133 lines
4.3 KiB
Python
Executable File
133 lines
4.3 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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import ansiiprint
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def help():
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print(ansiiprint.bold() + "pvcd - Parallel Virtual Cluster management daemon" + ansiiprint.end())
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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(ansiiprint.red() + "Failed to connect to local Zookeeper instance" + ansiiprint.end())
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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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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/{}/state'.format(myhostname), '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('/nodes/{}'.format(myhostname)):
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print("Node is " + ansiiprint.green() + "present" + ansiiprint.end() + " in Zookeeper")
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else:
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print("Node is " + ansiiprint.red() + "absent" + ansiiprint.end() + " in Zookeeper; adding new node")
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keepalive_time = int(time.time())
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zk.create('/domains/{}'.format(myhostname), 'hypervisor'.encode('ascii'))
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zk.create('/domains/{}/state'.format(myhostname), 'stop'.encode('ascii'))
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zk.create('/domains/{}/cpucount'.format(myhostname), '0'.encode('ascii'))
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zk.create('/domains/{}/memfree'.format(myhostname), '0'.encode('ascii'))
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zk.create('/domains/{}/cpuload'.format(myhostname), '0.0'.encode('ascii'))
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zk.create('/domains/{}/runningdomains'.format(myhostname), ''.encode('ascii'))
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zk.create('/domains/{}/keepalive'.format(myhostname), str(keepalive_time).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(ansiiprint.blue() + 'Node list: ' + ansiiprint.end() + '{}'.format(' '.join(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(ansiiprint.blue() + 'Domain list: ' + ansiiprint.end() + '{}'.format(' '.join(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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