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Cette page explique comment configurer une relecture NTP externe pour l'appliance Google Distributed Cloud (GDC) isolée.
Ces étapes ne sont nécessaires que si vous souhaitez synchroniser l'appliance avec une heure externe après l'avoir déconnectée.
Avant de commencer
Pour synchroniser l'appliance avec un serveur NTP externe, procédez comme suit :
Avant de commencer, assurez-vous qu'il n'y a qu'un seul relais NTP. Pour le vérifier, exécutez la commande suivante sur la machine du programme d'amorçage :
kubectlgetntprelay-A
Le résultat ressemble à l'exemple suivant :
NAMESPACENAMEAGE
gpc-systembi-ntp-relay4d21h
Configurer le relais NTP
Connectez le programme d'amorçage à l'appliance et déterminez l'adresse IP de l'interface connectée :
Sauf indication contraire, le contenu de cette page est régi par une licence Creative Commons Attribution 4.0, et les échantillons de code sont régis par une licence Apache 2.0. Pour en savoir plus, consultez les Règles du site Google Developers. Java est une marque déposée d'Oracle et/ou de ses sociétés affiliées.
Dernière mise à jour le 2025/09/04 (UTC).
[[["Facile à comprendre","easyToUnderstand","thumb-up"],["J'ai pu résoudre mon problème","solvedMyProblem","thumb-up"],["Autre","otherUp","thumb-up"]],[["Difficile à comprendre","hardToUnderstand","thumb-down"],["Informations ou exemple de code incorrects","incorrectInformationOrSampleCode","thumb-down"],["Il n'y a pas l'information/les exemples dont j'ai besoin","missingTheInformationSamplesINeed","thumb-down"],["Problème de traduction","translationIssue","thumb-down"],["Autre","otherDown","thumb-down"]],["Dernière mise à jour le 2025/09/04 (UTC)."],[],[],null,["# Configure an external NTP relay\n\nThis page describes how to configure an external NTP replay for\nGoogle Distributed Cloud (GDC) air-gapped appliance.\n\nThese steps are only required if you want to synchronize the appliance\nwith external time after being disconnected.\n\n### Before you begin\n\nTo sync the appliance with external NTP, complete the following steps:\n\n1. Before you begin, make sure that there is only one NTP relay. To verify, run\n the following command on the bootstrapper machine:\n\n kubectl get ntprelay -A\n\n The output looks like the following example: \n\n NAMESPACE NAME AGE\n gpc-system bi-ntp-relay 4d21h\n\nConfigure the NTP relay\n-----------------------\n\n1. Connect the bootstrapper to the appliance device and determine the IP\n address of the connected interface:\n\n ifconfig\n mgmt: flags=4163\u003cUP,BROADCAST,RUNNING,MULTICAST\u003e mtu 1500\n inet 198.18.0.30 netmask 255.255.255.224 broadcast 198.18.0.31\n inet6 fe80::20c:29ff:fea8:fc35 prefixlen 64 scopeid 0x20<link>\n ...\n\n2. Edit the `ntprelay` CR by including the bootstrapper mgmt IP as the upstream IP.\n\n kubectl edit ntprelay bi-ntp-relay -n gpc-system\n ntprelay.system.private.gdc.goog/bi-ntp-relay edited\n kubectl get ntprelay bi-ntp-relay -n gpc-system -oyaml\n\n The output looks like the following example. In this example the IP address\n for `upstreamServers` is changed: \n\n apiVersion: system.private.gdc.goog/v1alpha1\n kind: NTPRelay\n metadata:\n creationTimestamp: \"2025-05-16T08:44:21Z\"\n generation: 2\n name: bi-ntp-relay\n namespace: gpc-system\n resourceVersion: \"10871409\"\n uid: 6cde8e65-791c-4bc6-9a8b-d5c9bf103f8b\n spec:\n upstreamServers:\n - 192.0.2.030\n\n3. Verify the NTP synchronization:\n\n **Note:** Wait about three minutes before running the following command as chrony takes some time for the first sync and adjust. Check that the IP address added in the previous step starts with \\^\\*. Verify that the adjusted offset (+286ns in the first output) is the amount of difference between the time of the appliance and the external time source. \n\n kubectl get pods -l app.kubernetes.io/name=ntp -n ntp-system -o name | xargs -I {} kubectl exec {} -n ntp-system -- chronyc sources -v; echo\n\n The output looks like the following: \n\n .