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Web Interface provides users with access to Citrix Presentation Server applications and content through a standard web browser or through Program Neighborhood Agent This functionality is provided using Java and Net running on a standard web server Web Interface provides the functionality to create three different types of sites: Citrix Presentation Server Program Neighborhood Agent Services Conferencing Manager Guest Attendee
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Disaster Recovery Planning and Configuration
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User Impact No impact DNS time-out delays Down until Web Interface is restored
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Recommended Solution Hardware load balancer DNS multiple host (A) records Restore from backup
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Table 19-3 Web Interface Redundancy Options
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Selecting a Redundancy Solution Web Interface is a vital component of a farm running Presentation Server Clients using Web Interface or Program Neighborhood Agent can no longer connect to the farm if a Web Interface server failure occurs For this reason, Web Interface is one of the most important components to protect from failure Table 19-3 illustrates the recommended redundancy solutions based on the business needs for an acceptable restoration time The times given are specific to XYZ Corp and may not apply to all deployment situations These times are provided as a general guideline for weighing the benefits and costs of each solution Network Load Balancer Citrix recommends using the Citrix NetScaler Application Switch to load balance multiple Web Interface servers (See Figure 19-5) When using a hardware load balancer, remember that the load balancers are not monopolized by Web Interface They can be used for multiple components and services throughout the organization
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Presentation Server Farm
DNS Request to load-balanced name
NetScaler Application Switch Web Interface
Figure 19-5 Load-balancing Web Interface with NetScaler application switches
Citrix Access Suite 4 Advanced Concepts: The Official Guide
When using the Citrix NetScaler Application Switch, the client connects to the fully qualified domain name the switch is using for the Web Interface servers The load balancer then directs the connection to one of the Web Interface servers based on the loadbalancing method If one of the Web Interface servers goes down, the load balancer automatically bypasses that server In Figure 19-5, the NetScaler Application Switches are shown in high-availability mode to avoid a single point of failure This configuration is not required, but it is recommended for maximum availability When configuring the NetScaler Application Switch for Web Interface, create a virtual server along with a service for each of the Web Interface servers For a default Web Interface server, use the following settings for the services and virtual server: Services Without SSL Protocol: HTTP IP Address: IP address of the Web Interface server Port: 80 Monitor: HTTP Virtual Server Without SSL Protocol: HTTP IP Address: IP address of the Web Interface virtual server Port: 80 Persistence: COOKIEINSERT Backup Persistence: SOURCEIP Services with SSL Protocol: SSL_BRIDGE or SSL IP Address: IP address of the Web Interface server Port: 443 Monitor: HTTPS Virtual Server with SSL Protocol: SSL_BRIDGE or SSL IP Address: IP address of the Web Interface virtual server Port: 443 Persistence: SOURCEIP If Microsoft Network Load Balancing or a third-party load balancer is being used, consult its documentation for specific setup details DNS Multiple Host (A) Records Another solution for Web Interface redundancy is configuring DNS to resolve a fully qualified domain name (FQDN) to multiple Web Interface server IP addresses Most DNS servers can return the addresses in the same order or can round-robin among the multiple addresses Modern Web browsers, such as Internet Explorer (IE), use the multiple DNS records that are returned to the client This solution works for redundancy, however, it is not ideal because the end user is subject to DNS time-outs when failures occur
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Disaster Recovery Planning and Configuration
Web Interface 1921680200 Request for WIXYZCOM 3 Presentation Server Farm Return addresses: 1921680200 1921680100 Web Interface 1921680100 DNS Server
Figure 19-6 Load balancing with multiple DNS host (A) records
Figure 19-6 shows this solution during normal operation: 1 The browser running on the client device requests the IP address for WIXYZCOM 2 The DNS server returns multiple IP addresses for the name and those IP addresses are cached on the client device The DNS server can be set to return these addresses in static order or round-robin 3 The client then selects the first IP address from the list and attempts a connection In this example, it connects to 1921680200 Figure 19-7 illustrates what happens during a failure scenario 1 The browser running on the client device requests the IP address for WIXYZCOM 2 The DNS server returns multiple IP addresses for the name and those IP addresses are cached on the client device 3 The client selects the first IP address from the list and attempts a connection In this example, it attempts to connect to 1921680200 This attempt fails because the server is down IMPORTANT In this example, the 1921680200 server is down When this occurs, IE has to wait for the first IP address entry to time-out before moving on to the second While it is performing this process, the end user has to wait for IE and is not presented with any error messages 4 After the attempt to the first address times out, IE automatically attempts the second address and connects successfully in this scenario
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