0
votes
1answer
14 views

weird bridge issue in KVM

on Centos 6.5 i have a bridge network connected to eth4 and my virtual machine (Centos6.5) running on KVM is also connected to that interface(vnet0) bridge name bridge id STP ...
-2
votes
3answers
33 views

Linux CLI server with a virtual windows machine running? [closed]

I have a ubuntu CLI server and I am wondering if it's possible to install a windows machine on a CLI server? My hope is that I can take a pre-made VirutalBOX or VMware image and put it on my Ubuntu ...
4
votes
1answer
57 views

Should new Linux VMs under ESXi 5.5 mount their filesystems with discard option?

When creating new Linux virtual machines using recent (>= 2014) distributions in VMware ESXi 5.5, should they mount their filesystems with the discard option ? I make the assumption that the VM's ...
0
votes
1answer
71 views

Is it advisable to use virtual Linux server installed on i5 / 8GB / 500GB desktop class computer? [closed]

We have CentOS 4.3 P4 / 512MB /Linux server installed somewhere in 2006-7. This machine has three network interaces for leased line, broadband (backup) and LAN. We use Sendmail, Fetchmail, NAT, Squid, ...
-1
votes
1answer
37 views

KVM Server error

I have installed KVM server in Centos 6.4 and i have created gluster storage pool in that gluster storage pool i have installed some linux and window VM's i have assigned 1GB RAM and 20 GD virtual ...
-1
votes
2answers
145 views

Best type of virtualization when CPU has more threads than cores

I have a 4 cores/8 threads Intel Xeon processor. This is something I tried to particularly ask in SolusVM support, however I haven't got a good reply. I even don't know if they are right: they told me ...
1
vote
0answers
27 views

XenServer pool, unable to access certain networks from 2 servers in pool

I have Xenserver pool of of 3 xenservers, at version 6.1. After we got a serious DDOS attack on our network, all servers got rebooted (whole pool of 3 servers got restart and entered into maintenance ...
0
votes
3answers
82 views

How to find out the virtualization type of an linux VPS?

Having access to an VPS, i need to know which type of virtualization it is running from the terminal. How can i know if it is OpenVZ, Xen, KVM, etc?
3
votes
1answer
46 views

'conntrack' tracking private TCP sessions between VMs

We have a pair of VMs running as virtual routers and BGP/TCP peering between the two virtual routers (running over QEMU/KVM). The VMs each have a tap interface that is connected to a Linux bridge that ...
4
votes
6answers
356 views

When is it time to add more cores to your virtual server? [closed]

I have a Linux (RHEL 5.8) server with Java 7 and Tomcat 7. The performance is poor, and I am pretty sure it's the DB queries that are slow. We have 2 cores right now, and load average never exceeds ...
0
votes
1answer
74 views

Ping (DUP) with Linux bridges and tap devices

http://imgur.com/qPoy2QJ I have two Linux (Ubuntu 12.04) VM (running on KVM) that networked together using two Linux bridges as shown above. The network interfaces are Linux TAP devices. The problem ...
0
votes
1answer
40 views

Linux Containers (LXC) : lx-execute and networking

I have a question about LXC Containers. I have some containers, if I lxc-start them, they come up with networking fine, but I want to just be able to run commands against them using lxc-execute, ...
0
votes
1answer
93 views

Relationship between KVM Virtualization Host and Guest resource utilization

I have a KVM Virtualization host with 8 cores and 32GB of RAM. The machine is used to host VMs used in evaluating software, configurations, etc. Typically there are 2-4 VMs running simultaneously. The ...
1
vote
1answer
38 views

Under what circumstances could multiple VMs and mounted drives have corruption at the same time?

Today I had to fix 3 VMs with near identical file system errors all running Redhat 5 or 6. Basically the VMs had corrupted inodes and remounted / as a read-only file system, also corrupting several ...
4
votes
2answers
199 views

Does LXC container performance depends of host load?

