715 lines
33 KiB
Python
715 lines
33 KiB
Python
#!/usr/bin/env python3
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# NodeInstance.py - Class implementing a PVC node in pvcd
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2020 Joshua M. Boniface <joshua@boniface.me>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <https://www.gnu.org/licenses/>.
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#
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###############################################################################
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import os
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import sys
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import psutil
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import socket
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import time
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import libvirt
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import threading
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import pvcd.log as log
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import pvcd.zkhandler as zkhandler
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import pvcd.common as common
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class NodeInstance(object):
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# Initialization function
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def __init__(self, name, this_node, zk_conn, config, logger, d_node, d_network, d_domain, dns_aggregator, metadata_api):
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# Passed-in variables on creation
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self.name = name
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self.this_node = this_node
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self.zk_conn = zk_conn
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self.config = config
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self.logger = logger
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# Which node is primary
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self.primary_node = None
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# States
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self.daemon_mode = zkhandler.readdata(self.zk_conn, '/nodes/{}/daemonmode'.format(self.name))
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self.daemon_state = 'stop'
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self.router_state = 'client'
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self.domain_state = 'ready'
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# Object lists
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self.d_node = d_node
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self.d_network = d_network
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self.d_domain = d_domain
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self.dns_aggregator = dns_aggregator
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self.metadata_api = metadata_api
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# Printable lists
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self.active_node_list = []
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self.flushed_node_list = []
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self.inactive_node_list = []
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self.network_list = []
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self.domain_list = []
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# Node resources
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self.domains_count = 0
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self.memused = 0
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self.memfree = 0
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self.memalloc = 0
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self.vcpualloc = 0
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# Floating IP configurations
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if self.config['enable_networking']:
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self.vni_dev = self.config['vni_dev']
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self.vni_ipaddr, self.vni_cidrnetmask = self.config['vni_floating_ip'].split('/')
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self.upstream_dev = self.config['upstream_dev']
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self.upstream_ipaddr, self.upstream_cidrnetmask = self.config['upstream_floating_ip'].split('/')
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else:
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self.vni_dev = None
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self.vni_ipaddr = None
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self.vni_cidrnetmask = None
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self.upstream_dev = None
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self.upstream_ipaddr = None
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self.upstream_cidrnetmask = None
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# Threads
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self.flush_thread = None
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# Flags
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self.flush_stopper = False
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# Zookeeper handlers for changed states
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@self.zk_conn.DataWatch('/nodes/{}/daemonstate'.format(self.name))
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def watch_node_daemonstate(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 'stop'
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if data != self.daemon_state:
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self.daemon_state = data
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@self.zk_conn.DataWatch('/nodes/{}/routerstate'.format(self.name))
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def watch_node_routerstate(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 'client'
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if self.name == self.this_node and self.daemon_mode == 'coordinator':
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# We're a coordinator so we care about networking
