502 lines
21 KiB
Python
502 lines
21 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, psutil, socket, time, libvirt, kazoo.client, threading, subprocess
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import pvcd.ansiiprint as ansiiprint
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import pvcd.zkhandler as zkhandler
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class NodeInstance():
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# Initialization function
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def __init__(self, this_node, name, t_node, s_domain, zk_conn, config):
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# Passed-in variables on creation
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self.zk_conn = zk_conn
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self.config = config
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self.this_node = this_node
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self.name = name
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self.daemon_state = 'stop'
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self.domain_state = 'ready'
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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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self.ipmi_hostname = self.config['ipmi_hostname']
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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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self.inflush = False
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# Zookeeper handlers for changed states
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@zk_conn.DataWatch('/nodes/{}/daemonstate'.format(self.name))
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def watch_hypervisor_daemonstate(data, stat, event=""):
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try:
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self.daemon_state = data.decode('ascii')
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except AttributeError:
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self.daemon_state = 'stop'
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@zk_conn.DataWatch('/nodes/{}/domainstate'.format(self.name))
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def watch_hypervisor_domainstate(data, stat, event=""):
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try:
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self.domain_state = data.decode('ascii')
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except AttributeError:
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self.domain_state = 'unknown'
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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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self.unflush()
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@zk_conn.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_conn.DataWatch('/nodes/{}/memused'.format(self.name))
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def watch_hypervisor_memused(data, stat, event=""):
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try:
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self.memused = data.decode('ascii')
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except AttributeError:
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self.memused = 0
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@zk_conn.DataWatch('/nodes/{}/memalloc'.format(self.name))
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def watch_hypervisor_memalloc(data, stat, event=""):
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try:
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self.memalloc = data.decode('ascii')
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except AttributeError:
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self.memalloc = 0
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@zk_conn.DataWatch('/nodes/{}/vcpualloc'.format(self.name))
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def watch_hypervisor_vcpualloc(data, stat, event=""):
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try:
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self.vcpualloc = data.decode('ascii')
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except AttributeError:
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self.vcpualloc = 0
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@zk_conn.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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@zk_conn.DataWatch('/nodes/{}/domainscount'.format(self.name))
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def watch_hypervisor_domainscount(data, stat, event=""):
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try:
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self.domains_count = data.decode('ascii')
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except AttributeError:
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self.domains_count = 0
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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 getallocmem(self):
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return self.memalloc
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def getallocvcpu(self):
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return self.vcpualloc
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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 getdaemonstate(self):
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return self.daemon_state
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def getdomainstate(self):
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return self.domain_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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self.inflush = True
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ansiiprint.echo('Flushing node "{}" of running VMs'.format(self.name), '', 'i')
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ansiiprint.echo('Domain list: {}'.format(', '.join(self.domain_list)), '', 'c')
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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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ansiiprint.echo('Selecting target to migrate VM "{}"'.format(dom_uuid), '', 'i')
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current_hypervisor = zkhandler.readdata(self.zk_conn, '/domains/{}/hypervisor'.format(dom_uuid))
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target_hypervisor = findTargetHypervisor(self.zk_conn, 'mem', dom_uuid)
