117 lines
3.9 KiB
Python
117 lines
3.9 KiB
Python
#!/usr/bin/env python3
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import os, socket, time, uuid, threading, libvirt, kazoo.client
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class NodeInstance(threading.Thread):
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def __init__(self, name, node_list, zk):
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super(NodeInstance, self).__init__()
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# Passed-in variables on creation
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self.zkey = '/nodes/%s' % name
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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.stop_thread = threading.Event()
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self.node_list = node_list
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self.domainlist = []
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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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# Update value functions
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def updatenodelist(self, node_list):
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self.node_list = node_list
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# Shutdown the thread
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def stop(self):
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self.stop_thread.set()
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# Flush all VMs on the host
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def flush(self):
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for domain in self.domainlist:
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# Determine the best target hypervisor
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least_mem = (2^64)/8
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least_load = 999.0
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least_host = ""
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for node in node_list:
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node_freemem = node.getfreemem()
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if node_freemem < least_mem:
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least_mem = node_freemem
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least_host = node.getname()
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self.zk.set('/domains/' + domain + '/state', 'flush'.encode('ascii'))
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self.zk.set('/domains/' + domain + '/hypervisor', least_host.encode('ascii'))
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def run(self):
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if self.name == socket.gethostname():
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self.setup_local_node()
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else:
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self.setup_remote_node()
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def setup_local_node(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 %s' % libvirt_name)
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exit(1)
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# Gather data about hypervisor
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self.name = conn.getHostname()
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self.cpucount = conn.getCPUMap()[0]
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self.zk.set(self.zkey + '/state', 'start'.encode('ascii'))
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self.zk.set(self.zkey + '/cpucount', str(self.cpucount).encode('ascii'))
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print("Node hostname: %s" % self.name)
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print("CPUs: %s" % self.cpucount)
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while True:
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self.memfree = conn.getFreeMemory()
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self.cpuload = os.getloadavg()[0]
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self.zk.set(self.zkey + '/memfree', str(self.memfree).encode('ascii'))
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self.zk.set(self.zkey + '/cpuload', str(self.cpuload).encode('ascii'))
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print("Free memory: %s | Load: %s" % ( self.memfree, self.cpuload ))
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print("Active domains: %s" % self.domainlist)
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for x in range(0,50):
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time.sleep(0.1)
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if self.stop_thread.is_set():
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return
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@zk.DataWatch(self.zkey + '/state')
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def watch_state(data, stat):
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self.state = data.decode('ascii')
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print("Version: %s, data: %s" % (stat.version, self.state))
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if self.state == 'flush':
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self.flush()
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def setup_remote_node(self):
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@zk.DataWatch(self.zkey + '/state')
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def watch_state(data, stat):
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self.state = data.decode('ascii')
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print("Version: %s, data: %s" % (stat.version, self.state))
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@zk.DataWatch(self.zkey + '/cpucount')
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def watch_cpucount(data, stat):
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self.cpucount = data.decode('ascii')
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print("Version: %s, data: %s" % (stat.version, self.cpucount))
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@zk.DataWatch(self.zkey + '/cpuload')
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def watch_cpuload(data, stat):
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self.cpuload = data.decode('ascii')
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print("Version: %s, data: %s" % (stat.version, self.cpuload))
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@zk.DataWatch(self.zkey + '/memfree')
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def watch_memfree(data, stat):
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self.memfree = data.decode('ascii')
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print("Version: %s, data: %s" % (stat.version, self.memfree))
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