How to ensure a systemd unit waits for chronyd or ntpd to sync before starting

Solution Verified - Updated -

Issue

  • We have a service that starts at boot
    We need to ensure it doesn't start until the system clock has been synchronized via ntp
    Some machines are using ntpd; some chronyd
    How do we do this? Furthermore, is it better to use ntpd or chronyd?

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8
  • Red Hat Enterprise Linux 9

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In

New to Red Hat?

Learn more about Red Hat subscriptions

Using a Red Hat product through a public cloud?

How to access this content