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#1 2014-03-16 09:20:27

bazzo
Member
Registered: 2013-05-02
Posts: 3

KVM/libvirt console install - bug?

Hi guys,

KVM/libvirt is working great for me if I create a new VM manually - i.e. boot the VM from a Linux install ISO, and use the virt-manager GUI or connect via VNC to manually click through the install.

This approach doesn't scale very well though.  Using KVM/libvirt on CentOS, I've got used to being able to script entirely unattended installs via Kickstart files and the serial console interface to the VM.

On a CentOS 6 host, for example, I can do something like this:

sudo virt-install --name=myGuestVM --ram=2048 --vcpus=1 --os-variant=rhel6 --nographics \
 --location http://mirrors.kernel.org/centos/6/os/x86_64 --network=bridge=br0,model=virtio \
 --disk path=/dev/mapper/kvm-myGuestVM--root,bus=virtio --disk path=/dev/mapper/kvm-myGuestVM--swap,bus=virtio \
 --initrd-inject="/tmp/myGuestVM.ks" --extra-args="ks=file:/myGuestVM.ks console=tty0 console=ttyS0,115200"

Obviously I create the LVM partitions first, and point to a valid KickStart file.

I then go and have a coffee, while the new VM is installed automatically over the network with the latest CentOS 6 OS, and come back to a working new VM.

But running the exact same process on my (fully updated) Arch machine results in an error that I just cannot track down:

Starting install...
Retrieving file .treeinfo...                                |  728 B  00:00 !!!
Retrieving file vmlinuz...                                  | 7.9 MB  00:05 !!!
Retrieving file initrd.img...                               |  64 MB  00:26 !!!
ERROR    [Errno 2] No such file or directory
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///system start myGuestVM
otherwise, please restart your installation.

Since the VM was never initialised, that virsh line obviously doesn't work.

Using the "-d" (debug) switch for virt-install doesn't help much, either:

Starting install...
[Sun, 16 Mar 2014 16:13:23 virt-install 24109] DEBUG (distroinstaller:412) Using scratchdir=/var/lib/libvirt/boot
[Sun, 16 Mar 2014 16:13:23 virt-install 24109] DEBUG (urlfetcher:293) Finding distro store for location=http://mirrors.kernel.org/centos/6/os/x86_64
[Sun, 16 Mar 2014 16:13:23 virt-install 24109] DEBUG (urlfetcher:99) Fetching URI: http://mirrors.kernel.org/centos/6/os/x86_64.treeinfo
[Sun, 16 Mar 2014 16:13:23 virt-install 24109] DEBUG (urlfetcher:110) Saved file to /var/lib/libvirt/boot/virtinst-.treeinfo.ESVS8P
Retrieving file .treeinfo...                                |  728 B  00:00 !!!
[Sun, 16 Mar 2014 16:13:23 virt-install 24109] DEBUG (urlfetcher:99) Fetching URI: http://mirrors.kernel.org/centos/6/os/x86_64/images/pxeboot/vmlinuz
[Sun, 16 Mar 2014 16:13:27 virt-install 24109] DEBUG (urlfetcher:110) Saved file to /var/lib/libvirt/boot/virtinst-vmlinuz.BdtxS7
Retrieving file vmlinuz...                                  | 7.9 MB  00:03 !!!
[Sun, 16 Mar 2014 16:13:27 virt-install 24109] DEBUG (urlfetcher:99) Fetching URI: http://mirrors.kernel.org/centos/6/os/x86_64/images/pxeboot/initrd.img
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (urlfetcher:110) Saved file to /var/lib/libvirt/boot/virtinst-initrd.img.p7kQH2
Retrieving file initrd.img...                               |  64 MB  00:26 !!!
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (distroinstaller:233) Copying /tmp/myGuestVM.ks to the initrd.
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (distroinstaller:236) Appending to the initrd.
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (installer:187) Removing /var/lib/libvirt/boot/virtinst-vmlinuz.BdtxS7
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (installer:187) Removing /var/lib/libvirt/boot/virtinst-initrd.img.p7kQH2
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (cli:234)   File "/usr/share/virt-manager/virt-install", line 879, in <module>
    sys.exit(main())
  File "/usr/share/virt-manager/virt-install", line 873, in main
    start_install(guest, continue_inst, options)
  File "/usr/share/virt-manager/virt-install", line 591, in start_install
    fail(e, do_exit=False)
  File "/usr/share/virt-manager/virtinst/cli.py", line 234, in fail
    logging.debug("".join(traceback.format_stack()))

