目录

• 实验一：实现keepalived主从方式高可用基于LVS-DR模式的应用实战：
  • 1、环境准备：
  • 2、在lvs-server-master 主上
  • 3、在lvs-server-backup 从上
  • 4、在real server 上
  • 5、测试
• 实验二：实现keepalived双主方式高可用基于LVS-DR模式的应用实战：
  • 1、实验环境，基本同上
  • 2、在lvs-server1 上，基本同上，就是加了一个实例段
  • 3、在lvs-server2 上，基本同1，就是把实例的主从调换一下
  • 4、在real server 上
  • 5、测试
• 实验三：实现keepalived主从方式高可用基于LVS-NAT模式的应用实战：
  • 1、环境准备
  • 2、在lvs-server-master 主上
  • 4、在real server 上
  • 5、测试
• 实验四：实现keeaplived 故障通知机制
  • 1、编写好脚本
  • 2、在keepalived 的配置文件调用脚本
• 实验五：实现keepaplived自定义脚本检测功能
  • 方案一：检测是否存在down文件，来实现主从的调整
  • 方案二：检测nginx服务是否开启，来实现调整主从

① 全局段，故障通知邮件配置

global_defs {

   notification_email {

        root@localhost

   }

   notification_email_from root@along.com

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id keepalived_lvs

}

② 配置虚拟路由器的实例段，VI_1是自定义的实例名称，可以有多个实例段

vrrp_instance VI_1 {    　#VI_1是自定义的实例名称

    state MASTER   　　 　 #初始状态，MASTER|BACKUP

    interface eth1 　　 　 #通告选举所用端口

    virtual_router_id 51  #虚拟路由的ID号（一般不可大于255）

    priority 100  　　　　　#优先级信息 #备节点必须更低

    advert_int 1  　　　　　#VRRP通告间隔，秒

    authentication {

        auth_type PASS    #认证机制

        auth_pass along   #密码（尽量使用随机）

    }

    virtual_ipaddress {
172.17.100.100   　#vip

    }

}

③ 设置一个virtual server段

virtual_server 172.17.100.100 80 {   #设置一个virtual server:

    delay_loop 6   # service polling的delay时间，即服务轮询的时间间隔

    lb_algo wrr　　　 #LVS调度算法：rr|wrr|lc|wlc|lblc|sh|dh

    lb_kind DR　　　　#LVS集群模式：NAT|DR|TUN

    nat_mask 255.255.255.255

    persistence_timeout 600  #会话保持时间（持久连接，秒），即以用户在600秒内被分配到同一个后端realserver

    protocol TCP   　#健康检查用的是TCP还是UDP

④ real server设置段

    real_server 172.17.1.7 80 { #后端真实节点主机的权重等设置

        weight 1  #给每台的权重，rr无效

        HTTP_GET {  #http服务

            url {

              path /

            }

            connect_timeout 3    #连接超时时间

            nb_get_retry 3　　    #重连次数

            delay_before_retry 3 #重连间隔

        }

    }

    real_server 172.17.22.22 80 {

        weight 2

        HTTP_GET {

            url {

              path /

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

}

vrrp_instance VI_1 {

    state BACKUP

    interface eth1

    virtual_router_id 51

    priority 99

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass along

    }

net.ipv4.conf.lo.arp_ignore = 1

net.ipv4.conf.lo.arp_announce = 2

net.ipv4.conf.all.arp_ignore = 1

net.ipv4.conf.all.arp_announce = 2

vrrp_instance VI_1 {

    state MASTER

    interface eth1

    virtual_router_id 51

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass along

    }

    virtual_ipaddress {

        172.17.100.100

    }

}

virtual_server 172.17.100.100 80 {

    delay_loop 6

    lb_algo wrr

    lb_kind DR

    nat_mask 255.255.255.255

    persistence_timeout 600

    protocol TCP

    real_server 172.17.1.7 80 {

        weight 1

        HTTP_GET {

            url {

              path /

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

    real_server 172.17.22.22 80 {

        weight 1

        HTTP_GET {

            url {

              path /

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

}

vrrp_instance VI_2 {

    state BACKUP

    interface eth1

    virtual_router_id 52

    priority 98

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass along

    }

    virtual_ipaddress {

        172.17.100.101

    }

}

virtual_server 172.17.100.101 443 {

    delay_loop 6

    lb_algo wrr

    lb_kind DR

    nat_mask 255.255.255.255

    persistence_timeout 600

    protocol TCP

    real_server 172.17.1.7 443 {

        weight 1

        HTTP_GET {

            url {

              path /

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

    real_server 172.17.22.22 443 {

        weight 1

        HTTP_GET {

            url {

              path /

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

}

① vrrp_instance VI_1 {

    state BACKUP

    interface eth1

    virtual_router_id 51

    priority 98

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass along

    }

    virtual_ipaddress {

        172.17.100.100

    }

}

② vrrp_instance VI_2 {

    state MASTER

    interface eth1

    virtual_router_id 52

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass along

    }

    virtual_ipaddress {

        172.17.100.101

    }

}

global_defs {

   notification_email {

        root@localhost

   }

   notification_email_from root@along.com

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id keepalived_lvs

}

vrrp_instance VI_1 {

    state MASTER

    interface eth0

    virtual_router_id 51

    priority 100

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass along

    }

    virtual_ipaddress {

       172.17.100.100

192.168.30.100

    }

}

virtual_server 172.17.100.100 80 {

    delay_loop 6

    lb_algo wrr

    lb_kind NAT

    nat_mask 255.255.255.255

    persistence_timeout 100

    protocol TCP

    real_server 192.168.30.107 80 {

        weight 1

        HTTP_GET {

            url {

              path /

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

    real_server 192.168.30.7 80 {

        weight 2

        HTTP_GET {

            url {

              path /

            }

            connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

}

vrrp_instance VI_1 {

    state BACKUP

    interface eth1

    virtual_router_id 51

    priority 99

    advert_int 1

    authentication {

        auth_type PASS

        auth_pass along

    }

#!/bin/bash

# Author: www.magedu.com

contact='root@localhost'

notify() {

        mailsubject="$(hostname) to be $1: vip floating"

        mailbody="$(date +'%F %H:%M:%S'): vrrp transition, $(hostname) changed to be $1"

        echo $mailbody | mail -s "$mailsubject" $contact

}

case $1 in

master)

        notify master

        exit 0

;;

backup)

        notify backup

        exit 0

;;

fault)

        notify fault

        exit 0

;;

*)

        echo "Usage: $(basename $0) {master|backup|fault}"

        exit 1

;;

esac

notify_backup "/etc/keepalived/notify.sh backup"

notify_master "/etc/keepalived/notify.sh master"

notify_fault "/etc/keepalived/notify.sh fault"

vrrp_script chk_down {    #定义一个脚本，脚本名称为chk_down

 　　script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"   #检查这个down文件，若存在返回值为1，keepalived会停止；不存在返回值为0，服务正常运行；这里的exit和bash脚本里的return很相似

 interval 2   #每2秒检查一次
}

track_script {

    chk_down

}

vrrp_script chk_nginx {

     script "killall -0 nginx" #killall -0 检测这个进程是否还活着，不存在就减权重

     interval 2 #每2秒检查一次

     fall 2 #失败2次就打上ko的标记

     rise 2 #成功2次就打上ok的标记

     weight -4 #权重，优先级-4，若为ko

}

track_script {

    chk_nginx

}