openstack/octavia
Code Issues Proposed changes

Fixes Octavia handling of subnets without DHCP

Browse Source 
Currently Octavia assumes that DHCP service is available on
the VIP and member subnets.  This is not the case at all operators.
This patch makes Octavia use the IP information provided when
the ports are created, if available.  If the IP information is
not available on the ports it will fall back to relying on DHCP.

Change-Id: I08a93d4318bbce48128019376320782d1a334369
Closes-Bug: #1607900
This commit is contained in:
Michael Johnson 2016-07-30 23:59:34 +00:00
parent bb9612478b
commit 53ac6823fa
10 changed files with 260 additions and 33 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

83
octavia/amphorae/backends/agent/api_server/plug.py
View File

@ -1,4 +1,5 @@
# Copyright 2015 Hewlett-Packard Development Company, L.P.
# Copyright 2016 Rackspace
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
@ -20,9 +21,12 @@ import stat
import subprocess
import flask
import ipaddress
import jinja2
import netifaces
from oslo_config import cfg
import pyroute2
import six
from werkzeug import exceptions
from octavia.amphorae.backends.agent.api_server import util
@ -30,6 +34,9 @@ from octavia.common import constants as consts
from octavia.i18n import _LE, _LI
CONF = cfg.CONF
CONF.import_group('amphora_agent', 'octavia.common.config')
ETH_PORT_CONF = 'plug_vip_ethX.conf.j2'
ETH_X_VIP_CONF = 'plug_port_ethX.conf.j2'
@ -42,7 +49,7 @@ template_port = j2_env.get_template(ETH_X_VIP_CONF)
template_vip = j2_env.get_template(ETH_PORT_CONF)
def plug_vip(vip, subnet_cidr, gateway, mac_address):
def plug_vip(vip, subnet_cidr, gateway, mac_address, vrrp_ip):
# validate vip
try:
socket.inet_aton(vip)
@ -72,15 +79,25 @@ def plug_vip(vip, subnet_cidr, gateway, mac_address):
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
# mode 00644
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
with os.fdopen(os.open(name, flags, mode), 'w') as file:
file.write('auto lo\n')
file.write('iface lo inet loopback\n')
file.write('source /etc/netns/{}/network/interfaces.d/*.cfg\n'.format(
consts.AMPHORA_NAMESPACE))
with os.fdopen(os.open(name, flags, mode), 'w') as int_file:
int_file.write('auto lo\n')
int_file.write('iface lo inet loopback\n')
if not CONF.amphora_agent.agent_server_network_file:
int_file.write('source /etc/netns/{}/network/'
'interfaces.d/*.cfg\n'.format(
consts.AMPHORA_NAMESPACE))
# write interface file
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
# If we are using a consolidated interfaces file, just append
# otherwise clear the per interface file as we are rewriting it
# TODO(johnsom): We need a way to clean out old interfaces records
if CONF.amphora_agent.agent_server_network_file:
flags = os.O_WRONLY | os.O_CREAT | os.O_APPEND
else:
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
with os.fdopen(os.open(interface_file_path, flags, mode),
'w') as text_file:
@ -89,7 +106,9 @@ def plug_vip(vip, subnet_cidr, gateway, mac_address):
vip=vip,
broadcast=broadcast,
# assume for now only a fixed subnet size
netmask='255.255.255.0')
netmask='255.255.255.0',
gateway=gateway,
vrrp_ip=vrrp_ip)
text_file.write(text)
# Update the list of interfaces to add to the namespace
@ -117,7 +136,7 @@ def plug_vip(vip, subnet_cidr, gateway, mac_address):
vip=vip, interface=interface))), 202)
def plug_network(mac_address):
def plug_network(mac_address, fixed_ips):
# This is the interface as it was initially plugged into the
# default network namespace, this will likely always be eth1
default_netns_interface = _interface_by_mac(mac_address)
@ -138,14 +157,54 @@ def plug_network(mac_address):
interface_file_path = util.get_network_interface_file(netns_interface)
# write interface file
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
# If we are using a consolidated interfaces file, just append
# otherwise clear the per interface file as we are rewriting it
# TODO(johnsom): We need a way to clean out old interfaces records
if CONF.amphora_agent.agent_server_network_file:
flags = os.O_WRONLY | os.O_CREAT | os.O_APPEND
else:
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
# mode 00644
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
with os.fdopen(os.open(interface_file_path, flags, mode),
'w') as text_file:
text = template_port.render(interface=netns_interface)
text_file.write(text)
if fixed_ips is None:
text = template_port.render(interface=netns_interface)
text_file.write(text)
else:
ip_count = -1
for fixed_ip in fixed_ips:
if ip_count == -1:
netns_ip_interface = netns_interface
ip_count += 1
else:
netns_ip_interface = "{int}:{ip}".format(
int=netns_interface, ip=ip_count)
ip_count += 1
try:
ip_addr = fixed_ip['ip_address']
cidr = fixed_ip['subnet_cidr']
ip = ipaddress.ip_address(
ip_addr if six.text_type == type(
ip_addr) else six.u(ip_addr))
network = ipaddress.ip_network(
cidr if six.text_type == type(
cidr) else six.u(cidr))
broadcast = network.broadcast_address.exploded
netmask = (network.prefixlen if ip.version is 6
else network.netmask.exploded)
except ValueError:
return flask.make_response(flask.jsonify(dict(
message="Invalid network IP")), 400)
text = template_port.render(interface=netns_ip_interface,
ipv6=ip.version is 6,
ip_address=ip.exploded,
broadcast=broadcast,
netmask=netmask)
text_file.write(text)
# Update the list of interfaces to add to the namespace
_update_plugged_interfaces_file(netns_interface, mac_address)

