Add NRPE support

Add support for the nrpe subordinate. Check definitions are past from this
charm to the nrpe charm

Change-Id: Icfeddc6ccbec2869a6f0880b4be0f67289d3b745
Closes-Bug: 1557611

charm-helpers-hooks.yaml

@@ -15,3 +15,4 @@ include:
     - contrib.openstack.ip
     - contrib.storage.linux
     - contrib.python.packages
+    - contrib.charmsupport

config.yaml

@@ -175,3 +175,19 @@ options:
       If your prefix has a dash in it that will be used to split the prefix
       into region and zone.  Please read the documentation on federated rados
       gateways for more information on region and zone.
+  nagios_context:
+    default: "juju"
+    type: string
+    description: |
+      Used by the nrpe-external-master subordinate charm.
+      A string that will be prepended to instance name to set the host name
+      in nagios. So for instance the hostname would be something like:
+          juju-myservice-0
+      If you're running multiple environments with the same services in them
+      this allows you to differentiate between them.
+  nagios_servicegroups:
+    default: ""
+    type: string
+    description: |
+      A comma-separated list of nagios servicegroups.
+      If left empty, the nagios_context will be used as the servicegroup

hooks/charmhelpers/contrib/charmsupport/__init__.py

@@ -0,0 +1,15 @@
+# Copyright 2014-2015 Canonical Limited.
+#
+# This file is part of charm-helpers.
+#
+# charm-helpers is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# charm-helpers 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with charm-helpers.  If not, see <http://www.gnu.org/licenses/>.

