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Init with dashboards

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YuruC3
2026-09-07 00:06:27 +02:00
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23
Dashboards/README.md Normal file
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# PTP Grafana dashboards
Import each JSON with **Dashboards -> New -> Import** and select your Prometheus datasource.
Included:
- `ptp-grandmaster.json` — MOMI / GNSS-PPS / Chrony / PTP
- `ptp-linux-boundary.json` — WOLF-HUNTER-style Linux boundary clock
- `ptp-linux-client.json` — selectable downstream Linux client
- `ptp-nyater.json` — NYATER Nexus boundary clock
- `ptp-homelab-overview.json` — whole timing-chain overview
The dashboards discover instances from:
- `ptp_linux_node_info{role="grandmaster"}`
- `ptp_linux_node_info{role="boundary"}`
- `ptp_linux_node_info{role="client"}`
- `ptp_nexus_target_info`
Notes:
- The GM dashboard does **not** treat `ptp_gm_present=0` as a fault, because the local clock itself is the GM.
- The WOLF dashboard gives special attention to `ptp_phc2sys_*`, useful for your JBOD boundary-clock PHCs.
- The NYATER dashboard shows slave/passive port state and Delay_Req migration, which makes redundant-link failover visible.
- Packet-rate panels use Grafana's `$__rate_interval`.
- If `PORT_PROPERTIES_NP` is unavailable, Linux port counters may show PTP port identity instead of the friendly interface name.

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Dashboards/ptp-grandmaster.json Normal file
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{
"__inputs": [
{
"name": "DS_PROMETHEUS",
"label": "Prometheus",
"type": "datasource",
"pluginId": "prometheus",
"pluginName": "Prometheus"
}
],
"annotations": {
"list": []
},
"editable": true,
"graphTooltip": 1,
"id": null,
"links": [],
"panels": [
{
"id": 1,
"type": "row",
"title": "Grandmaster health",
"collapsed": false,
"gridPos": {
"x": 0,
"y": 0,
"w": 24,
"h": 1
},
"panels": []
},
{
"id": 2,
"type": "stat",
"title": "PPS selected",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 0,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "red",
"value": null
},
{
"color": "green",
"value": 1
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "max(ptp_gm_chrony_source{instance=\"$instance\",source=\"PPS\",state=\"*\"})",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 3,
"type": "stat",
"title": "PTP services up",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 4,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "red",
"value": null
},
{
"color": "green",
"value": 1
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "min(ptp_service_up{instance=\"$instance\"})",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 4,
"type": "stat",
"title": "Clock class",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 8,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "green",
"value": null
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "ptp_grandmaster_clock_class{instance=\"$instance\"}",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 5,
"type": "stat",
"title": "UTC offset",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 12,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "s",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "green",
"value": null
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "ptp_current_utc_offset_seconds{instance=\"$instance\"}",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 6,
"type": "stat",
"title": "Steps removed",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 16,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "green",
"value": null
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "ptp_steps_removed{instance=\"$instance\"}",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 7,
"type": "stat",
"title": "Exporter scrape",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 20,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "red",
"value": null
},
{
"color": "green",
"value": 1
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "ptp_exporter_scrape_success{instance=\"$instance\",stage=\"ok\"}",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 8,
"type": "row",
"title": "GNSS / Chrony",
"collapsed": false,
"gridPos": {
"x": 0,
"y": 5,
"w": 24,
"h": 1
},
"panels": []
},
{
"id": 9,
"type": "timeseries",
"title": "Chrony offset",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 0,
"y": 6,
"w": 12,
"h": 8
},
"fieldConfig": {
"defaults": {
"unit": "\u00b5s",
"custom": {
"drawStyle": "line",
"lineInterpolation": "linear",
"lineWidth": 1,
"fillOpacity": 10,
"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
"type": "linear"
}
}
},
"overrides": []
},
"options": {
"legend": {
"displayMode": "table",
"placement": "bottom",
"calcs": [
"lastNotNull",
"mean",
"max"
]
},
"tooltip": {
"mode": "multi",
"sort": "desc"
}
},
"targets": [
{
"refId": "A",
"expr": "ptp_gm_chrony_system_time_offset_seconds{instance=\"$instance\"} * 1e6",
"legendFormat": "system",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
},
{
"refId": "B",
"expr": "ptp_gm_chrony_last_offset_seconds{instance=\"$instance\"} * 1e6",
"legendFormat": "last",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
