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1608 discussions

Extract ip address from a kvm guest
by carlopmart 24 Apr '11

24 Apr '11

Hi all, Somebody knows how can I extract/know an ip address used by a kvm guest using a script?? For example I have the following guests: [root@kvmsrv01 bin]# virsh list --all Id Name State ---------------------------------- 1 linclunode01 running 2 linmgmt running 5 win7desktop running I know that linclunode01 has 172.25.50.1 as ip address, linmgmt has 172.25.50.2 and so on. But suppose that i don't know which ip address is used by win7desktop guest. The real fqdn for win7desktop is win7.local.net. How can I know its real ip using a script (bash, python, etc)?? I don't use a dhcp or dns server on this network. Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

5 7

KVM, virsh attach-disk problems
by Jussi Hirvi 24 Apr '11

24 Apr '11

Greetings, list! I hope you forgive cross-posting - I only now found this list. I am in the process of configuring a KVM stack of about 8 vms. Mostly I am concerned about performance, as there will be a lot of I/O. My last problem is this: I try to add a fresh, unformatted disk partition to a KVM guest. I follow the directions given here: http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/5/html-single/Vi… First I check that the module acpiphp is present on the guest. It is. On the host I write: virsh attach-disk test1 /dev/sdb1 sda --driver tap --mode shareable - test1 is my guest domain - /dev/sdb1 is the name of the unformatted partition on the host - sda is what it is supposed to be called on the guest (the name is unused on the guest) - the example in RHEL Virtualization guide says "--mode readonly". This does not sound right for a hard disk; hence I try "--mode shareable"; the error (see below) however is the same, whichever I use Now, the command above produces this error. I find no google results with this error text. Can someone tell, what causes the error? > > error: Failed to attach disk error: operation failed: adding scsi > > disk controller failed: type scsi not a hotpluggable PCI device. > > failed to add if=scsi I found a post (2009, on fedora-virt list), which is relevant: http://www.redhat.com/archives/fedora-virt/2009-December/msg00032.html Otherwise, I have found almost nothing! BTW, I can attach a disk to the KVM guest, using a virtio driver: > > [root@113 info]# virsh attach-disk test1 /dev/sdd1 vdb > > --driver virtio --mode shareable > Disk attached successfully I have not seen any mention anywhere about using virtio drivers like this. And the problem with this is that the new disk does not survive guest reboot. At guest startup virsh complains about the virtio drivers. - Jussi -- Jussi Hirvi * Green Spot Suvilahdenkatu 1 B 78 * 00500 Helsinki * Finland Tel. +358 9 493 981 * Mobile +358 40 771 2098 (only sms) jussi.hirvi(a)greenspot.fi * http://www.greenspot.fi

1 1

Confused by "qemu-img convert"
by MargoAndTodd 24 Apr '11

24 Apr '11

Hi All, Okay. Now I am confused. I have a bunch of virtual machines running under Virtual Box 3.2.12. I want to run them under KVM and drop Virtual Box from these systems. Supposedly "qemu-img convert" now supports direct conversion from vdi to whatever KVM uses. So I fired up the man page and got really confused. Then I fired up Google and got worse confused. Might I impose on some kind individual to write down a sample run string that would show me how to do this? Many thanks, -T

2 4

Cannot samba mount a remote windows disk
by Poh Yong Hwang 12 Apr '11

12 Apr '11

Hi, I would like to mount a remote windows disk as samba share drive but unable to do so on my host node. I tried it on my instances and it works so i am suspecting that perhaps firewall could be blocking it. Right now i see that the iptables for the host node with KVM installed : iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- anywhere anywhere udp dpt:domain ACCEPT tcp -- anywhere anywhere tcp dpt:domain ACCEPT udp -- anywhere anywhere udp dpt:bootps ACCEPT tcp -- anywhere anywhere tcp dpt:bootps Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable Chain OUTPUT (policy ACCEPT) target prot opt source destination Do i need to add anything to allow samba share to work? Thanks! yongsan

