Dyno System Clock Synchronization
Last updated October 16, 2024
Dynos use the Network Time Protocol (NTP) for time synchronization indirectly via kernel passthrough. We configure the dyno’s underlying host to use time services provided by the Heroku platform’s Stratum 2 NTP servers. These servers sync to a pool of Stratum 1 time servers provided by NIST. Heroku uses the same time servers across its entire fleet to ensure homogeneous and synchronous time regardless of location.