6
octavia/amphorae/backends/agent/api_server/server.py
View File

@ -122,7 +122,8 @@ def plug_vip(vip):
return plug.plug_vip(vip,
net_info['subnet_cidr'],
net_info['gateway'],
net_info['mac_address'])
net_info['mac_address'],
net_info.get('vrrp_ip'))
@app.route('/' + api_server.VERSION + '/plug/network', methods=['POST'])
@ -133,7 +134,8 @@ def plug_network():
assert 'mac_address' in port_info
except Exception:
raise exceptions.BadRequest(description='Invalid port information')
return plug.plug_network(port_info['mac_address'])
return plug.plug_network(port_info['mac_address'],
port_info.get('fixed_ips'))
@app.route('/' + api_server.VERSION + '/certificate', methods=['PUT'])

12
octavia/amphorae/backends/agent/api_server/templates/plug_port_ethX.conf.j2
View File

@ -14,5 +14,15 @@
# under the License.
#}
# Generated by Octavia agent
auto {{ interface }} {{ interface }}:0
auto {{ interface }}
{%- if ip_address %}
iface {{ interface }} inet{{ '6' if ipv6 }} static
address {{ ip_address }}
broadcast {{ broadcast }}
netmask {{ netmask }}
{%- else %}
iface {{ interface }} inet dhcp
auto {{ interface }}:0
iface {{ interface }}:0 inet6 auto
{%- endif %}

13
octavia/amphorae/backends/agent/api_server/templates/plug_vip_ethX.conf.j2
View File

@ -1,5 +1,6 @@
{#
# Copyright 2015 Hewlett-Packard Development Company, L.P.
# Copyright 2016 Rackspace
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
@ -15,8 +16,18 @@
#}
# Generated by Octavia agent
auto {{ interface }} {{ interface }}:0
{%- if vrrp_ip %}
iface {{ interface }} inet static
address {{ vrrp_ip }}
broadcast {{ broadcast }}
netmask {{ netmask }}
gateway {{ gateway }}
{%- else %}
iface {{ interface }} inet dhcp
{%- endif %}
iface {{ interface }}:0 inet static
address {{ vip }}
broadcast {{ broadcast }}
netmask {{ netmask }}
netmask {{ netmask }}

14
octavia/amphorae/drivers/haproxy/rest_api_driver.py
View File

@ -123,16 +123,26 @@ class HaproxyAmphoraLoadBalancerDriver(
# tight coupling between the network driver and amphora
# driver. We will need to revisit this to try and remove
# this tight coupling.
# NOTE (johnsom): I am loading the vrrp_ip into the
# net_info structure here so that I don't break
# compatibility with old amphora agent versions.
port = amphorae_network_config.get(amp.id).vrrp_port
net_info = {'subnet_cidr': subnet.cidr,
'gateway': subnet.gateway_ip,
'mac_address': port.mac_address}
'mac_address': port.mac_address,
'vrrp_ip': amp.vrrp_ip}
self.client.plug_vip(amp,
load_balancer.vip.ip_address,
net_info)
def post_network_plug(self, amphora, port):
port_info = {'mac_address': port.mac_address}
fixed_ips = []
for fixed_ip in port.fixed_ips:
ip = {'ip_address': fixed_ip.ip_address,
'subnet_cidr': fixed_ip.subnet.cidr}
fixed_ips.append(ip)
port_info = {'mac_address': port.mac_address,
'fixed_ips': fixed_ips}
self.client.plug_network(amphora, port_info)
def get_vrrp_interface(self, amphora):

