12:33 a.m.
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Hi everyone,
maybe this is an old fart, but I cant get it to work.
I am running libvirt on a laptop, where a dnsmasq is already running
to delegate dns info for my local (not-public) network. My resolv.conf
(on the host) lists the system-dnsmasq as first server.
I had to set the listen-adress for the system-dnsmasq to 127.0.0.1 and
set bind-interfaces, to stop if from binding to all interfaces and
overriding the libvirtd-dnsmasq, which also has dhcp enabled.
Now, how can I tell the libvirtd-dnsmasq, to use the system-dnsmasq as
first nameserver?
I found lots of pages when searching for "libvirt dns", but all of
them only show the dhcp-part of the network's xml file:
http://wiki.libvirt.org/page/VirtualNetworking#DNS_.26_DHCP
<ip address="192.168.122.1"
netmask="255.255.255.0"> <dhcp> <range
start="192.168.122.100" end="192.168.122.254" /> <host
mac="00:16:3e:e2:ed" name="foo.example.com"
ip="192.168.122.10" />
</dhcp> </ip>
One possible workaround:
My system-dnsmasq reads /etc/hosts_whatever, and apparently the
libvirtd-dnsmasq reads var/lib/libvirt/dnsmasq/NETWORK_NAME.addnhosts.
I could copy my hosts_whatever in that place, but I had to configure
the libvirtd-dnsmasq what my local domains are.
Which brings me to the next question:
How to set the addn-hosts= for the libvirtd-dnsmasq in the xml file?
Regards,
Johannes
- --
A good sermon should be like a woman's skirt: short enough to arouse
interest but long enough to cover the essentials.
(Ronald Knox)
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2:44 p.m.
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On 06.04.14 07:33 Johannes Kastl wrote:
Which brings me to the next question: How to set the addn-hosts=
for the libvirtd-dnsmasq in the xml file?
*ping*
Maybe I asked the wrong question, and this is an RTFM. But I looked
some more and found: nil. Nada. Nothing.
If someone had a M that I could F R then I would be glad... ;-)
Regards,
Johannes
- --
`Dobby is a free house-elf and he can obey anyone he likes´
(Harry Potter and the Half-blood Prince, S. 394)
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6:08 a.m.
On 04/06/2014 08:33 AM, Johannes Kastl wrote:
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Hi everyone,
maybe this is an old fart, but I cant get it to work.
I am running libvirt on a laptop, where a dnsmasq is already running
to delegate dns info for my local (not-public) network. My resolv.conf
(on the host) lists the system-dnsmasq as first server.
I had to set the listen-adress for the system-dnsmasq to 127.0.0.1 and
set bind-interfaces, to stop if from binding to all interfaces and
overriding the libvirtd-dnsmasq, which also has dhcp enabled.
Now, how can I tell the libvirtd-dnsmasq, to use the system-dnsmasq as
first nameserver?
libvirtd's dnsmasq instances always forward requests that they can't
resolve themselves to the dns server listed in /etc/resolv.conf, so it
should already be doing what you want.
There was a bug in libvirt for quite awhile that caused
locally-unresolved requests for hostnames in the domain given by the
network's <domain name='xyzzy'/> element to be dropped rather than
forwarded. Is that possibly the cause of your problems?
Alternately, since 1.1.3 you can tell dnsmasq to forward to a specific
address rather than the one listed in /etc/resolv.conf with the
<forwarder> subelement of the <dns> element in the network definition, e.g.:
<dns>
<forwarder addr='1.2.3.4'/>
</dns>
This is documented here:
http://www.libvirt.org/formatnetwork.html#elementsAddress
There was a bug in libvirt for quite awhile that caused
locally-unresolved requests for hostnames in the domain given by the
network's <domain name='xyzzy'/> element to be dropped rather than
forwarded. Is that possibly the cause of your problems?
