ZenPack:Linux Monitor

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Organization
Zenoss, Inc.
License
GNU General Public License, Version 2, or later
ZenPack name
ZenPacks.zenoss.LinuxMonitor
More Information
GitHub page/HomePage
Git sources (for cloning)
Link




Linux Monitor ZenPack

This ZenPack monitors the Linux Operating System.

Warning

The ZenPack Catalog has moved to its new home at https://www.zenoss.com/product/zenpacks as of January 17, 2017. The following information may be out of date, and this page will eventually be removed.

Support

This is an Open Source ZenPack developed by Zenoss, Inc. Enterprise support for this ZenPack is available to commercial customers with an active subscription.

Releases

Version 2.2.6- Download
Released on 2017/08/03
Compatible with Zenoss Core 4.2.x, Zenoss Core 5.0.x, Zenoss Core 5.1.x, Zenoss Resource Manager 4.2.x, Zenoss Resource Manager 5.0.x, Zenoss Resource Manager 5.1.x, Zenoss Resource Manager 5.x.x
Version 2.1.3- Download
Released on 2017/03/31
Compatible with Zenoss Core 4.2.x, Zenoss Core 5.0.x, Zenoss Core 5.1.x, Zenoss Resource Manager 4.2.x, Zenoss Resource Manager 5.0.x, Zenoss Resource Manager 5.1.x, Zenoss Resource Manager 5.x.x
Version 2.0.6- Download
Released on 2016/11/01
Compatible with Zenoss Core 4.2.x, Zenoss Core 5.0.x, Zenoss Core 5.1.x, Zenoss Resource Manager 4.2.x, Zenoss Resource Manager 5.0.x, Zenoss Resource Manager 5.1.x

Background

This ZenPack provided monitoring support for Linux, leveraging OpenSSH for data access. In addition to system health, disks, LVM, services, and processes are monitored.

Features

  • Monitors multiple Linux flavors and versions
  • OpenStack LVM volume integration
  • Monitors LVM Physical Volumes, Volume Groups, and Logical Volumes
  • Block Device monitoring
  • Service Monitoring via Sysvinit, Systemd, Upstart
  • Root Cause Analysis with Impact Support
  • Dynamic View support

Bulbgraph.png Note: This version of LinuxMonitor fully replaces EnterpriseLinux. To avoid related errors in zenhub logs, EnterpriseLinux ZP should be removed.

Discovery

The following entities will be automatically discovered. The attributes and collections will be updated on Zenoss normal remodeling interval which defaults to every 12 hours.

Hard Disks
Attributes: Name, Size, LVM PV

Bulbgraph.png Note: On CentOS5, RHEL5 (and possibly others), the lsblk command is not available, in which case this component will be missing.

Bulbgraph.png Note: To ignore unmounted drives, set the zIgnoreUnmounted configuration property to True.

Processors
Attributes: Socket, Manufacturer, Model, Speed, Ext Speed, L1, L2, Voltage
IP Services
Attributes: Name, Protocol, Port, IPs, Description
File Systems
Attributes: Mount Point, Storage Device, Total Bytes, Used Bytes, Free Bytes, % Util
Interfaces
Attributes: IP Interface, IP Addresses, Description, MAC Address, Operational Status, Admin Status
Network Routes
Attributes: Destination, Next Hop, Interface, Protocol, Type
Snapshot Volumes
Attributes: Name, Volume Group, Logical Volume, Size, Block Device, File System, Active
Relations: Logical Volumes
Physical Volumes
Attributes: Name, Format, Size, Free, % Util, Block Device, Volume Group
Relations: Volume Groups
Volume Groups
Attributes: Name, Size, Free, % Util, Snapshot Volumes, Logical Volumes, Physical Volumes
Logical Volumes
Attributes: Name, Volume Group, Size, Block Device, File System, Active, Snapshot Volumes
Relations: Volume Groups
OS Processes
Attributes: Process Class, Process Set, Restart Alert?, Fail Severity
OS Services
Attributes: Name, Loaded Status, Active Status, Main PID, Processes, Description

Bulbgraph.png Note: On some Linux flavors some fields (Loaded Status, Processes, Description) could be empty.