hooks/charmhelpers/contrib/charmsupport/nrpe.py

@@ -0,0 +1,398 @@
+# Copyright 2014-2015 Canonical Limited.
+#
+# This file is part of charm-helpers.
+#
+# charm-helpers is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# charm-helpers 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with charm-helpers.  If not, see <http://www.gnu.org/licenses/>.
+
+"""Compatibility with the nrpe-external-master charm"""
+# Copyright 2012 Canonical Ltd.
+#
+# Authors:
+#  Matthew Wedgwood <matthew.wedgwood@canonical.com>
+
+import subprocess
+import pwd
+import grp
+import os
+import glob
+import shutil
+import re
+import shlex
+import yaml
+
+from charmhelpers.core.hookenv import (
+    config,
+    local_unit,
+    log,
+    relation_ids,
+    relation_set,
+    relations_of_type,
+)
+
+from charmhelpers.core.host import service
+
+# This module adds compatibility with the nrpe-external-master and plain nrpe
+# subordinate charms. To use it in your charm:
+#
+# 1. Update metadata.yaml
+#
+#   provides:
+#     (...)
+#     nrpe-external-master:
+#       interface: nrpe-external-master
+#       scope: container
+#
+#   and/or
+#
+#   provides:
+#     (...)
+#     local-monitors:
+#       interface: local-monitors
+#       scope: container
+
+#
+# 2. Add the following to config.yaml
+#
+#    nagios_context:
+#      default: "juju"
+#      type: string
+#      description: |
+#        Used by the nrpe subordinate charms.
+#        A string that will be prepended to instance name to set the host name
+#        in nagios. So for instance the hostname would be something like:
+#            juju-myservice-0
+#        If you're running multiple environments with the same services in them
+#        this allows you to differentiate between them.
+#    nagios_servicegroups:
+#      default: ""
+#      type: string
+#      description: |
+#        A comma-separated list of nagios servicegroups.
+#        If left empty, the nagios_context will be used as the servicegroup
+#
+# 3. Add custom checks (Nagios plugins) to files/nrpe-external-master
+#
+# 4. Update your hooks.py with something like this:
+#
+#    from charmsupport.nrpe import NRPE
+#    (...)
+#    def update_nrpe_config():
+#        nrpe_compat = NRPE()
+#        nrpe_compat.add_check(
+#            shortname = "myservice",
+#            description = "Check MyService",
+#            check_cmd = "check_http -w 2 -c 10 http://localhost"
+#            )
+#        nrpe_compat.add_check(
+#            "myservice_other",
+#            "Check for widget failures",
+#            check_cmd = "/srv/myapp/scripts/widget_check"
+#            )
+#        nrpe_compat.write()
+#
+#    def config_changed():
+#        (...)
+#        update_nrpe_config()
+#
+#    def nrpe_external_master_relation_changed():
+#        update_nrpe_config()
+#
+#    def local_monitors_relation_changed():
+#        update_nrpe_config()
+#
+# 5. ln -s hooks.py nrpe-external-master-relation-changed
+#    ln -s hooks.py local-monitors-relation-changed
+
+
+class CheckException(Exception):
+    pass
+
+
+class Check(object):
+    shortname_re = '[A-Za-z0-9-_]+$'
+    service_template = ("""
+#---------------------------------------------------
+# This file is Juju managed
+#---------------------------------------------------
+define service {{
+    use                             active-service
+    host_name                       {nagios_hostname}
+    service_description             {nagios_hostname}[{shortname}] """
+                        """{description}
+    check_command                   check_nrpe!{command}
+    servicegroups                   {nagios_servicegroup}
+}}
+""")
+
+    def __init__(self, shortname, description, check_cmd):
+        super(Check, self).__init__()
+        # XXX: could be better to calculate this from the service name
+        if not re.match(self.shortname_re, shortname):
+            raise CheckException("shortname must match {}".format(
+                Check.shortname_re))
+        self.shortname = shortname
+        self.command = "check_{}".format(shortname)
+        # Note: a set of invalid characters is defined by the
+        # Nagios server config
+        # The default is: illegal_object_name_chars=`~!$%^&*"|'<>?,()=
+        self.description = description
+        self.check_cmd = self._locate_cmd(check_cmd)
+
+    def _get_check_filename(self):
+        return os.path.join(NRPE.nrpe_confdir, '{}.cfg'.format(self.command))
+
+    def _get_service_filename(self, hostname):
+        return os.path.join(NRPE.nagios_exportdir,
+                            'service__{}_{}.cfg'.format(hostname, self.command))
+
