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Introduction

Versions 2.2 (and newer) of opConfig provide more detailed collection and display of operational status, and now also let you control whether and when old data should be expired. This document describes how to configure these features.

Operational Status

opConfig's new status display (Views -> Operational Status) is a complement to the plain text logs, to make it easier to get an overview of what opConfig is doing to which nodes, when, and how successful it was with these operations. This material grows very quickly and expiration is a must.

To configure expiration you need to set the maximum age of status entries is set in conf/opCommon.nmis:

'opconfig' => {
...
  'opconfig_opstatus_maxage' => 604800, # seconds, 1 week

You may want to reduce this value if your opConfig deployment manages lots of machines. The status material is pruned automatically whenever opConfig performs any kind of operation (GUI or opconfig-cli), if the config entry is set.

Command Revisions

By default opConfig does not remove old revisions from the database; if you run many non-change-detecting commands (or encounter frequent changes in your commands' outputs) then this will likely make the GUI unwieldy (e.g. the revision drop down menus will become very large).

opConfig versions 2.2 and newer let you control the purging of old data in a very flexible fashion.

Protecting Revisions

By default all revisions are unprotected and subject to purging.

Using the GUI

To ensure that a particular revision of a command for a node is not expired and removed, you can set its status to "protected" using the GUI.

To do so, navigate to the Command Output page (click on a command or change entry on one of the overviews, or select Views -> Command Output). The Command Summary panel on the right shows the revision in question, and a Protected/Unprotected status button besides it. Simply click the button to toggle the protection status.

 Automatic Protection

If a command in your command sets has (or has inherited) the property autoprotect_first_revision with value true or 1, then the first revision of a command (for a node) will be marked as "protected". All subsequent revisions will be unprotected. This is useful for establishing a baseline status that you don't want to be removed regardless of its age.

The automatic protection setting establishes only a default protection status; You can still change the status later in GUI.

(Less useful but mentioned for completeness' sake: If you add the tag "_protected" to a command's tags in your command sets, then every new revision for this command will start in the "protected" state.)

The autoprotect_first_revision flag can be set

  1. globally, as opconfig_purging_autoprotect_first_revision in conf/opCommon.nmis,
  2. or for one command set, in the purging_policy section for that set in conf/command_sets.nmis,
  3. or for a particular command, as property autoprotect_first_revision within this command's definition section in conf/command_sets.nmis.

The settings are inherited, and more specific settings override the defaults.

Please note that this feature does not work retroactively and does not adjust the protection status of revisions that were captured in the past.

Purging Policy

There are two criteria for purging of old data:

  • the number of revisions to keep, controlled by the property  keep_last,
  • and the maximum age of a revision, controlled by the property purge_older_than.

To explicitely disable keep_last or purge_older_than simply set the value to 0.

You can use these independently or combined. If both are active, then a revision must meet both criteria before being expired.

For example, setting keep_last = 100 and purge_older_than = 2592000 (1 month, in seconds)  would keep at least the most recent 100 revisions and at least the last month's data - or, in other words, it would prune only revisions that are both outside the newest 100 and older than a month.

Protected revisions are not considered or counted and left untouched. The age of a revision is based on its "last updated" timestamp.

Inheritance, Setting up defaults

You can set a global default purging policy in conf/opCommon.nmis:

'opconfig' => {
...
 'opconfig_purging_keep_last' => 100,        # keep 100 most recent revisions
 'opconfig_purging_purge_older_than' => 31536000, # purge revs older than 1 year
 'opconfig_purging_autoprotect_first_revision' => 'true', # protect the first revision by default

You can extend or overrule that default for a whole command set, in conf/command_sets.d/{vendor-name}.nmis:

'IOS_HOURLY' => {
...
  'purging_policy' => {
    'keep_last' => 1000,
    'purge_older_than' => 2592000, # 30 days
    'autoprotect_first_revision' => 'true', 
  },    

This example overrules all the global defaults for all commands in the IOS_HOURLY set, with a shorter retaining period (but a higher number of minimum entries). 

Finally, you can also set a purging policy for a single command only, again overriding any of the command set or the global defaults. Here is such an example, again configured in conf/command_sets.d/{vendor-name}.nmis:

'TS_LINUX_PROCESSES' => {
...
  'commands' => [
    {
      'multipage' => 'true',
      'privileged' => 'true',
      'command' => 'ps -ef',
	  'keep_last' => 0,
	  'purge_older_than' => 86400, 
      'tags' => [ 'troubleshooting', 'operatingsystem' ],
    },
  ],
},

This example makes sure that for the command "ps -ef" only the last day's revisions are kept, regardless of any global defaults or policy for the TS_LINUX_PROCESSES set. Note that keep_last needs to be disabled explicitely here, or the defaults for this setting would be inherited.

Performing the purging

The purging operation is not automatic and needs to be triggered with opconfig-cli.pl, ideally from a cron job:

# /etc/cron.d/opconfig for example
40 3 * * *     root /usr/local/omk/bin/opconfig-cli-pl act=purge_revisions quiet=1

This cron entry would run a daily purge at 03:40.


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