1. Release Notes for Oracle Linux 9.4
  2. New Features and Changes
  3. Infrastructure Services

Infrastructure Services

The following features, enhancements, and changes related to infrastructure services are introduced in this Oracle Linux 9 release.

chrony Updated to Version 4.5

The chrony packages are updated to version 4.5. Notable changes include:

  • Added the AES-GCM-SIV cipher to shorten Network Time Security (NTS) cookies to avoid some length-specific blocking of Network Time Protocol (NTP).

  • Improved automatic NTP source replacement for unreachable NTP sources.

  • Logging of important changes made by command requests using the chronyc command.

  • Periodic refreshes of NTP sources. The default refresh period is two weeks. You can disable refreshes by adding the refresh 0 configuration entry in the chrony.conf file.

  • Improved logging of source selection failures and falsetickers.

  • Added the hwtstimeout directive to configure timeout for late hardware transmit timestamps.

  • Added the chronyd-restricted service as an optional service for minimal client-only configurations so that the chronyd service can be started without root privileges.

  • Fixed the presend option in interleaved mode.

  • Fixed reloading of modified sources from the sourcedir directories.

linuxptp Updated to Version 4.2

linuxptp is an implementation of the Precision Time Protocol (PTP). The linuxptp package is updated to version 4.2 to include the following notable changes:

  • Multiple domain capability in the phc2sys tool.

  • Clock update and change notifications in the Precision Time Protocol (PTP) parent dataset.

  • Addition of the PTP Power Profile (IEEE C37.238-2011 and IEEE C37.238-2017).