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Getting Started with Citrix NetScaler
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Deploy a Citrix NetScaler VPX instance
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Install a Citrix NetScaler VPX instance on Microsoft Hyper-V servers
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Install a NetScaler VPX instance on Linux-KVM platform
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Prerequisites for Installing NetScaler VPX Virtual Appliances on Linux-KVM Platform
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Provisioning the NetScaler Virtual Appliance by using OpenStack
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Provisioning the NetScaler Virtual Appliance by using the Virtual Machine Manager
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Configuring NetScaler Virtual Appliances to Use SR-IOV Network Interface
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Configuring NetScaler Virtual Appliances to use PCI Passthrough Network Interface
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Provisioning the NetScaler Virtual Appliance by using the virsh Program
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Deploying NetScaler VPX Instances on AWS
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Upgrade and downgrade a NetScaler appliance
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Overriding Static Proximity Behavior by Configuring Preferred Locations
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Example of a Complete Parent-Child Configuration Using the Metrics Exchange Protocol
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Configuring GSLB Service Selection Using Content Switching
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Configuring Global Server Load Balancing for DNS Queries with NAPTR records
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Using the EDNS0 Client Subnet Option for Global Server Load Balancing
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Persistence and persistent connections
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Advanced load balancing settings
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Gradually stepping up the load on a new service with virtual server–level slow start
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Protect applications on protected servers against traffic surges
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Use source IP address of the client when connecting to the server
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Set a limit on number of requests per connection to the server
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Configure automatic state transition based on percentage health of bound services
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Use case 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
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Use case 3: Configure load balancing in direct server return mode
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Use case 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
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Use case 7: Configure load balancing in DSR mode by using IP Over IP
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Use case 10: Load balancing of intrusion detection system servers
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Use case 11: Isolating network traffic using listen policies
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Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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Configuring a CloudBridge Connector Tunnel between two Datacenters
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Configuring CloudBridge Connector between Datacenter and AWS Cloud
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Configuring a CloudBridge Connector Tunnel Between a Datacenter and Azure Cloud
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Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
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Configuring a CloudBridge Connector Tunnel Between a NetScaler Appliance and Cisco IOS Device
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CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Configuring GSLB Service Selection Using Content Switching
In a typical GSLB deployment, you can prioritize the selection of a set of GSLB services bound to a GSLB virtual server, but you cannot do the following:
- Restrict the selection of a GSLB service from a subset of GSLB services bound to a GSLB virtual server for the given domain.
- Apply different load balancing methods on the different subsets of GSLB services in the deployment.
- Apply spillover policies on a subset of GSLB services, and you cannot have a backup for a subset of GSLB services.
- Configure a subset of GSLB services to serve different content. That is, you cannot content switch between servers in different GSLB sites. The GSLB configuration assumes that the servers contain the same content.
- Define a subset GSLB services with different priorities and specify an order in which the services in the subset are applied to a request.
You can now configure a content switching (CS) policy to customize the GSLB deployment. First configure a set of GSLB services and bind it to a GSLB virtual server. Then, configure a CS virtual server of target type GSLB, define a CS policy and action with the GSLB virtual server as target virtual server, and bind the CS policy to CS virtual server.
Important
- Only CS policies with DNS based expressions can be bound to a CS virtual server of target type GSLB.
- If a GLSB service is bound to a CS virtual server through a GSLB virtual server, you cannot bind another GSLB virtual server bound with the same GSLB service to the CS virtual server.
Example: Consider a GLSB deployment that includes two GSLB sites. At each site, four GSLB services (S-1, S-2, S-3, and S-4) are bound to GSLB virtual server VS-1. You can configure a content switching (CS) virtual server of target type GSLB and define a CS policy and action with VS-1 as the target virtual server, so that requests for content in English are served only by S-1 and S-2, and requests for content in the local language are served only by S-3 and S-4.
You could give S-1 priority by configuring a backup virtual server to VS-1 and binding S-2 to the backup virtual server. Client requests would then be served by S-1 unless the server it represents went down, in which case the requests would be served by S-2. If both S-1 and S-2 were down, clients would receive an empty response.
To configure GSLB Service Selection using Content Switching:
- Configure GSLB. For instructions, see Configuring Global Server Load Balancing.
- Configure a Content Switching (CS) virtual server of target type GSLB. For more information, see Creating Content Switching Virtual Servers.
- Configure Content Switching (CS) policies. For more information, see Configuring Content Switching Policies.
- Configure CS actions that designate a GSLB virtual server as the target virtual server. For more information, see Configuring a Content Switching Action.
- Bind the CS policies to the CS virtual server. For more information, see Binding Policies to a Content Switching Virtual Server.
- Bind the domain to the CS virtual server instead of the GSLB virtual server.
Sample Configuration
The following sample configuration sends requests from the client with IP address 5.5.5.5 to SERVICE_GSLB1 and SERVICE_GSLB2. SERVICE_GSLB1 has a higher priority than SERVICE_GSLB2, and SERVICE_GSLB2 serves the client requests only when SERVICE_GSLB1 is down. If both SERVICE_GSLB1 and SERVICE_GSLB2 are down, SERVICE_GSLB3 and service-GSLB4 are not considered, and a blank response is sent to the client.
>add cs vs CSVSERVER_GSLB http –targettype GSLB
Done
>add gslb vs VSERVER_GSLB1 http
Done
>add gslb vs VSERVER_GSLB2 http
Done
>add gslb vs VSERVER_GSLB_BACKUP1 http
Done
>set gslb vs VSERVER_GSLB1 -backupvserver VSERVER_GSLB_BACKUP1
Done
>add gslb service SERVICE_GSLB1 1.1.1.1 HTTP 80 -sitename site1
Done
>add gslb service SERVICE_GSLB2 1.1.1.2 HTTP 80 -sitename site1
Done
>add gslb service SERVICE_GSLB3 1.1.1.3 HTTP 80 -sitename site2
Done
>add gslb service SERVICE_GSLB4 1.1.1.4 HTTP 80 -sitename site2
Done
>bind gslb vs VSERVER_GSLB1 -servicename SERVICE_GSLB1
Done
>bind gslb vs VSERVER_GSLB_BACKUP1 -servicename SERVICE_GSLB2
Done
>bind gslb vs VSERVER_GSLB2 -servicename SERVICE_GSLB3
Done
>bind gslb vs VSERVER_GSLB2 -servicename SERVICE_GSLB4
Done
>add cs action a1 -targetvserver VSERVER_GSLB1
Done
>add cs policy p1 -rule "CLIENT.IP.SRC.EQ(5.5.5.5)" -action a1
Done
>bind cs vs CSVSERVER_GSLB -domainName www.abc.com
Done
>bind cs vs CSVSERVER_GSLB -policyname p1 -priority 1
Done
>add cs action a2 -targetvserver VSERVER_GSLB2
Done
>add cs policy p2 -rule "CLIENT.IP.SRC.EQ(6.6.6.6)" -action a2
Done
>bind cs vs CSVSERVER_GSLB -policyname p2 -priority 2
Done
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