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Figure 12.7 Configuring the TeamCity build agent. Pay close attention to the ownPort variable (the port needs to be open for communication) and the serverUrl variable (it s the TeamCity server location).
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Authorizing a new build agent in TeamCity is required to make it work.
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Simultaneous execution of builds on two different build agents under TeamCity
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Build agents in TeamCity are characterized using system properties and environment variables. You can freely set the requirements for build agents at the project level. For example, you can say that you want your build to run only on Windows machines with .NET Framework 4.0 installed. Let s configure a project to do so:
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Go to the build configuration, and choose the seventh wizard step: Agent Requirements. Add two system property requirements for the build, as shown in figure 12.10 (you can use the Frequently Used Requirements link on the page if you wish).
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Figure 12.10 Build agent with additional system requirements (Windows and installed .NET Framework 4.0). Both of the connected build agents are compatible.
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You can also set the requirements by using environment variables on the build-agent machine. If you wish, you can give your custom variables a condition (like exists or contains ) if you like. The condition will be checked before assigning a job to the build agent. If it s fulfilled, the job will be assigned. If not, another build agent will be used. As you can see, scaling a modern CI server is easy. If you re using CruiseControl. NET, you re in a more difficult situation; you can configure a project trigger to react according to changes on another CCNet server, but you can t design more sophisticated scaling scenarios. On the other hand, if you re using TFS 2010, you have even more possibilities. You can use build queuing and a grid of build agents to perform simultaneous integrations. You can use TFS Proxy for distributed teams. Let s say your headquarters are in America, and you have one offshore team in Asia. If you let the offshore team connect directly to the TFS server at headquarters, you ll most likely end up with internet traffic as a communication bottleneck. It helps to set the TFS Proxy in the offshore location. The developers connect only to the TFS Proxy server, and it optimizes communication with the main TFS server.
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NOTE Some setups use network load balancing with multiple TFS instances to lighten the workload on one TFS application tier. You can find a good paper about scaling TFS 2010 at http://blogs.msdn.com/b/tfsao/archive/2009/11/ 05/scaling-tfs-2010-beta-2.aspx.
Next, let s change directions and look at softer topics. We ll begin with legal issues related to CI.
12.4 Legal roadblocks
The last thing a developer wants to hear about is a legal roadblock to their application being fully tested and deployed. You may well be in such an environment. Federal, state, or local laws may impose restrictions on moving your application internally in your company. One such law in the U.S. is the Sarbanes-Oxley Act, commonly called SOX. Passed in 2002, SOX applies to all publically traded companies regardless of size. The bill was created after several major accounting scandals at firms such as Enron, Tyco, and WorldCom. The law creates tough restrictions on corporate accounting procedures and reporting. It requires that documented processes be in place so that similar accounting scandals don t happen again. But what does a law governing accounting have to do with CI If you re creating internal applications that do any type of accounting, inventory, financial management, and so on, you may have to comply. Briefly, to comply with SOX, developers can t touch QA or production systems. QA can t touch production or development systems. Production can t touch QA or development systems. This may make it more difficult for your CI system to function cleanly.
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