Nginx具体配置(三)

2023-11-03

一：Nginx配置实例 - 反向代理
　实例一：
　　1.1：实现效果

在Windows浏览器地址栏中输入www.123.com，跳转到Linux系统中的tomcat主页面

访问Nginx：192.168.92.130:80

访问Tomcat：192.168.92.130:8080

1.2：访问过程分析

1.3：具体配置

1.3.1：在windows的host文件中配置域名和IP对应关系的配置，在host文件中添加内容：IP地址和内容

这时在浏览器输入www.123.com:8080即可访问到Tomcat页面

1.3.2：在Nginx进行请求转发的配置（反向代理配置）

vi nginx.conf修改文件

实例二：
　　　　2.1：实现效果

使用Nginx反向代理，根据访问的路径跳转到不同端口的服务中心

访问http://192.168.92.130:9001/edu/ 直接跳转到127.0.0.1:8080

访问http://192.168.92.130:9001/vod/ 直接跳转到127.0.0.1:8081

2.2：准备两个Tomcat，一个8080端口，一个8081端口

在tomcat8080中进入到webapps文件下，创建edu文件，创建a.html（内容8080）

在tomcat8081中进入到webapps文件下，创建vod文件，创建a.html（内容8081）

2.3：具体配置

在请求路径中包含edu的访问8080端口，请求路径中包含vod的访问8081端口

测试访问成功！

二：Nginx配置实例 - 负载均衡
　　　2.1：实现效果

在浏览器中输入地址http://192.168.92.130/edu/a.html，平均分配到8080和8081端口中

在两台tomcat中webapps文件中，创建edu文件夹，在edu文件夹中创建a.html页面

2.2:具体配置

2.3：负载均衡的分配策略

1：轮询（默认）

每个请求根据时间顺序逐一分配带不同的服务器，如果服务器down掉，会自动剔除

2：weight

weight代表权重，默认为1，权重越高被分配的客户端越多

3：ip_hash

每个请求按访问ip的hash结果分配；这样能固定访问访问同一个服务器，可以解决session的问题

4：fair（第三方）

按后端服务器的响应时间来分配请求，响应时间越短的优先分配

三：Nginx配置实例 - 动静分离
　　　　1：动静分离简单来说就是把静态请求和动态请求分开，不能理解成只是单纯的静态页面和动态页面分开，

可以理解成使用Nginx处理静态请求，Tomcat处理动态请求。目前动静分离实现方式有两种：

1.1：纯粹把静态文件独立成单独的域名，放在独立的服务器上，也是目前主流推崇的方案

1.2：动态和静态文件混合发布，通过Nginx分开

2：准备工作

创建data文件，在data文件中创建www文件和img文件，在www文件中加入a.html，在img文件中加入一张图片

data/www/a.html data/img/3.png

3：Nginx具体配置

四：Nginx配置高可用集群

1：准备两台服务器，分别安装nginx，keepalived

  　　   安装keepalived命令：yum install keepalived -y

            查看是否安装成功命令：rpm -q -a keepalived

            安装路径：/etc/keepalived/keepalived.conf

2：主从配置

2.1：修改keepalived的配置文件keepalived.conf

复制代码
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 # LVS_DEVEL这字段在/etc/hosts文件中看；通过它访问到主机
}

vrrp_script chk_http_ port {
script “/usr/local/src/nginx_check.sh”
interval 2 # (检测脚本执行的间隔)2s
weight 2 #权重，如果这个脚本检测为真，服务器权重+2
}

vrrp_instance VI_1 {
state BACKUP # 备份服务器上将MASTER 改为BACKUP
interface ens33 //网卡名称
virtual_router_id 51 # 主、备机的virtual_router_id必须相同
priority 100 #主、备机取不同的优先级，主机值较大，备份机值较小
advert_int 1 #每隔1s发送一次心跳
authentication { # 校验方式，类型是密码，密码1111
auth type PASS
auth pass 1111
}
virtual_ipaddress { # 虛拟ip
192.168.17.50 // VRRP H虛拟ip地址
}
}
复制代码

2.2：在路径/usr/local/src/ 下新建检测脚本 nginx_check.sh

复制代码
#! /bin/bash
A=ps -C nginx -no-header | wc - 1
if [ $A -eq 0];then
/usr/local/nginx/sbin/nginx
sleep 2
if [ps -C nginx --no-header| wc -1 -eq 0 ];then
killall keepalived
fi
fi
复制代码

3：两台服务器启动Nginx和keepalived

systemctl start keepalived.service　　 #启动keepalived
　　 ps -ef I grep keepalived 　　#查看keepalived是否启动

systemctl stop keepalived.service 　　#停止keepalived

4：测试

在浏览器地址栏输入虚拟ip地址192.168.50.20

把主服务器(192.168.92.130) nginx和keealived停止，再输入192.168.50.20

五：Nginx工作原理
　　　1：master & worker
　　　　master相当于管理者，worker可以有多个，当请求进来后，master告诉worker，worker进行处理

2：worker如何进行工作（争抢机制）

3：一个master和多个worker的好处

3.1：可以使用 nginx -s reload 热部署，利用nginx进行热部署操作

3.2：每个worker都是独立的进程，不需要加锁，如果其中一个worker出现问题，并不会影响到其他的

4：需要设置多少个worker

Nginx和Redis类似，都采用了IO多路复用机制，每个worker都是一个独立的进程，但每个进程只有一个主线程，

通过异步非阻塞的方式来处理请求，worker数和服务器的cpu数相等最为适宜，如下：

# 设置worker数量
　　　 worker.processes 4;

# 也可以把值设置为auto，nginx会自动检测当前主机的cpu核心数,并启动对应数量的worker进程

worker.processes auto;

        # work绑定cpu(4work绑定4cpu)
        worker_cpu_affinity 0001 0010 0100 1000

       # work绑定cpu (4work绑定8cpu中的4个)
       worker_cpu_affinity 0000001 00000010 00000100 00001000

5：连接数：worker_connection

这个值是表示每个worker进程所能建立连接的最大值，所以，一个nginx 能建立的最大连接数，

应该是worker_connections * worker_processes。当然，这里说的是最大连接数，对于HTTP

请求本地资源来说，能够支持的最大并发数量是worker_connections * worker_processes,

如果是支持http1.1的浏览器每次访问要占两个连接，

所以普通的静态访问最大并发数是: worker_connections * worker_processes / 2

而如果是HTTP作为反向代理来说，最大并发数量应该是worker_connections * worker_proceses/4.

因为作为反向代理服务器，每个并发会建立与客户端的连接和与后端服务的连接，会占用两个连接.

5.1：发送一个请求，占用了worker的几个连接数

2个或4个

5.2：nginx有一个master，四个worker，每个worker支持最大的连接数是1024，支持的最大并发数是多少

worker_connections * worker_processes / 2

worker_connections * worker_proceses/4.

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https://blog.csdn.net/weixin_47220020/article/details/106648683
https://blog.csdn.net/weixin_47220020/article/details/106648705
https://blog.csdn.net/kldsifbwasfsa0/article/details/106648741
https://blog.csdn.net/kldsifbwasfsa0/article/details/106648842

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