131 lines
3.8 KiB
Python
Executable File
131 lines
3.8 KiB
Python
Executable File
#!/usr/bin/env python3
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# pvcd.py - PVC hypervisor node daemon
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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 kazoo.client
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import libvirt
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import sys
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import socket
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import uuid
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import VMInstance
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import NodeInstance
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import time
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import atexit
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import apscheduler.schedulers.background
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def help():
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print("pvcd - Parallel Virtual Cluster management daemon")
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# exit(0)
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help()
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# Connect to local zookeeper
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zk = kazoo.client.KazooClient(hosts='127.0.0.1:2181')
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try:
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zk.start()
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except:
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print("Failed to connect to local Zookeeper instance")
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exit(1)
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def zk_listener(state):
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if state == kazoo.client.KazooState.LOST:
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cleanup()
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exit(2)
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elif state == kazoo.client.KazooState.SUSPENDED:
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cleanup()
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exit(2)
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else:
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# Handle being connected/reconnected to Zookeeper
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pass
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zk.add_listener(zk_listener)
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myhostname = socket.gethostname()
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mynodestring = '/nodes/%s' % myhostname
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def cleanup():
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try:
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update_timer.shutdown()
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if t_node[myhostname].getstate() != 'flush':
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zk.set('/nodes/' + myhostname + '/state', 'stop'.encode('ascii'))
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zk.stop()
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zk.close()
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except:
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pass
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atexit.register(cleanup)
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# Check if our node exists in Zookeeper, and create it if not
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if zk.exists('%s' % mynodestring):
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print("Node is present in Zookeeper")
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else:
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zk.create('%s' % mynodestring, 'hypervisor'.encode('ascii'))
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zk.create('%s/state' % mynodestring, 'stop'.encode('ascii'))
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zk.create('%s/cpucount' % mynodestring, '0'.encode('ascii'))
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zk.create('%s/memfree' % mynodestring, '0'.encode('ascii'))
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zk.create('%s/cpuload' % mynodestring, '0.0'.encode('ascii'))
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zk.create('%s/runningdomains' % mynodestring, ''.encode('ascii'))
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t_node = dict()
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s_domain = dict()
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node_list = []
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domain_list = []
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@zk.ChildrenWatch('/nodes')
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def updatenodes(new_node_list):
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global node_list
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node_list = new_node_list
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print('Node list: %s' % node_list)
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for node in node_list:
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if node in t_node:
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t_node[node].updatenodelist(t_node)
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else:
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t_node[node] = NodeInstance.NodeInstance(node, t_node, s_domain, zk)
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@zk.ChildrenWatch('/domains')
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def updatedomains(new_domain_list):
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global domain_list
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domain_list = new_domain_list
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print('Domain list: %s' % domain_list)
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for domain in domain_list:
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if not domain in s_domain:
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s_domain[domain] = VMInstance.VMInstance(domain, zk, t_node[myhostname]);
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for node in node_list:
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if node in t_node:
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t_node[node].updatedomainlist(s_domain)
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# Set up our update function
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this_node = t_node[myhostname]
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update_zookeeper = this_node.update_zookeeper
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# Create timer to update this node in Zookeeper
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update_timer = apscheduler.schedulers.background.BackgroundScheduler()
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update_timer.add_job(update_zookeeper, 'interval', seconds=5)
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update_timer.start()
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# Tick loop
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while True:
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try:
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time.sleep(0.1)
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except:
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break
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