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Linux-利用keepalived实现lvs的高可用性

发布时间:2019-10-13 18:49编辑:热门贴子浏览(172)

    图片 1

    lvs+keepalived是什么?

    单主模型IPVS示例

    keepalived工作原理

    配置keepalive

    高可用的ipvs集群示例:修改keepalived配置文件

    keepalived是集群管理中保证集群高可用的一个服务软件,其功能类似于heartbeat,用来防止单点故障。 keepalived是以VRRP协议为实现基础的,VRRP全称Virtual Router Redundancy Protocol,即虚拟路由冗余协议。 虚拟路由冗余协议,可以认为是实现路由器高可用的协议,即将N台提供相同功能的路由器组成一个路由器组,这个组里面有一个master和多个backup,master上面有一个对外提供服务的vip(该路由器所在局域网内其他机器的默认路由为该vip),master会发组播,当backup收不到vrrp包时就认为master宕掉了,这时就需要根据VRRP的优先级来选举一个backup当master。这样的话就可以保证路由器的高可用了。

    修改主机:192.168.234.27的keepalived配置文件

      1 [root@234c27 ~]# vim /etc/keepalived/keepalived.conf
      2 ! Configuration File for keepalived
      3 
      4 global_defs {
      5 notification_email {
      6 root@localhost  //接受邮件地址
      7 }
      8 notification_email_from keepalived@localhost  //发送邮件地址
      9 smtp_server 127.0.0.1  //发送邮件服务器IP
     10 smtp_connect_timeout 30  //邮件连接超时时长
     11 router_id kptwo  //路由id
     12 vrrp _mcast_group4 234.10.10.10  //指定vrrp协议的多播地址
     13 }
     14 
     15 vrrp_instance VI_1 {  //vrrp协议的
     16 state MASTER  //lvs的MASTER服务器
     17 interface ens37  //
     18 virtual_router_id 50  //虚拟路由
     19 priority 100  //权重为100.越大越先
     20 advert_int 1  //发送组博包的间隔
     21 authentication {  //验证
     22 auth_type PASS  //方式为pass( 明文)
     23 auth_pass 1111  //密码
     24 }
     25 virtual_ipaddress { //keepalived虚拟ip
     26 10.0.0.100/24
     27 }
     28 }
     29 virtual_server 10.0.0.100 80 {
     30     delay_loop 6  //检查后端服务器的时间间隔
     31     lb_algo wrr  //定义调度方法
     32     lb_kind DR  //集群的类型
     33     #persistence_timeout 50  //持久连接时长
     34     protocol TCP  //服务协议,仅支持TCP
     35     real_server 192.168.234.47 80 {  //后端real_server服务器地址
     36         weight 1 //权重
     37         HTTP_GET {  //应用层检测
     38             url {
     39               path /  //定义要监控的URL
     40               status_code 200  //判断上述检测机制为健康状态的响应码
     41             }
     42             connect_timeout 3  //连接请求的超时时长
     43             nb_get_retry 3  //重试次数
     44             delay_before_retry 3  //重试之前的延迟时长
     45         }
     46     }
     47     real_server 192.168.234.57 80 {
     48         weight 2
     49         HTTP_GET {
     50             url {
     51                 path /
     52                 status_code 200
     53             }
     54             connect_timeout 3
     55             nb_get_retry 3
     56             delay_before_retry 3
     57         }
     58     }
     59 }
    

