Getting Started with Citrix ADC
Deploy a Citrix ADC VPX instance
Install a Citrix ADC VPX instance on VMware ESX
配置Citrix ADC Virtual Appliances to use VMXNET3 Network Interface
配置Citrix ADC Virtual Appliances to use Single Root I/O Virtualization (SR-IOV) Network Interface
Migrating the Citrix ADC VPX from E1000 to SR-IOV or VMXNET3 Network Interfaces
配置Citrix ADC Virtual Appliances to use PCI Passthrough Network Interface
Install a Citrix ADC VPX instance on Microsoft Hyper-V servers
Install a Citrix ADC VPX instance on Linux-KVM platform
Prerequisites for Installing Citrix ADC VPX Virtual Appliances on Linux-KVM Platform
Provisioning the Citrix ADC Virtual Appliance by using OpenStack
Provisioning the Citrix ADC Virtual Appliance by using the Virtual Machine Manager
配置Citrix ADC Virtual Appliances to Use SR-IOV Network Interface
配置Citrix ADC Virtual Appliances to use PCI Passthrough Network Interface
Provisioning the Citrix ADC Virtual Appliance by using the virsh Program
Provisioning the Citrix ADC Virtual Appliance with SR-IOV, on OpenStack
配置a Citrix ADC VPX Instance on KVM to Use OVS DPDK-Based Host Interfaces
Deploy a Citrix ADC VPX instance on Microsoft Azure
Network architecture for Citrix ADC VPX instances on Microsoft Azure
Configure multiple IP addresses for a Citrix ADC VPX standalone instance
Configure a high-availability setup with multiple IP addresses and NICs
Configure a high-availability setup with multiple IP addresses and NICs by using PowerShell commands
Configure HA-INC nodes by using the Citrix high availability template with Azure ILB
Configure address pools (IIP) for a Citrix Gateway appliance
Upgrade and downgrade a Citrix ADC appliance
Authentication, authorization, and auditing application traffic
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Persistence and persistent connections
Advanced load balancing settings
Gradually stepping up the load on a new service with virtual server–level slow start
Protect applications on protected servers against traffic surges
Retrieve location details from user IP address using geolocation database
Use source IP address of the client when connecting to the server
Set a limit on number of requests per connection to the server
Configure automatic state transition based on percentage health of bound services
Use case 2: Configure rule based persistence based on a name-value pair in a TCP byte stream
Use case 3: Configure load balancing in direct server return mode
Use case 6: Configure load balancing in DSR mode for IPv6 networks by using the TOS field
Use case 7: Configure load balancing in DSR mode by using IP Over IP
Use case 11: Isolating network traffic using listen policies
Use case 12: Configure Citrix Virtual Desktops for load balancing
Use case 13: Configure Citrix Virtual Apps for load balancing
Use case 14: ShareFile wizard for load balancing Citrix ShareFile
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配置一个CloudBridge连接器之间的隧道a Citrix ADC Appliance and Virtual Private Gateway on AWS
配置CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
配置一个CloudBridge连接器之间的隧道a Citrix ADC Appliance and Cisco IOS Device
配置一个CloudBridge连接器之间的隧道a Citrix ADC Appliance and Fortinet FortiGate Appliance
CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Least packets method
A load balancing virtual server configured to use the least packets method selects the service that has received the fewest packets in the last 14 seconds.
For example, consider three services, Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3.
- Service-HTTP-1 has handled three packets in last 14 seconds.
- Service-HTTP-2 has handled five packets in last 14 seconds.
- Service-HTTP-3 has handled two packets in last 14 seconds.
下图说明了CitrixDC appliance uses the least packets method to choose a service for each request that it receives.
Figure 1. How the Least Packets Load Balancing Method Works
The Citrix ADC appliance selects a service by using the number of packets (N) transmitted and received by each service in the last 14 seconds. Using this method, it delivers requests as follows:
- Service-HTTP-3 receives the first request, because this service has the lowest N value.
