Chainguard Container for ntpd-rs

Minimal image with ntpd-rs.

Chainguard Containers are regularly-updated, secure-by-default container images.

Download this Container Image

For those with access, this container image is available on cgr.dev:

docker pull cgr.dev/ORGANIZATION/ntpd-rs:latest

Be sure to replace the ORGANIZATION placeholder with the name used for your organization's private repository within the Chainguard Registry.

Using ntpd-rs

The Chainguard nptd-rs image contains the ntp-daemon server binary.

This binary requires extra capabilities to run (in order to interface with the system time). In Docker, this can be added with --cap-add SYS_TIME.

To run this image, using the public pool.ntp.org server as a peer:

$ docker run --cap-add SYS_TIME cgr.dev/chainguard/ntpd-rs -p pool.ntp.org

2023-04-02T18:50:30.985666Z  WARN ntp_daemon::config: Fewer peers configured than are required to agree on the current time. Daemon will not do anything.
2023-04-02T18:50:31.001470Z  WARN ntp_proto::peer: Peer rejected due to invalid stratum stratum=16
2023-04-02T18:50:31.094893Z  WARN run{config=SystemConfig { min_intersection_survivors: 3, min_cluster_survivors: 3, frequency_tolerance: FrequencyTolerance { ppm: 15 }, distance_threshold: NtpDuration(1000.0000002328306 ms), frequency_measurement_period: NtpDuration(900000.0002095476 ms), spike_threshold: NtpDuration(900000.0002095476 ms), panic_threshold: StepThreshold { forward: Some(NtpDuration(1000000.0002328306 ms)), backward: Some(NtpDuration(1000000.0002328306 ms)) }, startup_panic_threshold: StepThreshold { forward: None, backward: None }, accumulated_threshold: None, local_stratum: 16, poll_limits: PollIntervalLimits { min: PollInterval(16 s), max: PollInterval(1024 s) }, initial_poll: PollInterval(16 s) } local_clock_time=NtpInstant { instant: Instant { tv_sec: 331968, tv_nsec: 938303897 } } system_poll=PollInterval(16 s) peers=[PeerIndex { index: 0 }]}:clock_select{peers=[(PeerIndex { index: 0 }, PeerTimeSnapshot { root_distance_without_time: NtpDuration(8035.252420705569 ms), statistics: PeerStatistics { offset: NtpDuration(47.34621826730347 ms), delay: NtpDuration(93.3494211857555 ms), dispersion: NtpDuration(7937.502728527762 ms), jitter: 3.814697266513178e-6 }, time: NtpInstant { instant: Instant { tv_sec: 331968, tv_nsec: 938270064 } }, stratum: 2, leap_indicator: NoWarning, root_delay: NtpDuration(60.57739259222927 ms), root_dispersion: NtpDuration(20.782470707963796 ms) })]}: ntp_proto::clock_select: No clique of peers that agree on the current time.
2023-04-02T18:50:31.094923Z  INFO ntp_proto::algorithm::standard: filter and combine did not produce a result

What are Chainguard Containers?

Chainguard Containers are minimal container images that are secure by default.

In many cases, the Chainguard Containers tagged as :latest contain only an open-source application and its runtime dependencies. These minimal container images typically do not contain a shell or package manager. Chainguard Containers are built with Wolfi, our Linux undistro designed to produce container images that meet the requirements of a more secure software supply chain.

The main features of Chainguard Containers include:

• Minimal design, without unnecessary software bloat
• Daily builds to ensure container images are up-to-date with available security patches
• High quality build-time SBOMs attesting to the provenance of all artifacts within the image
• Verifiable signatures provided by Sigstore
• Reproducible builds with Cosign and apko (read more about reproducibility)

For cases where you need container images with shells and package managers to build or debug, most Chainguard Containers come paired with a -dev variant.

Although the -dev container image variants have similar security features as their more minimal versions, they feature additional software that is typically not necessary in production environments. We recommend using multi-stage builds to leverage the -dev variants, copying application artifacts into a final minimal container that offers a reduced attack surface that won’t allow package installations or logins.

Learn More

To better understand how to work with Chainguard Containers, please visit Chainguard Academy and Chainguard Courses.

In addition to Containers, Chainguard offers VMs and Libraries. Contact Chainguard to access additional products.

Trademarks

This software listing is packaged by Chainguard. The trademarks set forth in this offering are owned by their respective companies, and use of them does not imply any affiliation, sponsorship, or endorsement by such companies.