Set Linux Server Monitoring Credentials

All Linux servers must have a device entry in an organizer below the /Devices/Server/SSH/Linux device class.


info
 Tip: The SSH monitoring feature will attempt to use key-based authentication before using a configuration properties password value.
  1. Select Infrastructure from the navigation bar.
  2. Click the device name in the device list. The device overview page appears.
  3. Select Configuration Properties from the left panel.
  4. Verify the credentials for the service account. The zCommandUsername property must be set. To use public key authentication you must verify that the public portion of the key referenced in zKeyPath is installed in the `~/.ssh/authorized_keys` file for the appropriate user on the linux server. If this key has a passphrase you should set it in the zCommandPassword property. If you'd rather use password authentication than setup keys, simply put the user's password in the zCommandPassword property.

    Using a Root User

    This ZenPack requires the ability to run the pvs, vgs, lvs, systemctl, initctl and service commands, remotely on your linux server(s) using SSH. By default, these commands are only allowed to be run locally. To remotely run these commands, the root user must not be required to use TTY.

    1. Install the sudo package on your server.
    2. Allow root user to execute commands via ssh without a TTY.
      1. Edit the /etc/sudoers file.
      2. Find the line containing root ALL=(ALL) ALL.
      3. Add this line underneath it:
        Defaults:root  !requiretty
      4. Save the changes and exit.


    Using a Non-Root User

    This ZenPack requires the ability to run the pvs, vgs, lvs, systemctl, initctl and service commands, remotely on your linux server(s) using SSH. By default, most of these commands are only allowed to be run by the root user. The output of systemctl, initctl and service commands depends on whether they are executed via sudo. Furthermore, this ZenPack expects these commands be in the user's path. Normally this is only true for the root user.

    Assuming that you've created a user named zenmonitor on your linux servers for monitoring purposes, you can follow these steps to allow the zenmonitor user to run the commands.

    1. Install the sudo package on your server
    2. Allow the zenmonitor user to run the commands via ssh without a TTY
      • Edit /etc/sudoers.d/zenoss (Or /etc/sudoers if sudoers.d not supported) and add the following lines to the bottom of the file:: 
        Defaults:zenmonitor        !requiretty
Cmnd_Alias ZENOSS_LVM_CMDS = /sbin/pvs, /sbin/vgs, /sbin/lvs, \
                             /usr/sbin/pvs, /usr/sbin/vgs, /usr/sbin/lvs
Cmnd_Alias ZENOSS_SVC_CMDS = /bin/systemctl list-units *, \
      /bin/systemctl status *, /sbin/initctl list, /sbin/service --status-all, \
      /usr/sbin/dmidecode
zenmonitor ALL=(ALL) NOPASSWD: ZENOSS_LVM_CMDS, ZENOSS_SVC_CMDS
      • Save, ensuring all paths for these commands are correct


    Bulbgraph.png Note: In order for Ssh operation works correctly, ensure OpenSSH is updated to your distro's current version. This is especially true for older versions of RHEL, CentOS, Ubuntu, and Suse Linux.

    Bulbgraph.png Note: For Suse Linux the paths for (pvs, vgs, lvs) are located at /sbin/pvs, /sbin/vgs, and /sbin/lvs respectively. Please ensure that each command can be manually executed remotely.

    Linux Configuration Properties
    Name Description
    zCommandUsername Linux user with privileges to gather performance information.
    zCommandPassword Password for the Linux user.


Bulbgraph.png Note: zSshConcurrentSessions property by default equals to 5. In case of increasing this value user has change sshd daemon configuration on target device by increasing allowed session number and restart sshd daemon.


Add a Linux Server

The following procedure assumes that credentials have been set.


  1. Select Infrastructure from the navigation bar.
  2. Select Add a Single Device from the Add Device list of options. The Add a Single Device dialog appears.
  3. Enter the following information in the dialog:
    Adding Linux Device Details
    Name Description
    Name or IP Linux host to model.
    Device Class /Server/SSH/Linux
    Model Device Select this option unless adding a device with a user name and password different than found in the device class. If you do not select this option, then you must add the credentials (see) and then manually model the device.


  4. Click Add.

Alternatively you can use zenbatchload to add Linux servers from the command line. To do this, you must create a text file with hostname, username and password of all the servers you want to add. Multiple endpoints can be added under the same /Devices/Server/Linux section. Here is an example... 

/Devices/Server/Linux
LinuxDevice zCommandUsername="user", zCommandPassword="password"

You can then load the Linux servers into Zenoss Core or Resource Manager as devices with the following command. 

zenbatchload <filename>

Installed Items

Installing this ZenPack will add the following items to your Zenoss system.