+    def _locate_cmd(self, check_cmd):
+        search_path = (
+            '/usr/lib/nagios/plugins',
+            '/usr/local/lib/nagios/plugins',
+        )
+        parts = shlex.split(check_cmd)
+        for path in search_path:
+            if os.path.exists(os.path.join(path, parts[0])):
+                command = os.path.join(path, parts[0])
+                if len(parts) > 1:
+                    command += " " + " ".join(parts[1:])
+                return command
+        log('Check command not found: {}'.format(parts[0]))
+        return ''
+
+    def _remove_service_files(self):
+        if not os.path.exists(NRPE.nagios_exportdir):
+            return
+        for f in os.listdir(NRPE.nagios_exportdir):
+            if f.endswith('_{}.cfg'.format(self.command)):
+                os.remove(os.path.join(NRPE.nagios_exportdir, f))
+
+    def remove(self, hostname):
+        nrpe_check_file = self._get_check_filename()
+        if os.path.exists(nrpe_check_file):
+            os.remove(nrpe_check_file)
+        self._remove_service_files()
+
+    def write(self, nagios_context, hostname, nagios_servicegroups):
+        nrpe_check_file = self._get_check_filename()
+        with open(nrpe_check_file, 'w') as nrpe_check_config:
+            nrpe_check_config.write("# check {}\n".format(self.shortname))
+            nrpe_check_config.write("command[{}]={}\n".format(
+                self.command, self.check_cmd))
+
+        if not os.path.exists(NRPE.nagios_exportdir):
+            log('Not writing service config as {} is not accessible'.format(
+                NRPE.nagios_exportdir))
+        else:
+            self.write_service_config(nagios_context, hostname,
+                                      nagios_servicegroups)
+
+    def write_service_config(self, nagios_context, hostname,
+                             nagios_servicegroups):
+        self._remove_service_files()
+
+        templ_vars = {
+            'nagios_hostname': hostname,
+            'nagios_servicegroup': nagios_servicegroups,
+            'description': self.description,
+            'shortname': self.shortname,
+            'command': self.command,
+        }
+        nrpe_service_text = Check.service_template.format(**templ_vars)
+        nrpe_service_file = self._get_service_filename(hostname)
+        with open(nrpe_service_file, 'w') as nrpe_service_config:
+            nrpe_service_config.write(str(nrpe_service_text))
+
+    def run(self):
+        subprocess.call(self.check_cmd)
+
+
+class NRPE(object):
+    nagios_logdir = '/var/log/nagios'
+    nagios_exportdir = '/var/lib/nagios/export'
+    nrpe_confdir = '/etc/nagios/nrpe.d'
+
+    def __init__(self, hostname=None):
+        super(NRPE, self).__init__()
+        self.config = config()
+        self.nagios_context = self.config['nagios_context']
+        if 'nagios_servicegroups' in self.config and self.config['nagios_servicegroups']:
+            self.nagios_servicegroups = self.config['nagios_servicegroups']
+        else:
+            self.nagios_servicegroups = self.nagios_context
+        self.unit_name = local_unit().replace('/', '-')
+        if hostname:
+            self.hostname = hostname
+        else:
+            nagios_hostname = get_nagios_hostname()
+            if nagios_hostname:
+                self.hostname = nagios_hostname
+            else:
+                self.hostname = "{}-{}".format(self.nagios_context, self.unit_name)
+        self.checks = []
+
+    def add_check(self, *args, **kwargs):
+        self.checks.append(Check(*args, **kwargs))
+
+    def remove_check(self, *args, **kwargs):
+        if kwargs.get('shortname') is None:
+            raise ValueError('shortname of check must be specified')
+
+        # Use sensible defaults if they're not specified - these are not
+        # actually used during removal, but they're required for constructing
+        # the Check object; check_disk is chosen because it's part of the
+        # nagios-plugins-basic package.
+        if kwargs.get('check_cmd') is None:
+            kwargs['check_cmd'] = 'check_disk'
+        if kwargs.get('description') is None:
+            kwargs['description'] = ''
+
+        check = Check(*args, **kwargs)
+        check.remove(self.hostname)
+
+    def write(self):
+        try:
+            nagios_uid = pwd.getpwnam('nagios').pw_uid
+            nagios_gid = grp.getgrnam('nagios').gr_gid
+        except:
+            log("Nagios user not set up, nrpe checks not updated")
+            return
+
+        if not os.path.exists(NRPE.nagios_logdir):
+            os.mkdir(NRPE.nagios_logdir)
