    real_server 192.168.12.2 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.12.3 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}
    • lvs_master2中的keepalived配置如下:
    ! Configuration File for keepalived
    
global_defs {
   router_id LVS_BACKUP
}

vrrp_script check_lvs {
   script "/etc/keepalived/lvs_check.sh"
   interval 2
   weight  -20
}
    
vrrp_instance VI_1 {
    state BACKUP        
    interface eth0           
    virtual_router_id 51     
    priority 90             
    advert_int 1             
    authentication {
        auth_type PASS       
        auth_pass 1111       
    }

    track_script {
        check_lvs
    }

    virtual_ipaddress {
        192.168.12.101       
    }
}
    
vrrp_instance VI_2 {
    state MASTER         
    interface eth0         
    virtual_router_id 52 
    priority 100          
    advert_int 1          
    authentication {
        auth_type PASS     
        auth_pass 1111     
    }

    track_script {
        check_lvs
    }

    virtual_ipaddress {
        192.168.12.102   
    }
}
  
virtual_server 192.168.12.101 80 {
    delay_loop 6             
    lb_algo wrr              
    lb_kind DR               
    #nat_mask 255.255.255.0
    persistence_timeout 50   
    protocol TCP            
    
  
    real_server 192.168.12.2 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.12.3 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}
  
  
virtual_server 192.168.12.102 80 {
    delay_loop 6             
    lb_algo wrr              
    lb_kind DR               
    #nat_mask 255.255.255.0
    persistence_timeout 50   
    protocol TCP            
    
  
    real_server 192.168.12.2 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
    real_server 192.168.12.3 80 {
        weight 3
        TCP_CHECK {
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
            connect_port 80
        }
    }
}
    • 编写lvs_check.sh脚本。
    a=`ipvsadm -ln`
str="Route"
bb=`echo $aa|grep $str|wc -l`
if [ $bb = 0 ];then     
    sleep 3
    aa=`ipvsadm -ln`
    bb=`echo $aa|grep $str|wc -l`
    if [ $bb = 0 ];then
        killall keepalived
    fi
fi

    • 启动192.168.12.2和192.16812.3的nginx、double_master_lvsdr0、double_master_lvsdr1服务。启动192.168.12.6和192.168.12.7的tomcat。

    • 我们查看lvs_master1的eth0节点信息，发现绑定了vip1(192.168.12.101)


      image.png

    • 查看lvs_master2的eth0节点信息，发现绑定了vip2(192.168.12.102)


      image.png

    • 查看lvs_master1的lvs以及realserver的信息。


      image.png

    • 查看lvs_master2的lvs以及realserver的信息


      image.png

    • 修改hosts文件(C:\Windows\System32\drivers\etc\hosts)，指定cmaxiaoma.mayday.com对应的2个vip。(在hosts里这样设置，达不到负载均衡，只会优先访问192.168.12.101)


      image.png

    • 访问cmazxiaoma.mayday.com


      image.png

    • 我们停止掉lvs_master1.


      image.png

    • 当我们又恢复lvs_master1.vip1又回到了lvs_master1手里，而lvs_master2又失去了vip1。


      image.png
      image.png

    • 在lvs_master2的eth0以及lvs、RealServer信息。


      image.png
      image.png

    Summary

    今天加班就到这里了，回去要照顾女朋友了！

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