準備作業

詳細步驟和配置解釋可以參考：LVS-DR+Keepalived 高可用集群

之前寫的主要是先做lvs-dr再做keepalived 因此步驟顯得比較麻煩 今天再寫一個簡要步驟

調度器上安裝Keepalived

yum install -y ipvsadm
yum install -y keepalived

調度主機上做lvs策略

配置負載分配策略
首先清除原有策略
ipvsadm -C

添加虛擬服務器
ipvsadm -A -t 192.168.188.188:80 -s rr

添加真實服務器 作業模式為DR
ipvsadm -a -t 192.168.188.188:80 -r 192.168.188.100:80 -g
ipvsadm -a -t 192.168.188.188:80 -r 192.168.188.101:80 -g

保存
ipvsadm-save > /etc/sysconfig/ipvsadm

查看
ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.188.188:80 rr
  -> 192.168.188.100:80           Route   1      0          0         
  -> 192.168.188.101:80           Route   1      0          0 

從機不需要配置策略 因為keepalived會自動決議策略

在調度器上配置Keepalived

主機

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {
   router_id LVS1
}

vrrp_instance VI_1 {
    state MASTER
    interface ens33
    virtual_router_id 66
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.188.188
    }
}

virtual_server 192.168.188.188 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 192.168.188.100 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
        }
    }
   real_server 192.168.188.101 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
        }
    }
}

從機

! Configuration File for keepalived

global_defs {
   router_id LVS2
}

vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 66
    priority 80
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 123456
    }
    virtual_ipaddress {
        192.168.188.188
    }
}

virtual_server 192.168.188.188 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP

    real_server 192.168.188.100 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
        }
    }
   real_server 192.168.188.101 80 {
        weight 1
        TCP_CHECK {
                connect_port 80
                connect_timeout 3
                nb_get_retry 3
                delay_before_retry 4
        }
    }
}

重啟服務
systemctl restart ipvsadm
systemctl restart keepalived

查看keepalived配置完成后 ens33是否有了VIP
ip addr

從機查看策略
ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.188.188:80 rr
  -> 192.168.188.100:80           Route   1      0          0         
  -> 192.168.188.101:80           Route   1      0          0 

配置真實服務器

添加虛擬介面lo:0 配置VIP地址 
cp -a ifcfg-lo ifcfg-lo:0

vim ifcfg-lo:0

DEVICE=lo:0
IPADDR=192.168.188.188
NETMASK=255.255.255.255
NETWORK=127.0.0.0
BROADCAST=127.255.255.255
ONBOOT=yes
NAME=loopback

然后將網卡傳給另一臺web服務器
scp ./ifcfg-lo:0 root@192.168.188.101:/root

開啟虛擬介面
ifup lo:0

添加一條到VIP的本地路由
route add -host 192.168.188.188 dev lo:0

查看路由
route -n

Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         192.168.188.2   0.0.0.0         UG    100    0        0 ens33
192.168.79.0    0.0.0.0         255.255.255.0   U     101    0        0 ens37
192.168.188.0   0.0.0.0         255.255.255.0   U     100    0        0 ens33
192.168.188.188 0.0.0.0         255.255.255.255 UH    0      0        0 lo

測驗

瀏覽器輸入VIP


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