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Some web servers run many applications within one app pool. If issues occur on an individual site, it can be difficult for an administrator to determine which particular application is having difficulties. ASP.NET 4.0 introduces additional performance counters allowing you to monitor individual applications CPU and memory usage. To utilize this, you must add the appDomainResourceMonitoring setting to Aspnet.config (Aspnet.config is located where the .NET framework is installed: C:\Windows\Microsoft.NET\ Framework\v4.0.21006): <runtime> <appDomainResourceMonitoring enabled="true"/> </runtime> When you have added this line go into perfmon and you should find that you will have access to two new performance counters in the ASP.NET applications performance category section (Figure 10.6): Managed Processor Time Managed Memory Used

s Caution When logging to files, syslogd allows you to add a hyphen (-) to the front of the filename like

this: -/var/log/auth. This tells syslog to not sync the file after writing to it. This is designed to speed up the process of writing to the log. But it can also mean that if your system crashes between write attempts, you will lose data. Unless your logging system is suffering from performance issues, I recommend you do not use this option.

You can also log to a remote system (see Listing 5-4). Listing 5-4. Logging to a Remote System mail @puppy.yourdomain.com

Microsoft purchased and integrated the Dundas ASP.NET charting controls in early 2008. This set contains over 35 different types of charts and a huge amount of functionality, some of which is shown in Figure 10-7. Previously these controls had to be installed as an add-on and a number of settings added to Web.config. ASP.NET 4.0, however, includes these controls, and it is no longer necessary to make changes to Web.config to include them.

In this example all mail messages are sent to the host puppy.yourdomain.com on UDP port 514. This requires that the syslogd daemon on puppy is started with the -r option; otherwise, the syslogd port will not be open.

s Caution Opening syslogd to your network is a dangerous thing. The syslogd daemon is not selective about where it receives messages from. There are no access controls, and any system on your network can log to the syslogd port. This opens your machine to the risk of a DoS attack or of a rogue program flooding your system with messages and using all the space in your log partition. I will briefly discuss some methods by which you can reduce the risk to your system, but if you are serious about remote logging I recommend you look at the syslog-NG section. I will also discuss secure logging using the syslog-NG tool in conjunction with Stunnel in the Secure Logging with syslog-NG section.

You can also combine multiple selectors in your syslog.conf file, allowing for more sophisticated selections and filtering. For example, you can list multiple facilities separated by commas in a selector. See Listing 5-5. Listing 5-5. Multiple Facilities auth,auth-priv.crit /var/log/auth

Figure 10-7. A simple ASP.NET chart To add a chart to your web page simply drag the Chart control from the toolbox or add a reference to System.Web.DataVisualization and the Register directive below (note this may be slightly different for the final release of VS2010): <%@ Register Assembly="System.Web.DataVisualization, Version=4.0.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35" Namespace="System.Web.UI.DataVisualization.Charting" TagPrefix="asp" %> Charts are then added to the page with the following code: <asp:Chart runat="server"> <series><asp:Series Name="Series1"></asp:Series></series> <chartareas><asp:ChartArea Name="ChartArea1"></asp:ChartArea></chartareas> </asp:Chart>

This sends all auth messages and all auth-priv messages with a priority of crit or higher to the file /var/log/auth. You cannot do this with priorities, though. If want to list multiple priorities, you need to list multiple selectors separated by semicolons, as shown in Listing 5-6. Listing 5-6. Multiple Priorities auth;auth-priv.debug;auth-priv.!=emerg /var/log/auth

This example shows you how to send all auth messages and all auth-priv messages with a priority of debug or higher, excluding auth-priv messages of emerg priority to the file /var/log/auth.

s Just remember with multiple selectors that filtering works from left to right; syslogd will process Tip the line starting from the selectors on the left and moving to the right of each succeeding selector. With this in mind, place the broader filters at the left, and narrow the filtering criteria as you move to the right.

You can also use multiple lines to send messages to more than one location, as shown in Listing 5-7. Listing 5-7. Logging to Multiple Places auth auth.crit auth.emerg /var/log/auth bob /dev/console

The following code binds a series of random points to the chart: Random r = new Random(); Series series = new Series("Line"); series.ChartType = SeriesChartType.Line; for (int i = 0; i < 100; i++) { series.Points.AddY(r.Next(0,100)); } chart1.Series.Add(series);