【プログラム実行時にライブラリファイルが見つからない】nginx:error while loading shared libraries:libpcre.so.1

【プログラム実行時にライブラリファイルが見つからない】
19 Oct 2013 
Written by  Chandan Kumar 

Published in Nginx 
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【解決策:1.必要なライブラリが存在するかどうかを探します:usr/local/libを探します
2.このライブラリが存在する場合はLD_を設定するLIBRARY_PATH=/usr/local/lib:この環境変数は、ライブラリのパスを追加します
3.プログラムを再コンパイラして実行してみます.
原理:
システムによるダイナミックライブラリの検索ルール:/lib/usr/libから環境変数LD_LIBRARY_PATHで指定されたパスの中で/etc/profileの下にパス環境変数が表示されます.各ディレクトリ用:windowディレクトリ分割用;【1.ファイル/etc/profileで2.export LD_LIBRARY_PATH=::~(現在のユーザーホーム):.:~soft 01(soft 01ユーザーホーム)]]
】
$./nginx
./nginx: error while loading shared libraries: libpcre.so.1: cannot open shared object file: No such file or directory
$
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.