openstack/charm-neutron-openvswitch
Code Issues Proposed changes

Use hosts official name for FQDN

Browse Source 
The current implementations use of a specific interface to build
FQDN from has the undesired side effect of the ``nova-compute`` and
``neutron-openvswitch`` charms ending up with using different
hostnames in some situations.  It may also lead to use of a
identifier that is mutable throughout the lifetime of a deployment.

Use of a specific interface was chosen due to ``socket.getfqdn()``
not giving reliable results (https://bugs.python.org/issue5004).

This patch gets the FQDN by mimicking the behaviour of a call to
``hostname -f`` with fallback to shortname on failure.

Add relevant update from c-h.

Depends-On: I82db81937e5a46dc6bd222b7160ca1fa5b190c10
Change-Id: Ic8f8742261b773484687985aa0a366391cd2737a
Closes-Bug: #1839300
This commit is contained in:
Frode Nordahl 2020-01-10 10:57:44 +01:00 committed by Frode Nordahl
parent 4b2935d5a6
commit ee709a5ab3
No known key found for this signature in database
GPG Key ID: 6A5D59A3BA48373F
8 changed files with 108 additions and 83 deletions
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61
hooks/charmhelpers/contrib/openstack/context.py
View File

@ -2177,9 +2177,66 @@ class LogrotateContext(OSContextGenerator):
class HostInfoContext(OSContextGenerator):
"""Context to provide host information."""
def __init__(self, use_fqdn_hint_cb=None):
"""Initialize HostInfoContext
:param use_fqdn_hint_cb: Callback whose return value used to populate
`use_fqdn_hint`
:type use_fqdn_hint_cb: Callable[[], bool]
"""
# Store callback used to get hint for whether FQDN should be used
# Depending on the workload a charm manages, the use of FQDN vs.
# shortname may be a deploy-time decision, i.e. behaviour can not
# change on charm upgrade or post-deployment configuration change.
# The hint is passed on as a flag in the context to allow the decision
# to be made in the Jinja2 configuration template.
self.use_fqdn_hint_cb = use_fqdn_hint_cb
def _get_canonical_name(self, name=None):
"""Get the official FQDN of the host
The implementation of ``socket.getfqdn()`` in the standard Python
library does not exhaust all methods of getting the official name
of a host ref Python issue https://bugs.python.org/issue5004
This function mimics the behaviour of a call to ``hostname -f`` to
get the official FQDN but returns an empty string if it is
unsuccessful.
:param name: Shortname to get FQDN on
:type name: Optional[str]
:returns: The official FQDN for host or empty string ('')
:rtype: str
"""
name = name or socket.gethostname()
fqdn = ''
if six.PY2:
exc = socket.error
else:
exc = OSError
try:
addrs = socket.getaddrinfo(
name, None, 0, socket.SOCK_DGRAM, 0, socket.AI_CANONNAME)
except exc:
pass
else:
for addr in addrs:
if addr[3]:
if '.' in addr[3]:
fqdn = addr[3]
break
return fqdn
def __call__(self):
name = socket.gethostname()
ctxt = {
'host_fqdn': socket.getfqdn(),
'host': socket.gethostname(),
'host_fqdn': self._get_canonical_name(name) or name,
'host': name,
'use_fqdn_hint': (
self.use_fqdn_hint_cb() if self.use_fqdn_hint_cb else False)
}
return ctxt

32
hooks/neutron_ovs_context.py
View File

@ -15,7 +15,6 @@
import collections
import glob
import os
import socket
import uuid
from pci import PCINetDevices
from charmhelpers.core.hookenv import (
@ -39,7 +38,6 @@ from charmhelpers.contrib.openstack.utils import (
)
from charmhelpers.contrib.network.ip import (
get_address_in_network,
get_relation_ip,
)
from charmhelpers.contrib.openstack.context import (
OSContextGenerator,
@ -50,7 +48,6 @@ from charmhelpers.contrib.openstack.utils import (
os_release,
CompareOpenStackReleases,
)
import charmhelpers.contrib.openstack.utils as os_utils
from charmhelpers.core.unitdata import kv
IPTABLES_HYBRID = 'iptables_hybrid'
@ -624,32 +621,3 @@ class APIIdentityServiceContext(context.IdentityServiceContext):
if ctxt['region']:
return ctxt
return ctxt
class HostIPContext(context.OSContextGenerator):
def __call__(self):
ctxt = {}
# Use the address used in the neutron-plugin subordinate relation
host_ip = get_relation_ip('neutron-plugin')
cmp_release = os_utils.CompareOpenStackReleases(
os_utils.os_release('neutron-common', base='icehouse'))
# the contents of the Neutron ``host`` configuration option is
# referenced throughout a OpenStack deployment, an example being
# Neutron port bindings. It's value should not change after a
# individual units initial deployment.
#
# We do want to migrate to using FQDNs so we enable this for new
# installations.
db = kv()
if (db.get('neutron-ovs-charm-use-fqdn', False) and
cmp_release >= 'stein' and
host_ip):
fqdn = socket.getfqdn(host_ip)
if '.' in fqdn:
# only populate the value if getfqdn() is able to find an
# actual FQDN for this host. If not, we revert back to
# not setting the configuration option and use Neutron's
# default behaviour.
ctxt['host'] = fqdn
return ctxt

