CentOS7 Keepalived+LVS 实现高可用

系统环境：

     操作系统：Centos7.2

     依赖软件：net-tools

网络环境：

    Keepalived Master：192.168.5.251

    Keepalived Backup：192.168.5.252

    VIP： 192.168.5.100

    RIP： 192.168.5.254   

Keepalived Master

! Configuration File for keepalived
global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 1
   weight 2
}

vrrp_instance VI_1 {
    state MASTER
    interface eno16777736
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    }
    virtual_ipaddress {
        192.168.5.100/24 label eno16777736:0
    }
    track_script {
        chk_mantaince_down
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault  "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.5.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.255
    persistence_timeout 50
    protocol TCP
#
   real_server 192.168.5.254 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
        }
   }
}

Keepalived Backup

! Configuration File for keepalived
global_defs {
   notification_email {
     [email protected]
     [email protected]
     [email protected]
   }
   notification_email_from [email protected]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script chk_mantaince_down {
   script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0"
   interval 1
   weight 2
}

vrrp_instance VI_1 {
    state BACKUP
    interface eno16777736
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
    }
    virtual_ipaddress {
        192.168.5.100/24 label eno16777736:0
    }
    track_script {
        chk_mantaince_down
    }
    notify_master "/etc/keepalived/notify.sh master"
    notify_backup "/etc/keepalived/notify.sh backup"
    notify_fault  "/etc/keepalived/notify.sh fault"
}
virtual_server 192.168.5.100 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.255
    persistence_timeout 50
    protocol TCP
#
   real_server 192.168.5.254 80 {
        weight 1
        HTTP_GET {
            url {
              path /
              status_code 200
            }
        }
   }
}

Real Script

#!/bin/bash
#!/bin/bash
#chkconfig: 2345 79 20
#description:LVS realserver
DR_VIP=192.168.5.100
 
case "$1" in
start)
   /sbin/ifconfig lo:0 $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP
   /sbin/route add -host $SNS_VIP dev lo:0
   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
   sysctl -p >/dev/null 2>&1
   echo "LVS RealServer Start OK"
;;
stop)
   ifconfig lo:0 down
   route del $SNS_VIP >/dev/null 2>&1
   echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
   echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
   echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
   echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
   echo "LVS RealServer Stoped"
;;
*)
   echo "Usage: $0 {start|stop}"
   exit 1
esac

notify Scrip

# !/bin/bash
# Author: MageEdu <[email protected]>
# description: An example of notify script
#
vip=172.16.100.1
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 $mailbody | mailx -s "$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