437 lines
16 KiB
Python
437 lines
16 KiB
Python
# Copyright(c) 2016 Nippon Telegraph and Telephone Corporation
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import socket
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import eventlet
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from oslo_log import log as oslo_logging
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from oslo_utils import timeutils
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import masakarimonitors.conf
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from masakarimonitors.ha import masakari
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import masakarimonitors.hostmonitor.host_handler.driver as driver
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from masakarimonitors.hostmonitor.host_handler import hold_host_status
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from masakarimonitors.hostmonitor.host_handler import parse_cib_xml
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from masakarimonitors.hostmonitor.host_handler import parse_crmmon_xml
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from masakarimonitors.objects import event_constants as ec
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from masakarimonitors import utils
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LOG = oslo_logging.getLogger(__name__)
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CONF = masakarimonitors.conf.CONF
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class CibSchemaCompliantTag(dict):
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"""Create a dict which has the same attributes as a cib node tag.
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Given a crm node tag convert it to a dict with corresponding cib tag
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attributes.
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"""
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def __init__(self, crmon_entry):
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self['uname'] = crmon_entry.get('name')
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online = crmon_entry.get('online')
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self['crmd'] = 'online' if online == 'true' else 'offline'
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class HandleHost(driver.DriverBase):
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"""Handle hosts.
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This class handles the host status.
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"""
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def __init__(self):
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super(HandleHost, self).__init__()
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self.my_hostname = socket.gethostname()
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self.xml_parser = parse_cib_xml.ParseCibXml()
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self.crmmon_xml_parser = parse_crmmon_xml.ParseCrmMonXml()
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self.status_holder = hold_host_status.HostHoldStatus()
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self.notifier = masakari.SendNotification()
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def _check_pacemaker_services(self, target_service):
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try:
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cmd_str = 'systemctl status ' + target_service
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command = cmd_str.split(' ')
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# Execute command.
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out, err = utils.execute(*command, run_as_root=True)
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if err:
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raise Exception
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return True
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except Exception:
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return False
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def _check_hb_line(self):
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"""Check whether the corosync communication is normal.
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:returns: 0 if normal, 1 if abnormal, 2 if configuration file is
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wrong or neither pacemaker nor pacemaker-remote is running.
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"""
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# Check whether the pacemaker services is normal.
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corosync_status = self._check_pacemaker_services('corosync')
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pacemaker_status = self._check_pacemaker_services('pacemaker')
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pacemaker_remote_status = self._check_pacemaker_services(
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'pacemaker_remote')
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if corosync_status is False or pacemaker_status is False:
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if pacemaker_remote_status is False:
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LOG.error(
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"Neither pacemaker nor pacemaker-remote is running.")
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return 2
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else:
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LOG.info("Works on pacemaker-remote.")
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return 0
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# Check whether the neccesary parameters are set.
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if CONF.host.corosync_multicast_interfaces is None or \
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CONF.host.corosync_multicast_ports is None:
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msg = ("corosync_multicast_interfaces or "
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"corosync_multicast_ports is not set.")
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LOG.error("%s", msg)
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return 2
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# Check whether the corosync communication is normal.
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corosync_multicast_interfaces = \
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CONF.host.corosync_multicast_interfaces.split(',')
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corosync_multicast_ports = \
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CONF.host.corosync_multicast_ports.split(',')
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if len(corosync_multicast_interfaces) != len(corosync_multicast_ports):
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msg = ("Incorrect parameters corosync_multicast_interfaces or "
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"corosync_multicast_ports.")
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LOG.error("%s", msg)
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return 2
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is_nic_normal = False
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for num in range(0, len(corosync_multicast_interfaces)):
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cmd_str = ("timeout %s tcpdump -n -c 1 -p -i %s port %s") \
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% (CONF.host.tcpdump_timeout,
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corosync_multicast_interfaces[num],
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corosync_multicast_ports[num])
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command = cmd_str.split(' ')
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try:
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# Execute tcpdump command.
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out, err = utils.execute(*command, run_as_root=True)
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# If command doesn't raise exception, nic is normal.
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msg = ("Corosync communication using '%s' is normal.") \
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% corosync_multicast_interfaces[num]
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LOG.info("%s", msg)
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is_nic_normal = True
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break
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except Exception:
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msg = ("Corosync communication using '%s' is failed.") \
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% corosync_multicast_interfaces[num]
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LOG.warning("%s", msg)
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if is_nic_normal is False:
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LOG.error("Corosync communication is failed.")
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return 1
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return 0
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def _check_host_status_by_crmadmin(self):
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try:
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# Execute crmadmin command.
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out, err = utils.execute('crmadmin', '-S', self.my_hostname,
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run_as_root=True)
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if err:
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msg = ("crmadmin command output stderr: %s") % err
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raise Exception(msg)
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# If own host is stable status, crmadmin outputs
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# 'S_IDLE' or 'S_NOT_DC'
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if 'S_IDLE' in out or 'S_NOT_DC' in out:
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return 0
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else:
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raise Exception(
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"crmadmin command output unexpected host status.")
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except Exception as e:
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LOG.warning("Exception caught: %s", e)
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LOG.warning("'%s' is unstable state on cluster.",
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self.my_hostname)
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return 1
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def _get_cib_xml(self):
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try:
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# Execute cibadmin command.
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out, err = utils.execute('cibadmin', '--query', run_as_root=True)
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if err:
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msg = ("cibadmin command output stderr: %s") % err
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raise Exception(msg)
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except Exception as e:
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LOG.warning("Exception caught: %s", e)
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return
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return out
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def _get_crmmon_xml(self):
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"""Get summary of cluster's current state in XML format."""
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try:
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# Execute crm_mon command.
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out, err = utils.execute('crm_mon', '-X', run_as_root=True)
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if err:
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msg = ("crmmon command output stderr: %s") % err
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raise Exception(msg)
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except Exception as e:
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LOG.warning("Exception caught: %s", e)
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return
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return out
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def _is_poweroff(self, hostname):
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ipmi_values = self.xml_parser.get_stonith_ipmi_params(hostname)
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if ipmi_values is None:
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LOG.error("Failed to get params of ipmi RA.")
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return False
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cmd_str = ("timeout %s ipmitool -U %s -P %s -I %s -H %s "
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"power status") \
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% (str(CONF.host.ipmi_timeout), ipmi_values['userid'],
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ipmi_values['passwd'], ipmi_values['interface'],
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ipmi_values['ipaddr'])
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command = cmd_str.split(' ')
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retry_count = 0
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while True:
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try:
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# Execute ipmitool command.
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out, err = utils.execute(*command, run_as_root=False)
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if err:
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msg = ("ipmitool command output stderr: %s") % err
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raise Exception(msg)
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msg = ("ipmitool command output stdout: %s") % out
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if 'Power is off' in out:
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LOG.info("%s", msg)
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return True
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else:
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raise Exception(msg)
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except Exception as e:
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if retry_count < CONF.host.ipmi_retry_max:
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LOG.warning("Retry executing ipmitool command. (%s)", e)
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retry_count = retry_count + 1
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eventlet.greenthread.sleep(CONF.host.ipmi_retry_interval)
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else:
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LOG.error("Exception caught: %s", e)
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return False
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def _make_event(self, hostname, current_status):
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if current_status == 'online':
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# Set values that host has started.
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event_type = ec.EventConstants.EVENT_STARTED
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cluster_status = current_status.upper()
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host_status = ec.EventConstants.HOST_STATUS_NORMAL
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else:
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# Set values that host has stopped.
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event_type = ec.EventConstants.EVENT_STOPPED
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cluster_status = current_status.upper()
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if not CONF.host.disable_ipmi_check:
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if self._is_poweroff(hostname):
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# Set value that host status is normal.
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host_status = ec.EventConstants.HOST_STATUS_NORMAL
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else:
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# Set value that host status is unknown.
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host_status = ec.EventConstants.HOST_STATUS_UNKNOWN
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else:
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# Set value that host status is normal.
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host_status = ec.EventConstants.HOST_STATUS_NORMAL
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current_time = timeutils.utcnow()
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event = {
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'notification': {
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'type': ec.EventConstants.TYPE_COMPUTE_HOST,
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'hostname': hostname,
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'generated_time': current_time,
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'payload': {
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'event': event_type,
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'cluster_status': cluster_status,
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'host_status': host_status
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}
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}
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}
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return event
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def _check_if_status_changed(self, node_state_tag_list):
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# Check if host status changed.
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for node_state_tag in node_state_tag_list:
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# hostmonitor doesn't monitor itself.
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if node_state_tag.get('uname') == self.my_hostname:
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continue
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# Get current status and old status.
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current_status = node_state_tag.get('crmd')
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old_status = self.status_holder.get_host_status(
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node_state_tag.get('uname'))
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# If old_status is None, This is first get of host status.