+            os.chown(NRPE.nagios_logdir, nagios_uid, nagios_gid)
+
+        nrpe_monitors = {}
+        monitors = {"monitors": {"remote": {"nrpe": nrpe_monitors}}}
+        for nrpecheck in self.checks:
+            nrpecheck.write(self.nagios_context, self.hostname,
+                            self.nagios_servicegroups)
+            nrpe_monitors[nrpecheck.shortname] = {
+                "command": nrpecheck.command,
+            }
+
+        service('restart', 'nagios-nrpe-server')
+
+        monitor_ids = relation_ids("local-monitors") + \
+            relation_ids("nrpe-external-master")
+        for rid in monitor_ids:
+            relation_set(relation_id=rid, monitors=yaml.dump(monitors))
+
+
+def get_nagios_hostcontext(relation_name='nrpe-external-master'):
+    """
+    Query relation with nrpe subordinate, return the nagios_host_context
+
+    :param str relation_name: Name of relation nrpe sub joined to
+    """
+    for rel in relations_of_type(relation_name):
+        if 'nagios_host_context' in rel:
+            return rel['nagios_host_context']
+
+
+def get_nagios_hostname(relation_name='nrpe-external-master'):
+    """
+    Query relation with nrpe subordinate, return the nagios_hostname
+
+    :param str relation_name: Name of relation nrpe sub joined to
+    """
+    for rel in relations_of_type(relation_name):
+        if 'nagios_hostname' in rel:
+            return rel['nagios_hostname']
+
+
+def get_nagios_unit_name(relation_name='nrpe-external-master'):
+    """
+    Return the nagios unit name prepended with host_context if needed
+
+    :param str relation_name: Name of relation nrpe sub joined to
+    """
+    host_context = get_nagios_hostcontext(relation_name)
+    if host_context:
+        unit = "%s:%s" % (host_context, local_unit())
+    else:
+        unit = local_unit()
+    return unit
+
+
+def add_init_service_checks(nrpe, services, unit_name):
+    """
+    Add checks for each service in list
+
+    :param NRPE nrpe: NRPE object to add check to
+    :param list services: List of services to check
+    :param str unit_name: Unit name to use in check description
+    """
+    for svc in services:
+        upstart_init = '/etc/init/%s.conf' % svc
+        sysv_init = '/etc/init.d/%s' % svc
+        if os.path.exists(upstart_init):
+            # Don't add a check for these services from neutron-gateway
+            if svc not in ['ext-port', 'os-charm-phy-nic-mtu']:
+                nrpe.add_check(
+                    shortname=svc,
+                    description='process check {%s}' % unit_name,
+                    check_cmd='check_upstart_job %s' % svc
+                )
+        elif os.path.exists(sysv_init):
+            cronpath = '/etc/cron.d/nagios-service-check-%s' % svc
+            cron_file = ('*/5 * * * * root '
+                         '/usr/local/lib/nagios/plugins/check_exit_status.pl '
+                         '-s /etc/init.d/%s status > '
+                         '/var/lib/nagios/service-check-%s.txt\n' % (svc,
+                                                                     svc)
+                         )
+            f = open(cronpath, 'w')
+            f.write(cron_file)
+            f.close()
+            nrpe.add_check(
+                shortname=svc,
+                description='process check {%s}' % unit_name,
+                check_cmd='check_status_file.py -f '
+                          '/var/lib/nagios/service-check-%s.txt' % svc,
+            )
+
+
+def copy_nrpe_checks():
+    """
+    Copy the nrpe checks into place
+
+    """
+    NAGIOS_PLUGINS = '/usr/local/lib/nagios/plugins'
+    nrpe_files_dir = os.path.join(os.getenv('CHARM_DIR'), 'hooks',
+                                  'charmhelpers', 'contrib', 'openstack',
+                                  'files')
+
+    if not os.path.exists(NAGIOS_PLUGINS):
+        os.makedirs(NAGIOS_PLUGINS)
+    for fname in glob.glob(os.path.join(nrpe_files_dir, "check_*")):
+        if os.path.isfile(fname):
+            shutil.copy2(fname,
+                         os.path.join(NAGIOS_PLUGINS, os.path.basename(fname)))
+
+
+def add_haproxy_checks(nrpe, unit_name):
+    """
+    Add checks for each service in list
+
+    :param NRPE nrpe: NRPE object to add check to
+    :param str unit_name: Unit name to use in check description
+    """
+    nrpe.add_check(
+        shortname='haproxy_servers',
+        description='Check HAProxy {%s}' % unit_name,
+        check_cmd='check_haproxy.sh')
+    nrpe.add_check(
+        shortname='haproxy_queue',
+        description='Check HAProxy queue depth {%s}' % unit_name,
+        check_cmd='check_haproxy_queue_depth.sh')

