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NTP synchronization

The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems. Time synchronization is important to Kubernetes and Etcd.

Enable the NTP

To start the ntpd(or chrony) service and enable it at system boot. There are related specific variables:

ntp_enabled: true

The NTP service would be enabled and sync time automatically.

Customize the NTP configure file

In the Air-Gap environment, the node cannot access the NTP server by internet. So the node can use the customized ntp server by configuring ntp file.

ntp_enabled: true
ntp_manage_config: true
ntp_servers:
  - "0.your-ntp-server.org iburst"
  - "1.your-ntp-server.org iburst"
  - "2.your-ntp-server.org iburst"
  - "3.your-ntp-server.org iburst"

Setting the TimeZone

The timezone can also be set by the ntp_timezone , eg: "Etc/UTC","Asia/Shanghai". If not set, the timezone will not change.

ntp_enabled: true
ntp_timezone: Etc/UTC

Advanced Configure

Enable tinker panic is useful when running NTP in a VM environment to avoiding clock drift on VMs. It only takes effect when ntp_manage_config is true.

ntp_tinker_panic: true

Force sync time immediately by NTP after the ntp installed, which is useful in newly installed system.

ntp_force_sync_immediately: true

When using Ubuntu 24.04 or a distribution that already has systemd-timesyncd installed, use the ntpsec package.

ntp_package: ntpsec