Nagios图形显示pnp4nagios访问出错解决
问题描述：安装pnp4nagios后访问图形提示“Object not found”页面
软件版本：
suse linux sles 10sp2 x86_64
nagios 3.2.0
pnp4nagios-0.6.2
apache2 2.2.3
问题解决：
step1，直接访问http://<ipaddress>/pnp4nagios/，pnp4nagios给出一个测试结果界面，提示“Apache mod_rewrite is not enabled”，怀疑是apache2的rewrite module没有启用；
step2，查看apache2的loadmodule配置
# vi /etc/sysconfig/apache2
在APACHE_MODULES加入rewrite选项
APACHE_MODULES="apparmor actions alias auth_basic authn_file authz_host authz_groupfile authz_default authz_user authn_dbm autoindex cgi dir env expires include log_config mime negotiation setenvif ssl suexec userdir php5 rewrite"
step3，重启apache2
service apache2 restart
查看/etc/apache2/sysconfig.d/loadmodule.conf发现rewrite_module已经加入
LoadModule rewrite_module /usr/lib64/apache2-prefork/mod_rewrite.so
step4，再次访问http://<ipaddress>/pnp4nagios/
Apache Rewrite Module Pass
step5，修改pnp4nagios下install.php文件名
mv /usr/local/pnp4nagios/share/install.php /usr/local/pnp4nagios/share/install.php.bk
step6，再次访问图像界面，又提示
pnp error
An error was detected which prevented the loading of this page. If this problem persists, please contact the website administrator.
/usr/local/pnp4nagios/lib/kohana/system/libraries/Session.php :
session_start(): open(/var/lib/php5/sess_d1suf0cpph46v95efp1b7l0cbtt0q7nr, O_RDWR) failed: Permission denied (13)
step7，检查 /var/lib/php5 目录的权限，发现原来是root才可以读写，而apache2采用了nagios的用户来运行，所以php的session数据没有权限写入，于是更改/var/lib/php5的写入权限
chown -R 777 /var/lib/php5
修改后pnp4nagios图形终于访问正常。
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