All Questions
86 questions
0
votes
1
answer
422
views
Install Ubuntu 20 PV guest on a Debian 10 Xen
Struggling to find a guide to do this. I've understood that xen-tools supports installing Ubuntu guests on Debian so that should be a fast and easy way but can't find any examples.
Anybody knows a ...
- 51
0
votes
0
answers
261
views
How to run xen hypervisor on a computer that only supports UEFI?
I have tried updating the bios, disabling hyperthreading, adding xen.efi to its proper location within Ubuntu, building xen from source, etc. Yet I cannot get past the following error
a Xen panic ...
- 1
1
vote
1
answer
372
views
Xen Domain0 Has Network But DomainU does not
After re-installing my domain 0, a guest VM (domain U) is no longer able to connect to the network.
I am using Ubuntu 20.4 on my Domain 0 with Xen 4.11. I am able to successfully connect to internet ...
- 363
0
votes
0
answers
314
views
Why can't I boot xen hypervisor on Ubuntu 20.04.1? panic on cpu 0 timer doesn't work
As the subject says I simply cannot boot into the hypervisor. I'm able to install it just fine though, it says something about the CPU when I try to boot and quickly just reboots. I have ...
1
vote
1
answer
690
views
Resizing Ubuntu Server partitions in a Xen environment
I need to increase an Ubuntu partition, in a Xen environment.
Through XenCenter, I increased the disk, from 10GB to 100 GB.
Now I can see "xvda" size 100 GB.
For reasons I don't know, in ...
- 33
1
vote
0
answers
1k
views
Failed to connect socket to 'var/run/libvirt/virtxend-sock': file or directory not found
I want to boot a physical installation of windows 10,so I need to run xen HVM version. Do u have a tutorial that I can follow ?
I'm trying to create a new connection inside virt-manager,with xen,on ...
- 143
0
votes
0
answers
438
views
Xen guest (ubuntu) does not reboot with 'no bootable device.' after change of disk size
I just increased the size of a disk in a xen (server 6.2) guest (ubuntu 14.04). After the guest shutdown it did not boot up again with the error: 'no bootable device.'
Does anybody have an idea how ...
2
votes
2
answers
2k
views
NUMA placement failed, performance might be affected
I'm running SuperMicro 6048R-E1CR36H Storageserver on Ubuntu Xenial 16.04.03 LTS and Xen
Kernel: 4.4.0-97-generic
Xen: xen-hypervisor-4.6-amd64:amd64/xenial-security 4.6.5-0ubuntu1.2
Problem: when ...
- 339
0
votes
1
answer
2k
views
Xen Vm install error could not find bridge device xenbr0
I am using Xen on Ubuntu, and I want to install Ubuntu on Xen as a domU. I followed these instructions: https://help.ubuntu.com/community/Xen, Manually installing an HVM Guest VM
However I had this ...
- 9
0
votes
1
answer
154
views
unrecognized usb passthrough to windows server 2012 r2 on ubuntu 16.04
I have a ubuntu 16.04 lts on a intel NUC machine.
I want to use a TV usb tuner, in Japan, which only works for Windows.
So, I'm trying to install a windows server 2012 r2 guest VM on the ubuntu host....
- 3
0
votes
1
answer
5k
views
How to create bridged network interface for Xen?
I'm trying to use Xen on an Ubuntu server for the first time and have a really basic question.
I'm following the guide in the Ubuntu docs and under the Network Configuration->Using bridge-utils ...
- 479
1
vote
1
answer
426
views
Libvirt with Xen fails to start correctly Ubuntu 14.04
At the moment i'M really feeling a little helpless:
I tried to setup Ubuntu 14.04 with Xen and libvirt for management.
I created a VM but I did not auto-start (altough autostart is checked).
If I do ...
- 91
2
votes
0
answers
162
views
Start xend service automatically on boot fails
I am trying to auto-start xend and xendomain service automatically on boot as soon as I log into XEN-dom0 (on Ubuntu server 12.04 x64) so that whey i type : sudo xm list the hypervisor lists me all ...
- 133
1
vote
2
answers
448
views
Multi IPs on a Xen VM with bridging
While I am fairly new to XEN (running under Ubuntu 14.04) I've not had any real issues until now. I have set my networking using bridging and that has worked well for many different machines until ...
- 21
3
votes
4
answers
7k
views
Xen VM won't come up: could not find bridge device xenbr0 (configured to use routed)
I am using xen 4.4.1 on an Ubuntu 14.04 server, my DomU is running Ubuntu 14.04 Server as well. I've run this DomU in bridge-mode previously no problems. However I want to switch to a routed setup.
I ...
- 31
0
votes
0
answers
64
views
Difficulty sharing physical ethernet device with Xen 4.4
I have a virtualized PowerEdge T320, with a Ubuntu Server 14.04 running Xen 4.4 as host, that I use at my lab to do scientific computations (I'm the admin of the machine). This server has two physical ...
user255827
1
vote
1
answer
197
views
create parition for xen with lvm on raid-1
First I don't have any experience creating xen, lvm and RAID-1 server, thus after several reading I stumbled upon this ubuntu documentation to install xen.
