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KVM: bridge configuration for static IP address
by rewing 11 Dec '09

11 Dec '09

I need to allocate public IP address to two guest os. I have only 2 network card Interface on server. say eth0 and eth1. I set eth1 a public IP address. so it should in # vi /etc/sysconfig/ifcfg-eth1 DEVICE=eth1 BOOTPROTO=static HWADDR=00:1a:4d:83:ad:00 BROADCAST=202.127.29.0 IPADDR=202.127.29.5 NETMASK=255.255.255.0 NETWORK=202.127.29.0 ONBOOT=yes TYPE=Ethernet Question 1: do I have to add GATEWAY=202.127.29.1 to above setting? now continue to set eth0,seems I would use it as bridge ,so ifcfg-eth0 would be: # vi ifcfg-eth0 DEVICE=eth0 HWADDR=00:1a:4d:83:ad:50 ONBOOT=yes BRIDGE=br0 There's no IP address in this ifcfg-eth0. so Question 2: do I need to add the rest 2 IP addresses in br0? or I should keep br0 with no IP address and set IP in guest OS directly? Could anybody tell me how to set br0 to let host os and 2 guest os all have their own dedicated IP address?

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About doing backups with kvm guests
by carlopmart 11 Dec '09

11 Dec '09

Hi all, I have two centos 5.4 servers that I use to run several windows kvm guests (10). All works ok (more or less) but I have a problem with backups. These windows guests are configured to use lvm partitions as a virtual disks. My problem is when I need to do guests backups. which is the best form to backup and restore these windows guests? Some examples? I see snapshot's lvm option, but I think that this option it is not valid for windows guests... probably I need to use dd?? But if i use dd, how can I restore lvm image onto another host with lvm partitions? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

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Re: [CentOS-virt] Bridge configuration on Xen 3.2+
by Christopher G. Stach II 10 Dec '09

10 Dec '09

----- "Yukio Yamaishi" <yukio.yamaishi(a)gmail.com> wrote: > Hi All, > > I'm using xen 3.0 on CentOS 5 with VLAN. > > #vconfig add eth0 100 > #/etc/xen/script/network-bridge start vifnum=1 netdev=eth0 > bridge=xenbr0.100 > > I know that after xen 3.2 the procedure of bridge configuration is > changed. > What is the correct command to set bridge interface to vlan? Add the VLAN interface to a bridge just for that VLAN traffic and then use that bridge for your guests. -- Christopher G. Stach II http://ldsys.net/~cgs/

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Bridge configuration on Xen 3.2+
by Yukio Yamaishi 10 Dec '09

10 Dec '09

Hi All, I'm using xen 3.0 on CentOS 5 with VLAN. #vconfig add eth0 100 #/etc/xen/script/network-bridge start vifnum=1 netdev=eth0 bridge=xenbr0.100 I know that after xen 3.2 the procedure of bridge configuration is changed. What is the correct command to set bridge interface to vlan? Yukio

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KVM network bridge setting on centOS
by rewing 08 Dec '09

08 Dec '09

I have a server that will be hosted in IDC. The Server have 2 network interface card. I would like to set one for host os itself. and the other network interface card as bridge for guest OS. Because I have 3 IP address that will allocate to host os and guest os. The host OS will be centos 5.4. I need ideas about how to set host OS's network. Could anybody post a workable network seting for me? because the Centos Wiki page seems out of date about this part. and also I googling a lot, but most instruction in the internet seems out of date too. B.R. Rewing

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KVM guest on a specific disk
by rewing 08 Dec '09

08 Dec '09

I'm deploying my KVM virtualization and I have this question. To get my guest os best performance I would like to install my OS from CD ROM while booting in a saperate disk, say /dev/sda4 then in host os I mount /dev/sda4 as /mnt/vm. So I can install a guest OS by virt-install with synax --import, right? I didn't give it a try yet so I'd like to know if other people have done it successfully. Will this let guest os best performance because it has its own disk rather than just a image file? and will it ocuppy the host running resources less? Rewing

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Re: [CentOS-virt] virt-install failed while install windows2003 guest
by rewing 08 Dec '09

