The HTTP Time Protocol (HTP) is used to synchronize a computers time with web servers as reference time source. This program can be used instead of ntpdate or similar in networks that have a firewall blocking the NTP port.
Htpdate will synchronize the computer time to Greenwich Mean Time (GMT), using the timestamps from HTTP headers found in web server responses (the HEAD method will be used to get the information).
Htpdate works through proxy servers. Accuracy of htpdate will be usually within 0.5 seconds (better with multiple servers).
To allow the snap package to adjust the time you need to connect the time-control interface after installation and restart the daemon:
snap connect htpdate-daemon:time-control
. You can set the list of hosts (default: google.com) to query for time via a snap setting like:
snap set htpdate-daemon hosts="google.com www.linux.org"
You can also set additional options for the daemon
snap set htpdate-daemon extra-opts="-d"
It is recommended that you disable your hosts ntp time sync mechanism when using htpdate-daemon.
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Snaps are applications packaged with all their dependencies to run on all popular Linux distributions from a single build. They update automatically and roll back gracefully.
Snaps are discoverable and installable from the Snap Store, an app store with an audience of millions.
Snap can be installed from the command line on openSUSE Leap 15.x and Tumbleweed.
You need first add the snappy repository from the terminal. Choose the appropriate command depending on your installed openSUSE flavor.
Tumbleweed:
sudo zypper addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/openSUSE_Tumbleweed snappy
Leap 15.x:
sudo zypper addrepo --refresh https://download.opensuse.org/repositories/system:/snappy/openSUSE_Leap_15.6 snappy
If needed, Swap out openSUSE_Leap_15. for, openSUSE_Leap_16.0 if you’re using a different version of openSUSE.
With the repository added, import its GPG key:
sudo zypper --gpg-auto-import-keys refresh
Finally, upgrade the package cache to include the new snappy repository:
sudo zypper dup --from snappy
Snap can now be installed with the following:
sudo zypper install snapd
You then need to either reboot, logout/login or source /etc/profile to have /snap/bin added to PATH.
Additionally, enable and start both the snapd and the snapd.apparmor services with the following commands:
sudo systemctl enable --now snapd
sudo systemctl enable --now snapd.apparmor
To install htpdate-daemon, simply use the following command:
sudo snap install htpdate-daemon
Browse and find snaps from the convenience of your desktop using the snap store snap.
Interested to find out more about snaps? Want to publish your own application? Visit snapcraft.io now.