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if data != self.router_state:
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self.router_state = data
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if self.config['enable_networking']:
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if self.router_state == 'primary':
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self.logger.out('Setting node {} to primary state'.format(self.name), state='i')
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transition_thread = threading.Thread(target=self.become_primary, args=(), kwargs={})
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transition_thread.start()
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else:
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# Skip becoming secondary unless already running
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if self.daemon_state == 'run' or self.daemon_state == 'shutdown':
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self.logger.out('Setting node {} to secondary state'.format(self.name), state='i')
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transition_thread = threading.Thread(target=self.become_secondary, args=(), kwargs={})
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transition_thread.start()
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@self.zk_conn.DataWatch('/nodes/{}/domainstate'.format(self.name))
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def watch_node_domainstate(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 'unknown'
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if data != self.domain_state:
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self.domain_state = data
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# toggle state management of this node
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if self.name == self.this_node:
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# Stop any existing flush jobs
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if self.flush_thread is not None:
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self.logger.out('Waiting for previous migration to complete'.format(self.name), state='i')
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self.flush_stopper = True
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while self.flush_stopper:
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time.sleep(0.1)
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# Do flushing in a thread so it doesn't block the migrates out
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if self.domain_state == 'flush':
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self.flush_thread = threading.Thread(target=self.flush, args=(), kwargs={})
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self.flush_thread.start()
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# Do unflushing in a thread so it doesn't block the migrates in
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if self.domain_state == 'unflush':
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self.flush_thread = threading.Thread(target=self.unflush, args=(), kwargs={})
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self.flush_thread.start()
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@self.zk_conn.DataWatch('/nodes/{}/memfree'.format(self.name))
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def watch_node_memfree(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 0
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if data != self.memfree:
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self.memfree = data
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@self.zk_conn.DataWatch('/nodes/{}/memused'.format(self.name))
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def watch_node_memused(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 0
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if data != self.memused:
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self.memused = data
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@self.zk_conn.DataWatch('/nodes/{}/memalloc'.format(self.name))
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def watch_node_memalloc(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 0
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if data != self.memalloc:
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self.memalloc = data
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@self.zk_conn.DataWatch('/nodes/{}/vcpualloc'.format(self.name))
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def watch_node_vcpualloc(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 0
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if data != self.vcpualloc:
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self.vcpualloc = data
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@self.zk_conn.DataWatch('/nodes/{}/runningdomains'.format(self.name))
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def watch_node_runningdomains(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii').split()
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except AttributeError:
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data = []
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if data != self.domain_list:
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self.domain_list = data
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@self.zk_conn.DataWatch('/nodes/{}/domainscount'.format(self.name))
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def watch_node_domainscount(data, stat, event=''):
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if event and event.type == 'DELETED':
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# The key has been deleted after existing before; terminate this watcher
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# because this class instance is about to be reaped in Daemon.py
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return False
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try:
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data = data.decode('ascii')
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except AttributeError:
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data = 0
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if data != self.domains_count:
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self.domains_count = data
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# Update value functions
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def update_node_list(self, d_node):
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self.d_node = d_node
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def update_network_list(self, d_network):
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self.d_network = d_network
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network_list = []
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for network in self.d_network:
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network_list.append(d_network[network].vni)
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self.network_list = network_list
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def update_domain_list(self, d_domain):
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self.d_domain = d_domain
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######
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# Phases of node transition
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#
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# Current Primary Candidate Secondary
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# -> secondary -> primary
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#
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# def become_secondary() def become_primary()
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#
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# A ----------------------------------------------------------------- SYNC (candidate)
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# B ----------------------------------------------------------------- SYNC (current)
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# 1. Stop DNS aggregator ||
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# 2. Stop DHCP servers ||
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# 4a) network 1 ||
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# 4b) network 2 ||
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# etc. ||
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# 3. Stop client API ||
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# 4. Stop metadata API ||
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# --
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# C ----------------------------------------------------------------- SYNC (candidate)
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# 5. Remove upstream floating IP 1. Add upstream floating IP ||
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# --
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# D ----------------------------------------------------------------- SYNC (candidate)
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# 6. Remove cluster floating IP 2. Add cluster floating IP ||
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# --
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# E ----------------------------------------------------------------- SYNC (candidate)
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# 7. Remove metadata floating IP 3. Add metadata floating IP ||
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# --
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# F ----------------------------------------------------------------- SYNC (candidate)
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# 8. Remove gateway IPs 4. Add gateway IPs ||
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# 8a) network 1 4a) network 1 ||
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# 8b) network 2 4b) network 2 ||
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# etc. etc. ||
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# --
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# G ----------------------------------------------------------------- SYNC (candidate)
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# 5. Transition Patroni primary ||
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# 6. Start client API ||
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# 7. Start metadata API ||
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# 8. Start DHCP servers ||
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# 5a) network 1 ||
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# 5b) network 2 ||
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# etc. ||
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# 9. Start DNS aggregator ||
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# --
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######
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def become_primary(self):
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"""
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Acquire primary coordinator status from a peer node
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"""
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# Lock the primary node until transition is complete
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primary_lock = zkhandler.writelock(self.zk_conn, '/primary_node')
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primary_lock.acquire()
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# Ensure our lock key is populated
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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# Synchronize nodes A (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization A', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization A', state='o')
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time.sleep(1) # Time for reader to acquire the lock
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self.logger.out('Releasing write lock for synchronization A', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization A', state='o')
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time.sleep(0.1) # Time for new writer to acquire the lock
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# Synchronize nodes B (I am reader)
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lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring read lock for synchronization B', state='i')
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lock.acquire()
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self.logger.out('Acquired read lock for synchronization B', state='o')
