* [Qemu-devel] Re: trivial DNS issues [not found] <1220263041.28006.5.camel@localhost> @ 2008-09-01 10:29 ` Avi Kivity 2008-09-01 10:57 ` Cristi Magherusan 0 siblings, 1 reply; 6+ messages in thread From: Avi Kivity @ 2008-09-01 10:29 UTC (permalink / raw) To: cristi.magherusan; +Cc: qemu-devel, kvm (copying qemu-devel) Cristi Magherusan wrote: > Hello, > > It seems that qemu (and our kvm-qemu branch) and virtualbox suffer of > this issue regarding the DNS resolver: > http://www.virtualbox.org/ticket/421 > > I know it's mostly a DHCP client config problem, but we could try if the > designated DNS servers are reachable before we pass them to our virtual > machine, instead of blindly passing the first one. > What does your /etc/resolv.conf look like? -- error compiling committee.c: too many arguments to function ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Qemu-devel] Re: trivial DNS issues 2008-09-01 10:29 ` [Qemu-devel] Re: trivial DNS issues Avi Kivity @ 2008-09-01 10:57 ` Cristi Magherusan 2008-09-01 11:14 ` Avi Kivity 0 siblings, 1 reply; 6+ messages in thread From: Cristi Magherusan @ 2008-09-01 10:57 UTC (permalink / raw) To: Avi Kivity; +Cc: qemu-devel, kvm [-- Attachment #1: Type: text/plain, Size: 778 bytes --] Hello, On Mon, 2008-09-01 at 13:29 +0300, Avi Kivity wrote: > What does your /etc/resolv.conf look like? It used to look like this: nameserver 127.0.0.1 nameserver <PRIMARY_DNS_IP> nameserver <SECONDARY_DNS_IP> Inside the VM the DNS resolver was broken. After removing that line from the dhclient config now I have only my real DNS servers, and DNS works inside the VM. Those who have installed a local DNS server may need that stuff, but we can check every entries of resolv.conf and see if we can connect to their DNS server, and use in our VM the first one that could be reached. Thanks, Cristi -- Ing. Cristi Măgherușan, Universitatea Tehnică din Cluj-Napoca Centrul de Comunicații "Pusztai Kalman" Tel. 0264/401247 http://cc.utcluj.ro [-- Attachment #2: This is a digitally signed message part --] [-- Type: application/pgp-signature, Size: 197 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Qemu-devel] Re: trivial DNS issues 2008-09-01 10:57 ` Cristi Magherusan @ 2008-09-01 11:14 ` Avi Kivity 2008-09-01 12:31 ` Cristi Magherusan 0 siblings, 1 reply; 6+ messages in thread From: Avi Kivity @ 2008-09-01 11:14 UTC (permalink / raw) To: cristi.magherusan; +Cc: qemu-devel, kvm Cristi Magherusan wrote: > Those who have installed a local DNS server may need that stuff, but we > can check every entries of resolv.conf and see if we can connect to > their DNS server, and use in our VM the first one that could be reached. > > The network maybe down when the VM is started, or the dns server may be down, or ... Maybe we should forward the host's dns servers to the guest, replacing 127.0.0.1 by 10.0.2.2. -- error compiling committee.c: too many arguments to function ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Qemu-devel] Re: trivial DNS issues 2008-09-01 11:14 ` Avi Kivity @ 2008-09-01 12:31 ` Cristi Magherusan 2008-09-01 12:37 ` Avi Kivity 0 siblings, 1 reply; 6+ messages in thread From: Cristi Magherusan @ 2008-09-01 12:31 UTC (permalink / raw) To: Avi Kivity; +Cc: qemu-devel, kvm [-- Attachment #1: Type: text/plain, Size: 787 bytes --] On Mon, 2008-09-01 at 14:14 +0300, Avi Kivity wrote: > Cristi Magherusan wrote: > > Those who have installed a local DNS server may need that stuff, but we > > can check every entries of resolv.conf and see if we can connect to > > their DNS server, and use in our VM the first one that could be reached. > > > > > > The network maybe down when the VM is started, or the dns server may be > down, or ... > Maybe we should forward the host's dns servers to the guest, replacing > 127.0.0.1 by 10.0.2.2. Then we should forward them all, but the localhost one should be tested and skipped if unavailable. Cristi -- Ing. Cristi Măgherușan, Universitatea Tehnică din Cluj-Napoca Centrul de Comunicații "Pusztai Kalman" Tel. 0264/401247 http://cc.utcluj.ro [-- Attachment #2: This is a digitally signed message part --] [-- Type: application/pgp-signature, Size: 197 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Qemu-devel] Re: trivial DNS issues 2008-09-01 12:31 ` Cristi Magherusan @ 2008-09-01 12:37 ` Avi Kivity 2008-09-01 14:35 ` Cristi Magherusan 0 siblings, 1 reply; 6+ messages in thread From: Avi Kivity @ 2008-09-01 12:37 UTC (permalink / raw) To: cristi.magherusan; +Cc: qemu-devel, kvm Cristi Magherusan wrote: > On Mon, 2008-09-01 at 14:14 +0300, Avi Kivity wrote: > >> Cristi Magherusan wrote: >> >>> Those who have installed a local DNS server may need that stuff, but we >>> can check every entries of resolv.conf and see if we can connect to >>> their DNS server, and use in our VM the first one that could be reached. >>> >>> >>> >> The network maybe down when the VM is started, or the dns server may be >> down, or ... >> Maybe we should forward the host's dns servers to the guest, replacing >> 127.0.0.1 by 10.0.2.2. >> > Then we should forward them all, but the localhost one should be tested > and skipped if unavailable. > Why? A local application will have exactly the same problems with a broken dns server on localhost, as a virtual machine with that address forwarded. And if the the dns server is later fixed, both the local application and the guest will recover. -- error compiling committee.c: too many arguments to function ^ permalink raw reply [flat|nested] 6+ messages in thread
* [Qemu-devel] Re: trivial DNS issues 2008-09-01 12:37 ` Avi Kivity @ 2008-09-01 14:35 ` Cristi Magherusan 0 siblings, 0 replies; 6+ messages in thread From: Cristi Magherusan @ 2008-09-01 14:35 UTC (permalink / raw) To: Avi Kivity; +Cc: qemu-devel, kvm [-- Attachment #1: Type: text/plain, Size: 642 bytes --] On Mon, 2008-09-01 at 15:37 +0300, Avi Kivity wrote: > Why? A local application will have exactly the same problems with a > broken dns server on localhost, as a virtual machine with that address > forwarded. And if the the dns server is later fixed, both the local > application and the guest will recover. Okay, then maybe we should just pass them all to the VM and replace localhost's address, if present, with the internal gateway just like you said before. Cristi -- Ing. Cristi Măgherușan, Universitatea Tehnică din Cluj-Napoca Centrul de Comunicații "Pusztai Kalman" Tel. 0264/401247 http://cc.utcluj.ro [-- Attachment #2: This is a digitally signed message part --] [-- Type: application/pgp-signature, Size: 197 bytes --] ^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2008-09-01 14:35 UTC | newest]
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[not found] <1220263041.28006.5.camel@localhost>
2008-09-01 10:29 ` [Qemu-devel] Re: trivial DNS issues Avi Kivity
2008-09-01 10:57 ` Cristi Magherusan
2008-09-01 11:14 ` Avi Kivity
2008-09-01 12:31 ` Cristi Magherusan
2008-09-01 12:37 ` Avi Kivity
2008-09-01 14:35 ` Cristi Magherusan
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