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== Configurarea clientului NTP Ubuntu == Clientul NTP din retea va folosi serverul nostru stratum 1 ca sursa principala de timp. Pe Ubuntu, Chrony este usor de configurat si poate inlocui rapid pool‑urile implicite cu serverul nostru local. ==== Instalare Chrony ==== Instalam Chrony pe client pentru a putea sincroniza timpul cu serverul NTP din LAN. <code class="mw-code mw-highlight plainlinks" style="display:block"><!-- --> # apt install chrony </code> ==== Verificare stare initiala ==== Inainte de modificari, clientul foloseste pool‑urile Ubuntu. <code class="mw-code mw-highlight plainlinks" style="display:block"><!-- --> <b># chronyc sources</b>  MS Name/IP address Stratum Poll Reach LastRx Last sample  ===============================================================================  ^- alphyn.canonical.com 2 6 17 34 -4699us[-4699us] +/- 75ms  ^+ prod-ntp-5.ntp4.ps5.cano> 2 6 17 35 -5344us[-3553us] +/- 25ms  ^* prod-ntp-4.ntp4.ps5.cano> 2 6 17 34 -4327us[-2535us] +/- 22ms  ^- prod-ntp-3.ntp4.ps5.cano> 2 6 35 32 -5388us[-5388us] +/- 23ms  ^+ ntp7.kernfusion.at 2 6 17 34 +8539us[ +10ms] +/- 37ms  ^+ time.cloudflare.com 3 6 17 35 +1563us[+3354us] +/- 27ms  ^- time.cloudflare.com 3 6 17 34 +822us[ +822us] +/- 28ms  ^+ ntp7.kernfusion.at 2 6 17 35 +6762us[+8554us] +/- 38ms  <b># chronyc tracking</b>  Reference ID : B97DBE39 (prod-ntp-4.ntp1.ps5.canonical.com)  Stratum : 3  Ref time (UTC) : Wed Feb 25 14:39:49 2026  System time : 0.000061887 seconds slow of NTP time  Last offset : +0.001791766 seconds  RMS offset : 0.001791766 seconds  Frequency : 18.468 ppm fast  Residual freq : -0.238 ppm  Skew : 0.038 ppm  Root delay : 0.043355867 seconds  Root dispersion : 0.000964885 seconds  Update interval : 1.4 seconds  Leap status : Normal </code> ==== Editare configuratie Chrony ==== Pentru ca acest client sa foloseasca serverul nostru NTP din LAN, trebuie sa inlocuim pool‑urile implicite Ubuntu cu adresa serverului local. Configuratia este simpla: comentam sursa initiala si adaugam serverul nostru stratum 1. <code class="mw-code mw-highlight plainlinks" style="display:block"><!-- --> <b># nano /etc/chrony/chrony.conf</b>    #pool ntp.ubuntu.com iburst maxsources 4  #pool 0.ubuntu.pool.ntp.org iburst maxsources 1  #pool 1.ubuntu.pool.ntp.org iburst maxsources 1  #pool 2.ubuntu.pool.ntp.org iburst maxsources 2    server 192.168.1.23 iburst </code> Restartam chrony pentru aplicarea noilor configuratii * service chrony restart ==== Urmarirea sincronizarii ==== Dupa restart, clientul nu se sincronizeaza instant; are nevoie de cateva interogari pentru a valida sursa si a stabili offset‑ul. Folosim <b>watch</b> pentru a vedea in timp real cum trece de la starea initiala, nesincronizata, la sincronizarea completa cu serverul nostru. <code class="mw-code mw-highlight plainlinks" style="display:block"><!-- --> <b># watch -n1 "chronyc sources; echo; chronyc tracking"</b>    MS Name/IP address Stratum Poll Reach LastRx Last sample  ===============================================================================  ^* 192.168.1.23 1 6 17 9 +7517ns[ +21us] +/- 801us    Reference ID : C0A80117 (192.168.1.23)  Stratum : 2  Ref time (UTC) : Wed Feb 25 14:44:20 2026  System time : 0.000000002 seconds slow of NTP time  Last offset : +0.000013356 seconds  RMS offset : 0.000013356 seconds  Frequency : 18.468 ppm fast  Residual freq : -3.156 ppm  Skew : 0.063 ppm  Root delay : 0.000740285 seconds  Root dispersion : 0.000509834 seconds  Update interval : 2.0 seconds  Leap status : Normal </code> În aceasta faza, clientul vede serverul, dar inca nu il foloseste ca sursa activa. Asteptam in acest ecran pana cand apare sincronizarea completa — se vede clar momentul in care clientul „prinde” serverul nostru. <code class="mw-code mw-highlight plainlinks" style="display:block"><!-- --> <b># watch -n1 "chronyc sources; echo; chronyc tracking"</b>    MS Name/IP address Stratum Poll Reach LastRx Last sample  ===============================================================================  ^* 192.168.1.23 1 6 17 41 +7517ns[ +21us] +/- 801us    Reference ID : C0A80117 (192.168.1.23)  Stratum : 2  Ref time (UTC) : Wed Feb 25 14:44:20 2026  System time : 0.000000002 seconds slow of NTP time  Last offset : +0.000013356 seconds  RMS offset : 0.000013356 seconds  Frequency : 18.468 ppm fast  Residual freq : -3.156 ppm  Skew : 0.063 ppm  Root delay : 0.000740285 seconds  Root dispersion : 0.000645164 seconds  Update interval : 2.0 seconds  Leap status : Normal </code> Acum <b>chronyc sources</b> arata serverul stratum 1 ca sursa selectata, iar <b>chronyc tracking</b> confirma ca acest client a devenit stratum 2.
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