61 lines
2.3 KiB
Markdown
61 lines
2.3 KiB
Markdown
# ntpq Input Plugin
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Get standard NTP query metrics, requires ntpq executable.
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Below is the documentation of the various headers returned from the NTP query
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command when running `ntpq -p`.
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- remote – The remote peer or server being synced to. “LOCAL” is this local host
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(included in case there are no remote peers or servers available);
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- refid – Where or what the remote peer or server is itself synchronised to;
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- st (stratum) – The remote peer or server Stratum
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- t (type) – Type (u: unicast or manycast client, b: broadcast or multicast client,
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l: local reference clock, s: symmetric peer, A: manycast server,
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B: broadcast server, M: multicast server, see “Automatic Server Discovery“);
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- when – When last polled (seconds ago, “h” hours ago, or “d” days ago);
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- poll – Polling frequency: rfc5905 suggests this ranges in NTPv4 from 4 (16s)
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to 17 (36h) (log2 seconds), however observation suggests the actual displayed
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value is seconds for a much smaller range of 64 (26) to 1024 (210) seconds;
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- reach – An 8-bit left-shift shift register value recording polls (bit set =
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successful, bit reset = fail) displayed in octal;
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- delay – Round trip communication delay to the remote peer or server (milliseconds);
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- offset – Mean offset (phase) in the times reported between this local host and
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the remote peer or server (RMS, milliseconds);
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- jitter – Mean deviation (jitter) in the time reported for that remote peer or
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server (RMS of difference of multiple time samples, milliseconds);
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### Configuration:
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```toml
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# Get standard NTP query metrics, requires ntpq executable
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[[inputs.ntpq]]
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## If false, set the -n ntpq flag. Can reduce metric gather times.
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dns_lookup = true
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```
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### Measurements & Fields:
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- ntpq
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- delay (float, milliseconds)
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- jitter (float, milliseconds)
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- offset (float, milliseconds)
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- poll (int, seconds)
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- reach (int)
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- when (int, seconds)
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### Tags:
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- All measurements have the following tags:
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- refid
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- remote
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- type
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- stratum
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### Example Output:
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```
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$ telegraf --config ~/ws/telegraf.conf --input-filter ntpq --test
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* Plugin: ntpq, Collection 1
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> ntpq,refid=.GPSs.,remote=*time.apple.com,stratum=1,type=u delay=91.797,jitter=3.735,offset=12.841,poll=64i,reach=377i,when=35i 1457960478909556134
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```
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