Proxmox Cluster time synchronization problem

[mijamoto]

Hi,

we are using a 3 node Proxmox Cluster where the hosts do not have access to the internet.

Unfortunately, nobody set correct time synchronization during installation. Now we have a problem with time. There is a difference of up to 20 minutes on individual servers.

My question is this. If I now set the time synchronization against the NTP server, can there be any problem in the cluster?

Is there any proper procedure to solve this problem?

 

[Moayad]

Hello,

My question is this. If I now set the time synchronization against the NTP server, can there be any problem in the cluster?

Should work. If the cluster running with PVE 7.x make sure to install/enable the NTP with chrony [0]


[0] https://pve.proxmox.com/pve-docs/pve-admin-guide.html#_time_synchronization

 

[mijamoto]

Hi Moayad,

thank you for your answer. I will follow the instructions and hope everything will be fine.

 

[Ardje]

The best way to handle offline networks is this in /etc/ntp.conf if you are running sntp:

tos orphan 6
peer 192.168.148.64 iburst
peer 192.168.148.65 iburst
peer 192.168.148.66 iburst
peer 192.168.148.67 iburst

where the peers are all your pve nodes.
If it doesn't find a valid ntp server with a stratum less than 6, it will just synchronize with the peers.
The time will be incorrect but the same. Which is the most important thing.

 

[UdoB]

Please note that PVE uses chrony by default (instead of ntpd). This "local-time-servers-list" should probably go to /etc/chrony/sources.d/somelocalservers.sources - you'll find a README there...

Your idea to sync "inside" the cluster sounds good