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+====== Cacti ======
+===== Overview =====
+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**
+===== Cacti =====
+==== Installation ====
+Install cacti using portage:
+  * {{Package|direct=yes|net-analyzer/cacti}} {{USEFlag|{{EnableFlag|snmp}} {{EnableFlag|vhosts}}}}
+Portage only makes the webapp available on the system; in order to install it into a particular webroot, use <tt>webapp-config</tt>.
+{{Root|<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:
+{{Command|<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
+{{File|/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:
+{{Root|<source lang="bash">
+/etc/init.d/vixie-cron restart
+</source>}}
+Create an Apache vhost to serve cacti:
+{{File|/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.
+==== Configuration ====
+//todo//
+==== Proxy ====
+[[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:
+{{File|/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.
+{{Root|<source lang="bash">
+/etc/init.d/apache restart
+</source>}}
+{{Note|You must restart rather than reload apache, else it will not pick up the PROXY define and will die}}
+===== SNMP =====
+==== Installation ====
+Install the following package on all Gentoo machines to monitor:
+  * {{Package|direct=yes|net-analyzer/net-snmp}}
+==== Configuration ====
+Create an SNMPv3 user that cacti can use to access the statistics:
+{{Root|<source lang="bash">
+net-snmp-config --create-snmpv3-user -X password -a "passphrase" cacti
+</source>}}
+Create a very minimal SNMP configuration file:
+{{File|/etc/snmp/snmpd.conf|<syntax lang="conf">
+rouser cacti
+</syntax>}}
+Start snmpd, and ensure it autostarts on boot:
+{{Root|<source lang="bash">
+/etc/init.d/snmpd start
+rc-update add snmpd default
+</source>}}