Help with building QEMU Xen based template

[Ryan Chewning]

Hi,

I'm attempting to build a template on a Centos 7 XEN 4.10 hypervisor but keep encountering issues with Qemu. The build errors with the following error message. I've attached the packer config I'm using if there's anything I should change.

==> qemu: Starting VM, booting from CD-ROM

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Qemu --version output: QEMU emulator version 2.10.2

2019/04/03 14:04:41 packer: Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Qemu version: 2.10.2

    qemu: view the screen of the VM, connect via VNC without a password to

    qemu: vnc://127.0.0.1:5957

    qemu: The VM will be run headless, without a GUI. If you want to

    qemu: view the screen of the VM, connect via VNC without a password to

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Qemu Builder has no floppy files, not attaching a floppy.

    qemu: vnc://127.0.0.1:5957

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Executing /usr/lib64/xen/bin/qemu-system-i386: []string{"-vnc", "127.0.0.1:0", "-name", "ol7-app-template", "-drive", "file=/var/lib/xen/ol7-app-template/ol7-app-template,if=virtio,cache=writeback,discard=ignore,format=raw", "-boot", "once=d", "-m", "2048M", "-machine", "type=xenfv,accel=xen", "-netdev", "user,id=user.0,hostfwd=tcp::2226-:22", "-device", "rtl8139,netdev=user.0", "-cdrom", "/home/rchewni/ol7_trimble/iso/ol-7.6_x86-64.iso"}

==> qemu: Overriding defaults Qemu arguments with QemuArgs...

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Started Qemu. Pid: 6457

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Qemu stderr: failed to get HVM_PARAM_IOREQ_PFN

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Qemu stderr: qemu-system-i386: failed to get ioreq server info: error 22 handle=0x55814d3e5ef0

2019/04/03 14:04:41 packer: 2019/04/03 14:04:41 Qemu stderr: qemu-system-i386: xen hardware virtual machine initialisation failed

2019/04/03 14:04:41 ui error: ==> qemu: Error launching VM: Qemu failed to start. Please run with PACKER_LOG=1 to get more info.

==> qemu: Error launching VM: Qemu failed to start. Please run with PACKER_LOG=1 to get more info.

[Alvaro Miranda Aguilera]

hello.

have you got any reference that this should work?

Is your computer where you run packer a physical machine? its a VM?

i notice the qemu binary you using is i386 but the dvd iso is 64 bits, should that work?

Can you try with a 32bit iso and then with both qemu-image and a iso 64 bits?

If you share some hints how to setup a new machine so this can be run, I can have a look at it.

thanks

alvaro

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Alvaro

[Ryan Chewning]

I was expecting this build to work based on the documentation for Packer -> https://www.packer.io/docs/builders/qemu.html

Xen uses a forked version of Qemu. We've never tried to build for Xen before but had assumed that it would work correctly.  But per discussion on the Xen Mailing list and in issue #7349 (https://github.com/hashicorp/packer/issues/7349)  since xen moved their tool stack to using the xl framework qemu is no longer able to start a domain by itself, especially if the domain is using HVM.

Based on what I've found, unless someone else has a different experience, it appears that Packer can no longer build for Xen. A separate plugin that uses the xl tool set would probably need to be written.

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