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  • Is it ok to throw NotImplemented exception in virtual methods?

    - by Axarydax
    I have a base class for some plugin-style stuff, and there are some methods that are absolutely required to be implemented. I currently declare those in the base class as virtual, for example public virtual void Save { throw new NotImplementedException(); } and in the descendand I have a public override void Save() { //do stuff } Is it a good practice to throw a NotImplementedException there? The descendand classes could for example be the modules for handling different file formats. Thanks

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  • how to make this "action-packed, random data" being echoed in a terminal?

    - by RiMMER
    OK, this isn't really a question to achieve anything practical, but still it is a serious question and I hope it will be taken seriously and mods won't punish me for this :) I'm sure majority of you have seen some good action movie, where CIA or FBI or hackers or any other "pc nerds" are "retrieving some information" and when they actually show their screens/monitors/desktops, there is a lot of random data being displayed and it's just so thrilling :D So, we're shooting a movie and I need to reconstruct such a scene. My OS is ubuntu 10.10. I think i've read somewhere on the internet once that shell can actually be recorded and then played back, but I'm not sure how it worked. If there's anyone who could come up with a solution, it would be so cool! Let's make this fun, shall we?

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  • Terminal Asks for Email and Password, how do I Programmatically fill it out (in Ruby)?

    - by viatropos
    I am running a command to push files to Google App Engine, and it might ask me for my email and password: $ appcfg.py update . Email: [email protected] Password: I am running that in Ruby right now using this: %x[appcfg.py update .]. How can I fill out the email and password? I have seen something like this with capistrano: %x[appcfg.py update .] do |channel, stream, data| channel.send_data "#{yaml['production']['email']}\n" if data =~ /^Email:/ end ...but haven't figured out how to set that up without it. What's the best way to fill out things the command line asks for programmatically?

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  • Encoding over SSH Issues

    - by user1104160
    I have a Linux machine and a Windows machine, both using Vim with the Powerline plugin. They both work great with patched fonts. Next, I want to SSH onto an OSX 10.6 machine and also use the Powerline in the terminal with Vim. However, I get weird symbols with normal mode ("^^B" in one area) and fancy mode ("~@" and "~B" spread throughout the bar. I thought this mixup was an encoding issue, but when I look at Putty's encoding it is using UTF-8 and the same with the Ubuntu terminal. Additionally, on the OSX machine, "locale" returns "en_US.UTF-8" for all variables (I set it to do that in order to troubleshoot). However, the symbols are still showing. I am using a patched font (Inconsolata, the same one as the Ubuntu terminal) for the OSX terminal, so I am stumped. Is there a missing component to this equation? Are there additional problems that can arise from SSH encoding? On the OSX end, additionally, these same symbols appear, so it may not even be related to SSH and therefore I'm totally lost.

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  • SSH sometimes screws up connection when terminal overflows?

    - by SeveQ
    I've got a problem with SSH on a Debian Lenny based server (it's a vHost within a Xen environment, booted on a Xen kernel). I hope someone can help me with this. The SSH connection seems somehow getting screwed up frequently when the terminal overflows (new lines beyond the bottom of the terminal, usually forcing it to scroll). The connection gets lost but not regularly disconnected. It nearly always happens when I do the following: an existing SSH connection gets disconnected (regularly) I order putty to reestablish the connection login-prompt appears at the very bottom of the putty terminal window I enter my login-name, press the enter key I'm asked for the password, I enter it, press the enter key and BOOM! Nothing more happens. I have to reconnect again. So it is reproducable. I'm not totally sure if the connection crashes before or after I enter the password. Furthermore it also happens when there is much text to be displayed (for example when I compile something or do an ls -l on a directory with many entries). Using 'screen', however, helps to reduces the frequency of occurence but doesn't solve the problem completely. It's occurence is independent from which terminal software I use. I mostly use putty but it also happens with other clients. I certainly hope somebody can help me solving this problem. Thanks in advance! //edit: I've just made a Wireshark trace of the ssh connection and there is nothing, I repeat, nothing different between the working and the failing connection (at least aside from frame numbers, ports and times that obviously can't be equal). This leads me to the assumption that the error has to happen on the server's side.