111
octavia/tests/functional/amphorae/backend/agent/api_server/test_server.py
View File

@ -552,13 +552,118 @@ class ServerTestCase(base.TestCase):
handle = m()
handle.write.assert_any_call(
'\n# Generated by Octavia agent\n'
'auto eth' + test_int_num + ' eth' + test_int_num +
':0\niface eth' + test_int_num + ' inet dhcp')
'auto eth' + test_int_num +
'\niface eth' + test_int_num + ' inet dhcp\n'
'auto eth' + test_int_num + ':0\n'
'iface eth' + test_int_num + ':0 inet6 auto\n')
mock_check_output.assert_called_with(
['ip', 'netns', 'exec', consts.AMPHORA_NAMESPACE,
'ifup', 'eth' + test_int_num], stderr=-2)
# fixed IPs happy path
port_info = {'mac_address': '123', 'fixed_ips': [
{'ip_address': '10.0.0.5', 'subnet_cidr': '10.0.0.0/24'}]}
mock_interfaces.side_effect = [['blah']]
mock_ifaddress.side_effect = [[netifaces.AF_LINK],
{netifaces.AF_LINK: [{'addr': '123'}]}]
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
file_name = '/etc/netns/{0}/network/interfaces.d/eth{1}.cfg'.format(
consts.AMPHORA_NAMESPACE, test_int_num)
m = self.useFixture(test_utils.OpenFixture(file_name)).mock_open
with mock.patch('os.open') as mock_open, mock.patch.object(
os, 'fdopen', m) as mock_fdopen:
mock_open.return_value = 123
rv = self.app.post('/' + api_server.VERSION + "/plug/network",
content_type='application/json',
data=json.dumps(port_info))
self.assertEqual(202, rv.status_code)
mock_open.assert_any_call(file_name, flags, mode)
mock_fdopen.assert_any_call(123, 'w')
plug_inf_file = '/var/lib/octavia/plugged_interfaces'
flags = os.O_RDWR | os.O_CREAT
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
mock_open.assert_any_call(plug_inf_file, flags, mode)
mock_fdopen.assert_any_call(123, 'r+')
handle = m()
handle.write.assert_any_call(
'\n# Generated by Octavia agent\n'
'auto eth' + test_int_num +
'\niface eth' + test_int_num + ' inet static\n' +
'address 10.0.0.5\nbroadcast 10.0.0.255\n' +
'netmask 255.255.255.0\n')
mock_check_output.assert_called_with(
['ip', 'netns', 'exec', consts.AMPHORA_NAMESPACE,
'ifup', 'eth' + test_int_num], stderr=-2)
# fixed IPs happy path IPv6
port_info = {'mac_address': '123', 'fixed_ips': [
{'ip_address': '2001:db8::2', 'subnet_cidr': '2001:db8::/32'}]}
mock_interfaces.side_effect = [['blah']]
mock_ifaddress.side_effect = [[netifaces.AF_LINK],
{netifaces.AF_LINK: [{'addr': '123'}]}]
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
file_name = '/etc/netns/{0}/network/interfaces.d/eth{1}.cfg'.format(
consts.AMPHORA_NAMESPACE, test_int_num)
m = self.useFixture(test_utils.OpenFixture(file_name)).mock_open
with mock.patch('os.open') as mock_open, mock.patch.object(
os, 'fdopen', m) as mock_fdopen:
mock_open.return_value = 123
rv = self.app.post('/' + api_server.VERSION + "/plug/network",
content_type='application/json',
data=json.dumps(port_info))
self.assertEqual(202, rv.status_code)
mock_open.assert_any_call(file_name, flags, mode)
mock_fdopen.assert_any_call(123, 'w')
plug_inf_file = '/var/lib/octavia/plugged_interfaces'
flags = os.O_RDWR | os.O_CREAT
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
mock_open.assert_any_call(plug_inf_file, flags, mode)
mock_fdopen.assert_any_call(123, 'r+')
handle = m()
handle.write.assert_any_call(
'\n# Generated by Octavia agent\n'
'auto eth' + test_int_num +
'\niface eth' + test_int_num + ' inet6 static\n' +
'address 2001:0db8:0000:0000:0000:0000:0000:0002\n'
'broadcast 2001:0db8:ffff:ffff:ffff:ffff:ffff:ffff\n' +
'netmask 32\n')
mock_check_output.assert_called_with(
['ip', 'netns', 'exec', consts.AMPHORA_NAMESPACE,
'ifup', 'eth' + test_int_num], stderr=-2)
# fixed IPs, bogus IP
port_info = {'mac_address': '123', 'fixed_ips': [
{'ip_address': '10005', 'subnet_cidr': '10.0.0.0/24'}]}
mock_interfaces.side_effect = [['blah']]
mock_ifaddress.side_effect = [[netifaces.AF_LINK],
{netifaces.AF_LINK: [{'addr': '123'}]}]
flags = os.O_WRONLY | os.O_CREAT | os.O_TRUNC
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
file_name = '/etc/netns/{0}/network/interfaces.d/eth{1}.cfg'.format(
consts.AMPHORA_NAMESPACE, test_int_num)
m = self.useFixture(test_utils.OpenFixture(file_name)).mock_open
with mock.patch('os.open') as mock_open, mock.patch.object(
os, 'fdopen', m) as mock_fdopen:
mock_open.return_value = 123
rv = self.app.post('/' + api_server.VERSION + "/plug/network",
content_type='application/json',
data=json.dumps(port_info))
self.assertEqual(400, rv.status_code)
# same as above but ifup fails
port_info = {'mac_address': '123', 'fixed_ips': [
{'ip_address': '10.0.0.5', 'subnet_cidr': '10.0.0.0/24'}]}
mock_interfaces.side_effect = [['blah']]
mock_ifaddress.side_effect = [[netifaces.AF_LINK],
{netifaces.AF_LINK: [{'addr': '123'}]}]
@ -654,7 +759,7 @@ class ServerTestCase(base.TestCase):
handle.write.assert_any_call(
'\n# Generated by Octavia agent\n'
'auto blah blah:0\n'
'iface blah inet dhcp\n'
'iface blah inet dhcp\n\n'
'iface blah:0 inet static\n'
'address 203.0.113.2\n'
'broadcast 203.0.113.255\n'

