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• How many virtual processors or cores should I assign to my Guest OS?

  - by reidLinden

  I've just received an upgraded Host machine, and am looking to push some of those advances to my workstations Guest OS(s). In particular, I used to have a single processor, with 2 cores, so my Guest OS only had 1/1. Now, I've got a single processor with 8 cores, so I'm curious about what would be recommended for my Guest OS now? 1 processor/4 cores? 2 processors/2 cores? 4 processors/1 core? My instinct says to stick with the number of physical processors (or less), but, is that based on reality? I spent a good while looking for an answer to this, but perhaps my google-karma isn't in my favor today.

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• Odd Tools and Techniques for System Administrators

  - by Joseph Kern

  There's been a lot of questions centering on Software Tools for System Administrators. But I would like to know about any odd physical tools or techniques that you've used; Something that you never expected to be useful, but ended up saving the day. I'll go first: A Camera Phone. An application server had a major power issue that borked the RAID. Many of the disks were offline. Before I took the plunge and forced disks back online, I took a picture of the RAID BIOS screen with my camera phone. Having the exact layout of the RAID stored safely in my pocket, I was able to reset the RAID, and reboot the server. What odd tools/techniques have you used?

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• VirtualBox: Host OS processor is spiked while guest OS virtual processor is idle?

  - by Greg Mattes

  I'm running Windows XP 32-bit on Windows Vista 64-bit with VirtualBox 3.0.6. Whenever I run the XP VM, Vista (host) reports 100% cpu utilization even though XP (guest) reports between 1-5% cpu utilization. The host box has 2 GB of physical RAM. The guest/vm is configured with 512 MB. The host box has a 64-bit AMD processor. No apps (other than VirtualBox) are running on either host, they're just idling. Any guesses as to why the host processor is spiked? I've enabled various advanced features for the XP guest in the hopes of having better performance: Settings → System → Motherboard: Enable IO APIC Settings → System → Processor: Enable PAE/NX Settings → System → Acceleration: Enable VT-x/AMD-V and Enable Nesting Paging

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• Prevent Win7 boot loader from taking over the WinXP boot loader

  - by Chris

  My setup: 1 physical hard drive (500gb divided equally into 2 partitions) Windows XP Partition (Current OS) Empty Partition where I will be installing Windows 7 My question is how do I prevent the Windows7 boot loader from taking over my WindowsXP boot loader when installing the new OS ? The reason I am asking is because I already have a ghosted backup of my WinXP partition and if I ever need to restore my xp partition using that backup, would it not overwrite the Windows7 boot loader that was placed in the XP partition with the one from the backup, thus making windows 7 unable to boot. Also what would happen if I decided to delete the Windows XP partition altogether somewhere down the road and along with it the Win7 boot loader that was placed there, wouldn't that cause the system not to boot at all.. To avoid these issues, I simply want to make sure that BOTH the Win7 and WinXP boot loaders are available on their respective partitions and they do not interfere with each other in any way. Is this possible? Thx, Chris

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• Distributing entropy to virtual machines.

  - by Louis

  Dear All, I'm interested in generating secret keys for SSL on virtual machines using true randomness. By true randomness I mean the same level of entropy that can be generated by UNIX's dev/random and entropy gathering daemon (EGD). Is there a "general knowledge" recipe to route entropy from the physical layer to the virtual machines via the hypervisor regardless of the Hypervisor/Guest OS combination? Example: suppose one "hypervises" with VMware VSphere and instantiates Windows Guest OS. Can this hypervisor collect entropy from its peripherals (like dev/random/ would) and distribute it to these guest Windows OS? When considering the big vendors (VMware, Hyper-V, Citrix, etc), do they have entropy pools that gather entropy that can easily be pushed to their respective virtual machines? Louis

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• How should I isolate computers with different roles on a network

  - by fishhead

  I work in an industrial plant and we have one network(physical wire) that us used for both office usage and for process systems. The office computers are only used for typical office needs but occasionally do connect to the process computers to obtain information from a sql server or for some other purpose. A new initiative is in the works and is rolling down hill from corporate and that is to standardize how the the computers are used at work and they would be severely locked down and only a standard set of applications will be allowed to execute. one of the requirements is to also have non office computers isolated from the company domain. our non-office computers are a mix of Man-Machine interfaces and sql-servers all running software that non standard. My question is, how can we divorce the control systems computers from the company domain but still have access to the servers from the company domain. thanks

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• How should I isolate computers with different roles on a network

