Add node_exporter_manager.py
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commit
e6b1becca1
239
node_exporter_manager.py
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239
node_exporter_manager.py
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#!/usr/bin/env python3
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import os
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import sys
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import subprocess
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import requests
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import tarfile
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import shutil
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import logging
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import pwd
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from pathlib import Path
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# Stałe ścieżki i konfiguracja
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BIN_TARGET = '/usr/local/bin/node_exporter'
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SERVICE_FILE = '/etc/systemd/system/node_exporter.service'
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LOG_FILE = '/var/log/node_exporter_installer.log'
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USER_NAME = 'node_exporter'
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USER_HOME = '/var/lib/node_exporter'
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# Konfiguracja logowania
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logging.basicConfig(
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filename=LOG_FILE,
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level=logging.INFO,
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format='%(asctime)s [%(levelname)s] %(message)s'
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)
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# ----------------- FUNKCJE POMOCNICZE -----------------
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def run_cmd(cmd, check=True):
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try:
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result = subprocess.run(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, check=check, text=True)
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return result.stdout.strip()
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except subprocess.CalledProcessError as e:
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logging.error(f"Błąd komendy: {cmd} — {e.stderr}")
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raise
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def get_latest_version():
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try:
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r = requests.get('https://api.github.com/repos/prometheus/node_exporter/releases/latest', timeout=10)
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r.raise_for_status()
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return r.json()['tag_name'].lstrip('v'), r.json()
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except requests.RequestException as e:
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logging.error(f"Błąd pobierania wersji z GitHub: {e}")
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raise
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def get_local_version():
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if Path(BIN_TARGET).exists():
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try:
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output = run_cmd([BIN_TARGET, '--version'])
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for line in output.splitlines():
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if "version" in line:
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parts = line.split()
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if len(parts) >= 3:
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return parts[2]
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except Exception as e:
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logging.warning(f"Nie udało się odczytać wersji lokalnej: {e}")
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return None
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def download_and_extract(url, download_path='/tmp'):
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filename = os.path.join(download_path, url.split('/')[-1])
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try:
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with requests.get(url, stream=True, timeout=30) as r:
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r.raise_for_status()
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with open(filename, 'wb') as f:
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for chunk in r.iter_content(chunk_size=8192):
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f.write(chunk)
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except requests.RequestException as e:
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logging.error(f"Błąd pobierania pliku: {e}")
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raise
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with tarfile.open(filename) as tar:
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tar.extractall(path=download_path, filter='data')
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return next(Path(download_path).glob('node_exporter-*'))
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# ----------------- INSTALACJA I KONFIGURACJA -----------------
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def install_binary(extracted_dir):
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src = Path(extracted_dir) / 'node_exporter'
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if Path(BIN_TARGET).exists():
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shutil.copy(BIN_TARGET, BIN_TARGET + '.bak')
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logging.info("Backup binarki zrobiony jako node_exporter.bak")
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shutil.copy(src, BIN_TARGET)
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os.chmod(BIN_TARGET, 0o755)
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logging.info("Zainstalowano binarkę do /usr/local/bin")
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def create_user():
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try:
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pwd.getpwnam(USER_NAME)
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logging.info("Użytkownik node_exporter już istnieje.")
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except KeyError:
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run_cmd(['useradd', '--system', '--home', USER_HOME, '--shell', '/bin/false', USER_NAME])
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logging.info("Utworzono użytkownika node_exporter")
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home_path = Path(USER_HOME)
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home_path.mkdir(parents=True, exist_ok=True)
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shutil.chown(home_path, user=USER_NAME, group=USER_NAME)
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logging.info(f"Utworzono katalog {USER_HOME} i przypisano właściciela.")
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def setup_service():
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service_content = f"""[Unit]
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Description=Node Exporter
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Wants=network-online.target
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After=network-online.target
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[Service]
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User={USER_NAME}
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Group={USER_NAME}
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WorkingDirectory={USER_HOME}
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ExecStart={BIN_TARGET}
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Restart=on-failure
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[Install]
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WantedBy=default.target
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"""
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with open(SERVICE_FILE, 'w') as f:
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f.write(service_content)
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logging.info("Zapisano konfigurację usługi systemd")
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run_cmd(['systemctl', 'daemon-reload'])
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run_cmd(['systemctl', 'enable', '--now', 'node_exporter'])
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logging.info("Włączono i uruchomiono usługę node_exporter")
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def uninstall():
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if Path(SERVICE_FILE).exists():
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run_cmd(['systemctl', 'disable', '--now', 'node_exporter'])
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os.remove(SERVICE_FILE)
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logging.info("Usunięto plik usługi i zatrzymano node_exporter")
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if Path(BIN_TARGET).exists():
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os.remove(BIN_TARGET)
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logging.info("Usunięto binarkę node_exporter")
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try:
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pwd.getpwnam(USER_NAME)
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run_cmd(['userdel', USER_NAME])
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logging.info("Usunięto użytkownika node_exporter")
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except KeyError:
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logging.info("Użytkownik już nie istnieje")
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if Path(USER_HOME).exists():
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shutil.rmtree(USER_HOME)
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logging.info("Usunięto katalog /var/lib/node_exporter")
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def install():
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if Path(BIN_TARGET).exists():
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print("Node Exporter już zainstalowany. Użyj --update.")
