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• How to Boot a VMware Virtual Machine from a USB Drive

  - by Usman

  Do you have an OS installed on your USB thumb drive? Booting from it in a VM is now possible, you’ll just have to use a simple trick to get it to work. Last week we showed you how to put Ubuntu on a USB drive in a separate partition, and we also discussed working with VMware Player (our favourite VM Client). But have you ever tried booting from a USB drive in VMWare? It doesn’t allow doing so, but we will force it to boot from a USB, with a bit of old geekery. If you remember, we have showed you how to boot from a USB drive even if your old PC doesn’t allow booting from one. That’s right, using Plop Boot Manager. All we need to do is to load the Plop ISO in VMware, attach and enable the USB drive in VMware, and finally select the USB option in Plop Boot Manager to boot from the USB. So, visit the Plop boot manager download site. HTG Explains: When Do You Need to Update Your Drivers? How to Make the Kindle Fire Silk Browser *Actually* Fast! Amazon’s New Kindle Fire Tablet: the How-To Geek Review

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• Network config for KVM on physical machine with single NIC and single public IP

  - by neo0

  I have a physical machine running CentOS 6.4 and I will rent a place to run it in a data center. I want to install KVM on that machine to run some virtual machines. The problem is my physical machine have only one NIC and the data center give me a public IP for that interface. So how should I configure network on the physical machine to make it assign for each vm a private IP that can connect to Internet. If I create a br0 bridged with eth0 interface and create a vm with option --bridge=br0 then KVM could not assign an IP for the vm so setup can not be done. Should I use NAT mode? Does KVM have any host-only network like Virtualbox? But the vm still has to connect to outside? Thank you! Update I install the guest network using NAT (--network network:default) and then I only have to port-forwarding from the host. But if I config br0 bridged with physical eth0 then the guest can not get an IP from boot. So I removed the br0 and it worked.

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• Implementing a "state-machine" logic for methods required by an object in C++

  - by user827992

  What I have: 1 hypothetical object/class + other classes and related methods that gives me functionality. What I want: linking this object to 0 to N methods in realtime on request when an event is triggered Each event is related to a single method or a class, so a single event does not necessarily mean "connect this 1 method only" but can also mean "connect all the methods from that class or a group of methods" Avoiding linked lists because I have to browse the entire list to know what methods are linked, because this does not ensure me that the linked methods are kept in a particular order (let's say an alphabetic order by their names or classes), and also because this involve a massive amount of pointers usage. Example: I have an object Employee Jon, Jon acquires knowledge and forgets things pretty easily, so his skills may vary during a period of time, I'm responsible for what Jon can add or remove from his CV, how can I implement this logic?

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• 10 Annoying Habits of a Geeky Spouse (GeekDad Wayback Machine)

  <b>Wired:</b> "Everyone has annoying habits, and a sizable part of every successful marriage is learning to live with those things each other does that annoy you. I think it&#8217;s safe to say, too, that geeks have some habits that we think are awesome, but that non-geeks find a little&#8230;less awesome."

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• Diagram that could explain a state machine's code?

  - by Incognito

  We have a lot of concepts in making diagrams like UML and flowcharting or just making up whatever boxes-and-arrows combination works at the time, but I'm looking at doing a visual diagram on something that's actually really complex. State machines like those that parse HTML or regular expressions tend to be very long and complicated bits of code. For example, this is the stateLoop for FireFox 9 beta. It's actually generated by another file, but this is the code that runs. How can I diagram something with the complexity of this in a way that explains flow of the code without taking it to a level where I draw every single line-of-code into it's own box on a flowchart? I don't want to draw "Invoke loop, then return" but I don't want to explain every last detail. What kind of graph is suitable to do this? Is there already something out there similar to this? Just an example of how to do this without going overboard in complexity or too-high-level is really what I want. If you don't feel like looking at the code, basically it's 70 different state flags that could occur, inside an infinite loop that exists to a label based on some conditions, each flag has it's own infinite loop that exists to a label somewhere, and each of those loops has checks for different types of chars, which then runs off into various other methods.