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self.logger.out('Releasing read lock for synchronization B', state='i')
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lock.release()
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self.logger.out('Released read lock for synchronization B', state='o')
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# Synchronize nodes C (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization C', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization C', state='o')
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time.sleep(0.5) # Time for reader to acquire the lock
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# 1. Add Upstream floating IP
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self.logger.out(
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'Creating floating upstream IP {}/{} on interface {}'.format(
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self.upstream_ipaddr,
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self.upstream_cidrnetmask,
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'brupstream'
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),
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state='o'
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)
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common.createIPAddress(self.upstream_ipaddr, self.upstream_cidrnetmask, 'brupstream')
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self.logger.out('Releasing write lock for synchronization C', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization C', state='o')
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# Synchronize nodes D (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization D', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization D', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 2. Add Cluster floating IP
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self.logger.out(
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'Creating floating management IP {}/{} on interface {}'.format(
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self.vni_ipaddr,
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self.vni_cidrnetmask,
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'brcluster'
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),
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state='o'
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)
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common.createIPAddress(self.vni_ipaddr, self.vni_cidrnetmask, 'brcluster')
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self.logger.out('Releasing write lock for synchronization D', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization D', state='o')
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# Synchronize nodes E (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization E', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization E', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 3. Add Metadata link-local IP
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self.logger.out(
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'Creating Metadata link-local IP {}/{} on interface {}'.format(
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'169.254.169.254',
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'32',
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'lo'
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),
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state='o'
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)
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common.createIPAddress('169.254.169.254', '32', 'lo')
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self.logger.out('Releasing write lock for synchronization E', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization E', state='o')
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# Synchronize nodes F (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization F', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization F', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 4. Add gateway IPs
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for network in self.d_network:
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self.d_network[network].createGateways()
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self.logger.out('Releasing write lock for synchronization F', state='i')
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zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
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lock.release()
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self.logger.out('Released write lock for synchronization F', state='o')
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# Synchronize nodes G (I am writer)
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lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
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self.logger.out('Acquiring write lock for synchronization G', state='i')
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lock.acquire()
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self.logger.out('Acquired write lock for synchronization G', state='o')
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time.sleep(0.2) # Time for reader to acquire the lock
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# 5. Transition Patroni primary
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self.logger.out('Setting Patroni leader to this node', state='i')
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tick = 1
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patroni_failed = True
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# As long as we're primary, keep trying to set the Patroni leader to us
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while self.router_state == 'primary':
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# Switch Patroni leader to the local instance
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retcode, stdout, stderr = common.run_os_command(
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"""
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patronictl
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-c /etc/patroni/config.yml
