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I've spent a lot of time searching, but haven't found any concrete (i.e. something I can give to a customer) details on GCC VM clock synchronization. My RHEL Vm's don't have ntp running, but I found a blog page that said the system clock in a VM is automatically synched - but can't find this in the actual GCC docs.

Is it in fact OK to not run ntp, or should I turn it on? If the answer is it's not needed, is there any place where this is definitively stated?


As mentioned in this article Compute Engine instances are preconfigured to use network time protocol (NTP). Also this article describes that Compute Engine instances are configured to renew DHCP leases every 24 hours.

In GCE Debian VMs, the ntp script can be found at /etc/dhcp/dhclient-exit-hooks.d/ directory and in GCE Red Hat and CentOS VMs script is located at /etc/dhcp/dhclient.d/ . The ntp script runs during DHCP renewal and synchronize time with NTP server:

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