Configure NTP

Eucalyptus requires that each machine have the Network Time Protocol (NTP) daemon started and configured to run automatically on reboot.

To use NTP:

  1. Install NTP on the machines that will host Eucalyptus components.
    yum install ntp
  2. Open the /etc/ntp.conf file and add NTP servers, if necessary, as in the following example.
  3. Save and close the file.
  4. Synchronize your server.
    ntpdate -u YOUR_NTP_SERVER
  5. Configure NTP to run at reboot.
    systemctl enable ntpd.service
  6. Start NTP.
    systemctl start ntpd.service
  7. Synchronize your system clock, so that when your system is rebooted, it does not get out of sync.
    hwclock --systohc
  8. Repeat on each host machine that will run a Eucalyptus service.