{"id":809,"date":"2025-12-31T18:51:27","date_gmt":"2025-12-31T17:51:27","guid":{"rendered":"https:\/\/blog.exterra-services.cz\/?p=809"},"modified":"2026-01-01T22:04:29","modified_gmt":"2026-01-01T21:04:29","slug":"proxmox-ve-a-synchronizace-casu-s-ntp-serverem-chrony","status":"publish","type":"post","link":"https:\/\/blog.exterra-services.cz\/index.php\/2025\/12\/31\/proxmox-ve-a-synchronizace-casu-s-ntp-serverem-chrony\/","title":{"rendered":"Proxmox VE a synchronizace \u010dasu s NTP serverem \u2013 Chrony"},"content":{"rendered":"\n

Existuje je\u0161t\u011b dal\u0161\u00ed zp\u016fsob synchronizace syst\u00e9mov\u00e9ho \u010dasu Proxmox VE hosta s NTP servery a t\u00edm je slu\u017eba chrony<\/a>. Minule jsem popisoval alternativu systemd-timesyncd<\/a>.<\/p>\n\n\n\n

Nejprve zkontrolujte, zdali chrony ji\u017e nen\u00ed instalov\u00e1n:<\/p>\n\n\n\n

root@sr650-ext1:~# systemctl status chrony
Unit chrony.service could not be found.<\/pre>\n\n\n\n
Pokud dostanete v\u00fd\u0161e uveden\u00fd v\u00fdstup, mus\u00edte instalovat:<\/p>\n\n\n\n
root@sr650-ext1:~# apt install chrony
Reading package lists\u2026 Done
Building dependency tree\u2026 Done
Reading state information\u2026 Done
The following packages were automatically installed and are no longer required:
proxmox-kernel-6.8.12-6-pve-signed proxmox-kernel-6.8.12-8-pve-signed
Use 'apt autoremove' to remove them.
Suggested packages:
networkd-dispatcher
The following packages will be REMOVED:
systemd-timesyncd
The following NEW packages will be installed:
chrony
0 upgraded, 1 newly installed, 1 to remove and 7 not upgraded.
Need to get 288 kB of archives.
After this operation, 503 kB of additional disk space will be used.
Do you want to continue? [Y\/n] y
Get:1 http:\/\/ftp.cz.debian.org\/debian bookworm\/main amd64 chrony amd64 4.3-2+deb12u1 [288 kB]
Fetched 288 kB in 1s (252 kB\/s)
(Reading database \u2026 86397 files and directories currently installed.)
Removing systemd-timesyncd (252.39-1~deb12u1) \u2026
Selecting previously unselected package chrony.
(Reading database \u2026 86384 files and directories currently installed.)
Preparing to unpack \u2026\/chrony_4.3-2+deb12u1_amd64.deb \u2026
Unpacking chrony (4.3-2+deb12u1) \u2026
Setting up chrony (4.3-2+deb12u1) \u2026
Processing triggers for dbus (1.14.10-1~deb12u1) \u2026
Processing triggers for man-db (2.11.2-2) \u2026<\/pre>\n\n\n\n
Pokud chrony b\u011b\u017e\u00ed, zkontrolujte logy:<\/p>\n\n\n\n
root@sr650-ext1:~# systemctl status chrony
\u25cf chrony.service – chrony, an NTP client\/server
Loaded: loaded (\/lib\/systemd\/system\/chrony.service; enabled; preset: enabled)
Active: active (running) since Wed 2025-12-31 18:19:35 CET; 57s ago
Docs: man:chronyd(8)
man:chronyc(1)
man:chrony.conf(5)
Process: 2461395 ExecStart=\/usr\/sbin\/chronyd $DAEMON_OPTS (code=exited, status=0\/SUCCESS)
Main PID: 2461398 (chronyd)
Tasks: 2 (limit: 463884)
Memory: 1.4M
CPU: 50ms
CGroup: \/system.slice\/chrony.service
\u251c\u25002461398 \/usr\/sbin\/chronyd -F 1
\u2514\u25002461399 \/usr\/sbin\/chronyd -F 1<\/p>\n\n\n\n
Dec 31 18:19:35 sr650-ext1 systemd[1]: Starting chrony.service - chrony, an NTP client\/server\u2026
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: chronyd version 4.3 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +NTS +SECHASH +IPV6 -DEBUG)
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: Frequency -18.216 +\/- 0.068 ppm read from \/var\/lib\/chrony\/chrony.drift
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: Using right\/UTC timezone to obtain leap second data
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: Loaded seccomp filter (level 1)
Dec 31 18:19:35 sr650-ext1 systemd[1]: Started chrony.service - chrony, an NTP client\/server.
