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1、主架构图

1.1 IP地址规划

服务器	IP地址
web1	192.168.107.193
web2	192.168.107.192
nginx1	192.168.107.12
nginx2	192.168.107.11

2、web服务器操作

注：web1和web2操作相同

#安装httpd服务yum install -y httpd
#定制特制页面
cd /var/www/html/
ls
echo "7-1" > index.html
#开启httpd服务
systemctl start httpd.service
#查看服务是否开启
[root@localhost html]# systemctl status httpd.service

结果：

web2与web1服务相同

3、配置nginx服务器的负载均衡

#安装nginx
yum install  -y  nginx
systemctl start nginx
#更改配置文件，配置upstream模块
vim   /etc/nginx/nginx.confupstream web  {server 192.168.107.193;server 192.168.107.192;}location /  {proxy_pass  http://web;}

验证负载均衡

同样的操作，我们在nginx2上配置一样

验证负载均衡

4、配置keepalived

4.1 master

#安装keepalived
yum install keepalived   -y#更改配置文件
[root@localhost ~]# vim /etc/keepalived/keepalived.conf 
#配置文件如下
global_defs {notification_email {acassen@firewall.locfailover@firewall.locsysadmin@firewall.loc}notification_email_from Alexandre.Cassen@firewall.locsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS01vrrp_skip_check_adv_addr#vrrp_strictvrrp_garp_interval 0vrrp_gna_interval 0
}vrrp_instance VI_1 {state MASTERinterface ens33virtual_router_id 51priority 100advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.107.188}
}

4.1 backup

#安装keepalived
yum install keepalived   -y#更改配置文件
[root@localhost ~]# vim /etc/keepalived/keepalived.conf 
#配置文件如下}notification_email_from Alexandre.Cassen@firewall.locsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS02vrrp_skip_check_adv_addr#vrrp_strictvrrp_garp_interval 0vrrp_gna_interval 0
}vrrp_instance VI_1 {state BACKUPinterface ens33virtual_router_id 51priority 80advert_int 1authentication {auth_type PASSauth_pass 1111}virtual_ipaddress {192.168.107.188}

5、测试双机热备

5.1 两台keepalived服务器均开启

在客户端上访问vip地址

检测流量的来源：结果为master在转发

5.2 模拟master节点故障

在master上模拟keepalived服务down掉

[root@localhost ~]# systemctl stop keepalived.service

再次访问vip地址

发现从master节点转到了backup节点

此时我们再次开启master节点上的keepalived服务

[root@localhost ~]# systemctl start keepalived.service

转发服务就会从backup上再次转到master上了