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• ssh use with netcat to forward connections via bastion host to inside machine

  - by Registered User

  Hi, I am having a server in a corporate data centre who's sys admin is me. There are some virtual machines running on it.The main server is accessible from internet via SSH. There are some people who within the lan access the virtual machines whose IPs on LAN are 192.168.1.1 192.168.1.2 192.168.1.3 192.168.1.4 the main machine which is a bastion host for internet has IP 192.168.1.50 and only I have access to it. I have to give people on internet the access to the internal machines whose IP I mentioned above.I know tunnel is a good way but the people are fairly non technical and do not want to get into a tunnel etc jargons.So I came across a solution as explained on this link On the gateway machine which is 192.168.1.50 in the .ssh/config file I add following Host securehost.example.com ProxyCommand ssh [email protected] nc %h %p Now my question is do I need to create separate accounts on the bastion host (gateway) to those users who can SSH to the inside machines and in each of the users .ssh/config I need to make the above entry or where exactly I put the .ssh/config on the gateway. Also ssh [email protected] where user1 exists only on inside machine 192.168.1.1 and not on the gateway is that right syntax? Because the internal machines are accessilbe to outside world as site1.example.com site2.example.com site3.example.com site4.example.com But SSH is only for example.com and only one user.So How should I go for .ssh/config 1) What is the correct syntax for ProxyCommand on gateway's .ssh/config should I use ProxyCommand ssh user1@inside.machine nc %h %p or I should use ProxyCommand ssh [email protected] in nc %h %p 2) Should I create new user accounts on gateway or adding them in AllowedUsers on ssh_config is sufficient?

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• Finite state machine in C++

  - by Electro

  So, I've read a lot about using FSMs to do game state management, things like what and FSM is, and using a stack or set of states for building one. I've gone through all that. But I'm stuck at writing an actual, well-designed implementation of an FSM for that purpose. Specifically, how does one cleanly resolve the problem of transitioning between states, (how) should a state be able to use data from other states, and so on. Does anyone have any tips on designing and writing a implementation in C++, or better yet, code examples?

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• Cool Linux keyboard, X86 hardware ultimate geek sound machine

  <b>Handle With Linux:</b> "A keyboard running Linux on common hardware, at least the operating system. This is really a very Cool device."

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• Moving from local machine to group web development environment

  - by Djave

  I'm a freelancer who currently creates websites locally using something like MAMP to test websites locally before pushing them live with FTP. I'm looking at taking on my first employee, and I would need to be able to work on websites with them simultaneously. Can anyone explain or provide links to some good documentation on team workflow, or some key phrases I should be googling to get started on my set up? Unlike a lot of the stackoverflow community I've never worked in a dev team, large or small as I'm self taught so just need to know where to start. At present I'm thinking I need an extra computer to use as a server, then use Git or some such to version control files on that computer, as well as installing apache on it so it can be viewed by any computers in my current home network. Is this heading down the right track?

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• Ensure Mac's get correct machine name from DHCP?

  - by Greg Whitfield

  I have a problem in our network where our Mac's occasionally get given the wrong machine name while, I guess, getting a new DHCP lease. The DHCP servers are Windows based - the bulk of our network is Windows, but we have some Linux machines and an increasing number of Macs. The problem specifics is that occasionally a Mac will take on the name of another machine in the network. For example, I have a new Macbook Pro. In the OSX setup is gets called "gomez", and initially starts up on the network with that name without any problems. But after a few days when the machine was restarted (it had several restarts in the meantime), it ended up being called "florrie", which is actually the name of another machine in another part of the network. All network ops work fine, and indeed you don't notice most of the time - it's only when you run apps like Perforce that require the hostname that you get problems. I'm sorry I don't have more info than that, but if I know what to look for I can dig out some more facts. Or any hints on checking the network setup would be useful.

