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CHAPTER 9 CONFIGURING NETWORK INFRASTRUCTURE SERVICES
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Synchronizing time with other servers in an NTP hierarchy uses the concept of stratum. Every server in the NTP hierarchy has a stratum setting between 1 and 15, but with a stratum of 16 being used to signify that a clock is not currently synchronized at all. The highest stratum level that a clock can use is 1. Typically, this is a server that s connected directly to an atomic clock with a very high accuracy. The stratum level that is assigned to a server that s directly connected to an external clock depends on the type of clock that s used. In general, though, the more reliable the clock is, the higher the stratum level will be. A server can get its time in two different ways: by synchronizing with another NTP time server or by using a reference clock. If a server synchronizes with an NTP time server, the stratum used on that server will be determined by the server it s synchronizing with: if a server synchronizes with a stratum 3 time server, it automatically becomes a stratum 4 time server. If, on the other hand, a reference clock is used, a server does not get its time from a server on the Internet but instead determines its own time. Again, the default stratum used is determined by the type and brand of reference clock that s used. If it s a very reliable clock, such as one synchronized via GPS, the default stratum setting will be high. If a less reliable clock (such as the local clock in a computer) is used, the default stratum will be lower. If a server gets its time from the Internet, it makes sense to use Internet time and use a very trustworthy time server. If no Internet connection is available, use an internal clock and set the stratum accordingly (which means lower). If you re using your computer s internal clock, for example, it makes sense to use a low stratum level, such as 5.
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Configuring a Stand-Alone NTP Time Server
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Just two elements are needed to make your own NTP time server: the configuration file and the daemon process. First, make sure that all required software is installed, running apt-get install ntp-server as root. The name of the daemon process is ntpd, and you can start it by using the /etc/init.d/ntpd startup script. After making all proper settings to its configuration file /etc/ntp.conf, you can start the daemon process manually by using /etc/init.d/ntpd start. The content of the NTP configuration file /etc/ntp.conf really doesn t have to be very complex. Basically, you just need three lines to create an NTP time server, as seen in Listing 9-12. Listing 9-12. Example ntp.conf Configuration server 127.127.1.0 fudge 127.127.1.0 stratum 10 server ntp.yourprovider.somewhere The first line in Listing 9-12 specifies what NTP should use if the connection with the NTP time server is lost for a longer period: this line makes sure that the local clock in your server will not drift too much by making a reference to a local clock. Every type of local clock has its own IP address from the range of loopback IP addresses. The format of this address is 127.127.<t>.<i>; the third byte refers to the type of local clock that is used and the fourth byte refers to the instance of the clock your server is connected to. The default address to use to refer to the local computer clock is 127.127.1.0. Notice that all clocks that can be used as an external reference clock connected locally to your server have their own IP address. The documentation of your clock tells you what address to use.
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