Error Code :
[Tue Feb 22 00:35:50 2014] [error] [client 71.134.23.164] /usr/bin/php:
/usr/lib64/libmysqlclient.so.15: version `libmysqlclient_15′ not found
(required by /usr/bin/php)
[Tue Feb 22 00:35:50 2014] [error] [client 71.134.23.164] Premature end
of script headers: index.php
[Tue Feb 22 00:35:52 2014] [error] [client 67.195.112.231] /usr/bin/php:
/usr/lib64/libmysqlclient.so.15: version `libmysqlclient_15′ not found
(required by /usr/bin/php)
[Tue Feb 22 00:35:52 2014] [error] [client 67.195.112.231] Premature end
of script headers: index.php
[Tue Feb 22 00:35:52 2014] [error] [client 67.195.112.231] /usr/bin/php:
/usr/lib64/libmysqlclient.so.15: version `libmysqlclient_15′ not found
(required by /usr/bin/php)
[Tue Feb 22 00:35:52 2014] [error] [client 67.195.112.231] Premature end
of script headers: index.php
[Tue Feb 22 00:35:56 2014] [error] [client 207.46.13.93] /usr/bin/php:
/usr/lib64/libmysqlclient.so.15: version `libmysqlclient_15′ not found
(required by /usr/bin/php)
[Tue Feb 22 00:35:56 2014] [error] [client 207.46.13.93] Premature end
Fix
root@se4rver01[~]#vi /var/cPanel/cpanel.config
go to mysql-version and replace 4.1 to 5.1 or whatever version you like to upgrade
root@se4rver01[~]#/usr/local/cpanel/whostmgr/bin/whostmgr2 –updatetweaksettings
root@se4rver01[~]#/scripts/mysqlup
after this you are done.