14
hooks/neutron_ovs_hooks.py
View File

@ -19,6 +19,8 @@ import uuid
from copy import deepcopy
from charmhelpers.contrib.openstack import context as os_context
from charmhelpers.contrib.openstack.utils import (
pausable_restart_on_change as restart_on_change,
series_upgrade_prepare,
@ -51,6 +53,7 @@ from neutron_ovs_utils import (
L3HA_PACKAGES,
METADATA_PACKAGES,
OVS_DEFAULT,
USE_FQDN_KEY,
configure_ovs,
configure_sriov,
get_shared_secret,
@ -70,10 +73,9 @@ from neutron_ovs_utils import (
determine_purge_packages,
install_sriov_systemd_files,
enable_sriov,
use_fqdn_hint,
)
import neutron_ovs_context
hooks = Hooks()
CONFIGS = register_configs()
@ -87,7 +89,7 @@ def install():
release = os_release('neutron-common')
if CompareOpenStackReleases(release) >= 'stein':
db = kv()
db.set('neutron-ovs-charm-use-fqdn', True)
db.set(USE_FQDN_KEY, True)
db.flush()
@ -205,9 +207,9 @@ def neutron_plugin_joined(relation_id=None, request_restart=False):
rel_data = {
'metadata-shared-secret': secret,
}
host = neutron_ovs_context.HostIPContext()().get('host')
if host:
rel_data.update({'host': host})
host_info = os_context.HostInfoContext()()
if use_fqdn_hint() and host_info.get('host_fqdn'):
rel_data.update({'host': host_info['host_fqdn']})
if request_restart:
rel_data['restart-nonce'] = str(uuid.uuid4())
relation_set(relation_id=relation_id, **rel_data)

15
hooks/neutron_ovs_utils.py
View File

@ -33,6 +33,7 @@ from charmhelpers.contrib.openstack.utils import (
CompareOpenStackReleases,
os_release,
)
from charmhelpers.core.unitdata import kv
from collections import OrderedDict
import neutron_ovs_context
from charmhelpers.contrib.network.ovs import (
@ -153,6 +154,18 @@ NEUTRON_SRIOV_SYSTEMD_UNIT = os.path.join('/lib/systemd/system',
NEUTRON_SRIOV_UPSTART_CONF = os.path.join('/etc/init',
'neutron-openvswitch-'
'networking-sriov.conf')
USE_FQDN_KEY = 'neutron-ovs-charm-use-fqdn'
def use_fqdn_hint():
"""Hint for whether FQDN should be used for agent registration
:returns: True or False
:rtype: bool
"""
db = kv()
return db.get(USE_FQDN_KEY, False)
BASE_RESOURCE_MAP = OrderedDict([
(NEUTRON_CONF, {
@ -163,7 +176,7 @@ BASE_RESOURCE_MAP = OrderedDict([
context.AMQPContext(ssl_dir=NEUTRON_CONF_DIR),
context.ZeroMQContext(),
context.NotificationDriverContext(),
neutron_ovs_context.HostIPContext(),
context.HostInfoContext(use_fqdn_hint_cb=use_fqdn_hint),
neutron_ovs_context.ZoneContext(),
],
}),

4
templates/stein/neutron.conf
View File

@ -23,8 +23,8 @@ core_plugin = {{ core_plugin }}
transport_url = {{ transport_url }}
{% endif %}
{% if host -%}
host = {{ host }}
{% if use_fqdn_hint and host_fqdn -%}
host = {{ host_fqdn }}
{% endif -%}
api_paste_config = /etc/neutron/api-paste.ini

28
unit_tests/test_neutron_ovs_context.py
View File

@ -1027,31 +1027,3 @@ class TestFirewallDriver(CharmTestCase):
self.lsb_release.return_value = _LSB_RELEASE_XENIAL
self.assertEqual(context._get_firewall_driver(ctxt),
context.IPTABLES_HYBRID)
class TestHostIPContext(CharmTestCase):
def setUp(self):
super(TestHostIPContext, self).setUp(context, TO_PATCH)
self.config.side_effect = self.test_config.get
@patch.object(context.os_utils, 'os_release')
@patch.object(context.socket, 'getfqdn')
@patch.object(context, 'kv')
@patch.object(context, 'get_relation_ip')
def test_host_ip_context(self, _get_relation_ip, _kv, _getfqdn,
_os_release):
_os_release.return_value = 'stein'
_kv.return_value = {'install_version': 0}
_getfqdn.return_value = 'some'
ctxt = context.HostIPContext()
self.assertDictEqual({}, ctxt())
_getfqdn.return_value = 'some.hostname'
ctxt = context.HostIPContext()
self.assertDictEqual({}, ctxt())
_kv.return_value = {'neutron-ovs-charm-use-fqdn': True}
ctxt = context.HostIPContext()
self.assertDictEqual({'host': 'some.hostname'}, ctxt())
_os_release.return_value = 'rocky'
ctxt = context.HostIPContext()
self.assertDictEqual({}, ctxt())

28
unit_tests/test_neutron_ovs_hooks.py
View File

@ -18,6 +18,7 @@ from test_utils import CharmTestCase
with patch('charmhelpers.core.hookenv.config') as config:
config.return_value = 'neutron'
with patch('charmhelpers.contrib.openstack.context.HostInfoContext'):
import neutron_ovs_utils as utils
_reg = utils.register_configs
@ -82,8 +83,7 @@ class NeutronOVSHooksTests(CharmTestCase):
_os_release.return_value = 'stein'
self._call_hook('install')
_kv.assert_called_once_with()
fake_dict.set.assert_called_once_with(
'neutron-ovs-charm-use-fqdn', True)
fake_dict.set.assert_called_once_with(hooks.USE_FQDN_KEY, True)
@patch('neutron_ovs_hooks.enable_sriov', MagicMock(return_value=False))
@patch.object(hooks, 'restart_map')
@ -183,13 +183,15 @@ class NeutronOVSHooksTests(CharmTestCase):
'libnetfilter-log1',
'keepalived'])
@patch.object(hooks.neutron_ovs_context, 'HostIPContext')
def test_neutron_plugin_joined_dvr_dhcp(self, _HostIPContext):
@patch.object(hooks, 'use_fqdn_hint')
@patch.object(hooks.os_context, 'HostInfoContext')
def test_neutron_plugin_joined_dvr_dhcp(
self, _HostInfoContext, _use_fqdn_hint):
self.enable_nova_metadata.return_value = True
self.enable_local_dhcp.return_value = True
self.use_dvr.return_value = True
self.get_shared_secret.return_value = 'secret'
_HostIPContext()().get.return_value = 'fq.dn'
_HostInfoContext()().__getitem__.return_value = 'fq.dn'
self._call_hook('neutron-plugin-relation-joined')
rel_data = {
'metadata-shared-secret': 'secret',
@ -201,13 +203,15 @@ class NeutronOVSHooksTests(CharmTestCase):
)
self.assertTrue(self.install_packages.called)
@patch.object(hooks.neutron_ovs_context, 'HostIPContext')
def test_neutron_plugin_joined_dvr_nodhcp(self, _HostIPContext):
@patch.object(hooks, 'use_fqdn_hint')
@patch.object(hooks.os_context, 'HostInfoContext')
def test_neutron_plugin_joined_dvr_nodhcp(
self, _HostInfoContext, _use_fqdn_hint):
self.enable_nova_metadata.return_value = True
self.enable_local_dhcp.return_value = False
self.use_dvr.return_value = True
self.get_shared_secret.return_value = 'secret'
_HostIPContext()().get.return_value = 'fq.dn'
_HostInfoContext()().__getitem__.return_value = 'fq.dn'
self._call_hook('neutron-plugin-relation-joined')
rel_data = {
'metadata-shared-secret': 'secret',
@ -220,13 +224,15 @@ class NeutronOVSHooksTests(CharmTestCase):
self.purge_packages.assert_called_with(['neutron-dhcp-agent'])
self.assertFalse(self.install_packages.called)
@patch.object(hooks.neutron_ovs_context, 'HostIPContext')
def test_neutron_plugin_joined_nodvr_nodhcp(self, _HostIPContext):
@patch.object(hooks, 'use_fqdn_hint')
@patch.object(hooks.os_context, 'HostInfoContext')
def test_neutron_plugin_joined_nodvr_nodhcp(
self, _HostInfoContext, _use_fqdn_hint):
self.enable_nova_metadata.return_value = False
self.enable_local_dhcp.return_value = False
self.use_dvr.return_value = False
self.get_shared_secret.return_value = 'secret'
_HostIPContext()().get.return_value = 'fq.dn'
_HostInfoContext()().__getitem__.return_value = 'fq.dn'
self._call_hook('neutron-plugin-relation-joined')
rel_data = {
'metadata-shared-secret': None,

7
unit_tests/test_neutron_ovs_utils.py
View File

@ -1138,6 +1138,13 @@ class TestNeutronOVSUtils(CharmTestCase):
_is_container.return_value = True
self.assertEquals(nutils.enable_local_dhcp(), False)
@patch.object(nutils, 'kv')
def test_use_fqdn_hint(self, _kv):
_kv().get.return_value = False
self.assertEquals(nutils.use_fqdn_hint(), False)
_kv().get.return_value = True
self.assertEquals(nutils.use_fqdn_hint(), True)
class TestDPDKBridgeBondMap(CharmTestCase):