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if target_hypervisor == None:
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ansiiprint.echo('Failed to find migration target for VM "{}"; shutting down'.format(dom_uuid), '', '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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ansiiprint.echo('Migrating VM "{}" to hypervisor "{}"'.format(dom_uuid, target_hypervisor), '', '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/{}/hypervisor'.format(dom_uuid): target_hypervisor,
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'/domains/{}/lasthypervisor'.format(dom_uuid): current_hypervisor
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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 True:
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time.sleep(1)
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vm_current_state = zkhandler.readdata(self.zk_conn, '/domains/{}/state'.format(dom_uuid))
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if vm_current_state == "start":
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break
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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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def unflush(self):
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self.inflush = True
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ansiiprint.echo('Restoring node {} to active service.'.format(self.name), '', 'i')
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/domainstate'.format(self.name): 'ready' })
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fixed_domain_list = self.s_domain.copy()
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for dom_uuid in fixed_domain_list:
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try:
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last_hypervisor = zkhandler.readdata(self.zk_conn, '/domains/{}/lasthypervisor'.format(dom_uuid))
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except:
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continue
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if last_hypervisor != self.name:
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continue
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ansiiprint.echo('Setting unmigration for VM "{}"'.format(dom_uuid), '', '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/{}/hypervisor'.format(dom_uuid): self.name,
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'/domains/{}/lasthypervisor'.format(dom_uuid): ''
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})
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self.inflush = False
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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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lv_conn = libvirt.open(libvirt_name)
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if lv_conn == None:
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ansiiprint.echo('Failed to open connection to "{}"'.format(libvirt_name), '', 'e')
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return
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# Get past state and update if needed
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past_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/daemonstate'.format(self.name))
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if past_state != 'run':
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self.daemon_state = 'run'
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/daemonstate'.format(self.name): 'run' })
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else:
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self.daemon_state = 'run'
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# Toggle state management of dead VMs to restart them
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memalloc = 0
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vcpualloc = 0
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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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# Add the allocated memory to our memalloc value
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memalloc += instance.getmemory()
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vcpualloc += instance.getvcpus()
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if instance.getstate() == 'start' and instance.gethypervisor() == self.name:
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if instance.getdom() != None:
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try:
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if instance.getdom().state()[0] != libvirt.VIR_DOMAIN_RUNNING:
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raise
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except Exception as e:
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# Toggle a state "change"
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zkhandler.writedata(self.zk_conn, { '/domains/{}/state'.format(domain): instance.getstate() })
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# Ensure that any running VMs are readded to the domain_list
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running_domains = lv_conn.listAllDomains(libvirt.VIR_CONNECT_LIST_DOMAINS_ACTIVE)
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for domain in running_domains:
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domain_uuid = domain.UUIDString()
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if domain_uuid not in self.domain_list:
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self.domain_list.append(domain_uuid)
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# Set our information in zookeeper
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self.name = lv_conn.getHostname()
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self.memused = int(psutil.virtual_memory().used / 1024 / 1024)
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self.memfree = int(psutil.virtual_memory().free / 1024 / 1024)
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self.memalloc = memalloc
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self.vcpualloc = vcpualloc
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self.cpuload = os.getloadavg()[0]
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self.domains_count = len(lv_conn.listDomainsID())
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keepalive_time = int(time.time())
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try:
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zkhandler.writedata(self.zk_conn, {
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'/nodes/{}/memused'.format(self.name): str(self.memused),
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'/nodes/{}/memfree'.format(self.name): str(self.memfree),
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'/nodes/{}/memalloc'.format(self.name): str(self.memalloc),
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'/nodes/{}/vcpualloc'.format(self.name): str(self.vcpualloc),
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'/nodes/{}/cpuload'.format(self.name): str(self.cpuload),
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'/nodes/{}/runningdomains'.format(self.name): ' '.join(self.domain_list),
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'/nodes/{}/domainscount'.format(self.name): str(self.domains_count),
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'/nodes/{}/keepalive'.format(self.name): str(keepalive_time)
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})
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except:
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ansiiprint.echo('Failed to set keepalive data', '', 'e')
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return
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# Close the Libvirt connection
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lv_conn.close()
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# Display node information to the terminal
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ansiiprint.echo('{}{} keepalive{}'.format(ansiiprint.purple(), self.name, ansiiprint.end()), '', 't')
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ansiiprint.echo('{0}Active domains:{1} {2} {0}Allocated memory [MiB]:{1} {6} {0}Free memory [MiB]:{1} {3} {0}Used memory [MiB]:{1} {4} {0}Load:{1} {5}'.format(ansiiprint.bold(), ansiiprint.end(), self.domains_count, self.memfree, self.memused, self.cpuload, self.memalloc), '', 'c')
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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_daemon_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/daemonstate'.format(node_name))
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node_domain_state = zkhandler.readdata(self.zk_conn, '/nodes/{}/domainstate'.format(node_name))
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node_keepalive = int(zkhandler.readdata(self.zk_conn, '/nodes/{}/keepalive'.format(node_name)))
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except:
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node_daemon_state = 'unknown'
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node_domain_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 >6*keepalive_interval seconds
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# out-of-date while in 'start' state)
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node_deadtime = int(time.time()) - ( int(self.config['keepalive_interval']) * int(self.config['fence_intervals']) )
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if node_keepalive < node_deadtime and node_daemon_state == 'run':
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ansiiprint.echo('Node {} seems dead - starting monitor for fencing'.format(node_name), '', 'w')
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zkhandler.writedata(self.zk_conn, { '/nodes/{}/daemonstate'.format(node_name): 'dead' })
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fence_thread = threading.Thread(target=fenceNode, args=(node_name, self.zk_conn, self.config), kwargs={})
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fence_thread.start()
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# Update the arrays
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if node_daemon_state == 'run' and node_domain_state != 'flushed' 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_daemon_state != 'run' and node_domain_state != 'flushed' 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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if node_domain_state == 'flushed' 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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# Display cluster information to the terminal
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ansiiprint.echo('{}Cluster status{}'.format(ansiiprint.purple(), ansiiprint.end()), '', 't')
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ansiiprint.echo('{}Active nodes:{} {}'.format(ansiiprint.bold(), ansiiprint.end(), ' '.join(self.active_node_list)), '', 'c')
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ansiiprint.echo('{}Inactive nodes:{} {}'.format(ansiiprint.bold(), ansiiprint.end(), ' '.join(self.inactive_node_list)), '', 'c')
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ansiiprint.echo('{}Flushed nodes:{} {}'.format(ansiiprint.bold(), ansiiprint.end(), ' '.join(self.flushed_node_list)), '', 'c')
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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 hypervisors
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def getHypervisors(zk_conn, dom_uuid):
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valid_hypervisor_list = []
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full_hypervisor_list = zkhandler.listchildren(zk_conn, '/nodes')
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current_hypervisor = zkhandler.readdata(zk_conn, '/domains/{}/hypervisor'.format(dom_uuid))
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for hypervisor in full_hypervisor_list:
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daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(hypervisor))
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domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(hypervisor))
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if hypervisor == current_hypervisor:
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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_hypervisor_list.append(hypervisor)
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return valid_hypervisor_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_hypervisor = None
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hypervisor_list = getHypervisors(zk_conn, dom_uuid)
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for hypervisor in hypervisor_list:
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memalloc = int(zkhandler.readdata(zk_conn, '/nodes/{}/memalloc'.format(hypervisor)))
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memused = int(zkhandler.readdata(zk_conn, '/nodes/{}/memused'.format(hypervisor)))
