首先来看一下功能

  1. [root@KuaiCDN ~]# qemu-img
  2. qemu-img version 1.5.3, Copyright (c) 2004-2008 Fabrice Bellard
  3. usage: qemu-img command [command options]
  4. QEMU disk image utility
  6. Command syntax:
  7.   check [-q] [-f fmt] [--output=ofmt] [-r [leaks | all]] [-T src_cache] filename
  8.   create [-q] [-f fmt] [-o options] filename [size]
  9.   commit [-q] [-f fmt] [-t cache] filename
  10.   compare [-f fmt] [-F fmt] [-T src_cache] [-p] [-q] [-s] filename1 filename2
  11.   convert [-c] [-p] [-q] [-n] [-f fmt] [-t cache] [-T src_cache] [-O output_fmt] [-o options] [-s snapshot_name] [-S sparse_size] filename [filename2 [...]] output_filename
  12.   info [-f fmt] [--output=ofmt] [--backing-chain] filename
  13.   map [-f fmt] [--output=ofmt] filename
  14.   snapshot [-q] [-l | -a snapshot | -c snapshot | -d snapshot] filename
  15.   rebase [-q] [-f fmt] [-t cache] [-T src_cache] [-p] [-u] -b backing_file [-F backing_fmt] filename
  16.   resize [-q] filename [+ | -]size
  17.   amend [-q] [-f fmt] [-t cache] -o options filename
  1. check                检查虚拟磁盘完整性
  2. create            创建一个磁盘镜像
  3. commit            向后备磁盘提交当前的变化
  4. compare            比较两个img占用disk
  5. convert            转换
  6. info                信息
  7. map                    映射
  8. snapshot        快照管理
  9. resize            调整大小
  10. amend                修订镜像格式选项

查看创建 qcow2 格式有哪些选项

  1. qemu-img create -f qcow2 -o ?
  1. [root@KuaiCDN img]# qemu-img create -f qcow2 -o ?
  2. Supported options:
  3. size             Virtual disk size
  4. compat           Compatibility level (0.10 or 1.1)
  5. backing_file     File name of a base image
  6. backing_fmt      Image format of the base image
  7. encryption       Encrypt the image
  8. cluster_size     qcow2 cluster size
  9. preallocation    Preallocation mode (allowed values: off, metadata, falloc, full)
  10. lazy_refcounts   Postpone refcount updates
  11. [root@KuaiCDN img]#

创建虚拟磁盘文件

  1. qemu-img create -f qcow2 "$_system_img" 100G -o preallocation=off

查看磁盘信息

  1. [root@KuaiCDN disk]# qemu-img  info system.qcow2 
  2. image: system.qcow2
  3. file format: qcow2
  4. virtual size: 400G (429496729600 bytes)
  5. disk size: 3.0G
  6. cluster_size: 65536
  7. Format specific information:
  8.     compat: 1.1
  9.     lazy refcounts: false
  10. [root@KuaiCDN disk]#

https://blog.csdn.net/qq_40908430/article/details/104197374
https://blog.csdn.net/u012324798/article/details/109705017