Question

我正在开发openstack，我想监视虚拟机的CPU使用情况。为此，我想通过父（中央）openstack实例找到他们的PID。我用过

ps aux | grep

我确实收到了输出。但是我想确认这是否是正确的PID。他们有什么方法可以查看这个吗？

或者他们是否有其他方法可以找到虚拟机的PID？

更新。此命令不起作用。它给了我一个总是在变化的PID。它不是恒定的。谢谢

Answer 1

好的libvirt有一些接口。这里有一些python将数据提取到数据结构中：

#!/usr/bin/env python

# Modules
import subprocess
import traceback
import commands
import signal
import time
import sys
import re
import os
import getopt
import pprint



try:
    import libvirt
except:
    print "no libvirt detected"
    sys.exit(0)
from xml.dom.minidom import parseString

global instances
global virt_conn
global tick
global virt_exist

def virtstats():
    global virt_exist
    global virt_conn
    global instances
    cpu_stats = []
    if virt_exist == True:
        if virt_conn == None:
            print 'Failed to open connection to the hypervisor'
            virt_exist = False

    if virt_exist == True:

        virt_info = virt_conn.getInfo()
        for x in range(0, virt_info[2]):
            cpu_stats.append(virt_conn.getCPUStats(x,0))
        virt_capabilities = virt_conn.getCapabilities()
        domcpustats = 0
        # domcpustats = virDomain::GetcpuSTATS()
        totmem = 0
        totvcpu = 0
        totcount = 0
        vcpu_stats = []
        for id in virt_conn.listDomainsID():
            dom = virt_conn.lookupByID(id)
            totvcpu += dom.maxVcpus()
            vcpu_stats.append(dom.vcpus())
            totmem += dom.maxMemory()
            totcount += 1

        dom = parseString(virt_capabilities)
        xmlTag = dom.getElementsByTagName('model')[0].toxml()
        xmlData=xmlTag.replace('<model>','').replace('</model>','')
        for info in virt_info:
            print info
        for stat in cpu_stats:
            print "cpu %s" % stat
        for vstat in vcpu_stats:
            print "vcpu:\n"
            pprint.pprint(vstat)
        print "CPU ( %s ) Use - %s vCPUS ( %s logical processors )" % (xmlData, totvcpu, virt_info[2])
        sys.exit(0)



def main():

    try:
        global virt_conn
        global virt_exist
        virt_conn = libvirt.openReadOnly(None)
        virt_exist = True
    except:
        virt_exist = False
        print "OK: not a compute node"
        sys.exit(0)

    virtstats()

if __name__ == "__main__":
    main()

现在你从使用方面得到的是cpu time。

vcpu块基本上采用这种布局：

1st: vCPU number, starting from 0.
2nd: vCPU state.
    0: offline
    1: running
    2: blocked on resource
3rd: CPU time used in nanoseconds
4th: real CPU number

一旦你意识到libvirt中存在的问题，CPU块就很明显了。

希望有所帮助！

Answer 2

通过使用libvirt，python，lxml和lsof，如果您的虚拟实例（域）具有显示输出集，则可以恢复pid。（VNC，Spice，......）

检索显示端口
从已打开的显示端口

以下是代码：

#!/usr/bin/env python
# -*- coding: utf-8 -*-

from lxml import etree
import libvirt
from subprocess import check_output

def get_port_from_XML(xml_desc):
    tree = etree.fromstring(xml_desc)
    ports = tree.xpath('//graphics/@port')
    if len(ports):
        return ports[0]
    return None

def get_pid_from_listen_port(port):
    if port is None:
        return ''
    return check_output(['lsof', '-i:%s' % port, '-t']).replace('\n','')

conn = libvirt.openReadOnly('')
if conn is None:
    print 'Failed to open connection to the hypervisor'
    sys.exit(1)

for domain_id in conn.listDomainsID():
    domain_instance = conn.lookupByID(domain_id)
    name = domain_instance.name()
    xml_desc = domain_instance.XMLDesc(0)
    port = get_port_from_XML(xml_desc)
    pid = get_pid_from_listen_port(port)
    print '%s (port:%s) (pid:%s)' % (name, port, pid)

Answer 3

grep "79d87652-8c8e-4afa-8c13-32fbcbf98e76" --include=libvirt.xml /path/to/nova/instances -r -A 2 | grep "<name"  | cut -d " " -f 3

允许查找＆＃34;实例 - ＆＃34;可以映射到＆＃34; -name＆＃34;的ps aux输出;参数。所以你可以将openstack实例id映射到pid。

Answer 4

最简单的方法是使用cgroups：

在Ubuntu中：

cat /sys/fs/cgroup/cpuset/libvirt/qemu/<machine-name>/tasks

在openstack中查找虚拟机的PID

4 个答案: