编译安装nginx需要pcre包，未安装会有如下提示：

./configure: error: the HTTP rewrite module requires the PCRE library.
You can either disable the module by using --without-http_rewrite_module
option, or install the PCRE library into the system, or build the PCRE library
statically from the source with nginx by using --with-pcre=<path> option.

需要安装pcre的devel包，pcre-devel。使用yum安装即可：（以下命令还带有ssl、zlib等依赖的安装）

yum -y install zlib zlib-devel openssl openssl--devel pcre pcre-devel

 关闭nginx 直接杀死进程号

[root@kaiwen ~]# ps -ef | grep nginx

root 28227 1 0 15:12 ? 00:00:00 nginx: master process ./nginx
nobody 28228 28227 0 15:12 ? 00:00:00 nginx: worker process
root 29225 16204 0 15:31 pts/0 00:00:00 grep --color=auto nginx

[root@kaiwen ~]# ps -ef | grep nginx

[root@kaiwen ~]# kill -quit 28227
[root@kaiwen ~]# ps -ef | grep nginx
root 29546 16204 0 15:38 pts/0 00:00:00 grep --color=auto nginx