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  • GPO - Setting not applied, although policy is applied

    - by Kenny Bones
    This is rather strange. In our domain we have several terminal servers and this morning a user reported that no drives are mapped when he logs on to the terminal server. So, I checked Group Policy Results and compare two users. Both users have the exact same policies applied. But for this particular user, the Script section under User Configuration - Policies - Windows Settings is just not there. For the other user, which this is working fine for, it says under the Script section that Winning GPO is Terminal2008, which is the GPO that contains the script section. And the Terminal2008 GPO is applied to both users. Also, the loopback processing is set to Replace. What could be the cause for this? I've never seen this particular issue before. I mean, both users are in the same OU, they log on to the same terminal server and the same policies are applied to both. They do not however have the exact same group memberships, but should that matter? It's not stated that the script should be run only if the user is a member of a certain group either. Not sure if that could be done through that specific setting either.All I know is, the very same policies are applied to both users, in the same OU and the same computer. Meaning, the same policies should be applied? Edit: I just ran Group Policy Results on one of the other terminal servers, which are also in the same OU, and the Scripts section is there! This means that this particular user don't get this setting when he's logged onto this particular server. What could be the cause of this?

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  • how do you view / access the contents of a mounted dmg drive through TERMINAL hdiutil diskmount

    - by A. O.
    My external USB drive failed. I made a .dmg image file of the drive using disk utility. Later I was not able to mount the .dmg image. I used terminal hdiutil attach -noverify -nomount name.dmg diskutil list diskutil mountDisk /dev/disk4 then received the following message: Volume(s) mounted successfully However, I cant see the drive or access its contents through Finder. DUtility shows the drive as ghost but I still cant mount it using diskutility. Terminal tells me that the drive is mounted and constantly shows it in the diskutil list. pwd is not the mounted .dmg image. I dont know how to enter into the mounted image drive to see its contents. So in case what I said sounds like I see the files in the mounted image no this is not the case. I do not know how to access or even change the pwd within Terminal. I was hoping to see the mounted drive tru finder but I do not see that. So I need help as to how to find a way to access the mounted image drive if it was really mounted. Terminal says that it was and it shows it under diskutil list as a /dev/disk4. Can someone please help me access the files on this drive?

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  • Not enough physical memory available to run Virtual Machine

    - by unknown (google)
    hi I when i am trying to run virtual machine on VMW 6.5 it shows me following error. "Not enough physical memory is available to power on this virtual machine with its configured settings. To fix this problem, adjust the additional memory settings to allow more virtual machine memory to be swapped. If you were able to power on this virtual machine on this host computer in the past, try rebooting the host computer. Rebooting may allow you to use slightly more host memory to run virtual machines." i have also tried options that are suggested from above error, but still its not working. Can you help me to solve this problem? Thanks

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  • Virtual Disk Degraded

    - by TheD
    There is a physical DC with a Raid 1 Mirror, 2 Physical Disks, 500GB each. Dell Server Administrator is installed on the DC, and is reporting both physical disks are fine, online, in a good state etc. On a PERC S300 Raid Controller: Physical Disk 0:0 Physical Disk 0:1 However at the same time it's reporting that a virtual disk is degraded, what exactly does this mean? The virtual disk indicates it's State is in a Raid 1 Layout. Device Name: Windows Disk 0 If my understanding is correct then the Virtual Disk, when you drill down into Dell OpenManage should have both physical disks as members, as it is a mirror? Is this correct? However, when I drill down into the Virtual Disk, it only displays Physical Disk 0:0 included in Virtual Disk 1. I'm very new to server side/raid management etc. just while our server techy is away! Thanks!

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  • Virtual Windows desktop

    - by Zack
    Is there any virtual desktop software that can virtualize desktop just like a virtual desktop to sandbox (sort of like virtualization and sandbox combined). I want to create many desktop and each of them must be sandbox. For example if I have virus infected in one of the desktop, I just have to clear or close the desktop and everything is fine. Is there any software that can do that kind of jobs that I have mentioned? Remember I am not asking recommendation of software, but the software that can do the job. UPDATE: I mean that every virtual desktop is working as a virtual box or sandbox. Clearing or closing the desktop will work as shutting down that virtual box.

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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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  • 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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  • virtual box strectch to fit resolution

    - by Scarface
    Hey guys I have a really annoying problem, that I hope someone has figured out. I just installed ubuntu on virtual box and installed the guest additions so everything was great. I had a resolution that stretched across my screen from left to right and the only virtual box components that were visible were the windows vista title bar : minimize/exit/maximize buttons and virtual box controls at the bottom. Now all of a sudden now that I have installed the ubuntu 170mb of automatic updates, I see vertical and horizontal scroll bars that are part of virtual box and the ubuntu resolution will not stretch across my screen anymore. What I want is a ubuntu resolution that will stretch to fit the maximized window of virtual box, and remove the scroll bars. If anyone has any ideas, I would really appreciate it.

