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Bug 1950255 - guest's hostname can not be resolved by the libvirt_nss module
Summary: guest's hostname can not be resolved by the libvirt_nss module
Keywords:
Status: CLOSED NOTABUG
Alias: None
Product: Red Hat Enterprise Linux 9
Classification: Red Hat
Component: libvirt
Version: 9.0
Hardware: Unspecified
OS: Unspecified
unspecified
medium
Target Milestone: beta
: ---
Assignee: Virtualization Maintenance
QA Contact: Virtualization Bugs
URL:
Whiteboard:
Depends On: 1918673
Blocks:
TreeView+ depends on / blocked
 
Reported: 2021-04-16 08:27 UTC by smitterl
Modified: 2021-04-19 08:07 UTC (History)
6 users (show)

Fixed In Version:
Doc Type: If docs needed, set a value
Doc Text:
Clone Of: 1918673
Environment:
Last Closed: 2021-04-19 08:07:57 UTC
Type: Bug
Target Upstream Version:
Embargoed:
pm-rhel: mirror+

Attachments (Terms of Use)

Description smitterl 2021-04-16 08:27:46 UTC 
+++ This bug was initially created as a clone of Bug #1918673 +++

Description of problem:
guest's hostname can not be resolved by the libvirt_nss module

Version-Release number of selected component (if applicable):
libvirt-7.0.0-1.module+el8.4.0+9464+3e71831a.x86_64

How reproducible:
100%

Steps to Reproduce:
1. install the libvirt-nss package
# rpm -q libvirt-nss
libvirt-nss-7.0.0-1.module+el8.4.0+9464+3e71831a.x86_64

2. Edit the nsswitch.conf file to be with:
hosts:      files libvirt dns myhostname

3. start a vm connected to the default network:
# virsh net-dumpxml default
<network>
  <name>default</name>
  <uuid>5f596afb-cbbd-4cb9-baab-be585536d844</uuid>
  <forward mode='nat'>
    <nat>
      <port start='1024' end='65535'/>
    </nat>
  </forward>
  <bridge name='virbr0' stp='on' delay='0'/>
  <mac address='52:54:00:37:1c:18'/>
  <ip address='192.168.124.1' netmask='255.255.255.0'>
    <dhcp>
      <range start='192.168.124.2' end='192.168.124.254'/>
    </dhcp>
  </ip>
</network>

# virsh start test

4. login the guest and configure the hostname:
# hostnamectl set-hostname guest_test
 # hostname
guest_test
reboot the guest
# reboot

5. after the guest boot successfully, check on host for the guest's hostname by net-dhcp-leases, it can not get the hostname:
# virsh domifaddr test
 Name       MAC address          Protocol     Address
-------------------------------------------------------------------------------
 vnet6      52:54:00:f3:f5:ee    ipv4         192.168.124.17/24

# virsh net-dhcp-leases default
 Expiry Time           MAC address         Protocol   IP address           Hostname   Client ID or DUID
------------------------------------------------------------------------------------------------------------
 2021-01-21 05:49:18   52:54:00:f3:f5:ee   ipv4       192.168.124.17/24    -          01:52:54:00:f3:f5:ee

Actual results:
guest's hostname can not be resolved by the libvirt_nss module

Expected results:
there should be hostname showed in the net-dhcp-leases output

Additional info:
same issue exists on libvirt-6.10.0-1.module+el8.4.0+8898+a84e86e1.x86_64,
but it can not be reproduced on libvirt-6.6.0-12.module+el8.3.1+9458+e57b3fac.x86_64
Comment 1 smitterl 2021-04-16 08:37:28 UTC 
Reproduced with:
libvirt-nss-7.0.0-4.el9.s390x

I tested with 'libvirt_guest' module, ie. 

2'. Edit the nsswitch.conf file to be with:
hosts:      files libvirt_guest dns myhostname
Comment 2 smitterl 2021-04-16 09:14:10 UTC 
(In reply to smitterl from comment #1)
> Reproduced with:
> libvirt-nss-7.0.0-4.el9.s390x
> 
> I tested with 'libvirt_guest' module, ie. 
> 
> 2'. Edit the nsswitch.conf file to be with:
> hosts:      files libvirt_guest dns myhostname

Please, ignore the comment about 'libvirt_guest' module. I got confused.

I can reproduce all the steps using 'libvirt' module with the version libvirt-nss-7.0.0-4.el9.s390x.

This has been solved for RHEL AV 8.4, so expecting this to be fixed with next rebase for RHEL9, bz1918673

Notes:
With 7.0.0-4 ssh-login using libvirt_guest also seems to not be working, I suspect this is for the same reason.
Comment 3 Michal Privoznik 2021-04-16 11:24:09 UTC 
Sebastian, I'm not sure how this was fixed (I don't see any fix in git log since libvirt-6.6.0), but I'm glad to hear that it's working again. I've put more details into bug 1918673#2.
Comment 4 yalzhang@redhat.com 2021-04-19 08:07:57 UTC 
Same with bug 1918673#c3, it fails because of the improper hostname set on the vm. Close as "NOTABUG".
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