Load Balancing as a Service (LBaaS) for OpenStack
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octavia/octavia/amphorae/backends/agent/api_server/keepalived.py

170 lines
6.8 KiB

# Copyright 2015 Hewlett Packard Enterprise Development Company LP
#
# 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
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
import os
import stat
import subprocess
import flask
import jinja2
from oslo_config import cfg
from oslo_log import log as logging
import webob
from octavia.amphorae.backends.agent.api_server import loadbalancer
from octavia.amphorae.backends.agent.api_server import util
from octavia.common import constants as consts
BUFFER = 100
CONF = cfg.CONF
LOG = logging.getLogger(__name__)
j2_env = jinja2.Environment(autoescape=True, loader=jinja2.FileSystemLoader(
os.path.dirname(os.path.realpath(__file__)) + consts.AGENT_API_TEMPLATES))
UPSTART_TEMPLATE = j2_env.get_template(consts.KEEPALIVED_JINJA2_UPSTART)
SYSVINIT_TEMPLATE = j2_env.get_template(consts.KEEPALIVED_JINJA2_SYSVINIT)
SYSTEMD_TEMPLATE = j2_env.get_template(consts.KEEPALIVED_JINJA2_SYSTEMD)
check_script_template = j2_env.get_template(consts.CHECK_SCRIPT_CONF)
class Keepalived(object):
def upload_keepalived_config(self):
stream = loadbalancer.Wrapped(flask.request.stream)
if not os.path.exists(util.keepalived_dir()):
os.makedirs(util.keepalived_dir())
os.makedirs(util.keepalived_check_scripts_dir())
conf_file = util.keepalived_cfg_path()
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(conf_file, flags, mode), 'wb') as f:
b = stream.read(BUFFER)
while b:
f.write(b)
b = stream.read(BUFFER)
init_system = util.get_os_init_system()
file_path = util.keepalived_init_path(init_system)
if init_system == consts.INIT_SYSTEMD:
template = SYSTEMD_TEMPLATE
init_enable_cmd = "systemctl enable octavia-keepalived"
# Render and install the network namespace systemd service
util.install_netns_systemd_service()
util.run_systemctl_command(
consts.ENABLE, consts.AMP_NETNS_SVC_PREFIX)
elif init_system == consts.INIT_UPSTART:
template = UPSTART_TEMPLATE
elif init_system == consts.INIT_SYSVINIT:
template = SYSVINIT_TEMPLATE
init_enable_cmd = "insserv {file}".format(file=file_path)
else:
raise util.UnknownInitError()
if init_system == consts.INIT_SYSTEMD:
# mode 00644
mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
else:
# mode 00755
mode = (stat.S_IRWXU | stat.S_IRGRP | stat.S_IXGRP |
stat.S_IROTH | stat.S_IXOTH)
if not os.path.exists(file_path):
with os.fdopen(os.open(file_path, flags, mode), 'w') as text_file:
text = template.render(
keepalived_pid=util.keepalived_pid_path(),
keepalived_cmd=consts.KEEPALIVED_CMD,
keepalived_cfg=util.keepalived_cfg_path(),
keepalived_log=util.keepalived_log_path(),
amphora_nsname=consts.AMPHORA_NAMESPACE,
amphora_netns=consts.AMP_NETNS_SVC_PREFIX,
administrative_log_facility=(
CONF.amphora_agent.administrative_log_facility),
)
text_file.write(text)
# Renders the Keepalived check script
keepalived_path = util.keepalived_check_script_path()
# mode 00755
mode = (stat.S_IRWXU | stat.S_IRGRP | stat.S_IXGRP |
stat.S_IROTH | stat.S_IXOTH)
open_obj = os.open(keepalived_path, flags, mode)
with os.fdopen(open_obj, 'w') as text_file:
text = check_script_template.render(
check_scripts_dir=util.keepalived_check_scripts_dir()
)
text_file.write(text)
# Make sure the new service is enabled on boot
if init_system != consts.INIT_UPSTART:
try:
subprocess.check_output(init_enable_cmd.split(),
stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
LOG.debug('Failed to enable octavia-keepalived service: '
'%(err)s %(output)s', {'err': e, 'output': e.output})
return webob.Response(json=dict(
message="Error enabling octavia-keepalived service",
details=e.output), status=500)
res = webob.Response(json={'message': 'OK'}, status=200)
res.headers['ETag'] = stream.get_md5()
return res
def manager_keepalived_service(self, action):
action = action.lower()
if action not in [consts.AMP_ACTION_START,
consts.AMP_ACTION_STOP,
consts.AMP_ACTION_RELOAD]:
return webob.Response(json=dict(
message='Invalid Request',
details="Unknown action: {0}".format(action)), status=400)
if action == consts.AMP_ACTION_START:
keepalived_pid_path = util.keepalived_pid_path()
try:
# Is there a pid file for keepalived?
with open(keepalived_pid_path, 'r') as pid_file:
pid = int(pid_file.readline())
os.kill(pid, 0)
# If we got here, it means the keepalived process is running.
# We should reload it instead of trying to start it again.
action = consts.AMP_ACTION_RELOAD
except (IOError, OSError):
pass
cmd = ("/usr/sbin/service octavia-keepalived {action}".format(
action=action))
try:
subprocess.check_output(cmd.split(), stderr=subprocess.STDOUT)
except subprocess.CalledProcessError as e:
LOG.debug('Failed to %s octavia-keepalived service: %s %s',
action, e, e.output)
return webob.Response(json=dict(
message="Failed to {0} octavia-keepalived service".format(
action), details=e.output), status=500)
return webob.Response(
json=dict(message='OK',
details='keepalived {action}ed'.format(action=action)),
status=202)