Re: how can I attach a disk to a virtual machine?

[Narcis Garcia]

On most cases, it's better like a physical block device (/dev/sda)
instead of a single partition.



Narcis Garcia

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El 13/4/21 a les 14:02, ckim@etri.re.kr ha escrit:
> Hello, qemu experts,
> 
>  
> 
> What is the method of attaching disk image to a virtual machine? I want
> to attach disk image to the virtual machine,
> 
> and it would be best if I can make it seem like a disk partition
> /dev/sda1, or like a disk(/dev/sda) with a couple of
> partitions(/dev/sda1, /dev/sda2,..)
> 
>  
> 
> I made disk image like this.
> 
> qemu-img create myimage.img 10G
> 
> and I ran qemu with this command.
> 
> qemu-system-aarch64 -M virt -cpu cortex-a72 -kernel
> ${LINUX_DIR}/arch/arm64/boot/Image -initrd initramfs.cpio.gz --append
> "root=/dev/ram init=/init nokaslr" -m 2048M -nographic -drive
> if=none,file=myimage.img,id=disk1 -device virtio-blk-device,drive=disk1
> 
>  
> 
> In the initrd image(before cpio’ed and compresed to initramfs.cpio.gz
> above), I made device files like this.
> 
> mkdir -p dev
> 
> sudo mknod dev/console c 5 1
> 
> sudo mknod dev/ram b 1 0
> 
>  
> 
> and the init script contains below lines.
> 
> #!/bin/sh
> 
> echo "### INIT SCRIPT ###"
> 
> mkdir /proc /sys /tmp
> 
> mount -t proc none /proc
> 
> mount -t sysfs none /sys
> 
> mount -t tmpfs none /tmp
> 
> echo -e "\nThis boot took $(cut -d' ' -f1 /proc/uptime) seconds\n"
> 
> exec /bin/sh
> 
>  
> 
> but after linux boots and in the bash shell, I don’t know how to use the
> disk1. I checked the disk image document, but it describes all the
> various types but not how to use it inside linux.
> 
> How can I use disk1 above? A point to a kind document will also be
> appreciated.
> 
> Thank you!
> 
> Chan Kim
> 
>  
>