},
{
"refId": "C",
"expr": "ptp_gm_chrony_rms_offset_seconds{instance=\"$instance\"} * 1e6",
"legendFormat": "RMS",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
},
{
"id": 10,
"type": "timeseries",
"title": "Chrony dispersion / delay",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 12,
"y": 6,
"w": 12,
"h": 8
},
"fieldConfig": {
"defaults": {
"unit": "\u00b5s",
"custom": {
"drawStyle": "line",
"lineInterpolation": "linear",
"lineWidth": 1,
"fillOpacity": 10,
"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
"type": "linear"
}
}
},
"overrides": []
},
"options": {
"legend": {
"displayMode": "table",
"placement": "bottom",
"calcs": [
"lastNotNull",
"mean",
"max"
]
},
"tooltip": {
"mode": "multi",
"sort": "desc"
}
},
"targets": [
{
"refId": "A",
"expr": "ptp_gm_chrony_root_dispersion_seconds{instance=\"$instance\"} * 1e6",
"legendFormat": "dispersion",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
},
{
"refId": "B",
"expr": "ptp_gm_chrony_root_delay_seconds{instance=\"$instance\"} * 1e6",
"legendFormat": "root delay",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
},
{
"id": 11,
"type": "timeseries",
"title": "Chrony frequency",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 0,
"y": 14,
"w": 12,
"h": 8
},
"fieldConfig": {
"defaults": {
"unit": "ppm",
"custom": {
"drawStyle": "line",
"lineInterpolation": "linear",
"lineWidth": 1,
"fillOpacity": 10,
"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
"type": "linear"
}
}
},
"overrides": []
},
"options": {
"legend": {
"displayMode": "table",
"placement": "bottom",
"calcs": [
"lastNotNull",
"mean",
"max"
]
},
"tooltip": {
"mode": "multi",
"sort": "desc"
}
},
"targets": [
{
"refId": "A",
"expr": "ptp_gm_chrony_frequency_ppm{instance=\"$instance\"}",
"legendFormat": "frequency",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
},
{
"refId": "B",
"expr": "ptp_gm_chrony_residual_frequency_ppm{instance=\"$instance\"}",
"legendFormat": "residual",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
},
{
"refId": "C",
"expr": "ptp_gm_chrony_skew_ppm{instance=\"$instance\"}",
"legendFormat": "skew",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
},
{
"id": 12,
"type": "timeseries",
"title": "System \u2194 PHC servo",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 12,
"y": 14,
"w": 12,
"h": 8
},
"fieldConfig": {
"defaults": {
"unit": "ns",
"custom": {
"drawStyle": "line",
"lineInterpolation": "linear",
"lineWidth": 1,
"fillOpacity": 10,
"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
"type": "linear"
}
}
},
"overrides": []
},
"options": {
"legend": {
"displayMode": "table",
"placement": "bottom",
"calcs": [
"lastNotNull",
"mean",
"max"
]
},
"tooltip": {
"mode": "multi",
"sort": "desc"
}
},
"targets": [
{
"refId": "A",
"expr": "ptp_phc2sys_offset_nanoseconds{instance=\"$instance\"}",
"legendFormat": "{{clock}}",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
},
{
"id": 13,
"type": "row",
"title": "PTP serving",
"collapsed": false,
"gridPos": {
"x": 0,
"y": 22,
"w": 24,
"h": 1
},
"panels": []
},
{
"id": 14,
"type": "timeseries",
"title": "PTP message rate",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 0,
"y": 23,
"w": 16,
"h": 9
},
"fieldConfig": {
"defaults": {
"unit": "pps",
"custom": {
"drawStyle": "line",
"lineInterpolation": "linear",
"lineWidth": 1,
"fillOpacity": 10,
"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
"type": "linear"
}
}
},
"overrides": []
},
"options": {
"legend": {
"displayMode": "table",
"placement": "bottom",
"calcs": [
"lastNotNull",
"mean",
"max"
]
},
"tooltip": {
"mode": "multi",
"sort": "desc"
}
},
"targets": [
{
"refId": "A",
"expr": "rate(ptp_port_messages_total{instance=\"$instance\",direction=\"tx\",message_type=~\"sync|follow_up|announce|delay_resp\"}[$__rate_interval])",
"legendFormat": "TX {{message_type}}",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
},
{
"refId": "B",
"expr": "rate(ptp_port_messages_total{instance=\"$instance\",direction=\"rx\",message_type=\"delay_req\"}[$__rate_interval])",
"legendFormat": "RX delay_req",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
},
{
"id": 15,
"type": "table",
"title": "PMC dataset health",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 16,
"y": 23,
"w": 8,
"h": 9
},
"fieldConfig": {
"defaults": {},
"overrides": []
},
"options": {
"showHeader": true,
"cellHeight": "sm"
},
"targets": [
{
"refId": "A",
"expr": "ptp_exporter_pmc_dataset_success{instance=\"$instance\"}",
"legendFormat": "{{dataset}} {{error}}",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
}
],
"refresh": "10s",
"schemaVersion": 39,
"tags": [
"ptp",
"67"
],
"templating": {
"list": [
{
"name": "instance",
"label": "Grandmaster",
"type": "query",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"query": "label_values(ptp_linux_node_info{role=\"grandmaster\"}, instance)",
"definition": "label_values(ptp_linux_node_info{role=\"grandmaster\"}, instance)",
"refresh": 1,
"sort": 1,
"multi": false,
"includeAll": false,
"current": {},
"options": []
}
]
},
"time": {
"from": "now-6h",
"to": "now"
},
"timezone": "browser",
"title": "PTP - Grandmaster",
"uid": "ptp-grandmaster",
"version": 1,
"description": "GNSS/PPS, Chrony and PTP health for Grandmaster."