I found lots of pages when searching for "libvirt dns", but all of
them only show the dhcp-part of the network's xml file:
http://wiki.libvirt.org/page/VirtualNetworking#DNS_.26_DHCP
> <ip address="192.168.122.1" netmask="255.255.255.0">
<dhcp> <range
> start="192.168.122.100" end="192.168.122.254" /> <host
> mac="00:16:3e:e2:ed" name="foo.example.com"
ip="192.168.122.10" />
> </dhcp> </ip>
One possible workaround:
My system-dnsmasq reads /etc/hosts_whatever, and apparently the
libvirtd-dnsmasq reads var/lib/libvirt/dnsmasq/NETWORK_NAME.addnhosts.
I could copy my hosts_whatever in that place, but I had to configure
the libvirtd-dnsmasq what my local domains are.
Which brings me to the next question:
How to set the addn-hosts= for the libvirtd-dnsmasq in the xml file?
You do that with the <host> subelement of the <dns> element. An example
is at the same link as above.
Regards,
Johannes
- --
A good sermon should be like a woman's skirt: short enough to arouse
interest but long enough to cover the essentials.
(Ronald Knox)
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_______________________________________________
libvirt-users mailing list
libvirt-users(a)redhat.com
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12:12 p.m.
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On 10.04.2014 13:08 Laine Stump wrote:
On 04/06/2014 08:33 AM, Johannes Kastl wrote:
> There was a bug in libvirt for quite awhile that caused
> locally-unresolved requests for hostnames in the domain given by
> the network's <domain name='xyzzy'/> element to be dropped rather
> than forwarded. Is that possibly the cause of your problems?
Maybe...
> Alternately, since 1.1.3 you can tell dnsmasq to forward to a
> specific address rather than the one listed in /etc/resolv.conf
> with the <forwarder> subelement of the <dns> element in the
> network definition, e.g.:
> <dns> <forwarder addr='1.2.3.4'/> </dns>
Nice, seems to work.
> This is documented here:
> http://www.libvirt.org/formatnetwork.html#elementsAddress
I actually was on that page, but I must have missed that bit...
Which brings me to the next question: How to set the addn-hosts=
for the libvirtd-dnsmasq in the xml file?
> You do that with the <host> subelement of the <dns> element. An
> example is at the same link as above.
No, thats not it. I do not want to set single hosts, I want to tell
dnsmasq to read an additional hosts-file. In the normal dnsmasq.conf
this is done via addn-hosts=, and that appears in the conf-file for
the network called e.g. WHATEVER:
addn-hosts=/var/lib/libvirt/dnsmasq/WHATEVER.addnhosts
Regards,
Johannes
- --
'Are you Death?'
... IT'S THE SCYTHE, ISN'T IT? PEOPLE ALWAYS NOTICE THE SCYTHE.
(Terry Pratchett, The Fifth Elephant)
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9:13 a.m.
On 04/10/2014 08:12 PM, Johannes Kastl wrote:
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On 10.04.2014 13:08 Laine Stump wrote:
> On 04/06/2014 08:33 AM, Johannes Kastl wrote:
>> There was a bug in libvirt for quite awhile that caused
>> locally-unresolved requests for hostnames in the domain given by
>> the network's <domain name='xyzzy'/> element to be dropped
rather
>> than forwarded. Is that possibly the cause of your problems?
Maybe...
>> Alternately, since 1.1.3 you can tell dnsmasq to forward to a
>> specific address rather than the one listed in /etc/resolv.conf
>> with the <forwarder> subelement of the <dns> element in the
>> network definition, e.g.:
>> <dns> <forwarder addr='1.2.3.4'/> </dns>
Nice, seems to work.
>> This is documented here:
>> http://www.libvirt.org/formatnetwork.html#elementsAddress
I actually was on that page, but I must have missed that bit...
> Which brings me to the next question: How to set the addn-hosts=
> for the libvirtd-dnsmasq in the xml file?
>
>> You do that with the <host> subelement of the <dns> element. An
>> example is at the same link as above.
No, thats not it. I do not want to set single hosts, I want to tell
dnsmasq to read an additional hosts-file.
