Getting Started with Citrix ADC
Deploy a Citrix ADC VPX instance
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
Configuring Citrix ADC Virtual Appliances to Use SR-IOV Network Interface
Configuring 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
Configuring 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 address pools (IIP) for a Citrix Gateway appliance
Upgrade and downgrade a Citrix ADC appliance
Solutions for Telecom Service Providers
Load Balance Control-Plane Traffic that is based on Diameter, SIP, and SMPP Protocols
Provide Subscriber Load Distribution Using GSLB Across Core-Networks of a Telecom Service Provider
Authentication, authorization, and auditing application traffic
Configuring authentication, authorization, and auditing policies
Configuring Authentication, authorization, and auditing with commonly used protocols
Use an on-premises Citrix Gateway as the identity provider for Citrix Cloud
Troubleshoot authentication issues in Citrix ADC and Citrix Gateway with aaad.debug module
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Load balancing algorithms
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 client source IP address for backend communication in a v4-v6 load balancing configuration
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 10: Load balancing of intrusion detection system servers
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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Configuring a CloudBridge Connector Tunnel between two Datacenters
Configuring CloudBridge Connector between Datacenter and AWS Cloud
Configuring a CloudBridge Connector Tunnel Between a Datacenter and Azure Cloud
Configuring CloudBridge Connector Tunnel between Datacenter and SoftLayer Enterprise Cloud
Configuring a CloudBridge Connector Tunnel Between a Citrix ADC Appliance and Cisco IOS Device
CloudBridge Connector Tunnel Diagnostics and Troubleshooting
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Load balancing algorithms
负载平衡算法定义了标准that the Citrix ADC appliance uses to select the service to which to redirect each client request. Different load balancing algorithms use different criteria. For example, the least connection algorithm selects the service with the fewest active connections, while the round robin algorithm maintains a running queue of active services, distributes each connection to the next service in the queue, and then sends that service to the end of the queue.
Some load balancing algorithms are best suited to handling traffic on websites, others to managing traffic to DNS servers, and others to handling complex web applications used in e-commerce or on company LANs or WANs. The following table lists each load balancing algorithm that the Citrix ADC appliance supports, with a brief description of how each operates.
Name | Server selection based on |
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LEASTCONNECTION | Which service currently has the fewest client connections. This is the default load balancing algorithm. |
ROUNDROBIN | Which service is at the top of a list of services. After that service is selected for a connection, it moves to the bottom of the list. |
LEASTRESPONSETIME | Which load balanced server currently has the quickest response time. |
URLHASH | A hash of the destination URL. |
DOMAINHASH | A hash of the destination domain. |
DESTINATIONIPHASH | A hash of the destination IP address. |
SOURCEIPHASH | A hash of the source IP address. |
SRCIPDESTIPHASH | A hash of the source and destination IP addresses. |
CALLIDHASH | A hash of the call ID in the SIP header. |
SRCIPSRCPORTHASH | A hash of the client’s IP address and port. |
LEASTBANDWIDTH | Which service currently has the fewest bandwidth constraints. |
LEASTPACKETS | Which service currently is receiving the fewest packets. |
CUSTOMLOAD | Data from a load monitor. |
TOKEN | The configured token. |
LRTM | Fewest active connections and the lowest average response time. |
Depending on the protocol of the service that it is load balancing, the Citrix ADC appliance sets up each connection between client and server to last for a different time interval. This is called load balancing granularity, of which are three types: request-based, connection-based, and time-based granularity. The following table describes each type of granularity and when each is used.
Granularity | Types of Load Balanced Service | Specifies |
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Request -based | HTTP或HTTPS | A new service is chosen for each HTTP request, independent of TCP connections. As with all HTTP requests, after the Web server fulfills the request, the connection is closed. |
Connection-based | TCP and TCP-based protocols other than HTTP | A service is chosen for every new TCP connection. The connection persists until terminated by either the service or the client. |
Time-based | UDP and other IP protocols | A new service is chosen for each UDP packet. Upon selection of a service, a session is created between the service and a client for a specified period of time. When the time expires, the session is deleted and a new service is chosen for any additional packets, even if those packets come from the same client. |
During startup of a virtual server, or whenever the state of a virtual server changes, the virtual server can initially use the round robin method to distribute the client requests among the physical servers. This type of distribution, referred to asstartup round robin,有助于防止不必要的负载在一台服务器上as the initial requests are served. After using the round robin method at the startup, the virtual server switches to the load balancing method specified on the virtual server.
The Startup RR Factor works in the following manner:
- If the Startup RR Factor is set to zero, the appliance switches to the specified load balancing method depending on the request rate.
- If the Startup RR Factor is any number other than zero, the appliance uses the round robin method for the specified number of requests before switching to the specified load balancing method.
- By default, the Startup RR Factor is set to zero.
Note: You cannot set the startup RR Factor for an individual virtual server. The value you specify applies to all the virtual servers on the Citrix ADC appliance.
To set the startup round-robin factor by using the CLI
At the command prompt, type:
set lb parameter -startupRRFactor
Example
set lb parameter -startupRRFactor 25000
To set the startup round-robin factor by using the GUI
- Navigate to Traffic Management > Load Balancing > Configure Load Balancing Parameters, and set the Startup RR Factor.
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