Add node_exporter_installer.py
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223
node_exporter_installer.py
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223
node_exporter_installer.py
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import os
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import argparse
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import json
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import urllib.request
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import tarfile
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import shutil
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import pwd
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import subprocess
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from pathlib import Path
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try:
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import bcrypt
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BCRYPT_AVAILABLE = True
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except ImportError:
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BCRYPT_AVAILABLE = False
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SYSTEMD_SERVICE_PATH = "/etc/systemd/system/node_exporter.service"
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NODE_EXPORTER_BIN = "/usr/local/bin/node_exporter"
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NODE_EXPORTER_DIR = "/etc/node_exporter"
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def run_safe(cmd):
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subprocess.run(cmd, shell=isinstance(cmd, str), check=True)
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def fetch_latest_download_url():
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url = "https://api.github.com/repos/prometheus/node_exporter/releases/latest"
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with urllib.request.urlopen(url) as response:
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data = json.loads(response.read().decode())
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for asset in data["assets"]:
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if "linux-amd64" in asset["browser_download_url"]:
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return asset["browser_download_url"]
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raise RuntimeError("Nie znaleziono odpowiedniego URL do pobrania")
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def download_and_extract(url, extract_path="/tmp"):
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file_name = url.split("/")[-1]
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download_path = os.path.join(extract_path, file_name)
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print(f"Pobieranie: {url}")
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urllib.request.urlretrieve(url, download_path)
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with tarfile.open(download_path, "r:gz") as tar:
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tar.extractall(path=extract_path)
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for entry in os.listdir(extract_path):
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full_path = os.path.join(extract_path, entry)
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if entry.startswith("node_exporter") and os.path.isdir(full_path):
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return full_path
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raise RuntimeError("Nie znaleziono rozpakowanego katalogu node_exporter")
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def ensure_node_exporter_user():
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try:
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pwd.getpwnam("node_exporter")
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except KeyError:
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run_safe(["useradd", "-rs", "/bin/false", "node_exporter"])
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def install_binary(source_path, force_update=False):
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if os.path.exists(NODE_EXPORTER_BIN):
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if not force_update:
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print("Binarka już istnieje. Użyj --update aby zaktualizować.")
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return
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subprocess.run(["systemctl", "stop", "node_exporter"], check=False)
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shutil.copy(os.path.join(source_path, "node_exporter"), NODE_EXPORTER_BIN)
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os.chmod(NODE_EXPORTER_BIN, 0o755)
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print("Zainstalowano node_exporter.")
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def update_basic_auth_user(credential: str):
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if not BCRYPT_AVAILABLE:
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print("Błąd: brak modułu 'bcrypt'. Zainstaluj go poleceniem:\n pip install bcrypt")
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return
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if ":" not in credential:
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print("Błąd: użyj formatu --set-password user:haslo")
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return
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user, plain_password = credential.split(":", 1)
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config_path = os.path.join(NODE_EXPORTER_DIR, "config.yml")
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if not os.path.exists(config_path):
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print("Plik config.yml nie istnieje – uruchom instalację z --secured najpierw.")
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return
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hashed = bcrypt.hashpw(plain_password.encode(), bcrypt.gensalt()).decode()
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with open(config_path, "r") as f:
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lines = f.readlines()
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new_lines = []
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in_auth = False
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user_updated = False
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for line in lines:
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if line.strip().startswith("basic_auth_users:"):
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in_auth = True
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new_lines.append(line)
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continue
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if in_auth and line.startswith(" ") and ":" in line:
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current_user = line.split(":")[0].strip()
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if current_user == user:
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new_lines.append(f" {user}: {hashed}\n")
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user_updated = True
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else:
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new_lines.append(line)
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elif in_auth and not line.startswith(" "):
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if not user_updated:
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new_lines.append(f" {user}: {hashed}\n")
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user_updated = True
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in_auth = False
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new_lines.append(line)
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else:
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new_lines.append(line)
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if in_auth and not user_updated:
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new_lines.append(f" {user}: {hashed}\n")
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with open(config_path, "w") as f:
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f.writelines(new_lines)
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print(f"Zmieniono hasło dla użytkownika '{user}'.")
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def write_systemd_service(secured=False):
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exec_line = f'{NODE_EXPORTER_BIN} --web.config.file="{NODE_EXPORTER_DIR}/config.yml"' if secured else NODE_EXPORTER_BIN
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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=node_exporter
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ExecStart={exec_line}
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[Install]
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WantedBy=default.target
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"""
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with open(SYSTEMD_SERVICE_PATH, "w") as f:
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f.write(content)
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def setup_ssl_and_auth():
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os.makedirs(NODE_EXPORTER_DIR, exist_ok=True)
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run_safe([
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"openssl", "req", "-new", "-newkey", "rsa:4096", "-days", "3650", "-nodes", "-x509",
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"-subj", "/C=PL/ST=X/L=X/O=linuxiarz.pl/CN=*.linuxiarz.pl",
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"-keyout", f"{NODE_EXPORTER_DIR}/node_exporter.key",
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"-out", f"{NODE_EXPORTER_DIR}/node_exporter.crt"
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])
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config = """basic_auth_users:
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root: $2y$10$SNr5iyJMvqiecOx6tXgDTuBpxyd40Byp2j.iBM5lR/oQnlpi8nAje
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tls_server_config:
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cert_file: node_exporter.crt
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key_file: node_exporter.key
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"""
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with open(os.path.join(NODE_EXPORTER_DIR, "config.yml"), "w") as f:
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f.write(config)
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shutil.chown(NODE_EXPORTER_DIR, user="node_exporter", group="node_exporter")
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for file in os.listdir(NODE_EXPORTER_DIR):
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shutil.chown(os.path.join(NODE_EXPORTER_DIR, file), user="node_exporter", group="node_exporter")
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def enable_and_start_service():
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run_safe(["systemctl", "daemon-reload"])
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run_safe(["systemctl", "enable", "--now", "node_exporter"])
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def uninstall():
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subprocess.run(["systemctl", "stop", "node_exporter"], check=False)
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subprocess.run(["systemctl", "disable", "node_exporter"], check=False)
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if os.path.exists(SYSTEMD_SERVICE_PATH):
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os.remove(SYSTEMD_SERVICE_PATH)
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if os.path.exists(NODE_EXPORTER_BIN):
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os.remove(NODE_EXPORTER_BIN)
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if os.path.isdir(NODE_EXPORTER_DIR):
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shutil.rmtree(NODE_EXPORTER_DIR)
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run_safe(["systemctl", "daemon-reload"])
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print("Node Exporter odinstalowany.")
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def main():
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parser = argparse.ArgumentParser(description="Installer for Prometheus Node Exporter")
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parser.add_argument("--secured", action="store_true", help="Enable TLS and basic auth")
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parser.add_argument("--update", action="store_true", help="Force update of node_exporter binary")
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parser.add_argument("--uninstall", action="store_true", help="Uninstall node_exporter and clean files")
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parser.add_argument("--set-password", type=str, help="Ustaw basic auth (format: user:haslo), działa tylko z --secured")
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args = parser.parse_args()
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if args.uninstall:
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uninstall()
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return
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url = fetch_latest_download_url()
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extracted_dir = download_and_extract(url)
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ensure_node_exporter_user()
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install_binary(extracted_dir, force_update=args.update)
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if args.secured:
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setup_ssl_and_auth()
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write_systemd_service(secured=args.secured)
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enable_and_start_service()
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if args.set_password:
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update_basic_auth_user(args.set_password)
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print("Instalacja zakończona.")
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if __name__ == "__main__":
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main()
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