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-d zookeeper://localhost:2181
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switchover
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--candidate {}
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--force
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pvc
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""".format(self.name)
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)
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# Combine the stdout and stderr and strip the output
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# Patronictl's output is pretty junky
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if stderr:
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stdout += stderr
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stdout = stdout.strip()
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# Handle our current Patroni leader being us
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if stdout and stdout.split('\n')[-1].split() == ["Error:", "Switchover", "target", "and", "source", "are", "the", "same."]:
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self.logger.out('Failed to switch Patroni leader to ourselves; this is fine\n{}'.format(stdout), state='w')
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break
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# Handle a failed switchover
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elif stdout and (stdout.split('\n')[-1].split()[:2] == ["Switchover", "failed,"] or stdout.strip().split('\n')[-1].split()[:1] == ["Error"]):
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if tick > 4:
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self.logger.out('Failed to switch Patroni leader after 5 tries; aborting', state='e')
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break
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else:
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self.logger.out('Failed to switch Patroni leader; retrying [{}/5]\n{}\n'.format(tick, stdout), state='e')
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tick += 1
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time.sleep(5)
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# Otherwise, we succeeded
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else:
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self.logger.out('Successfully switched Patroni leader\n{}'.format(stdout), state='o')
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patroni_failed = False
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time.sleep(0.2)
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break
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# 6. Start client API (and provisioner worker)
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if self.config['enable_api']:
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self.logger.out('Starting PVC API client service', state='i')
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common.run_os_command("systemctl start pvc-api.service")
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self.logger.out('Starting PVC Provisioner Worker service', state='i')
|
|
common.run_os_command("systemctl start pvc-provisioner-worker.service")
|
|
# 7. Start metadata API; just continue if we fail
|
|
self.metadata_api.start()
|
|
# 8. Start DHCP servers
|
|
for network in self.d_network:
|
|
self.d_network[network].startDHCPServer()
|
|
# 9. Start DNS aggregator; just continue if we fail
|
|
if not patroni_failed:
|
|
self.dns_aggregator.start_aggregator()
|
|
else:
|
|
self.logger.out('Not starting DNS aggregator due to Patroni failures', state='e')
|
|
self.logger.out('Releasing write lock for synchronization G', state='i')
|
|
zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
|
|
lock.release()
|
|
self.logger.out('Released write lock for synchronization G', state='o')
|
|
|
|
primary_lock.release()
|
|
self.logger.out('Node {} transitioned to primary state'.format(self.name), state='o')
|
|
|
|
def become_secondary(self):
|
|
"""
|
|
Relinquish primary coordinator status to a peer node
|
|
"""
|
|
time.sleep(0.2) # Initial delay for the first writer to grab the lock
|
|
|
|
# Synchronize nodes A (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
|
self.logger.out('Acquiring read lock for synchronization A', state='i')
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization A', state='o')
|
|
self.logger.out('Releasing read lock for synchronization A', state='i')
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization A', state='o')
|
|
|
|
# Synchronize nodes B (I am writer)
|
|
lock = zkhandler.writelock(self.zk_conn, '/locks/primary_node')
|
|
self.logger.out('Acquiring write lock for synchronization B', state='i')
|
|
lock.acquire()
|
|
self.logger.out('Acquired write lock for synchronization B', state='o')
|
|
time.sleep(0.2) # Time for reader to acquire the lock
|
|
# 1. Stop DNS aggregator
|
|
self.dns_aggregator.stop_aggregator()
|
|
# 2. Stop DHCP servers
|
|
for network in self.d_network:
|
|
self.d_network[network].stopDHCPServer()
|
|
self.logger.out('Releasing write lock for synchronization B', state='i')
|
|
zkhandler.writedata(self.zk_conn, {'/locks/primary_node': ''})
|
|
lock.release()
|
|
self.logger.out('Released write lock for synchronization B', state='o')
|
|
# 3. Stop client API
|
|
if self.config['enable_api']:
|
|
self.logger.out('Stopping PVC API client service', state='i')
|
|
common.run_os_command("systemctl stop pvc-api.service")
|
|
# 4. Stop metadata API
|
|
self.metadata_api.stop()
|
|
time.sleep(0.1) # Time for new writer to acquire the lock
|
|
|
|
# Synchronize nodes C (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
|
self.logger.out('Acquiring read lock for synchronization C', state='i')
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization C', state='o')
|
|
# 5. Remove Upstream floating IP
|
|
self.logger.out(
|
|
'Removing floating upstream IP {}/{} from interface {}'.format(
|
|
self.upstream_ipaddr,
|
|
self.upstream_cidrnetmask,
|
|
'brupstream'
|
|
),
|
|
state='o'
|
|
)
|
|
common.removeIPAddress(self.upstream_ipaddr, self.upstream_cidrnetmask, 'brupstream')
|
|
self.logger.out('Releasing read lock for synchronization C', state='i')
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization C', state='o')
|
|
|
|
# Synchronize nodes D (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
|