hooks/charmhelpers/contrib/charmsupport/volumes.py

@@ -0,0 +1,175 @@
+# Copyright 2014-2015 Canonical Limited.
+#
+# This file is part of charm-helpers.
+#
+# charm-helpers is free software: you can redistribute it and/or modify
+# it under the terms of the GNU Lesser General Public License version 3 as
+# published by the Free Software Foundation.
+#
+# charm-helpers 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 Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public License
+# along with charm-helpers.  If not, see <http://www.gnu.org/licenses/>.
+
+'''
+Functions for managing volumes in juju units. One volume is supported per unit.
+Subordinates may have their own storage, provided it is on its own partition.
+
+Configuration stanzas::
+
+  volume-ephemeral:
+    type: boolean
+    default: true
+    description: >
+      If false, a volume is mounted as sepecified in "volume-map"
+      If true, ephemeral storage will be used, meaning that log data
+         will only exist as long as the machine. YOU HAVE BEEN WARNED.
+  volume-map:
+    type: string
+    default: {}
+    description: >
+      YAML map of units to device names, e.g:
+        "{ rsyslog/0: /dev/vdb, rsyslog/1: /dev/vdb }"
+      Service units will raise a configure-error if volume-ephemeral
+      is 'true' and no volume-map value is set. Use 'juju set' to set a
+      value and 'juju resolved' to complete configuration.
+
+Usage::
+
+    from charmsupport.volumes import configure_volume, VolumeConfigurationError
+    from charmsupport.hookenv import log, ERROR
+    def post_mount_hook():
+        stop_service('myservice')
+    def post_mount_hook():
+        start_service('myservice')
+
+    if __name__ == '__main__':
+        try:
+            configure_volume(before_change=pre_mount_hook,
+                             after_change=post_mount_hook)
+        except VolumeConfigurationError:
+            log('Storage could not be configured', ERROR)
+
+'''
+
+# XXX: Known limitations
+# - fstab is neither consulted nor updated
+
+import os
+from charmhelpers.core import hookenv
+from charmhelpers.core import host
+import yaml
+
+
+MOUNT_BASE = '/srv/juju/volumes'
+
+
+class VolumeConfigurationError(Exception):
+    '''Volume configuration data is missing or invalid'''
+    pass
+
+
+def get_config():
+    '''Gather and sanity-check volume configuration data'''
+    volume_config = {}
+    config = hookenv.config()
+
+    errors = False
+
+    if config.get('volume-ephemeral') in (True, 'True', 'true', 'Yes', 'yes'):
+        volume_config['ephemeral'] = True
+    else:
+        volume_config['ephemeral'] = False
+
+    try:
+        volume_map = yaml.safe_load(config.get('volume-map', '{}'))
+    except yaml.YAMLError as e:
+        hookenv.log("Error parsing YAML volume-map: {}".format(e),
+                    hookenv.ERROR)
+        errors = True
+    if volume_map is None:
+        # probably an empty string
+        volume_map = {}
+    elif not isinstance(volume_map, dict):
+        hookenv.log("Volume-map should be a dictionary, not {}".format(
+            type(volume_map)))
+        errors = True
+
+    volume_config['device'] = volume_map.get(os.environ['JUJU_UNIT_NAME'])
+    if volume_config['device'] and volume_config['ephemeral']:
+        # asked for ephemeral storage but also defined a volume ID
+        hookenv.log('A volume is defined for this unit, but ephemeral '
+                    'storage was requested', hookenv.ERROR)
+        errors = True
+    elif not volume_config['device'] and not volume_config['ephemeral']:
+        # asked for permanent storage but did not define volume ID
+        hookenv.log('Ephemeral storage was requested, but there is no volume '
+                    'defined for this unit.', hookenv.ERROR)
+        errors = True
+
+    unit_mount_name = hookenv.local_unit().replace('/', '-')
+    volume_config['mountpoint'] = os.path.join(MOUNT_BASE, unit_mount_name)
+
+    if errors:
+        return None
+    return volume_config
+
+
+def mount_volume(config):
+    if os.path.exists(config['mountpoint']):
+        if not os.path.isdir(config['mountpoint']):
+            hookenv.log('Not a directory: {}'.format(config['mountpoint']))
+            raise VolumeConfigurationError()
+    else:
+        host.mkdir(config['mountpoint'])
+    if os.path.ismount(config['mountpoint']):
+        unmount_volume(config)
+    if not host.mount(config['device'], config['mountpoint'], persist=True):
+        raise VolumeConfigurationError()
+
+
+def unmount_volume(config):
+    if os.path.ismount(config['mountpoint']):
+        if not host.umount(config['mountpoint'], persist=True):
+            raise VolumeConfigurationError()
+
+
+def managed_mounts():
+    '''List of all mounted managed volumes'''
+    return filter(lambda mount: mount[0].startswith(MOUNT_BASE), host.mounts())
+
+
+def configure_volume(before_change=lambda: None, after_change=lambda: None):
+    '''Set up storage (or don't) according to the charm's volume configuration.
+       Returns the mount point or "ephemeral". before_change and after_change
+       are optional functions to be called if the volume configuration changes.
+    '''
+
+    config = get_config()
+    if not config:
+        hookenv.log('Failed to read volume configuration', hookenv.CRITICAL)
+        raise VolumeConfigurationError()
+
+    if config['ephemeral']:
+        if os.path.ismount(config['mountpoint']):
+            before_change()
+            unmount_volume(config)
+            after_change()
+        return 'ephemeral'
+    else:
+        # persistent storage
+        if os.path.ismount(config['mountpoint']):
+            mounts = dict(managed_mounts())
+            if mounts.get(config['mountpoint']) != config['device']:
+                before_change()
+                unmount_volume(config)
+                mount_volume(config)
+                after_change()
+        else:
+            before_change()
+            mount_volume(config)
+            after_change()
+        return config['mountpoint']

hooks/charmhelpers/contrib/openstack/amulet/utils.py

@@ -31,7 +31,7 @@ from keystoneclient.auth.identity import v3 as keystone_id_v3
 from keystoneclient import session as keystone_session
 from keystoneclient.v3 import client as keystone_client_v3
 