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• Installing Ubuntu with Windows installer on Windows 8 machine

  - by tpmeera

  I have a Windows 8 Ultrabook. I downloaded Ubuntu (release 12.04) and installed using the Windows installer (Wubi). On rebooting at the end of the installation, I get the Windows boot screen asking if I want to boot into Windows 8 or Ubuntu. I select Ubuntu, and I get an error message that says Ubuntu is missing a boot file or has errors. Please let me know how to fix, or if my procedure is incorrect.

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• Proxy Settings per Machine not working on windows server 2008 R2 SP1

  - by Anirudh Goel

  i have a very interesting problem and would appreciate any help for it. In my scenario i have scripts which bring up a VM inside a domain. Now i want to enable internet access for all the VM's and they go through a proxy. I interact with the VM's using remote sessions and use the credentials of a user which belogs to the domain administrator group. Now problem is that, i create VM's on the fly and destroy them as well,and the scripts i run during their lifetime require internet access on them.So i cannot statically set the proxy settings thus i used the option of Active Directory Group Policy Management. I initially used the "User Configuration" option and set the proxy, which worked like a charm when ever i log inside the machine. However it doesn't work if i use to remote login to the machine with an account which has not yet logged in to the machine. So i used this link to configure it to work on Per Machine, the group policy has worked fine and it reflects in the browser too. But i am not able to resolve any dns name like http://www.google.com or any internet based site. Any idea what i can do?

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• is gnome 3 is slow or my machine?

  - by user103054

  I have Dell XPS 15 i7 - 2360 with nvidia 525M (1GB) with optimus running Ubuntu 12.10 64 bit and have bumblebee installed for optimus. Recently I installed Gnome Shell to give it a try and found it sort of lagging under few scenarios though rest all is butter smooth. When I click on Date gnome 3 it appears as if a second has elapsed before the window is drawn. But others panel items like network or volume looks fine. In gnome 3 when I'm on dash with (window preview) if I remove any of the windows before the remaining windows reshuffle it takes about 2 seconds (noticeable clearly). Everything else is fine in both unity and Gnome Shell. What is causing this slowness? Is Gnome Shell is really slower?

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• Ubuntu Dual Screen Using Virtual Machine - AMD GPU

  - by Chris

  I've been searching online and reading tutorials and etc about how to make my ubuntu VM dual screen(x86_64). I have first tried to run these commands: sudo aticonfig --initial -f which gave me the ouput of: sudo: aitconfig: command not found I then googled the output and followed these instructions that I tells me to install my ATI drivers onto my ubuntu. wget http://www2.ati.com/drivers/linux/ati-driver-installer-11-5-x86.x86_64.run sudo sh ati-driver-installer-11-5-x86.x86_64.run --buildpkg Ubuntu/natty sudo dpkg -i *.deb sudo apt-get -f install sudo aticonfig -f --initial --adapter=all sudo reboot It all works well until I input sudo apt-get -f install which gives me the following output: sudo apt-get -f install Reading package lists... Done Building dependency tree Reading state information... Done 0 upgraded, 0 newly installed, 0 to remove and 25 not upgraded. 3 not fully installed or removed. After this operation, 0 B of additional disk space will be used. Setting up fglrx (2:8.850-0ubuntu1) ... update-alternatives: error: alternative link /usr/bin/aticonfig is already managed by x86_64-linux-gnu_gl_conf. dpkg: error processing fglrx (--configure): subprocess installed post-installation script returned error exit status 2 dpkg: dependency problems prevent configuration of fglrx-amdcccle: fglrx-amdcccle depends on fglrx; however: Package fglrx is not configured yet. dpkg: error processing fglrx-amdcccle (--configure): dependency problems - leaving unconfigured dpkg: dependency problems prevent configuration of fglrx-dev: fglrx-dev depends on fglrx; however: Package fglrx is not configured yet. dpkg: error processing fglrx-dev (--configure): dependency problems - leaving unconfigured No apport report written because the error message indicates its a followup error from a previous failure. No apport report written because the error message indicates its a followup error from a previous failure. Errors were encountered while processing: fglrx fglrx-amdcccle fglrx-dev E: Sub-process /usr/bin/dpkg returned an error code (1) At this point, I don't know what to do since running: gksudo amdcccle For the record, I have 3D acceleration turned on. The following is my GPU for my VM lspci | grep VGA 00:02.0 VGA compatible controller: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter Any Help on how I can make my VM dual screen with Ubuntu would be great. Thank you in advance.