I am wondering if LXC could offer a full isolated benchmarking environment. Let's say we have 2 identical machines, with the same fresh Linux and without network connection. First machine has a load ...
4
votes
1answer
144 views

Optimization XFS on Linux guest in Hyper-V (VHDX)

In our company we're using Hyper-V (Windows Server 2012) hypervisor and VM to organize our in-company services in our data-center. I am supposed to set up Ubuntu 12.04 LTS guest for our main database ...
2
votes
1answer
328 views

“kernel: Cannot read proc file system: 1 - Operation not permitted” — millions of such messages each minute in kern.log on OpenVZ VPS? [closed]

I'm seeing repeated never ending such messages in kern.log on my OpenVZ ubuntu 12.04 server. Mar 2 06:23:33 localhost kernel: Cannot read proc file system: 1 - Operation not permitted. Mar 2 ...
-2
votes
2answers
89 views

Generate ISO from installed system

As part of my infrastructure I have many Virtual Machines running different Linux distros, under Proxmox using OpenVz. My problem is that I need to export into a personalized installable ISOs some of ...
0
votes
1answer
42 views

How to automatically start virtual Networks using virsh?

Following this answers, configuring domains to autostart using virsh is easy; set aside they fail with following error message: error: Failed to start domain [name] error: internal error Network ...
-1
votes
1answer
103 views

vmware disk becomes read-only on linux guest

I have Linux CentOS as guest OS on VMWare Workstation, the host is Windows Home. The Disk becomes read-only, every-time i untar a huge file (which results in hundreds of small files) somewhere in the ...
0
votes
1answer
26 views

How can I run image by tag

$ sudo docker images REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE ubuntu 13.10 9f676bd305a4 9 days ago ...
0
votes
1answer
67 views

Access to Web-application inside Docker

Here are what I have: the physical computer (1) i have installed the virtual machine on this computer (virtual box, bridged networking, ubuntu server, ip=192.168.1.80) inside this virtual machine I ...
2
votes
3answers
253 views

Docker: How to partition a large server?

So I have a Dell XS23 Rack with 8 CPUs and 40G Ram with vmware esxi in my production environment. The way I'd partitioned it before was 2 API servers (quad core, 8gig ram) 2 DB servers same specs, ...
-1
votes
1answer
399 views

KVM-Host OS recommendation [closed]

I am about to migrate a server installation (one OS) to a newer hardware and wish to enable/use KVM. So the hardware is fixed (https://www.hetzner.de/hosting/produkte_rootserver/ex40) , now I got the ...
3
votes
1answer
155 views

Private network between two KVM VMs

I'm trying to connect two KVM hosts together with a transparent ethernet link. I'm using Proxmox VE as the host and have configured 2 KVM VEs with ethernet interfaces and joined them to a single ...
0
votes
1answer
320 views

how to connect multiple kvm/qemu VM guests in to a subnet [closed]

I want to setup a simple subnetwork of KVM/QEMU guest VMs living on a single host (Fedora 19) for testing purposes. The subnet would contain 3 servers: 1 Debian 6.x eth0 ip: 10.0.0.7 eth1 ...
2
votes
2answers
450 views

Error running xe sr-create

I'm trying to add a new SATA drive (SSD) as a local SR. XenServer may have seen the drive before, but I don't recall every doing anything with it. I'm attempting to run this command: xe sr-create ...
0
votes
3answers
144 views

Interface for accessing to guest OS via libvirt

Is there any possible (not necessary native) ways to get access (e.g., terminal usage is the main purpose for me) to guest OS with *nix using libvirt/LXC(not as libvirt module) capabilities? And I ...
0
votes
0answers
27 views

vzpid equivalent for LXC?

I've recently migrated my containers from OpenVZ to LXC as OpenVZ support was dropped from Debian Wheezy. I used a command called vzpid on the host machine that identified from which container the ...
2
votes
3answers
172 views

How to avoid downtime when resizing virtual machines

Many IaaS provider offer dynamic upgrade/downgrade of RAM and cores. Usually a Linux VM has to be rebooted to apply these changes. Sometimes, things like VMware tools or other guest services are ...
0
votes
1answer
95 views

OpenVZ: Custom settings on container startup / Choosing the right MySQL Server

What I have: Two servers running Wheezy/OpenVZ with One MySQL container on each host master/master replicated (mysql1/mysql2) Replicated DNS on each host (dns1/dns2) different web-containers on ...
1
vote
0answers
151 views

IPv6 Routing / Subnetting

Recently I have installed Citrix Xen Server 6.2 on a machine. My Provider (Hetzner) gave me the IPv6 Subnet 2a01:4f8:200:xxxx::/64. Followed an article in the providers wiki (1) i got it working and ...
0
votes
0answers
75 views

Proxmox “File Does Not Exist” Error

Something happened to my Proxmox server and now some VMs won't boot. When I try to boot one in particular, I get the message: proxmox:~# qm start 103 volume 'Backups:103/vm-103-disk-1.raw' ...
0
votes
1answer
260 views

Expose virtual machine (vagrant) to local Wifi

I've setup a local virtual machine (ubuntu 12.4) using Vagrant (www.vagrantup.com) and need to share its resources on my local wifi network. It is basically running a webserver which should be ...
0
votes
1answer
91 views

Failover server virtualization, what solution? [closed]

I currently have a web/mail server with mutiple virtual domains on it. I would like to run a failover server (all my dns are already on an failover ip), keep it in sync with the main server. Thus ...
0
votes
0answers
71 views

opensm reports - Invalid requested MGID. What does it mean?

