272 lines
9.9 KiB
Python
272 lines
9.9 KiB
Python
#!/usr/bin/env python3
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# Daemon.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 os
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import signal
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import socket
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import psutil
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import subprocess
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import uuid
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import time
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import configparser
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import apscheduler.schedulers.background
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import pvcd.ansiiprint as ansiiprint
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import pvcd.zkhandler as zkhandler
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import pvcd.VMInstance as VMInstance
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import pvcd.NodeInstance as NodeInstance
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print(ansiiprint.bold() + "pvcd - Parallel Virtual Cluster management daemon" + ansiiprint.end())
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# Get the config file variable from the environment
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try:
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pvcd_config_file = os.environ['PVCD_CONFIG_FILE']
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except:
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print('ERROR: The "PVCD_CONFIG_FILE" environment variable must be set before starting pvcd.')
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exit(1)
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myhostname = socket.gethostname()
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myshorthostname = myhostname.split('.', 1)[0]
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mydomainname = ''.join(myhostname.split('.', 1)[1:])
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# Config values dictionary
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config_values = [
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'zookeeper',
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'keepalive_interval',
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'fence_intervals',
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'suicide_intervals',
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'successful_fence',
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'failed_fence',
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'migration_target_selector',
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'ipmi_hostname',
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'ipmi_username',
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'ipmi_password'
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]
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def readConfig(pvcd_config_file, myhostname):
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print('Loading configuration from file {}'.format(pvcd_config_file))
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o_config = configparser.ConfigParser()
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o_config.read(pvcd_config_file)
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config = {}
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try:
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entries = o_config[myhostname]
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except:
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try:
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entries = o_config['default']
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except Exception as e:
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print('ERROR: Config file is not valid!')
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exit(1)
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for entry in config_values:
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try:
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config[entry] = entries[entry]
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except:
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try:
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config[entry] = o_config['default'][entry]
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except:
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print('ERROR: Config file missing required value "{}" for this host!'.format(entry))
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exit(1)
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# Handle an empty ipmi_hostname
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if config['ipmi_hostname'] == '':
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config['ipmi_hostname'] = myshorthostname + '-lom.' + mydomainname
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return config
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# Get config
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config = readConfig(pvcd_config_file, myhostname)
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# Check that libvirtd is listening TCP
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libvirt_check_name = "qemu+tcp://127.0.0.1:16509/system"
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try:
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print('Connecting to Libvirt instance at {}'.format(libvirt_check_name))
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lv_conn = libvirt.open(libvirt_check_name)
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if lv_conn == None:
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raise
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except:
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print('ERROR: Failed to open local libvirt connection via TCP; required for PVC!')
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exit(1)
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lv_conn.close()
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# Connect to local zookeeper
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zk_conn = kazoo.client.KazooClient(hosts=config['zookeeper'])
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try:
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print('Connecting to Zookeeper instance at {}'.format(config['zookeeper']))
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zk_conn.start()
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except:
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print('ERROR: Failed to connect to Zookeeper')
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exit(1)
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# Handle zookeeper failures
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def zk_listener(state):
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global zk_conn, update_timer
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if state == kazoo.client.KazooState.SUSPENDED:
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ansiiprint.echo('Connection to Zookeeper lost; retrying', '', 'e')
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# Stop keepalive thread
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stopKeepaliveTimer(update_timer)
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while True:
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_zk_conn = kazoo.client.KazooClient(hosts=config['zookeeper'])
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try:
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_zk_conn.start()
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zk_conn = _zk_conn
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break
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except:
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time.sleep(1)
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elif state == kazoo.client.KazooState.CONNECTED:
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ansiiprint.echo('Connection to Zookeeper started', '', 'o')
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# Start keepalive thread
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update_timer = createKeepaliveTimer()
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else:
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pass
