启动nginx，报错：error while loading shared libraries: libpcre.so.1:

$./nginx 或者 /usr/local/nginx/sbin/nginx 来启动nginx，会报如下错：
./nginx: error while loading shared libraries: libpcre.so.1: cannot open shared object file: No such file or directory
下面一步步解析：
If you are getting above error while starting nginx, you can fix by following.

This generally happens due to following three reasons.

You don’t have PCRE installed
Nginx was not complied & installed using pcre
PCRE library is not set in LD_LIBRARY_PATH

There are multiple ways to fix this issue. The best way I believe is using troubleshooting skills. Let’s understand the error and fix it accordingly.
nginx: error while loading shared libraries: libpcre.so.1
nginx is looking for file libpcre.so.1 which comes under PCRE library and usually installed on UNIX.

Let’s find libpcre.so.1 using find command

$find / -name libpcre.so.1
/usr/local/lib/libpcre.so.1
$

Ok, so I do have this file which means PCRE is already installed and will proceed with next troubleshooting step.
Note: If you don’t get find results then you got to install PCRE. You can either install using yum install pcre on Linux/CentOS or can ask system administrator to install
it.

Now, let’s set LD_LIBRARY_PATH as we could see libpcre.so.1 is available under /usr/local/lib

$export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH

Start nginx now, you should be able to start.

[root@localhost lib]# /usr/local/nginx/sbin/nginx

[root@localhost lib]# ps -ef |grep nginxroot      9539     1  0 19:06 ?        00:00:00 nginx: master process /usr/local/nginx/sbin/nginxwww       9540  9539  0 19:06 ?        00:00:00 nginx: worker process

OK，nginx 已经启动了。

---注：不过，我需要先切到root下，再去执行

export LD_LIBRARY_PATH=/usr/local/lib:$LD_LIBRARY_PATH       和/usr/local/nginx/sbin/nginx   才行。否则，会没有权限。

转：http://chandank.com/webservers/nginx/nginx-error-while-loading-shared-libraries-libpcre-so-1