08 Dec '09

Hi,All I've solve this problem by doing a chcon --reference=/var/lib/libvirt/images /vm this solve selinux block kvm from accessing disk image outside of /var/lib/libvirt/images Thanks 2009-12-09 rewing 发件人： centos-virt-request 发送时间： 2009-12-09 00:57:19 收件人： centos-virt 抄送：主题： CentOS-virt Digest, Vol 28, Issue 9 Send CentOS-virt mailing list submissions to centos-virt(a)centos.org To subscribe or unsubscribe via the World Wide Web, visit http://lists.centos.org/mailman/listinfo/centos-virt or, via email, send a message with subject or body 'help' to centos-virt-request(a)centos.org You can reach the person managing the list at centos-virt-owner(a)centos.org When replying, please edit your Subject line so it is more specific than "Re: Contents of CentOS-virt digest..." Today's Topics: 1. virt-install failed while install windows2003 guest (rewing) 2. Re: virt-install failed while install windows2003 guest (Markus Falb) 3. Re: virt-install failed while install windows2003 guest (Tait Clarridge) ---------------------------------------------------------------------- Message: 1 Date: Tue, 8 Dec 2009 16:58:56 +0800 From: "rewing" <rewing(a)howfortune.com> Subject: [CentOS-virt] virt-install failed while install windows2003 guest To: "centos-virt" <centos-virt(a)centos.org> Message-ID: <200912081658540620074(a)howfortune.com> Content-Type: text/plain; charset="us-ascii" Here's the procedure: # qemu-img -f qcow2 /vm/win2k3.img 8G # virt-install --connect qemu:///system -n win2k3 -r 512 --vcpus=1 -c /home/temp/win2003sp2ins.iso -f /vm/win2k3.img -s 4 --network=bridge:br0 --mac=00:ff:ff:ff:58:58 --noautoconsole --vnc --os-type=windows --os-variant=win2k3 --hvm --accelerate And I get error as below: Starting install... internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Domain installation may not have been successful. If it was, you can restart your domain by running 'virsh start win2k3'; otherwise, please restart your installation. ERROR internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Traceback (most recent call last): File "/usr/sbin/virt-install", line 861, in ? main() File "/usr/sbin/virt-install", line 759, in main start_time, guest.start_install) File "/usr/sbin/virt-install", line 814, in do_install dom = install_func(conscb, progresscb, wait=(not wait)) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install self.domain = self.conn.createLinux(install_xml, 0) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img any idea? 2009-12-08 rewing -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.centos.org/pipermail/centos-virt/attachments/20091208/55c24500… ------------------------------ Message: 2 Date: Tue, 8 Dec 2009 12:41:34 +0100 From: Markus Falb <markus.falb(a)fasel.at> Subject: Re: [CentOS-virt] virt-install failed while install windows2003 guest To: Discussion about the virtualization on CentOS <centos-virt(a)centos.org> Message-ID: <7FEF197D-7025-4E95-87DB-72AE50CEFA3E(a)fasel.at> Content-Type: text/plain; charset="us-ascii" On 8 Dec 2009, at 09:58, rewing wrote: > libvirtError: internal error unable to start guest: qemu: could not > open disk image /vm/win2k3.img Do you have selinux enabled ? As far as I know the location for images is restricted to /var/lib/libvirt/images by default. -- Markus -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.centos.org/pipermail/centos-virt/attachments/20091208/ac8640d6… ------------------------------ Message: 3 Date: Tue, 08 Dec 2009 09:11:02 -0500 From: Tait Clarridge <tait(a)clarridge.ca> Subject: Re: [CentOS-virt] virt-install failed while install windows2003 guest To: Discussion about the virtualization on CentOS <centos-virt(a)centos.org> Message-ID: <1260281462.2495.1.camel(a)taiterltp.int.interactivemedia.com> Content-Type: text/plain; charset="utf-8" On Tue, 2009-12-08 at 12:41 +0100, Markus Falb wrote: > > On 8 Dec 2009, at 09:58, rewing wrote: > > libvirtError: internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img > > > Do you have selinux enabled ? As far as I know the location for images > is restricted to /var/lib/libvirt/images by default. > > -- Or does the actual disk image exist at /vm/win2k3.img with r/w access to whoever is running the virt-install command? Does the /vm directory exist and does the user have permissions to access it? -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 198 bytes Desc: This is a digitally signed message part Url : http://lists.centos.org/pipermail/centos-virt/attachments/20091208/79487930… ------------------------------ _______________________________________________ CentOS-virt mailing list CentOS-virt(a)centos.org http://lists.centos.org/mailman/listinfo/centos-virt End of CentOS-virt Digest, Vol 28, Issue 9 ******************************************