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• "Error: Unknown error" when trying to start virtual machine from VMware server

  - by slhck

  Problem We are running VMware Server 2.0.0 build-116503 on a Ubuntu 10.04 LTS server. There is a virtual machine installed, running Lotus Domino on Windows Server 2003. Ever since a sudden power failure last week, the virtual machine won't properly start up. When I run the command: vmrun -T server -h https://127.0.0.1:8333/sdk -u root -p jk2x2208 start "[standard] lotus/test.vmx" … after 30 seconds it displays: Error: Unknown error That's about everything I get. I know the command is right, since that's what we've used all the time. This has happened last Saturday after a scheduled backup shutdown, and somehow I was able to start it again. This week, it happened again, and I can't get it back up. Occasionally, I also get: Error: Cannot connect to the virtual machine When I get this, and I run the start command, it seemingly works. Why is this so random? Which configuration could have been messed up? What I've tried / other info I already shut down VMware itself with /etc/init.d/vmware stop. This works. I tried to start VMware again with /etc/init.d/vmware start. It complains that it's "not configured", which is why I had to rm /etc/vmware/not_configured, and then try to start again. There have been no software updates on the machine, and no configuration changes

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• Cannot connect to Internet after using Windows XP on dual booted machine

  - by babelproofreader

  I have a dual booted Windows XP and Ubuntu 10.10 box (AMD64) and have an unusual problem in that after connecting to the internet on Windows I cannot connect using Ubuntu. I don't believe it is actually a problem with configuring my Ubuntu connections because when I get up in the morning Ubuntu connects without any problem - this problem only exists (and persists for at least several hours) if I try to connect using Ubuntu immediately after connecting using Windows. I don't know how long the problem actually lasts because I usually just go to bed and then in the morning I can connect without problems. It is not problem with my provider's service as I have a second Ubuntu 10.10 box which I manually connect and works even when the dual booted one (on Ubuntu) won't. It is a particular problem with the dual booted box. A power down reset does not solve the problem.

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• Kernel panic: "Machine check: processor context corrupt" after install

  - by Red

  I am new to Linux and I am having issues installing. I have tried multiple versions and all seem to give me the same issue. The LiveCD worked and I used it to install Ubuntu alongside Windows 7. Here's a few screen shots of what I get. I am currently trying to install most the most recent version of Ubuntu. System specs: x58 motherboard 12GB RAM Core i7 processor 2 Nvidia GTX 580 video cards in SLI configuration Thanks in advance and please feel free to simplify your answers as I am pretty new at this.

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• MySQL Config on Large Machine

  - by Jonathon

  We have a Windows 2003 Enterprise Edition server (64bit) running only MySQL 5.1.45 64-bit. It has 16G RAM and 10T of hard-drive space in RAID 10. We are having horrible performance from mysqld (85-100% CPU utilization). We were running a smaller machine with better performance, so I am assuming our my.ini file is not correct for our current machine. The my.ini file is as follows: [client] port=3306 [mysql] default-character-set=latin1 [mysqld] port=3306 basedir="D:/MySQL/" datadir="D:/MySQL/data" default-character-set=latin1 default-storage-engine=MYISAM sql-mode="" skip-innodb skip-locking max_allowed_packet = 1M max_connections=800 myisam_max_sort_file_size=5G myisam_sort_buffer_size=500M table_open_cache = 512 table_cache=8000 tmp_table_size=30M query_cache_size=50M thread_cache_size=128 key_buffer_size=3072M read_buffer_size=2M read_rnd_buffer_size=16M sort_buffer_size=2M #replication settings (this is the master) log-bin=log server-id = 1 Does anyone see anything wrong with this setup? For a machine with this much RAM, why in the world would mysqld eat up so much CPU? I know we can optimize some queries, etc., but it did run okay on a smaller machine, so I am pretty sure it is the config. Thanks in advance for any help.