Device Classes
  • /Server/SSH/Linux
Modeler Plugins
  • zenoss.cmd.uname
  • zenoss.cmd.linux.df
  • zenoss.cmd.linux.alt_kernel_name
  • zenoss.cmd.linux.cpuinfo
  • zenoss.cmd.linux.interfaces
  • zenoss.cmd.linux.lvm
  • zenoss.cmd.linux.memory
  • zenoss.cmd.linux.netstat_an
  • zenoss.cmd.linux.netstat_rn
  • zenoss.cmd.linux.process
  • zenoss.cmd.linux.rpm
  • zenoss.cmd.linux.sudo_dmidecode
  • zenoss.cmd.linux.os_release
  • zenoss.cmd.linux.os_service
Monitoring Templates
  • Device (in /Devices/Server/SSH/Linux)
  • HardDisk (in /Devices/Server/SSH/Linux)
  • IpService (in /Devices)
  • FileSystem (in /Devices/Server/SSH/Linux)
  • ethernetCsmacd (in /Devices/Server/SSH/Linux)
  • SnapshotVolume (in /Devices/Server/SSH/Linux)
  • PhysicalVolume (in /Devices/Server/SSH/Linux)
  • VolumeGroup (in /Devices/Server/SSH/Linux)
  • LogicalVolume (in /Devices/Server/SSH/Linux)
  • OSProcess (in /Devices/Server/SSH/Linux)

Monitoring Templates

Device (in /Devices/Server/SSH/Linux)
  • Data Points
    • ssCpuIdlePerCpu
    • ssCpuUserPerCpu
    • ssCpuSystemPerCpu
    • ssCpuWaitPerCpu
    • sysUpTime
    • laLoadInt15
    • laLoadInt5
    • laLoadInt1
    • Buffers
    • Cached
    • MemFree
    • MemTotal
    • SwapFree
    • SwapTotal
    • ssIORawReceived
    • ssIORawSent
  • Thresholds
    • None
  • Graphs
    • CPU Utilization
    • Load Average
    • Memory Utilization
    • Memory Usage
    • IO Throughput
HardDisk (in /Devices/Server/SSH/Linux)
  • Data Points
    • readsCompleted
    • readsMerged
    • sectorsRead
    • msReading
    • writesCompleted
    • writesMerged
    • sectorsWritten
    • msWriting
    • ioInProgress
    • msDoingIO
    • msDoingIOWeighted
  • Thresholds
    • None
  • Graphs
    • Operation Throughtput
    • Merge Rate
    • Sector Throughtput
    • IO Operation in Progress
    • IO Utilization
    • Weighted IO Utilization

Bulbgraph.png Note: There were significant changes between 2.4 and 2.6 in the I/O subsystem. As a result, some statistic information disappeared. The translation from a disk address relative to a partition to the disk address relative to the host disk happens much earlier. All merges and timings now happen at the disk level rather than at both the disk and partition level as in 2.4. There are only *four* fields available for partitions on 2.6 machines and in this case few datapoints will be missed.

IpService (in /Devices)
  • Data Points
    • None
  • Thresholds
    • None
  • Graphs
    • None
FileSystem (in /Devices/Server/SSH/Linux)
  • Data Points
    • usedBlocks
    • percentInodesUsed
    • totalInodes
    • usedInodes
    • availableInodes
  • Thresholds
    • 90 percent used
  • Graphs
    • Utilization
    • Usage
    • Inode Utilization
    • Inode Usage
ethernetCsmacd (in /Devices/Server/SSH/Linux)
  • Data Points
    • ifInOctets
    • ifOutOctets
    • ifInPackets
    • ifOutPackets
    • ifInErrors
    • ifInDropped
    • ifInOverruns
    • ifOutErrors
    • ifOutCarrier
    • ifOutCollisions
    • ifOutDropped
  • Thresholds
    • 75 percent utilization
  • Graphs
    • Data Throughput
    • Packet Throughput
    • Error Rate
SnaphotVolume (in /Devices/Server/SSH/Linux)
  • Data Points
    • state
    • health
  • Thresholds
    • None
  • Graphs
    • None
PhysicalVolume (in /Devices/Server/SSH/Linux)
  • Data Points
    • size
    • free
    • allocatable
    • exported
    • missing
  • Thresholds
    • unallocatable
    • exported
    • missing
  • Graphs
    • Utilization
VolumeGroup (in /Devices/Server/SSH/Linux)
  • Data Points
    • size
    • free
    • partial
  • Thresholds
    • partial
  • Graphs
    • Utilization
LogicalVolume (in /Devices/Server/SSH/Linux)
  • Data Points
    • state
    • health
  • Thresholds
    • None
  • Graphs
    • None
OSProcess (in /Devices/Server/SSH/Linux)
  • Data Points
    • count
    • cpu
    • mem
  • Thresholds
    • count
  • Graphs
    • Process Count
    • CPU Utilization
    • Memory Usage


Service Impact

When combined with the Zenoss Service Dynamics product, this ZenPack adds built-in service impact capability for services running on Linux. The following service impact relationships are automatically added. These will be included in any services that contain one or more of the explicitly mentioned entities.

