The purpose of this article is to describe how op5 Monitor can be used with the check_libvirt plugin for agentless monitoring of resource usage on a KVM installation. At the moment the plugin can monitor:

Host Parameters:

• Storage pool list
• Storage pool volume usage
• Running VM’s

VM Parameters:

• CPU Usage
• Memory Usage
• Disk I/O
• Network I/O

Prerequisites

• Libvirt drivers need to be installed on both the op5 Monitor server and on the target KVM host(s).
• The plugin support several transport protocols. In this guideline we will explain how to use the SSH and TLS features.
  • If you want use SSH, you need to setup a key-based authentication for the monitor user on the op5 monitor server and the root user on the target KVM host (libvirt is usually running as root).
  • If you want use TLS  as communication protocol then you will need to generate client and server certificates. Please follow the libvirt.org how-to for that. Be careful and follow all the steps in that how-to before you continue. Notice that the KVM host server is the server and the op5 Monitor server is the client for the TLS communication.
• All servers can be resolved in the DNS.
• Update op5 Monitor to get the latest plugin pack.

Check commands

SSH as transport protocol

If you use SSH, import the required check-commands in your configuration (‘Configure’ -> ‘Check Command Import -> check_libvirt_kvm*’). After the import you will have the following check commands:

Commands for guest VM’s

Commands for the VMs

Commands for KVM host server

Note: $ARG1$ macro in the command_line refer to the user you will use to connect to the KVM host server, in these case root, the $HOSTADDRESS$ refer to the KVM host and the $ARG2$ refer to the guest VM-name.

TLS as transport protocol

If you prefer user TLS, then you can add yourself the above check command to your configuration, you need only replace qemu+ssh with qemu+tls, (‘Configure’ -> ‘Commands’ -> ‘Add new command’ -> ‘Go’).

Adding the services

Some services example following.

Add the required services as your needs, (‘Configure’ -> ‘Host: ‘ -> ‘Go’ -> ‘Services for host ‘ -> ‘Add new service’ -> ‘Go’):

Arguments are just examples, you need to adjust them to suite your environment.

Services for guest VM

Services for KVM host server

* Note: No warning or critical arguments are used in these examples. The plugin does however support thresholds.

This plugin and these check_command has been successfully tested on CentOS/RHEL v.5.5 and 6.x with KVM 2.x.

More information about libvirt can be found at: www.libvirt.org

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