}

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Dashboards/ptp-homelab-overview.json Normal file
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{
"__inputs": [
{
"name": "DS_PROMETHEUS",
"label": "Prometheus",
"type": "datasource",
"pluginId": "prometheus",
"pluginName": "Prometheus"
}
],
"annotations": {
"list": []
},
"editable": true,
"graphTooltip": 1,
"id": null,
"links": [],
"panels": [
{
"id": 1,
"type": "row",
"title": "Timing chain overview",
"collapsed": false,
"gridPos": {
"x": 0,
"y": 0,
"w": 24,
"h": 1
},
"panels": []
},
{
"id": 2,
"type": "stat",
"title": "Grandmaster PPS selected",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 0,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "red",
"value": null
},
{
"color": "green",
"value": 1
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "max(ptp_gm_chrony_source{instance=\"$gm\",source=\"PPS\",state=\"*\"})",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 3,
"type": "stat",
"title": "BorderClock GM present",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 4,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "red",
"value": null
},
{
"color": "green",
"value": 1
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "ptp_gm_present{instance=\"$boundary\"}",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 4,
"type": "stat",
"title": "NEXUS locked",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 8,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "short",
"thresholds": {
"mode": "absolute",
"steps": [
{
"color": "red",
"value": null
},
{
"color": "green",
"value": 1
}
]
},
"color": {
"mode": "thresholds"
}
},
"overrides": []
},
"options": {
"reduceOptions": {
"values": false,
"calcs": [
"lastNotNull"
],
"fields": ""
},
"orientation": "auto",
"textMode": "auto",
"colorMode": "value",
"graphMode": "area",
"justifyMode": "auto"
},
"targets": [
{
"refId": "A",
"expr": "ptp_nexus_clock_locked{instance=\"$nexus\"}",
"legendFormat": "",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 5,
"type": "stat",
"title": "BorderClock offset",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 12,
"y": 1,
"w": 4,
"h": 4
},
"fieldConfig": {
"defaults": {
"unit": "ns",
"thresholds": {
"mode": "absolute",
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"timezone": "browser",
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"uid": "ptp-overview",
"version": 1
}

810
Dashboards/ptp-linux-boundary.json Normal file
View File

@@ -0,0 +1,810 @@
{
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"label": "Prometheus",
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797
Dashboards/ptp-linux-client.json Normal file
View File

@@ -0,0 +1,797 @@
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"version": 1
}

843
Dashboards/ptp-nyater.json Normal file
View File

@@ -0,0 +1,843 @@
{
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"datasource": {
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"targets": [
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"graphMode": "area",
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"datasource": {
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"expr": "ptp_nexus_exporter_scrape_success{instance=\"$instance\",error=\"none\"}",
"legendFormat": "",
"datasource": {
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"uid": "${DS_PROMETHEUS}"
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"instant": true,
"range": false
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{
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"type": "row",
"title": "Servo",
"collapsed": false,
"gridPos": {
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"y": 5,
"w": 24,
"h": 1
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"panels": []
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{
"id": 9,
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"title": "Offset from WOLF-HUNTER",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
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"y": 6,
"w": 12,
"h": 8
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"fieldConfig": {
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"custom": {
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"fillOpacity": 10,
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"overrides": []
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"options": {
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"placement": "bottom",
"calcs": [
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"mean",
"max"
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"sort": "desc"
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"targets": [
{
"refId": "A",
"expr": "ptp_nexus_offset_from_master_nanoseconds{instance=\"$instance\"}",
"legendFormat": "offset",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
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{
"id": 10,
"type": "timeseries",
"title": "Mean path delay",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 12,
"y": 6,
"w": 12,
"h": 8
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"scaleDistribution": {
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"overrides": []
},
"options": {
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"placement": "bottom",
"calcs": [
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"mean",
"max"
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"tooltip": {
