56 lines
2.5 KiB
Python
56 lines
2.5 KiB
Python
#!/usr/bin/env python3
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# fencenode.py - Supplemental functions to handle fencing of dead nodes
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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, libvirt, uuid, kazoo.client, time
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#
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# Trigger function
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#
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def fence(node_name, zk):
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time.sleep(3)
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print('>>> Fencing node {} via IPMI reboot signal.'.format(node_name))
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# DO IPMI FENCE HERE
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print('>>> Moving VMs from dead hypervisor {} to new hosts.'.format(node_name))
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dead_node_running_domains = zk.get('/nodes/{}/runningdomains'.format(node_name))[0].decode('ascii').split()
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for dom_uuid in dead_node_running_domains:
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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('/domains/{}/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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print('>>> Moving VM "{}" to hypervisor "{}".'.format(dom_uuid, target_hypervisor))
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transaction = 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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transaction.commit()
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