258 lines
8.0 KiB
Python
258 lines
8.0 KiB
Python
#!/usr/bin/env python3
|
|
|
|
# common.py - PVC daemon function library, common fuctions
|
|
# Part of the Parallel Virtual Cluster (PVC) system
|
|
#
|
|
# Copyright (C) 2018-2019 Joshua M. Boniface <joshua@boniface.me>
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <https://www.gnu.org/licenses/>.
|
|
#
|
|
###############################################################################
|
|
|
|
import subprocess
|
|
import threading
|
|
import signal
|
|
import os
|
|
import time
|
|
import shlex
|
|
|
|
import pvcd.log as log
|
|
import pvcd.zkhandler as zkhandler
|
|
|
|
class OSDaemon(object):
|
|
def __init__(self, command_string, environment, logfile):
|
|
command = shlex.split(command_string)
|
|
# Set stdout to be a logfile if set
|
|
if logfile:
|
|
stdout = open(logfile, 'a')
|
|
else:
|
|
stdout = subprocess.PIPE
|
|
|
|
# Invoke the process
|
|
self.proc = subprocess.Popen(
|
|
command,
|
|
env=environment,
|
|
stdout=stdout,
|
|
stderr=stdout,
|
|
)
|
|
|
|
# Signal the process
|
|
def signal(self, sent_signal):
|
|
signal_map = {
|
|
'hup': signal.SIGHUP,
|
|
'int': signal.SIGINT,
|
|
'term': signal.SIGTERM,
|
|
'kill': signal.SIGKILL
|
|
}
|
|
self.proc.send_signal(signal_map[sent_signal])
|
|
|
|
def run_os_daemon(command_string, environment=None, logfile=None):
|
|
daemon = OSDaemon(command_string, environment, logfile)
|
|
return daemon
|
|
|
|
# Run a oneshot command, optionally without blocking
|
|
def run_os_command(command_string, background=False, environment=None, timeout=None):
|
|
command = shlex.split(command_string)
|
|
if background:
|
|
def runcmd():
|
|
try:
|
|
subprocess.run(
|
|
command,
|
|
env=environment,
|
|
timeout=timeout,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE,
|
|
)
|
|
except subprocess.TimeoutExpired:
|
|
pass
|
|
thread = threading.Thread(target=runcmd, args=())
|
|
thread.start()
|
|
return 0, None, None
|
|
else:
|
|
try:
|
|
command_output = subprocess.run(
|
|
command,
|
|
env=environment,
|
|
timeout=timeout,
|
|
stdout=subprocess.PIPE,
|
|
stderr=subprocess.PIPE,
|
|
)
|
|
retcode = command_output.returncode
|
|
except subprocess.TimeoutExpired:
|
|
retcode = 128
|
|
|
|
try:
|
|
stdout = command_output.stdout.decode('ascii')
|
|
except:
|
|
stdout = ''
|
|
try:
|
|
stderr = command_output.stderr.decode('ascii')
|
|
except:
|
|
stderr = ''
|
|
return retcode, stdout, stderr
|
|
|
|
# Reload the firewall rules of the system
|
|
def reload_firewall_rules(logger, rules_file):
|
|
logger.out('Reloading firewall configuration', state='o')
|
|
retcode, stdout, stderr = run_os_command('/usr/sbin/nft -f {}'.format(rules_file))
|
|
if retcode != 0:
|
|
logger.out('Failed to reload configuration: {}'.format(stderr), state='e')
|
|
|
|
# Create IP address
|
|
def createIPAddress(ipaddr, cidrnetmask, dev):
|
|
run_os_command(
|
|
'ip address add {}/{} dev {}'.format(
|
|
ipaddr,
|
|
cidrnetmask,
|
|
dev
|
|
)
|
|
)
|
|
run_os_command(
|
|
'arping -W 0.1 -A -c3 -I {dev} -P -U -S {ip} {ip}'.format(
|
|
dev=dev,
|
|
ip=ipaddr
|
|
),
|
|
background=True
|
|
)
|
|
|
|
# Remove IP address
|
|
def removeIPAddress(ipaddr, cidrnetmask, dev):
|
|
run_os_command(
|
|
'ip address delete {}/{} dev {}'.format(
|
|
ipaddr,
|
|
cidrnetmask,
|
|
dev
|
|
)
|
|
)
|
|
|
|
#
|
|
# Find a migration target
|
|
#
|
|
def findTargetNode(zk_conn, config, dom_uuid):
|
|
# Determine VM node limits; set config value if read fails
|
|
try:
|
|
node_limit = zkhandler.readdata(zk_conn, '/domains/{}/node_limit'.format(dom_uuid)).split(',')
