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Enterprise policy management
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Policy-based management with central management servers
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Earlier in the chapter we covered the process of importing and evaluating a policy against a single server. Using central management servers, we re able to do that against all of the registered servers in one action. Further, each server that fails policy validation can then be configured at the click of a button. To demonstrate, let s use the central management server from figure 8.14. Under the Production Servers group, we have two registered servers. In a real-world enterprise environment, we d obviously have more servers and more groups. Let s rightclick on the Production Servers group and select Evaluate Policies. In the window that opens (shown in figure 8.15), we can select the location of a policy file. This can be either one of the predefined policies or one that we ve exported from an existing instance. Let s select the predefined Surface Area Configuration policy.
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Figure 8.15 After rightclicking a central management server group and choosing Evaluate Policies, we can choose the policy source and click Evaluate.
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By clicking Evaluate, we re evaluating the policy across all of the servers in the configuration group. In our example, as shown in figure 8.16, one of the servers passed validation and one failed. The great thing about evaluating policies in this manner is that you can reconfigure servers that fail validation by simply selecting the check box next to that server name and clicking Apply.
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Figure 8.16 Evaluating a policy against a central management server group lets you evaluate and reconfigure groups of servers in a single step.
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In the introduction to this chapter we spoke about the problem of coming into a poorly managed environment and being presented with the task of assessing a large number of servers for best practice. By grouping the servers with central management servers, you can validate policies across groups of servers, and you can easily reconfigure those that fail validation by clicking the Apply button. Once they re configured, you can import policies into each of the servers with a scheduled evaluation mode to ensure their ongoing compliance. To make this even easier, import the policies against a central management server group, which will perform the import against each of the servers in the group.
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At best, documenting server configuration produces an historical snapshot of how a server looked at a given moment. At worst, it s a monumental waste of time, particularly if the configuration changes in an uncontrolled manner. In contrast, policybased management provides a much more efficient living document of server configuration. Better still, its Apply function enables simple reconfiguration should the server deviate from the desired state.
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Let s wrap up this chapter with a brief look at some advanced policy-based management techniques.
Advanced policy-based management
The policies we ve looked at so far have all been based on static server properties, such as checking the value of various surface area configuration properties to determine whether xp_cmdshell is enabled. In this section, we ll look at ways of enabling more advanced, or dynamic, policy checks. We ll also cover the benefits of combining policybased management with PowerShell.
ExecuteWql() and ExecuteSql()
Earlier in the chapter we covered some of the policies included with SQL Server 2008 that can be imported for evaluation. One of these policies is used to detect the presence of I/O delay messages in the Windows Event Log. Clearly, this is a very different type of policy from those we ve covered so far. Let s import the policy file Windows Event Log I_O Delay Warning.xml and have a look at its condition. As shown in figure 8.17, we can see that rather than use one of the familiar condition fields such as @AutoClose, it uses what appears to be a function call. By clicking the ellipsis button next to the field, we enter the Advanced Edit mode, as shown in figure 8.18. Here, we can see that this policy uses the ExecuteWql() function to query the Windows Event Log for a particular error event code. The ExecuteWql() function permits you to use Windows Management Instrumentation (WMI), specifically the WMI Query Language (WQL), to query the operating system for information. The usage shown here is one example of a nearly limitless number of possible uses.
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