keepalived 实现LVS的高可用性-配置简介

常用参数
　　delay_loop <INT>：检查后端服务器的时间间隔
　　lb_algo rr|wrr|lc|wlc|lblc|sh|dh：定义调度方法
　　lb_kind NAT|DR|TUN：集群的类型
　　persistence_timeout <INT>：持久连接时长
　　protocol TCP：服务协议，仅支持TCP
　　sorry_server <IPADDR> <PORT>：所有RS故障时，备用服务器地址
　　real_server <IPADDR> <PORT>
{
weight <INT> RS权重
notify_up <STRING>|<QUOTED-STRING> RS上线通知脚本
notify_down <STRING>|<QUOTED-STRING> RS下线通知脚本
HTTP_GET|SSL_GET|TCP_CHECK|SMTP_CHECK|MISC_CHEC K { ... }：定义当前主机的健康状态检测方法
}

HTTP_GET|SSL_GET：应用层检测
　　HTTP_GET|SSL_GET {
　　　　url {
　　　　　　path <URL_PATH>：定义要监控的URL
　　　　　　status_code <INT>：判断上述检测机制为健康状态的响应码
　　　　　　digest <STRING>：判断为健康状态的响应的内容的校验码
　　　　}
　　connect_timeout <INTEGER>：连接请求的超时时长
　　nb_get_retry <INT>：重试次数
　　delay_before_retry <INT>：重试之前的延迟时长
　　connect_ip <IP ADDRESS>：向当前RS哪个IP地址发起健康状态检测请求
　　connect_port <PORT>：向当前RS的哪个PORT发起健康状态检测请求
　　bindto <IP ADDRESS>：发出健康状态检测请求时使用的源地址
　　bind_port <PORT>：发出健康状态检测请求时使用的源端口
}

一、从模板文件中复制

virtual_server 10.10.10.2 1358 {
    delay_loop 6
    lb_algo rr
    lb_kind NAT
    persistence_timeout 50
    protocol TCP

    sorry_server 192.168.200.200 1358

    real_server 192.168.200.2 1358 {
        weight 1
        HTTP_GET {
            url {
              path /testurl/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl2/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            url {
              path /testurl3/test.jsp
              digest 640205b7b0fc66c1ea91c463fac6334d
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

二、修改配置文件

　　1、virtual_server 修改为ＶＩＰ地址

virtual_server 192.168.1.100 80 {

　　2、轮循

  lb_algo rr

　　3、DR模型

 lb_kind DR

　　4、持久连接

 persistence_timeout 50

　　5、提供道歉页面的服务器地址，本机地址

 sorry_server 127.0.0.1 80

　　6、RS信息

real_server 192.168.1.5 80 {

　　7、权重1

weight 1

　　8、访问根，返回状态码200

url {
              path /
              status_code 200
            }

　　9、超时时间

connect_timeout 3

　　10、重连次数

nb_get_retry 3

　　11、重试之前的延迟时长

delay_before_retry 3

　　12、主服务器的完整的配置

cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   notification_email {
    root@2382990774@qq.com
   }
   notification_email_from keepalived@2382990774@qq.com
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka1
   vrrp_mcast_group4 224.100.100.100
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 88
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
    192.168.1.100/24 dev ens33 label ens33:1
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}

virtual_server 192.168.1.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP
    sorry_server 127.0.0.1 80

    real_server 192.168.1.5 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

 real_server 192.168.1.6 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

　　13、从服务器的配置文件

cat 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 ka2
   vrrp_mcast_group4 224.100.100.100
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 88
    priority 90
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
    192.168.1.100/24 dev ens33 label ens33:1
    }    
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.1.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP
    sorry_server 127.0.0.1 80

    real_server 192.168.1.5 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }

 real_server 192.168.1.6 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
            connect_timeout 3
            nb_get_retry 3
            delay_before_retry 3
        }
    }