Source code for octavia.amphorae.backends.agent.api_server.keepalived

# 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)


[docs] class Keepalived(object):
[docs] def upload_keepalived_config(self): stream = loadbalancer.Wrapped(flask.request.stream) if not os.path.exists(util.keepalived_dir()): os.makedirs(util.keepalived_dir()) if not os.path.exists(util.keepalived_check_scripts_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) # Configure the monitoring of haproxy util.vrrp_check_script_update(None, consts.AMP_ACTION_START) # 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={ '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
[docs] 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={ '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', encoding='utf-8') 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={ 'message': "Failed to {0} octavia-keepalived service".format( action), 'details': e.output}, status=500) return webob.Response( json={'message': 'OK', 'details': 'keepalived {action}ed'.format(action=action)}, status=202)