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if old_status is None:
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msg = ("Recognized '%s' as a new member of cluster."
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" Host status is '%s'.") \
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% (node_state_tag.get('uname'), current_status)
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LOG.info("%s", msg)
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self.status_holder.set_host_status(node_state_tag)
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continue
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# Output host status.
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msg = ("'%s' is '%s'.") % (node_state_tag.get('uname'),
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current_status)
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LOG.info("%s", msg)
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# If host status changed, send a notification.
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if current_status != old_status:
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if current_status != 'online' and current_status != 'offline':
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# If current_status is not 'online' or 'offline',
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# hostmonitor doesn't send a notification.
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msg = ("Since host status is '%s',"
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" hostmonitor doesn't send a notification.") \
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% current_status
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LOG.info("%s", msg)
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else:
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event = self._make_event(node_state_tag.get('uname'),
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current_status)
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# Send a notification.
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self.notifier.send_notification(
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CONF.host.api_retry_max,
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CONF.host.api_retry_interval,
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event)
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# Update host status.
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self.status_holder.set_host_status(node_state_tag)
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def _check_host_status_by_crm_mon(self):
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crmmon_xml = self._get_crmmon_xml()
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if crmmon_xml is None:
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# crm_mon command failure.
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return 1
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# Set to the ParseCrmMonXml object.
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self.crmmon_xml_parser.set_crmmon_xml(crmmon_xml)
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# Get node_state tag list.
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node_state_tag_list = self.crmmon_xml_parser.get_node_state_tag_list()
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if len(node_state_tag_list) == 0:
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# If crmmon xml doesn't have node_state tag,
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# it is an unexpected result.
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raise Exception(
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"Failed to get nodes tag from crm_mon xml.")
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node_state_tag_list = [CibSchemaCompliantTag(n)
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for n in node_state_tag_list
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if n.get('type') == 'remote']
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# Check if status changed.
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self._check_if_status_changed(node_state_tag_list)
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return 0
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def _check_host_status_by_cibadmin(self):
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# Get xml of cib info.
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cib_xml = self._get_cib_xml()
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if cib_xml is None:
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# cibadmin command failure.
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return 1
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# Set to the ParseCibXml object.
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self.xml_parser.set_cib_xml(cib_xml)
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# Check if pacemaker cluster have quorum.
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if self.xml_parser.have_quorum() == 0:
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msg = "Pacemaker cluster doesn't have quorum."
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LOG.warning("%s", msg)
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# Get node_state tag list.
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node_state_tag_list = self.xml_parser.get_node_state_tag_list()
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if len(node_state_tag_list) == 0:
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# If cib xml doesn't have node_state tag,
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# it is an unexpected result.
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raise Exception(
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"Failed to get node_state tag from cib xml.")
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# Check if status changed.
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self._check_if_status_changed(node_state_tag_list)
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return 0
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def stop(self):
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self.running = False
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def monitor_hosts(self):
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"""Host monitoring main method.
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This method monitors hosts.
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"""
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try:
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self.running = True
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while self.running:
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# Check whether corosync communication between hosts
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# is normal.
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ret = self._check_hb_line()
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if ret == 1:
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# Because my host may be fenced by stonith due to split
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# brain condition, sleep for a certain time.
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eventlet.greenthread.sleep(CONF.host.stonith_wait)
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elif ret == 2:
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LOG.warning("hostmonitor skips monitoring hosts.")
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eventlet.greenthread.sleep(CONF.host.monitoring_interval)
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continue
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# Check the host status is stable or unstable by crmadmin.
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# It only checks when this process runs on the full cluster
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# stack of corosync.
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pacemaker_remote_status = self._check_pacemaker_services(
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'pacemaker_remote')
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if pacemaker_remote_status is False:
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if self._check_host_status_by_crmadmin() != 0:
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LOG.warning("hostmonitor skips monitoring hosts.")
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eventlet.greenthread.sleep(
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CONF.host.monitoring_interval)
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continue
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# Check the host status is online or offline.
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if CONF.host.restrict_to_remotes:
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status_func = self._check_host_status_by_crm_mon
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else:
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status_func = self._check_host_status_by_cibadmin
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if status_func() != 0:
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LOG.warning("hostmonitor skips monitoring hosts.")
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eventlet.greenthread.sleep(CONF.host.monitoring_interval)
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continue
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eventlet.greenthread.sleep(CONF.host.monitoring_interval)
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except Exception as e:
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LOG.exception("Exception caught: %s", e)
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return
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