systemd-client 0.1.2

High-level Python client for systemd user services: unit management, journal reading, sync + async

systemd-client

High-level Python client for systemd user services. Async-first with sync wrappers, subprocess + optional D-Bus backends, CLI included.

English Documentation · Documentacion en Espanol

Features

• Async + Sync API — AsyncSystemdClient and SystemdClient with identical interfaces
• Unit management — list, status, start, stop, restart, reload, enable, disable, mask, unmask
• Journal reader — query with filters (unit, priority, time range, grep) and real-time follow
• Pluggable backends — subprocess (default, zero deps) or D-Bus via dasbus
• Typed models — frozen dataclasses with full annotations, optional Pydantic support
• CLI — systemd-client command with table and JSON output
• Modern Python — 3.11+, StrEnum, slots, PEP 561 typed

Install

pip install systemd-client

Optional extras:

pip install systemd-client[dbus]      # D-Bus backend via dasbus
pip install systemd-client[pydantic]  # Pydantic model variants
pip install systemd-client[all]       # Everything

Quick Start

Sync

from systemd_client import SystemdClient

client = SystemdClient()

# List services
for unit in client.list_units(unit_type="service"):
    print(f"{unit.name}: {unit.active_state} ({unit.sub_state})")

# Manage units
client.restart("my-app.service")
status = client.status("my-app.service")
print(f"PID: {status.main_pid}, State: {status.active_state}")

# Journal
entries = client.journal("my-app.service", lines=50, since="1h ago")
for entry in entries:
    print(f"[{entry.priority}] {entry.message}")

# Follow journal in real-time
for entry in client.journal_follow("my-app.service"):
    print(entry.message)

Async

import asyncio
from systemd_client import AsyncSystemdClient

async def main():
    client = AsyncSystemdClient()
    units = await client.list_units(unit_type="service")
    await client.restart("my-app.service")

    async for entry in client.journal_follow("my-app.service"):
        print(entry.message)

asyncio.run(main())

CLI

systemd-client list                                     # List all units
systemd-client list --type service                      # List services only
systemd-client status my-app.service                    # Unit status
systemd-client restart my-app.service                   # Restart
systemd-client journal -u my-app.service -n 50          # Last 50 log lines
systemd-client journal -u my-app.service --follow       # Follow logs
systemd-client --json list                              # JSON output

Architecture

Your Application
    |
    +-- SystemdClient (sync)
    |       |
    +-- AsyncSystemdClient (async)
            |
            +-- SubprocessBackend ---- systemctl --user ----> systemd
            |     (default)
            +-- DBusBackend ---------- D-Bus session bus ---> systemd
            |     (optional, dasbus)
            +-- AsyncJournalReader --- journalctl --user ---> journal

API Reference

Method	Return	Description
list_units(unit_type?, state?)	list[UnitInfo]	List user units
status(unit)	UnitStatus	Detailed status
start(unit)	None	Start unit
stop(unit)	None	Stop unit
restart(unit)	None	Restart unit
reload(unit)	None	Reload unit
enable(unit)	EnableResult	Enable unit
disable(unit)	EnableResult	Disable unit
mask(unit) / unmask(unit)	EnableResult	Mask/unmask
is_active(unit)	bool	Check active
is_enabled(unit)	bool	Check enabled
is_failed(unit)	bool	Check failed
daemon_reload()	None	Reload daemon
journal(unit?, lines?, since?, until?, priority?, grep?)	list[JournalEntry]	Query journal
journal_follow(unit?, lines?, priority?)	Iterator[JournalEntry]	Follow journal

Examples

See the examples/ directory for 15 ready-to-use scripts covering:

• Listing and monitoring services
• Start/stop/restart/enable operations
• Journal queries and real-time follow
• Health checks and failed unit reports
• Async concurrent operations
• Deploy workflows
• Batch operations

Requirements

• Python >= 3.11
• Linux with systemd
• systemctl and journalctl on PATH

License

LGPL-2.1-or-later

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systemd-client · GitHub · PyPI