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Now you just start up HAProxy and reconfigure your service clients to hit the load balancer HAProxy balances traffic evenly across the three hosts and ensures that if one of the hosts goes down, it stops receiving traffic The Passenger or Unicorn servers on the svcs hosts take care of making sure requests are never sent to a worker process that is already busy Figure 85 shows the operation of HAProxy in front of Unicorn The other common way to use HAProxy in a service-oriented architecture is to place it in front of Mongrel or Thin processes that can handle only one request at a time In this configuration, HAProxy handles failover if a Ruby process or host goes down HAProxy also makes sure that requests are routed only to available backends The key to this configuration is the maxconn 1 option, specified at the server level, which tells HAProxy to never allow more than one active connection to Mongrel or Thin at a time Here is how the previous configuration could be updated to balance across two svcs hosts, each running Mongrels on ports 9001 and 9002:

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Modal UITypeEditors are an ideal way to provide a more intuitive way to construct hard-toformat property values By providing a custom form, you give developers whatever editing experience is the most conducive for that property type Figure 930 illustrates how the Digital Time Format Editor dialog makes it easier to edit the clock control's DigitTimeFormat property

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Each server in the NLB has its own installation of the application or service NLB is, therefore, used for services and applications that require little or no state maintenance (for example, Web services and services with no shared storage, although they can have a common link back to a shared resource, such as a SQL database backend) It is common to have multiple Web servers that all have the same content accessed via NLB, because no state is maintained for Web sessions Each time the user makes a request via HTTP/HTTPS, all pertinent information is sent as part of the HTTP request; the server does not have to remember anything If an update to a web site is required, then all sites in the NLB cluster must be updated with the same content to ensure a consistent end-user experience If a server in the NLB group fails, this is detected, and traf c is no longer sent to the unavailable server; instead, it is redistributed to the other servers There are facilities in NLB, so a client is redirected to the server who last communicated with the client, if possible This is useful in cases where some state is desirable (for example, a shopping cart on a web site) through the use of server-side caching NLB is fairly easy to manage If performance starts to become an issue, add an additional server into the NLB group This will lighten the load on the other servers The basic NLB process is displayed in Figure 18-1 The gure shows three Web servers with IP addresses 1921681131 to 133, and they form a NLB group with an address of 1921681130 and an associated DNS name (for example, nlbwebsavilltechnet) A client goes to the Web browser and enters the NLB group DNS name as its target, which is then sent to the NLB group and serviced by one of the three Web servers enabled for NLB Note that there is no separate NLB server that redirects the requests of clients; the NLB runs on each of the servers and handles updating the DNS record if a member of the NLB group becomes unavailable Failover clustering is used when the service being offered needs to maintain a state or when only one server can own the resource being offered and should have shared storage (for example, a le or print server, SQL Server, or Exchange mailbox server) Backend applications and services typically require failover clusters for high availability where the application or service cannot be distributed over multiple servers concurrently In all the example roles le/print server, SQL, Exchange there is a backend data store that can be serviced only by a single server at any one time, given the nature of the service to ensure data consistency If the server offering the service becomes unavailable, another server in the.

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