     LVS简介

    修改主机:192.168.234.37的keepalived配置文件

    [root@234c37 ~]# vim /etc/keepalived/keepalived.conf
    
    ! Configuration File for keepalived
    
    global_defs {
       notification_email {
         root@localhost
       }
       notification_email_from keepalived@localhost
       smtp_server 127.0.0.1
       smtp_connect_timeout 30
       router_id kptwo
       vrrp _mcast_group4 234.10.10.10
    }
    
    vrrp_instance VI_1 {
        state BACKUP
        interface ens37
        virtual_router_id 50
        priority 80
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
           10.0.0.100/24
        }
    }
    virtual_server 10.0.0.100 80 {
        delay_loop 6
        lb_algo wrr
        lb_kind DR
        #persistence_timeout 50
        protocol TCP
        sorry_server 127.0.0.1:80
        real_server 192.168.234.47 80 {
            weight 1
            HTTP_GET {
                url {
                  path /
                  status_code 200
                }
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
            }
        }
        real_server 192.168.234.57 80 {
            weight 2
            HTTP_GET {
                url {
                  path /
                    status_code 200
                }
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
            }
        }
    }
    

    LVS是Linux Virtual Server的简写,意即Linux虚拟服务器,是一个虚拟的服务器集群系统。本项目在1998年5月由章文嵩博士成立,是中国国内最早出现的自由软件项目之一。目前有三种IP负载均衡技术(VS/NAT、VS/TUN和VS/DR),十种调度算法。

    查看keepalived

    [root@234c37 ~]# systemctl status keepalived
    ● keepalived.service - LVS and VRRP High Availability Monitor
       Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
       Active: inactive (dead)
    …………
    [root@234c37 ~]# ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
      -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
    //暂无ipvsadm
    

    本文重点给大家介绍Linux利用keepalived实现lvs的高可用性的操作方法,感兴趣的朋友参考下吧。

    启动服务

    [root@234c27 keepalived]# systemctl start keepalived.service
    [root@234c27 keepalived]# systemctl status keepalived.service
    ● keepalived.service - LVS and VRRP High Availability Monitor
       Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
       Active: active (running) since Fri 2018-08-31 20:30:02 CST; 12s ago
      Process: 9657 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
     Main PID: 9658 (keepalived)
    ………………
    [root@234c27 keepalived]# ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
      -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
    TCP  10.0.0.100:80 wrr
      -> 192.168.234.47:80            Route   1      0          0
      -> 192.168.234.57:80            Route   2      0          0
    //启动服务lvs vs已配置好
    

    图片 2

    后端real_server准备

    单主模型IPVS示例

    增加ip在网卡上 修改限制arp通告及应答级别 rs1 rs2都做,网关并指向路由

    ip a a 10.0.0.100/32 dev ens37
    
    echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
    
    route add default gw 192.168.234.17
    

    安装httpd服务 写好网页文件

    配置keepalive

    启动服务

    图片 3

    高可用的ipvs集群示例:修改keepalived配置文件

    多主模型IPVS示例

    图片 4

    修改主机:192.168.234.27的keepalived配置文件

    配置keepalive

    高可用的ipvs集群示例:修改keepalived配置文件

    [root@234c27 ~]# vim /etc/keepalived/keepalived.conf
    ! Configuration File for keepalived
    global_defs {
    notification_email {
    root@localhost //接受邮件地址
    }
    notification_email_from keepalived@localhost //发送邮件地址
    smtp_server 127.0.0.1 //发送邮件服务器IP
    smtp_connect_timeout 30 //邮件连接超时时长
    router_id kptwo //路由id
    vrrp _mcast_group4 234.10.10.10 //指定vrrp协议的多播地址
    }
    vrrp_instance VI_1 { //vrrp协议的
    state MASTER //lvs的MASTER服务器
    interface ens37 //
    virtual_router_id 50 //虚拟路由
    priority 100 //权重为100.越大越先
    advert_int 1 //发送组博包的间隔
    authentication { //验证
    auth_type PASS //方式为pass( 明文)
    auth_pass 1111 //密码
    }
    virtual_ipaddress { //keepalived虚拟ip
    10.0.0.100/24
    }
    }
    virtual_server 10.0.0.100 80 {
     delay_loop 6 //检查后端服务器的时间间隔
     lb_algo wrr //定义调度方法
     lb_kind DR //集群的类型
     #persistence_timeout 50 //持久连接时长
     protocol TCP //服务协议,仅支持TCP
     real_server 192.168.234.47 80 { //后端real_server服务器地址
      weight 1 //权重
      HTTP_GET { //应用层检测
       url {
        path / //定义要监控的URL
        status_code 200 //判断上述检测机制为健康状态的响应码
       }
       connect_timeout 3 //连接请求的超时时长
       nb_get_retry 3 //重试次数
       delay_before_retry 3 //重试之前的延迟时长
      }
     }
     real_server 192.168.234.57 80 {
      weight 2
      HTTP_GET {
       url {
        path /
        status_code 200
       }
       connect_timeout 3
       nb_get_retry 3
       delay_before_retry 3
      }
     }
    }
    