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virt-install failed while install windows2003 guest
by rewing 08 Dec '09

08 Dec '09

Here's the procedure: # qemu-img -f qcow2 /vm/win2k3.img 8G # virt-install --connect qemu:///system -n win2k3 -r 512 --vcpus=1 -c /home/temp/win2003sp2ins.iso -f /vm/win2k3.img -s 4 --network=bridge:br0 --mac=00:ff:ff:ff:58:58 --noautoconsole --vnc --os-type=windows --os-variant=win2k3 --hvm --accelerate And I get error as below: Starting install... internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Domain installation may not have been successful. If it was, you can restart your domain by running 'virsh start win2k3'; otherwise, please restart your installation. ERROR internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img Traceback (most recent call last): File "/usr/sbin/virt-install", line 861, in ? main() File "/usr/sbin/virt-install", line 759, in main start_time, guest.start_install) File "/usr/sbin/virt-install", line 814, in do_install dom = install_func(conscb, progresscb, wait=(not wait)) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 541, in start_install return self._do_install(consolecb, meter, removeOld, wait) File "/usr/lib/python2.4/site-packages/virtinst/Guest.py", line 633, in _do_install self.domain = self.conn.createLinux(install_xml, 0) File "/usr/lib64/python2.4/site-packages/libvirt.py", line 974, in createLinux if ret is None:raise libvirtError('virDomainCreateLinux() failed', conn=self) libvirtError: internal error unable to start guest: qemu: could not open disk image /vm/win2k3.img any idea? 2009-12-08 rewing

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S3 (Suspend to Disk) with XEN
by Yukio Yamaishi 07 Dec '09

07 Dec '09

Hi All, I have a 5.4 box and testing xen 3.4 on kernel-xen-2.6.18-164.6.1.el5. As you know, there are no enough configuration to do "Suspend to Disk" of the .config of the kernel-xen-2.6.18-164.6.1.el5. # Power management options (ACPI, APM) # CONFIG_PM=y Then, I tied to get the kernel-2.6.18-164.6.1.el5.src.rpm, installed that. #pwd /usr/src/redhat/BUILD/kernel-2.6.18/linux-2.6.18.i686 #cp configs/kernel-2.6.18-i686-xen.config .config #make menuconfig Power management options (ACPI, APM) ---> ACPI (Advanced Configuration and Power Interface) Support ---> │ │ │ │ CPU Frequency scaling ---> │ │ There are no menu which likes "Legacy Power Management API". How can I add the options to enable the Supend to Disk? Yukio

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Re: [CentOS-virt] Slightly OT: FakeRaid or Software Raid
by Christopher G. Stach II 03 Dec '09

03 Dec '09

----- "Grant McWilliams" <grantmasterflash(a)gmail.com> wrote: > On Wed, Dec 2, 2009 at 9:48 PM, Christopher G. Stach II < > cgs(a)ldsys.net > wrote: > > ----- "Grant McWilliams" < grantmasterflash(a)gmail.com > wrote: > > > a RAID 10 (or 0+1) will never reach the write... performance of > > a RAID-5. > > (*cough* If you keep the number of disks constant or the amount of > usable space? "Things working" tends to trump CapEx, despite the > associated pain, so I will go with "amount of usable space.") > > No. > > -- > Christopher G. Stach II > > Nice quality reading. I like theories as much as the next person but > I'm wondering if the Toms Hardware guys are on crack or you disapprove > of their testing methods. > > http://www.tomshardware.com/reviews/external-raid-storage,1922-9.html They used a constant number of disks to compare two different hardware implementations, not to compare RAID 5 vs. RAID 10. They got the expected ~50% improvement from the extra stripe segment in RAID 5 with a serial access pattern. Unfortunately, that's neither real world use nor the typical way you would fulfill requirements. If you read ahead to the following pages, you have a nice comparison of random access patterns and RAID 10 coming out ahead (with one less stripe segment and a lot less risk): http://www.tomshardware.com/reviews/external-raid-storage,1922-11.html http://www.tomshardware.com/reviews/external-raid-storage,1922-12.html -- Christopher G. Stach II

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