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Exact time in the FI network

A server can be used to synchronize the exact time of computers time.fi.muni.cz . The server provides the exact time log NTP (or SNTP ) from anywhere on the Internet and protocol time (RFC 868) within the FI network.

This server is part of a distributed network of NTP servers NTP Pool Project , see also monitoring graphs for IPv4 and for IPv6 .

You can also read about our practical experience with NTP operation in the article Accurate time and network transparency our blog.

Unix time synchronization

You must have the NTP daemon running on your computer for accurate synchronization. In many distributions, one very simple part is the default installation: systemd-timesyncd . If you have one and want to use the exact time faculty server, all you need is a configuration file /etc/systemd/timesyncd.conf set in section [Time] line NTP=time.fi.muni.cz and restart the daemon using systemctl restart systemd-timesyncd . Verify that the settings are correct via timedatectl timesync-status : on the first line you should see the name of the currently set server.

You can also install the classic NTP daemon (typically the ntp , No openntpd ). In the configuration file /etc/ntp.conf then set up an NTP faculty server by adding a line server time.fi.muni.cz iburst and commenting lines with directives pool .

The alternative is chrony ( chronyd ). If you are a server time.fi.muni.cz have not already been set during installation, this can be done by commenting out the line with the directive pool in the file /etc/chrony.conf and adding a line server time.fi.muni.cz iburst .

Time synchronization on Windows

In Windows, the command can be used

w32tm /config /manualpeerlist:time.fi.muni.cz /syncfromflags:manual /update

which must be run on the command line with administrator rights.

To check the settings, use

w32tm /query /configuration

Possible problems

See https://support.microsoft.com/en-us/kb/2385818 .