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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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Figure 9-5. Specifying port rules for your cluster
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If you double-click the default rule that has been created for you, you will get a dialog box that allows you to define port ranges which govern the load distribution. As you can see in Figure 9-6, I ve made a small adjustment to the session affinity setting by changing it from Single to None.
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Figure 9-6. Disabling client/server affinity
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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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This setting determines whether or not subsequent incoming requests originating from a same single IP address or Class C IP subnet will always be routed to the same node in a cluster. This is, for example, necessary if you run a Web site that uses the old ASP Session model of pre.NET times. In this case, the session state has been stored in memory and is therefore tied to a single machine. Using session affinity allows the developer to be relatively sure that all incoming requests from a client will always be forwarded to the same machine that contains the session data.
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Note This has never been a reliable setting because some especially larger providers employ transparent HTTP proxy arrays, which can cause subsequent requests from a single client to be tunneled via different HTTP proxies (maybe even in different class C subnets). From a server s or cluster s point of view, each request would therefore be originating from a different client without any kind of session affinity. As an alternative, there are third-party network appliances that can, for example, look at an HTTP cookie instead to determine the correct host to handle an incoming session. But this is mostly only relevant for Web sites but not for application servers.
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After clicking OK and confirming the underlying dialog box, you can proceed to add nodes to your cluster. To do so, you need to specify a future node s IP address, click Connect, select a LAN interface on the node, and click Next as illustrated in Figure 9-7.
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Figure 9-7. Adding a node to a cluster
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CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
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The final step before a node is added to a cluster is to specify a unique host ID and confirm the remaining settings as shown in Figure 9-8.
Figure 9-8. Node details
As soon as you finish this dialog box, the cluster will be built. The Network Load Balancing Manager will use Windows Management Instrumentation (WMI) to connect to the specified nodes to configure the cluster settings. Please note that it might take a few seconds or minutes for these changes to be performed. After the first node has been added, you will be presented with the cluster overview as shown in Figure 9-9. Here you can right-click the cluster node and choose Add Host To Cluster to add the second node by performing the last two steps again for a different IP address.
Figure 9-9. Overview of your new cluster
CHAPTER 9 .NET REMOTING TIPS AND BEST PRACTICES
As soon as the configuration process has been completed, you can send requests to the cluster s virtual IP address.
Taking Nodes Online/Offline
I have previously told you about the fact that using NLB clusters to host your remoting components allows you to update your running server systems without affecting any client. Simply unplugging a node from the network (which would in fact simulate the failure of a node) would result in the currently executing requests being cancelled. To reduce the effect on your clients to an absolute minimum, you can instead drain the connections. To do this, right-click a cluster host in NLB Manager and select Control Hosts Drainstop. As soon as you choose this option, the selected node in the cluster will not accept further connection requests, but will still complete all currently running interactions. Once all connections have been closed, the node will automatically be temporarily removed from the cluster. After stopping a node, you can essentially apply any kinds of updates and system changes as the selected node will not respond to incoming requests. As soon as your administrative work has been completed, you can allow the node to rejoin the cluster by clicking Control Hosts Start in NLB Manager.
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