1
vote
0answers
54 views

Weird Phusion+nginx spawning delay error

We are trying to migrate an application written on REE from cloud provider A to cloud provider B. The application code, VM specs and operating systems are the same. The basic difference is that cloud ...
2
votes
1answer
113 views

Poor network performance with KVM (virtio drivers) - Update: with vhost_net

I've set up several KVM based networks before, and never encountered this issue, can't for the life of me think what I'd have set up differently previously. Setup Basically, Ive got and entirely ...
1
vote
0answers
28 views

Virtuall Manager : CentOS Guest Install Garbled Text

I'm trying to install CentOS 6.5 with virtual manager but the menu is garbled. Host machine is running on Debian Wheezy. Thank you in advance.
1
vote
1answer
48 views

KVM: How to update amount of cores/procs during runtime

The title says it all. How do I increase the amount of cores/cpus of a vm without requiring a reboot. Strangely I did not find any documentation of how to do this...
0
votes
0answers
52 views

CentOS Host KVM Virtual Machine running a Windows VM - No internet access

I've installed a KVM virtual machine on a CentOS host using libvirt. I've also set up a bridged connection from the interface en0:4 running on IP x.x.x.15 to br0. (The IP is a public one). Running ...
0
votes
0answers
302 views

Gnome Boxes on CentOS 7 with Windows 7 as a guest

I just installed CentOS 7 and tried to use Gnome Boxes to create some virtual machines. As long as I stick to other Linux distributions everything is fine. But I really do have trouble installing ...
2
votes
1answer
144 views

Why has CD/DVD host passthrough been disabled in CentOS 7 \ RHEL 7?

I'm learning to use the KVM on CentOS 7 right now. For some reason Red Hat decided to disable the possibility of installing an OS on a virtual machine from a CD\DVD-Rom in RHEL 7. When creating a new ...
1
vote
0answers
53 views

Selenium in virtual machine is slower than desktop

I've set up a kvm virtual machine, CentOS 6 on both guest and host. I'm using selenium on the guest in order to test a web site. However, it loads significantly slower than trying to hit the web site ...
1
vote
1answer
54 views

CentOS 6.5 Server Lockup

Today one of our CentOS 6.5 KVM nodes from OVH crashed after 46 days of uptime and we were unable to find the reason why, we had this issue before with the OVH kernel on another server but this one is ...
0
votes
0answers
172 views

Apache bench failing with error “No route to host”

Got a new dedicated box. Installed CentOS 6.5 Installed KVM Installed a CentOS 6.5 guest rsync'd websites/database/settings etc over from existing VPS. Set up "dedi.mydomain.com" in DNS to test it ...
0
votes
1answer
150 views

Can't use yum on guest - suspect port 80 forwarding in iptables on host at fault?

What's wrong with this set-up? Both host and guest are CentOS 6.5 Specifically, I can't run yum on the guest. I can ping happily to/from the guest, including pinging mirrorlist.centos.org If I ...
0
votes
0answers
563 views

“Network error: connection refused” when trying to SSH to guest VM

CentOS 6.5 host, CentOS 6.5 guest. Using kvm. VM gets a local IP from the virbr0 interface. I've set up some port forwarding in iptables. port 80 forward works, but my SSH forward does not. ...
0
votes
2answers
145 views

How to give my KVM guests network connectivity? [closed]

I'm completely new to KVM and the whole idea of virtualisation, but have been reading about it for a couple of days and playing with it for the last few hours. Creating, installing, cloning etc... ...
0
votes
1answer
218 views

CentOS Virt-v2v conversion tool

I am trying to use the virt-v2v tool in CentOS for the conversion of virtual to virtual and eventually physical to virtual machines. I am rather confused after spending a day trying to get the ...
1
vote
1answer
166 views

bad page map bug during snapshot

I ran the following command to create a snapshot volume. But the kernel received a bug and the kvm hypervisor stopped responding. Why is the error and how to fix it? lvcreate -L20G -s -n ...
1
vote
1answer
87 views

SELinux policy issue

As qemu & KVM are working fine with SELinux out of the box I'd like to enable SELinux to improve guest isolation on my CentOS 6 server. The problem is that I'm using a 3rd parity virtualization ...
0
votes
0answers
119 views

Access KVM guest via hostname on private virtual network

KVM on CentOS 6.5. Setup one bridge connected to internet. And one virtual network on subnet 192.168.100.0/24 DHCP start: 192.168.100.128 DHCP end: 192.168.100.254 How to ...
2
votes
0answers
541 views

Very poor disk performance on KVM node - mdadm raid10

For a long period of time, i'm experiencing performance issues on CentOS servers that are used for KVM virtualization. I'm running software RAID-10 with 4 disks (Seagate ST2000DM001, 2TB, 7200rpm ...
1
vote
1answer
76 views

Does 'lvremove' destroy data?

