504 lines
19 KiB
Python
504 lines
19 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 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):
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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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# 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 upstreams
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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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# Flags
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self.inflush = 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.router_state == 'primary':
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self.become_primary()
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else:
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self.become_secondary()
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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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if self.domain_state == 'flush' and self.inflush == False:
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# Do flushing in a thread so it doesn't block the migrates out
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flush_thread = threading.Thread(target=self.flush, args=(), kwargs={})
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flush_thread.start()
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if self.domain_state == 'unflush' and self.inflush == False:
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# Do unflushing in a thread so it doesn't block the migrates in
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flush_thread = threading.Thread(target=self.unflush, args=(), kwargs={})
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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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# Routing primary/secondary states
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def become_secondary(self):
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if self.config['enable_networking']:
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self.logger.out('Setting router {} to secondary state'.format(self.name), state='i')
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self.logger.out('Network list: {}'.format(', '.join(self.network_list)))
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time.sleep(1)
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for network in self.d_network:
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self.d_network[network].stopDHCPServer()
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self.d_network[network].removeGateways()
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self.removeFloatingAddresses()
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self.dns_aggregator.stop_aggregator()
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def become_primary(self):
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if self.config['enable_networking']:
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self.logger.out('Setting router {} to primary state'.format(self.name), state='i')
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self.logger.out('Network list: {}'.format(', '.join(self.network_list)))
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self.createFloatingAddresses()
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# Start up the gateways and DHCP servers
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for network in self.d_network:
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self.d_network[network].createGateways()
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self.d_network[network].startDHCPServer()
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time.sleep(0.5)
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self.dns_aggregator.start_aggregator()
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def createFloatingAddresses(self):
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# VNI 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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# 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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self.upstream_dev
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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, self.upstream_dev)
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def removeFloatingAddresses(self):
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# VNI floating IP
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self.logger.out(
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'Removing floating management IP {}/{} from 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.removeIPAddress(self.vni_ipaddr, self.vni_cidrnetmask, 'brcluster')
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# Upstream floating IP
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self.logger.out(
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'Removing floating upstream IP {}/{} from interface {}'.format(
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self.upstream_ipaddr,
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self.upstream_cidrnetmask,
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self.upstream_dev
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),
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state='o'
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)
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common.removeIPAddress(self.upstream_ipaddr, self.upstream_cidrnetmask, self.upstream_dev)
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# Flush all VMs on the host
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def flush(self):
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# Wait indefinitely for the flush_lock to be freed
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time.sleep(0.5)
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while zkhandler.readdata(self.zk_conn, '/locks/flush_lock') == 'True':
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time.sleep(2)
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# Acquire the flush lock
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zkhandler.writedata(self.zk_conn, {
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'/locks/flush_lock': 'True'
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})
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# Begin flush
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self.inflush = True
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self.logger.out('Flushing node "{}" of running VMs'.format(self.name), state='i')
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self.logger.out('Domain list: {}'.format(', '.join(self.domain_list)))
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fixed_domain_list = self.domain_list.copy()
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for dom_uuid in fixed_domain_list:
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self.logger.out('Selecting target to migrate VM "{}"'.format(dom_uuid), state='i')
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current_node = zkhandler.readdata(self.zk_conn, '/domains/{}/node'.format(dom_uuid))
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target_node = findTargetHypervisor(self.zk_conn, 'mem', dom_uuid)
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if target_node == None:
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self.logger.out('Failed to find migration target for VM "{}"; shutting down'.format(dom_uuid), state='e')
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(dom_uuid): 'shutdown' })
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else:
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self.logger.out('Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node), state='i')
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zkhandler.writedata(self.zk_conn, {
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'/domains/{}/state'.format(dom_uuid): 'migrate',
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'/domains/{}/node'.format(dom_uuid): target_node,
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'/domains/{}/lastnode'.format(dom_uuid): current_node
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})
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# Wait for the VM to migrate so the next VM's free RAM count is accurate (they migrate in serial anyways)
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while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) != 'start':
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time.sleep(1)
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/runningdomains'.format(self.name): '' })
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/domainstate'.format(self.name): 'flushed' })
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self.inflush = False
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# Release the flush lock
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zkhandler.writedata(self.zk_conn, {
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'/locks/flush_lock': 'False'
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})
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def unflush(self):
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# Wait indefinitely for the flush_lock to be freed
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time.sleep(0.5)
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while zkhandler.readdata(self.zk_conn, '/locks/flush_lock') == 'True':
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time.sleep(2)
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# Acquire the flush lock
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zkhandler.writedata(self.zk_conn, {
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'/locks/flush_lock': 'True'
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})
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self.inflush = True
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self.logger.out('Restoring node {} to active service.'.format(self.name), state='i')
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fixed_domain_list = self.d_domain.copy()
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for dom_uuid in fixed_domain_list:
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try:
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last_node = zkhandler.readdata(self.zk_conn, '/domains/{}/lastnode'.format(dom_uuid))
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except:
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continue
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if last_node != self.name:
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continue
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self.logger.out('Setting unmigration for VM "{}"'.format(dom_uuid), state='i')
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zkhandler.writedata(self.zk_conn, {
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'/domains/{}/state'.format(dom_uuid): 'migrate',
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'/domains/{}/node'.format(dom_uuid): self.name,
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'/domains/{}/lastnode'.format(dom_uuid): ''
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})
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# Wait for the VM to migrate back
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while zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid)) != 'start':
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time.sleep(1)
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/domainstate'.format(self.name): 'ready' })
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self.inflush = False
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# Release the flush lock
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zkhandler.writedata(self.zk_conn, {
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'/locks/flush_lock': 'False'
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})
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#
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# Find a migration target
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#
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def findTargetHypervisor(zk_conn, search_field, dom_uuid):
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if search_field == 'mem':
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return findTargetHypervisorMem(zk_conn, dom_uuid)
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if search_field == 'load':
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return findTargetHypervisorLoad(zk_conn, dom_uuid)
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if search_field == 'vcpus':
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return findTargetHypervisorVCPUs(zk_conn, dom_uuid)
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if search_field == 'vms':
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return findTargetHypervisorVMs(zk_conn, dom_uuid)
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return None
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# Get the list of valid target nodes
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def getHypervisors(zk_conn, dom_uuid):
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valid_node_list = []
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full_node_list = zkhandler.listchildren(zk_conn, '/nodes')
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current_node = zkhandler.readdata(zk_conn, '/domains/{}/node'.format(dom_uuid))
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for node in full_node_list:
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daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(node))
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domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(node))
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if node == current_node:
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continue
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if daemon_state != 'run' or domain_state != 'ready':
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continue
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valid_node_list.append(node)
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return valid_node_list
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# via free memory (relative to allocated memory)
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def findTargetHypervisorMem(zk_conn, dom_uuid):
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most_allocfree = 0
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target_node = None
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node_list = getHypervisors(zk_conn, dom_uuid)
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for node in node_list:
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memalloc = int(zkhandler.readdata(zk_conn, '/nodes/{}/memalloc'.format(node)))
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memused = int(zkhandler.readdata(zk_conn, '/nodes/{}/memused'.format(node)))
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memfree = int(zkhandler.readdata(zk_conn, '/nodes/{}/memfree'.format(node)))
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memtotal = memused + memfree
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allocfree = memtotal - memalloc
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if allocfree > most_allocfree:
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most_allocfree = allocfree
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target_node = node
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return target_node
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# via load average
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def findTargetHypervisorLoad(zk_conn, dom_uuid):
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least_load = 9999
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target_node = None
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node_list = getHypervisors(zk_conn, dom_uuid)
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for node in node_list:
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load = int(zkhandler.readdata(zk_conn, '/nodes/{}/load'.format(node)))
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if load < least_load:
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least_load = load
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target_hypevisor = node
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return target_node
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# via total vCPUs
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def findTargetHypervisorVCPUs(zk_conn, dom_uuid):
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least_vcpus = 9999
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target_node = None
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node_list = getHypervisors(zk_conn, dom_uuid)
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for node in node_list:
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vcpus = int(zkhandler.readdata(zk_conn, '/nodes/{}/vcpualloc'.format(node)))
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if vcpus < least_vcpus:
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least_vcpus = vcpus
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target_node = node
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return target_node
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# via total VMs
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def findTargetHypervisorVMs(zk_conn, dom_uuid):
|
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least_vms = 9999
|
|
target_node = None
|
|
|
|
node_list = getHypervisors(zk_conn, dom_uuid)
|
|
for node in node_list:
|
|
vms = int(zkhandler.readdata(zk_conn, '/nodes/{}/domainscount'.format(node)))
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|
|
|
if vms < least_vms:
|
|
least_vms = vms
|
|
target_node = node
|
|
|
|
return target_node
|