propagation-exporter 0.6.0

Systemd journal reader and exporter

Propagation Exporter

A small tool that watches systemd journal entries from opendnssec-signer.service, parses zone update stats, checks downstream DNS SOA serial propagation, and exposes Prometheus metrics.

Install

This project uses pyproject.toml. Install in your environment of choice.

Run

• As a console script (recommended):

  propagation-exporter -c /etc/coralogix-exporter/zones.yaml --metrics-port 8000

• As a module:

  python -m propagation_exporter -c /etc/coralogix-exporter/zones.yaml

• Legacy script (still supported):

  python main.py -c /etc/coralogix-exporter/zones.yaml

Testing with uv

This project uses uv for Python environment and dependency management in development.

• Install dev deps (once):

  uv sync --extra dev

• Run tests with coverage:

  uv run pytest -q --cov=propagation_exporter --cov-report=term-missing

• Optional: type and style checks:

  uv run mypy propagation_exporter uv run flake8 propagation_exporter

CLI options

• -c, --config-file: YAML with zones and nameservers
• --metrics-port: Prometheus HTTP port (default 8000)
• --zone / --ns: Ad-hoc SOA serial checks without systemd
• --stats-regex: Override the regex used to parse journal "[STATS]" lines.

Regex parsing

By default, the parser extracts zone, serial, and RR count from lines like:

[STATS] example.com 2024072826 RR[count=4 time=0(sec)] ...

Default pattern:

^\[STATS\]\s+(?P<zone>\S+)\s+(?P<serial>\d+)\s+RR\[count=(?P<rr_count>\d+)

You can override it via CLI --stats-regex or programmatically when creating ZoneManager.

Module layout

• propagation_exporter/
  • init.py: public exports
  • main.py: python -m entry
  • cli.py: argument parsing and app wiring
  • journal.py: systemd journal reader
  • zone.py: ZoneInfo, ZoneConfig, ZoneManager, and parsing
  • dns_utils.py: DNSChecker utilities
  • metrics.py: Prometheus metrics

Prometheus metrics

• zone_out_of_sync{zone}
• zone_propagation_delay_seconds{zone, nameserver, serial}

Config file

YAML example:

zones:
	example.com.:
		primary_nameserver: 192.0.2.1
		downstream_nameservers:
			- 192.0.2.2
			- 192.0.2.3

Notes

• Ensure systemd-python, dnspython, PyYAML, and prometheus-client are available in the runtime environment.