root / ganeti / hooks.py @ 737b0e28
History | View | Annotate | Download (7.8 kB)
1 |
#!/usr/bin/env python
|
---|---|
2 |
#
|
3 |
# -*- coding: utf-8 -*-
|
4 |
#
|
5 |
# Copyright 2011 GRNET S.A. All rights reserved.
|
6 |
#
|
7 |
# Redistribution and use in source and binary forms, with or
|
8 |
# without modification, are permitted provided that the following
|
9 |
# conditions are met:
|
10 |
#
|
11 |
# 1. Redistributions of source code must retain the above
|
12 |
# copyright notice, this list of conditions and the following
|
13 |
# disclaimer.
|
14 |
#
|
15 |
# 2. Redistributions in binary form must reproduce the above
|
16 |
# copyright notice, this list of conditions and the following
|
17 |
# disclaimer in the documentation and/or other materials
|
18 |
# provided with the distribution.
|
19 |
#
|
20 |
# THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
|
21 |
# OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
22 |
# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
23 |
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
|
24 |
# CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
25 |
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
26 |
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
|
27 |
# USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
|
28 |
# AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
29 |
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
|
30 |
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
31 |
# POSSIBILITY OF SUCH DAMAGE.
|
32 |
#
|
33 |
# The views and conclusions contained in the software and
|
34 |
# documentation are those of the authors and should not be
|
35 |
# interpreted as representing official policies, either expressed
|
36 |
# or implied, of GRNET S.A.
|
37 |
#
|
38 |
"""Ganeti hooks for Synnefo
|
39 |
|
40 |
These are the individual Ganeti hooks for Synnefo.
|
41 |
|
42 |
"""
|
43 |
|
44 |
import sys |
45 |
import os |
46 |
|
47 |
import time |
48 |
import json |
49 |
import socket |
50 |
import logging |
51 |
|
52 |
from amqplib import client_0_8 as amqp |
53 |
|
54 |
from synnefo.util.mac2eui64 import mac2eui64 |
55 |
import synnefo.settings as settings |
56 |
|
57 |
def ganeti_net_status(logger, environ): |
58 |
"""Produce notifications of type 'Ganeti-net-status'
|
59 |
|
60 |
Process all GANETI_INSTANCE_NICx_y environment variables,
|
61 |
where x is the NIC index, starting at 0,
|
62 |
and y is one of "MAC", "IP", "BRIDGE".
|
63 |
|
64 |
The result is returned as a single notification message
|
65 |
of type 'ganeti-net-status', detailing the NIC configuration
|
66 |
of a Ganeti instance.
|
67 |
|
68 |
"""
|
69 |
nics = {} |
70 |
|
71 |
key_to_attr = { 'IP': 'ip', 'MAC': 'mac', 'BRIDGE': 'link' } |
72 |
|
73 |
for env in environ.keys(): |
74 |
if env.startswith("GANETI_INSTANCE_NIC"): |
75 |
s = env.replace("GANETI_INSTANCE_NIC", "").split('_', 1) |
76 |
if len(s) == 2 and s[0].isdigit() and s[1] in ('MAC', 'IP', 'BRIDGE'): |
77 |
index = int(s[0]) |
78 |
key = key_to_attr[s[1]]
|
79 |
|
80 |
if nics.has_key(index):
|
81 |
nics[index][key] = environ[env] |
82 |
else:
|
83 |
nics[index] = { key: environ[env] } |
84 |
|
85 |
# IPv6 support:
|
86 |
#
|
87 |
# The IPv6 of NIC with index 0 [the public NIC]
|
88 |
# is derived using an EUI64 scheme.
|
89 |
if index == 0 and key == 'mac': |
90 |
nics[0]['ipv6'] = mac2eui64(nics[0]['mac'], |
91 |
settings.PUBLIC_IPV6_PREFIX) |
92 |
|
93 |
# Amend notification with firewall settings
|
94 |
tags = environ.get('GANETI_INSTANCE_TAGS', '') |
95 |
for tag in tags.split(' '): |
96 |
t = tag.split(':')
|
97 |
if t[0:2] == ['synnefo', 'network']: |
98 |
if len(t) != 4: |
99 |
logger.error("Malformed synnefo tag %s", tag)
|
100 |
continue
|
101 |
try:
|
102 |
index = int(t[2]) |
103 |
nics[index]['firewall'] = t[3] |
104 |
except ValueError: |
105 |
logger.error("Malformed synnefo tag %s", tag)
|
106 |
except KeyError: |
107 |
logger.error("Found tag %s for non-existent NIC %d",
|
108 |
tag, index) |
109 |
|
110 |
# Verify our findings are consistent with the Ganeti environment
|
111 |
indexes = list(nics.keys())
|
112 |
ganeti_nic_count = int(environ['GANETI_INSTANCE_NIC_COUNT']) |
113 |
if len(indexes) != ganeti_nic_count: |
114 |
logger.error("I have %d NICs, Ganeti says number of NICs is %d",
|
115 |
len(indexes), ganeti_nic_count)
|
116 |
raise Exception("Inconsistent number of NICs in Ganeti environment") |
117 |
|
118 |
if indexes != range(0, len(indexes)): |
119 |
logger.error("Ganeti NIC indexes are not consecutive starting at zero.");
|
120 |
logger.error("NIC indexes are: %s. Environment is: %s", indexes, environ)
|
121 |
raise Exception("Unexpected inconsistency in the Ganeti environment") |
122 |
|
123 |
# Construct the notification
|
124 |
instance = environ['GANETI_INSTANCE_NAME']
|
125 |
|
126 |
nics_list = [] |
127 |
for i in indexes: |
128 |
nics_list.append(nics[i]) |
129 |
|
130 |
msg = { |
131 |
"type": "ganeti-net-status", |
132 |
"instance": instance,
|
133 |
"nics": nics_list
|
134 |
} |
135 |
|
136 |
return msg
|
137 |
|
138 |
|
139 |
class GanetiHook(): |
140 |
def __init__(self, logger, environ, instance, prefix): |
141 |
self.logger = logger
|
142 |
self.environ = environ
|
143 |
self.instance = instance
|
144 |
self.prefix = prefix
|
145 |
|
146 |
def on_master(self): |
147 |
"""Return True if running on the Ganeti master"""
|
148 |
return socket.getfqdn() == self.environ['GANETI_MASTER'] |
149 |
|
150 |
def publish_msgs(self, msgs): |
151 |
for (msgtype, msg) in msgs: |
152 |
routekey = "ganeti.%s.event.%s" % (self.prefix, msgtype) |
153 |
self.logger.debug("Pushing message to RabbitMQ: %s (key = %s)", |
154 |
json.dumps(msg), routekey) |
155 |
msg = amqp.Message(json.dumps(msg)) |
156 |
msg.properties["delivery_mode"] = 2 # Persistent |
157 |
|
158 |
# Retry up to five times to open a channel to RabbitMQ.
|
159 |
# The hook needs to abort if this count is exceeded, because it
|
160 |
# runs synchronously with VM creation inside Ganeti, and may only
|
161 |
# run for a finite amount of time.
|
162 |
#
|
163 |
# FIXME: We need a reconciliation mechanism between the DB and
|
164 |
# Ganeti, for cases exactly like this.
|
165 |
conn = None
|
166 |
sent = False
|
167 |
retry = 0
|
168 |
while not sent and retry < 5: |
169 |
self.logger.debug("Attempting to publish to RabbitMQ at %s", |
170 |
settings.RABBIT_HOST) |
171 |
try:
|
172 |
if not conn: |
173 |
conn = amqp.Connection(host=settings.RABBIT_HOST, |
174 |
userid=settings.RABBIT_USERNAME, |
175 |
password=settings.RABBIT_PASSWORD, |
176 |
virtual_host=settings.RABBIT_VHOST) |
177 |
chann = conn.channel() |
178 |
self.logger.debug("Successfully connected to RabbitMQ at %s", |
179 |
settings.RABBIT_HOST) |
180 |
|
181 |
chann.basic_publish(msg, |
182 |
exchange=settings.EXCHANGE_GANETI, |
183 |
routing_key=routekey) |
184 |
sent = True
|
185 |
self.logger.debug("Successfully sent message to RabbitMQ") |
186 |
except socket.error:
|
187 |
conn = False
|
188 |
retry += 1
|
189 |
self.logger.exception("Publish to RabbitMQ failed, retry=%d in 1s", |
190 |
retry) |
191 |
time.sleep(1)
|
192 |
|
193 |
if not sent: |
194 |
raise Exception("Publish to RabbitMQ failed after %d tries, aborting" % retry) |
195 |
|
196 |
|
197 |
class PostStartHook(GanetiHook): |
198 |
"""Post-instance-startup Ganeti Hook.
|
199 |
|
200 |
Produce notifications to the rest of the Synnefo
|
201 |
infrastructure in the post-instance-start phase of Ganeti.
|
202 |
|
203 |
Currently, this list only contains a single message,
|
204 |
detailing the net configuration of an instance.
|
205 |
|
206 |
This hook only runs on the Ganeti master.
|
207 |
|
208 |
"""
|
209 |
def run(self): |
210 |
if self.on_master(): |
211 |
notifs = [] |
212 |
notifs.append(("net", ganeti_net_status(self.logger, self.environ))) |
213 |
|
214 |
self.publish_msgs(notifs)
|
215 |
|
216 |
return 0 |
217 |
|
218 |
|
219 |
class PostStopHook(GanetiHook): |
220 |
def run(self): |
221 |
return 0 |
222 |
|