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return
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version, release = get_latest_version()
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url = next(asset['browser_download_url'] for asset in release['assets'] if 'linux-amd64.tar.gz' in asset['browser_download_url'])
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extracted = download_and_extract(url)
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install_binary(extracted)
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create_user()
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setup_service()
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logging.info("Instalacja zakończona")
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def update():
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local_version = get_local_version()
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latest_version, release = get_latest_version()
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if local_version == latest_version:
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print(f"Node Exporter już aktualny ({local_version})")
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return
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print(f"Aktualizacja z {local_version} do {latest_version}...")
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run_cmd(['systemctl', 'stop', 'node_exporter'])
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url = next(asset['browser_download_url'] for asset in release['assets'] if 'linux-amd64.tar.gz' in asset['browser_download_url'])
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extracted = download_and_extract(url)
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install_binary(extracted)
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run_cmd(['systemctl', 'start', 'node_exporter'])
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logging.info(f"Zaktualizowano Node Exporter do wersji {latest_version}")
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def setup():
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source_path = Path(__file__).resolve()
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target_path = Path('/usr/local/bin/node_exporter_manager.py')
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if source_path == target_path:
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print("ℹ️ Skrypt już działa z docelowej lokalizacji.")
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elif not target_path.exists():
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shutil.copy(source_path, target_path)
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target_path.chmod(0o755)
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logging.info(f"Zainstalowano skrypt jako {target_path}")
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print(f"✅ Skrypt zainstalowany w {target_path}")
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else:
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print(f"ℹ️ Skrypt już zainstalowany w {target_path}")
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cron_line = f"15 3 * * * {target_path} --update >> /var/log/node_exporter_cron.log 2>&1"
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try:
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cron_result = run_cmd(['crontab', '-l'], check=False)
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except Exception:
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cron_result = ""
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if cron_line not in cron_result:
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with open('/tmp/node_exporter_cron', 'w') as f:
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f.write(cron_result.strip() + '\n' + cron_line + '\n')
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run_cmd(['crontab', '/tmp/node_exporter_cron'])
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os.remove('/tmp/node_exporter_cron')
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logging.info("Dodano wpis do crontaba")
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print("✅ Zadanie cron dodane")
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else:
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print("ℹ️ Wpis cron już istnieje.")
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logrotate_path = '/etc/logrotate.d/node_exporter_manager'
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logrotate_config = f"""{LOG_FILE} /var/log/node_exporter_cron.log {{
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weekly
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rotate 4
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compress
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missingok
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notifempty
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create 644 root root
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}}
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"""
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with open(logrotate_path, 'w') as f:
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f.write(logrotate_config)
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logging.info("Skonfigurowano logrotate")
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print(f"✅ Logrotate dodany w {logrotate_path}")
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# ----------------- GŁÓWNY BLOK -----------------
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if __name__ == '__main__':
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if os.geteuid() != 0:
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print("Ten skrypt musi być uruchomiony jako root.")
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sys.exit(1)
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if len(sys.argv) != 2 or sys.argv[1] not in ['--install', '--update', '--uninstall', '--setup']:
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print("""
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Użycie:
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node_exporter_manager.py --install # Instaluje node_exporter i uruchamia usługę
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node_exporter_manager.py --update # Aktualizuje node_exporter do najnowszej wersji (jeśli potrzeba)
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node_exporter_manager.py --uninstall # Usuwa node_exporter, usługę, użytkownika
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node_exporter_manager.py --setup # Instaluje ten skrypt do /usr/local/bin, dodaje CRON i logrotate
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""")
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sys.exit(1)
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try:
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{
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'--install': install,
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'--update': update,
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'--uninstall': uninstall,
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'--setup': setup
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}[sys.argv[1]]()
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except Exception as e:
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logging.error(f"Błąd krytyczny: {e}")
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print(f"Wystąpił błąd: {e}")
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sys.exit(1)
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