164 lines
6.9 KiB
Python
164 lines
6.9 KiB
Python
#!/usr/bin/env python3
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# fencing.py - PVC daemon function library, node fencing functions
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# Part of the Parallel Virtual Cluster (PVC) system
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#
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# Copyright (C) 2018-2020 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 time
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import pvcnoded.zkhandler as zkhandler
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import pvcnoded.common as common
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import pvcnoded.VMInstance as VMInstance
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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, logger):
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# We allow exactly 6 saving throws (30 seconds) for the host to come back online or we kill it
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failcount_limit = 6
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failcount = 0
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while failcount < failcount_limit:
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# Wait 5 seconds
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time.sleep(config['keepalive_interval'])
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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
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logger.out('Node "{}" failed {}/{} saving throws'.format(node_name, failcount, failcount_limit), state='w')
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# It changed back to something else so it must be alive
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else:
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logger.out('Node "{}" passed a saving throw; canceling fence'.format(node_name), state='o')
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return
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logger.out('Fencing node "{}" via IPMI reboot signal'.format(node_name), state='w')
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# Get IPMI information
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ipmi_hostname = zkhandler.readdata(zk_conn, '/nodes/{}/ipmihostname'.format(node_name))
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ipmi_username = zkhandler.readdata(zk_conn, '/nodes/{}/ipmiusername'.format(node_name))
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ipmi_password = zkhandler.readdata(zk_conn, '/nodes/{}/ipmipassword'.format(node_name))
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# Shoot it in the head
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fence_status = rebootViaIPMI(ipmi_hostname, ipmi_username, ipmi_password, logger)
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# Hold to ensure the fence takes effect and system stabilizes
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time.sleep(config['keepalive_interval'] * 2)
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# Force into secondary network state if needed
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if node_name in config['coordinators']:
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logger.out('Forcing secondary status for node "{}"'.format(node_name), state='i')
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zkhandler.writedata(zk_conn, {'/nodes/{}/routerstate'.format(node_name): 'secondary'})
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if zkhandler.readdata(zk_conn, '/primary_node') == node_name:
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zkhandler.writedata(zk_conn, {'/primary_node': 'none'})
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# If the fence succeeded and successful_fence is migrate
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if fence_status and config['successful_fence'] == 'migrate':
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migrateFromFencedNode(zk_conn, node_name, config, logger)
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# If the fence failed and failed_fence is migrate
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if not fence_status and config['failed_fence'] == 'migrate' and config['suicide_intervals'] != '0':
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migrateFromFencedNode(zk_conn, node_name, config, logger)
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# Migrate hosts away from a fenced node
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def migrateFromFencedNode(zk_conn, node_name, config, logger):
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logger.out('Migrating VMs from dead node "{}" to new hosts'.format(node_name), state='i')
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# Get the list of VMs
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dead_node_running_domains = zkhandler.readdata(zk_conn, '/nodes/{}/runningdomains'.format(node_name)).split()
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# Set the node to a custom domainstate so we know what's happening
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zkhandler.writedata(zk_conn, {'/nodes/{}/domainstate'.format(node_name): 'fence-flush'})
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# Migrate a VM after a flush
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def fence_migrate_vm(dom_uuid):
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VMInstance.flush_locks(zk_conn, logger, dom_uuid)
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target_node = common.findTargetNode(zk_conn, config, logger, dom_uuid)
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if target_node is not None:
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logger.out('Migrating VM "{}" to node "{}"'.format(dom_uuid, target_node), state='i')
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zkhandler.writedata(zk_conn, {
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'/domains/{}/state'.format(dom_uuid): 'start',
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'/domains/{}/node'.format(dom_uuid): target_node,
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'/domains/{}/lastnode'.format(dom_uuid): node_name
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})
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else:
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logger.out('No target node found for VM "{}"; VM will autostart on next unflush/ready of current node'.format(dom_uuid), state='i')
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zkhandler.writedata(zk_conn, {
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'/domains/{}/state'.format(dom_uuid): 'stopped',
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'/domains/{}/node_autostart'.format(dom_uuid): 'True'
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})
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# Loop through the VMs
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for dom_uuid in dead_node_running_domains:
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fence_migrate_vm(dom_uuid)
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# Set node in flushed state for easy remigrating when it comes back
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zkhandler.writedata(zk_conn, {'/nodes/{}/domainstate'.format(node_name): 'flushed'})
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#
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# Perform an IPMI fence
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#
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def rebootViaIPMI(ipmi_hostname, ipmi_user, ipmi_password, logger):
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# Forcibly reboot the node
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ipmi_command_reset = '/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power reset'.format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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ipmi_reset_retcode, ipmi_reset_stdout, ipmi_reset_stderr = common.run_os_command(ipmi_command_reset)
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time.sleep(2)
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# Ensure the node is powered on
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ipmi_command_status = '/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power status'.format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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ipmi_status_retcode, ipmi_status_stdout, ipmi_status_stderr = common.run_os_command(ipmi_command_status)
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# Trigger a power start if needed
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if ipmi_status_stdout != "Chassis Power is on":
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ipmi_command_start = '/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power on'.format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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ipmi_start_retcode, ipmi_start_stdout, ipmi_start_stderr = common.run_os_command(ipmi_command_start)
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# Declare success or failure
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if ipmi_reset_retcode == 0:
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logger.out('Successfully rebooted dead node', state='o')
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return True
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else:
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logger.out('Failed to reboot dead node', state='e')
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print(ipmi_reset_stderr)
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return False
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#
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# Verify that IPMI connectivity to this host exists (used during node init)
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#
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def verifyIPMI(ipmi_hostname, ipmi_user, ipmi_password):
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ipmi_command_status = '/usr/bin/ipmitool -I lanplus -H {} -U {} -P {} chassis power status'.format(
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ipmi_hostname, ipmi_user, ipmi_password
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)
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ipmi_status_retcode, ipmi_status_stdout, ipmi_status_stderr = common.run_os_command(ipmi_command_status, timeout=2)
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if ipmi_status_retcode == 0 and ipmi_status_stdout != "Chassis Power is on":
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return True
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else:
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return False
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