Dec 31 18:19:45 sr650-ext1 chronyd[2461398]: Selected source 81.27.192.20 (2.debian.pool.ntp.org)
Dec 31 18:19:45 sr650-ext1 chronyd[2461398]: System clock TAI offset set to 37 seconds
root@sr650-ext1:~# journalctl -u chrony -f
Dec 31 12:07:04 sr650-ext1 systemd[1]: Stopped chrony.service - chrony, an NTP client\/server.
Dec 31 12:07:04 sr650-ext1 systemd[1]: chrony.service: Consumed 13.877s CPU time.
Dec 31 18:19:35 sr650-ext1 systemd[1]: Starting chrony.service - chrony, an NTP client\/server\u2026
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: chronyd version 4.3 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +NTS +SECHASH +IPV6 -DEBUG)
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: Frequency -18.216 +\/- 0.068 ppm read from \/var\/lib\/chrony\/chrony.drift
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: Using right\/UTC timezone to obtain leap second data
Dec 31 18:19:35 sr650-ext1 chronyd[2461398]: Loaded seccomp filter (level 1)
Dec 31 18:19:35 sr650-ext1 systemd[1]: Started chrony.service - chrony, an NTP client\/server.
Dec 31 18:19:45 sr650-ext1 chronyd[2461398]: Selected source 81.27.192.20 (2.debian.pool.ntp.org)
Dec 31 18:19:45 sr650-ext1 chronyd[2461398]: System clock TAI offset set to 37 seconds<\/pre>\n\n\n\n
Chrony pou\u017e\u00edv\u00e1 jako zdroj \u010dasu n\u011bkter\u00fd p\u0159ednastaven\u00fd timeserver od Debianu. Pokud chcete nasm\u011brovat synchronizaci na vlastn\u00ed timeserver, pak takto:<\/p>\n\n\n\n
# pool 2.debian.pool.ntp.org iburst
server tik.cesnet.cz iburst
server tak.cesnet.cz iburst
<\/pre>\n\n\n\n
Deaktivoval jsem p\u016fvodn\u00ed zdroj \u010dasu a p\u0159idal 2 obl\u00edben\u00e9 timeservery Cesnetu. Restartujte slu\u017ebu chrony a zkontrolujte log:<\/p>\n\n\n\n
root@sr650-ext1:~# systemctl restart chrony
root@sr650-ext1:~# journalctl -u chrony -f
Dec 31 18:43:45 sr650-ext1 chronyd[2461398]: chronyd exiting
Dec 31 18:43:45 sr650-ext1 systemd[1]: Stopping chrony.service - chrony, an NTP client\/server\u2026
Dec 31 18:43:45 sr650-ext1 systemd[1]: chrony.service: Deactivated successfully.
Dec 31 18:43:45 sr650-ext1 systemd[1]: Stopped chrony.service - chrony, an NTP client\/server.
Dec 31 18:43:45 sr650-ext1 systemd[1]: Starting chrony.service - chrony, an NTP client\/server\u2026
Dec 31 18:43:45 sr650-ext1 chronyd[2471193]: chronyd version 4.3 starting (+CMDMON +NTP +REFCLOCK +RTC +PRIVDROP +SCFILTER +SIGND +ASYNCDNS +NTS +SECHASH +IPV6 -DEBUG)
Dec 31 18:43:45 sr650-ext1 chronyd[2471193]: Frequency -18.181 +\/- 0.049 ppm read from \/var\/lib\/chrony\/chrony.drift
Dec 31 18:43:45 sr650-ext1 chronyd[2471193]: Using right\/UTC timezone to obtain leap second data
Dec 31 18:43:45 sr650-ext1 chronyd[2471193]: Loaded seccomp filter (level 1)
Dec 31 18:43:45 sr650-ext1 systemd[1]: Started chrony.service - chrony, an NTP client\/server.