-import novaclient.v1_1.client as nova_client
+import novaclient.client as nova_client
 import pika
 import swiftclient
 
@@ -42,6 +42,8 @@ from charmhelpers.contrib.amulet.utils import (
 DEBUG = logging.DEBUG
 ERROR = logging.ERROR
 
+NOVA_CLIENT_VERSION = "2"
+
 
 class OpenStackAmuletUtils(AmuletUtils):
     """OpenStack amulet utilities.
@@ -157,12 +159,12 @@ class OpenStackAmuletUtils(AmuletUtils):
                 if e['name'] == act.name:
                     a = {'enabled': act.enabled, 'name': act.name,
                          'email': act.email, 'id': act.id}
-                    if api_version == 2:
+                    if api_version == 3:
-                        a['tenantId'] = act.tenantId
-                    else:
                         a['default_project_id'] = getattr(act,
                                                           'default_project_id',
                                                           'none')
+                    else:
+                        a['tenantId'] = act.tenantId
                     found = True
                     ret = self._validate_dict_data(e, a)
                     if ret:
@@ -249,7 +251,8 @@ class OpenStackAmuletUtils(AmuletUtils):
         self.log.debug('Authenticating nova user ({})...'.format(user))
         ep = keystone.service_catalog.url_for(service_type='identity',
                                               endpoint_type='publicURL')
-        return nova_client.Client(username=user, api_key=password,
+        return nova_client.Client(NOVA_CLIENT_VERSION,
+                                  username=user, api_key=password,
                                   project_id=tenant, auth_url=ep)
 
     def authenticate_swift_user(self, keystone, user, password, tenant):

hooks/charmhelpers/contrib/openstack/utils.py

@@ -137,7 +137,7 @@ SWIFT_CODENAMES = OrderedDict([
     ('liberty',
         ['2.3.0', '2.4.0', '2.5.0']),
     ('mitaka',
-        ['2.5.0']),
+        ['2.5.0', '2.6.0']),
 ])
 
 # >= Liberty version->codename mapping

hooks/charmhelpers/contrib/storage/linux/ceph.py

@@ -173,7 +173,7 @@ class Pool(object):
         elif mode == 'writeback':
             check_call(['ceph', '--id', self.service, 'osd', 'tier', 'cache-mode', cache_pool, 'forward'])
             # Flush the cache and wait for it to return
-            check_call(['ceph', '--id', self.service, '-p', cache_pool, 'cache-flush-evict-all'])
+            check_call(['rados', '--id', self.service, '-p', cache_pool, 'cache-flush-evict-all'])
             check_call(['ceph', '--id', self.service, 'osd', 'tier', 'remove-overlay', self.name])
             check_call(['ceph', '--id', self.service, 'osd', 'tier', 'remove', self.name, cache_pool])
 

hooks/hooks.py

@@ -68,7 +68,9 @@ from utils import (
     REQUIRED_INTERFACES,
     check_optional_relations,
     setup_ipv6,
+    services,
 )
+from charmhelpers.contrib.charmsupport import nrpe
 
 hooks = Hooks()
 CONFIGS = register_configs()
@@ -265,6 +267,7 @@ def config_changed():
         # Ensure started but do a soft reload
         subprocess.call(['service', 'apache2', 'start'])
         subprocess.call(['service', 'apache2', 'reload'])
+    update_nrpe_config()
 
 
 @hooks.hook('mon-relation-departed',
@@ -432,6 +435,20 @@ def ha_relation_changed():
             identity_joined(relid=r_id)
 
