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Bug 1364843 - libvirt should not reserve the port setting in the xml when vnc_auto_unix_socket takes effect
Summary: libvirt should not reserve the port setting in the xml when vnc_auto_unix_soc...
Keywords:
Status: CLOSED ERRATA
Alias: None
Product: Red Hat Enterprise Linux 7
Classification: Red Hat
Component: libvirt
Version: 7.3
Hardware: x86_64
OS: Linux
unspecified
unspecified
Target Milestone: rc
: ---
Assignee: Pavel Hrdina
QA Contact: Fangge Jin
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2016-08-08 02:55 UTC by yafu
Modified: 2017-08-01 23:53 UTC (History)
5 users (show)

Fixed In Version: libvirt-2.5.0-1.el7
Doc Type: If docs needed, set a value
Doc Text:
Clone Of:
Environment:
Last Closed: 2017-08-01 17:11:42 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)


Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHEA-2017:1846 0 normal SHIPPED_LIVE libvirt bug fix and enhancement update 2017-08-01 18:02:50 UTC

Description yafu 2016-08-08 02:55:26 UTC 
Description of the problem:
libvirt reserve the port setting in the guest xml when vnc_auto_unix_socket takes effect, it will make migration failed when the target host has the same port used by another guest.

How producible
100%

Version:
libvirt-2.0.0-4.el7.x86_64

Steps to reproduce:
1.Enable vnc_auto_unix_socket in the qemu.conf and restart libvirtd service:
  #cat /etc/libvirt/qemu.conf
   ...
   vnc_auto_unix_socket=1
   ...

  #systemctl restart libvirtd.service

2.Start a guest with vnc setting as follows:
  #virsh edit mig1
   ...
     <graphics type='vnc' port='5900' autoport='no'>
      <listen type='address'/>
    </graphics>
    ...

3.The live xml of guest mig1:
  #virsh dumpxml mig1
   ...
    <graphics type='vnc' socket='/var/lib/libvirt/qemu/domain-572-mig1/vnc.sock'>
      <listen type='socket' socket='/var/lib/libvirt/qemu/domain-572-mig1/vnc.sock'/>
    </graphics>
   ...

4. Check the port usage on the host, find that 5900 is not used:
  #netstat -tunlp

5.Start another guest mig2 with vnc setting as step2:
  #virsh start mig2
  error: Failed to start domain mig2
  error: internal error: Failed to reserve port 5900


Actual results:
libvirt reserve port for the guest even the vnc_auto_unix_socket take effect and the guest using socket listen type.

Expected results:
libvirt should not reserve port when the vnc_auto_unix_socket take effect.

Additional info:
1.It will make migration failed when the target host has the same port used by another guest.
Comment 2 Pavel Hrdina 2016-08-18 08:43:51 UTC 
Upstream commit:

commit f0551b9bc4ec1c379c72dbf3f1ea7daa80b18ba9
Author: Pavel Hrdina <phrdina>
Date:   Sat Aug 13 21:29:38 2016 +0200

    qemu_process: graphics: setup listen types before ports are reserved/allocated
Comment 5 Fangge Jin 2017-03-13 03:00:18 UTC 
Reproduce this bug on build libvirt-2.0.0-10.el7.x86_64

Verify PASS on build libvirt-3.1.0-2.el7.x86_64.

Steps are same as description, the second guest can start up successfully.
Comment 6 errata-xmlrpc 2017-08-01 17:11:42 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:1846
Comment 7 errata-xmlrpc 2017-08-01 23:53:19 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2017:1846
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