8
octavia/tests/functional/amphorae/backend/agent/api_server/test_server_sysvinit.py
View File

@ -558,8 +558,10 @@ class ServerTestCase(base.TestCase):
handle = m()
handle.write.assert_any_call(
'\n# Generated by Octavia agent\n'
'auto eth' + test_int_num + ' eth' + test_int_num + ':0\n'
'iface eth' + test_int_num + ' inet dhcp')
'auto eth' + test_int_num + '\n'
'iface eth' + test_int_num + ' inet dhcp\n'
'auto eth' + test_int_num + ':0\n'
'iface eth' + test_int_num + ':0 inet6 auto\n')
mock_check_output.assert_called_with(
['ip', 'netns', 'exec', 'amphora-haproxy', 'ifup',
'eth' + test_int_num], stderr=-2)
@ -660,7 +662,7 @@ class ServerTestCase(base.TestCase):
handle.write.assert_any_call(
'\n# Generated by Octavia agent\n'
'auto blah blah:0\n'
'iface blah inet dhcp\n'
'iface blah inet dhcp\n\n'
'iface blah:0 inet static\n'
'address 203.0.113.2\n'
'broadcast 203.0.113.255\n'

39
octavia/tests/unit/amphorae/drivers/haproxy/test_rest_api_driver.py
View File

@ -32,11 +32,9 @@ FAKE_CIDR = '10.0.0.0/24'
FAKE_GATEWAY = '10.0.0.1'
FAKE_IP = 'fake'
FAKE_PEM_FILENAME = "file_name"
FAKE_SUBNET_INFO = {'subnet_cidr': FAKE_CIDR,
'gateway': FAKE_GATEWAY,
'mac_address': '123'}
FAKE_UUID_1 = uuidutils.generate_uuid()
FAKE_VRRP_IP = '10.1.0.1'
FAKE_MAC_ADDRESS = '123'
class TestHaproxyAmphoraLoadBalancerDriverTest(base.TestCase):
@ -55,7 +53,16 @@ class TestHaproxyAmphoraLoadBalancerDriverTest(base.TestCase):
self.amp = self.sl.load_balancer.amphorae[0]
self.sv = sample_configs.sample_vip_tuple()
self.lb = self.sl.load_balancer
self.port = network_models.Port(mac_address='123')
self.fixed_ip = mock.MagicMock()
self.fixed_ip.ip_address = '10.0.0.5'
self.fixed_ip.subnet.cidr = '10.0.0.0/24'
self.port = network_models.Port(mac_address=FAKE_MAC_ADDRESS,
fixed_ips=[self.fixed_ip])
self.subnet_info = {'subnet_cidr': FAKE_CIDR,
'gateway': FAKE_GATEWAY,
'mac_address': FAKE_MAC_ADDRESS,
'vrrp_ip': self.amp.vrrp_ip}
@mock.patch('octavia.common.tls_utils.cert_parser.load_certificates_data')
@mock.patch('octavia.common.tls_utils.cert_parser.get_host_names')
@ -154,12 +161,23 @@ class TestHaproxyAmphoraLoadBalancerDriverTest(base.TestCase):
amphorae_network_config.get().vrrp_port = self.port
self.driver.post_vip_plug(self.lb, amphorae_network_config)
self.driver.client.plug_vip.assert_called_once_with(
