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5ec2497fc1
'Servers' should still work but it was changed to 'NTP' quite a while ago... Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
47 lines
1.6 KiB
Plaintext
47 lines
1.6 KiB
Plaintext
Time Synchronization
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--------------------
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ifdef::wiki[]
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:pve-toplevel:
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endif::wiki[]
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The {pve} cluster stack itself relies heavily on the fact that all
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the nodes have precisely synchronized time. Some other components,
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like Ceph, also refuse to work properly if the local time on nodes is
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not in sync.
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Time synchronization between nodes can be achieved with the ``Network
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Time Protocol'' (`NTP`). {pve} uses `systemd-timesyncd` as NTP client
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by default, preconfigured to use a set of public servers. This setup
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works out of the box in most cases.
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Using Custom NTP Servers
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~~~~~~~~~~~~~~~~~~~~~~~~
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In some cases, it might be desired to not use the default NTP
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servers. For example, if your {pve} nodes do not have access to the
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public internet (e.g., because of restrictive firewall rules), you
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need to setup local NTP servers and tell `systemd-timesyncd` to use
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them:
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.File `/etc/systemd/timesyncd.conf`
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----
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[Time]
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NTP=ntp1.example.com ntp2.example.com ntp3.example.com ntp4.example.com
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----
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After restarting the synchronization service (`systemctl restart
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systemd-timesyncd`) you should verify that your newly configured NTP
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servers are used by checking the journal (`journalctl --since -1h -u
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systemd-timesyncd`):
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----
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...
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Oct 07 14:58:36 node1 systemd[1]: Stopping Network Time Synchronization...
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Oct 07 14:58:36 node1 systemd[1]: Starting Network Time Synchronization...
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Oct 07 14:58:36 node1 systemd[1]: Started Network Time Synchronization.
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Oct 07 14:58:36 node1 systemd-timesyncd[13514]: Using NTP server 10.0.0.1:123 (ntp1.example.com).
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Oct 07 14:58:36 nora systemd-timesyncd[13514]: interval/delta/delay/jitter/drift 64s/-0.002s/0.020s/0.000s/-31ppm
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...
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----
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