Eucalyptus requires that each machine have the Network Time
Protocol (NTP) daemon started and configured to run
automatically on reboot.
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Install NTP on the machines that will host Eucalyptus
components.
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Open the /etc/ntp.conf file and add NTP servers, if necessary, as in
the following example.
server 0.pool.ntp.org
server 1.pool.ntp.org
server 2.pool.ntp.org
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Save and close the file.
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Synchronize your server.
ntpdate -u YOUR_NTP_SERVER
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Configure NTP to run at reboot.
systemctl enable ntpd.service
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Start NTP.
systemctl start ntpd.service
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Synchronize your system clock, so that when your system is
rebooted, it does not get out of sync.
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Repeat on each host machine that will run a Eucalyptus
service.