self.amp, self.lb.vip.ip_address, FAKE_SUBNET_INFO)
self.amp, self.lb.vip.ip_address, self.subnet_info)
def test_post_network_plug(self):
# Test dhcp path
port = network_models.Port(mac_address=FAKE_MAC_ADDRESS, fixed_ips=[])
self.driver.post_network_plug(self.amp, port)
self.driver.client.plug_network.assert_called_once_with(
self.amp, dict(mac_address=FAKE_MAC_ADDRESS, fixed_ips=[]))
self.driver.client.plug_network.reset_mock()
# Test fixed IP path
self.driver.post_network_plug(self.amp, self.port)
self.driver.client.plug_network.assert_called_once_with(
self.amp, dict(mac_address='123'))
self.amp, dict(mac_address=FAKE_MAC_ADDRESS,
fixed_ips=[dict(ip_address='10.0.0.5',
subnet_cidr='10.0.0.0/24')]))
def test_get_vrrp_interface(self):
self.driver.get_vrrp_interface(self.amp)
@ -174,11 +192,16 @@ class TestAmphoraAPIClientTest(base.TestCase):
self.driver = driver.AmphoraAPIClient()
self.base_url = "https://127.0.0.1:9443/0.5"
self.amp = models.Amphora(lb_network_ip='127.0.0.1', compute_id='123')
self.port_info = dict(mac_address='123')
self.port_info = dict(mac_address=FAKE_MAC_ADDRESS)
# Override with much lower values for testing purposes..
conf = oslo_fixture.Config(cfg.CONF)
conf.config(group="haproxy_amphora", connection_max_retries=2)
self.subnet_info = {'subnet_cidr': FAKE_CIDR,
'gateway': FAKE_GATEWAY,
'mac_address': FAKE_MAC_ADDRESS,
'vrrp_ip': self.amp.vrrp_ip}
def test_request(self):
self.assertRaises(driver_except.TimeOutException,
self.driver.request,
@ -691,7 +714,7 @@ class TestAmphoraAPIClientTest(base.TestCase):
m.post("{base}/plug/vip/{vip}".format(
base=self.base_url, vip=FAKE_IP)
)
self.driver.plug_vip(self.amp, FAKE_IP, FAKE_SUBNET_INFO)
self.driver.plug_vip(self.amp, FAKE_IP, self.subnet_info)
self.assertTrue(m.called)
@requests_mock.mock()

5
releasenotes/notes/support-networks-without-dhcp-3458a063333ab7a8.yaml Normal file
View File

@ -0,0 +1,5 @@
---
features:
- Adds support for networks that do not have DHCP services enabled.
upgrade:
- To support networks without DHCP you must upgrade your amphora image.

2
requirements.txt
View File

@ -38,5 +38,5 @@ taskflow>=1.26.0 # Apache-2.0
#for the amphora api
Flask!=0.11,<1.0,>=0.10 # BSD
netifaces>=0.10.4 # MIT
ipaddress>=1.0.7;python_version<'3.3' # PSF
cryptography!=1.3.0,>=1.0 # BSD/Apache-2.0