BUT, because in the documentation it doesn'...
- 127
8
votes
1
answer
3k
views
xen:balloon: reserve_additional_memory: add_memory() failed: -17
We're running Ubuntu 14.04 on an EC2 virtual machine. I've been seeing a lot of these errors in our kernel log:
[ 704.032085] xen:balloon: reserve_additional_memory: add_memory() failed: -17
[ 736....
- 788
0
votes
2
answers
1k
views
PXE boot server on a xen PV guest?
I've set up a Xen hypervisor on ubuntu 14.04 and a PV guest also on ubuntu 14.04.
I want this PV guest to be a PXE boot server. But when I look at the /boot folder I see that it's empty.
I'm a newbie ...
- 167
5
votes
2
answers
8k
views
Ubuntu on VPS becomes unresponsive: BUG: soft lockup - CPU#0 stuck for 22s
We have a VPS running Ubuntu, on Xen. The problem is this, about once a day, for about 20-50 minutes, at a random time, the server becomes completely unresponsive to the outside world. After this ...
- 240
4
votes
1
answer
2k
views
Ubuntu 14.04 VPS won't boot the latest kernel on XEN
I have a XEN VPS and it's been running Ubuntu for some years now.
AUtomatic security upgrades are on and I've manually upgraded it continously and also done releas-upgrades whenever there's been a new ...
- 43
2
votes
1
answer
2k
views
Xen SATA PCI Passthrough to Ubutnu DomU not recognising disks
I have a Xen 4.1 server with a Debian Wheezy 7.4 Dom0 (hmpyxen01). It has a SATA PCI card that I am passing through to an Ubuntu Precise 12.04 DomU (hmvmtmp01), installed via xen-tools which in this ...
- 161
1
vote
1
answer
2k
views
Xen dom0 reports incorrect amount of RAM with dom0_mem set
I've done a fair bit of searching about this, but have found nothing that answers my question.
I have a system with 6GB of RAM which acts as a Xen server. For reference, it runs Ubuntu 12.04. I've ...
- 13
1
vote
2
answers
3k
views
Alternatives to bridging infiniband ipoib within xen domains?
I've installed xen-hypervisor-4.1 package onto an Ubuntu 12.04.3 server.
It has an infiniband adaptor installed and I run IPoIB with it.
What I'm wanting to do is provide the ipoib to one or more ...
- 14.8k
1
vote
2
answers
18k
views
IPv6: ADDRCONF(NETDEV_UP): eth2: link is not ready & IPv6: ADDRCONF(NETDEV_UP): xenbr2: link is not ready on Ubuntu Server - Xen bridge
Hi all,
I am having some problems getting a Xen bridge up in Ubuntu precise with Xen.
I created a first bridge on eth1 with no problems, but the exact same process for eth2 yields the following ...
- 455
2
votes
2
answers
1k
views
fix kernel on Xen Server hypervisor vps
I have a cloud server hosted at Rackspace, and they use Xen Server hypervisor. I was running Ubuntu 12.04, and really messed up by attempting to do a release upgrade manually.
The hypervisor ...
- 225
1
vote
1
answer
754
views
Booting Ubuntu 12.10 guest on Debian 6.0.4 Xen with pygrub
I'm trying to run a Ubuntu 12.10 off a Debian 6.0.4 and Xen-4.0. I realised that pygrub might not be able to parse the menu.lst (I symlinked menu.lst to grub.cfg in /boot) and ended up with this ...
- 330
1
vote
2
answers
1k
views
Strange Ubuntu boot up warning
I have a VM (Xen based), I can boot up the machine but there are some warning during the boot up.
Are they normal? If not, how to solved?
md: Scanned 0 and added 0 devices. ...
- 2,265
0
votes
1
answer
103
views
Xen domU sees 35MB less than assigned
I am using ubuntu precise 12.04 and I am booting a paravirtualized ubuntu 12.04 domU, all being 64 bits. The VM has memory=1024 assigned and xentop at the host correctly shows 1024MB, but htop in the ...
- 114
0
votes
1
answer
3k
views
Install Ubuntu Desktop from ISO on XEN
I've got XEN Hypervisor running on Debian as my base system. I understand VNC and conceptually installing PV based systems on my hypervisor but I'm getting stuck starting from scratch on a ISO-based ...
- 115
2
votes
1
answer
5k
views
How access a VM console in XCP?
I installed xcp-xapi package in Ubuntu 12.10. I have already created a PV VM in XenCenter, but I cannot access it's console -- when I choose the Console tab in XenCenter, I just got a blank page.
I ...
- 218
2
votes
1
answer
2k
views
xen Dom0 network setup on ubuntu 12.04.1 LTS
I read a lot of tutorials (or at least try to be) but none is able to explain well how to configure networks for xen host.
my Dom0 has two interfaces eth0 (real interfaces) and virbr0 (I guess was ...
- 178
4
votes
1
answer
3k
views
AppArmor - root: "You do not have enough privilege to read the profile set."
I'm trying to use AppArmor on a remote hosted Xen server with a custom built kernel.