Service Impact Relationships
  • HardDisk, IpInterface, IpService, OSProcess, CPU, OSService are impacted by LinuxDevice;
  • PhysicalVolume is impacted by HardDisk;
  • VolumeGroup is impacted by PhysicalVolume;
  • LogicalVolume is impacted by VolumeGroup or HardDisk;
  • SnapshotVolume is impacted by LogicalVolume or HardDisk;
  • FileSystem is impacted by SnapshotVolume or LogicalVolume or HardDisk or LinuxDevice


Daemons

Type Name
Modeler zenmodeler
Performance Collector zencommand


Supported flavors

The following flavors of Linux are supported

Linux Flavor Version Released EOS
Ubuntu 12.04 LTS April 2012 April 2017
14.04 LTS April 2014 April 2019
15.04 April 2015 Feb 2016
15.10 Oct 2015 July 2016
RedHat EL RHEL 5 March 2007 March 2017
RHEL 6 Nov 2010 Nov 2020
CentOS 5 March 2017
6 Nov 2020
7 June 2024
SuSE LES SLES 11 March 2022
SLES 12 Oct 2027

Changes

2.1.1
  • Fix "ifconfig" is checked before "ip" Linux Monitor (ZEN-25425)
2.1.0
  • Add cpu_ssCpuUsedPerCpu and mem_MemUsedPercent datapoints. (ZEN-22978)
  • Add common datapoint aliases. (ZEN-24619)
  • Improve ability to model network interface speeds.
  • Improve support for NFS filesystem impact. (ZEN-24478)
  • Improve NFS filesystem linking to NFS server. (ZEN-24478)
  • Disable monitor of NFS mounted filesystems by default. (ZEN-24650)
  • Prevent threshold violations on interfaces with unknown speed.
  • Fix IndexError when modeling older LVM versions. (ZEN-25792)
  • Fix setIdForRelationship error when modeling some LVM versions. (ZEN-22409)
2.0.6
  • Fix "string index out of range" error when modeling older LVM versions (ZEN-25792)
2.0.4
  • Fix "unimplemented" SSH error on 4.2.5 SP709. (ZEN-23392)
2.0.3
  • Fix migration of Linux devices to new type. (ZEN-24293)
2.0.2
  • Added property to ignore unmounted hard disks
  • Improve 1.x to 2.x migration time. (ZEN-24024)
2.0.1
  • Fix invalid event class in filesystem threshold
2.0.0
  • Added support for LVM Physical Volumes, Volume Groups, and Logical Volumes
  • Added support for OpenStack-LVM Integration
  • Added disk (block device) monitoring.
  • Added service monitoring (sysvinit, systemd, upstart).
  • Combined EnterpriseLinux and LinuxMonitor capabilities.
  • Enhanced Impact Support
  • Added Dynamic View Support
  • Completely replaces EnterpriseLinux ZenPack
  • Many other smaller improvements.

Installation

Normal Installation (packaged egg)

  1. Download the appropriate egg file for the version of Zenoss you are running.
  2. Ensure you are logged in as the zenoss user: 
    $ sudo su - zenoss
  3. Install the ZenPack: 
    $ zenpack --install ZenPacks.zenoss.LinuxMonitor-*.egg
  4. Restart these services: 
    $ zenoss restart

Developer Mode Installation

In order to do a development mode installation you will want to clone the existing git repository, and then use the --link flag with the zenpack command:

  1. Ensure you are logged in as the zenoss user: 
    $ sudo su - zenoss
  2. Start by cloning the upstream repository: 
    $ git clone https://github.com/zenoss/ZenPacks.zenoss.LinuxMonitor.git
  3. Next, perform the installation: 
    $ zenpack --link --install ZenPacks.zenoss.LinuxMonitor
  4. Finally, restart these serivices: 
    $ zenoss restart

Discuss

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