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"sort": "desc"
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},
"targets": [
{
"refId": "A",
"expr": "ptp_nexus_mean_path_delay_nanoseconds{instance=\"$instance\"}",
"legendFormat": "delay",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
},
{
"id": 11,
"type": "row",
"title": "Redundant upstream links",
"collapsed": false,
"gridPos": {
"x": 0,
"y": 14,
"w": 24,
"h": 1
},
"panels": []
},
{
"id": 12,
"type": "table",
"title": "Port states",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
"x": 0,
"y": 15,
"w": 8,
"h": 9
},
"fieldConfig": {
"defaults": {},
"overrides": []
},
"options": {
"showHeader": true,
"cellHeight": "sm"
},
"targets": [
{
"refId": "A",
"expr": "ptp_nexus_port_state{instance=\"$instance\"}",
"legendFormat": "{{interface}} {{state}}",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"instant": true,
"range": false
}
]
},
{
"id": 13,
"type": "timeseries",
"title": "Delay Request rate",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
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"y": 15,
"w": 8,
"h": 9
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"fieldConfig": {
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"lineWidth": 1,
"fillOpacity": 10,
"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
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}
}
},
"overrides": []
},
"options": {
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"placement": "bottom",
"calcs": [
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"mean",
"max"
]
},
"tooltip": {
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"sort": "desc"
}
},
"targets": [
{
"refId": "A",
"expr": "rate(ptp_nexus_port_messages_total{instance=\"$instance\",direction=\"tx\",message_type=\"delay_request\"}[$__rate_interval])",
"legendFormat": "{{interface}}",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
},
{
"id": 14,
"type": "timeseries",
"title": "Sync / Announce RX rate",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
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"y": 15,
"w": 8,
"h": 9
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"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
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},
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"options": {
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"placement": "bottom",
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"mean",
"max"
]
},
"tooltip": {
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"sort": "desc"
}
},
"targets": [
{
"refId": "A",
"expr": "rate(ptp_nexus_port_messages_total{instance=\"$instance\",direction=\"rx\",message_type=~\"sync|followup|announce\"}[$__rate_interval])",
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"datasource": {
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"uid": "${DS_PROMETHEUS}"
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{
"id": 15,
"type": "row",
"title": "Metadata",
"collapsed": false,
"gridPos": {
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"y": 24,
"w": 24,
"h": 1
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"panels": []
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{
"id": 16,
"type": "table",
"title": "Parent / Grandmaster",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"gridPos": {
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"y": 25,
"w": 12,
"h": 7
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"cellHeight": "sm"
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"targets": [
{
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"expr": "ptp_nexus_parent_info{instance=\"$instance\"}",
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"uid": "${DS_PROMETHEUS}"
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"instant": true,
"range": false
}
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},
{
"id": 17,
"type": "timeseries",
"title": "Exporter scrape duration",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
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"y": 25,
"w": 12,
"h": 7
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"showPoints": "never",
"spanNulls": false,
"axisPlacement": "auto",
"scaleDistribution": {
"type": "linear"
}
}
},
"overrides": []
},
"options": {
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"displayMode": "table",
"placement": "bottom",
"calcs": [
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"mean",
"max"
]
},
"tooltip": {
"mode": "multi",
"sort": "desc"
}
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"targets": [
{
"refId": "A",
"expr": "ptp_nexus_exporter_scrape_duration_seconds{instance=\"$instance\"}",
"legendFormat": "SSH collection",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
}
}
]
}
],
"refresh": "15s",
"schemaVersion": 39,
"tags": [
"ptp",
"homelab"
],
"templating": {
"list": [
{
"name": "instance",
"label": "Nexus exporter",
"type": "query",
"datasource": {
"type": "prometheus",
"uid": "${DS_PROMETHEUS}"
},
"query": "label_values(ptp_nexus_target_info, instance)",
"definition": "label_values(ptp_nexus_target_info, instance)",
"refresh": 1,
"sort": 1,
"multi": false,
"includeAll": false,
"current": {},
"options": []
}
]
},
"time": {
"from": "now-6h",
"to": "now"
},
"timezone": "browser",
"title": "PTP - NYATER",
"uid": "ptp-nyater",
"version": 1,
"description": "Cisco Nexus boundary-clock dashboard for NYATER."
