python显示主机上的所有虚拟机和IP地址

Question

有没有办法显示在特定主机上运行的虚拟机的 IP 地址。如何使用 qemu 钩子查看主机中所有已注册的虚拟机。一种可能的方法是嗅探进出主机 NIC 的数据包。但是如何从源IP地址和目的IP地址中过滤出广播IP地址。任何人都可以提出一种可能的方法来实现这一目标。我没有为虚拟机使用静态 IP 地址。 python中的脚本将有很大帮助。甚至一个想法都会受到赞赏..

Answer 1

嗯，有几种方法可以做到这一点。不过最简单的还是使用virsh 命令行工具

这是特定于系统的，但在 Redhat 上，您可以安装 libvirt-client 软件包以获取 /usr/bin/virsh。

Here's a SO article showing how to map the MAC address of a guest to their IP 使用 arp 和 grep 的组合。

也有一些方法可以使用libvirt-python 获取这些信息，但它的代码要多得多。 Here's an example of using libvirt to connect to your hypervisor.

编辑：这里有一些真正未经测试的 Python，它应该让你开始，但需要一些修改和玩弄 100% 的工作（可能）

import libvirt  # To connect to the hypervisor
import re
import subprocess


# Connect to your local hypervisor. See https://libvirt.org/uri.html
#    for different URI's where you'd replace `None` with your
#    connection URI (like `qemu://system`)
conn = libvirt.openReadOnly(None)  # Open the hypervisor in read-only mode
# conn = libvirt.open(None)  # Open the default hypervisor in read-write mode (require
if conn == None:
    raise Exception('Failed to open connection to the hypervisor')

try:  # getting a list of all domains (by ID) on the host
    domains = conn.listDomainsID()
except:
    raise Exception('Failed to find any domains')

for domain_id in domains:
    # Open that vm
    this_vm = conn.lookupById(domain_id)
    # Grab the MAC Address from the XML definition
    #     using a regex, which may appear multiple times in the XML
    mac_addresses = re.search(r"<mac address='([A-Z0-9:]+)'", vm.XMLDesc(0)).groups()

    for mac_address in mac_addresses:
        # Now, use subprocess to lookup that macaddress in the
        #      ARP tables of the host.
        process = subprocess.Popen(['/sbin/arp', '-a'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
        process.wait()  # Wait for it to finish with the command
        for line in process.stdout:
            if mac_address in line:
                ip_address = re.search(r'(\d{1,3}.\d{1,3}.\d{1,3}.\d{1,3})', line)
                print 'VM {0} with MAC Address {1} is using IP {2}'.format(
                    vm.name(), mac_address, ip_address.groups(0)[0]
                )
             else:
                # Unknown IP Address from the ARP tables! Handle this somehow...