def manage():
status_set('maintenance', 'starting')
config = hookenv.config()
manager = ServiceManager([
{
'service': 'nrpe-install',
'data_ready': [
nrpe_utils.install_packages,
nrpe_utils.install_charm_files,
],
'start': [],
'stop': [],
},
{
'service': 'nrpe-config',
'required_data': [
config,
nrpe_helpers.MonitorsRelation(),
nrpe_helpers.PrincipalRelation(),
nrpe_helpers.NagiosInfo(),
],
'data_ready': [
nrpe_utils.update_nrpe_external_master_relation,
nrpe_utils.update_monitor_relation,
nrpe_utils.create_host_export_fragment,
nrpe_utils.render_nrped_files,
helpers.render_template(
source='nrpe.tmpl',
target='/etc/nagios/nrpe.cfg'
),
],
'provided_data': [nrpe_helpers.PrincipalRelation()],
'ports': [hookenv.config('server_port'), 'ICMP'],
'start': [nrpe_utils.maybe_open_ports, nrpe_utils.restart_nrpe],
'stop': [],
},
{
'service': 'nrpe-rsync',
'required_data': [
config,
nrpe_helpers.PrincipalRelation(),
nrpe_helpers.RsyncEnabled(),
nrpe_helpers.NagiosInfo(),
],
'data_ready': [
nrpe_utils.remove_host_export_fragments,
helpers.render_template(
source='rsync-juju.d.tmpl',
target='/etc/rsync-juju.d/010-nrpe-external-master.conf'
),
nrpe_utils.create_host_export_fragment,
],
'start': [nrpe_utils.restart_rsync],
'stop': [],
},
])
manager.manage()
status_set('active', 'ready')
def __call__(self, manager, service_name, event_name):
nag_hostname = nrpe_helpers.PrincipalRelation().nagios_hostname()
target = '/var/lib/nagios/export/host__{}.cfg'.format(nag_hostname)
renderer = helpers.render_template(
source='export_host.cfg.tmpl',
target=target,
perms=0o644,
)
renderer(manager, service_name, event_name)
def update_nrpe_external_master_relation(service_name):
"""
Send updated nagios_hostname to charms attached to nrpe_external_master
relation.
"""
principal_relation = nrpe_helpers.PrincipalRelation()
for rid in hookenv.relation_ids('nrpe-external-master'):
hookenv.relation_set(
relation_id=rid,
relation_settings=principal_relation.provide_data())
class Nrpe(CharmBase):
"""Nrpe."""
monitors_relation = nrpe_helpers.MonitorsRelation()
principal_relation = nrpe_helpers.PrincipalRelation()
nagios_info = nrpe_helpers.NagiosInfo()
def __init__(self, *args):
"""Initialize class level attributes and observe events."""
super().__init__(*args)
self._general_info = GeneralInfo(self, 'general-info')
self._local_monitors = LocalMonitors(self, 'local-monitors')
self._monitors = Monitors(self, 'monitors')
self._nrpe_external_master = NrpeExternalMaster(self, 'nrpe-external-master')
self.framework.observe(
self.on.install,
self._on_install
)
self.framework.observe(
self.on.config_changed,
self._on_config_changed
)
self.framework.observe(
self._general_info.on.available,
self._on_check_status_and_configure_event
)
self.framework.observe(
self._monitors.on.available,
self._on_check_status_and_configure_event
)
self.framework.observe(
self._local_monitors.on.available,
self._on_check_status_and_configure_event
)
self.framework.observe(
self._nrpe_external_master.on.available,
self._on_check_status_and_configure_event
)
def _on_install(self, event):
"""Install packages and charm files."""
logger.debug("IN _ON_INSTALL")
logger.debug(monitors_relation.__dict__)
logger.debug(principal_relation.__dict__)
logger.debug(nagios_info.__dict__)
nrpe_utils.install_packages()
nrpe_utils.install_charm_files()
def _on_config_changed(self, event):
logger.debug("IN _ON_CONFIG_CHANGED")
logger.debug(monitors_relation.__dict__)
logger.debug(principal_relation.__dict__)
logger.debug(nagios_info.__dict__)
self._check_status_and_configure_event(event)
def _check_status_and_configure_event(event):
logger.debug("IN _CHECK_STATUS_AND_CONFIGUR")
logger.debug(monitors_relation.__dict__)
logger.debug(principal_relation.__dict__)
logger.debug(nagios_info.__dict__)
if not self._check_status_and_configure():
event.defer()
def _check_status_and_configure(self):
if not self._check_status():
return False
self._configure()
return True
def _check_status(self):
if not (self.monitors_relation and self.principal_relation and
self.nagios_info):
return False
return True
def _configure(self):
nrpe_utils.update_nrpe_external_master_relation()
nrpe_utils.update_monitor_relation()
nrpe_utils.create_host_export_fragment
nrpe_utils.render_nrped_files()
helpers.render_template(
source="nrpe.tmpl", target="/etc/nagios/nrpe.cfg"
)
nrpe_utils.maybe_open_ports
nrpe_utils.restart_nrpe()
def manage():
"""Manage nrpe service."""
status_set("maintenance", "starting")
config = hookenv.config()
manager = ServiceManager([
{
"service":
"nrpe-install",
"data_ready": [
nrpe_utils.install_packages,
nrpe_utils.install_charm_files,
],
"start": [],
"stop": [],
},
{
"service":
"nrpe-config",
"required_data": [
config,
nrpe_helpers.MonitorsRelation(),
nrpe_helpers.PrincipalRelation(),
nrpe_helpers.NagiosInfo(),
],
"data_ready": [
nrpe_utils.update_nrpe_external_master_relation,
nrpe_utils.update_monitor_relation,
nrpe_utils.create_host_export_fragment,
nrpe_utils.render_nrped_files,
helpers.render_template(source="nrpe.tmpl",
target="/etc/nagios/nrpe.cfg"),
],
"provided_data": [nrpe_helpers.PrincipalRelation()],
"ports": [hookenv.config("server_port"), "ICMP"],
"start": [nrpe_utils.maybe_open_ports, nrpe_utils.restart_nrpe],
"stop": [],
},
{
"service":
"nrpe-rsync",
"required_data": [
config,
nrpe_helpers.PrincipalRelation(),
nrpe_helpers.RsyncEnabled(),
nrpe_helpers.NagiosInfo(),
],
"data_ready": [
nrpe_utils.remove_host_export_fragments,
helpers.render_template(
source="rsync-juju.d.tmpl",
target="/etc/rsync-juju.d/010-nrpe-external-master.conf",
),
nrpe_utils.create_host_export_fragment,
],
"start": [nrpe_utils.restart_rsync],
"stop": [],
},
])
manager.manage()
if nrpe_utils.has_consumer():
status_set("active", "ready")
else:
status_set("blocked", "Nagios server not configured or related")