环境：centos7、nginx
1.下载nginx最新版本，www.nginx.org
本文使用当前的最新版本：http://nginx.org/download/nginx-1.11.4.tar.gz
2.nginx安装前置操作
nginx使用make方式安装，安装之前有几个前置操作
yum install gcc
yum -y install pcre-devel
yum install -y zlib-devel
其他环境如果安装上面三个组件不行，根据./configure提示安装即可
3.nginx编译和安装
./configure
make
make install
4.找到安装的nginx文件
whereis nginx
nginx: /usr/local/nginx
nginx编译以后，把nginx生成到了/usr/local/nginx目录下，该目录下/usr/local/nginx/sbin/nginx为可执行文件
5.nginx服务器操作
cd /usr/local/nginx/sbin
启动：./nginx
停止：./nginx -s stop
重启：./nginx -s reopen
6.nginx其他操作
输入命令：./nginx -h
查看帮助：
nginx version: nginx/1.11.4
Usage: nginx [-?hvVtTq] [-s signal] [-c filename] [-p prefix] [-g directives]
Options:
-?,-h : this help
-v : show version and exit
-V : show version and configure options then exit
-t : test configuration and exit
-T : test configuration, dump it and exit
-q : suppress non-error messages during configuration testing
-s signal : send signal to a master process: stop, quit, reopen, reload
-p prefix : set prefix path (default: /usr/local/nginx/)
-c filename : set configuration file (default: conf/nginx.conf)
-g directives : set global directives out of configuration file
7.验证安装成功
执行命令：curl http://localhost
如果出现下面内容则安装成功：
<!DOCTYPE html>
<html>
<head>
<title>Welcome to nginx!</title>
<style>
body {
35em;
margin: 0 auto;
font-family: Tahoma, Verdana, Arial, sans-serif;
}
</style>
</head>
<body>
<h1>Welcome to nginx!</h1>
<p>If you see this page, the nginx web server is successfully installed and
working. Further configuration is required.</p>
<p>For online documentation and support please refer to
<a href="http://nginx.org/">nginx.org</a>.<br/>
Commercial support is available at
<a href="http://nginx.com/">nginx.com</a>.</p>
<p><em>Thank you for using nginx.</em></p>
</body>
</html>