[Sun, 16 Mar 2014 16:13:54 virt-install 24109] ERROR (cli:235) [Errno 2] No such file or directory
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (cli:237)
Traceback (most recent call last):
  File "/usr/share/virt-manager/virt-install", line 563, in start_install
    dom = guest.start_install(meter=meter, noboot=options.noreboot)
  File "/usr/share/virt-manager/virtinst/guest.py", line 381, in start_install
    self._prepare_install(meter, dry)
  File "/usr/share/virt-manager/virtinst/guest.py", line 274, in _prepare_install
    util.make_scratchdir(self.conn, self.type))
  File "/usr/share/virt-manager/virtinst/installer.py", line 201, in prepare
    self._prepare(guest, meter, scratchdir)
  File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 438, in _prepare
    self._prepare_kernel_url(guest, fetcher)
  File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 357, in _prepare_kernel_url
    fetcher.scratchdir)
  File "/usr/share/virt-manager/virtinst/distroinstaller.py", line 245, in _perform_initrd_injections
    cwd=tempdir)
  File "/usr/lib/python2.7/subprocess.py", line 709, in __init__
    errread, errwrite)
  File "/usr/lib/python2.7/subprocess.py", line 1326, in _execute_child
    raise child_exception
OSError: [Errno 2] No such file or directory
[Sun, 16 Mar 2014 16:13:54 virt-install 24109] DEBUG (cli:248) Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///system start myGuestVM
otherwise, please restart your installation.
Domain installation does not appear to have been successful.
If it was, you can restart your domain by running:
  virsh --connect qemu:///system start myGuestVM
otherwise, please restart your installation.

Any ideas? Or should I just open a bug report?

Last edited by bazzo (2014-03-16 09:25:27)

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#2 2014-06-04 21:42:13

roberttstephens
Member
Registered: 2014-06-04
Posts: 2

Re: KVM/libvirt console install - bug?

I'm getting this error as well. The error seems to be related to --initrd-inject.

The following produces an error

virt-install --connect=qemu:///system \                                         
             --location=ftp://ftp.us.debian.org/debian/dists/stable/main/installer-amd64 \
             --initrd-inject=/home/myname/tmp/preseed/preseed.cfg \              
             --extra-args="auto" \                                              
             --name debian_stable_preseed --ram=512 \                                             
             --disk=pool=default,size=5,format=qcow2,bus=virtio

However the following starts installing.

virt-install --connect=qemu:///system \                                         
             --location=ftp://ftp.us.debian.org/debian/dists/stable/main/installer-amd64 \
             --extra-args="auto" \                                              
             --name debian_stable_preseed --ram=512 \                                             
             --disk=pool=default,size=5,format=qcow2,bus=virtio

I might dig into this some more later.

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#3 2014-06-05 05:48:17

bazzo
Member
Registered: 2013-05-02
Posts: 3

Re: KVM/libvirt console install - bug?

I figured out a workaround since posting this, at least for CentOS/RHEL installs - if I upload the kickstart file to a web server and load it via HTTP instead of via the initrd, it works fine:

sudo virt-install --name=myGuestVM --ram=2048 --vcpus=1 --os-variant=rhel6 --nographics \
 --location http://mirrors.kernel.org/centos/6/os/x86_64 --network=bridge=br0,model=virtio \
 --disk path=/dev/mapper/kvm-myGuestVM--root,bus=virtio --disk path=/dev/mapper/kvm-myGuestVM--swap,bus=virtio \
 --extra-args="ks=http://10.0.0.101/myGuestVM.ks console=tty0 console=ttyS0,115200"

Any attempt to use --initrd-inject brings back that hopelessly vague error though:

ERROR (cli:235) [Errno 2] No such file or directory

I am guessing that libvirt is either unable to load the ks file from /tmp, or unable to open the initrd file in order to modify it. Neither of those things make much sense to me though.

It would be immensely useful if the virt-install error handler would actually report WHICH file or directory it was trying to open...

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#4 2014-06-05 11:19:04

roberttstephens
Member
Registered: 2014-06-04
Posts: 2

Re: KVM/libvirt console install - bug?

Thanks for updating. I also found the same work around. For other people that find this thread, here is an example of preseeding debian stable.

virt-install --connect=qemu:///system \
             --location=ftp://ftp.us.debian.org/debian/dists/stable/main/installer-amd64 \
	     --os-type=linux \
	     --virt-type=kvm \
             --extra-args="\
	       auto=true priority=critical url=http://192.168.122.1/preseed.cfg" \
             --name debian_stable_preseed --ram=512 \
             --disk=pool=default,size=5,format=qcow2,bus=virtio

I also checked the latest code from the virt-manager repo https://git.fedorahosted.org/git/virt-manager.git . It still has this issue.

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#5 2014-06-23 11:13:07

Maesto
Member
Registered: 2014-06-23
Posts: 6

Re: KVM/libvirt console install - bug?

Seems the missing file is cpio.
Installing cpio via pacman fixed the Problem for me.

Should be in the deps from virt-manager in some days.

Greetings

Lucas

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#6 2014-06-23 21:23:14

bazzo
Member
Registered: 2013-05-02
Posts: 3

Re: KVM/libvirt console install - bug?

I can confirm that installing the cpio package fixed my issue.

Many, many thanks to Maesto.

Last edited by bazzo (2014-06-23 21:23:23)

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