I've been working on a virtualized SR-IOV infiniband interface under Xen. If I run the OpenSM daemon under Dom0 IPoIB appears to work in the passed through VF. However, opensm starts using a lot of ...
3
votes
1answer
373 views

How to get virtualized SR-IOV Infiniband interface UP?

I've spent several days on this now and I've managed to get SR-IOV working with the Mellanox Infiniband card using the latest firmware. The Virtual Functions appear in Dom0 as 06:00.1 Network ...
0
votes
2answers
64 views

How to import an XEN disk.raw VM into OracleVM

I have two virtual machines running on an OpenSuse 12.3 Linux with XEN. These VMs has disk.raw files with Linux running inside them. I'm trying to use Oracle VM and want to get the two XEN disk.raw ...
0
votes
1answer
711 views

Proxmox: VMs and different public IPs

I have a server which has two NICs and both are directly connected to internet. I have five different public IP addresses available for the VMs. The host machine (Proxmox) doesn't need to use any ...
0
votes
1answer
390 views

tap interfaces always disabled in linux bridge

I have a physical interface eth0, and I want to create two virtual interfaces and bridge them with eth0. For this purpose I do: #Create the virtual interfaces tunctl -t tap0 tunctl -t tap1 ifconfig ...
0
votes
1answer
615 views

VT enabled in BIOS but KVM failed to detect

I Have Dell OPTIPLEX 755 machine with VT enabled in BIOS but when i trying to check using KVM i am getting following error I am missing something? root@nova-controller:~# kvm-ok INFO: /dev/kvm does ...
5
votes
4answers
726 views

What are the performance implications of running VMs on a ZFS host?

I'm considering migrating from ext3 to ZFS for data storage on my Debian Linux host, using ZFS on Linux. One killer feature of ZFS that I really want is its data integrity guarantees. The ability to ...
0
votes
0answers
135 views

Hyper-V: Ubuntu guests running out of memory

We appear to have a problem with Ubuntu guests running out of memory. We have several on 12.04 (LTS) and one on 13.04 and seem to have the same problem. It takes around 30 days from restart to ...
6
votes
1answer
144 views

Installing vmware/xenserver on a linux operating system?

We're currently in the process of setting up a server here in a research environment. It would be ideal to use VMware ESXi, but (and I apologise if I get this completely wrong, I'm somewhat new to ...
1
vote
2answers
465 views

Install an Oracle DB in a linux VM

I am trying to set up an Oracle database server (at the moment just for testing purposes) in a virtual machine. The setup I'm using: VirtualBox Network adapter in NAT mode (redirecting ports ...
1
vote
2answers
87 views

Access virtual box on remote server

I have a remote server (ubuntu) with 1 public IP. I've installed headless VirtualBox and deployed machine. For now I can access it by VirtualBox's VRDE Server running on server, but what i need is ...
2
votes
1answer
119 views

Is it possible to limit/throttle page faults with LXC container virtualization?

It's possible to limit a container to 512MB of RAM and 4GB of swap. However, if that container uses memory frequently that has been swapped out wouldn't it dominate the the IO resources of the storage ...
3
votes
2answers
751 views

How to edit/add file in VMDK

I have a VMDK (with several partitions) file which I need to modify. It is not attached to any particular virtual machine. I've tried using vmware-mount (from the VDDK toolset) in on Ubuntu server ...
-1
votes
1answer
72 views

Seeking advice: To virtualize or not? [closed]

I am a newbie system admin and I'm going to be administering a server for our intranet. I come from a PHP/Ruby/Python developer background. This server will serve as the host for several "technology ...
1
vote
2answers
144 views

KVM CLI install for CentOS 6.3 defaults to Minimal Install

So I now I've installed KVM (and its associated tools and packages- libvirt, VMM etc.). On the GUI (i.e using the VMM), installation works as its supposed to. However, when I try to create a VM using ...