$ sudo yum -y install ntp || true $ sudo apt-get --assume-yes install ntp || true sudo sed -i '/^server/d' /etc/ntp.conf sudo tee -a /etc/ntp.conf \<\< EOF server time1.google.com iburst server time2.google.com iburst server time3.google.com iburst server time4.google.com iburst EOF sudo systemctl restart ntp &\> /dev/null || true sudo systemctl restart ntpd &\> /dev/null || true sudo service ntp restart &\> /dev/null || true sudo service ntpd restart &\> /dev/null || true sudo restart ntp &\> /dev/null || true sudo restart ntpd &\> /dev/null || true ntpq -p