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  • non-mapped virtual memory & total number of connections

    - by tszming
    We have two MongoDB data nodes (replica set) - Primary & Secondary. I noticed that the non-mapped virtual memory is relatively high and wondering if they are hurting our MongoDB performance (The server usually peaked at around 6-7K queries per sec). In MMS, it was stated: "The most common case of usage of a high amount of memory for non-mapped is that there are very many connections to the database." So we checked the memory usage with db.serverStatus().mem in our Secondary: { "bits" : 64, "resident" : 6846, "virtual" : 416797, "supported" : true, "mapped" : 205549, "mappedWithJournal" : 411098, "note" : "virtual minus mapped is large. could indicate a memory leak" } Note: We are using 2.0.4 and now the default stack size should be 1MB per connection. The current number of connections is around 1.1K, but the non-mapped virtual memory (virtual-mappedWithJournal) is around 5699 MB. The trend is quite stable so I can't say there is a leak here, but where is the memory gone? Any idea?

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  • Run command with no terminal output

    - by Insomaniacal
    Hello, I've searched around online, but can't find the answer to my question. What I want to do is run a command in pythong, using the subprocess module, and store the output in a variable. However, I do not want the command's output to be printed to the terminal. For this code: def storels(): a = subprocess.Popen("ls",shell=True) storels() I get the directory listing in the terminal, instead of having it stored in a. I've also tried def storels(): subprocess.Popen("ls > tmp",shell=True) a = open("./tmp") [Rest of Code] storels() This also prints the output of ls to my terminal. I've even tried this command with the somewhat dated os.system method, since running "ls tmp" in the terminal doesn't print ls to the terminal at all, but stores it in tmp. However, the same thing happens. I'm using python 2.6. Any suggestions? Thanks in advance!

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  • vmware player won't run on CentOS due to missing /dev/vmmon, what could be the problem?

    - by Graphics Noob
    So I've tried installing vmware player 3.1.4 and 3.1.3 and both times had the same problem, when I try to load a VM I get the error "Could not open /dev/vmmon". When I ls /dev/ I can see there is no "vmmon" device present. When I try running: sudo /etc/init.d/vmware start I get the output: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [FAILED] which shows that the Virtual Machine Monitor fails to load. I tried following the advice on this site and ran vmware-modconfig --console --install-all I notice during the compilation there are no errors, but at the end I get the message: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [ OK ] Unable to start services Out of curiousity I tried: sudo /sbin/insmod /lib/modules/2.6.18-238.9.1.el5xen/misc/vmmod.ko But got the error message: insmod: error inserting 'vmmon.ko': -1 Invalid module format I have a feeling this may be the root of the problem, but I don't know what could be causing it or how to fix it.

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  • vmware player won't run on CentOS due to missing /dev/vmmon, what could be the problem?

    - by Graphics Noob
    So I've tried installing vmware player 3.1.4 and 3.1.3 and both times had the same problem, when I try to load a VM I get the error "Could not open /dev/vmmon". When I ls /dev/ I can see there is no "vmmon" device present. When I try running: sudo /etc/init.d/vmware start I get the output: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [FAILED] which shows that the Virtual Machine Monitor fails to load. I tried following the advice on this site and ran vmware-modconfig --console --install-all I notice during the compilation there are no errors, but at the end I get the message: Starting VMware services: VMware USB Arbitrator [ OK ] Virtual machine monitor [FAILED] Virtual machine communication interface [ OK ] VM communication interface socket family [ OK ] Blocking file system [ OK ] Virtual ethernet [ OK ] Unable to start services Out of curiousity I tried: sudo /sbin/insmod /lib/modules/2.6.18-238.9.1.el5xen/misc/vmmod.ko But got the error message: insmod: error inserting 'vmmon.ko': -1 Invalid module format I have a feeling this may be the root of the problem, but I don't know what could be causing it or how to fix it.

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  • MSTSC crash on connect

    - by rotard
    We are supporting a client with primarily Windows XP machines. The users need to use Remote Desktop to connect to a terminal server. Unfortunately, after upgrading to SP3 on some machines MSTSC.exe crashes when they try to connect to the terminal server (a Win 2008 machine). The resolution I have found has been to revert to an older version of MSTSC as described here: http://it.tmod.pl/Blog/EntryId/115/Remote-Desktop-Connection-crashes.aspx . Another tech at my company independently arrived at a similar solution. Unfortunately, now some of the user's printers are missing (when connected tot he terminal server). Has anyone else seen this issue? How did you resolve it?

