gencode128.dll c# IIS FAILED REQUEST LOGS in Visual C#.NET

Encoding Code 128A in Visual C#.NET IIS FAILED REQUEST LOGS

CHAPTER 18 IIS FAILED REQUEST LOGS
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Running a healthy service in the cloud
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The failed request logs for IIS are a new feature in IIS 7. IIS tracks log data for requests as they come through, but keeps the data only if certain configurable conditions are met. A condition for keeping the log data might be that a response takes too long to complete the request. If the response is completed fast enough, then the log buffer is flushed. You can configure how IIS manages this process in the tracing section of the system.webServer part of your web.config. After you configure failed request tracing for IIS in this way, the logs are collected with the rest of the data logs.
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WINDOWS EVENT LOGS
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Windows event logs can provide important clues to serious problems with your applications. Some applications create custom event log sources for their own logging. The diagnostic agent in Azure can collect these logs and transfer them to storage for you. You need to subscribe to the event data that you want to receive using an XPath expression. Because of the security profile your processes run on, you won t be able to read the security windows event log. If you add this log to your configuration, nothing will be logged, and it won t work correctly until you remove it. To capture Windows event logs, you can use the following expression:
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diagConfig.WindowsEventLog.DataSources.Add("System!*");
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This code grabs everything from the Windows System Event log, which is where you usually want to start your investigations.
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18.3.4 Arbitrary diagnostic sources
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Windows Azure Diagnostics covers a lot of the diagnostic sources you might use to troubleshoot an issue with your system. It covers IIS logs, performance counters, Windows event logs, and several other things. Over time, you ll probably devise your own diagnostic source; maybe a log you re creating that you need to track. Perhaps this is custom billing data, or a compressed log of the images used in production, or it might just be the output of a third-party logging framework you ve chosen to use. The agent can transfer anything you want. All you need to do is get that data into a file in a designated folder. When you configure the agent, you tell it which custom directories you want it to monitor. You need to configure some local storage and then write your log files to it. Each data source has a configuration class that you add to the agent s configuration, and custom log locations aren t any different. We ll use the DirectoryConfiguration class to tell the agent to monitor a folder. You can set how large that directory is allowed to become, as well as scheduled transfer characteristics, as shown in the following code:
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DirectoryConfiguration specialLogsDC = new DirectoryConfiguration(); specialLogsDC.Path = RoleEnvironment.GetLocalResource("specialLogs").RootPath;
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Source directory
Transferring diagnostic data
specialLogsDC.Container = "speciallogs"; instanceConfiguration.Directories .DataSources.Add(specialLogsDC);
419 Destination storage container
Windows Azure Diagnostics is a powerful tool you can use to help troubleshoot and diagnose problems. But it isn t just for problems, as we ve discussed; you can also use it to help monitor the behavior of the system, or the actions of your users. Although Windows Azure Diagnostics is wonderful, it s only a source of data. You still need to analyze the data to turn it into information, and then take action. Sometimes the action you need to take is to change the configuration of the service model you re running your application in. For example, you might need to add some instances to respond to a spike in traffic. Regardless of the result of your analysis, you ll need to store the data you collect in Azure storage to be able to use it. To do this, you use transfers.
18.4 Transferring diagnostic data
The diagnostic agent does a great job of collecting all the local data and storing it on the machine it s running on. But if the diagnostic information is never moved to Azure storage, it won t be any good to anyone. This is where transfers come into play. There are two types of transfers, one of which you have already seen in play. We ve already talked about the scheduled transfer, which sets up a timer and transfers the related data on a regular basis to your storage account. Each data source category has its own transfer schedule. You can transfer performance counter data at a different rate than you transfer the IIS logs. The second type of transfer is an on-demand transfer. You usually perform an ondemand transfer when you have a special request of the data. Let s look at each of these kinds of data transfers in more detail.
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