ADC

Clock synchronization

August 1, 2023

Contributed by:

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. NTP uses User Datagram Protocol (UDP) port 123 as its transport layer. Add NTP servers in the NTP configuration file so that the appliance periodically gets updates from these servers.

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 at http://www.ntp.org.

To configure clock synchronization on your appliance, follow these steps:

Log on to the command line and enter the shell command.
At the shell prompt, copy the ntp.conf file from the /etc directory to the /nsconfig directory. If the file already exists in the /nsconfig directory, make sure that you remove the following entries from the ntp.conf file:

restrict localhost

restrict 127.0.0.2

These entries are required only if you want to run the device as a time server. However, this feature is not supported on the NetScaler appliance.
Edit /nsconfig/ntp.conf by typing the IP address for the desired NTP server under the file’s server and restrict entries.
Create a file named rc.netscaler in the /nsconfig directory, if the file does not already exist in the directory.
Edit /nsconfig/rc.netscaler by adding the following entry: /bin/sh /etc/ntpd_ctl full_start.

This entry starts the ntpd service, and checks the ntp.conf file.

If you do not want to forcibly sync the time when there is a large difference, you can set the date manually and then start ntpd again. You can check the time difference between the appliance and the time server, by running the following command in the shell:
```
ntpdate -q <IP address or domain name of the NTP server>

```
Reboot the appliance to enable clock synchronization.

Note: If you want to start time synchronization without restarting the appliance, enter one of the following commands at the shell prompt:
```
/usr/sbin/ntpd -c /nsconfig/ntp.conf -g -p /var/run/ntpd.pid -l /var/log/ntpd.log &

or

/bin/sh /etc/ntpd_ctl full_start


```

The official version of this content is in English. Some of the Cloud Software Group documentation content is machine translated for your convenience only. Cloud Software Group has no control over machine-translated content, which may contain errors, inaccuracies or unsuitable language. No warranty of any kind, either expressed or implied, is made as to the accuracy, reliability, suitability, or correctness of any translations made from the English original into any other language, or that your Cloud Software Group product or service conforms to any machine translated content, and any warranty provided under the applicable end user license agreement or terms of service, or any other agreement with Cloud Software Group, that the product or service conforms with any documentation shall not apply to the extent that such documentation has been machine translated. Cloud Software Group will not be held responsible for any damage or issues that may arise from using machine-translated content.

Clock synchronization

August 1, 2023

Contributed by:

August 1, 2023

Contributed by:

Clock synchronization

In this article