FIGURE 18-10 A test page showing which server handled a request and the URL entered by in .NET

Draw EAN-13 Supplement 5 in .NET FIGURE 18-10 A test page showing which server handled a request and the URL entered by
FIGURE 18-10 A test page showing which server handled a request and the URL entered by
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the user
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Managing NLB
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After the NLB is created and you have added additional nodes, you might not need to do anything else But if you selected port rules that had single node destinations, adjust the priority of the destination nodes because, by default, the priority for the single-mode targets is the node s cluster priority This might not be the desired order
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Port Rule Management
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You have to manage port rules at two levels: at the cluster level to de ne port rules and at the node level to modify priority and loading for existing port rules You cannot set priority and loading at the cluster level, and you
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cannot create new port rules at the node level; you have to interact at both levels To modify the port rules, right-click on the NLB cluster in the console tree and select Cluster Properties Select the Port Rules tab, which displays all the port rules in the same format as when you created the NLB cluster New rules can be added via the Add button and removed with the Remove button If you edit a port rule, you can change all the properties of the rule, including the cluster IP address to respond to, the ports and protocols covered by the rule, and once again the ltering mode (whether it is multiple, single, or disabled, along with af nity required for multiple hosts) This is the place to go to manage port rules Within those port rules, you could de ne a single host as the destination for the port rule, but you had nowhere to con gure which host out of the NLB cluster should receive the traf c Additionally, if the target was multiple hosts, you have no option to load some hosts higher than others This is where the host-speci c properties come into play Expand the console tree cluster entry to display the nodes in the cluster They appear as little computer icons: A green background shows that they are processing requests and are fairly happy; a yellow color means the node is not currently responding to client requests; a gray background means the node is in a suspended state; a red background means the NLB service is not running on the server and is not handling any NLB cluster traf c; and a white X in a red circle means the node is unavailable An hourglass shows that actions are being taken, such as convergence after a change Details for each node include the current status of the node, the node s dedicated IP address and subnet mask, host priority, and the initial host state If a node is selected, as shown in Figure 18-11, the port rules for the NLB cluster are shown, along with any host-speci c attributes There are two rules, which have a mode of single for telnet and FTP Each rule has its own priority for the selected node This is how single host mode rules work A speci c host is not speci ed as the target; this would not make the availability any better than a normal DNS record because if the node was unavailable, you would have to manually change the host, which should now service the speci c port rule (There would be no Time-To-Live timeouts to wait for like with DNS) Instead, the nodes in the NLB each have a priority for each speci c port rule, which by default is the same as the node s priority within the NLB; however, it can be different The node with highest priority (the lowest number for example, 1 is highest priority) for
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a port rule will service the traf c applicable to the rule If the node with the highest priority is unavailable, the second-highest priority will service; if that s not available, the third highest will service, and so on Using this method, only one node services the traf c, but high availability is achieved automatically as lower-priority nodes for each rule can provide service if required
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FIGURE 18-11 The node-speci c port rule con gurations To change these values, right-click on the node in the console tree and select Host Properties from the context menu This opens up the nodespeci c information, which allows dedicated IP addresses for the host to be con gured via the Host Parameters tab; additionally, the cluster IP and con guration can be viewed but not changed The last tab shows the Port Rules for the cluster with only the ability to edit the rules enabled; you can t add or remove After you open a rule, everything is unavailable to change except for the handling priority for a single host mode rule or the Load weight for a multiple host mode rule In Figure 18-12, a single host rule is being edited, which allows the handling priority to be modi ed from 1-32 (You can have 32 nodes in a NLB cluster) The priorities that are not currently assigned for the port rule to other nodes in the cluster are available If, for example, you want to make a node number 1 and another node currently has the handling priority of 1, you will rst need to change the priority on the existing number 1 node s port rules (to 3, for example, because the node you want to make 1 is probably number 2); then you can set the handling priority to 1 for the new number 1 node The other type of con guration is load balancing If you select a multiple host rule, you can modify the load weight By default, load weight is set to Equal, so all nodes process the incoming requests evenly However, you can assign a load weight between 0 and 100 to enable speci c nodes to receive more connections than others If you give a node a weight of 0, it receives no portion of the traf c; however, a load of 100 does
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