 
+@hooks.hook('nrpe-external-master-relation-joined',
+            'nrpe-external-master-relation-changed')
+def update_nrpe_config():
+    # python-dbus is used by check_upstart_job
+    apt_install('python-dbus')
+    hostname = nrpe.get_nagios_hostname()
+    current_unit = nrpe.get_nagios_unit_name()
+    nrpe_setup = nrpe.NRPE(hostname=hostname)
+    nrpe.copy_nrpe_checks()
+    nrpe.add_init_service_checks(nrpe_setup, services(), current_unit)
+    nrpe.add_haproxy_checks(nrpe_setup, current_unit)
+    nrpe_setup.write()
+
+
 if __name__ == '__main__':
     try:
         hooks.execute(sys.argv)

hooks/nrpe-external-master-relation-changed

@@ -0,0 +1 @@
+hooks.py

hooks/nrpe-external-master-relation-joined

@@ -0,0 +1 @@
+hooks.py

hooks/utils.py

@@ -124,6 +124,14 @@ def render_template(template_name, context, template_dir=TEMPLATES_DIR):
     return template.render(context)
 
 
+def services():
+    ''' Returns a list of services associate with this charm '''
+    _services = []
+    for v in BASE_RESOURCE_MAP.values():
+        _services.extend(v.get('services', []))
+    return list(set(_services))
+
+
 def enable_pocket(pocket):
     apt_sources = "/etc/apt/sources.list"
     with open(apt_sources, "r") as sources:

metadata.yaml

@@ -21,6 +21,9 @@ requires:
     interface: hacluster
     scope: container
 provides:
+  nrpe-external-master:
+    interface: nrpe-external-master
+    scope: container
   gateway:
     interface: http
 peers:

tests/charmhelpers/contrib/openstack/amulet/utils.py

@@ -31,7 +31,7 @@ from keystoneclient.auth.identity import v3 as keystone_id_v3
 from keystoneclient import session as keystone_session
 from keystoneclient.v3 import client as keystone_client_v3
 
-import novaclient.v1_1.client as nova_client
+import novaclient.client as nova_client
 import pika
 import swiftclient
 
@@ -42,6 +42,8 @@ from charmhelpers.contrib.amulet.utils import (
 DEBUG = logging.DEBUG
 ERROR = logging.ERROR
 
+NOVA_CLIENT_VERSION = "2"
+
 
 class OpenStackAmuletUtils(AmuletUtils):
     """OpenStack amulet utilities.
@@ -157,12 +159,12 @@ class OpenStackAmuletUtils(AmuletUtils):
                 if e['name'] == act.name:
                     a = {'enabled': act.enabled, 'name': act.name,
                          'email': act.email, 'id': act.id}
-                    if api_version == 2:
+                    if api_version == 3:
-                        a['tenantId'] = act.tenantId
-                    else:
                         a['default_project_id'] = getattr(act,
                                                           'default_project_id',
                                                           'none')
+                    else:
+                        a['tenantId'] = act.tenantId
                     found = True
                     ret = self._validate_dict_data(e, a)
                     if ret:
@@ -249,7 +251,8 @@ class OpenStackAmuletUtils(AmuletUtils):
         self.log.debug('Authenticating nova user ({})...'.format(user))
         ep = keystone.service_catalog.url_for(service_type='identity',
                                               endpoint_type='publicURL')
-        return nova_client.Client(username=user, api_key=password,
+        return nova_client.Client(NOVA_CLIENT_VERSION,
+                                  username=user, api_key=password,
                                   project_id=tenant, auth_url=ep)
 
     def authenticate_swift_user(self, keystone, user, password, tenant):

unit_tests/test_hooks.py

@@ -112,12 +112,14 @@ class CephRadosGWTests(CharmTestCase):
         self.enable_pocket.assert_called_with('multiverse')
         self.os.makedirs.called_with('/var/lib/ceph/nss')
 
+    @patch.object(ceph_hooks, 'update_nrpe_config')
     @patch.object(ceph_hooks, 'mkdir', lambda *args: None)
-    def test_config_changed(self):
+    def test_config_changed(self, update_nrpe_config):
         _install_packages = self.patch('install_packages')
         ceph_hooks.config_changed()
         self.assertTrue(_install_packages.called)
         self.CONFIGS.write_all.assert_called_with()
+        update_nrpe_config.assert_called_with()
 
     @patch.object(ceph_hooks, 'is_request_complete',
                   lambda *args, **kwargs: True)