错误安装之后没有图像，进入rra目录发现根本没有生成rra文件，而且rra目录的权限是正确的。

那么php poller.php根本就没有生效，google了以下，老外建议使用debug查看原因

/usr/local/php5/bin/php -q /usr/share/cacti/poller.php --force --debug

我这里的报错是

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/dbase.so' - /etc/php.d/dbase.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/mysql.so' - /etc/php.d/mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/mysqli.so' - /etc/php.d/mysqli.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/pdo.so' - /etc/php.d/pdo.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/pdo_mysql.so' - /etc/php.d/pdo_mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/pdo_sqlite.so' - /etc/php.d/pdo_sqlite.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/snmp.so' - /etc/php.d/snmp.so: cannot open shared object file: No such file or directory in Unknown on line 0

08/10/2011 03:56:30 PM - POLLER: Poller[0] DEBUG: About to Spawn a Remote Process [CMD: /usr/bin/php, ARGS: -q "/usr/share/cacti/cmd.php" 1 1]

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/dbase.so' - /etc/php.d/dbase.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/mysql.so' - /etc/php.d/mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/mysqli.so' - /etc/php.d/mysqli.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/pdo.so' - /etc/php.d/pdo.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/pdo_mysql.so' - /etc/php.d/pdo_mysql.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/pdo_sqlite.so' - /etc/php.d/pdo_sqlite.so: cannot open shared object file: No such file or directory in Unknown on line 0

PHP Warning:  PHP Startup: Unable to load dynamic library '/etc/php.d/snmp.so' - /etc/php.d/snmp.so: cannot open shared object file: No such file or directory in Unknown on line 0

证明php的so文件没有加载成功。我将/usr/lib64/php/modules下的文件全部拷贝到了/etc/php.d下就可以使用了