|
|
if not any(node_limit):
|
|
node_limit = ''
|
|
except:
|
|
node_limit = ''
|
|
zkhandler.writedata(zk_conn, { '/domains/{}/node_limit'.format(dom_uuid): '' })
|
|
|
|
# Determine VM search field or use default; set config value if read fails
|
|
try:
|
|
search_field = zkhandler.readdata(zk_conn, '/domains/{}/node_selector'.format(dom_uuid))
|
|
except:
|
|
search_field = config['migration_target_selector']
|
|
zkhandler.writedata(zk_conn, { '/domains/{}/node_selector'.format(dom_uuid): config['migration_target_selector'] })
|
|
|
|
# Execute the search
|
|
if search_field == 'mem':
|
|
return findTargetNodeMem(zk_conn, node_limit, dom_uuid)
|
|
if search_field == 'load':
|
|
return findTargetNodeLoad(zk_conn, node_limit, dom_uuid)
|
|
if search_field == 'vcpus':
|
|
return findTargetNodeVCPUs(zk_conn, node_limit, dom_uuid)
|
|
if search_field == 'vms':
|
|
return findTargetNodeVMs(zk_conn, node_limit, dom_uuid)
|
|
|
|
# Nothing was found
|
|
return None
|
|
|
|
# Get the list of valid target nodes
|
|
def getNodes(zk_conn, node_limit, dom_uuid):
|
|
valid_node_list = []
|
|
full_node_list = zkhandler.listchildren(zk_conn, '/nodes')
|
|
current_node = zkhandler.readdata(zk_conn, '/domains/{}/node'.format(dom_uuid))
|
|
|
|
for node in full_node_list:
|
|
if node_limit and node not in node_limit:
|
|
continue
|
|
|
|
daemon_state = zkhandler.readdata(zk_conn, '/nodes/{}/daemonstate'.format(node))
|
|
domain_state = zkhandler.readdata(zk_conn, '/nodes/{}/domainstate'.format(node))
|
|
|
|
if node == current_node:
|
|
continue
|
|
|
|
if daemon_state != 'run' or domain_state != 'ready':
|
|
continue
|
|
|
|
valid_node_list.append(node)
|
|
|
|
return valid_node_list
|
|
|
|
# via free memory (relative to allocated memory)
|
|
def findTargetNodeMem(zk_conn, node_limit, dom_uuid):
|
|
most_allocfree = 0
|
|
target_node = None
|
|
|
|
node_list = getNodes(zk_conn, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
memalloc = int(zkhandler.readdata(zk_conn, '/nodes/{}/memalloc'.format(node)))
|
|
memused = int(zkhandler.readdata(zk_conn, '/nodes/{}/memused'.format(node)))
|
|
memfree = int(zkhandler.readdata(zk_conn, '/nodes/{}/memfree'.format(node)))
|
|
memtotal = memused + memfree
|
|
allocfree = memtotal - memalloc
|
|
|
|
if allocfree > most_allocfree:
|
|
most_allocfree = allocfree
|
|
target_node = node
|
|
|
|
return target_node
|
|
|
|
# via load average
|
|
def findTargetNodeLoad(zk_conn, node_limit, dom_uuid):
|
|
least_load = 9999
|
|
target_node = None
|
|
|
|
node_list = getNodes(zk_conn, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
load = int(zkhandler.readdata(zk_conn, '/nodes/{}/load'.format(node)))
|
|
|
|
if load < least_load:
|
|
least_load = load
|
|
target_hypevisor = node
|
|
|
|
return target_node
|
|
|
|
# via total vCPUs
|
|
def findTargetNodeVCPUs(zk_conn, node_limit, dom_uuid):
|
|
least_vcpus = 9999
|
|
target_node = None
|
|
|
|
node_list = getNodes(zk_conn, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
vcpus = int(zkhandler.readdata(zk_conn, '/nodes/{}/vcpualloc'.format(node)))
|
|
|
|
if vcpus < least_vcpus:
|
|
least_vcpus = vcpus
|
|
target_node = node
|
|
|
|
return target_node
|
|
|
|
# via total VMs
|
|
def findTargetNodeVMs(zk_conn, node_limit, dom_uuid):
|
|
least_vms = 9999
|
|
target_node = None
|
|
|
|
node_list = getNodes(zk_conn, node_limit, dom_uuid)
|
|
for node in node_list:
|
|
vms = int(zkhandler.readdata(zk_conn, '/nodes/{}/domainscount'.format(node)))
|
|
|
|
if vms < least_vms:
|
|
least_vms = vms
|
|
target_node = node
|
|
|
|
return target_node
|