    修改主机:192.168.234.27的keepalived配置文件

    [root@234c27 keepalived]# vim /etc/keepalived/keepalived.conf
    global_defs {
       notification_email {
         root@localhost
       }
       notification_email_from keepalived@localhost
       smtp_server 127.0.0.1
       smtp_connect_timeout 30
       router_id kpone
       vrrp _mcast_group4 234.10.10.10
    }
    
    vrrp_instance VI_1 {
        state MASTER
        interface ens37
        virtual_router_id 50
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
           10.0.0.100/24
        }
    }
    vrrp_instance VI_2 {
        state BACKUP
        interface ens37
        virtual_router_id 51
        priority 80
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 2222
        }
        virtual_ipaddress {
            10.0.0.200/24
        }
    }
    virtual_server 10.0.0.100 80 {
        delay_loop 6
        lb_algo wrr
        lb_kind DR
        #persistence_timeout 50
        protocol TCP
        #sorry_server 127.0.0.1:80
        real_server 192.168.234.47 80 {
            weight 1
            HTTP_GET {
                url {
                  path /
                  status_code 200
                }
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
            }
        }
    }
    virtual_server 10.0.0.200 80 {
        delay_loop 6
        lb_algo wrr
        lb_kind DR
        #persistence_timeout 50
        protocol TCP
        #sorry_server 127.0.0.1:80
        real_server 192.168.234.57 80 {
            weight 1
            HTTP_GET {
                url {
                  path /
                  status_code 200
                }
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
            }
        }
    }
    

    修改主机:192.168.234.37的keepalived配置文件

    修改主机:192.168.234.37的keepalived配置文件

    [root@234c37 ~]# vim /etc/keepalived/keepalived.conf
    ! Configuration File for keepalived
    
    global_defs {
       notification_email {
         root@localhost
       }
       notification_email_from keepalived@localhost
       smtp_server 127.0.0.1
       smtp_connect_timeout 30
       router_id kptwo
       vrrp _mcast_group4 234.10.10.10
    }
    
    vrrp_instance VI_1 {
        state BACKUP
        interface ens37
        virtual_router_id 50
        priority 80
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 1111
        }
        virtual_ipaddress {
           10.0.0.100/24
        }
    }
    vrrp_instance VI_2 {
        state MASTER
        interface ens37
        virtual_router_id 51
        priority 100
        advert_int 1
        authentication {
            auth_type PASS
            auth_pass 2222
        }
        virtual_ipaddress {
            10.0.0.200/24
        }
    }
    virtual_server 10.0.0.100 80 {
        delay_loop 6
        lb_algo wrr
        lb_kind DR
        #persistence_timeout 50
        protocol TCP
        #sorry_server 127.0.0.1:80
        real_server 192.168.234.47 80 {
            weight 1
            HTTP_GET {
                url {
                  path /
                  status_code 200
                }
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
            }
        }
    }
    virtual_server 10.0.0.200 80 {
        delay_loop 6
        lb_algo wrr
        lb_kind DR
        #persistence_timeout 50
        protocol TCP
        #sorry_server 127.0.0.1:80
        real_server 192.168.234.57 80 {
            weight 1
            HTTP_GET {
                url {
                  path /
                  status_code 200
                }
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 3
            }
        }
    }
    

