Chrony

Chrony server based on Alpine Linux.

Quick reference

• Where to file issues: Gitea

• Supported architectures: amd64 , armv7 , arm64v8

How to run

With docker run

docker run -di --network host -e ALLOW_CIDR=0.0.0.0/0 rardcode/chrony

With docker-compose file

services:
  app:
    image: rardcode/chrony
    container_name: chrony
    environment:
      - ALLOW_CIDR=0.0.0.0/0 # clients to connect and get the time. Default is none.
      #- NTP_SERVER=time.inrim.it # The NTP server to get the time to set from. Default is pool.ntp.org.
      #- SYNC_RTC=false # Sync the realtime clock on the machine/instance the service is running. Default is true.
    network_mode: host # Recommended so that clients come with the real ip, otherwise they would all get with only ip, that of the docker
    cap_add:
      - SYS_TIME
    restart: unless-stopped

Useful commands:

docker exec chrony /bin/sh -c "chronyc clients"
docker exec chrony /bin/sh -c "chronyc sources"

Changelog

v3232.48r1 - 02.01.2026

• Alpine v. 3.23.2
• Chrony v. 4.8-r1