Nginx + keepalived联动部署

一个合格的集群应该具备以下哪些特征:

1. 负载均衡:LVS , Nginx ,Haproxy ,F5
2. 健康检查 : for 调度器/节点服务器 Keepalived Heartbeat
3. 故障转移 主备切换 : Keepalived解决

操作内容

7-1：nginx+keepalived 联动1 7-5：nginx+keepalived 联动2 7-2 nginx web服务1 7-3 nginx web服务2 7-4 nfs文件共享服务

注:7-2 ; 7-3; 7-4;再LVS+DR模式那边有详细步骤这里不做多余阐述

1.先配置7-1,7-5nginx反向代理

关闭防火墙 nginx反向代理两台机器关闭

两台机器安装nginx

mount /dev/sr0 /mnt

cd /etc/yum.repos.d/


[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=1
enabled=1
gpgkey=https://nginx.org/keys/nginx_signing.key
module_hotfixes=true

yum -y install nginx

🥟

7-5与7-1同样的操作安装nginx

[root@localhost ~]# vim /etc/yum.repos.d/nginx.repo
[root@localhost ~]# yum -y install nginx

通过yum安装的自带yum模块 nginx -V查看

去7-1nginx配置

cd  /etc/nginx/
vim  nginx.conf 


stream {
       upstream backend {
           server  192.168.47.102:80;
          server  192.168.47.103:80;
          }
 
server {
         listen 8080;
          proxy_pass backend;
     }
  
 }

#用nginx -t检测语法是否有问题

#用netstat查看
nginx是否被误开启，先判断是否是systemctl start开启的，不是就killall nginx
然后再用systemctl start nginx开启，通过systemctl管理
netstat -lntp |grep nginx

🍗

验证访问

192.168.47.100:8080/test.html

scp nginx.conf 192.168.47.105:`pwd`
#将7-1的配置文件，远程拷贝到7-5去

接下来去配置7-5的nginx

systemctl start nginx
#开启nginx

验证

2.两台nginx联合做高可用,实现故障转移

去7-1，7-5安装keepalived

yum -y install keepalived.x86_64 
#安装高可用软件

更改keepalived配置

7-1:

  然后启动keepalived服务

3.实现 健康检查配置

写一个脚本当nginx一台挂了,会自动将其拉起来

cd /etc/keepalived/
vim check_nginx.sh

#!/bin/bash
if ! killall -0 nginx &> /dev/null
then
systemctl stop keepalived
fi

systemctl start nginx
systemctl status nginx
#启动nginx

chmod +x check_nginx.sh
#给脚本加执行权限

./check_nginx.sh
#执行脚本

再去修改配置文件

vrrp_script check_nginx { 
 script "/etc/keepalived/check_nginx.sh" 
      interval 2
        weight -5 
        }

track_script { 
check_nginx
}

将7-1的check_nginx.sh keepalived.conf远程拷贝到7-5

scp check_nginx.sh  keepalived.conf 192.168.47.105:`pwd`

去7-5修改配置文件

先启动7-1,7-5的nginx

再启动7-1,7-5的leepalived

先启动keepalived 会导致运行脚本 关闭nginx,nginx被关闭所以keepalived跟着就会被关闭,所以要先启动nginx,在启动keepalived

注意启动顺序

查看vipd地址是否出现

测试访问vip地址

http://192.168.47.200:8080/test.html

假如现在nginx的主异常关闭了

关闭7-1ngin 服务
systemctl stop nginx

keepalived 随着nginx关闭也跟着一起关闭了

去7-5 ip a查看vip第地址是否存在

测试不受影响正常访问