    让10.0.0.100的ip优先分配至192.168.234.47 192.168.234.57备用

    让10.0.0.200的ip优先分配至192.168.234.57 192.168.234.47备用

    [root@234c37 ~]# vim /etc/keepalived/keepalived.conf
    ! Configuration File for keepalived
    global_defs {
     notification_email {
      root@localhost
     }
     notification_email_from keepalived@localhost
     smtp_server 127.0.0.1
     smtp_connect_timeout 30
     router_id kptwo
     vrrp _mcast_group4 234.10.10.10
    }
    vrrp_instance VI_1 {
     state BACKUP
     interface ens37
     virtual_router_id 50
     priority 80
     advert_int 1
     authentication {
      auth_type PASS
      auth_pass 1111
     }
     virtual_ipaddress {
      10.0.0.100/24
     }
    }
    virtual_server 10.0.0.100 80 {
     delay_loop 6
     lb_algo wrr
     lb_kind DR
     #persistence_timeout 50
     protocol TCP
     sorry_server 127.0.0.1:80
     real_server 192.168.234.47 80 {
      weight 1
      HTTP_GET {
       url {
        path /
        status_code 200
       }
       connect_timeout 3
       nb_get_retry 3
       delay_before_retry 3
      }
     }
     real_server 192.168.234.57 80 {
      weight 2
      HTTP_GET {
       url {
        path /
        status_code 200
       }
       connect_timeout 3
       nb_get_retry 3
       delay_before_retry 3
      }
     }
    }
    

    后端real_server准备

    修改192.168.234.57的vip为10.0.0.200/32

      1 [root@234c27 keepalived]# ipvsadm -Ln
      2 IP Virtual Server version 1.2.1 (size=4096)
      3 Prot LocalAddress:Port Scheduler Flags
      4   -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
      5 TCP  10.0.0.100:80 wrr
      6   -> 192.168.234.47:80            Route   1      0          0
      7 TCP  10.0.0.200:80 wrr
      8   -> 192.168.234.57:80            Route   1      0          0
    

    图片 5

    现在宕掉一个lvs

      1 [root@234c27 keepalived]# systemctl stop keepalived.service
      2 [root@234c27 keepalived]# ipvsadm -Ln
      3 IP Virtual Server version 1.2.1 (size=4096)
      4 Prot LocalAddress:Port Scheduler Flags
      5   -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
      6 
    

    图片 6

    依然提供服务

      1 [root@234c37 ~]# ipvsadm -Ln
      2 IP Virtual Server version 1.2.1 (size=4096)
      3 Prot LocalAddress:Port Scheduler Flags
      4   -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
      5 TCP  10.0.0.100:80 wrr
      6   -> 192.168.234.47:80            Route   1      0          21
      7 TCP  10.0.0.200:80 wrr
      8   -> 192.168.234.57:80            Route   1      0          39
    

    后一个实现基于前一个的基础上修改来的

    查看keepalived

    假设要实现sorry_server

    1.把rs服务都停掉。然后在lvs上安装apache或者nginx服务

    2.将keepalived配置文件中的

      1 virtual_server 10.0.0.200 80 {
      2     delay_loop 6
      3     lb_algo wrr
      4     lb_kind DR
      5     #persistence_timeout 50
      6     protocol TCP
      7     #sorry_server 127.0.0.1:80  //这一行来修改 写出服务出错之后的页面
      8     real_server 192.168.234.57 80 {
      9         weight 1
     10         HTTP_GET {
     11             url {
     12               path /
     13               status_code 200
     14             }
     15             connect_timeout 3
     16             nb_get_retry 3
     17             delay_before_retry 3
     18         }
     19     }
     20 }
    