- Since Service-HTTP-1 and Service-HTTP-3 now have the same N value, the virtual server switches to the round robin method. Service-HTTP-1 therefore receives the second request, Service-HTTP-3 receives the third request, Service-HTTP-1 receives the fourth request, Service-HTTP-3 receives the fifth request, and Service-HTTP-1 receives the sixth request.
- Since Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3 all now have same N value, the virtual server switches to the round robin method for Service-HTTP-2 as well, including it in the round robin list. Therefore, Service-HTTP-2 receives the seventh request, Service-HTTP-3 receives the eighth request, and so on.
The following table summarizes how N is calculated.
Request Received | Service Selected | Current N Value | Remarks |
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Request-1 | Service-HTTP-3; (N = 2) | N = 3 | Service-HTTP-3 has the lowest N value. |
Request-2 | Service-HTTP-1; (N = 3) | N = 4 | Service-HTTP-1 and Service-HTTP-3 have the same N values. |
Request-3 | Service-HTTP-3; (N = 3) | N = 4 | Service-HTTP-1 and Service-HTTP-3 have the same N values. |
Request-4 | Service-HTTP-1; (N = 4) | N = 5 | - |
Request-5 | Service-HTTP-3; (N = 4) | N = 5 | - |
Request-6 | Service-HTTP-1; (N = 5) | N = 6 | Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3 have the same N values. |
Request-7 | Service-HTTP-2; (N = 5) | N = 6 | Service-HTTP-1, Service-HTTP-2, and Service-HTTP-3 have the same N values. |
Request-8 | Service-HTTP-3; (N = 5) | N = 6 | - |
Note: If you enable the RTSP NAT option on the virtual server, the applianace uses the number of data and control packets to calculate the number of packets for RTSP services. For more information about RTSP NAT option, seeManaging RTSP Connections.
The Citrix ADC appliance also performs load balancing by using the number of packets and weights when a different weight is assigned to each service. It selects a service by using the value (Nw) in the following expression:
Nw = (N) * (10000 / weight)
As in the preceding example, suppose Service-HTTP-1 is assigned a weight of 2, Service-HTTP-2 is assigned a weight of 3, and Service-HTTP-3 is assigned a weight of 4. The Citrix ADC appliance delivers requests as follows:
- Service-HTTP-3 receives the first second, third, fourth, and fifth requests, because this service has the lowest Nw value.
- Service-HTTP-1 receives the sixth request, because this service has the lowest Nw value.
- Service-HTTP-3 receives the seventh request, because this service has the lowest Nw value.
- Service-HTTP-2 receives the eighth request, because this service has the lowest Nw value.
The following table summarizes how Nw is calculated.
Request Received | Service Selected | Current Nw Value (Number of Active Transactions) * (10000 / weight) | Remarks |
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Request-1 | Service-HTTP-3; (Nw = 5000) | Nw = 5000 | Service-HTTP-3 has the lowest Nw value. |
Request-2 | Service-HTTP-3; (Nw = 5000) | Nw = 7500 | - |
Request-3 | Service-HTTP-3;(Nw = 7500) | Nw = 10000 | - |
Request-4 | Service-HTTP-3; (Nw = 10000) | Nw = 12500 | - |
Request-5 | Service-HTTP-3; (Nw = 12500) | Nw = 15000 | - |
Request-6 | Service-HTTP-1; (Nw = 15000) | Nw = 20000 | Service-HTTP-1 and Service-HTTP-3 have the same Nw value. |
Request-7 | Service-HTTP-3; (Nw = 15000) | Nw = 17500 | Service-HTTP-1 and Service-HTTP-3 have the same Nw value. |
Request-8 | Service-HTTP-2; (Nw = 16666.67) | Nw = 20000 | Service-HTTP-2 has the lowest Nw value. |
The following diagram illustrates how the virtual server uses the least packets method when weights are assigned.
Figure 2. How the Least Packets Method Works When Weights Are Assigned
To configure the least packets method, see配置a Load Balancing Method that Does Not Include a Policy.
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