How do I install and configure common options to collect SNMP data and various other data (such as system load, network link status, hard disk space, logged in users etc) into an RRD?
From the official project site:
Cacti is a complete frontend to RRDTool, it stores all of the necessary information to create graphs and populate them with data in a MySQL database. The frontend is completely PHP driven. Along with being able to maintain Graphs, Data Sources, and Round Robin Archives in a database, cacti handles the data gathering. There is also SNMP support for those used to creating traffic graphs with MRTG.Cacti is a network graphing tool which uses MRTG.
Required softwareYou need to install the following software on RHEL / Fedora / CentOS Linux:
- MySQL Server : Store cacti data.
- NET-SNMP server - SNMP (Simple Network Management Protocol) is a protocol used for network management.
- PHP with net-snmp module - Access SNMP data using PHP.
- Apache / lighttpd / ngnix webserver : Web server to display graphs created with PHP and RRDTOOL.
Install the softwareLogin as root user and type the following command to install mysql, apache and php:
# 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
Configure MySQL serverFirst, set root password:
# mysqladmin -u root password NEWPASSWORD
Create cacti MySQL databaseCreate a database called cacti, enter:
# mysql -u root -p -e 'create database cacti'
Create a user called cacti with a password called cactipass (or one of your choosing), enter:
# mysql -u root -p
mysql> GRANT ALL ON cacti.* TO cacti@localhost IDENTIFIED BY 'cactipass'; mysql> FLUSH privileges; mysql> \q
Install snmpdType the following command to install net-snmpd
# yum install net-snmp-utils php-snmp net-snmp-libs
Configure snmpd, open /etc/snmp/snmpd.conf
# vi /etc/snmp/snmpd.conf
Append / modify it as follows (see snmpd.conf man page for details):
com2sec local localhost public group MyRWGroup v1 local group MyRWGroup v2c local group MyRWGroup usm local view all included .1 80 access MyRWGroup "" any noauth exact all all none syslocation Unknown (edit /etc/snmp/snmpd.conf) syscontact Root
(configure /etc/snmp/snmp.local.conf) pass .126.96.36.199.4.1.4413.4.1 /usr/bin/ucd5820stat
Save and close the file. Turn on snmpd service:
# /etc/init.d/snmpd start
# chkconfig snmpd on
Make sure you are getting information from snmpd:
# snmpwalk -v 1 -c public localhost IP-MIB::ipAdEntIfIndex
IP-MIB::ipAdEntIfIndex.10.10.29.68 = INTEGER: 2 IP-MIB::ipAdEntIfIndex.67.yy.zz.eee = INTEGER: 3 IP-MIB::ipAdEntIfIndex.127.0.0.1 = INTEGER: 1
Install cactiFirst, make sure EPEL repo is enabled. Type the following command to install cacti:
# yum install cacti
Install cacti tablesType the following command to find out cacti.sql path:
# rpm -ql cacti | grep cacti.sql
Type the following command to install cacti tables (you need to type the cacti user password):
# mysql -u cacti -p cacti < /usr/share/doc/cacti-0.8.7d/cacti.sql
Configure cactiOpen /etc/cacti/db.php file, enter:
# vi /etc/cacti/db.php
Make the following changes:
/* make sure these values refect your actual database/host/user/password */ $database_type = "mysql"; $database_default = "cacti"; $database_hostname = "localhost"; $database_username = "cacti"; $database_password = "cactipass"; $database_port = "3306";Save and close the file.
Configure httpdOpen /etc/httpd/conf.d/cacti.conf file, enter:
# vi /etc/httpd/conf.d/cacti.conf
You need to update allow from line. Either set to ALL or your LAN subnet to allow access to cacti:
# # Cacti: An rrd based graphing tool # Alias /cacti /usr/share/cactiAnother option is create /usr/share/cacti/.htaccess file and password protect the directory. Finally, restart httpd:
Order Deny,Allow Deny from all Allow from 10.0.0.0/8
# service httpd restart
Setup cacti cronjobOpen /etc/cron.d/cacti file, enter:
# vi /etc/cron.d/cacti
Uncomment the line:
*/5 * * * * cacti /usr/bin/php /usr/share/cacti/poller.php > /dev/null 2>&1
Save and close the file.
Run cacti installerNow cacti is ready to install. Fire a webbrowser and type the url:
Just follow on screen instructions. The default username and password for cacti is admin / admin. Upon first login, you will be force to change the default password.
How do I configure SNMP data collection?SNMP can be used to monitor server traffic. Once installed login to cacti.
=> Click on Devices
=> Select Localhost
=> Make sure SNMP options are selected as follows:
Finally, click on Save button.
How do I create SNMP graphs?Click on "Create Graphs for this Host" link on top right side.
Select SNMP - Interface Statistics
Select a graph type (such as In/Out bytes with total bandwidth)
Finally, click on Create button.
How do I view graphs?To view graphs click on Graphs tab. Here is sample graph from one my own box:
(Fig.02: Cacti in action)