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Chapter 37 Centralized Management Using Clusters
Best Practices and Frequently Asked Questions
Copy vs. Move
When to copy: when you want the cluster to have a setting, and a group or machine to also have no
settings or to have different settings.
settings or to have different settings.
When to move: when you want the cluster to have no setting at all, and for the group or machine to have
the settings.
the settings.
Good CM Design Practices
When you LIST your CM machines, you want to see something like this:
cluster = CompanyName
Group Main_Group:
Machine lab1.example.com (Serial #: XXXXXXXXXXXX-XXXXXXX)
Machine lab2.example.com (Serial #: XXXXXXXXXXXX-XXXXXXX)
Group Paris:
Machine lab3.example.com (Serial #: XXXXXXXXXXXX-XXXXXXX)
Machine lab4.example.com (Serial #: XXXXXXXXXXXX-XXXXXXX)
Group Rome:
Machine lab5.example.com (Serial #: XXXXXXXXXXXX-XXXXXXX)
Machine lab6.example.com (Serial #: XXXXXXXXXXXX-XXXXXXX)
Be careful not to lose track of the level at which you are making changes. For example, if you have
changed the name of your Main_Group (using RENAMEGROUP) to London, it will look like this:
changed the name of your Main_Group (using RENAMEGROUP) to London, it will look like this:
cluster = CompanyName
Group London:
Machine lab1.cable.nu (Serial #: 000F1FF7B3F0-CF2SX51)
...
However, this configuration tends to confuse many administrators, because they begin making changes
to the London systems at the group level, and they stop using the Cluster level as the normal
configuration level for basic settings.
to the London systems at the group level, and they stop using the Cluster level as the normal
configuration level for basic settings.
Tip: it is not a good practice to have a group with the same name as the cluster, e.g. cluster London,
group London. If you are using site names for group names, it is not good practice to have a cluster name
that refers to a location.
group London. If you are using site names for group names, it is not good practice to have a cluster name
that refers to a location.
The correct method, as explained above, is to leave as many settings at the cluster level as possible. In
most cases you should leave your primary site or main collection of machines in the Main_Group, and
use groups for your additional sites. This is true even if you consider that both sites are “equal.”
Remember, CM has no primary/secondary or master/slave servers — all clustered machines are peers.
most cases you should leave your primary site or main collection of machines in the Main_Group, and
use groups for your additional sites. This is true even if you consider that both sites are “equal.”
Remember, CM has no primary/secondary or master/slave servers — all clustered machines are peers.
Tip: if you will be using extra groups you can easily prepare the groups before those extra machines are
joined to the cluster.
joined to the cluster.