1 0

VMware Server 2 fails on 5.6
by Benjamin Franz 10 Apr '11

10 Apr '11

So others can avoid the lesson I learned this morning, VMware Server 2 stopped working after upgrading to 5.6 from a working 5.5 install (with the libc workaround for 5.4+ already in place). Some Google-Fu indicates the problem is linked to more supporting libraries being changed (zlib, libxml2, possibly others) in addition to the existing libc issue. I get a segmentation fault trying to launch VM Server 2 and have been unsuccessful so far in getting my install to work again. My own solution is I am rebuilding the physical hardware for KVM support and temporarily hosting the VMware VMs on a second machine I have still running 5.5 as I transition to KVM since it became apparent some time ago that VMware Server 2 is no longer a tenable platform. -- Benjamin Franz

2 1

Vlan trunk/QinQ connected to KVM guest
by Nataraj 04 Apr '11

04 Apr '11

I am running KVM guests under Redhat 6. I tried to setup a bridge device to an interface with a vlan trunk connected to a Juniper switch. On the KVM host, I am able to define vlans and access them via the vlan trunk. I was not able to access a vlan from the kvm guest connected to the bridged interface. I believe this would be what is commonly called QinQ or 802.1ad. Is this possible to do? I am using virtio drivers. If I can't do this, I guess I will end up with alot of bridged vlans. I tried doing this a while back under the vmware server and it did not work either. I think the reason that it did not work had something to do with arp resolution. I believe I read some where that it may be possible under ESXi. Thanks, Nataraj

3 4

Time lagging on DomU
by Dennis Jacobfeuerborn 17 Mar '11

17 Mar '11

Hi, on one of our systems I see that while the time on the Centos 5.4 Host is correct it lags behind on two of the 5.5 guests by almost 5 minutes but is correct for the third domU. From what I understand the clock of the system is controlled by the host and and guest cannot write to it (and because of that not change it). Does anyone now what the cause could be and how I can fix the time for the guests? Running kernel versions: Host (correct time): 2.6.18-164.15.1.el5xen guest 1 (correct time): 2.6.18-194.3.1.el5xen guest 2 (wrong time): 2.6.18-194.32.1.el5xen guest 3 (wrong time): 2.6.18-194.el5xen Regards, Dennis

2 1

Resizing EXT3 partition in guest instance CentOS5
by Poh Yong Hwang 14 Mar '11

14 Mar '11

Hi, I have two guest vm instance running CentOS 5 with ext3 partition. I will like to reduce 1 VM harddisk space and using the 'release' harddisk space to add onto my second VM. Basically I need to know how can I reduce and increase an ext3 partition in CentOS KVM. I did a search and basically i can do it by booting the VM using Knoppix and use Gparted to reduce and increase the diskspace. I am thinking of the following 1) Boot first VM using Knoppix 2) Reduce the ext3 partition disk size using Gparted 3) Shutdown the VM and resize the diskspace using Virtual Manager 4) Increae the diskspace of the second VM using Virtual Manager 5) Boot up second VM using Knoppix 6) Increase the ext3 partition disk size using Gparted 7) Reboot the second VM As this is the first time i am doing it, will these work? Anyone has experience resiziing their EXT3 partition in KVM environment before? Thanks! Regards yongsan

6 19

Next3 (eg ext3 snapshots support) on OpenNode / CentOS 5 / RHEL 5 howto and rpms
by Andres Toomsalu 10 Mar '11

10 Mar '11

We have created an next3 and patched e2fsprogs OpenNode / CentOS 5 / RHEL 5 rpms - installable from opennode-test yum repo. Provided next3 kernel module is currently built against RHEL5 OpenVZ kernel used in OpenNode - so installing this next3 rpm package on your CentOS 5 or RHEL 5 host will install also OpenVZ patched RHEL5 kernel and newer e2fsprogs package. Installation and usage instructions are provided by this howto document: http://opennode.activesys.org/documentation/howtos/next3-snapshots/ There is also simple next3 snapshotting automation script available for use with cron - usage and download link provided in howto document referenced above. Regards, -- ---------------------------------------------- Andres Toomsalu, andres(a)active.ee

1 0

Virtual Machine
by Mark Smith 09 Mar '11

09 Mar '11

Hi everyone, I am still struggling to install a Windows XP host within my virtual machine manager, i can't seem to do a http, ftp and nfs. Can someone explain a simpler way of installing i have read all the Redhat documentation but still struggling :-( Thanks Mark

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