    [root@234c37 ~]# systemctl status keepalived
    ● keepalived.service - LVS and VRRP High Availability Monitor
     Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
     Active: inactive (dead)
    …………
    [root@234c37 ~]# ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
     -> RemoteAddress:Port   Forward Weight ActiveConn InActConn
    //暂无ipvsadm
    

    启动服务

    图片 7

    [root@234c27 keepalived]# systemctl start keepalived.service
    [root@234c27 keepalived]# systemctl status keepalived.service
    ● keepalived.service - LVS and VRRP High Availability Monitor
     Loaded: loaded (/usr/lib/systemd/system/keepalived.service; disabled; vendor preset: disabled)
     Active: active (running) since Fri 2018-08-31 20:30:02 CST; 12s ago
     Process: 9657 ExecStart=/usr/sbin/keepalived $KEEPALIVED_OPTIONS (code=exited, status=0/SUCCESS)
     Main PID: 9658 (keepalived)
    ………………
    [root@234c27 keepalived]# ipvsadm -Ln
    IP Virtual Server version 1.2.1 (size=4096)
    Prot LocalAddress:Port Scheduler Flags
     -> RemoteAddress:Port   Forward Weight ActiveConn InActConn
    TCP 10.0.0.100:80 wrr
     -> 192.168.234.47:80   Route 1  0   0
     -> 192.168.234.57:80   Route 2  0   0
    //启动服务lvs vs已配置好
    

    后端real_server准备

    增加ip在网卡上 修改限制arp通告及应答级别 rs1 rs2都做,网关并指向路由

    ip a a 10.0.0.100/32 dev ens37
    echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
    route add default gw 192.168.234.17
    

    安装httpd服务 写好网页文件

    启动服务

    image

    多主模型IPVS示例

    图片 8

    配置keepalive

    高可用的ipvs集群示例:修改keepalived配置文件

    修改主机:192.168.234.27的keepalived配置文件

    [root@234c27 keepalived]# vim /etc/keepalived/keepalived.conf
    global_defs {
      notification_email {
       root@localhost
      }
      notification_email_from keepalived@localhost
      smtp_server 127.0.0.1
      smtp_connect_timeout 30
      router_id kpone
      vrrp _mcast_group4 234.10.10.10
    }
    vrrp_instance VI_1 {
      state MASTER
      interface ens37
      virtual_router_id 50
      priority 100
      advert_int 1
      authentication {
        auth_type PASS
        auth_pass 1111
      }
      virtual_ipaddress {
        10.0.0.100/24
      }
    }
    vrrp_instance VI_2 {
      state BACKUP
      interface ens37
      virtual_router_id 51
      priority 80
      advert_int 1
      authentication {
        auth_type PASS
        auth_pass 2222
      }
      virtual_ipaddress {
        10.0.0.200/24
      }
    }
    virtual_server 10.0.0.100 80 {
      delay_loop 6
      lb_algo wrr
      lb_kind DR
      #persistence_timeout 50
      protocol TCP
      #sorry_server 127.0.0.1:80
      real_server 192.168.234.47 80 {
        weight 1
        HTTP_GET {
          url {
           path /
           status_code 200
          }
          connect_timeout 3
          nb_get_retry 3
          delay_before_retry 3
        }
      }
    }
    virtual_server 10.0.0.200 80 {
      delay_loop 6
      lb_algo wrr
      lb_kind DR
      #persistence_timeout 50
      protocol TCP
      #sorry_server 127.0.0.1:80
      real_server 192.168.234.57 80 {
        weight 1
        HTTP_GET {
          url {
           path /
           status_code 200
          }
          connect_timeout 3
          nb_get_retry 3
          delay_before_retry 3
        }
      }
    }
    