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memfree = int(zkhandler.readdata(zk_conn, '/nodes/{}/memfree'.format(hypervisor)))
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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_hypervisor = hypervisor
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return target_hypervisor
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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_hypervisor = None
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hypervisor_list = getHypervisors(zk_conn, dom_uuid)
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for hypervisor in hypervisor_list:
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load = int(zkhandler.readdata(zk_conn, '/nodes/{}/load'.format(hypervisor)))
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if load < least_load:
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least_load = load
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target_hypevisor = hypervisor
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return target_hypervisor
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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_hypervisor = None
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hypervisor_list = getHypervisors(zk_conn, dom_uuid)
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for hypervisor in hypervisor_list:
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vcpus = int(zkhandler.readdata(zk_conn, '/nodes/{}/vcpualloc'.format(hypervisor)))
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if vcpus < least_vcpus:
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least_vcpus = vcpus
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target_hypervisor = hypervisor
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return target_hypervisor
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# via total VMs
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def findTargetHypervisorVMs(zk_conn, dom_uuid):
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least_vms = 9999
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target_hypervisor = None
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hypervisor_list = getHypervisors(zk_conn, dom_uuid)
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for hypervisor in hypervisor_list:
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vms = int(zkhandler.readdata(zk_conn, '/nodes/{}/domainscount'.format(hypervisor)))
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if vms < least_vms:
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least_vms = vms
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target_hypervisor = hypervisor
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return target_hypervisor
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#
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# Fence thread entry function
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#
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def fenceNode(node_name, zk_conn, config):
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failcount = 0
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# We allow exactly 3 saving throws for the host to come back online
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while failcount < 3:
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# Wait 5 seconds
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time.sleep(5)
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# Get the state
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node_daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(node_name))
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# Is it still 'dead'
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if node_daemon_state == 'dead':
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failcount += 1
|
|
ansiiprint.echo('Node "{}" failed {} saving throws'.format(node_name, failcount), '', 'w')
|
|
# It changed back to something else so it must be alive
|
|
else:
|
|
ansiiprint.echo('Node "{}" passed a saving throw; canceling fence'.format(node_name), '', 'o')
|
|
return
|
|
|
|
ansiiprint.echo('Fencing node "{}" via IPMI reboot signal'.format(node_name), '', 'e')
|
|
|
|
# Get IPMI information
|
|
ipmi_hostname = zkhandler.readdata(zk_conn, '/nodes/{}/ipmihostname'.format(node_name))
|
|
ipmi_username = zkhandler.readdata(zk_conn, '/nodes/{}/ipmiusername'.format(node_name))
|
|
ipmi_password = zkhandler.readdata(zk_conn, '/nodes/{}/ipmipassword'.format(node_name))
|
|
|
|
# Shoot it in the head
|
|
fence_status = rebootViaIPMI(ipmi_hostname, ipmi_username, ipmi_password)
|
|
# Hold to ensure the fence takes effect
|
|
time.sleep(3)
|
|
|
|
# If the fence succeeded and successful_fence is migrate
|
|
if fence_status == True and config['successful_fence'] == 'migrate':
|
|
migrateFromFencedHost(zk_conn, node_name)
|
|
# If the fence failed and failed_fence is migrate
|
|
if fence_status == False and config['failed_fence'] == 'migrate' and config['suicide_intervals'] != '0':
|
|
migrateFromFencedHost(zk_conn, node_name)
|
|
|
|
# Migrate hosts away from a fenced node
|
|
def migrateFromFencedHost(zk_conn, node_name):
|
|
ansiiprint.echo('Moving VMs from dead hypervisor "{}" to new hosts'.format(node_name), '', 'i')
|
|
dead_node_running_domains = zkhandler.readdata(zk_conn, '/nodes/{}/runningdomains'.format(node_name)).split()
|
|
for dom_uuid in dead_node_running_domains:
|
|
target_hypervisor = findTargetHypervisor(zk_conn, 'mem', dom_uuid)
|
|
|
|
ansiiprint.echo('Moving VM "{}" to hypervisor "{}"'.format(dom_uuid, target_hypervisor), '', 'i')
|
|
zkhandler.writedata(zk_conn, {
|
|
'/domains/{}/state'.format(dom_uuid): 'start',
|
|
'/domains/{}/hypervisor'.format(dom_uuid): target_hypervisor,
|
|
'/domains/{}/lasthypervisor'.format(dom_uuid): node_name
|
|
})
|
|
|
|
# Set node in flushed state for easy remigrating when it comes back
|
|
zkhandler.writedata(zk_conn, { '/nodes/{}/domainstate'.format(node_name): 'flushed' })
|
|
|
|
#
|
|
# Perform an IPMI fence
|
|
#
|
|
def rebootViaIPMI(ipmi_hostname, ipmi_user, ipmi_password):
|
|
ipmi_command = ['/usr/bin/ipmitool', '-I', 'lanplus', '-H', ipmi_hostname, '-U', ipmi_user, '-P', ipmi_password, 'chassis', 'power', 'reset']
|
|
ipmi_command_output = subprocess.run(ipmi_command, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
if ipmi_command_output.returncode == 0:
|
|
ansiiprint.echo('Successfully rebooted dead node', '', 'o')
|
|
return True
|
|
else:
|
|
ansiiprint.echo('Failed to reboot dead node', '', 'e')
|
|
return False
|