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

# Copyright 2017 Red Hat, Inc. All rights reserved.
#
# 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 subprocess

import distro
from oslo_config import cfg
from oslo_log import log as logging
import webob
from werkzeug import exceptions

from octavia.amphorae.backends.utils import interface_file
from octavia.common import constants as consts
from octavia.common import exceptions as octavia_exceptions

CONF = cfg.CONF

LOG = logging.getLogger(__name__)


[docs]class BaseOS(object): def __init__(self, os_name): self.os_name = os_name self.package_name_map = {} @classmethod def _get_subclasses(cls): for subclass in cls.__subclasses__(): for sc in subclass._get_subclasses(): yield sc yield subclass
[docs] @classmethod def get_os_util(cls): os_name = distro.id() for subclass in cls._get_subclasses(): if subclass.is_os_name(os_name): return subclass(os_name) raise octavia_exceptions.InvalidAmphoraOperatingSystem(os_name=os_name)
def _map_package_name(self, package_name): return self.package_name_map.get(package_name, package_name)
[docs] def write_interface_file(self, interface, ip_address, prefixlen): interface = interface_file.InterfaceFile( name=interface, addresses=[{ "address": ip_address, "prefixlen": prefixlen }] ) interface.write()
[docs] def write_vip_interface_file(self, interface, vip, ip_version, prefixlen, gateway, mtu, vrrp_ip, host_routes): vip_interface = interface_file.VIPInterfaceFile( name=interface, mtu=mtu, vip=vip, ip_version=ip_version, prefixlen=prefixlen, gateway=gateway, vrrp_ip=vrrp_ip, host_routes=host_routes, topology=CONF.controller_worker.loadbalancer_topology) vip_interface.write()
[docs] def write_port_interface_file(self, interface, fixed_ips, mtu): port_interface = interface_file.PortInterfaceFile( name=interface, mtu=mtu, fixed_ips=fixed_ips) port_interface.write()
@classmethod def _bring_if_up(cls, interface, what): cmd = ("ip netns exec {ns} amphora-interface up {params}".format( ns=consts.AMPHORA_NAMESPACE, params=interface)) LOG.debug("Executing: %s", cmd) try: out = subprocess.check_output(cmd.split(), stderr=subprocess.STDOUT) LOG.debug(out) except subprocess.CalledProcessError as e: LOG.error('Failed to set up %s due to error: %s %s', interface, e, e.output) raise exceptions.HTTPException( response=webob.Response(json=dict( message='Error plugging {0}'.format(what), details=e.output), status=500)) @classmethod def _bring_if_down(cls, interface): cmd = ("ip netns exec {ns} amphora-interface down {params}".format( ns=consts.AMPHORA_NAMESPACE, params=interface)) LOG.debug("Executing: %s", cmd) try: subprocess.check_output(cmd.split(), stderr=subprocess.STDOUT) except subprocess.CalledProcessError as e: LOG.info('Ignoring failure to set %s down due to error: %s %s', interface, e, e.output)
[docs] @classmethod def bring_interfaces_up(cls, ip, primary_interface): cls._bring_if_down(primary_interface) cls._bring_if_up(primary_interface, 'VIP')
[docs]class Ubuntu(BaseOS):
[docs] @classmethod def is_os_name(cls, os_name): return os_name in ['ubuntu']
[docs] def cmd_get_version_of_installed_package(self, package_name): name = self._map_package_name(package_name) return "dpkg-query -W -f=${{Version}} {name}".format(name=name)
[docs]class RH(BaseOS):
[docs] @classmethod def is_os_name(cls, os_name): return os_name in ['fedora', 'rhel']
[docs] def cmd_get_version_of_installed_package(self, package_name): name = self._map_package_name(package_name) return "rpm -q --queryformat %{{VERSION}} {name}".format(name=name)
[docs]class CentOS(RH): def __init__(self, os_name): super().__init__(os_name) if distro.version() == '7': self.package_name_map.update({'haproxy': 'haproxy18'})
[docs] @classmethod def is_os_name(cls, os_name): return os_name in ['centos']