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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 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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Clock synchronization
You can configure your NetScaler appliance to synchronize its local clock with a Network Time Protocol (NTP) server. This ensures that its clock has the same date and time settings as the other servers on your network.
You can configure clock synchronization on your appliance by adding NTP server entries to the ntp.conf file from either the GUI or the command line interface, or by manually modifying the ntp.conf file and then starting the NTP daemon (NTPD). The clock synchronization configuration does not change if the appliance is restarted, upgraded, or downgraded. However, the configuration does not get propagated to the secondary NetScaler in a high availability setup.
Note: If you do not have a local NTP server, you can find a list of public, open access, NTP servers at the official NTP site,
http://www.ntp.org, under Public Time Servers List. Before configuring your NetScaler to use a public NTP server, be sure to read the Rules of Engagement page (link included on all Public Time Servers pages).
In NetScaler release 11, the NTP version has been updated from 4.2.6p3 to 4.2.8p2.
Set clock synchronization
To configure clock synchronization, you must add NTP servers and then enable NTP synchronization.
To add an NTP server by using the command line interface
At the command prompt, type the following commands to add an NTP server and verify the configuration:
add ntp server (<serverIP> | <serverName>) [-minpoll <positive_integer>] [-maxpoll <positive_integer>]
show ntp server
Example
> add ntp server 10.102.29.30 -minpoll 6 -maxpoll 11
To configure an NTP server by using the GUI
Navigate to System > NTP Servers, and create the NTP server.
Start NTP daemon
When you enable NTP synchronization, the NetScaler starts the NTP daemon and uses the NTP server entries in the ntp.conf file to synchronize its local time setting. If you do not want to synchronize the appliance time with the other servers in the network, you can disable NTP synchronization, which stops the NTP daemon (NTPD).
To enable NTP synchronization by using the command line interface
At the command prompt, type one of the following commands:
enable ntp sync
To enable NTP synchronization by using the GUI
Navigate to System > NTP Servers, click Action and select NTP Synchronization.
Configure clock synchronization
You can configure clock synchronization manually by logging on to the NetScaler appliance and editing the ntp.conf file.
To enable clock synchronization on your NetScaler appliance by modifying the ntp.conf file
- Log on to the command line interface.
- Switch to the shell prompt.
- Copy the
/etc/ntp.conf
file to/nsconfig/ntp.conf
, unless the/nsconfig directory
already contains anntp.conf
file. - For each NTP server you want to add, you must add the following two lines to the
/nsconfig/ntp.conf
file:
server <IP address for NTP server> iburst
restrict <IP address for NTP server> mask <netmask> nomodify notrap nopeer noquery
Note: For security reasons, there should be a corresponding restrict entry for each server entry.
Example:
In the following example, an administrator has inserted # characters to “comment out” an existing NTP entry, and then added a new entry:
#server 1.2.3.4 iburst
#restrict 1.2.3.4 mask 55.255.255.255 nomodify notrap nopeer noquery
server 10.102.29.160 iburst
restrict 10.102.29.160 mask 255.255.255.255 nomodify notrap nopeer noquery
5. If the /nsconfig directory does not contain a file named rc.netscaler, create the file.
1. Add the following entry to /nsconfig/rc.netscaler: /bin/sh /etc/ntpd_ctl full_start
This entry starts the ntpd service, checks the ntp.conf file, and logs messages in the /var/log directory.
This process runs every time the NetScaler is restarted.
7. Restart the NetScaler appliance to enable clock synchronization. Or, to start the time synchronization process without restarting the appliance, enter the following commands at the shell prompt:
rm /etc/ntp.conf
ln -s /nsconfig/ntp.conf /etc/ntp.conf
/bin/sh /etc/ntpd_ctl full_start
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