chronyをインストールします。
sudo apt-get install chrony
/etc/chrony/chrony.conf
にある構成ファイルを下記の内容のように編集します。
sudo nano /etc/chrony/chrony.conf
pool time.google.com iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3pool time.facebook.com iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3pool time.euro.apple.com iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3pool time.apple.com iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3pool ntp.ubuntu.com iburst minpoll 2 maxpoll 2 maxsources 3 maxdelay 0.3# This directive specify the location of the file containing ID/key pairs for# NTP authentication.keyfile /etc/chrony/chrony.keys# This directive specify the file into which chronyd will store the rate# information.driftfile /var/lib/chrony/chrony.drift# Uncomment the following line to turn logging on.#log tracking measurements statistics# Log files location.logdir /var/log/chrony# Stop bad estimates upsetting machine clock.maxupdateskew 5.0# This directive enables kernel synchronisation (every 11 minutes) of the# real-time clock. Note that it can’t be used along with the 'rtcfile' directive.rtcsync# Step the system clock instead of slewing it if the adjustment is larger than# one second, but only in the first three clock updates.makestep 0.1 -1# Get TAI-UTC offset and leap seconds from the system tz databaseleapsectz right/UTC# Serve time even if not synchronized to a time source.local stratum 10
設定を有効にするには、Chronyを再起動します。
sudo systemctl restart chronyd.service
同期データのソースを確認します。
chronyc sources
現在のステータスを表示します。
chronyc tracking