    修改主机:192.168.234.37的keepalived配置文件

    [root@234c37 ~]# vim /etc/keepalived/keepalived.conf
    ! Configuration File for keepalived
    global_defs {
      notification_email {
       root@localhost
      }
      notification_email_from keepalived@localhost
      smtp_server 127.0.0.1
      smtp_connect_timeout 30
      router_id kptwo
      vrrp _mcast_group4 234.10.10.10
    }
    vrrp_instance VI_1 {
      state BACKUP
      interface ens37
      virtual_router_id 50
      priority 80
      advert_int 1
      authentication {
        auth_type PASS
        auth_pass 1111
      }
      virtual_ipaddress {
        10.0.0.100/24
      }
    }
    vrrp_instance VI_2 {
      state MASTER
      interface ens37
      virtual_router_id 51
      priority 100
      advert_int 1
      authentication {
        auth_type PASS
        auth_pass 2222
      }
      virtual_ipaddress {
        10.0.0.200/24
      }
    }
    virtual_server 10.0.0.100 80 {
      delay_loop 6
      lb_algo wrr
      lb_kind DR
      #persistence_timeout 50
      protocol TCP
      #sorry_server 127.0.0.1:80
      real_server 192.168.234.47 80 {
        weight 1
        HTTP_GET {
          url {
           path /
           status_code 200
          }
          connect_timeout 3
          nb_get_retry 3
          delay_before_retry 3
        }
      }
    }
    virtual_server 10.0.0.200 80 {
      delay_loop 6
      lb_algo wrr
      lb_kind DR
      #persistence_timeout 50
      protocol TCP
      #sorry_server 127.0.0.1:80
      real_server 192.168.234.57 80 {
        weight 1
        HTTP_GET {
          url {
           path /
           status_code 200
          }
          connect_timeout 3
          nb_get_retry 3
          delay_before_retry 3
        }
      }
    }
    

    让10.0.0.100的ip优先分配至192.168.234.47 192.168.234.57备用

    让10.0.0.200的ip优先分配至192.168.234.57 192.168.234.47备用

    后端real_server准备

    修改192.168.234.57的vip为10.0.0.200/32

      [root@234c27 keepalived]# ipvsadm -Ln
      IP Virtual Server version 1.2.1 (size=4096)
      Prot LocalAddress:Port Scheduler Flags
       -> RemoteAddress:Port      Forward Weight ActiveConn InActConn
      TCP 10.0.0.100:80 wrr
       -> 192.168.234.47:80      Route  1   0     0
      TCP 10.0.0.200:80 wrr
      -> 192.168.234.57:80      Route  1   0     0
    

    现在宕掉一个lvs

    图片 9

      [root@234c27 keepalived]# systemctl stop keepalived.service
      [root@234c27 keepalived]# ipvsadm -Ln
      IP Virtual Server version 1.2.1 (size=4096)
      Prot LocalAddress:Port Scheduler Flags
      -> RemoteAddress:Port      Forward Weight ActiveConn InActConn
    

    依然提供服务

    图片 10

     [root@234c37 ~]# ipvsadm -Ln
     IP Virtual Server version 1.2.1 (size=4096)
      Prot LocalAddress:Port Scheduler Flags
      -> RemoteAddress:Port      Forward Weight ActiveConn InActConn
      TCP 10.0.0.100:80 wrr
       -> 192.168.234.47:80      Route  1   0     21
      TCP 10.0.0.200:80 wrr
       -> 192.168.234.57:80      Route  1   0     39
    

    后一个实现基于前一个的基础上修改来的

    假设要实现sorry_server

    1.把rs服务都停掉。然后在lvs上安装apache或者nginx服务

    2.将keepalived配置文件中的

    virtual_server 10.0.0.200 80 {
      delay_loop 6
      lb_algo wrr
      lb_kind DR
      #persistence_timeout 50
      protocol TCP
      #sorry_server 127.0.0.1:80 //这一行来修改 写出服务出错之后的页面
      real_server 192.168.234.57 80 {
        weight 1
        HTTP_GET {
          url {
           path /
           status_code 200
          }
          connect_timeout 3
          nb_get_retry 3
          delay_before_retry 3
        }
      }
    }
    

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