91 lines
2.3 KiB
Markdown
91 lines
2.3 KiB
Markdown
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---
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layout: default
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title: NTP
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parent: Configuration
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nav_order: 9
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---
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# NTP
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Authelia has the ability to check the system time against an NTP server. Currently this only occurs at startup. This
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section configures and tunes the settings for this check which is primarily used to ensure [TOTP](./one-time-password.md)
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can be accurately validated.
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In the instance of inability to contact the NTP server Authelia will just log an error and will continue to run.
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## Configuration
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```yaml
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ntp:
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address: "time.cloudflare.com:123"
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version: 3
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max_desync: 3s
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disable_startup_check: false
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disable_failure: false
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```
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## Options
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### address
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<div markdown="1">
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type: string
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{: .label .label-config .label-purple }
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default: time.cloudflare.com:123
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{: .label .label-config .label-blue }
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required: no
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{: .label .label-config .label-green }
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</div>
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Determines the address of the NTP server to retrieve the time from. The format is `<host>:<port>`, and both of these are
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required.
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### version
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<div markdown="1">
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type: integer
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{: .label .label-config .label-purple }
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default: 4
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{: .label .label-config .label-blue }
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required: no
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{: .label .label-config .label-green }
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</div>
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Determines the NTP verion supported. Valid values are 3 or 4.
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### max_desync
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<div markdown="1">
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type: duration
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{: .label .label-config .label-purple }
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default: 3s
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{: .label .label-config .label-blue }
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required: no
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{: .label .label-config .label-green }
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</div>
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This is used to tune the acceptable desync from the time reported from the NTP server. This uses our
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[duration notation](./index.md#duration-notation-format) format.
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### disable_startup_check
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<div markdown="1">
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type: boolean
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{: .label .label-config .label-purple }
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default: false
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{: .label .label-config .label-blue }
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required: no
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{: .label .label-config .label-green }
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</div>
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Setting this to true will disable the startup check entirely.
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### disable_failure
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<div markdown="1">
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type: boolean
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{: .label .label-config .label-purple }
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default: false
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{: .label .label-config .label-blue }
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required: no
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{: .label .label-config .label-green }
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</div>
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Setting this to true will allow Authelia to start and just log an error instead of exiting. The default is that if
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Authelia can contact the NTP server successfully, and the time reported by the server is greater than what is configured
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in [max_desync](#max_desync) that Authelia fails to start and logs a fatal error.
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