ZenPacks.community.UserGroup

Description

This ZenPack monitors Operating System users and user groups. It is almost entirely created with zenpacklib (Version 1.0.11). It uses a COMMAND modeler and a COMMAND template.

In addition to standard zenpack.yaml definition of Zenoss device classes and device and component object classes, along with templates, it also demonstrates using custom icons and the use of creating and calling methods for a component object.

zenpacklib usage

This ZenPack is built with the zenpacklib library so does not have explicit code definitions for device classes, device and component objects or zProperties; however a User.py file does exist to provide a method to derive secondary user groups for a user.

Templates are also created through zenpacklib. These elements are all created through the zenpack.yaml file in the main directory of the ZenPack. See http://zenpacklib.zenoss.com/en/latest/index.html for more information on zenpacklib.

Note that if templates are changed in the zenpack.yaml file then when the ZenPack is reinstalled, the existing templates will be renamed in the Zenoss ZODB database and the new template from the YAML file will be installed; thus a backup is effectively taken. Old templates should be deleted in the Zenoss GUI when the new version is proven.

Features

Zenoss Device Classes

zenpacklib creates /Server/Linux/UserGroup with:

• zPythonClass: ZenPacks.community.UserGroup.UserGroupDevice
• zDeviceTemplates:
  • DnsMonitor
  • Device
• zSshConcurrentSessions: 5
• zCollectorPlugins: ['zenoss.snmp.NewDeviceMap', 'zenoss.snmp.DeviceMap', 'zenoss.snmp.InterfaceMap', 'zenoss.snmp.RouteMap', 'zenoss.snmp.IpServiceMap', 'zenoss.snmp.HRFileSystemMap', 'zenoss.snmp.HRSWRunMap', 'zenoss.snmp.CpuMap', 'zenoss.snmp.SnmpV3EngineIdMap', 'cmd.UserGroupMap']
• The User component template is created, available to this class

Device and component object classes

• UserGroupDevice - it has no new attributes
  • uses an icon defined by four-tux-56x56.png, shipped in the resources/icon subdirectory of the ZenPack.
• UserGroup component class with attributes:
  • groupName
  • GID
  • secondaryUsers
  • hasSecondaries
  • monitoring_templates set to [UserGroup]
• User component class with attributes:
  • userName
  • UID
  • primaryGID
  • primaryGroupName
  • getSecGroups (this demonstrates an object method property)
  • userComment
  • homeDir
  • commandShell
  • monitoring_templates set to [User]

Relationships are:

• UserGroupDevice -> contains many UserGroup components -> contains many User components

Properties

zenpacklib creates a zProperty, zMinUID used to limit the number of users discovered to those with a UID greater than or equal to zMinUID.

Modeler Plugins

There is no device-level modeler.

• UserGroupMap in modeler/plugins/cmd, a COMMAND modeler which populates:
  • UserGroups
  • Users with the UserGroup as their primary GID

Monitoring Templates

• Device templates
  • no device templates are shipped
• Component templates
  • User with a single COMMAND datasource to gather the number of groups for a given user.

Datasources

None.

Events

None.

GUI modifications

The hasSecondaries attribute of the UserGroup demonstrates the use of a renderer in zenpack.yaml to display a coloured icon.

Usage

The new zProperty for zMinUID may be adjusted for a device class or specific device. The default is 0 (all users collected).

Ensure that suitable values for zCommandUsername, zCommandPassword and zKeyPath are customised for the device class and potentially overridden for specific devices.

Test ssh communications from the command line before expecting Zenoss to perform successful ssh communications.

Requirements & Dependencies

• Zenoss Versions Supported: 4.x, 5.x

• External Dependencies:

  • The zenpacklib package that this ZenPack is built on, requires PyYAML. This is installed as standard with Zenoss 5 and with Zenoss 4 with SP457 and later. To test whether it is installed, as the zenoss user, enter the python environment and import yaml:

    python
    import yaml
    yaml
    
    <module 'yaml' from '/opt/zenoss/lib/python2.7/site-packages/PyYAML-3.11-py2.7-linux-x86_64.egg/yaml/__init__.py'>
    

    If pyYAML is not installed, install it, as the zenoss user, with:

    easy_install PyYAML
    

    and then rerun the test above.

• ZenPacks: - None

• Installation Notes:

  • Restart zenoss entirely after installation

Download

Download the appropriate package for your Zenoss version from the list below.

• Zenoss 4.0+ and 5.x Latest Package for Python 2.7

ZenPack installation

This ZenPack can be installed from the .egg file using either the GUI or the zenpack command line.

To install in development mode, find the repository on github and use the Download ZIP button (right-hand margin) to download a tgz file and unpack it to a local directory, say, /code/ZenPacks . Install from /code/ZenPacks with:

zenpack --link --install ZenPacks.community.UserGroup
Restart zenoss after installation.

Device Support

This ZenPack only requires very basic Unix commands on the target devices.

Limitations and Troubleshooting

Change History

• 1.0.0

  • Initial Release

Screenshots

See the screenshots directory.

Acknowledgements