Linux keepalived高可用集群+keepaliced+LVS

keepalived+lvs集群

环境准备
拓扑：

192.168.0.116 dr1 负载均衡器
192.168.0.117 dr2 负载均衡器
192.168.0.118 rs1 web1
192.168.0.119 rs2 web2

1.在master上安装配置Keepalived:

yum install keepalived  ipvsadm -y		#ipvsadm安装并不启动

2.在master上修改配置文件

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived
global_defs {						
	router_id Director1    #两边不一样
	}
	
vrrp_instance VI_1 {				
	state MASTER				#另外一台机器是BACKUP	
	interface ens32				#心跳网卡	
	virtual_router_id 51			#虚拟路由编号，主备要一致
	priority 150				#优先级	
	advert_int 1				#检查间隔，单位秒	
	authentication {
		auth_type PASS
		auth_pass 1111
		}
	virtual_ipaddress {
		192.168.0.20/24 dev ens32	#VIP和工作端口
		}
	}
	
virtual_server 192.168.0.20 80 {		#LVS 配置，VIP
	delay_loop 3				#服务论询的时间间隔
	lb_algo rr				#LVS 调度算法
	lb_kind DR	 			#LVS 集群模式
	protocol TCP
	real_server 192.168.0.118 80 {
		weight 1
		TCP_CHECK {
			connect_timeout 3
			}
		}
	real_server 192.168.0.119 80 {
		weight 1
		TCP_CHECK {
			connect_timeout 3
			}
		}
}

3.在backup上安装keepalived:

yum install keepalived   ipvsadm -y  #ipvsadm安装并不启动

4.拷贝master上的keepalived.conf到backup上：

scp  192.168.0.116:/etc/keepalived/keepalived.conf 192.168.0.117:/etc/keepalived/

5.拷贝后,修改配置文件
router_id Director2
state BACKUP
priority 100

! Configuration File for keepalived
global_defs {
        router_id Director2
        }

vrrp_instance VI_1 {
        state BACKUP                            #另外一台机器是BACKUP
        interface ens32                         #心跳网卡
        virtual_router_id 52
        priority 100                            #优先级
        advert_int 1                            #检查间隔，单位秒
        authentication {
                auth_type PASS
                auth_pass 1111
                }
        virtual_ipaddress {
                192.168.0.20/24 dev ens32       #VIP和工作端口
                }
        }

virtual_server 192.168.0.20 80 {                #LVS 配置，VIP
        delay_loop 3                            #服务论询的时间间隔
        lb_algo rr                              #LVS 调度算法
        lb_kind DR                              #LVS 集群模式
        protocol TCP
        real_server 192.168.0.118 80 {
                weight 1
                TCP_CHECK {
                        connect_timeout 3
                        }
                }
        real_server 192.168.0.119 80 {
                weight 1
                TCP_CHECK {
                        connect_timeout 3
                        }
                }
}                                     

6.master和backup上启动服务:

systemctl enable keepalived
systemctl start keepalived
reboot

7.web服务器配置
web1和web2同配置
（1）安装web测试站点

yum install -y httpd && systemctl start httpd && systemctl enable httpd

（2）配置虚拟地址

#cp /etc/sysconfig/network-scripts/{ifcfg-lo,ifcfg-lo:0}
#vim /etc/sysconfig/network-scripts/ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.0.20
NETMASK=255.255.255.255
ONBOOT=yes
#其他行注释掉

（3）配置路由

#vim /etc/rc.local
/sbin/route add host 192.168.0.20 dev lo:0

（4）配置ARP

vim /etc/sysctl.conf

net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2

reboot

8.测试：
1）观察lvs路由条目
master上 查询
# ipvsadm -L

IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
  -> RemoteAddress:Port           Forward Weight ActiveConn InActConn
TCP  localhost.localdomain:http rr
  -> 192.168.0.124:http           Route   1      0          0    

2）观察vip地址在哪台机器上
master上 查询 # ip a

ens32: 
    inet 192.168.0.120/24 brd 192.168.0.255 scope global dynamic ens32

    inet 192.168.0.20/32 scope global ens32

3）客户端浏览器访问vip
访问正常
4）关闭master上的keepalived服务，再次访问vip

master上 关闭 # systemctl stop keepalived.service 

5）关闭web1站点服务，再次访问VIP
访问正常