- #Qemu img create install#
- #Qemu img create full#
- #Qemu img create Pc#
- #Qemu img create download#
- #Qemu img create windows#
Use -hda imagefile to tell QEMU to use imagefile as the hard drive image. To emulate a more modern system, use qemu-system-x86_64.
#Qemu img create Pc#
To emulate a legacy PC system, use qemu-system-i386. To get started, you only need to know a few parameters to start a virtual machine: 1. This can make QEMU difficult to use at first, but this provides flexibility in creating exactly the virtual machine that you want. QEMU uses command line options to define everything. Unlike PC emulator systems like VMware or VirtualBox, you need to “build” your virtual system by instructing QEMU to add each component of the virtual machine. To create an image file that’s about 200MB, type this: $ qemu-img create image.img 200M Run QEMU To initialize a file that you can use as a virtual C: drive, use the qemu-img command. Under QEMU, virtual drives are image files. Other media, including other hard drives or CD-ROM drives, are assigned D:, E:, and so on. A: and B: are the first and second floppy disk drives, and C: is the first hard drive. In DOS, just as in Windows, drives are represented as letters.
#Qemu img create install#
You’ll need a place to install the legacy system inside QEMU, and for that you’ll need a virtual C: drive. QEMU provides excellent system-level compatibility and support, making it an ideal and lightweight virtual machine environment.
#Qemu img create windows#
If you run Windows or macOS, the QEMU website provides packages for those platforms, too.
#Qemu img create download#
The open-source PC emulator QEMU is included by default in most mainline Linux distributions, but you can also download versions of QEMU for other Linux distributions. And that’s where system emulation comes in. Right? But what do you do on the fateful day that someone needs to access data that’s trapped in an old legacy application? If modern applications can’t read the data, you need to run the legacy system. Tested in Ubuntu 18.04, libguestfs-tools 1:1.36.13-1ubuntu3, QEMU 1:2.11+dfsg-1ubuntu7.3.That old legacy system is gone, never to be heard from again.
Libguestfs: error: /usr/bin/supermin exited with error status 1.Īfter that, without our workarounds, 18.04 (but not 16.04) fails with: libguestfs: error: tar_in: write error on directory: /:ĭue to a bug that was already fixed upstream. Into a bug report or message to the libguestfs mailing list. You can also run 'libguestfs-test-tool' and post the *complete* output
#Qemu img create full#
To see full error messages you may need to enable debugging.Įxport LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1Īnd run the command again. Sudo is not in theory required, but it is required due to an Ubuntu packaging bug unless we do a workaround: libguestfs: error: /usr/bin/supermin exited with error status 1. Now for the downside: there appears to be no Ubuntu maintainer currently and the library is generally buggy on Ubuntu. So we see that the ext4 came out significantly bigger. If you are not going to use the filesystem in a way that requires the journal, then this is just wasted overhead.Īnd it is interesting to verify that with: du -bs * Note that ext3 filesystems contain a journal, typically 1-32 MB in size. We can easily add some extra space on top of the minimum with -size-=+: virt-make-fs -format=raw -size=+8M -type=ext2 sysroot sysroot.ext2 Tells me that the image is 82% filled: /dev/loop17 1.5M 1.1M 244K 82% /home/ciro/test/guestfs/mnt Virt-make-fs defaults to minimizing the extra space, but you can use the -size flag to leave space in the filesystem if you want it. Which we can verify directly on the host with: mkdir -p mntĭev="$(sudo losetup -show -f -P sysroot.ext4)"Ī really good feature of virt-make-fs is that it automatically tries to minimize the image size if that is what we want: Virt-make-fs -format=raw -type=ext4 sysroot sysroot.ext4 This awesome tool can also make raw ext filesystems, e.g.: virt-make-fs -format=raw -type=ext2 sysroot sysroot.ext2 I am then able to mount the image inside QEMU Linux and read the file.
I then verified that QEMU can actually read it with: qemu-system-x86_64 -drive file=2,format=qcow2,if=virtio,snapshot. Note how sudo is not required, except for installation and Ubuntu bug workarounds. Virt-make-fs -format=qcow2 -type=ext2 sysroot 2 See section below.Įcho dash | sudo tee /usr/lib/x86_64-linux-gnu/guestfs/supermin.d/zz-dash-packagesĭd if=/dev/urandom of=sysroot/myfile bs=1024 count=1024 mentioned it, but here is a full example: sudo apt-get install libguestfs-tools Virt-make-fs from libguestfs qcow2 example