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• I am trying to set up a ubuntu sever 12.04 on my machine

  - by Jseb

  I am trying to set up a server on my home network which will eventually host rails. I am not great in linux server and i try to follow the prompt. I did succesfully get to a black screen which then prompts me to a username then password to then do anything ( assuming). However here what i try to do I kinda fellow his tutorial http://www.ubuntugeek.com/step-by-step-ubuntu-11-04-natty-lamp-server-setup.html but however the command where not 100% like him not in same order but same idea. Then i want to install ubuntu server with gui here the command i try with sudo apt-get upgrade sudo apt-get install ubuntu-desktop Which however give me the following error Err http... inRelease w Failed to fetch ht... So been ignored if i try the desktop one i get E: unable to locate package ubuntu E: unable to locate package desktop So i am assuming i am not connected to the internet, so i try the following command sudo vi /etc/network/interfaces here the output it gives me and i know my gateway on my laptop is 192.168.1.1 address: 192.168.1.148 netmask: 255.255.255.0 network: 192.168.1.0 broadcasts: 192.168.1.255 gateway: 192.168.1.1 Btw i do not know the command to get out of vi and saving it. Err http://us.archive.ubuntu.com precises InRelease Err http://us.archive.ubuntu.com precises-updates InRelease Err http://us.archive.ubuntu.com precises-backports InRelease Reading package lists... Done W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise/InRelease W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-updates/InRelease W: Failed to fetch http://us.archive.ubuntu.com/ubuntu/dists/precise-backport/InRelease

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• Atheros AR928X wireless connection makes neighbourhood machine drop off line

  - by funicorn

  I have an Acer laptop with Atheros AR928X wireless card installed, supported by ath9k driver in the linux kernel. There are other 5 computers sharing wireless connection via a TPLink 150Mbit/s wireless router. At first I found the network is a little bit slower than it's in Windows7, which I accepted as it should be. However a very strange thing is, each time I connected to the router and downloaded stuff for a while, one of the computers running Windows7 in my local network dropped off from the router. And if I run my laptop under Windows7, everything is fine. What's even stranger is although the network becomes slower, only the certain computer drops and totally freezes in connection with the router. I'm not willing to conclude it's due to the unhealthy connection from my laptop to the router, however we have confirmed this for more than one times and there is no problem with the network when I'm running WIndows7. I'm extremely confused about what's going on. As a Linux user running Ubuntu over 5 years, I am awared that wireless driver in Linux is badly notorious of lack of stability and slow speed. But is it so bad that the unhealthy wireless connection can do damage to another computer in the same local network? I do see a lot of "Tx excessive retries" in iwconfig output. But how exactly does this happen ? Thanks for your help. I guess I have to use this answer box to show the outputs $ sudo iwconfig wlan0 IEEE 802.11bgn ESSID:"TP-LINK111" Mode:Managed Frequency:2.427 GHz Access Point: E0:05:C5:E8:A9:92 Bit Rate=121.5 Mb/s Tx-Power=16 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=47/70 Signal level=-63 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:2 Invalid misc:23 Missed beacon:0 To show what's wrong with the wireless connection, I ran iwconfig again within 3 minutes, during which time I hardly did anything and the network was not much busy than being nearly idle $ sudo iwconfig wlan0 IEEE 802.11bgn ESSID:"TP-LINK111" Mode:Managed Frequency:2.427 GHz Access Point: E0:05:C5:E8:A9:92 Bit Rate=121.5 Mb/s Tx-Power=16 dBm Retry long limit:7 RTS thr:off Fragment thr:off Encryption key:off Power Management:off Link Quality=48/70 Signal level=-62 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:9 Invalid misc:28 Missed beacon:0 You can see Tx excessive retires and Invalid misc increase very quickly. $ sudo iwlist wlan0 modu wlan0 unknown modulation information. $ sudo iwlist wlan0 channel wlan0 13 channels in total; available frequencies : Channel 01 : 2.412 GHz Channel 02 : 2.417 GHz Channel 03 : 2.422 GHz Channel 04 : 2.427 GHz Channel 05 : 2.432 GHz Channel 06 : 2.437 GHz Channel 07 : 2.442 GHz Channel 08 : 2.447 GHz Channel 09 : 2.452 GHz Channel 10 : 2.457 GHz Channel 11 : 2.462 GHz Channel 12 : 2.467 GHz Channel 13 : 2.472 GHz Current Frequency:2.427 GHz (Channel 4)