-- Source mode '^' = server, '=' = peer, '#' = local clock.\n / .- Source state '*' = current best, '+' = combined, '-' = not combined,\n | / 'x' = may be in error, '~' = too variable, '?' = unusable.\n || .- xxxx [ yyyy ] +/- zzzz\n || Reachability register (octal) -. | xxxx = adjusted offset,\n || Log2(Polling interval) --. | | yyyy = measured offset,\n || \\ | | zzzz = estimated error.\n || | | \\\n MS Name/IP address Stratum Poll Reach LastRx Last sample\n ===============================================================================\n \\^\\* 192.0.2.026 1 6 17 43 +286ns\\[ +36us\\] +/- 1160us\n =? 192.0.2.029 0 6 0 - +0ns[ +0ns] +/- 0ns\n =? 192.0.2.051 0 6 0 - +0ns[ +0ns] +/- 0ns\n =? 192.0.2.059 0 6 0 - +0ns[ +0ns] +/- 0ns\n\n .-- Source mode '^' = server, '=' = peer, '#' = local clock.\n / .- Source state '*' = current best, '+' = combined, '-' = not combined,\n | / 'x' = may be in error, '~' = too variable, '?' = unusable.\n || .- xxxx [ yyyy ] +/- zzzz\n || Reachability register (octal) -. | xxxx = adjusted offset,\n || Log2(Polling interval) --. | | yyyy = measured offset,\n || \\ | | zzzz = estimated error.\n || | | \\\n MS Name/IP address Stratum Poll Reach LastRx Last sample\n ===============================================================================\n \\^\\* 192.0.2.026 1 6 37 2 +2ns\\[ +90us\\] +/- 84us\n =? 192.0.2.029 2 6 1 8 +368us[ +449us] +/- 3761us\n =? 192.0.2.051 0 6 1 - +0ns[ +0ns] +/- 0ns\n =? 192.0.2.059 2 6 1 8 +663us[ +744us] +/- 11ms\n\n .-- Source mode '^' = server, '=' = peer, '#' = local clock.\n / .- Source state '*' = current best, '+' = combined, '-' = not combined,\n | / 'x' = may be in error, '~' = too variable, '?' = unusable.\n || .- xxxx [ yyyy ] +/- zzzz\n || Reachability register (octal) -. | xxxx = adjusted offset,\n || Log2(Polling interval) --. | | yyyy = measured offset,\n || \\ | | zzzz = estimated error.\n || | | \\\n MS Name/IP address Stratum Poll Reach LastRx Last sample\n ===============================================================================\n \\^\\* 192.0.2.026 1 6 37 29 -6ns\\[ -759us\\] +/- 92us\n =? 192.0.2.029 2 6 1 36 +334us[ -346us] +/- 3775us\n =? 192.0.2.051 2 6 1 35 -125us[ -813us] +/- 5839us\n =? 192.0.2.059 0 6 1 - +0ns[ +0ns] +/- 0ns\n\n4. Verify if the `chronyc` in the NTP pods refers to the newly added IP.\n\n kubectl exec -it -n ntp-system ntp2-84ddf7cd99-96vqn -- sh\n\n The output looks like the following example: \n\n Defaulted container \"ntp-image\" out of: ntp-image, ntp-node-exporter\n # chronyc tracking\n Reference ID : C612001E (198.18.0.30)\n Stratum : 2\n Ref time (UTC) : Wed May 21 07:28:38 2025\n System time : 0.000000005 seconds slow of NTP time\n Last offset : +0.000025645 seconds\n RMS offset : 0.000082131 seconds\n Frequency : 15.671 ppm slow\n Residual freq : +0.024 ppm\n Skew : 0.628 ppm\n Root delay : 0.000164273 seconds\n Root dispersion : 0.000180630 seconds\n Update interval : 64.8 seconds\n Leap status : Normal\n # exit"]]