}

287
RPi5_configs/README.md Normal file
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@@ -0,0 +1,287 @@
# Raspberry Pi 5 — GPS/PPS PTP Grandmaster
This directory contains the files used to turn the Raspberry Pi 5 into the PTP grandmaster for the lab.
The intended time chain is:
```text
GT-U7 GNSS
├─ NMEA over UART ──> gpsd/chrony
└─ PPS on GPIO18 ──> chrony
│
▼
CLOCK_REALTIME (UTC)
│
phc2sys
│
▼
eth0 NIC PHC
│
ptp4l
│
▼
PTP domain 0
```
The Pi therefore has two jobs:
1. discipline the Linux system clock from GNSS/PPS using chrony; and
2. copy that time into the Ethernet PHC and advertise it as the PTP grandmaster.
## Files in this directory
| File | Install/use as | Purpose |
|---|---|---|
| `config.txt` | execute the commands in the file once | Adds the Pi 5 UART and PPS overlays to `/boot/firmware/config.txt` |
| `ptp-gm.conf` | `/etc/linuxptp/ptp4l-gm.conf` | `ptp4l` grandmaster configuration |
| `ptp4l-gm.service` | `/etc/systemd/system/ptp4l-gm.service` | Starts the PTP grandmaster |
| `phc2sys-gm.service` | `/etc/systemd/system/phc2sys-gm.service` | Synchronizes the `eth0` PHC from `CLOCK_REALTIME` |
| `ptp_nic_coalesce.service` | `/etc/systemd/system/ptp_nic_coalesce.service` | Optional NIC interrupt-coalescing tuning |
## 1. Install the required packages
```bash
sudo apt update
sudo apt install gpsd gpsd-clients pps-tools chrony linuxptp ethtool
```
## 2. Configure the Pi UART and PPS input
The `config.txt` file in this directory contains shell commands that append the required settings to the real Raspberry Pi boot configuration.
Back up the boot configuration first:
```bash
sudo cp /boot/firmware/config.txt /boot/firmware/config.txt.pre-ptp
```
Then review and execute the commands from `config.txt`.
The resulting lines in `/boot/firmware/config.txt` should include:
```text
# GPS UART on GPIO14/GPIO15 for Pi 5
dtoverlay=uart0-pi5
init_uart_baud=9600
# GPS PPS on physical pin 12 / GPIO18
dtoverlay=pps-rp1,pin=18,pull-down,schmitt-trigger
```
`pps-rp1` is a separate Pi 5 overlay. Make sure `pps-rp1.dtbo` has already been installed in the appropriate overlays directory before rebooting.
Reboot the Pi:
```bash
sudo reboot
```
After reboot, verify that the UART and PPS device exist:
```bash
ls -l /dev/ttyAMA0 /dev/pps0
sudo ppstest /dev/pps0
```
`ppstest` should report a new PPS assertion once per second.
## 3. Configure gpsd
Configure `/etc/default/gpsd` so gpsd opens both the GT-U7 UART and PPS device:
```bash
START_DAEMON="true"
USBAUTO="true"
DEVICES="/dev/ttyAMA0 /dev/pps0"
GPSD_OPTIONS="-n"
```
Restart and verify gpsd:
```bash
sudo systemctl restart gpsd
systemctl status gpsd
cgps -s
```
## 4. Configure chrony
Chrony disciplines `CLOCK_REALTIME` from the GNSS receiver. NMEA identifies the UTC second and PPS supplies the precise second boundary.
Add the following refclocks to the chrony configuration used by the Pi:
```text
refclock SHM 0 refid NMEA offset 0.0 precision 1e-1 poll 3 noselect
refclock PPS /dev/pps0 refid PPS lock NMEA poll 3
```
If this Pi should continue serving NTP to the lab, keep the required `allow` networks, for example:
```text
allow 192.168.0.0/16
allow 10.0.0.0/8
allow 172.16.0.0/12
```
Also keep:
```text
rtcsync
makestep 1 3
leapseclist /usr/share/zoneinfo/leap-seconds.list
```
Do **not** add `local stratum 1` for the GNSS/PPS setup. A selected local refclock already makes chronyd serve the correct NTP stratum; `local` is a separate fallback/local-reference mode.