AppArmor appears to be running, but not correctly. For example if I run the following command as root:
# aa-...
- 41
2
votes
2
answers
2k
views
Troubleshooting poor disk IO performance
Note that while this question is a little Redis-specific, the main problem is generic: a process takes so much HDD IO write bandwidth that other processes can't write anything.
We've got an Ubuntu VM ...
- 2,533
0
votes
3
answers
3k
views
Xen hypervisor 4.1 Kernel Panic on Ubuntu 12.04
I have a fresh Ubuntu 12.04.1 amd64 server install following this guide
I have used LVM option used all disk and make 2 LV
/dev/mapper/vg-root / (80GB)
vg-swap swap (4GB)
now i install xen with apt-...
- 178
1
vote
0
answers
177
views
XCP Project Kronos syslog error: "irq ... : nobody cared" on Dom0 host
One of our production clusters driven by XCP suddenly went uresponsive. After restart and some investigation we found such logs in dom0 machine syslog:
Oct 26 20:32:03 hetzner-2-mrx kernel: [1797931....
- 111
1
vote
1
answer
812
views
Virtualization on Atom D2700
Will paravirtualization work fine on Atom D2700 with 4 Gb RAM? Just several ubuntu/debian (maybe others) VM's with not heavy loads (LAMP for tests, torrent client, file server for PC and Mac etc.). ...
- 11
3
votes
2
answers
2k
views
Dedicated ip's for xen guests
I'm having a hell of an issue getting networking working in Xen on Ubuntu Server. Our server has a few public IPs (/29) that are all added through eth0 aliases. E.g.
eth0 - main ip
eth0:0 - first ...
- 31
3
votes
2
answers
3k
views
nf_conntrack complaints in dmesg
While investigating complains on bad HTTP server performance, I've discovered these lines in dmesg of my Xen XCP host that contains a guest OS with said server:
[11458852.811070] net_ratelimit: 321 ...
- 2,533
1
vote
0
answers
123
views
Ubuntu 10.04 Xen guest - why would time drift be proportionate with the system load?
We are trying to troubleshoot an issue with random system lockups during medium - heavy loads on an Ubuntu MySQL 5.1 server.
There is nothing logging into the system during these lockups. The only ...
- 19
1
vote
1
answer
2k
views
Ubuntu kernel trace - troubleshooting "task hung for 120 secs" random crashes
I was finally able to get a trace from a 'task hung for 120 seconds' error.
Our servers would just randomly crash on load spikes. IO wait times seem normal. Memory/Swap is fine.
These are Xen based ...
- 43
4
votes
1
answer
157
views
How does a VM hosted on xen knows that it is in a virtualized environment [closed]
I have read that in para virtualization hosted virtual machines are aware that they are being virtualized, and this allows them to increase their performance. But, how does the hosted machine know ...
- 143
3
votes
2
answers
4k
views
Can fragmented MySQL innodb tables cause I/O issues? "task hung for 120 seconds" crashes?
Large innodb databases with load spikes seem to be causing random crashes with "task hung for 120 seconds" in the console. There are no logs being written to the system during these crashes.
The ...
- 43
-1
votes
2
answers
6k
views
How to decide between Xen or KVM? [closed]
I am going to set up a high availability hosting server (load balancer, mysql, apache, php, memcached, apc, possibly a distributed/network file system of some kind) with two nodes. I want to isolate ...
1
vote
0
answers
127
views
XEN - (magic) networking issue
I have a very strange situation and do not know where to look. I have a XEN installed on Ubuntu 12.04 LTS. My hosting-provider does require, that every new IP my server uses has an own MAC-address. ...
- 43
2
votes
2
answers
498
views
Randomly crashing Ubuntu 10.04 on multiple Xen VPS host instances
So we have Ubuntu 10.04 running - all 64 bit.
Kernel 2.6.36 and 2.6.38-15 are having the same issues.
Problem is random VPS servers are hanging. We have about 30 instances with this particular host....
- 21
5
votes
3
answers
11k
views
Ubuntu 12.04 Netinstall URL? Xen Host
Well I have an Xen server, I've got a CentOS container up fine but a friend of mine wants (oh god) Ubuntu Server 12.04, why he can't use Debian is beyond my understanding. But anyways, I can't ...
- 81
0
votes
1
answer
732
views
Assigning Public IP on VM on XEN
Can anybody guide me in assigning public IP on VM running on Xen.
after xen installation virbr0 with ip 192.168.122.1 has been created. we are having 4 public ip,we need to assign that to each VM.How ...
- 535
1
vote
1
answer
4k
views
Managing XEN through virt-manager on ubuntu 12.04
I have been trying to make xen work on a remote machine with no GUI.Installed XEN hypervisor on the machine and booted in that kernel.Try to create VM using virt-manager. I tried accessing virt-...
- 1,520
1
vote
1
answer
1k
views
Cannot use I/O in console for Xen HVM running FreeBSD/pfSense
I've been having a really hard time trying to get a Xen HVM using pfSense 2 (based on FreeBSD 8.1) working.
I can make the machine run, and boot from an ISO image, but I cannot get I/O to work in the ...
- 111