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• Unable to install Ubuntu 12.10 on windows 8 machine/ error no5

  - by JOBIN VARGHESE

  installing crashes at halfway of 'copying files' showing an i\o device error error no5; there was problem in beginning of installation too, ubuntu was not detecting the installed windows 8. my system is a dell inspiron 5520 laptop ,with 1 tb WDC hard disk in GPT ,with EFI . my current partition is like 102 mb EFI SYSTEM partition 200 gb Windows 8 ntfs 22 gb root Ext4 8 gb swap 20 db home Ext4 680 gb ntfs Drive for storing all my files. i tried both dvd disc and usb drive, both resulted in same error. inbuild dell hardware diagnosis utility showed both hard disk and dvd drive as healthy what may be the reason and how can i install ubuntu along side my windows 8?

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• Need to configure 4 Serial ports virtualbox guest win machine (my host is ubuntu 11.10)

  - by ubu

  I have an application that run's on winNT and requires the APCI-7500 card (a 4-multiport serial card), so I've installed the winNT thru virtualbox, but as i try to configure the serial ports I notice that virtualbox shows only 2 serial ports, only 2 tabs in the ports configuration section.How can I add the other 2 ports and configure them. My host is ubuntu 11.04 My guest is winNT My virtualbox version is 4.0.4_OSEr70112 I'll appreciate any help. Thanks in advance. I've followed these threads but still get no light in this issue How to access serial ubuntu host serial port on VirtualBox guest OS Can't access host serial port on VirtualBox Winxp

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• Foraward Traffic from local machine to proxy server using iptables

  - by Vaibhav

  I am using Ubuntu Server 12.04. My IP is 192.168.4.160. I want to route the HTTP traffic generated locally from my system destined to a particular URL (say x.x.x.x) to pass through proxy server. My proxy server is 192.168.0.13:3128. I added following rule in iptables sudo iptables -t nat -A OUTPUT -p tcp -d x.x.x.x --dport 80 -j DNAT --to 192.168.0.13:3128 However, this rule does not seem to work for me. I captured packet in wireshark and I saw that packet is still going to x.x.x.x I am not very much familiar with iptables, so please try to be specific. Thanks in advance

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• Working on a virtual machine as a developer

  - by Johnny000

  In the company I'm currently working in, they decided that each developer will move to a VM desktop (Citrix/WinServer2012) an develop/test from there with restricted/no rights to install new software. The Server we will be working on are in a remote Datacenter. So i.e. if for some reason or another the internet brake down, we can't work till the connection is up again. As a developer I don't want to use windows as OS for my working/development environment as there is no need because we don't develop OS specific software. What good points could I raise in an argumentation against moving to the VMs beside the loss/restriction of freedom and the loss of connection to the internet?

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• Fastest way to run a JSON server on my local machine

  - by Mohsen

  I am a front-end developer. For many experiemnets I do I need to have a server that talks JSON with my client side app. Normally that server is a simple server that response to my POSTs and GETs. For example I need to setup a server that saves, modifies and read data from a "library" database like this: POST /books create a book GET /book/:id gets a book and so on... What is the fastest and easiest technology stack for database and server in this case? I am open to use Ruby, Nodejs and anything that do the job fast and easy. Is there any framework (on any language) that do stuff like this for me?

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