Cacti Notes Revision as of Sunday, 20 December 2015 at 19:56 UTC

Pre-Flight

I’m using CentOS-Testing to install PHP 5.2.10.

 yum install mysql-server mysql php-mysql php-pear php-common php-gd php-devel php php-mbstring php-cli php-snmp php-pear-Net-SMTP php-mysql httpd net-snmp-utils php-snmp net-snmp-libs rrdtool --enablerepo=c5-testing

Here’s what I have in /etc/snmp/snmp/conf:

 rocommunity HOME
 syslocation "The University of Iowa"
 syscontact mail@nikhil.io

I also made sure that the SNMP daemon was running by running:

 snmpwalk -v 1 -c CLCG localhost IP-MIB::ipAdEntIfIndex

Set up the MySQL database:

 grant all on cacti.* to 'cactiuser'@'localhost' identified by 'Lua77hQhdnB';

Install Cacti

Make sure that the EPEL
repository
is installed.

 yum -y install cacti --enablerepo=epel

Look for an SQL install file and install it:

 rpm -ql cacti | grep cacti.sql
 /usr/share/doc/cacti-0.8.7f/cacti.sql
 mysql -ucactiuser -p cacti < /usr/share/doc/cacti-0.8.7f/cacti.sql

Now edit the config file (/etc/cacti/db.php) to add database
information.

• The Cacti RPM also installs a configuration directive,
  /etc/httpd/conf.d/cacti.conf. Change it to Allow from all
• You’ll also find stuff in /etc/cron.d/cacti. Add that to
  your crontab.
• The installer should create a cacti user and cacti group.

Change some permissions:

 chmod -R 755 /usr/share/cacti
 chown -R cacti:cacti /usr/share/cacti

Make sure that the rra/ and log/ are owned by cacti.

Now restart the httpd service and navigate to
http://site/'''cacti''' (or whatever you edited to be the Alias
directive.) The username/password config for the first time login is
admin/admin.

Problems

• The most important thing: The poller must run as the cacti
  user!

You get a “Forbidden” when loading the page for the first time

• Make sure that you have Allow from all in
  /etc/httpd/conf.d/cacti.conf
• Make sure that the user:group permissions are good for
  /usr/share/cacti

No freakin’ graphs

Tailing the httpd error log produces something like:

 ERROR: opening '/usr/share/cacti/rra/localhost_mem_buffers_3.rrd': No such file or directory

There’s also nothing in /var/log/cacti/cacti.log. In this case, do
this:

 chown cacti:apache /var/lib/cacti/rra
 chmod 775 cacti:apache /var/lib/cacti/rra

This is a bug that
others have encountered. I changed the permissions like above, ran the
poller and the graphs were displayed. I’m fine with this.

Category:Installation Logs
Category:Nikhil’s Notes