This operation guide describes how to configure time zone of the DNS using DST.

Conditions

• Log in to the server as user root through telnet mode.
• The GMT format can be used by the countries and regions that do not use DST. The time zone code format must be used by the countries and regions that use DST. Otherwise, the operating system does not support the automatic DST change.
• The government may adjust the DST rule of a time zone owing to various reasons. Therefore, you need to query the DST rule of the corresponding time zone based on the time zone code before setting DST. This ensures that the DST rule defined by the time zone code is consistent with the actual DST rule.
• When the DST rule of a time zone are adjusted, the Sun may release the code patch of this time zone. You can install the code patch to obtain the latest time zone code and DST rule.
• The setting of the DNS DST leads to the change of the time at the Solaris bottom layer. In this case, all the timers depending on the operating system are reset or invalidated. To avoid the function failure caused by invalid timers, you need to stop the DNS services before you set the DNS DST. During this period, the performance data and alarm data of the managed NEs cannot be handled in time. After the DNS services are restored, the DNS starts the automatic synchronization function, and collects and handles the missing performance data and alarm data from the managed NEs.
• If you need to set DST and change time, set DST first.

Query the local time zone name.

1. Log in to the Solaris server as user root through telnet.
2. Obtain the information on the country code of the time zone.

   # more /usr/share/lib/zoneinfo/tab/country.tab

   A part of the content to be obtained from the file is as follows:

   .. BR Brazil CL Chile CN China ...

   Based on the previous information, you can confirm that the country codes of Brazil, Chile, and China are BR, CL, and CN respectively.

3. Based on country codes, obtain the information on time zone names.

   # more /usr/share/lib/zoneinfo/tab/zone_sun.tab 

   • The format of the zone_sun.tab file is country code + longitude and latitude + time zone name + comments.
   • The north latitude and the east longitude are considered to be positive. The south latitude and the west longitude are considered to be negative.

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What is DST?

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