self.logger.out('Acquiring read lock for synchronization D', state='i')
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization D', state='o')
|
|
# 6. Remove Cluster floating IP
|
|
self.logger.out(
|
|
'Removing floating management IP {}/{} from interface {}'.format(
|
|
self.vni_ipaddr,
|
|
self.vni_cidrnetmask,
|
|
'brcluster'
|
|
),
|
|
state='o'
|
|
)
|
|
common.removeIPAddress(self.vni_ipaddr, self.vni_cidrnetmask, 'brcluster')
|
|
self.logger.out('Releasing read lock for synchronization D', state='i')
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization D', state='o')
|
|
|
|
# Synchronize nodes E (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
|
self.logger.out('Acquiring read lock for synchronization E', state='i')
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization E', state='o')
|
|
# 7. Remove Metadata link-local IP
|
|
self.logger.out(
|
|
'Removing Metadata link-local IP {}/{} from interface {}'.format(
|
|
'169.254.169.254',
|
|
'32',
|
|
'lo'
|
|
),
|
|
state='o'
|
|
)
|
|
common.removeIPAddress('169.254.169.254', '32', 'lo')
|
|
self.logger.out('Releasing read lock for synchronization E', state='i')
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization E', state='o')
|
|
|
|
# Synchronize nodes F (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
|
self.logger.out('Acquiring read lock for synchronization F', state='i')
|
|
lock.acquire()
|
|
self.logger.out('Acquired read lock for synchronization F', state='o')
|
|
# 8. Remove gateway IPs
|
|
for network in self.d_network:
|
|
self.d_network[network].removeGateways()
|
|
self.logger.out('Releasing read lock for synchronization F', state='i')
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization F', state='o')
|
|
|
|
# Synchronize nodes G (I am reader)
|
|
lock = zkhandler.readlock(self.zk_conn, '/locks/primary_node')
|
|
self.logger.out('Acquiring read lock for synchronization G', state='i')
|
|
try:
|
|
lock.acquire(timeout=60) # Don't wait forever and completely block us
|
|
self.logger.out('Acquired read lock for synchronization G', state='o')
|
|
except:
|
|
pass
|
|
self.logger.out('Releasing read lock for synchronization G', state='i')
|
|
lock.release()
|
|
self.logger.out('Released read lock for synchronization G', state='o')
|
|
|
|
self.logger.out('Node {} transitioned to secondary state'.format(self.name), state='o')
|
|
|
|
# Flush all VMs on the host
|
|
def flush(self):
|
|
# Begin flush
|
|
self.logger.out('Flushing node "{}" of running VMs'.format(self.name), state='i')
|
|
self.logger.out('VM list: {}'.format(', '.join(self.domain_list)), state='i')
|
|
fixed_domain_list = self.domain_list.copy()
|
|
for dom_uuid in fixed_domain_list:
|
|
# Allow us to cancel the operation
|
|
if self.flush_stopper:
|
|
self.logger.out('Aborting node flush'.format(self.name), state='i')
|
|
self.flush_thread = None
|
|
self.flush_stopper = False
|
|
return
|
|
|
|
self.logger.out('Selecting target to migrate VM "{}"'.format(dom_uuid), state='i')
|
|
|
|
target_node = common.findTargetNode(self.zk_conn, self.config, dom_uuid)
|
|
|
|
# Don't replace the previous node if the VM is already migrated
|
|
if zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(dom_uuid)):
|
|
current_node = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(dom_uuid))
|
|
else:
|
|
current_node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(dom_uuid))
|
|
|
|
if target_node is None:
|
|
self.logger.out('Failed to find migration target for VM "{}"; shutting down and setting autostart flag'.format(dom_uuid), state='e')
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(dom_uuid): 'shutdown' })
|
|
zkhandler.writedata(self.zk_conn, { '/domains/{}/node_autostart'.format(dom_uuid): 'True' })
|
|
|
|
# Wait for the VM to shut down
|
|
while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) in ['shutdown']:
|
|
time.sleep(1)
|
|
|
|
continue
|
|
|
|
self.logger.out('Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node), state='i')
|
|
zkhandler.writedata(self.zk_conn, {
|
|
'/domains/{}/state'.format(dom_uuid): 'migrate',
|
|
'/domains/{}/node'.format(dom_uuid): target_node,
|
|
'/domains/{}/lastnode'.format(dom_uuid): current_node
|
|
})
|
|
|
|
# Wait for the VM to migrate so the next VM's free RAM count is accurate (they migrate in serial anyways)
|
|
while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) in ['migrate', 'unmigrate', 'shutdown']:
|
|
time.sleep(1)
|
|
|
|
zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.name): '' })
|
|
zkhandler.writedata(self.zk_conn, { '/nodes/{}/domainstate'.format(self.name): 'flushed' })
|
|
self.flush_thread = None
|
|
self.flush_stopper = False
|
|
return
|
|
|
|
def unflush(self):
|
|
self.logger.out('Restoring node {} to active service.'.format(self.name), state='i')
|
|
fixed_domain_list = self.d_domain.copy()
|
|
for dom_uuid in fixed_domain_list:
|
|
# Allow us to cancel the operation
|
|
if self.flush_stopper:
|
|
self.logger.out('Aborting node unflush'.format(self.name), state='i')
|
|
self.flush_thread = None
|
|
self.flush_stopper = False
|
|
return
|
|
|
|
# Handle autostarts
|
|
autostart = zkhandler.readdata(self.zk_conn, '/domains/{}/node_autostart'.format(dom_uuid))
|
|
node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(dom_uuid))
|
|
if autostart == 'True' and node == self.name:
|
|
self.logger.out('Starting autostart VM "{}"'.format(dom_uuid), state='i')
|
|
zkhandler.writedata(self.zk_conn, {
|
|
'/domains/{}/state'.format(dom_uuid): 'start',
|
|
'/domains/{}/node'.format(dom_uuid): self.name,
|
|
'/domains/{}/lastnode'.format(dom_uuid): '',
|
|
'/domains/{}/node_autostart'.format(dom_uuid): 'False'
|
|
})
|
|
continue
|
|
|
|
try:
|
|
last_node = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(dom_uuid))
|
|
except:
|
|
continue
|
|
|
|
if last_node != self.name:
|
|
continue
|
|
|
|
self.logger.out('Setting unmigration for VM "{}"'.format(dom_uuid), state='i')
|
|
zkhandler.writedata(self.zk_conn, {
|
|
'/domains/{}/state'.format(dom_uuid): 'migrate',
|
|
'/domains/{}/node'.format(dom_uuid): self.name,
|
|
'/domains/{}/lastnode'.format(dom_uuid): ''
|
|
})
|
|
|
|
# Wait for the VM to migrate back
|
|
while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) in ['migrate', 'unmigrate', 'shutdown']:
|
|
time.sleep(1)
|
|
|
|
zkhandler.writedata(self.zk_conn, { '/nodes/{}/domainstate'.format(self.name): 'ready' })
|
|
self.flush_thread = None
|
|
self.flush_stopper = False
|
|
return
|