There is no provision for that. If you want additional hosts to be known
by the libvcirt instance of dnsmasq, you must enter them into the xml.
If we allowed pointing to an existing addn-hosts file written by the
user, we would be adding the format of dnsmasq's addn-hosts file to
libvirt's official API, which we don't want to do - we want to keep
libvirt's API as implementation-agnostic as possible (in case someone
implements a libvirt network driver that uses something other than
dnsmasq for DNS, for example).
In the normal dnsmasq.conf
this is done via addn-hosts=, and that appears in the conf-file for
the network called e.g. WHATEVER:
addn-hosts=/var/lib/libvirt/dnsmasq/WHATEVER.addnhosts
2:23 p.m.
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Hi Laine,
thanks for the answer.
On 13.04.14 16:13 Laine Stump wrote:
There is no provision for that. If you want additional hosts to be
known by the libvcirt instance of dnsmasq, you must enter them into
the xml.
I can set the addn-hosts in the .conf file in
/var/lib/libvirt/dnsmasq/<nameofthenetwork>.conf.
I was just not sure if this gets overwritten, each time I change a
setting in the network's xml (virsh net-edit ...).
If we allowed pointing to an existing addn-hosts file written by
the user, we would be adding the format of dnsmasq's addn-hosts
file to libvirt's official API, which we don't want to do - we want
to keep libvirt's API as implementation-agnostic as possible (in
case someone implements a libvirt network driver that uses
something other than dnsmasq for DNS, for example).
Sounds reasonable.
Regards,
Johannes
- --
Osama bin Laden might wish to destroy America, but America is too big
for him; he cannot do it. Bush may really do it.
(Richard M. Stallman)
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4:23 a.m.
On 04/13/2014 10:23 PM, Johannes Kastl wrote:
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Hi Laine,
thanks for the answer.
On 13.04.14 16:13 Laine Stump wrote:
> There is no provision for that. If you want additional hosts to be
> known by the libvcirt instance of dnsmasq, you must enter them into
> the xml.
I can set the addn-hosts in the .conf file in
/var/lib/libvirt/dnsmasq/<nameofthenetwork>.conf.
Yes, you can change that file, but:
1) the location and contents of that file are not a part of the official
libvirt API, and are subject to change at any time,
2) The file is only read by dnsmasq immediately after it has been
created, when dnsmasq first starts.
3) dnsmasq runs as user nobody, so it isn't even possible to force it to
reread that file by sending a SIGHUP.
So, changing the contents of the conf file does you no good (or at least
it *shouldn't* do you any good)
I was just not sure if this gets overwritten, each time I change a
setting in the network's xml (virsh net-edit ...).
It is rewritten from scratch based on the network's config each time you
re-start the network.
2:11 p.m.
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Hi Laine,
thanks for the fast answer.
On 14.04.14 11:23 Laine Stump wrote:
On 04/13/2014 10:23 PM, Johannes Kastl wrote:
[/var/lib/libvirt/dnsmasq/<nameofthenetwork>.conf]
> I was just not sure if this gets overwritten, each time I change
> a setting in the network's xml (virsh net-edit ...).
It is rewritten from scratch based on the network's config each
time you re-start the network.
I first wanted to write, how sub-optimal that is. How libvirt could at
least check, if the user made manual changes to that file. How this
feels like curtailing libvirt without the need to do so, as at the
moment no other tool apart from dnsmasq is used.
Then I contemplated a little, and had to change my opinon. Of course
things like that would be nice, but setting a forwarder in the xml
solves all/most of my problems, so I do not need to set the addn-hosts.
And, to state it clearly, thank all of you for libvirt. I love it. I
am so glad I discovered it, and also discovered that it runs that smooth.
Regards,
Johannes
P.S.: Sorry if this mail (or a similar mail) gets sent twice, sending
offline somehow triggered a bug in my SeaMonkey...
- --
I don't want to achieve immortality through my work. I want to achieve
immortality through not dying.
(Woody Allen)
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7 comments
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