Nginx高可用的配置-Keepalived

ゝ一世哀愁。 2023-02-19 03:29 106阅读 0赞

# Nginx高可用 #

为什么需要高可用配置  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTI2NTcz_size_16_color_FFFFFF_t_70]  
单个Nginx负载均衡整个系统，如果nginx挂了，那么整个系统都将瘫痪，这时我们就需要保证及时1个Nginx挂了，整个系统也是可用的。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTI2NTcz_size_16_color_FFFFFF_t_70 1]  
  这时我们就需要实现Nginx的高可用，nginx的高可用需要配合keepalived一起实现。

# 准备工作 #

## 1.两个nginx服务 ##

部署两个Linux节点，ip分别为 192.168.12.120和198.168.12.121，分别启动nginx  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTI2NTcz_size_16_color_FFFFFF_t_70 2]

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## 2.两个keepalived服务 ##

### 1).yum命令安装keepalived ###

yum install -y keepalived

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### 2)安装之后，在 etc 里面生成目录 keepalived，有文件 keepalived.conf ###

![在这里插入图片描述][20200619025645793.png]

## 3.完成高可用的配置 ##

修改/etc/keepalived/keepalivec.conf 配置文件

global_defs { 
    	notification_email { 
    		acassen@firewall.loc
    		failover@firewall.loc
    		sysadmin@firewall.loc
    	}
    	notification_email_from Alexandre.Cassen@firewall.loc
    		smtp_server 192.168.17.129
    		smtp_connect_timeout 30
    		router_id LVS_DEVEL
    	}
    	vrrp_script chk_http_port { 
    		script "/usr/local/src/nginx_check.sh"
    		interval 2 #（检测脚本执行的间隔）
    		weight 2
    	}
    	vrrp_instance VI_1 { 
    		state BACKUP
    		# 备份服务器上将 MASTER 改为 BACKUP
    		interface ens33 //网卡
    		virtual_router_id 51
    		# 主、备机的 virtual_router_id 必须相同
    		priority 90
    		# 主、备机取不同的优先级，主机值较大，备份机值较小
    		advert_int 1
    		authentication { 
    		auth_type PASS
    		auth_pass 1111
    	}
    	virtual_ipaddress { 
    		192.168.12.150 // VRRP H 虚拟地址
    	}
    }

在/usr/local/src 添加检测脚本

#!/bin/bash
    A=`ps -C nginx –no-header |wc -l`
    if [ $A -eq 0 ];then
    	/usr/local/nginx/sbin/nginx
    	sleep 2
    	if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
    		killall keepalived
    	fi
    fi

把两台服务器上 nginx 和 keepalived 启动  
启动 nginx：./nginx  
启动 keepalived：systemctl start keepalived.service

![在这里插入图片描述][20200619025800840.png]

## 4.最终测试 ##

在地址栏中输入 192.168.12.150:8088

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访问成功

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTI2NTcz_size_16_color_FFFFFF_t_70 6]从节点，

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTI2NTcz_size_16_color_FFFFFF_t_70 7]

将master对应的nginx和keepalived停掉

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTI2NTcz_size_16_color_FFFFFF_t_70 8]

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![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3FxXzM4NTI2NTcz_size_16_color_FFFFFF_t_70 10]

服务依然可以使用。

说明配置生效了。

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[20200619025645793.png]: https://img-blog.csdnimg.cn/20200619025645793.png
[20200619025800840.png]: https://img-blog.csdnimg.cn/20200619025800840.png
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