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  • Terminal services and memory limits

    - by Mark Wassell
    Is there a way in Terminal Services to set limits on memory related parameters for a process. For example working set size and, possibly, if it makes sense, total virtual memory allocation for the session? To turn the question around, we have an application which cannot allocate as much virtual memory running on a terminal server as it can when running on a desktop PC (both I would expect to have a limit of 2GB for user mode address space) and I was wondering if there is another limit for processes or users on a terminal server. Perhaps even 2GB per user rather than per process.

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  • Mandatory Profiles on a Server 2003 TS Box

    - by Chloe
    I have a Windows Server 2003 box which will be acting as a terminal server. It will actually be running Citrix, but I don't believe that to be relevant here. There has been a request for every user to use a single mandatory profile. I've used mandatory profiles before, but there have been generally different profiles for different users so I've always used the "Terminal Services Profile" tab to good effect. What I'd like this time is a single setting, such as a Group Policy or similar that simply forces every non-domain admin user logging on to the box into using the mandatory profile. We'll be using Folder Redirection to take care of everything else. I'm aware of the following GPO: Computer Policy\Computer Configuration\Administrative Templates\Windows Components/Terminal Services Set path for TS Roaming Profiles But, as that's a computer policy, will it not apply to all users including administrators? If so, is it possible to exclude admins somehow?

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  • Problems switching to QEMU control panel with -nographics

    - by tor
    It seems that the terminal does not recognise CTRL+ALT+2 when typed, so I don't know how to quit the QEMU emulation, or switch to the QEMU control panel. I am running Mac OSX Lion, and I type $ qemu-system-arm -M verdex -pflash flash.img -nographic -sd sdcard.img to start QEMU emulation of an ARM system in the Terminal. I learned from this site that typing CTRL+ALT+2 should work, but the only thing that happens to me, is that a "2" is printed on the command line of the virtual operating system. Any ideas on what could be wrong? Is this a Mac specific issue? (The same problem occurs in both terminal.app and iTerm2)

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  • Tab title is wrong with ssh/screen on osx

    - by sds
    I am doing ssh -t host screen -D -RR in OS X (10.9) terminal tabs. My ~/.screenrc is identical on all remote hosts and contain the following line: hardstatus string "%H(%n:%t)$USER %h" My ~/.bashrc is also identical on all hosts. When I login to host host_u (Ubuntu 12.04.3 LTS) running Screen version 4.00.03jw4 (FAU) 2-May-06, the tab title on the OS X terminal is host_u(1:bash)sds ~, as expected. When I login to host host_c (CentOS release 6.3 (Final)) running Screen version 4.00.03 (FAU) 23-Oct-06, the tab title on the OS X terminal is ~/FooBar (which is the local OS X directory from which I ran the ssh/screen command. Problem: the hardstatus line does not work on host_c.

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  • [Ubuntu] How can i log-in to Ubuntu using USB-serial console (rs232) ?

    - by marc
    Welcome, How can enable remote terminal login into Ubuntu 9.10 using usb-serial terminal ? I got created device ttyUSB0 and i want allow to log-in using hyper-terminal. I found some resources but they are related to real! hardware rs232 ports, i can't find any information about USB converter. Right now i have established connection between that usb-serial port and my laptop (i can send text writing to port cp sometext.txt /dev/ttyUSB0 and read using hyperterminal). Any idea ? Regards

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  • Installed Java 7, but terminal still shows Java 6

    - by chipbk10
    I've installed Java 7 on my Mac (10.7.5), but in the terminal there is still java 6. java version "1.6.0_37" Java(TM) SE Runtime Environment (build 1.6.0_37-b06-434-11M3909) Java HotSpot(TM) 64-Bit Server VM (build 20.12-b01-434, mixed mode) There will be no problem with the version 6 on terminal, if I always got that errors when I tried to install a java application (LatexDraw): : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 : CGContextGetCTM: invalid context 0x0 : CGContextSetBaseCTM: invalid context 0x0 The problem is related to instability of java 6 inferred from this link I've read this installed-java-7-on-mac-osx-but-terminal-is-still-using-version-6 and also try to change my Java version by using export JAVA_HOME="/System/Library/Frameworks/JavaVM.framework/Versions/1.6.0/Home", but in my folder /System/Library/Frameworks/JavaVM.framework/Versions, there is no version 1.7, only versions under 1.6 ??? So, how can I fix this issue?

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