Restart chrony and verify that PPS becomes the selected source:
```bash
sudo systemctl restart chrony
chronyc sources -v
chronyc sourcestats
chronyc tracking
```
A healthy setup should show PPS selected (`#* PPS` on common chrony versions).
The NMEA `offset 0.0` in the example is only a starting point. If the serial NMEA sentence latency is large, measure it and adjust the NMEA offset later.
## 5. Verify hardware timestamping on `eth0`
Before enabling PTP, verify the Pi 5 NIC exposes a PHC and hardware TX/RX timestamping:
```bash
ethtool -T eth0
```
You want hardware TX/RX/raw timestamp support and a non-negative `PTP Hardware Clock` number.
You can also identify the PHC with:
```bash
readlink -f /sys/class/net/eth0/device/ptp/ptp*
```
## 6. Install the PTP configuration and services
From this directory, install the files as follows:
```bash
sudo install -D -m 0644 ptp-gm.conf /etc/linuxptp/ptp4l-gm.conf
sudo install -D -m 0644 ptp4l-gm.service /etc/systemd/system/ptp4l-gm.service
sudo install -D -m 0644 phc2sys-gm.service /etc/systemd/system/phc2sys-gm.service
```
The bundled PTP configuration uses:
```text
domainNumber 0
network_transport UDPv4
delay_mechanism E2E
serverOnly 1
clockClass 6
clockAccuracy 0xFE
timeSource 0x20
utc_offset 37
twoStepFlag 1
```
`clockAccuracy 0xFE` is intentionally conservative until actual accuracy has been measured. The `utc_offset` value is the PTP/TAI-to-UTC offset advertised to clients; review it if a future leap second changes the TAI-UTC difference.
Reload systemd and enable the services:
```bash
sudo systemctl daemon-reload
sudo systemctl enable --now ptp4l-gm.service
sudo systemctl enable --now phc2sys-gm.service
```
The direction is important:
```text
chrony: GNSS/PPS -> CLOCK_REALTIME
phc2sys-gm: CLOCK_REALTIME -> eth0 PHC
ptp4l-gm: eth0 PHC -> PTP network
```
## 7. Optional NIC coalescing tuning
`ptp_nic_coalesce.service` applies:
```bash
ethtool -C eth0 tx-usecs 4 rx-usecs 4
```
Treat this as an optional latency/jitter tuning step, not a requirement for PTP to work. First check what the driver supports:
```bash
ethtool -c eth0
```
If the settings are accepted and you want to keep them:
```bash
sudo install -D -m 0644 ptp_nic_coalesce.service /etc/systemd/system/ptp_nic_coalesce.service
sudo systemctl daemon-reload
sudo systemctl enable --now ptp_nic_coalesce.service
```
## 8. Verification
Service state:
```bash
systemctl status chrony
systemctl status ptp4l-gm
systemctl status phc2sys-gm
```
Live logs:
```bash
journalctl -fu ptp4l-gm
journalctl -fu phc2sys-gm
```
Query the local `ptp4l` management socket:
```bash
sudo pmc -u -b 0 'GET PORT_DATA_SET'
sudo pmc -u -b 0 'GET GRANDMASTER_SETTINGS_NP'
sudo pmc -u -b 0 'GET TIME_STATUS_NP'
```
Expected results include:
```text
portState MASTER/SERVER
timeSource 0x20
clockClass 6
clockAccuracy 0xFE
stepsRemoved 0
```
The `grandmasterIdentity` reported here is the identity that should remain visible through WOLF-HUNTER and NYATER.
## 9. Troubleshooting checklist
```bash
# PPS exists and pulses
sudo ppstest /dev/pps0
# GPS data is arriving
cgps -s
# chrony actually selected PPS
chronyc sources -v
chronyc tracking
# eth0 supports hardware PTP
ethtool -T eth0
# PTP services are healthy
journalctl -u ptp4l-gm -n 100 --no-pager
journalctl -u phc2sys-gm -n 100 --no-pager
```
Do not run another service that also tries to discipline the `eth0` PHC. Chrony may continue to discipline `CLOCK_REALTIME`; that is intentional on the grandmaster.