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virsh - 解析 virsh 输出

问题描述

有没有办法强制virsh以可解析的方式打印信息？喜欢json？

我想编写一个单行 shell 命令来获取 VM 的 IP 地址，但是 virsh 打印出来的方式对脚本不是很友好：

# virsh domifaddr myvm
 Name       MAC address          Protocol     Address
-------------------------------------------------------------------------------
 vnet1      52:54:00:b9:58:64    ipv4         192.168.130.156/24

我正在寻找一种方法来强制它至少不打印标题，这样我就可以轻松地从输出中获取“192.168.130.156”

这是我能做的最好的：

# virsh -q domifaddr myvm | awk '{print $4}' | cut -d/ -f 1
192.168.130.156

标签： virsh

解决方案

一种选择是安装qemu-guest-agent在您要从中提取 IP 信息的域上。

从那里，您可以在主机上执行以下命令以获取 JSON 格式的详细网络接口列表：

ubuntu@host:~$ virsh qemu-agent-command my-guest '{"execute":"guest-network-get-interfaces"}'
{"return":[{"name":"lo","ip-addresses":[{"ip-address-type":"ipv4","ip-address":"127.0.0.1","prefix":8},{"ip-address-type":"ipv6","ip-address":"::1","prefix":128}],"statistics":{"tx-packets":22,"tx-errs":0,"rx-bytes":2816,"rx-dropped":0,"rx-packets":22,"rx-errs":0,"tx-bytes":2816,"tx-dropped":0},"hardware-address":"00:00:00:00:00:00"},{"name":"eth0","ip-addresses":[{"ip-address-type":"ipv4","ip-address":"1.2.3.4","prefix":22},{"ip-address-type":"ipv6","ip-address":"abcd::1234:ee:ab12:e31d","prefix":64}],"statistics":{"tx-packets":11231,"tx-errs":0,"rx-bytes":40717370,"rx-dropped":0,"rx-packets":19744,"rx-errs":0,"tx-bytes":890354,"tx-dropped":0},"hardware-address":"01:02:00:03:04:05"}]}

您可以从那里解析您的 json。

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