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• Can Xen be configured to dedicate only one port of a dual-port NIC to a domU?

  - by jamieb

  I'm using CentOS 5.4 on my dom0 with a stock Xen kernel. I'm attempting to use the pciback module to hide some of the Ethernet ports from the host and reserve them for a domU I intend to use for a firewall (process described here). However, when I launch the domU, I get the following error message: Using config file "/etc/xen/firewall". Error: pci: improper device assignment specified: pci: 0000:01:04.0 must be co-assigned to the same guest with 0000:01:06.0, but it is not owned by pciback. lspci gives me the following output: 00:00.0 Host bridge: Intel Corporation 82945G/GZ/P/PL Memory Controller Hub (rev 02) 00:02.0 VGA compatible controller: Intel Corporation 82945G/GZ Integrated Graphics Controller (rev 02) 00:1d.0 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #1 (rev 01) 00:1d.1 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #2 (rev 01) 00:1d.2 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #3 (rev 01) 00:1d.3 USB Controller: Intel Corporation 82801G (ICH7 Family) USB UHCI Controller #4 (rev 01) 00:1d.7 USB Controller: Intel Corporation 82801G (ICH7 Family) USB2 EHCI Controller (rev 01) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev e1) 00:1f.0 ISA bridge: Intel Corporation 82801GB/GR (ICH7 Family) LPC Interface Bridge (rev 01) 00:1f.2 IDE interface: Intel Corporation 82801GB/GR/GH (ICH7 Family) SATA IDE Controller (rev 01) 00:1f.3 SMBus: Intel Corporation 82801G (ICH7 Family) SMBus Controller (rev 01) 01:04.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) 01:06.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) 01:07.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8139/8139C/8139C+ (rev 10) From the sound of the error message, it seems like I also need to dedicate eth0 (PCI ID 01:04.0) to the domU. Am I correct? If not, what am I doing wrong? Thanks!

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• How to vertically split widescreen into two virtual workspaces on ubuntu/gnome?

  - by David

  My new laptop has a big 16:9 screen, and I'm finding it hard to fully utilize it during the 95% of the time that I'm not watching HD movies on it. I'd like to set it up as a kind of virtual dual screen by splitting the physical screen into two workspaces. I know I could arrange my windows manually, but I'd like to be able to maximize a window and have it only consume half the monitor, and have its pop up dialogs centered on its half-screen, that sort of thing. Is there some kind of plug in available to do this? Thanks in advance for any pointers.

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• URL redirect to a virtual server on a VLAN

  - by zeroFiG

  I have a production site, running off 10 servers. I've been given another virtual server on the same network as these 10 servers, to use for testing purposes. This server doesn't have it's own DNS entry. Therefore I need to do a redirect to the site hosted on this virtual server for a sub-domain of the site running on the 10 other servers. So Basically I was wondering how I would configure a sub domain of my production server to point at the Virtual server for testing. I'm guessing I need to modify my site file in /etc/apache2/sites-available and add another virtual host like the following and modify the redirect match: <VirtualHost *> ServerName SUBDOMAIN.DOMAIN.com RedirectMatch 301 (.*) **IP ADDRESS** CustomLog /var/log/apache2/SUBDOMAIN.DOMAIN.com.access.log combined </VirtualHost> Do I set the redirect match to just the IP on the Virtual server, and then configure another site file in the sites-available directory, which will recption this redirect and point the browser towards the HTML root? Thanks, I hope I made myself clear.

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• tap interfaces always disabled in linux bridge

  - by Dani Camps

  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 tap0 up ifconfig tap1 up #Create the bridge brctl addbr br0 brctl stp br0 off brctl addif br0 eth0 brctl addif br0 tap0 brctl addif br0 tap1 #Turning up the bridge ifconfig br0 up However my problem if that the tap interfaces always appear disabled in the bridge, and no traffic flows to them. $brctl show br0 bridge name bridge id STP enabled interfaces br0 8000.080027cabeba no eth2 tap0 tap1 $brctl showstp br0 br0 bridge id 8000.080027cabeba designated root 8000.080027cabeba root port 0 path cost 0 max age 20.00 bridge max age 20.00 hello time 2.00 bridge hello time 2.00 forward delay 15.00 bridge forward delay 15.00 ageing time 300.01 hello timer 0.00 tcn timer 0.00 topology change timer 0.00 gc timer 298.42 flags eth2 (1) port id 8001 state forwarding designated root 8000.080027cabeba path cost 4 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8001 forward delay timer 12.97 designated cost 0 hold timer 1.24 flags tap0 (2) port id 8002 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8002 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags tap1 (3) port id 8003 state disabled designated root 8000.080027cabeba path cost 100 designated bridge 8000.080027cabeba message age timer 0.00 designated port 8003 forward delay timer 0.00 designated cost 0 hold timer 0.00 flags Is there any way to set the tap interfaces in forwarding state? I do not understand why they are not because STP is disabled. Cheers Daniel

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• IP Forwarding and Routing in Windows 2008

  - by Danialzo

  I have Hyper-V running on a windows 2008. I got a new ip stack from the data center to be set on my virtual machines. But I have difficulties to set these IPs on my VMs because they are on different network. my current server ip is xxx.xxx.18.6 with MASK : 255.255.255.224 and the GW is xxx.xxx.18.1 my new ip stack is xxx.xxx.168.176/29 I can use RRAS to achieve this. Do I need to create another NIC? How do I make these VMs reachable from outside?

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• Mac OS X in Virtual Box - no 3D acceleration

  - by Andrew

  I installed Mac OS X on my pc in virtualbox, but 3D acceleration doesn't work!

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• Windows server 2008 r2 console stuck at "waiting for user profile service"

  - by support

  Hi, I have a windows 2008 R2 server, running on dell poweredge t300. Using hyper-v to run a windows 2008 R2 server also. Suddenly, today, my virtual console (on the virtual copy of windows 2008 server r2) will not let me login as administrator. It starts to login but then sticks at the message: Please wait for the User profile Service and is unresponsive to keypresses (incl ctrl-alt-del). The only way out is a crash. It starts up in safe mode without networking ok but not in safe mode with networking. Any suggestions on how to fix this would be appreciated Thanks

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• Windows RemoteApp deploying software updates, is there a better way?

  - by Ryan

  We provide an application as a service, over Windows RemoteApp. It's nearly impossible to deploy updates to the software, though, because if even a single user is online then the file is in-use and cannot be replaced. Is there some way to make this possible or easier? If it were possible, I'd be deploying probably 2-3 updates per day. As it is, I sometimes have to go all week without deploying one.

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• P4 vs. i3/i5 *T in power consumption and performance [migrated]

  - by Walter Zomb

  I am running an Intel P4 prescott with HT on my home server (linux file server on encrypted disks on software-RAID5 and virtualisation host for three further machines). The performance for this purpose is really okay. When the system is idle it consumes about 140W power. I am considering buying a new mainboard for an e.g. Intel i3-2100T or an Intel i5-2390T. Both are low power CPUs with a TDP about 40W. Has anyone experiences how much power a recent mainboard with one of these CPUs an 3-4 'green-energy' disks (6W each) consumes? Do I get underneath the 100W threshold? What's about the performance of these low power CPUs? Are they comparable to an Intel P4 with HT? regards, walter

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• Rainmeter customization issues, pretty basic

  - by user62865

  I'll admit it; I'm new to using Rainmeter. What I want to do is create two panels (one left, the other on the right) that mirror one another. One side I want to work for the Eastern US while the other for the UK. I want to keep digital clocks, the same style etc., on both sides with their respective time zone. On top of this I want to have weather reports for the whole day (Current weather and temp, morning, afternoon, and night) for each location. However, I have not been able to find any skins which allow this. For whatever reason every time I try to load a skin for a clock I can only load it for one clock of that type and I'm having the same issue with the weather skins. Could anyone please tell me what skins I should look at and how to get a mirrored look?

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• PC freezing when used to print labels

  - by Will

  Hi I have a windows XP machine that is used to print labels from a Zebra label printer. It is connected a member of the domain. I am getting reports that when people try to use the computer it will sometimes be frozen to the point where they have to physically shut the machine down and boot to get it responding. (this happens about once a day). I took a look in Event Viewer and nabbed some of these errors out of it: Event Type: Error Event Source: Userenv Event Category: None Event ID: 1054 Date: 11/12/2010 Time: 9:13:04 AM User: NT AUTHORITY\SYSTEM Computer: FS-LABELMACHINE Description: Windows cannot obtain the domain controller name for your computer network. (A socket operation was attempted to an unreachable host. ). Group Policy processing aborted. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Event Type: Error Event Source: AutoEnrollment Event Category: None Event ID: 15 Date: 11/11/2010 Time: 11:08:25 PM User: N/A Computer: FS-LABELMACHINE Description: Automatic certificate enrollment for local system failed to contact the active directory (0x80072751). A socket operation was attempted to an unreachable host. Enrollment will not be performed. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Hanging application MSACCESS.EXE, version 11.0.8166.0, hang module hungapp, version 0.0.0.0, hang address 0x00000000. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.... SearchIndexer (2420) Unable to write a shadowed header for file C:\Documents and Settings\All Users\Application Data\Microsoft\Search\Data\Applications\Windows\MSS.chk. Error -1032. For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. Failed auto update retrieval of third-party root list sequence number from: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt> with error: A connection with the server could not be established For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp. I'm not really sure what to make out of this... Thanks for the help in advanced, Will

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• OpenVZ Can't initialize containers after install

  - by Tonino Jankov

  I have installed OpenVZ on centos 6 on a dedicated server. I followed quick installation guide on openvz wiki. After installing thru yum, I don't know why, but grub.conf wasn't automatically updated to accomodate new kernel, so I had to do it manually. I edited grub.conf, added openvz kernel and rebooted - it went fine. Server went up into openvz kernel and it worked, it started openvz service byitself. But after I created a container, added IP to it and attempted to start it, I couldn't. Here is the output from the shell: [root@cloud2 ~]# vzctl start 86 Starting container ... Container is mounted Container start failed (try to check kernel messages, e.g. "dmesg | tail") Container is unmounted [root@cloud2 ~]# dmesg | tail [ 1973.401596] CT: 86: failed to start with err=-105 [ 2107.113850] Failed to initialize the ICMP6 control socket (err -105). [ 2107.155523] CT: 86: stopped [ 2107.155543] CT: 86: failed to start with err=-105 [ 6348.282184] Failed to initialize the ICMP6 control socket (err -105). [ 6348.330348] CT: 86: stopped [ 6348.330361] CT: 86: failed to start with err=-105 [45184.024002] Failed to initialize the ICMP6 control socket (err -105). [45184.072086] CT: 86: stopped [45184.072099] CT: 86: failed to start with err=-105 [root@cloud2 ~]# I don't know what is wrong. I tried different templates, debian 6, centos 6, i386, amd64, but the issue is the same. What is the problem?

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• SSH Public Key Authentication only works if active session exists before

  - by Webx10

  I have a rather strange problem with my SSH configuration. I set up my server with the help of a Remote Access Card and configured everything with a KVM viewer. So while being logged into the server via the KVM Viewer I configured SSH with only pubkey and tried to login from my local laptop. It worked fine. If I quit the KVM Session (or logout with the user in the KVM session) I cannot login via ssh anymore (pubkey denied). SSH login only works as long as the user is somewhere still logged in. Any hints what the problem might be? Console output for a failed login (all personal data exchanged): OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011 debug1: Reading configuration data /Users/mylocaluser/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: /etc/ssh_config line 103: Applying options for * debug1: Connecting to 100.100.100.100 [100.100.100.100] port 12345. debug1: Connection established. debug1: identity file /Users/mylocaluser/.ssh/id_rsa type 1 debug1: identity file /Users/mylocaluser/.ssh/id_rsa-cert type -1 debug1: identity file /Users/mylocaluser/.ssh/id_dsa type -1 debug1: identity file /Users/mylocaluser/.ssh/id_dsa-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.2 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH* debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr [email protected] none debug1: kex: client->server aes128-ctr [email protected] none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA ab:12:23:34:45:56:67:78:89:90:12:23:34:45:56:67 debug1: Host '[100.100.100.100]:12345' is known and matches the RSA host key. debug1: Found key in /Users/mylocaluser/.ssh/known_hosts:36 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/mylocaluser/.ssh/id_rsa debug1: Authentications that can continue: publickey debug1: Offering RSA public key: /Users/mylocaluser/.ssh/id_rsa2 debug1: Authentications that can continue: publickey debug1: Trying private key: /Users/mylocaluser/.ssh/id_dsa debug1: No more authentication methods to try. Permission denied (publickey). Console output for a successfull login (only possible while "active session" exists): OpenSSH_6.2p2, OSSLShim 0.9.8r 8 Dec 2011 debug1: Reading configuration data /Users/mylocaluser/.ssh/config debug1: Reading configuration data /etc/ssh_config debug1: /etc/ssh_config line 20: Applying options for * debug1: /etc/ssh_config line 103: Applying options for * debug1: Connecting to 100.100.100.100 [100.100.100.100] port 12345. debug1: Connection established. debug1: identity file /Users/mylocaluser/.ssh/id_rsa type 1 debug1: identity file /Users/mylocaluser/.ssh/id_rsa-cert type -1 debug1: identity file /Users/mylocaluser/.ssh/id_dsa type -1 debug1: identity file /Users/mylocaluser/.ssh/id_dsa-cert type -1 debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_6.2 debug1: Remote protocol version 2.0, remote software version OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2 pat OpenSSH* debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr [email protected] none debug1: kex: client->server aes128-ctr [email protected] none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Server host key: RSA ab:12:23:34:45:56:67:78:89:90:12:23:34:45:56:67 debug1: Host '[100.100.100.100]:12345' is known and matches the RSA host key. debug1: Found key in /Users/mylocaluser/.ssh/known_hosts:36 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: Roaming not allowed by server debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/mylocaluser/.ssh/id_rsa debug1: Server accepts key: pkalg ssh-rsa blen 279 debug1: Authentication succeeded (publickey). Authenticated to 100.100.100.100 ([100.100.100.100]:12345). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. debug1: Sending environment. debug1: Sending env LANG = de_DE.UTF-8 Welcome to Ubuntu 14.04.1 LTS

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• Explorer.exe keeps crashing if effects are enabled

  - by Allende

  The explorer.exe keeps crashing before every minute after starts when all the effects are activated. These are the details of the error: Problem signature: Problem Event Name: InPageError Error Status Code: c0000185 Faulting Media Type: 00000003 OS Version: 6.1.7600.2.0.0.256.48 Locale ID: 1033 Additional Information 1: a7aa Additional Information 2: a7aa91f17ea749d42a4de3b390fa5b3d Additional Information 3: a7aa Additional Information 4: a7aa91f17ea749d42a4de3b390fa5b3d Read our privacy statement online: http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409 If the online privacy statement is not available, please read our privacy statement offline: C:\Windows\system32\en-US\erofflps.txt I suspect there's a problem with my hard drive ('cause I already have to format/install twice before this error) but not pretty sure why if I disable all the effect (Performance options) help to stop the issue. Anyway if someone have any idea, thanks. I already replace shell32.dll and explorer.exe using the windows 7 dvd Laptop Model: ProBook 4520s Windows Version: Profesional 32 bits. My regards

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• Invisible boundary on Synergy client

  - by Jayson Rowe

  I have a Desktop system (named 'desktop') with 2 monitors attached (one 1680x1050 and another 1920x1080 resolution), running a synergy server. I also have a small ITX machine (named 'tiny') to my right that has a single monitor running at 1280x1024. The dual-monitor desktop is the synergy "server" and the single monitor system is the "client". Synergy works fine with one exception; if I move the mouse to the client, I can't move my mouse below the top two-thirds of the screen - it just stops. I can grab a mouse attached to the computer, and it moves all the way down, but as soon as I touch the mouse attached to the server, it jumps back to the top of the screen. Is there an issue with my config? section: screens desktop: tiny: end section: links desktop: right = tiny tiny: left = desktop end Thanks in advance for any suggestions. +----------------------------+-----------------------------+ | | | | | | | | +-----------------+ | | | | | desktop 1680x1050 | desktop 1920x1080 | | | | | | | | | tiny 1280x1024 | | | |+---------------+| | | |XXXXXXXXXXXXXXXXX| +----------------------------+-----------------------------+-----------------+

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• Citrix ICA Client on Mac shift key doesn't work as expected

  - by brianegge

  When I'm connected to a Windows XP computer from my Mac OS X 10.6 using the Citrix ICA Client, it seems that the shift key only works for the first letter typed after pressing shift. In order to type multiple uppercase letters, like ICA, I must either press caps lock, or press and release shift before each character. I've tried switching between standard and enhanced keyboard, as well as the 'Send Special Keys Unchanged' option, but none of these seem to affect the issue. The problem doesn't occur when I switch from the Citrix window to a regular Mac window.

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• problem with VNC

  - by Eva

  I upload vnc on my server and when i execute it : winvnc.exe -install i get this error : The vnc service could not be installed what am i going to do ?

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• Free tiered storage automation in linux?

  - by NginUS

  I have a couple virtualized fileservers running in QEMU/KVM on ProxmoxVE. The physical host has 4 storage tiers with significant performance variances. They're attached both locally and via NFS. These will be provided to the fileserver(s) as local disks, abstracted into pools, and handling multiple streams of data for the network. My aim is for this abstraction layer to intelligently pool the tiers. There's a similar post on the site here: Home-brew automatic tiered storage solutions with Linux? (Memory - SSD - HDD - remote storage) in which the accepted answer was a suggestion to abandon a linux solution for NexentaStor. I like the idea of running NexentaStor. It almost fits the bill. NexentaStor provides Hybrid Storage Pools, and I love the idea of checksumming. 16TB without incurring licensing fees is a huge plus as well. After the expense of the hardware, free is about all my budget can handle. I don't know if zfs pools are adaptive or dynamically allocated based on load, but it becomes irrelevant since NexentaStor doesn't support virtio network or block drivers, which is a must in my environment. Then I saw a commercial solution called SmartMove: http://www.enigmadata.com/smartmove.html And it looks like a step in the right direction, but I'm so broke I'd be wasting their time to even ask for a quote, so I'm looking for another option. I'm after a linux implementation that supports virtio drivers, and I'm at a loss as to which software is up to it.

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• How can I perform a controlled shutdown of a virtualbox guest using VBoxManage?

  - by Bryan

  I'm currently testing Ubuntu 10.04, and have install the VirtualBox software. I have also installed Ubuntu 10.04 as a VirtualBox guest running on the host system. I've installed the VirtualBox Utils into the guest OS, as follows: sudo apt-get install virtualbox-ose-guest-utils What I want to be able to do is to initiate a controlled shutdown of the guest, from the host system using the VBoxManage command. I first tried this command: VBoxManage controlvm guest poweroff which worked, but didn't initiate a controlled shutdown, it effectively pulls the plug on the guest. I've since found that this command should do the trick: VBoxManage controlvm guest acpipowerbutton but this doesn't appear to do anything. Can anyone tell me what I'm doing wrong? p.s. I don't want to use SSH & Certificates to do this, as I'm also going to be running Windows guests, and I want the solution to work for all guests.

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• What virtual machine software for fail-over and snapshots?

  - by consolibyte

  We're looking to virtualize a few machines with the hope that we can: a) Take "snapshots" of a machine to use as backups b) Implement a system where if the software/hardware fails, we can quickly and easily load up an recent snapshot on new hardware and replace the failed machine with a new one. As always, cost is a concern- there's only 3 or 4 servers we're going to do this with, so we don't want to drop $50,000 on this. I'm confused by all of the different virtual machine offerings. Which one is does what I want, and does it easily?

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• When I restart my LXC environment, the container does not re-bind to the IP address

  - by RoboTamer

  The IP does no longer respond to a remote ping With restart I mean: lxc-stop -n vm3 lxc-start -n vm3 -f /etc/lxc/vm3.conf -d -- /etc/network/interfaces auto lo iface lo inet loopback up route add -net 127.0.0.0 netmask 255.0.0.0 dev lo down route add -net 127.0.0.0 netmask 255.0.0.0 dev lo # device: eth0 auto eth0 iface eth0 inet manual auto br0 iface br0 inet static address 192.22.189.58 netmask 255.255.255.248 gateway 192.22.189.57 broadcast 192.22.189.63 bridge_ports eth0 bridge_fd 0 bridge_hello 2 bridge_maxage 12 bridge_stp off post-up ip route add 192.22.189.59 dev br0 post-up ip route add 192.22.189.60 dev br0 post-up ip route add 192.22.189.61 dev br0 post-up ip route add 192.22.189.62 dev br0 -- /etc/lxc/vm3.conf lxc.utsname = vm3 lxc.rootfs = /var/lib/lxc/vm3/rootfs lxc.tty = 4 #lxc.pts = 1024 # pseudo tty instance for strict isolation lxc.network.type = veth lxc.network.flags = up lxc.network.link = br0 lxc.network.name = eth0 lxc.network.mtu = 1500 #lxc.cgroup.cpuset.cpus = 0 # security parameter lxc.cgroup.devices.deny = a # Deny all access to devices lxc.cgroup.devices.allow = c 1:3 rwm # dev/null lxc.cgroup.devices.allow = c 1:5 rwm # dev/zero lxc.cgroup.devices.allow = c 5:1 rwm # dev/console lxc.cgroup.devices.allow = c 5:0 rwm # dev/tty lxc.cgroup.devices.allow = c 4:0 rwm # dev/tty0 lxc.cgroup.devices.allow = c 4:1 rwm # dev/tty1 lxc.cgroup.devices.allow = c 4:2 rwm # dev/tty2 lxc.cgroup.devices.allow = c 1:9 rwm # dev/urandon lxc.cgroup.devices.allow = c 1:8 rwm # dev/random lxc.cgroup.devices.allow = c 136:* rwm # dev/pts/* lxc.cgroup.devices.allow = c 5:2 rwm # dev/pts/ptmx lxc.cgroup.devices.allow = c 254:0 rwm # rtc # mounts point lxc.mount.entry=proc /var/lib/lxc/vm3/rootfs/proc proc nodev,noexec,nosuid 0 0 lxc.mount.entry=devpts /var/lib/lxc/vm3/rootfs/dev/pts devpts defaults 0 0 lxc.mount.entry=sysfs /var/lib/lxc/vm3/rootfs/sys sysfs defaults 0 0

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• Problems connecting Centos to the network when running in VMWare

  - by Sakin

  Hi, I installed CentOs on VMware running on windows XP. When trying to configure it to connect to the internet, I get an error message when trying to bring up the network interface: [root@VMLinux ~]# /et/init.d/network start Bringing up loopback interface: [ OK ] Bringing up interface eth0: Determining IP information for eth0... failed [FAILED] VM is running on a machine that has access to the network, I tried it on two different networks that have DHCP enabled. I tried to configure VMWare to use a bridged connection as well as NAT connection. An image of Ubuntu runs fine on the same VMware. What am I missing here? Thanks.

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• Why is Hard Disk Access Slow Through a Virtual Machine?

  - by Earl

  Why is throughput to an external hard drive from a virtual machine much slower than through the host? Access is generally 30MB/sec from the host and 4MB/sec frm the client. Is this normal?

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• Baseline / Benchmark Physical and virtual server performance

  - by EyeonTech

  I am setting up a new server and there are some options. I want to perform some benchmarks and I need your help in determining the best tools and if possible run pre-configured benchmarks designed for SQL servers on Windows Server 2008/2012. Step 1. Run a performance monitor on the current Live SQL server (Windows Server 2008 Virtual machine running on ESXi. New server Hardware rundown: Intel® Server System R1304BTLSHBN - 1U Rack, LGA1155 http://ark.intel.com/products/53559/Intel-Server-System-R1304BTLSHBN Intel Xeon E3-1270V2 2x Intel SSD 330 Series 240GB 2.5in SATA 6Gb/s 25nm 1x WD 2TB WD2002FAEX 2TB 64M SATA3 CAVIAR BLACK 4x 8GB 1333MHz DDR3 ECC CL9 DIMM There are several options for configurations and I want to benchmark some of them and share the results. Option 1. Configure 2x SSDs at RAID 0. Install Windows Server 2008 directly to the 2TB WD Caviar HDD. Store Database files on the RAID 0 Volume. Benchmark the OS direct on the hardware as an SQL Server. Store SQL Backup databases on the 2TB WD Caviar HDD. Option 2. Configure 2x SSDs at RAID 0. Install Windows Server 2012 directly to the 2TB WD Caviar HDD. Install Hyper-V. Install the SQL Server (Server 2008) as a virtual machine. Store the Virtual Hard Disks on the SSDs. Option 3. Configure 2x SSDs at RAID 0. Install VMWare ESXi on a partition of the 2TB WD Caviar HDD. Install the SQL Server (Server 2008) as a virtual machine. Store the Virtual Hard Disks on the SSDs. I have a few tools in mind from http://technet.microsoft.com/en-us/library/cc768530(v=bts.10).aspx. Any tools with pre-configured test would be fantastic. Specifically if there are pre-configured perfmon sets avaliable. Any opinions on the setup to gain the best results is welcome. Thanks in advance.

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• High I/O latency with software RAID, LUKS encrypted and LVM partitioned KVM setup

  - by aef

  I found out a performance problems with a Mumble server, which I described in a previous question are caused by an I/O latency problem of unknown origin. As I have no idea what is causing this and how to further debug it, I'm asking for your ideas on the topic. I'm running a Hetzner EX4S root server as KVM hypervisor. The server is running Debian Wheezy Beta 4 and KVM virtualisation is utilized through LibVirt. The server has two different 3TB hard drives as one of the hard drives was replaced after S.M.A.R.T. errors were reported. The first hard disk is a Seagate Barracuda XT ST33000651AS (512 bytes logical, 4096 bytes physical sector size), the other one a Seagate Barracuda 7200.14 (AF) ST3000DM001-9YN166 (512 bytes logical and physical sector size). There are two Linux software RAID1 devices. One for the unencrypted boot partition and one as container for the encrypted rest, using both hard drives. Inside the latter RAID device lies an AES encrypted LUKS container. Inside the LUKS container there is a LVM physical volume. The hypervisor's VFS is split on three logical volumes on the described LVM physical volume: one for /, one for /home and one for swap. Here is a diagram of the block device configuration stack: sda (Physical HDD) - md0 (RAID1) - md1 (RAID1) sdb (Physical HDD) - md0 (RAID1) - md1 (RAID1) md0 (Boot RAID) - ext4 (/boot) md1 (Data RAID) - LUKS container - LVM Physical volume - LVM volume hypervisor-root - LVM volume hypervisor-home - LVM volume hypervisor-swap - … (Virtual machine volumes) The guest systems (virtual machines) are mostly running Debian Wheezy Beta 4 too. We have one additional Ubuntu Precise instance. They get their block devices from the LVM physical volume, too. The volumes are accessed through Virtio drivers in native writethrough mode. The IO scheduler (elevator) on both the hypervisor and the guest system is set to deadline instead of the default cfs as that happened to be the most performant setup according to our bonnie++ test series. The I/O latency problem is experienced not only inside the guest systems but is also affecting services running on the hypervisor system itself. The setup seems complex, but I'm sure that not the basic structure causes the latency problems, as my previous server ran four years with almost the same basic setup, without any of the performance problems. On the old setup the following things were different: Debian Lenny was the OS for both hypervisor and almost all guests Xen software virtualisation (therefore no Virtio, also) no LibVirt management Different hard drives, each 1.5TB in size (one of them was a Seagate Barracuda 7200.11 ST31500341AS, the other one I can't tell anymore) We had no IPv6 connectivity Neither in the hypervisor nor in guests we had noticable I/O latency problems According the the datasheets, the current hard drives and the one of the old machine have an average latency of 4.12ms.

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