I assign a LV for each vm guest. When deleting a vm, I remove the corresponding lv running 'lvremove'. But is it necessary to destroy the data before running 'lvremove'? Does lvremove do the work of ...
0
votes
1answer
127 views

assign public IPs to vm guests

I have a set of public IPs for virtual machines. Each unique public IP is to be assigned to a unique guest. With bridged networking I share eth0 with KVM machines. The ifcfg-eth0 file has ...
0
votes
1answer
81 views

Correct way to copy vm disk

I have a VM’s disk to copy from one host to another for live migration. I can think of two ways to copy the VM’s disk. Do a snapshot of the Logical Volume in the original host, create a Logical ...
1
vote
1answer
739 views

Assign ipv6 address to KVM guests on bridge mode

System: CentOS 6.5 Network: Bridge on br0 IPv6: ISP Native /64 block. IPv4: ISP address (not internal LAN) Purpose: To assign IPv6 only to guests (manually), I don't want ipv4 address to be ...
0
votes
2answers
39 views

Is there a way to set up a special user for kvm administration without adding to wheel group?

I'm trying to set up a user to manage kvm machines on a server, but I wanted to know if it would be possible to do without adding the user to the wheel group, as that effectively grants them ...
0
votes
2answers
324 views

KVM under CentOS, swap exhausted, physical memory available

I've had a test CentOS KVM host running for about a week now with 3 CentOS guests. There's 12GB physical RAM with about 7.5GB actually allocated to VMs. These VMs aren't even being used yet as the ...
0
votes
2answers
121 views

KVM XML config file

I have a KVM server that I expanded the LV of then rebooted. However now when booting I get the error: error: Failed to create domain from /home/kvm/kvmx/kvmx.xml error: (domain_definition):1: ...
0
votes
1answer
118 views

KVM permission denied on qcow2 disk over NFS

CentOS 6.3 running libvirt 0.10, trying to access/run a vm using a qcow2 on a Windows Server 2008 NFS mount. I tried nfsvers-3 when mounting but not luck, I get permission denied, presumably because ...
0
votes
2answers
200 views

Error KVM-based VM migration

Virtualization environment: KVM Source host: CentOS 5.9/64 Target host: CentOS 6.4/64 As proof of concept before migrating a production machine, I created a small VM & put a minimal Linux ...
0
votes
1answer
473 views

OpenStack Instance not using up full space

I have created new instance with Centos 6.4 with 20 GB Disk Space but when i logging to the VPS and Execute df -h the space shown as the following Filesystem Size Used Avail Use% Mounted ...
0
votes
1answer
102 views

libvirtd - Getting vps to use existing bridge

I've been working on getting KVM running on CentOS 6.4 and ran into a snag. After pouring through several online docs about setting up a bridge for the vps to connect to, and manually attempting to ...
0
votes
2answers
433 views

How to mount disk on centos 6.4 KVM server

I have Centos 6.4 on KVM server already up running with couple of sites, now i am almost run out with space so i decide buy from the server provider more gb in order to increase the HDD. I contact the ...
0
votes
1answer
201 views

kvm/qemu via libvirt on CentOS - pass string or key/value or file to guest

I have a sizeable deployment of qemu/KVM VMs already, managed through libvirt. They're all CentOS 5 or 6 hosts and guests (the kernel lacks the 9p filesystem flags, so the "mount" shared filesystem ...
2
votes
4answers
2k views

libvirt network error - no 'default' network device found

My original purpose is to create centos image for openstack. Although I did directly with kvm, still wondering about error. Was using this manual for my task. After this command: # virt-install ...
1
vote
1answer
134 views

kvm - Recover domain from .img file alone

Yesterday I had a drive failure (raid-0) in the host system and had to re-install the os. Fortunately the vps images were on another raid array (raid-5) and the .img files are still available. However ...
0
votes
3answers
1k views

KVM 802.1q (tagged VLAN setup)

