Centos7 Nginx安装步骤及常见问题汇总，亲测有效！

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1、安装Nginx

>  sudo yum install nginx

• 如果没有安装源，按照版本执行源添加

//centos6
rpm -ivh http://nginx.org/packages/centos/6/noarch/RPMS/nginx-release-centos-6-0.el6.ngx.noarch.rpm
//centos7
rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/nginx-release-centos-7-0.el7.ngx.noarch.rpm

2、设置开机启动服务

> sudo systemctl enable nginx

3、启动/停止/重启Nginx服务

• 启动

> sudo systemctl start nginx

• 停止

> sudo systemctl stop nginx

• 重启

> sudo systemctl restart nginx

4、查看运行状态

> sudo systemctl status nginx

5、测试访问

>  curl 127.0.0.1

  
  







    

        
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• 就此完成安装

6、前后端分离配置

7、常见错误

• # (13: Permission denied) while connecting to upstream

2019/11/06 10:53:49 [error] 79727#0: *2 open() "/home/xnzf/www/index.html" failed (13: Permission denied), client: 202.0.82.97, server: , request: "GET /index.html HTTP/1.1", host: "202.0.81.70:7010"

2019/11/06 10:53:07 [error] 79455#0: *1 open() "/home/xnzf/www/index.html" failed (13: Permission denied), client: 202.0.82.97, server: , request: "GET /index.html HTTP/1.1", host: "202.0.81.70:7010"

原因及解决方案：问题是由SElinux导致，查看audit日志：

> sudo cat /var/log/audit/audit.log | grep nginx | grep denied

错误信息：

type=AVC msg=audit(1573009833.405:27595): avc: denied { name_connect } for pid=83616 comm="nginx" dest=8011 scontext=system_u:system_r:httpd_t:s0 tcontext=system_u:object_r:unreserved_port_t:s0 tclass=tcp_socket

修复此错误：

sudo cat /var/log/audit/audit.log | grep nginx | grep denied | audit2allow -M mynginx
******************** IMPORTANT ***********************
To make this policy package active, execute:

semodule -i mynginx.pp

执行修复

sudo semodule -i mynginx.pp

问题最终得到解决。

• 安装nginx提示

[xnzf@localhost ~]$ sudo yum install nginx
已加载插件：fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.163.com
 * extras: mirrors.cn99.com
 * updates: mirrors.163.com
没有可用软件包 nginx。
错误：无须任何处理

解决办法：阿里yum源加速
安装base reop源
备份旧源

cd /etc/yum.repos.d
sudo mv CentOS-Base.repo CentOS-Base.repo.bak

修改为阿里源

sudo wget -O CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

安装epel repo源
epel(RHEL 7)

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

epel(RHEL 6)

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo

epel(RHEL 5)

wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-5.repo

或

• 配置 EPEL源

sudo yum install -y epel-release
sudo yum -y update

• 安装Nginx

sudo yum install -y nginx

刷新缓存

yum clean all
yum makecache

• nginx 代理转发时，此页面不能正确地重定向，连接到 www.website.com 时发生错误。

        location / {
          proxy_pass         http://app.website.com/;
          proxy_set_header   Host            $host;
          proxy_set_header   Remote_Addr     $remote_addr;
          proxy_set_header   X-Real-IP       $remote_addr;
          proxy_set_header   X-Forwarded-For $proxy_add_x_forwarded_for;
        }

去除proxy就可以了

        location / {
          proxy_pass         http://app.website.com/;
        }