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service_monitoring_prometheus.py
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service_monitoring_prometheus.py
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#!/usr/bin/env python3
#
# Copyright (C) 2024 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
import os
from sys import exit
from vyos.config import Config
from vyos.configdict import is_node_changed
from vyos.configverify import verify_vrf
from vyos.template import render
from vyos.utils.process import call
from vyos import ConfigError
from vyos import airbag
airbag.enable()
node_exporter_service_file = '/etc/systemd/system/node_exporter.service'
node_exporter_systemd_service = 'node_exporter.service'
frr_exporter_service_file = '/etc/systemd/system/frr_exporter.service'
frr_exporter_systemd_service = 'frr_exporter.service'
blackbox_exporter_service_file = '/etc/systemd/system/blackbox_exporter.service'
blackbox_exporter_systemd_service = 'blackbox_exporter.service'
def get_config(config=None):
if config:
conf = config
else:
conf = Config()
base = ['service', 'monitoring', 'prometheus']
if not conf.exists(base):
return None
monitoring = conf.get_config_dict(
base, key_mangling=('-', '_'), get_first_key=True, with_recursive_defaults=True
)
tmp = is_node_changed(conf, base + ['node-exporter', 'vrf'])
if tmp:
monitoring.update({'node_exporter_restart_required': {}})
tmp = is_node_changed(conf, base + ['frr-exporter', 'vrf'])
if tmp:
monitoring.update({'frr_exporter_restart_required': {}})
tmp = False
for node in ['vrf', 'config-file']:
tmp = tmp or is_node_changed(conf, base + ['blackbox-exporter', node])
if tmp:
monitoring.update({'blackbox_exporter_restart_required': {}})
return monitoring
def verify(monitoring):
if not monitoring:
return None
if 'node_exporter' in monitoring:
verify_vrf(monitoring['node_exporter'])
if 'frr_exporter' in monitoring:
verify_vrf(monitoring['frr_exporter'])
if 'blackbox_exporter' in monitoring:
verify_vrf(monitoring['blackbox_exporter'])
if (
'modules' in monitoring['blackbox_exporter']
and 'dns' in monitoring['blackbox_exporter']['modules']
and 'name' in monitoring['blackbox_exporter']['modules']['dns']
):
for mod_name, mod_config in monitoring['blackbox_exporter']['modules'][
'dns'
]['name'].items():
if 'query_name' not in mod_config:
raise ConfigError(
f'query name not specified in dns module {mod_name}'
)
return None
def generate(monitoring):
if not monitoring or 'node_exporter' not in monitoring:
# Delete systemd files
if os.path.isfile(node_exporter_service_file):
os.unlink(node_exporter_service_file)
if not monitoring or 'frr_exporter' not in monitoring:
# Delete systemd files
if os.path.isfile(frr_exporter_service_file):
os.unlink(frr_exporter_service_file)
if not monitoring or 'blackbox_exporter' not in monitoring:
# Delete systemd files
if os.path.isfile(blackbox_exporter_service_file):
os.unlink(blackbox_exporter_service_file)
if not monitoring:
return None
if 'node_exporter' in monitoring:
# Render node_exporter node_exporter_service_file
render(
node_exporter_service_file,
'prometheus/node_exporter.service.j2',
monitoring['node_exporter'],
)
if 'frr_exporter' in monitoring:
# Render frr_exporter service_file
render(
frr_exporter_service_file,
'prometheus/frr_exporter.service.j2',
monitoring['frr_exporter'],
)
if 'blackbox_exporter' in monitoring:
# Render blackbox_exporter service_file
render(
blackbox_exporter_service_file,
'prometheus/blackbox_exporter.service.j2',
monitoring['blackbox_exporter'],
)
# Render blackbox_exporter config file
render(
'/run/blackbox_exporter/config.yml',
'prometheus/blackbox_exporter.yml.j2',
monitoring['blackbox_exporter'],
)
return None
def apply(monitoring):
# Reload systemd manager configuration
call('systemctl daemon-reload')
if not monitoring or 'node_exporter' not in monitoring:
call(f'systemctl stop {node_exporter_systemd_service}')
if not monitoring or 'frr_exporter' not in monitoring:
call(f'systemctl stop {frr_exporter_systemd_service}')
if not monitoring or 'blackbox_exporter' not in monitoring:
call(f'systemctl stop {blackbox_exporter_systemd_service}')
if not monitoring:
return
if 'node_exporter' in monitoring:
# we need to restart the service if e.g. the VRF name changed
systemd_action = 'reload-or-restart'
if 'node_exporter_restart_required' in monitoring:
systemd_action = 'restart'
call(f'systemctl {systemd_action} {node_exporter_systemd_service}')
if 'frr_exporter' in monitoring:
# we need to restart the service if e.g. the VRF name changed
systemd_action = 'reload-or-restart'
if 'frr_exporter_restart_required' in monitoring:
systemd_action = 'restart'
call(f'systemctl {systemd_action} {frr_exporter_systemd_service}')
if 'blackbox_exporter' in monitoring:
# we need to restart the service if e.g. the VRF name changed
systemd_action = 'reload-or-restart'
if 'blackbox_exporter_restart_required' in monitoring:
systemd_action = 'restart'
call(f'systemctl {systemd_action} {blackbox_exporter_systemd_service}')
if __name__ == '__main__':
try:
c = get_config()
verify(c)
generate(c)
apply(c)
except ConfigError as e:
print(e)
exit(1)

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