KVM：获取cpu、内存、磁盘信息

宿主机

操作系统和主机名

cat /etc/centos-release
cat /etc/hostname

内存使用情况

cat /proc/meminfo 或者free

cpu使用率

top -n1 | awk '/Cpu/{print $2}'

磁盘使用情况

 前端展示：

kvm虚拟机

列表显示Domain：
listDomainsID
    runningDomainIDsList  = conn.listDomainsID( )
# 返回一个列表，元素为当前所有运行中的域的ID。

numOfDomains   
    runningDomainNumbers = conn.numOfDomains( )
# 返回一个整数，为当前运行中的域的个数。 

listDefinedDomains
    defindedDomainNameList = conn.listDefinedDomains( )
# 返回一个列表，元素为当前所有已定义但未运行的域的名称。

numOfDefinedDomains
    defindedDomainNameList = conn.numOfDefinedDomains( )
# 返回一个整数，元素为当前所有已定义但未运行的域的个数。

内存使用情况

#! /usr/bin/python
import libvirt
conn = libvirt.open("qemu+tcp://192.168.1.61/system")

import json
import sys
import time

# CPU memory data
def memory_cpu_usage():
    info = {}
    id = int(sys.argv[1])
    dom = conn.lookupByID(id)
    dom.setMemoryStatsPeriod(10)
    # memory usage
    meminfo = dom.memoryStats()
    free_mem = float(meminfo['unused'])
    total_mem = float(meminfo['available'])
    used_mem = total_mem-free_mem
    mem_usage = round(((total_mem-free_mem) / total_mem)*100, 2)
    info['mem_usage'] = mem_usage
    info['mem_used'] = round(used_mem/1024/1024, 2)
    info['mem_total'] = round(total_mem/1024/1024,  2)
    info['mem_free'] = round(free_mem/1024/1024, 2)
print(memory_cpu_usage())

执行脚本文件：./mem.py 1

mem.py：python脚本文件

1：参数1表示  kvm虚拟机的id

cpu使用率：

通过调用脚本在Linux上执行

#! /usr/bin/python
import libvirt
conn = libvirt.open("qemu+tcp://192.168.1.61/system")

import json
import sys
import time

# CPU memory data
def memory_cpu_usage():
    info = {}
    id = int(sys.argv[1])
    dom = conn.lookupByID(id)
    dom.setMemoryStatsPeriod(10)
    # cpu usage
    t1 = time.time()
    c1 = int(dom.info()[4])
    time.sleep(3)
    t2 = time.time()
    c2 = int(dom.info()[4])
    c_nums = int(dom.info()[3])
    cpu_usage = round((c2 - c1) * 100 / ((t2 - t1) * c_nums * 1e9), 2)
    info['cpu_usage'] = cpu_usage
    return json.dumps(info)
print(memory_cpu_usage())

执行脚本文件：./cpu.py 1

cpu.py：python脚本文件

1：参数1表示  某台kvm虚拟机的id

磁盘使用率

virt-df             # 列出所有kvm虚拟机磁盘使用信息
virt-df kvm_1       # 列出某台kvm虚拟机磁盘使用信息

调用脚本在Linux上执行

import subprocess

libvirt_api_path = os.path.join(os.path.join(os.path.join(settings.BASE_DIR, "drm"), "api"),"commvault") + os.sep + "libvirtApi.py"
interface_existed = os.path.exists(libvirt_api_path)
if not interface_existed:
    ret = 0
    data = "libvirtApi接口文件不存在。"
else:
    result = subprocess.getstatusoutput(libvirt_api_path + ' ' + kvm_id)
　　 status， data = result
　　 print(data)

pycharm本机访问远程

 前端展示

通过libvirt远程管理虚拟机：qemu+tcp

被控端上：

修改/etc/sysconfig/libvirtd,开启以下2个配置项：

[root@node4 ~]# egrep -v "^#|^$" /etc/sysconfig/libvirtd
LIBVIRTD_CONFIG=/etc/libvirt/libvirtd.conf
LIBVIRTD_ARGS="--listen

修改配置文件
vim /etc/libvirt/libvirtd.conf
listen_tls = 0
listen_tcp = 1
tcp_port = "16509"
listen_addr = "0.0.0.0"
auth_tcp = "none"

重启libvirtd并查看监听的端口，
/etc/init.d/libvirtd restart
netstat -anltp|grep 16509
tcp   0      0 0.0.0.0:16509    0.0.0.0:*      LISTEN      28843/libvirtd

主控端上远程访问（需要确保可以访问被控端的16509 tcp端口）：

virsh -c qemu+tcp://192.168.1.61/system list --all

参考：https://www.cnblogs.com/ywxbbbbb/p/9981878.html

livirtAPI接口文档：

https://libvirt.org/docs/libvirt-appdev-guide-python/en-US/html/index.html

#!/usr/bin/python

import libvirt

conn = libvirt.open('qemu:///system')
if conn == None:
    print('Failed to open connection to qemu:///system')
    exit(1)

print('freemem:'+ str(conn.getFreeMemory()))
print('hostname:' + conn.getHostname())
print('vcpus:' + str(conn.getMaxVcpus(None)))

nodeinfo = conn.getInfo()
print('Model:'+str(nodeinfo[0]))
print('Memory size:'+str(nodeinfo[1])+'MB')
print('Number of CPUs:'+str(nodeinfo[2]))
print('MHz of CPUs:'+str(nodeinfo[3]))
print('Number of NUMA nodes:'+str(nodeinfo[4]))
print('Number of CPU sockets:'+str(nodeinfo[5]))
print('Number of CPU cores per socket:'+str(nodeinfo[6]))
print('Number of CPU threads per core:'+str(nodeinfo[7]))

numnodes = nodeinfo[4]
memlist = conn.getCellsFreeMemory(0, numnodes)
cell = 0
for cellfreemem in memlist:
    print('Node '+str(cell)+': '+str(cellfreemem)+' bytes free memory')
    cell += 1

print('Virtualization type: '+ conn.getType())
print('Version:' + str(conn.getVersion()))
print('Libvirt Version:' + str(conn.getLibVersion()))
print('Canonical URI:' + conn.getURI())
print('CPU:' + str(conn.getCPUMap()[0]), 'free:' + str(conn.getCPUMap()[1]))

stats = conn.getCPUStats(0)
print("kernel: " + str(stats['kernel']))
print("idle:   " + str(stats['idle']))
print("user:   " + str(stats['user']))
print("iowait: " + str(stats['iowait']))


dominfo = dom.info()
print(dominfo)

执行脚本文件：