254 lines
11 KiB
Python
254 lines
11 KiB
Python
#!/usr/bin/env python3
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# NodeInstance.py - Class implementing a PVC node and run by 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, sys, socket, time, libvirt, kazoo.client, threading, fencenode
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class NodeInstance():
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def __init__(self, name, t_node, s_domain, zk):
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# Passed-in variables on creation
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self.zk = zk
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self.name = name
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self.state = 'stop'
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self.t_node = t_node
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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.s_domain = s_domain
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self.domain_list = []
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# Zookeeper handlers for changed states
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@zk.DataWatch('/nodes/{}/state'.format(self.name))
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def watch_hypervisor_state(data, stat, event=""):
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try:
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self.state = data.decode('ascii')
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except AttributeError:
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self.state = 'stop'
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if self.state == 'flush':
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self.flush()
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if self.state == 'unflush':
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self.unflush()
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@zk.DataWatch('/nodes/{}/memfree'.format(self.name))
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def watch_hypervisor_memfree(data, stat, event=""):
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try:
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self.memfree = data.decode('ascii')
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except AttributeError:
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self.memfree = 0
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@zk.DataWatch('/nodes/{}/runningdomains'.format(self.name))
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def watch_hypervisor_runningdomains(data, stat, event=""):
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try:
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self.domain_list = data.decode('ascii').split()
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except AttributeError:
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self.domain_list = []
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# Get value functions
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def getfreemem(self):
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return self.memfree
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def getcpuload(self):
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return self.cpuload
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def getname(self):
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return self.name
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def getstate(self):
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return self.state
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def getdomainlist(self):
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return self.domain_list
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# Update value functions
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def updatenodelist(self, t_node):
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self.t_node = t_node
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def updatedomainlist(self, s_domain):
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self.s_domain = s_domain
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# Flush all VMs on the host
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def flush(self):
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print('>>> Flushing node {} of running VMs.'.format(self.name))
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for dom_uuid in self.domain_list:
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most_memfree = 0
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hypervisor_list = zk.get_children('/nodes')
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current_hypervisor = zk.get('/dom_uuids/{}/hypervisor'.format(dom_uuid))[0].decode('ascii')
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for hypervisor in hypervisor_list:
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state = zk.get('/nodes/{}/state'.format(hypervisor))[0].decode('ascii')
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if state != 'start' or hypervisor == current_hypervisor:
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continue
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memfree = int(zk.get('/nodes/{}/memfree'.format(hypervisor))[0].decode('ascii'))
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if memfree > most_memfree:
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most_memfree = memfree
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target_hypervisor = hypervisor
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if least_host == None:
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print('>>> Failed to find migration target for VM "{}"; shutting down.'.format(dom_uuid))
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transaction = self.zk.transaction()
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transaction.set_data('/domains/{}/state'.format(dom_uuid), 'shutdown'.encode('ascii'))
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transaction.commit()
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else:
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print('>>> Moving VM "{}" to hypervisor "{}".'.format(dom_uuid, target_hypervisor))
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transaction = self.zk.transaction()
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transaction.set_data('/domains/{}/state'.format(dom_uuid), 'start'.encode('ascii'))
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transaction.set_data('/domains/{}/hypervisor'.format(dom_uuid), target_hypervisor.encode('ascii'))
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transaction.set_data('/domains/{}/lasthypervisor'.format(dom_uuid), current_hypervisor.encode('ascii'))
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result = transaction.commit()
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# Wait 1s between migrations
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time.sleep(1)
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def unflush(self):
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print('>>> Restoring node {} to active service.'.format(self.name))
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self.zk.set('/nodes/{}/state'.format(self.name), 'start'.encode('ascii'))
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for dom_uuid in self.s_domain:
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last_hypervisor = self.zk.get('/domains/{}/lasthypervisor'.format(dom_uuid))[0].decode('ascii')
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if last_hypervisor != self.name:
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continue
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print('>>> Setting unmigration for VM "{}".'.format(domain))
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transaction = self.zk.transaction()
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transaction.set_data('/domains/{}/state'.format(dom_uuid), 'migrate'.encode('ascii'))
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transaction.set_data('/domains/{}/hypervisor'.format(dom_uuid), self.name.encode('ascii'))
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transaction.set_data('/domains/{}/lasthypervisor'.format(dom_uuid), ''.encode('ascii'))
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result = transaction.commit()
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# Wait 1s between migrations
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time.sleep(1)
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def update_zookeeper(self):
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# Connect to libvirt
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libvirt_name = "qemu:///system"
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conn = libvirt.open(libvirt_name)
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if conn == None:
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print('>>> Failed to open connection to {}'.format(libvirt_name))
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return
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# Get past state and update if needed
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past_state = self.zk.get('/nodes/{}/state'.format(self.name))[0].decode('ascii')
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if past_state != 'flush':
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self.state = 'start'
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self.zk.set('/nodes/{}/state'.format(self.name), 'start'.encode('ascii'))
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else:
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self.state = 'flush'
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# Toggle state management of all VMs and remove any non-running VMs
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for domain, instance in self.s_domain.items():
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if instance.inshutdown == False and domain in self.domain_list:
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instance.manage_vm_state()
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if instance.dom == None:
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try:
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self.domain_list.remove(domain)
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except:
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pass
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else:
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try:
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state = instance.dom.state()[0]
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except:
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state = libvirt.VIR_DOMAIN_NOSTATE
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if state != libvirt.VIR_DOMAIN_RUNNING:
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try:
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self.domain_list.remove(domain)
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except:
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pass
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# Set our information in zookeeper
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self.name = conn.getHostname()
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self.cpucount = conn.getCPUMap()[0]
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self.memfree = conn.getFreeMemory()
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self.cpuload = os.getloadavg()[0]
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keepalive_time = int(time.time())
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try:
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self.zk.set('/nodes/{}/cpucount'.format(self.name), str(self.cpucount).encode('ascii'))
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self.zk.set('/nodes/{}/memfree'.format(self.name), str(self.memfree).encode('ascii'))
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self.zk.set('/nodes/{}/cpuload'.format(self.name), str(self.cpuload).encode('ascii'))
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self.zk.set('/nodes/{}/runningdomains'.format(self.name), ' '.join(self.domain_list).encode('ascii'))
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self.zk.set('/nodes/{}/keepalive'.format(self.name), str(keepalive_time).encode('ascii'))
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except:
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return
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# Close the Libvirt connection
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conn.close()
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# Display node information to the terminal
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print('>>> {} - {} keepalive'.format(time.strftime('%d/%m/%Y %H:%M:%S'), self.name))
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print(' CPUs: {} | Free memory: {} | Load: {}'.format(self.cpucount, self.memfree, self.cpuload))
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print(' Active domains: {}'.format(' '.join(self.domain_list)))
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# Update our local node lists
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for node_name in self.t_node:
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try:
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node_state = self.zk.get('/nodes/{}/state'.format(node_name))[0].decode('ascii')
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node_keepalive = int(self.zk.get('/nodes/{}/keepalive'.format(node_name))[0].decode('ascii'))
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except:
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node_state = 'unknown'
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node_keepalive = 0
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# Handle deadtime and fencng if needed
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# (A node is considered dead when its keepalive timer is >30s out-of-date while in 'start' state)
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node_deadtime = int(time.time()) - 30
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if node_keepalive < node_deadtime and node_state == 'start':
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print('>>> Node {} is dead! Performing fence operation in 3 seconds.'.format(node_name))
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self.zk.set('/nodes/{}/state'.format(node_name), 'dead'.encode('ascii'))
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fence_thread = threading.Thread(target=fencenode.fence, args=(node_name, self.zk), kwargs={})
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fence_thread.start()
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# Update the arrays
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if node_state == 'start' and node_name not in self.active_node_list:
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self.active_node_list.append(node_name)
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try:
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self.flushed_node_list.remove(node_name)
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except ValueError:
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pass
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try:
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self.inactive_node_list.remove(node_name)
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except ValueError:
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pass
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if node_state == 'flush' and node_name not in self.flushed_node_list:
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self.flushed_node_list.append(node_name)
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try:
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self.active_node_list.remove(node_name)
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except ValueError:
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pass
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try:
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self.inactive_node_list.remove(node_name)
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except ValueError:
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pass
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if node_state != 'start' and node_state != 'flush' and node_name not in self.inactive_node_list:
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self.inactive_node_list.append(node_name)
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try:
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self.active_node_list.remove(node_name)
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except ValueError:
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pass
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try:
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self.flushed_node_list.remove(node_name)
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except ValueError:
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pass
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# Display cluster information to the terminal
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print('>>> {} - Cluster status'.format(time.strftime('%d/%m/%Y %H:%M:%S')))
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print(' Active nodes: {}'.format(' '.join(self.active_node_list)))
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print(' Flushed nodes: {}'.format(' '.join(self.flushed_node_list)))
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print(' Inactive nodes: {}'.format(' '.join(self.inactive_node_list)))
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