virsh查看所有虚拟机，深入解析KVM虚拟化技术，virsh命令行工具全面解析及查看已启动虚拟机实操

深入解析KVM虚拟化技术，本文全面解析virsh命令行工具，并通过实操展示如何使用virsh查看所有虚拟机及已启动虚拟机的详细信息。

KVM虚拟化技术简介

KVM（Kernel-based Virtual Machine）是一种基于Linux内核的虚拟化技术，它通过在Linux内核中集成虚拟化模块，实现了对虚拟机的管理和运行，KVM具有以下特点：

1、高性能：KVM利用了硬件虚拟化技术，实现了接近物理机的性能；

2、开源：KVM是开源软件，可以免费使用和修改；

3、灵活：KVM支持多种虚拟化技术，如全虚拟化、半虚拟化等；

4、可扩展：KVM支持虚拟机动态扩展，如CPU、内存、硬盘等。

virsh命令行工具介绍

virsh是KVM提供的一个命令行工具，用于管理和控制虚拟机，它允许用户查看虚拟机列表、启动、关闭、暂停、恢复虚拟机等操作，以下是virsh命令的常用选项：

1、-h：显示帮助信息；

2、-V：显示版本信息；

3、-c：指定连接到libvirt的URI；

4、-d：指定连接到libvirt的域名；

5、--connect：指定连接到libvirt的URI；

6、--list-connections：列出所有连接到libvirt的URI；

7、--list-all：列出所有虚拟机，包括已启动、已关闭、已暂停的虚拟机。

使用virsh命令查看已启动虚拟机

以下是通过virsh命令查看已启动虚拟机的步骤：

1、打开终端；

2、输入命令：virsh list --state=running；

3、查看输出结果。

输出结果示例：

ID    Name                   State

2     testvm                 running
3     testvm2                running

在输出结果中，ID列表示虚拟机的唯一标识符，Name列表示虚拟机的名称，State列表示虚拟机的状态，通过上述命令，我们可以查看所有已启动的虚拟机。

virsh命令高级操作

1、查看虚拟机详细信息

使用以下命令查看虚拟机的详细信息：

virsh dominfo <虚拟机名称或ID>

查看虚拟机testvm的详细信息：

virsh dominfo testvm

输出结果示例：

Name:           testvm
UUID:           5c4c394a-5d8a-4e2a-8c39-5d5a5e4f7c39
OS Type:        linux
OS Version:     #1 SMP Fri Nov 6 21:19:16 UTC 2020
Host:           192.168.1.1
Architecture:   x86_64
CPU(s):         1
CPU Model:      Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
CPU Frequency:  2399.954MHz
Memory:         1024MiB
Current Memory: 1024MiB
Number of VirtIO Disks: 1

2、查看虚拟机日志

使用以下命令查看虚拟机的日志：

virsh domstat <虚拟机名称或ID>

查看虚拟机testvm的日志：

virsh domstat testvm

输出结果示例：

name: testvm
state: running
maxmem: 1024
mem: 1024
num_ids: 0
num_queues: 0
num_files: 0
num_vfs: 0
num_vnodes: 0
num_fds: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
num_fds: 0
num_vfs: 0
num_vnodes: 0
num_signals: 0
num_threads: 0
num_handles: 0
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num_threads: 0
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num_threads: 0
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num_threads: 0
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