Because collections are used as the organizational object for DCM
Because collections are used as the organizational object for DCM, creating collections specifically for DCM should be considered. Chances are, the systems that you need to evaluate won’t fit neatly into the same groupings as software distribution, operating system deployment, or software updates. Building a hierarchy of collections will allow you to define each collection’s membership and isolate the collections from being used for any of these other purposes. One option for creating collections for this purpose is to create an empty collection named Desired Configuration Management Collections. Then create subcollections for each of the system types that you need to evaluate. You can also create collections based on the evaluation that is performed and not on a specific server or operating system type. Figure 14.26 shows an example of collections created for DCM purposes.
Once the collections are created, systems that need to be evaluated for compliance will have to be added as members to the collections. As with any collection, the members can be added to the collection based upon direct membership rules or by using a query. Queries are preferred due to the fact that as systems are added to your network, the systems will be dynamically added and removed from the collection. However, there is merit to using direct membership; once a system is added to the membership of the collection, it will not fall out of the collection until someone manually removes it. Using direct membership guarantees that a system will not be removed from the collection when an invalid configuration change occurs.
Which brings us to another point—when using queries to manage the collection membership, make sure that you do not base the collection membership query on anything that is evaluated by a configuration item. As you can probably imagine, doing so could cause the system to be removed from the collection before the evaluation takes place. You would not be notified of a non-compliant situation if that happens. For example, let’s say you are basing your collection on
systems that have a specific file resident in a specific folder, and at the same time a configuration item is monitoring for the existence of the file. If the file is accidentally removed, there is a good chance that the system will be removed from the collection before the compliance evaluation occurs.
collections specifically for DCM should be considered. Chances are, the systems that you need to evaluate won’t fit neatly into the same groupings as software distribution, operating system deployment, or software updates. Building a hierarchy of collections will allow you to define each collection’s membership and isolate the collections from being used for any of these other purposes. One option for creating collections for this purpose is to create an empty collection named Desired Configuration Management Collections. Then create subcollections for each of the system types that you need to evaluate. You can also create collections based on the evaluation that is performed and not on a specific server or operating system type. Figure 14.26 shows an example of collections created for DCM purposes.
Once the collections are created, systems that need to be evaluated for compliance will have to be added as members to the collections. As with any collection, the members can be added to the collection based upon direct membership rules or by using a query. Queries are preferred due to the fact that as systems are added to your network, the systems will be dynamically added and removed from the collection. However, there is merit to using direct membership; once a system is added to the membership of the collection, it will not fall out of the collection until someone manually removes it. Using direct membership guarantees that a system will not be removed from the collection when an invalid configuration change occurs.
Which brings us to another point—when using queries to manage the collection membership, make sure that you do not base the collection membership query on anything that is evaluated by a configuration item. As you can probably imagine, doing so could cause the system to be removed from the collection before the evaluation takes place. You would not be notified of a non-compliant situation if that happens. For example, let’s say you are basing your collection on
systems that have a specific file resident in a specific folder, and at the same time a configuration item is monitoring for the existence of the file. If the file is accidentally removed, there is a good chance that the system will be removed from the collection before the compliance evaluation occurs.
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26.2 with Donna Believe in the Beat
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