Keepalived+Nginx负载均衡+web实验

Posted 2022-02-14 林炜玮_51CTO

实验拓扑

实验目的为了实现nginx实现负载均衡和keepalived高可用，从而保障web1和web2提供的服务

nginx172.16.10.11

安装nginx keepalived

dnf -y install nginx keepalived;systemctl enable --now nginx keepalived   #172.16.10.12设备同时安装，方便远程传文件
systemctl status nginx keepalived  #检查状态，有问题的请查看错误日志

配置nginx

vim /etc/nginx/nginx.conf  #具体配置看下面图一
scp /etc/nginx/nginx.conf root@172.16.10.12:/etc/nginx/nginx.conf

图一：nginx.conf配置

配置keepalived

步骤梳理：

1. vim /etc/keepalived/keepalived.conf
2. mkdir /etc/keepalived/conf.d/ -pv
   
3. vim /etc/keepalived/conf.d/keepalived.conf

vim /etc/keepalived/keepalived.conf
#文本内容
   vrrp_gna_interval 0
! Configuration File for keepalived
  
global_defs 
   notification_email 
     [e-mail]
     [e-mail]
     [e-mail]
   
   notification_email_from [e-mail]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id ka1.linweiwei.com
   vrrp_skip_check_adv_addr
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0


include /etc/keepalived/conf.d/*conf
#保存退出

mkdir /etc/keepalived/conf.d/ -pv
vim /etc/keepalived/conf.d/keepalived.conf
#文本内容
vrrp_instance keepalived 
        state MASTER
        interface eth0
        virtual_router_id 61
        priority 100
        advert_int 1
        authentication 
                auth_type PASS
                auth_pass 123456
        
        virtual_ipaddress 
                172.16.10.200/24 dev eth0 label eth0:1
        
        notify_master "/etc/keepalived/notify.sh master"
        notify_backup "/etc/keepalived/notify.sh backup"
        notify_fault "/etc/keepalived/notify.sh fault"
        track_script 
                check_down   #利用VRRP-Script脚本判断应用程序的健康性
        


#保存退出
scp /etc/keepalived/conf.d/keepalived.conf root@172.16.10.12:/etc/keepalived/conf.d/keepalived.conf
scp /etc/keepalived/keepalived.conf root@172.16.10.11:/etc/keepalived/keepalived.conf
systemctl restart keepalived.service
[root@Centos8 keepalived]# hostname -I
172.16.10.12 172.16.10.200    #172.16.10.200的VIP出现

nginx172.16.10.12

dnf -y install nginx keepalived;systemctl enable --now nginx keepalived
systemctl status nginx keepalived  #检查状态，有问题的请查看错误日志

vim /etc/keepalived/keepalived.conf
router_id ka1.linweiwei.com  改成router_id ka2.linweiwei.com
vim /etc/keepalived/conf.d/keepalived.conf
state MASTER 改成state BACKUP
virtual_router_id 61 改成virtual_router_id 62
priority 80
#保存退出

systemctl restart keepalived.service

配置web1 172.16.10.8

yum -y install httpd;systemctl enable --now httpd 
echo "This is Keepalived+Nginx+web test by web1_172.16.10.8 "  > /var/www/html/index.html

配置web2 172.16.10.9

yum -y install httpd;systemctl enable --now httpd 
echo "This is Keepalived+Nginx+web test by web2_172.16.10.9 "  > /var/www/html/index.html

配置客户机

测试结果

负载均衡web1和web2正常

高可用部分，我们模拟172.16.10.11故障关机

关机前VIP的情况
[root@Centos8 keepalived]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:1b:67:3f brd ff:ff:ff:ff:ff:ff
    inet 172.16.10.11/24 brd 172.16.10.255 scope global noprefixroute eth0
       valid_lft forever preferred_lft forever
    inet 172.16.10.200/24 scope global secondary eth0:1
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe1b:673f/64 scope link 
       valid_lft forever preferred_lft forever

172.16.10.11故障关机后，172.16.10.12获得VIP，我们再看看网页情况，收官~