https://aalvrz.me/tags/ssh/ Recent content in ssh on Andrés Álvarez Hugo -- gohugo.io en-us Wed, 14 Dec 2016 00:00:00 +0000 https://aalvrz.me/posts/ssh-monitoring-in-zenpacks/ Wed, 14 Dec 2016 00:00:00 +0000 https://aalvrz.me/posts/ssh-monitoring-in-zenpacks/ <p>Zenoss usually monitors and collects information using <strong>SNMP</strong> and <strong>SSH</strong> methods. A good example of is the <a href="http://wiki.zenoss.org/ZenPack:Linux_Monitor">linux monitor ZenPack</a> which can collect information such as hard disks, interfaces, and file systems using <strong>both</strong> methods.</p> <p>SNMP works by installing and configuring an SNMP agent on the machine we want to monitor. This agent will poll the machine for data, and this data can be retrieved by Zenoss using <strong><a href="http://www.net-snmp.org/">net-snmp</a></strong>.</p> <p>On the other hand, SSH works by configuring a username and password or a path to an SSH key zProperties. This will allow Zenoss to remotely access the host using SSH and execute the corresponding commands and return the corresponding information.</p> <p>When developing ZenPacks, data collection using SNMP is a relatively common practice. There is even a very good tutorial on <a href="https://zenpacklib.zenoss.com/en/latest/tutorial-snmp-device/index.html">SNMP monitoring using zenpacklib</a>. When using SNMP, the modeler plugins are <code>SnmpPlugin</code> plugins that typically work using a set of <a href="http://www.dpstele.com/snmp/what-does-oid-network-elements.php">OIDs</a> to determine exactly which data is to be modeled.</p> <h2 id="ssh-in-modeler-plugins">SSH in Modeler Plugins</h2> <p>In order to make a modeler plugin utilize SSH as it's polling method we need to use a different type of plugin, the <code>CommandPlugin</code> plugin. The structure of this type of plugin is very similar to the <code>SnmpPlugin</code>, however there is one critical variable that must be implemented.</p>