I've done a lot of reading about VLAN tagging in KVM bridged networks, but am getting very confused as to what needs to be tagged (the physical network devices, or the bridges attached to those ...
1
vote
1answer
78 views

updating shadow file in a KVM guest in a mounted system

I have a KVM guest that I need to reset the password. If I use 'virsh console' to access the guest account, I'm able to update the shadow file with a new hash line like ...
0
votes
1answer
190 views

KVM Physical NIC access

I'm new to KVM. I have a host with 4 NICs. I want to set this up, is it possible? eth0+eth1= bond0 -> internal network build two guests each guest will have network access to 2 subnets ONLY eth2 -> ...
1
vote
2answers
767 views

Ovirt doesn't create live snapshot

I installed oVirt. If I suspent VM and create snapshot it's ok, but if I try to do live snapshot on the stage "Finalizing" ovirt have fail. Ovirt, VDSM and NFS storages are on the same local server. ...
0
votes
2answers
1k views

kvm: 23090: cpu0 unhandled wrmsr 0x391 data 2000000f

I installed kvm on CentOS 6.4. I created virtual server CentOS_test on it. When I start CEntOS_test I have message: kvm: 23090: cpu0 unhandled wrmsr 0x391 data 2000000f What is it mean? CentOS_test ...
0
votes
1answer
560 views

CentOS/KVM-libvirt: Public IP on VMs

I'm trying to set up a working vm with public ip adress, but I can't get it working. Here's my config : Network: range: 101.110.22.41 - 45 netmask: 255.255.255.248 gateway: ...
0
votes
1answer
458 views

KVM guest clock sync with host

I'm running KVM w/ centos 6.x. My guest vm clocks are booting with a 1-2 second lag from their host. My clocksource for the host is ntp. My clocksource for the guest is "kvm-clock", but I need to ...
2
votes
3answers
284 views

libvirtd: kvm: User Permissions Centos 6

I need to have user access control over how they can use the Virtual machines and what they can do via Virsh on a KVM based hypervisor. So far what I learned from http://wiki.libvirt.org is that I ...
1
vote
1answer
256 views

Connect KVM virtual network to internet

I have a CentOS server running KVM and need to connect a virtual network to the internet. The network must be routed or NATted, it must not be bridged (port security). If possible, I would like to ...
1
vote
2answers
1k views

Ganeti : Installing Centos/RHEL Instance

I have installed Ganeti on Centos 6.3 with DRBD and have added couple of nodes. However, now I am facing next challenge of installing a Centos Guest/Instance on top of it. I tried using ...
0
votes
0answers
50 views

enabling modules for a kernel

I have a KVM/XEN VPS and would like to enable the following modules: ipt_LOG ipt_multiport ipt_state ipt_limit ipt_recent ipt_owner iptable_nat tun/tap iptable_nat ipt_MASQUERADE ipt_POSTROUTING PPTP ...
3
votes
1answer
418 views

Assign public and private IP addresses for a KVM guest

I would like to create a KVM guest with two different IPs, like one public IP and another private IP for the same KVM guest. My host is 210.x.x.x. Series and Guest are also configured with the ...
13
votes
4answers
4k views

Improving IO with FlashCache

I have a server with 2 HDD's (2x 1 TB), running in RAID 1 (SW-RAID). I want to improve IO performance by using flashcache. There are running KVM virtual machines on it, using LVM. Regarding this, I ...
0
votes
1answer
516 views

How to setup KVM partitioning?

I'm trying to install SolusVM/KVM on a server with one 500 GB HD and one 256 SSD. I am a complete beginner at Linux. SolusVM has a script on the site to download and install automatically, but how do ...
0
votes
1answer
403 views

Bad network performance on KVM guest

I have a dedicated server connected to a 1000 Mbit port. However, the Debian guest is only getting half to a 1/4 the speeds: On the node itself (Linux node 2.6.32-279.9.1.el6.x86_64 #1 SMP Tue Sep 25 ...
0
votes
1answer
607 views

Windows 2008 running as KVM guest networking issue

I have a strange networking problem with Windows 2008 server R2, running as guest under KVM-Qemu host. Host is CentOS 6.3 x86_64. It's network settings: # cat /etc/sysconfig/network-scripts/ifcfg-br0 ...
1
vote
1answer
2k views

Centos/OVH: public IP on KVM virtual machine

Since a few days, I'm trying to configure my KVM vm to have a public IP address, without any success. First, I'm on OVH, and you need to know they don't allow networking from different mac addresses. ...