Blog of activities for pool of time servers at chrony.eu
2023-10-07: Server load packets/s
Many would like to know what is typical load of one NTP server in cluster. Typical average value is 410 queries per seconds for per cluster member. That sums to around 1640 queries per seconds for whole cluster. As presented in previous post numbers slightly fluctuate across day and week day. Graph on rihgt represent one week of average requests per seconds in roughly 20 minutes interval. It shows time distribution of around 248 million queries during one week time interval.
2023-08-27: Bandwith Increase for cluster
After upgrade to chrony 4.4 we also increased bandwidth on 2023-08-13 for each time server. It took around 10 days to utilize bandwidth to current usage of 224 Kbits/s out of reserved 10Mbit for each time server. As result number of NTP packets increase to 353 packets/s for each time server and on average 1413 requests/s for cluster. We monitor all traffic parameters, details are in table: 
2023-08-10: Upgrade to chrony 4.4.
On 2023-08-09 chrony time server received another upgrade to version 4.4. We upgraded complete chrony.eu cluster with chrony 4.4 from source. Official chrony web page moved to new url which is now: https://chrony-project.org.'
2023-01-12: Upgrade to gpsd 3.25.
On 2023-01-25 gpsd service daemon received another upgrade to version 3.25. We upgraded complete chrony.eu cluster with gpsd 3.25 package compiled from source.
2022-11-01: NTS secured time distribution.
After successfull testing period we upgraded complete chrony.eu cluster with Network Time Security (NTS). The NTS mechanism uses Transport Layer Security (TLS) to establish the keys needed for authentication of NTP packets. Complete protocol definition is specified in: Protocol and Algorithms Specification RFC 5905, Network Time Protocol Version 4 Extension Fields RFC 7822, Message Authentication Code for the Network Time Protocol RFC 8573, Network Time Protocol Version 4 Port Randomization RFC 9109. Certificates are generated with help of letsencrypt servers and updated with certbot client.
