Cacti

Cacti is hosted on Silverhold and can be found at http://cacti.sihnon.net/.

You can view the graphs as a guest, by logging in with the following credentials:

• Username: guest
• Password: view
• Realm: Local

Install cacti using portage:

• direct=yes|net-analyzer/cacti {{EnableFlag|snmp vhosts}}

Portage only makes the webapp available on the system; in order to install it into a particular webroot, use <tt>webapp-config</tt>. <source lang="bash"> webapp-config -I -V -h cacti.sihnon.net cacti 0.8.7d </source>

• Create a <tt>cacti</tt> user on <tt>mysql.sihnon.net</tt>, and grant privileges on all cacti_ databases (use [https://dev.sihnon.net/pma phpMyAdmin to do this).
• Create a <tt>cacti_db</tt> database
• Install the database schema by running the following command on the web host:

<source lang="bash"> mysql -u cacti -p cactipass -h mysql.sihnon.net cacti_db < /var/www/cacti.sihnon.net/html/cacti.sql </source> *Edit the database configuration file with the correct settings (<tt>/var/www/cacti.sihnon.net/html/include/config.php</tt>)

Install a cronjob to update the data queries /etc/cron.d/cacti|<syntax lang="cron"> */5 * * * * apache /usr/bin/php /var/www/cacti.sihnon.net/html/poller.php > /dev/null 2>&1 </syntax>

Restart <tt>vixie-cron</tt> to pick up the new cronjob: <source lang="bash"> /etc/init.d/vixie-cron restart </source>

Create an Apache vhost to serve cacti: /etc/apache2/vhosts.d/01_cacti.sihnon.net.conf|<syntax lang="apache"> <VirtualHost *:80> ServerName "cacti.sihnon.net" DocumentRoot "/var/www/cacti.sihnon.net/html" <Directory "/var/www/cacti.sihnon.net/html"> Options FollowSymLinks AllowOverride All Order allow,deny Allow from all </Directory> </VirtualHost> - vim: set filetype=apache: </syntax>

Open the web interface in a browser, and follow the initial setup. The initial credentials are advertised by webapp-config.

todo

Silverhold doesn't have a publicly accessible IP, so cacti needs to be proxied through a machine that does.

Enable <tt>mod_proxy</tt> on a suitable machine by adding <tt>APACHE_OPTS=“-D PROXY”</tt> to <tt>/etc/conf.d/apache2</tt>.

Then create the following vhost: /etc/apache2/vhosts/07_cacti.sihnon.net.conf|<syntax lang="apache"> <VirtualHost *:80> ServerName cacti.sihnon.net ProxyRequests Off <Proxy *> Order deny,allow Allow from all </Proxy> ProxyPass / http://cacti.sihnon.net/ ProxyPassReverse / http://cacti.sihnon.net/ </VirtualHost> - vim: set ts=4 expandtab filetype=apache: </syntax>

Arrange for DNS to resolve internally to the cacti host, and externally to the proxy host.

Finally, restart apache to pick up the new vhost. <source lang="bash"> /etc/init.d/apache restart </source> You must restart rather than reload apache, else it will not pick up the PROXY define and will die

Install the following package on all Gentoo machines to monitor:

• direct=yes|net-analyzer/net-snmp

Create an SNMPv3 user that cacti can use to access the statistics: <source lang="bash"> net-snmp-config --create-snmpv3-user -X password -a "passphrase" cacti </source>

Create a very minimal SNMP configuration file: /etc/snmp/snmpd.conf|<syntax lang="conf"> rouser cacti </syntax>

Start snmpd, and ensure it autostarts on boot: <source lang="bash"> /etc/init.d/snmpd start rc-update add snmpd default </source>