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zk_conn.add_listener(zk_listener)
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# Cleanup function
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def cleanup(signum, frame):
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ansiiprint.echo('Terminating daemon', '', 'e')
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# Set stop state in Zookeeper
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zkhandler.writedata(zk_conn, { '/nodes/{}/daemonstate'.format(myhostname): 'stop' })
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# Close the Zookeeper connection
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try:
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zk_conn.stop()
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zk_conn.close()
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except:
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pass
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# Stop keepalive thread
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stopKeepaliveTimer(update_timer)
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# Exit
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sys.exit(0)
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# Handle signals gracefully
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signal.signal(signal.SIGTERM, cleanup)
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signal.signal(signal.SIGINT, cleanup)
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signal.signal(signal.SIGQUIT, cleanup)
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# Gather useful data about our host for staticdata
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# Static data format: 'cpu_count', 'arch', 'os', 'kernel'
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staticdata = []
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staticdata.append(str(psutil.cpu_count()))
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staticdata.append(subprocess.run(['uname', '-r'], stdout=subprocess.PIPE).stdout.decode('ascii').strip())
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staticdata.append(subprocess.run(['uname', '-o'], stdout=subprocess.PIPE).stdout.decode('ascii').strip())
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staticdata.append(subprocess.run(['uname', '-m'], stdout=subprocess.PIPE).stdout.decode('ascii').strip())
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# Print static data on start
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print('{0}Node hostname:{1} {2}'.format(ansiiprint.bold(), ansiiprint.end(), myhostname))
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print('{0}IPMI hostname:{1} {2}'.format(ansiiprint.bold(), ansiiprint.end(), config['ipmi_hostname']))
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print('{0}Machine details:{1}'.format(ansiiprint.bold(), ansiiprint.end()))
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print(' {0}CPUs:{1} {2}'.format(ansiiprint.bold(), ansiiprint.end(), staticdata[0]))
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print(' {0}Arch:{1} {2}'.format(ansiiprint.bold(), ansiiprint.end(), staticdata[1]))
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print(' {0}OS:{1} {2}'.format(ansiiprint.bold(), ansiiprint.end(), staticdata[2]))
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print(' {0}Kernel:{1} {2}'.format(ansiiprint.bold(), ansiiprint.end(), staticdata[3]))
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# Check if our node exists in Zookeeper, and create it if not
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if zk_conn.exists('/nodes/{}'.format(myhostname)):
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print("Node is " + ansiiprint.green() + "present" + ansiiprint.end() + " in Zookeeper")
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# Update static data just in case it's changed
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zkhandler.writedata(zk_conn, { '/nodes/{}/staticdata'.format(myhostname): ' '.join(staticdata) })
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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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transaction = zk_conn.transaction()
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transaction.create('/nodes/{}'.format(myhostname), 'hypervisor'.encode('ascii'))
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# Basic state information
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transaction.create('/nodes/{}/daemonstate'.format(myhostname), 'stop'.encode('ascii'))
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transaction.create('/nodes/{}/domainstate'.format(myhostname), 'ready'.encode('ascii'))
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transaction.create('/nodes/{}/staticdata'.format(myhostname), ' '.join(staticdata).encode('ascii'))
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transaction.create('/nodes/{}/memfree'.format(myhostname), '0'.encode('ascii'))
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transaction.create('/nodes/{}/memused'.format(myhostname), '0'.encode('ascii'))
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transaction.create('/nodes/{}/memalloc'.format(myhostname), '0'.encode('ascii'))
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transaction.create('/nodes/{}/vcpualloc'.format(myhostname), '0'.encode('ascii'))
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transaction.create('/nodes/{}/cpuload'.format(myhostname), '0.0'.encode('ascii'))
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transaction.create('/nodes/{}/runningdomains'.format(myhostname), ''.encode('ascii'))
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transaction.create('/nodes/{}/domainscount'.format(myhostname), '0'.encode('ascii'))
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# Keepalives and fencing information
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transaction.create('/nodes/{}/keepalive'.format(myhostname), str(keepalive_time).encode('ascii'))
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transaction.create('/nodes/{}/ipmihostname'.format(myhostname), config['ipmi_hostname'].encode('ascii'))
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transaction.create('/nodes/{}/ipmiusername'.format(myhostname), config['ipmi_username'].encode('ascii'))
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transaction.create('/nodes/{}/ipmipassword'.format(myhostname), config['ipmi_password'].encode('ascii'))
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transaction.commit()
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zkhandler.writedata(zk_conn, { '/nodes/{}/daemonstate'.format(myhostname): 'init' })
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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_conn.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(myhostname, node, t_node, s_domain, zk_conn, config)
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@zk_conn.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_conn, config, 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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def createKeepaliveTimer():
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interval = int(config['keepalive_interval'])
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ansiiprint.echo('Starting keepalive timer ({} second interval)'.format(interval), '', 'o')
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update_timer = apscheduler.schedulers.background.BackgroundScheduler()
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update_timer.add_job(update_zookeeper, 'interval', seconds=interval)
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update_timer.start()
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return update_timer
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def stopKeepaliveTimer(update_timer):
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ansiiprint.echo('Stopping keepalive timer', '', 'c')
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update_timer.shutdown()
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# Start keepalive thread
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update_timer = createKeepaliveTimer()
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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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