# octavia.amphorae.backends.agent.api_server.keepalived

# 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))
    SYSTEMD_TEMPLATE = j2_env.get_template(consts.KEEPALIVED_JINJA2_SYSTEMD)
    check_script_template = j2_env.get_template(consts.CHECK_SCRIPT_CONF)

    class Keepalived:

        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)

            file_path = util.keepalived_init_path()

            template = SYSTEMD_TEMPLATE

            # Render and install the network namespace systemd service
            util.install_netns_systemd_service()
            util.run_systemctl_command(
                consts.ENABLE, consts.AMP_NETNS_SVC_PREFIX, False)

            # mode 00644
            mode = stat.S_IRUSR | stat.S_IWUSR | stat.S_IRGRP | stat.S_IROTH
            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
            try:
                util.run_systemctl_command(consts.ENABLE,
                                           consts.KEEPALIVED_SYSTEMD)
            except subprocess.CalledProcessError as e:
                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

        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': f"Unknown action: {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, 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 OSError:
                    pass

            try:
                util.run_systemctl_command(action,
                                           consts.KEEPALIVED_SYSTEMD)
            except subprocess.CalledProcessError as e:
                return webob.Response(json={
                    'message': f"Failed to {action} octavia-keepalived service",
                    'details': e.output}, status=500)

            return webob.Response(
                json={'message': 'OK',
                      'details': f'keepalived {action}ed'},
                status=202)

this page last updated: 2025-04-03 17:35:57

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