  - by fishhead

  I work in an industrial plant and we have one network(physical wire) that us used for both office usage and for process systems. The office computers are only used for typical office needs but occasionally do connect to the process computers to obtain information from a sql server or for some other purpose. A new initiative is in the works and is rolling down hill from corporate and that is to standardize how the the computers are used at work and they would be severely locked down and only a standard set of applications will be allowed to execute. one of the requirements is to also have non office computers isolated from the company domain. our non-office computers are a mix of Man-Machine interfaces and sql-servers all running software that non standard. My question is, how can we divorce the control systems computers from the company domain but still have access to the servers from the company domain. thanks

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• How do I upload huge files across the internet without using P2P?

  - by Brien Malone

  I work remotely and have 44GB of media files that I need to send back to my office. There are lots of free services out there that can handle up to 2GB, but I haven't seen talk of anything larger. We both have 50mbps+ connections, so I would rather not mail physical media (though, that is an option). Bittorrent is blocked at my corporate headquarters. We have an FTP server, but the per-user cap is 10GB. I use Citrix, but throughput is throttled to 3mbps. (44gb @ 50mbps = 4 to 5 hours... @3mbps = 5 or 6 days.) Any suggestions appreciated. Windows 7 and Windows 2003 Server are the OSes Involved I have tried JetBytes and it is blocked by our content filter

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• Xencenter guest will not boot

  - by Georgi

  I have xen server free edition. Today one of the guest VM was very loaded and I decided to reboot it. Now it can not start. It is with Ubuntu 10.04 Server. The machine is shown as running in xsconsole and in windows Xen control center. It shows 100 % CPU and 100 % RAM usage. The console shows nothing (it doesn't show boot process). And the worst is that I have no backup. Is there any advice how to see what is going on. I exported it to file and now I am trying it to import it into another server, because I can't reboot the physical server it runs on. Can this save me (the reboot of the server) Thank you

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• Flash player, HD videos and games are choppy

  - by Aimad Majdou

  I have a problem with flash player. HD videos from Youtube or Vimeo and flash games do not play smoothly. I'm using Flash player 11, Windows 7 Sp1, and my graphic card is Intel GMA 4500. Device Manager shows me that all drivers are installed on my computer, so i don't have any problems with drivers. When I run Google chrome, Resource Monitor shows me 15% ~ 40 % of CPU Usage and 40% used Physical Memory, but when I watch a video on Youtube or play a Flash game, the Resource Monitor shows 70% - 90% CPU Usage. Also, when I run some HD Video (Frame width : 1920, Frame height : 1080) on my computer, Device Manager shows me 80% ~ 100% of CPU Usage. before I Reinstall Windows 7, HD Videos and flash games were play smoothly I hadn't any problem with them !! I hope all these informations are enough to answer my question.

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• How do I choose which Ethernet Adapter to bridge in VMPlayer

  - by Catherine MacInnes

  I am running vmplayer 3.1.0 on Ubuntu. The host machine has four ethernet adapters that are configured to run on four different subnets. I need to run four VMs each with a single ethernet adapter bridged onto a specific one of the physical ethernet adapters. Does anyone know how to do this? Am I simply exceeding the capabilities of vmplayer and have to go to one of the other vmware products, if so, which one. Note that I have no need to create additional VMs, these are VMs that are being given to me by companies that want us to develop software for their products.

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• Windows screen shots via command-line SSH session

  - by Geoff Fritz

  I've browsed the handful of "screen capture" queries here, but I was unable to find anything which addressed my specific need. I'm looking for a command-line tool that I can run via remote SSH connection (by way of the cygwin sshd daemon). There are several to choose from, but the few I've tried (ImageMagick, nircmd, and MiniCap) all result in a blank screen. I assume that this is due to the remotely logged in user not having a proper graphical console session running. The goal here is automate screen capture and retrieval of the main system console (what one would see if they were looking at the physical monitor) through the use of ssh script from a Unix host: ssh user@windowshost "screencap --output /tmp/console.jpg" scp user@windowshost:/tmp/console.jpg /some/destdir Note that these must be done on demand, so polling a remote directory that has snapshots dumped periodically will not work. Bonus points for programs that are open source and have a portable install (so I don't need to RDP/VNC into the machine to run a graphical installer).

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• One bigger Virtual Machine distributed across many OpenStack nodes [duplicate]

  - by flyer

  This question already has an answer here: Can a virtualized machine have the CPU and RAM resources of multiple underlying physical machines? 2 answers I just setup virtual machines on one hardware with Vagrant. I want to use a Puppet to configure them and next try to setup OpenStack. I am not sure If I am understanding how this should look at the end. Is it possible to have below architecture with OpenStack after all where I will run one Virtual Machine with Linux? ------------------------------- | VM with OS | ------------------------------- | NOVA | NOVA | NOVA | ------------------------------- | OpenStack | ------------------------------- | Node | Node | Node | ------------------------------- More details: In my environment Nodes are just virtual machines, but my question concerns separate Hardware nodes. If we imagine this Nodes(Novas) are placed on a separate machines (e.g. every has 4 cores) can I run one Virtual Machine across many OpenStack Nodes? Is it possible to aggregate the computation power of OpenStack in one virtual distributed operating system?

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• Automating and deploying new linux servers

  - by luckytaxi

  I'm in the process of developing a method to automate new virtual machines into my environment. 90% of our machines are virtual but the process is similar for both physical and vmware based images. What I do now is I use cobbler to install the base OS. The kickstart script has post hooks to modify the yum repo and installs puppet and func. Once the servers are running, I manually add them into nagios and sign the certificate via the puppetmaster. I've since migrated most of the resources to use mysql as the backend. I wanted to see what others are doing and my goal for 2011 is to have puppet inventory the hardware into mysql, and somehow i'll script a python script to have nagios grab the info and automatically add it for monitoring purposes. It's kind of tedious to have to add each new server into nagios, puppet's dashboard, munin, etc...

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• Windows 7 - Move location of Eventlog

  - by Jörg B.

  I am having a particular nasty problem of my main system drive 'disappearing' all of the sudden while the system is running. The vendor somewhat knows about this but has not managed to fix it completely over multiple fw iterations. Problems I have with the support is that I cannot provide any particular system log files/entries to further analyse what might have been going on because, well - windows cannot write to its 'lost' drive before bsod'ing. Is there any way to configure where Windows 7 stores its event logs so that I could specify a second physical hdd?

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• How to get Mac OS X Terminal.app and screen/vim scrolling to play nice?

  - by rustychains

  OSX 10.6.3 Terminal.app Am a pretty dedicated screen user. Terminal.app line buffer and/or scroll does not seem to work for me. That is while in screen anything that goes past the top of the frame is gone, can't scroll back to. This seems to work ok in other terminal apps gnome, cygwin. Perhaps this is a shell env, config, or command? .screenrc: startup_message off autodetach on shell -$SHELL vbell off defutf8 on caption always caption string "%{= wk}%w" I have tried using defscrollback here with different values, but doesn't have an effect. some .bashrc settings: set -o physical export TERM=xterm-color shopt -s checkwinsize

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• How to clear stuck locked maildrop pop3 process

  - by Joshua

  I am using cyrus for imap and pop One of my users is getting the following error: Unable to lock maildrop : Mailbox is locked by POP server. I can see where it starts in the log. I've read that there is no physical lock file anymore (i've tried looking for it anyways) and that the solution is to just wait for the timeout, or kill the offending pop3 process. I know that this is happening because of a lossy connection on the part of the affected user, and that pop3 can only have 1 session active at a time. I need to manually clear the lock and I am having trouble finding the offending pop process. I have tried lsof, but it doesn't say how long the individual files (sockets) have been opened for. I've reduced the tcp keepalive time down to 5 mins, but I still need to reset this guy's lock. I could use some pointers. Thanks!

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• Cork Board Solution to tack things up on top or to the side of a monitor

  - by Bela

  I'm trying to find some sort of physical product that would either go on the top or the side of an lcd monitor and give me space to tape/push-pin/post it note things for myself. In my head I am picturing an extra space above your monitor 6 inches tall that lets you tape/push pin things up in front of you. For random notes and things I want to keep track of, having them on the top/side of my monitor would keep the space on my desk itself clear, and they would be closer to my field of vision. Does something like this exist? Do I need to rig up something myself? EDIT This is the closest thing I can find so far http://www.unplggd.com/unplggd/diy-project/reverse-engineer-how-to-feel-up-your-monitor-048251

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• USB to USB CD ROM emulator

  - by JohnnyLambada

  I'm wondering if anyone knows of a CDROM emulator that runs on Linux. I want to emulate this configuration: [CDROM DRIVE]----USB CABLE----[COMPUTER UNDER TEST] Where [COMPUTER UNDER TEST] is a computer that boots from a physical CD inserted into the [CDROM DRIVE]. Only instead of the [CDROM DRIVE] I want the following configuration: [CD IMAGE BUILD MACHINE]-----USB CABLE-----[COMPUTER UNDER TEST]. I want to build an ISO image on the [CD IMAGE BUILD MACHINE] and have some sort of USB CDROM emulator running on it to serve up the ISO image to the [COMPUTER UNDER TEST] as though it was talking to the [CDROM DRIVE]. Does this exist? If it does, I can't find it. I want to do this so I can test out bootable CDs without burning a lot of coasters.

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• Help creating image from LVM

  - by jackhab

  I need to duplicate CentOS hard drive image for multiple stations. The HD has the following layout: Disk /dev/sdb: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 250GB 250GB primary lvm I saved /dev/sdb1 to file with fsarchiver but for sdb2 I get: /fsarchiver savefs an2.fsa /dev/sdb2 oper_save.c#1006,filesystem_mount_partition(): can't detect and mount filesystem of partition [/dev/sdb2], cannot continue. removed an2.fsa Although fsarchiver probe simple correctly detects sdb2 as LVM2_member. Is fsarchiver correct tool for this job? What's wrong? I'm on Ubuntu 9.1 with fsarchiver 0.6.8 and lvm tools installed. Thanks.

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• Help creating image from LVM

  - by jackhab

  I need to duplicate CentOS hard drive image for multiple stations. The HD has the following layout: Disk /dev/sdb: 250GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 32.3kB 107MB 107MB primary ext3 boot 2 107MB 250GB 250GB primary lvm I saved /dev/sdb1 to file with fsarchiver but for sdb2 I get: /fsarchiver savefs an2.fsa /dev/sdb2 oper_save.c#1006,filesystem_mount_partition(): can't detect and mount filesystem of partition [/dev/sdb2], cannot continue. removed an2.fsa Although fsarchiver probe simple correctly detects sdb2 as LVM2_member. Is fsarchiver correct tool for this job? What's wrong? I'm on Ubuntu 9.1 with fsarchiver 0.6.8 and lvm tools installed. Thanks.

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• iDRAC on Dell R710 and R720

  - by BT643

  I've called Dell twice to try and clarify this basic (or so I thought) question, but I've had two different answers so far. We have a Dell R710, and a Dell R720. Does DRAC come installed by default on either? Dell said it comes build into the motherboard on the R720 but the second time I rang, they said we didn't have it. Can anyone tell me if DRAC comes as standard on the R720? I'm aware we'll need a license as well, I'm just interested in the physical capability on the server. I've never used DRAC before and know next to nothing about it, so apologies if this seems blindingly simple. Thanks

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• Any way to know if two ip address points to the same machine?

  - by Vivek V K

  Is there anyway to find if two different IP address in two different network actually points to the same physical device? I need it in Linux. Edit - I have the same server(a raspberry pi) connected via 2 intranets to my client. I don't know the IP address of the server as it is DHCP. The crude way to do is to reach the raspberry pi from one intranet and check with ifconfig to find the ipadress of the machine in the other Intranet. I want to know if there is any other way I can do it? I know the mac address of the machine.But I don't know how do I find the Ipadress based on the mac address.

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• I've inherited a rat's nest of cabling. What now?

  - by hydroparadise

  You know, you see pictures like below and sort of chuckle until you actually have to deal with it. I have just inherited something that looks like the picture below. The culture of the organization does not tolerate down time very well, yet I have been tasked to 'clean it up'. The network functions as it is, and there doesn't seem to be rush to get it done, but I will have to tackle the bear at some point. I get the ugly eye when I mention anything about weekends. So my question goes, is there sort of a structured approach to this problem? My Ideas thus far: Label, Label, Label Make up my patch cables of desired length ahead of time Do each subnet at a time (appears that each subnet are for different physical locations) Replace one cable at a time for each subnet It's easier to get forgiveness than permision?

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• Strategy to allow emergency access to colocation crew

  - by itsadok

  I'm setting up a server at a new colocation center half way around the world. They installed the OS for me and sent me the root password, so there's obviously a great amount of trust in them. However, I'm pretty sure I don't want them to have my root password on a regular basis. And anyway, I intend to only allow key-based login. On some cases, though, it might be useful to let their technical support log in through a physical terminal. For example, if I somehow mess up the firewall settings. Should I even bother worrying about that? Should I set up a sudoer account with a one-time password that will change if I ever use it? Is there a common strategy for handling something like this?

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