[root@localhost ~]# cat /etc/redhat-release
CentOS Linux release 7.2.1511 (Core)

vim /etc/yum.repos.d/nginx.repo

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/centos/$releasever/$basearch/
gpgcheck=0
enabled=1

yum install nginx

Loaded plugins: fastestmirror, langpacks
nginx                          | 2.9 kB   00:00   
nginx/7/x86_64/primary_db                 | 14 kB  00:01   
Loading mirror speeds from cached hostfile
 * base: mirrors.sina.cn
 * extras: mirrors.btte.net
 * updates: mirrors.sina.cn
Resolving Dependencies
--> Running transaction check
---> Package nginx.x86_64 1:1.10.1-1.el7.ngx will be installed
--> Finished Dependency Resolution

Dependencies Resolved

================================================================================
 Package    Arch      Version            Repository   Size
================================================================================
Installing:
 nginx     x86_64     1:1.10.1-1.el7.ngx      nginx     640 k

Transaction Summary
================================================================================
Install 1 Package

Total download size: 640 k
Installed size: 2.1 M
Is this ok [y/d/N]: y
Downloading packages:
nginx-1.10.1-1.el7.ngx.x86_64.rpm             | 640 kB  00:27   
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
 Installing : 1:nginx-1.10.1-1.el7.ngx.x86_64               1/1 
----------------------------------------------------------------------

Thanks for using nginx!

Please find the official documentation for nginx here:
* http://nginx.org/en/docs/

Commercial subscriptions for nginx are available on:
* http://nginx.com/products/

----------------------------------------------------------------------
 Verifying : 1:nginx-1.10.1-1.el7.ngx.x86_64               1/1 

Installed:
 nginx.x86_64 1:1.10.1-1.el7.ngx                        

Complete!

nginx -t

nginx: the configuration file /etc/nginx/nginx.conf syntax is ok
nginx: configuration file /etc/nginx/nginx.conf test is successful

systemctl [OPTIONS...] {COMMAND}...

systemctl stop  nginx.service
systemctl start  nginx.service
systemctl restart nginx.service

systemctl status nginx.service

systemctl enable nginx.service

systemctl disable nginx.service