nova instance console log empty

Bug #1667033 reported by Ryan Beisner on 2017-02-22
This bug affects 3 people
Affects Status Importance Assigned to Milestone
OpenStack Compute (nova)
libvirt (Ubuntu)
nova (Ubuntu)
qemu (Ubuntu)
Christian Ehrhardt 

Bug Description

Nova instance console log is empty on Xenial-Ocata with libvirt 2.5.0-3ubuntu2~cloud0

James Page (james-page) wrote :
James Page (james-page) wrote :

Serial console snippet from a trusty/mitaka install

    <serial type='file'>
      <source path='/srv/nova/instances/0a33a19d-a310-4861-bf16-1bd5df8448b7/console.log'/>
      <target port='0'/>
      <alias name='serial0'/>
    <serial type='pty'>
      <source path='/dev/pts/21'/>
      <target port='1'/>
      <alias name='serial1'/>
    <console type='file'>
      <source path='/srv/nova/instances/0a33a19d-a310-4861-bf16-1bd5df8448b7/console.log'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>

James Page (james-page) wrote :

Serial console snippet from xenial/ocata

    <serial type='pty'>
      <source path='/dev/pts/0'/>
      <log file='/var/lib/nova/instances/5d80faa1-9bda-451e-a1c8-8fc6481d6ba6/console.log' append='off'/>
      <target port='0'/>
      <alias name='serial0'/>
    <console type='pty' tty='/dev/pts/0'>
      <source path='/dev/pts/0'/>
      <log file='/var/lib/nova/instances/5d80faa1-9bda-451e-a1c8-8fc6481d6ba6/console.log' append='off'/>
      <target type='serial' port='0'/>
      <alias name='serial0'/>

James Page (james-page) wrote :

Note that this is with OpenStack Ocata, with the libvirt from zesty which is version 2.5.0.

This should be using the virtlogd capabilities of libvirt/qemu, but for some reason that's not actually working.

Changed in nova (Ubuntu):
status: New → Triaged
importance: Undecided → Critical
James Page (james-page) wrote :

Might be related to bug 1599214 however qemu in use is 2.8.0 (and the empty log file issue should have been fixed in 2.7.0)

James Page (james-page) wrote :

OK so a bit more information

I was able to virsh console to a running domain, login to the instance, reboot it and then disconnect from the console.

For the duration of the access, the console.log file was populated with the same data; after disconnect, the log file gets no more data.

Ryan Harper (raharper) wrote :

I think this is the relevant qemu patch that we might need:



Changed in qemu (Ubuntu):
status: New → Triaged
importance: Undecided → High
assignee: nobody → ChristianEhrhardt (paelzer)

Thanks Ryan for doing all the search work!

@James - I have prepared a preliminary zesty version in a ppa at (currently building)

Since you very likely need that for your Xenial backport instead of the zesty version I pushed the commits to my LP repo, and you might want to experiment with those two on top of yours then:

There are a lot of CVEs for qemu 2.8 and I wanted to wait for a new Debian release to pick those up. That will still get into zesty release, but it could take a while, and I assume your schedule might be more aggressive.
I you happen to need this content here in zesty earlier please let me know and I'll plan for an extra upload/testing cycle.

James Page (james-page) on 2017-02-23
Changed in nova:
status: New → Invalid
Changed in nova (Ubuntu):
status: Triaged → Invalid
Changed in libvirt (Ubuntu):
status: New → Invalid

If anybody wants to test, can be done against zesty ppa

Launchpad Janitor (janitor) wrote :

This bug was fixed in the package qemu - 1:2.8+dfsg-3ubuntu1

qemu (1:2.8+dfsg-3ubuntu1) zesty; urgency=medium

  * Merge with Debian;
    This fixes several CVEs that were reported against qemu 2.8 and also
    includes a few important functional backports (LP: #1667033); remaining
    - add qemu-kvm init script and defaults file
    - d/rules, d/qemu-kvm-init: add and install script loading kvm
      modules and handling /etc/default/qemu-kvm
    - qemu-system-common.preinst: add kvm group if needed
    - Enable nesting by default on intel.
      - set default module option
      - re-load kvm_intel.ko if it was loaded without nested=1
      - d/p/ubuntu/expose-vmx_qemu64cpu.patch: enable nested kvm by
        default in qemu64 cpu type.
    - Enable svm by default for qemu64 on amd
    - d/p/ubuntu/define-ubuntu-machine-types.patch, d/qemu-system-x86.NEWS:
      define distro machine types to ease future live vm migration (includes
      all former follow up fixes).
    - Make qemu-system-common depend on qemu-block-extra
    - Make qemu-utils depend on qemu-block-extra
    - s390x support
      - Create qemu-system-s390x package
      - Include s390-ccw.img firmware
    - qemu-system-common.postinst:
      - change acl placed by udev, and add udevadm trigger.
    - d/qemu-kvm-init, d/kvm.powerpc, d/control-in: check SMT on ppc64el
    - Several changes were applied but missing in the changelog so far
      - d/qemu-system-ppc.links provide usr/bin/qemu-system-ppc64le symlink
      - arch aware kvm wrapper
      - update VCS links
      - let qemu-utils recommend sharutils
      - disable x32 architecture
    - Enable seccomp for ppc64el
    - Enable numa support for s390x
    - d/qemu-system-common.qemu-kvm.init: fix lintian error type
    - d/qemu-system-common.postinst: fix lintian error type
    - Transition qemu-kvm to a systemd unit
    - d/qemu-kvm-init, d/kvm.powerpc ppc64el SMT check avoid unwanted output
    - d/qemu-kvm-init, d/kvm.powerpc ppc64el SMT check keep output local so
      that it shows up where the user expects (sytemctl status, kvm stdout)
    - d/qemu-kvm-init ppc64el warn on expected second level kvm-hv load failure
    - add arch aware kvm wrapper for s390x
  * Dropped Changes (in Debian now):
    - d/p/ubuntu/ctrl-a-b-fix-fb5e19d2.patch: char: fix ctrl-a b not working
    - d/control-in: change dependencies for fix of wrong acl for newly
      created device node on ubuntu
    - have qemu-system-arm suggest: qemu-efi; this should be a stronger
      relationship, but qemu-efi is still in universe right now.
    - Disable glusterfs (Universe dependency)
    - no more skip disable libiscsi on Ubuntu
    - d/rules, d/control-in: avoid people editing d/control
  * Added Changes:
    - d/control: bump libseccomp-dev dependency as enabling libseccomp for
      power makes 2.3 the minimum level.

 -- Christian Ehrhardt <email address hidden> Wed, 01 Mar 2017 14:23:16 +0100

Changed in qemu (Ubuntu):
status: Triaged → Fix Released
Tytus Kurek (tkurek) wrote :


I've just tried with "2.8+dfsg-2ubuntu2~ppa1" version from "" PPA and the log keeps being empty.

Hi Tytus,
this ppa was only meant to pretest things for Xenial + Cloud Archive Ocata.
In Xenial there is a newer Qemu version SRUed in the meantime than the ppa had, so even enabling it won't install anything that fixes it for you - I'll kill the ppa to avoid this misunderstanding next time.

The situation as of now should be the following:
- In Zesty it should be fixed since 1:2.8+dfsg-3ubuntu1
- In Xenial+UCA-Ocata should be on 1:2.8+dfsg-3ubuntu2~cloud0 atm and fixed as well

Could you check the latter or newer and report back here?

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