51 lines
1.4 KiB
Markdown
51 lines
1.4 KiB
Markdown
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# NTP synchronization
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The Network Time Protocol (NTP) is a networking protocol for clock synchronization between computer systems. Time synchronization is important to Kubernetes and Etcd.
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## Enable the NTP
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To start the ntpd(or chrony) service and enable it at system boot. There are related specific variables:
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```ShellSession
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ntp_enabled: true
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```
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The NTP service would be enabled and sync time automatically.
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## Customize the NTP configure file
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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.
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```ShellSession
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ntp_enabled: true
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ntp_manage_config: true
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ntp_servers:
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- "0.your-ntp-server.org iburst"
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- "1.your-ntp-server.org iburst"
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- "2.your-ntp-server.org iburst"
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- "3.your-ntp-server.org iburst"
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```
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## Setting the TimeZone
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The timezone can also be set by the `ntp_timezone` , eg: "Etc/UTC","Asia/Shanghai". If not set, the timezone will not change.
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```ShellSession
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ntp_enabled: true
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ntp_timezone: Etc/UTC
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```
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## Advanced Configure
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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.
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```ShellSession
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ntp_tinker_panic: true
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```
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Force sync time immediately by NTP after the ntp installed, which is useful in newly installed system.
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```ShellSession
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ntp_force_sync_immediately: true
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```
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