LVS_Director + KeepAlived
 
KeepAlived在該項(xiàng)目中的功能：
1. 管理IPVS的路由表（包括對(duì)RealServer做健康檢查）
2. 實(shí)現(xiàn)調(diào)度器的HA
http://www.keepalived.org
 
Keepalived所執(zhí)行的外部腳本命令建議使用絕對(duì)路徑
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實(shí)施步驟：
1. 主/備調(diào)度器安裝軟件
[root@lvs-keepalived-master ~]# yum -y install ipvsadm keepalived 
[root@lvs-keepalived-slave ~]# yum -y install ipvsadm keepalived
2. Keepalived
lvs-master
[root@ha-proxy-master ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
 
global_defs {
   router_id lvs-keepalived-master    #輔助改為lvs-backup
}
 
vrrp_instance VI_1 {
    state MASTER
    interface ens33                #VIP綁定接口
    virtual_router_id 80         #VRID 同一組集群，主備一致          
    priority 100            #本節(jié)點(diǎn)優(yōu)先級(jí)，輔助改為50
    advert_int 1            #檢查間隔，默認(rèn)為1s
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.246.110/32
    }
}
 
virtual_server 192.168.246.110 80 {    #LVS配置
	delay_loop 6   #健康檢查rs時(shí)間間隔
	lb_algo rr     #LVS調(diào)度算法
	lb_kind DR     #LVS集群模式（路由模式）
	protocol TCP      #健康檢查使用的協(xié)議
	real_server 192.168.246.162 80 {
		weight 1
		inhibit_on_failure   #當(dāng)該節(jié)點(diǎn)失敗時(shí)，把權(quán)重設(shè)置為0，而不是從IPVS中刪除
		TCP_CHECK {          #健康檢查
			connect_port 80   #檢查的端口
			connect_timeout 3  #連接超時(shí)的時(shí)間
			}
		}
	real_server 192.168.246.163 80 {
		weight 1
		inhibit_on_failure
		TCP_CHECK {
			connect_timeout 3
			connect_port 80
			}
		}
}
 
[root@lvs-keepalived-slave ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
 
global_defs {
   router_id lvs-keepalived-slave
}
 
vrrp_instance VI_1 {
    state BACKUP
    interface ens33
    virtual_router_id 80
    priority 50
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.246.110/24
    }
}
virtual_server 192.168.246.110 80 {
	delay_loop 6
	lb_algo rr
	lb_kind DR
	protocol TCP
	real_server 192.168.246.162 80 {
		weight 1
		inhibit_on_failure
		TCP_CHECK {
			connect_port 80
			connect_timeout 3
			}
		}
	real_server 192.168.246.163 80 {
		weight 1
		inhibit_on_failure
		TCP_CHECK {
			connect_timeout 3
			connect_port 80
			}
		}
}
3. 啟動(dòng)KeepAlived（主備均啟動(dòng)）
[root@lvs-keepalived-master ~]# systemctl start keepalived
[root@lvs-keepalived-master ~]# systemctl enable keepalived
 
[root@lvs-keepalived-master ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  192.168.246.110:80 rr persistent 20
  -> 192.168.246.162:80           Route   1      0          0         
  -> 192.168.246.163:80           Route   0      0          0
 
4. 所有RS配置(nginx1,nginx2)
配置好網(wǎng)站服務(wù)器，測試所有RS
[root@test-nginx1 ~]# yum install -y nginx
[root@test-nginx2 ~]# yum install -y nginx
[root@test-nginx1 ~]# ip addr add dev lo 192.168.246.110/32
[root@test-nginx1 ~]# echo "net.ipv4.conf.all.arp_ignore = 1" >> /etc/sysctl.conf
[root@test-nginx1 ~]# sysctl -p
[root@test-nginx1 ~]# echo "web1..." >> /usr/share/nginx/html/index.html
[root@test-nginx1 ~]# systemctl start nginx

` systemctl start keepalived  `