./apachectl start
httpd: Syntax error on line 54 of /home/liansm/tool/apache2/conf/httpd.conf: Cannot load /home/liansm/tool/apache2/modules/libphp5.so into server: /home/liansm/tool/apache2/modules/libphp5.so: cannot restore segment prot after reloc: Permission denied
解决方法
chcon -t textrel_shlib_t libphp5.so
selinux引起的问题