For Debian or Ubuntu, that would be this command: You’ll find a lot of lines in there, but the important ones are the server lines.
You can get a list of server addresses at ntp.org, find the preferred ones for your area, and then add them to the file.
Use legitimate servers or your ISPs NTP or DNS servers as clock sources. entirely as they can do the initial setting of the date.
I'm trying to use NTPD to update my Linux machine's time to a specified NTP server.
Here is the scenario: Each time the Linux machine starts up, I want to update the time from NTP server and if it's not successful, I want to try again every 5 minutes until successfully (max is 2 hours). ) use NTPD and use some command like: Note that I want to execute the above commands in a shell script and will put the shell in a web server.
Iran Libya Navajo posix ROK UTC Arctic CET Eire GB Greenwich iso3166MET NZ posixrules Singapore WET Asia Chile EST GB-Eire Hongkong Israel Mexico NZ-CHAT PRC Turkey W-SU Atlantic CST6CDT EST5EDT GMT HST Jamaica Mideast Pacific PST8PDT UCT zone.tab[[email protected] ~]# ls /usr/share/zoneinfo Africa Australia Cuba Etc GMT0 Iceland Japan MST Poland right Universal Zulu America Brazil EET Europe GMT-0 Indian Kwajalein MST7MDT Portugal ROC US Antarctica Canada Egypt Factory GMT 0 Iran Libya Navajo posix ROK UTC Arctic CET Eire GB Greenwich iso3166MET NZ posixrules Singapore WET Asia Chile EST GB-Eire Hongkong Israel Mexico NZ-CHAT PRC Turkey W-SU Atlantic CST6CDT EST5EDT GMT HST Jamaica Mideast Pacific PST8PDT UCT Network Time Protocol (NTP) is a standard way of synchronizing computer clocks across a network.
Using NTP you can keep your server’s clock synchronized with super accurate atomic clocks located around the world. Also keep in mind that ntp only affects the system time.
The procedures in this section show how to verify that the default NTP configuration is working correctly.
If your instance does not have access to the Internet, you need to configure NTP to query a different server in your private network to keep accurate time.If your instance's date and time are not set correctly, the date in the signature may not match the date of the request, and AWS rejects the request.Network Time Protocol (NTP) is configured by default on Amazon Linux instances, and the system time is synchronized with a load-balanced pool of public servers on the Internet and set to the UTC time zone. Amazon Linux instances are set to the UTC (Coordinated Universal Time) time zone by default, but you may wish to change the time on an instance to the local time or to another time zone in your network.You can use a program named peers remote local st poll reach delay offset disp ======================================================================= *min-time-0184.108.40.206 1 1024 377 0.07047 0.014673 0.14360 =dns-01.esd189.o 10.0.0.15 2 1024 377 0.07587 0.022277 0.13660 ntpdc Great! I 'm going to execute a shell script in a C program.And wanted to check the return value (maybe I'll use the system("shellscript") function).Three is usually adequate, and more than five is excessive.