Dec 31 18:43:49 sr650-ext1 chronyd[2471193]: Selected source 195.113.144.201 (tik.cesnet.cz)
Dec 31 18:43:49 sr650-ext1 chronyd[2471193]: System clock TAI offset set to 37 seconds
Dec 31 18:43:51 sr650-ext1 chronyd[2471193]: Selected source 195.113.144.238 (tak.cesnet.cz)<\/pre>\n\n\n\n
Z logu je vid\u011bt, \u017ee chrony nyn\u00ed \u010derp\u00e1 data ze server\u016f Cesnetu.<\/p>\n","protected":false},"excerpt":{"rendered":"
Existuje je\u0161t\u011b dal\u0161\u00ed zp\u016fsob synchronizace syst\u00e9mov\u00e9ho \u010dasu Proxmox VE hosta s NTP servery a t\u00edm je slu\u017eba chrony. Minule jsem popisoval alternativu systemd-timesyncd. Nejprve zkontrolujte, zdali chrony ji\u017e nen\u00ed instalov\u00e1n: root@sr650-ext1:~# systemctl status chronyUnit chrony.service could not be found. Pokud dostanete v\u00fd\u0161e uveden\u00fd v\u00fdstup, mus\u00edte instalovat: root@sr650-ext1:~# apt install chronyReading package lists\u2026 DoneBuilding dependency tree\u2026 […]<\/p>\n","protected":false},"author":1,"featured_media":818,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"","ocean_second_sidebar":"","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"","ocean_custom_header_template":"","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"","ocean_menu_typo_font_family":"","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"on","ocean_gallery_id":[],"footnotes":""},"categories":[5],"tags":[],"class_list":["post-809","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-technologie","entry","has-media"],"yoast_head":"\nProxmox VE a synchronizace \u010dasu s NTP serverem \u2013 Chrony | Coffeespot<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blog.exterra-services.cz\/index.php\/2025\/12\/31\/proxmox-ve-a-synchronizace-casu-s-ntp-serverem-chrony\/\" \/>\n<meta property=\"og:locale\" content=\"cs_CZ\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Proxmox VE a synchronizace \u010dasu s NTP serverem \u2013 Chrony | Coffeespot\" \/>\n<meta property=\"og:description\" content=\"Existuje je\u0161t\u011b dal\u0161\u00ed zp\u016fsob synchronizace syst\u00e9mov\u00e9ho \u010dasu Proxmox VE hosta s NTP servery a t\u00edm je slu\u017eba chrony. Minule jsem popisoval alternativu systemd-timesyncd. Nejprve zkontrolujte, zdali chrony ji\u017e nen\u00ed instalov\u00e1n: root@sr650-ext1:~# systemctl status chronyUnit chrony.service could not be found. Pokud dostanete v\u00fd\u0161e uveden\u00fd v\u00fdstup, mus\u00edte instalovat: root@sr650-ext1:~# apt install chronyReading package lists\u2026 DoneBuilding dependency tree\u2026 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blog.exterra-services.cz\/index.php\/2025\/12\/31\/proxmox-ve-a-synchronizace-casu-s-ntp-serverem-chrony\/\" \/>\n<meta property=\"og:site_name\" content=\"Coffeespot\" \/>\n<meta property=\"article:published_time\" content=\"2025-12-31T17:51:27+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-01-01T21:04:29+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blog.exterra-services.cz\/wp-content\/uploads\/2025\/12\/PVE-chrony.png\" \/>\n\t<meta property=\"og:image:width\" content=\"446\" \/>\n\t<meta property=\"og:image:height\" content=\"206\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Petr \u0160antr\u016f\u010dek\" \/>\n<meta name=\"twitter:card\" 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Minule jsem popisoval alternativu systemd-timesyncd. Nejprve zkontrolujte, zdali chrony ji\u017e nen\u00ed instalov\u00e1n: root@sr650-ext1:~# systemctl status chronyUnit chrony.service could not be found. Pokud dostanete v\u00fd\u0161e uveden\u00fd v\u00fdstup, mus\u00edte instalovat: root@sr650-ext1:~# apt install chronyReading package lists\u2026 DoneBuilding dependency tree\u2026 […]","og_url":"https:\/\/blog.exterra-services.cz\/index.php\/2025\/12\/31\/proxmox-ve-a-synchronizace-casu-s-ntp-serverem-chrony\/","og_site_name":"Coffeespot","article_published_time":"2025-12-31T17:51:27+00:00","article_modified_time":"2026-01-01T21:04:29+00:00","og_image":[{"width":446,"height":206,"url":"https:\/\/blog.exterra-services.cz\/wp-content\/uploads\/2025\/12\/PVE-chrony.png","type":"image\/png"}],"author":"Petr \u0160antr\u016f\u010dek","twitter_card":"summary_large_image","twitter_misc":{"Napsal(a)":"Petr \u0160antr\u016f\u010dek","Odhadovan\u00e1 doba \u010dten\u00ed":"2 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