The shared library libpcre cannot be found when apache2 is started.

After Apache is installed, the system prompts that libpcre. so.1 cannot be found at startup:

 
/Usr/local/apache2/bin/httpd: ErrorWhileLoading shared libraries: libpcre. So.1: Cannot open sharedObject File: No suchFileOr directory
 

 

Use LDD to view httpd dependent database information:

 # LDD httpdlinux -Vdso. So. 1 => ( 0x00007fff691ff000  ) Libpcre. So.  1 => Not foundlibaprutil - 1 . So.0 =>/Usr/local/apache2/lib/libaprutil- 1 . So. 0 ( 0x00007ff847f31000  ) Libapr - 1 . So. 0 =>/Usr/local/apache2/lib/libapr- 1 . So. 0 ( 0x00007ff847d00000  ) Libpthread. So.  0 = & Gt;/lib/x86_64-linux-gnu/libpthread. So.0 ( 0x00007ff847ae3000  ) Libc. So.  6 /Lib/x86_64-linux-gnu/libc. So. 6 ( 0x00007ff8470000000  ) Libexpat. So.  0 =>/Usr/local/apache2/lib/libexpat. So. 0 ( 0x00007ff8474fb000  ) Libcrypt. So.  1 /Lib/x86_64-linux-gnu/libcrypt. So. 1 (0x00007ff8472c2000  ) Libdl. So.  2 = & Gt;/lib/x86_64-linux-gnu/libdl. So. 2 ( 0x00007ff8470be000  ) /Lib64/ LD -Linux-x86- 64 . So. 2 ( 0x00007ff848165000 )

The libpcre. so.1 library is not found.

 

Solution:

1. Search for the libpcre. so.1 file and find it in the/usr/local/lib directory.

2. Create the file libc. conf in the/etc/lD. So. conf. d directory and add the/usr/local/lib directory to the file:

/Usr/local/lib
 

3. Run the ldconfig command:

 
SudoLdconfig
 

4. Run the LDD command to check whether libpcre. so.1 has been found:

 # LDD httpdlinux -Vdso. So. 1 => ( 0x00007fffcc3ff000  ) Libpcre. So.  1 =>/Usr/local/lib/libpcre. So. 1 ( 0x00007f2f68f98000  ) Libaprutil - 1 . So. 0 =>/Usr/local/apache2/lib/libaprutil-1 . So. 0 ( 0x00007f2f68d76000  ) Libapr - 1 . So. 0 =>/Usr/local/apache2/lib/libapr- 1 . So. 0 ( 0x00007f2f68b45000  ) Libpthread. So.  0 = & Gt;/lib/x86_64-linux-gnu/libpthread. So. 0 ( 0x00007f2f68928000 ) Libc. So.  6 /Lib/x86_64-linux-gnu/libc. So. 6 ( 0x00007f2f6856b000  ) Libexpat. So.  0 =>/Usr/local/apache2/lib/libexpat. So. 0 ( 0x00007f2f68340000  ) Libcrypt. So.  1 /Lib/x86_64-linux-gnu/libcrypt. So. 1 ( 0x00007f2f680000000  ) Libdl. So. 2 = & Gt;/lib/x86_64-linux-gnu/libdl. So. 2 ( 0x00007f2f67f03000  ) /Lib64/ LD -Linux-x86- 64 . So. 2 ( 0x00007f2f691c7000 )