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2 participants
1612 discussions

RHEL 5.5 Xen fixes
by Pasi Kärkkäinen 15 May '10

15 May '10

Hello, RHEL 5.5 has been released, and it contains many Xen related fixes. Here's the most important of the them.. fixing a dom0 caching bug which could cause domU disk corruption when the domU disk was accessed from dom0 after the domU was shutdown. Most people noticed this bug when pygrub used wrong (cached) information. "pygrub uses cached and eventually outdated grub.conf, kernel and initrd": https://bugzilla.redhat.com/show_bug.cgi?id=466681 And some more: "Xen hypervisor doesn't mask xsave feature from the guest; Fedora 11 PV domU kernel crashes": https://bugzilla.redhat.com/show_bug.cgi?id=524719 "[RHEL-5 Xen]: F-11 Xen 64-bit domU cannot be started with > 2047MB of memory": https://bugzilla.redhat.com/show_bug.cgi?id=502826 " Boot hang when installing HVM DomU": https://bugzilla.redhat.com/show_bug.cgi?id=524052 "[RHEL5 Xen]: PV guest crash on poweroff": https://bugzilla.redhat.com/show_bug.cgi?id=540811 "[RHEL5 Xen]: Cpu frequency scaling is broken on Intel": https://bugzilla.redhat.com/show_bug.cgi?id=553324 RHEL 5.5 kernel changelog: http://rhn.redhat.com/errata/RHSA-2010-0178.html Work-in-progress (Not yet in 5.5): "Grub2 guest support for RHEL5 Xen pygrub": https://bugzilla.redhat.com/show_bug.cgi?id=577511 -- Pasi

6 10

Simulate Network Cable Disconnect
by Tait Clarridge 13 May '10

13 May '10

Hello All, I am having trouble simulating a network cable disconnect with KVM. I would like to test active backup bonding for a switch IOS upgrade in a production environment. Basically I have the VM running on a bridged network which is also tied into GNS3 simulating a small-scale version of the production environment. I have tried bringing down the vnetX interface and the actual virtual network itself (virbrX) with no luck. Has anyone had to do this before/maybe knows some tips? If more info is required about my setup, I can give it. Thanks! Tait

2 3

Maximum disks to allocate on kvm guests
by carlopmart 03 May '10

03 May '10

Hi all, Somebody knows how many virtio disks can be allocated for one kvm guest?? I am searching on redhat's docs about this without luck. Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

1 0

peth0 unavailable for virt-manager virt-install
by Ed Donahue 29 Apr '10

29 Apr '10

Command just times our for me virt-install --paravirt --vcpus=4 --name server1 --ram 4096 --file /opt/xen-images/hlcnwmmp01.img -x "ks=http://10.203.1.11/kickstart/ks-xen.cfg" --file-size 40 --location http://128.61.111.11/pub/centos/5.4/os/x86_64 -b peth0 Starting install... Retrieving file vmlinuz... | 1.9 MB 00:00 Retrieving file initrd.img... | 7.1 MB 00:01 POST operation failed: xend_post: error from xen daemon: (xend.err 'Device 0 (vi f) could not be connected. Hotplug scripts not working.') Domain installation may not have been successful. If it was, you can restart your domain by running 'virsh start server1'; otherwise, please restart your installation. virt-mamanger doesn't display any options for physical interface xen-3.0.3-94.el5 libvirt-0.6.3-20.1.el5_4 virt-manager-0.6.1-8.el5 xen-libs-3.0.3-94.el5 kernel 2.6.18-164.15.1.el5xen peth0 is there: eth0 Link encap:Ethernet HWaddr 00:21:9B:9B:A7:56 inet addr:10.202.3.66 Bcast:10.202.255.255 Mask:255.255.0.0 inet6 addr: fe80::221:9bff:fe9b:a756/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3452114 errors:0 dropped:0 overruns:0 frame:0 TX packets:1924908 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:4900895721 (4.5 GiB) TX bytes:227380539 (216.8 MiB) peth0 Link encap:Ethernet HWaddr FE:FF:FF:FF:FF:FF inet6 addr: fe80::fcff:ffff:feff:ffff/64 Scope:Link UP BROADCAST RUNNING NOARP MTU:1500 Metric:1 RX packets:4415207 errors:0 dropped:6356 overruns:0 frame:0 TX packets:2505255 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:6274073430 (5.8 GiB) TX bytes:277402952 (264.5 MiB) Interrupt:24 Memory:d6000000-d6012800

2 4

KVM: 'ÿ' character after starting a VM via virt-install
by gibbe gabba 29 Apr '10

29 Apr '10

I'm unable to start a virtual machine with KVM. I'm using Centos 5.4 I have installed all necessary rpms (to my knowledge), but as you can see from the output (below), the system does not boot the CD-ROM. It just sits there doing nothing: # virt-install --prompt Would you like to use KVM acceleration? (yes or no) yes What is the name of your virtual machine? test How much RAM should be allocated (in megabytes)? 1024 What would you like to use as the disk (file path)? /var/lib/libvirt/images/test.img How large would you like the disk (/var/lib/libvirt/images/test.img) to be (in gigabytes)? 20 What is the install CD-ROM/ISO or URL? /root/CentOS-5.4-i386-bin-1of6.iso Starting install... Creating storage file... | 20 GB 00:00 Creating domain... | 0 B 00:00 Connected to domain test Escape character is ^] ÿ the 'ÿ' character appears after a few seconds, then nothing... Any help is appreciated!

2 4

Using md0 as a virtio block device
by carlopmart 23 Apr '10

23 Apr '10

Hi all, can I use /dev/md0 (raid1 configured under centos kvm host) as a virtio block device under a Centos 5.4 kvm guest?? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

1 0

Jumbo frames with virtio net
by carlopmart 23 Apr '10

23 Apr '10

Hi all Is it possible to configure jumbo frames (mtu=9000) on a kvm guest using virtio drivers? Thanks. -- CL Martinez carlopmart {at} gmail {d0t} com

1 0

virt-manager connect to remote virtual server xen+ssh
by Ed Heron 22 Apr '10

22 Apr '10

I don't usually install a graphical environment on my servers, so I don't usually use virt-manager. However, I recently put CentOS 5 on my Dell Latitude D820. It has hardware virtualization support, 4G RAM and a 500G HD, so I can carry a virtualization lab around with me. I found the trick of getting a non-active xen VM to show up in virt-manager's list by using virsh edit <VM> and changing the amount of RAM, so that was cool. I'm trying to use virt-manager to manager my other xen based virtualization servers, but I'm unable to successfully connect to them. I am able to connect to the other servers with virsh --connect=xen+ssh://vsrv/, though, so I'm assuming it has something to do with virt-manager. I haven't, yet, found any debug mode, so I'm hoping someone on the list has some suggestions for me. Please, give me some hints as to where to go next in trouble shooting virt-manager connecting to a non-local xen server. Is there a debug mode that I'm missing? -------------------- Ed Heron

2 1

KVM: 'ÿ' character after starting a VM via virt-install
by gibbe gabba 20 Apr '10

20 Apr '10

1 0

Useless use of AllowOverride
by R P Herrold 14 Apr '10

14 Apr '10

On Wed, 14 Apr 2010, Luke Carrier wrote: > And you really think treating people like *that* is going to get anyone to > take you or the projects you contribute to seriously? Really? This would be Rightly or wrongly as to how we got to this point, this ranting back and forth is and remains off topic. Please take it elsewhere -- Russ herrold

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