keepalived+lvs配置sorryserver

keepalived+lvs配置sorryserver

當配置在lvs上的rs都沒法訪問到時，就須要有一臺備用的服務器來提供報錯頁面，此服務器稱爲sorry_server。

配置sorry_server

準備主機4臺

server	hostname	ip
keepalived	s1	172.20.27.10
sorryserver	web3	172.20.27.13
nginx	web1	172.20.27.20
nginx	web2	172.20.27.21

---

1.修改keepalived配置文件

virtual_server 172.20.27.100 80 {
    delay_loop 6
    lb_algo wrr
    lb_kind DR
    protocol TCP
    sorry_server 172.20.27.13 80        #配置sorry_server的地址和端口
    real_server 172.20.27.20 80 {
        weight 1
        HTTP_GET {
            url {
                path /monitor-page/index.html
                status_code 200
        }
            nb_get_retry 3
            delay_before_retry 3
            connect_timeout 5
    }
}
    real_server 172.20.27.21 80 {
        weight 1
        HTTP_GET {
            url {
                path /monitor-page/index.html
                status_code 200
            }
            nb_get_retry 3
            delay_before_retry 3
            connect_timeout 5
        }
    }
}

2.重啓服務器查看lvs規則

#因爲後端web1和web2服務沒有啓動，通過一段時間檢測後，沒法探測到主機就下線了，27.12的sorryserver上線提供服務
[root@s1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.20.27.100:80 wrr
  -> 172.20.27.20:80              Route   1      0          0         
  -> 172.20.27.21:80              Route   1      0          0         
[root@s1 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  172.20.27.100:80 wrr
  -> 172.20.27.12:80              Route   1      0          0

3.sorryserver上建立頁面

[root@s3 ~]# echo 'sorry!' > /var/www/html/index.html

4.在sorryserver上綁定vip地址

[root@web3 ~]# bash lvs_dr_rs.sh start
[root@web3 ~]# cat lvs_dr_rs.sh 
#!/bin/bash
vip=172.20.27.100
mask='255.255.255.255'
dev=lo:1
case $1 in
start)
    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
    ifconfig $dev $vip netmask $mask #broadcast $vip up
    #route add -host $vip dev $dev
    echo "The RS Server is Ready!"
    ;;
stop)
    ifconfig $dev down
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce
    echo "The RS Server is Canceled!"
    ;;
*)
    echo "Usage: $(basename $0) start|stop"
    exit 1
    ;;
esac

5.在客戶端上測試訪問

[root@client ~]# curl www.mylinuxops.com
sorry\!
#sorryserver開始提供服務