新建磁盘 这里以腾讯云为例

只要满足镜像大小即可

挂载并下载镜像

编辑启动文件 /etc/grub.d/40_custom以实际为准

#!/bin/sh
exec tail -n +3 $0
# This file provides an easy way to add custom menu entries.  Simply type the
# menu entries you want to add after this comment.  Be careful not to change
# the 'exec tail' line above.
menuentry "Archboot" --class iso {
  set label=ARCH_202106
  set isofile='/archlinux-2021.06.01-x86_64.iso'
  loopback loop (hd0,gpt2)$isofile
  linux (loop)/arch/boot/x86_64/vmlinuz-linux archisolabel=$label img_dev=/dev/vdb1 img_loop=$isofile earlymodules=loop
  initrd (loop)/arch/boot/x86_64/initramfs-linux.img
}

具体以实际镜像、磁盘号、硬盘UEFI/MBR 为准

别忘了更新 Grub

重启

选择启动项即可