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• How to create launch icons on Ubuntu Desktop?

  - by MattSlay

  I installed Ubuntu in a VM using VirtualBox, and after a few hours of Googling all the things I had to install and configure for the rest of the environment, I am finally up and running with a Ruby on Rails IDE and have MySql up and running. After I start up the Ubuntu VM, I have to go to a terminal window and do this to start MySql: /etc/init.d/mysql start So that works fine, but, since I am such a GUI person, I’m wondering how I can create an icon on the Ubuntu Desktop that I can click on to launch this command. Can you tell me how to do that?

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• how to include screen's session name in hardstatus?

  - by fungusakafungus

  I use different screen sessions for different projects. Starting screen like screen -S project1. Now, I'd like to mention 'project1' in hardstatus line. Session name can be obtained from environment variable STY: STY=13539.project1. But how to get this into screen? I've tried backtick command and %` in hardstatus, but I can't seem to get it right. What I did: .screenrc: hardstatus string '%H:%`' backtick 0 30 30 echo $STY no luck, empty %`. backtick 0 30 30 sessionname still no luck, sessionname: Not found

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• gevent with Django as daemon

  - by jonathonmorgan

  I've been developing an app using django_socketio (a python port of the Node equivalent), which relies on gevent. It ships with a Django management command that runs gevent's pywsgi server, but that of course stops when I close my terminal window, just like Django's dev server. This is a proof of concept, and there's no expectation that it would hold up in a production environment, but I'd like to have the server at least "permanently" process HTTP requests, so I don't need to manually start the dev server in order to demo. I'm assuming I need to run this as a daemon process, but prior to this I've only used apache and mod_wsgi, so unsure of where to begin, or even how I would go about starting a daemon. I found gevent-spawn, which looks promising, but it's unclear to me how that code is executed. Basically, how would I use gevent to serve a Django app in a setting without manually starting/stopping the server?

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• Default maximum heap size -- Ubuntu 10.04 LTS, openjdk6-jre

  - by sachin

  I just installed openjdk6-jre on Ubuntu 10.04 java version "1.6.0_20" OpenJDK Runtime Environment (IcedTea6 1.9.2) (6b20-1.9.2-0ubuntu1~10.04.1) OpenJDK 64-Bit Server VM (build 19.0-b09, mixed mode) Every time I run "java" I get this error: Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. This can be solved by specifying a maximum heap size and running "java -Xmx256m" But is there anyway to permanently fix this error (i.e. set the default heap size to 256MB so that I do not need to specify the max heap size every time I run the command)

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• Using robocopy and excluding multiple directories

  - by GorrillaMcD

  I'm trying to copy some directories from a server before I restore from backup (my latest backup was corrupt, so I have to use an older one :( ). I'm in the Windows Recovery Environment and have access to the server's file system G:\ and my backup media C:\. But, since I'm more familiar with Linux, I'm having a bit of trouble with the command line in Windows, specifically robocopy. I want to copy multiple directories (maintaining the same directory structure) from G:\ to C:\ while excluding others (namely, the Windows and Program Files folders). I can't figure out the syntax for the /XD option. I was hoping to do something like: robocopy G: C:\backup /CREATE /XD "dir1","dir2", ...

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• Is it possible to cause artificial network packet loss or latency?

  - by nbolton

  I'm trying to reproduce some issues on a deployed application where the MSSQL server and client are running in two separate machines. I think there may be network issues between the two machines, so I'd like to try and reproduce these conditions on two Hyper-V virtual machines (on the same virtual server). Of course, the network for these virtual machines is "local" so it's actually far from the conditions in a live environment. Is there a program I can run on either virtual machine which will degrade the network performance? Or maybe any other work arounds? For example, one way to reproduce the conditions may be to run the VMs on separate Hyper-V servers in geographically dispersed locations (so the SQL traffic goes over VPN or something) -- but this is a little long winded I think. There must be a simpler way.

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• How do I change HOMEDRIVE HOMEPATH and HOMESHARE in Windows XP?

  - by user26034

  I have got a laptop which is configured to have the user profile in a network drive. This is causing me a lot of headaches since the connectivity to my company is very slow. I want to relocate the profile of my user into a local directory. How do I do that? Those are the settings at the moment: C:\>set HOME HOMEDRIVE=P: HOMEPATH=\ HOMESHARE=\\SOMESERVER\_myuser$ The drive P is a network drive mapped to HOMESHARE. I can't find where windows is setting those environment variables, not even in the registry. The laptop is running Windows XP.

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• better options for screen?

  - by lonestar21

  OK. So I love screen. It has saved my bacon a few times when machines crash or get disconnected from the network. However, there are enough reasons keep keep me from using screen for everything, which include: Pain in the butt scrolling. Why can't I just interact as though this is a normal bash shell? My keyboard shortcuts are gone. I have a number of things customized in my bash environment, is there a way to get them to work in screen as well? Are there any tools our tips that I can use to make my screen-using experience as high quality as my bash using experience?

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• How do I use a URL path instead of a file path in an Open File dialog in Mac OSX or ChromiumOS?

  - by Chris

  In Windows 7 (and perhaps earlier), the default "Open File" dialog box allows you to type a full URL into the "File name" section as if it were a file path, e.g. "http://www.example.com/pic.gif" instead of "C:/windows/pictures/pic.gif". When uploading a file to a website on the client side - say, an image - this allows the client to upload a picture located on a server accessible via the URL instead of downloading the image, saving it locally, then referencing the local image in the "Open File" dialog. It's a great option for Windows users. I have three separate questions: What is this procedure formally called? How do I describe this succinctly so that my searches for more information are fruitful? Can something similar be done in Mac OSX, Chromium OS, or a Linux environment? If so, how? Thanks!

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• Any recommendations on a NAS for a home-super-user?

  - by marc_s

  Can anyone recommend a good NAS for use in a home-server environment? I would request at least 2, preferably 4 disks, and I am most interested in good to excellent throughput for file-server and backup purposes - don't need any of the fancy media-streaming or -sharing features, that's not of interest to me. For a 4 or more disk solution, support for the various RAID levels (0, 1, 1+0, 5) would be a plus - especially if supported in hardware (rather than just a software emulation). I just need a place to put my collection of data, ISO images, and so forth - and since several external disks (self-built and off-the-shelf) have failed so far, I'm looking into a more reliable solution. Marc

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• scp using a password on the command line

  - by spierepf

  I am trying to write a script that will deploy a build created on my desktop machine (windows/cygwin) to a machine in my test environment (linux). I would like to use scp to copy the build to the target machine. The only account on the target machine is root, and I cannot create a special user for this task. The root user is unable to log in using an ssh key (I suspect that this is configured on the ssh server, but I do not know which configuration options control this). At any rate, I cannot change the configuration of the ssh server. My desktop machine uses Cygwin, and I have ssh installed. What I need is the command-line-fu that will allow me to put the password on the command line. I am aware of the dangers of having a plaintext password in a shell script, but that is not a concern here.

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• Decrypting a TrueCrypt drive pulled from another machine

  - by Blakeg08

  I work in a corporate environment and we are now required to encrypt laptops. I have already encrypted about 5 or 6 out of 40. I still have a few questions before we go all out with TrueCrypt. Can I decrypt a hard drive by plugging it into my desktop using a data transfer kit? I tried this and the hard drive showed up asking me to format before using the volume. If I have the TRD from each laptop backed up do I still need to backup the volume headers? What else do I need to back up? Thanks.

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• Is Apache ReverseProxy to Passenger Standalone an acceptable production deployment?

  - by davetron5000

  I have the need to deploy Rails 3 apps, using RVM and gemsets, and am expecting “public” traffic (i.e. this is not an internal-only app). I also must use Apache as the public interface to my app. I understand that Passenger Standalone can help accomplish the rails/RVM end, and I have successfully set it up in my development environment. My question is how viable this setup is for a production deployment. Is deploying via Apache configured to ReverseProxy to my passenger-powered Rails app going to create problems? Since I'm designing the production deployment now, I want to understand if I should spend the additional time to set up Passenger connected to Apache and have that Passenger communicate with Passenger Standalone instance running my Rails app. So, I'm looking for one of I guess three answers: Apache Reverse Proxy to Passenger Standalone will be generally fine You should not use the Apache/Passenger Standalone configuration, but set up Passenger on the Apache side as well Your entire setup is just Wrong, please RTFM (and include link to "FM")

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• Windows equivalent for Linux "screen" or another alternative?

  - by Ubha

  Hello all! I'm on the lookout for a method to control programs in a Windows environment. I would prefer it to be a bit similar to the Linux software "screen". The reason of my search is that I need to start a program (on Windows) with an identifier, so I later would be able to close that specific program, without closing anything else - even though the actual program (.exe file) is running multiple times. So is there anyway I can "name" it? I'm using the following on Linux now: $ screen <params> <id> ./softwareprogram And then I know I can always find it with it's ID :) It's an external program which is closing or starting a 3rd party program. My program is written in C++, if that does any difference. Thanks :)

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• MySQL server hangs after approximately 1 month (CentOS)

  - by user25061

  Hey guys, I've got a web server running Apache/PHP and MySQL (CentOS), and MySQL seems to hang once every month or so. As far as I can tell, there are a few slow queries that are being resolved, but other than that I can't really see any reason why MySQL would hang. I'm having problems determining the problem - nothing is showing up in /var/log/mysqld.log, and again there are a few slow queries, but nothing out of the ordinary. Load is average at the time of the crashes... Can I please get some hints on how to work out the issue? I can't reproduce on our staging environment, so I'm a little stuck.

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• Automated VLAN creation with residential Wireless devices

  - by Zephyr Pellerin

  We've got a few WRT devices from Linksys here, and the issue has arisen to deploy them in a relatively small environment, However, in the interest of manageability we'd like to be able to automatically VLAN (ideally NOT subnet) every user from one another. It seems obvious to me that the default firmware isn't capable of this - can OpenWRT/Tomato/DD-WRT support any sort of functionality such that new users are automatically VLANed or otherwise logically separated from other users? It seems like there's an easy IPtables or PF solution here, but I've been wrong before. (If that seemed a little ambiguous, heres an example) User 1 sends DHCP request to server, new VLAN (We'll call VLAN 1) is created, user is placed in that VLAN. Then, user 2 sends a DHCP request and is placed in VLAN 2 etc. etc.

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• How can I get the current OU with a PowerShell login script?

  - by Frans

  I am setting up a Terminal Server 2008 which will be used by different client organisations, each with multiple individual user accounts. I would like each client organisation to have a drive mapped to \server\clients\ Their OU name is also their client name, so I would like to be able to find their current OU and then use it for the mapping command. The OUs are hierarchicals, so it is the bottom-most OU name I need. Example OU: Dedicated Clients\AjaxCorp Should get a drive mapped to \\server1\shares\AjaxCorp Any suggestions on how I can get the OU? I am sure it must be easy, I just haven't figured it out... I did find information about how to do this with VB script, but as it is a whole new environment I thought it would be nice to use PowerShell instead.

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• Lost the shift+< and shift+> key combinations

  - by REA_ANDREW

  On my Laptop I have somehow lost the shift+< and shift+ key combinations. Setup: Ubuntu 12.10 OS Windows 7 running in Virtual box Synergyc running on the Linux Host Connected to Synergys running on my desktop machine, also running Ubuntu 12.10 Info The key mappings are fine in Linux. This has happened following an install of vsvim inside of Visual Studio 2012. Now globally inside this particular Virtual Box instance I can no longer use shift+< and shift+ Funnily enough when I go to the VS Key mapping finder it shows me that: Shift+< mapped to Ctrl+Shift+Alt+Z Shift+ mapped to Ctrl+Shift+Alt+X I have asked in super user as this is also affecting the windows environment. Any help, greatly appreciated. TIA

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• Security considerations in providing VPN access to non-company issued computers [migrated]

  - by DKNUCKLES

  There have been a few people at my office that have requested the installation of DropBox on their computers to synchronize files so they can work on them at home. I have always been wary about cloud computing, mainly because we are a Canadian company and enjoy the privacy and being outside the reach of the Patriot Act. The policy before I started was that employees with company issued notebooks could be issued a VPN account, and everyone else had to have a remote desktop connection. The theory behind this logic (as I understand it) was that we had the potential to lock down the notebooks whereas the employees home computers were outside of our grasp. We had no ability to ensure they weren't running as administrator all the time / were running AV so they were a higher risk at being infected with malware and could compromise network security. With the increase in people wanting DropBox I'm curious as to whether or not this policy is too restrictive and overly paranoid. Is it generally safe to provide VPN access to an employee without knowing what their computing environment looks like?

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• Is it a good idea to take onsite/offsite backups of server images?

  - by ServerAdminGuy45

  Assuming a non-virtualized environment it a good idea to take actual images of servers (using something like Acronis True Image) and store them on\off site? Backing up data is great but I feel it would be good to have copies of OS images in the event hardware dies or an upgrade gets botched I can always revert back. What would be your recommended way to do this (preferably using a NAS and an online backup service)? I was talking with the Iron Mountain folks and the service they described is more geared toward taking incremental snapshots of data. I'm not sure if there's a way to backup images in an incremental way such that only the changes between them are saved (that way I'm not wasting X GB each time I take an image).

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• Best practice for administering a (hadoop) cluster

  - by Alex

  Dear all, I've recently been playing with Hadoop. I have a six node cluster up and running - with HDFS, and having run a number of MapRed jobs. So far, so good. However I'm now looking to do this more systematically and with a larger number of nodes. Our base system is Ubuntu and the current setup has been administered using apt (to install the correct java runtime) and ssh/scp (to propagate out the various conf files). This is clearly not scalable over time. Does anyone have any experience of good systems for administering (possibly slightly heterogenous: different disk sizes, different numbers of cpus on each node) hadoop clusters automagically? I would consider diskless boot - but imagine that with a large cluster, getting the cluster up and running might be bottle-necked on the machine serving the OS. Or some form of distributed debian apt to keep the machines native environment synchronised? And how do people successfully manage the conf files over a number of (potentially heterogenous) machines? Thanks very much in advance, Alex

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• How to move mail accounts when migrating webhosting

  - by pkswatch

  I am migrating my website abc.com from one webhosting company to another in a shared hosting environment. Both have cpanel. And the second hosting account i am preparing to move is my multi-domain hosting account with 3 domains already in it. The problem is, i have many email accounts associated with my website abc.com, which are accessed using webmail. So if i move it to the other host, will i lose all those accounts and their emails? If yes, then how should i synchronise the email accounts so that all the accounts and the contained emails remain intact? I saw some several sync tools like IMAP Sync, etc. But these require two hosts while synchronizing, and as you see, i have just one domain name to be synchronized over 2 servers. PS, i do not have any ssh access on either of them, and i have made complete backup of all files using backup wizard in cpanel.

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• rsync --link-dest behaviour when run as sudo

  - by fotNelton

  In order to create regular backups, I'm using rsync together with --link-dest so as to create hard-links for unchanged files. For example: rsync -ax \ --partial --delete --delete-excluded --inplace \ --exclude-from=/tmp/temp_excludes \ --link-dest=/Volumes/Backup/current \ /Users /Volumes/Backup/2012-06-25 This works very well as long as I start the process from my normal user account. Though as soon as I start the process using sudo it behaves erradically, meaning that rsync copies all the unchanged files instead of hard-linking them. Since sudo modifies the environment, I've already also tried sudo -E in conjunction with making sure that my sudoers file has the corresponding option set. Well, that didn't work either. So, the question is, how can I run rsync using sudo? Whereas the above example only shows a backup of the Users directory, I also need to backup some system files that I can only access as root.

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• large RAID 10 vs small RAID1

  - by user116399

  The machine will store and serve millions of small files (<15Kb each), and all those files require a total storage space of 400G Considering the exact same SATA hard drives maker and models, on the exact same environment (OS, cpu, ram, raid controller, etc...) which one of the setups bellow would be faster? A) RAID 1 with 2 drives of 2T each, making up total storage of 2T B) RAID 10 with 4 drives of 2T each, making up total storage of 4T [EDIT]: I'm aware RAID10 is faster than RAID1. The larger the disk, at least in theory, the longer will take to do seeks/writes. So, will the performance gain of RAID10 will be outweighed by the "drag" caused the larger disk area when seek/write operations happened?

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• is there a GOTCHA - DBCC CHECKDB ('DBNAME', NOINDEX)?

  - by Deb Anderson

  I am turning on DBCC CHECKDB in our OLTP environment (SQL 2005,2008). System overhead is a very visible thing on our serversso I want them to be as efficient as it makes sense for them to be. HENCE - I want to turn on the NOINDEX option, an option I've never used before. My thoughts are these: if there is a problem with an index that is detected outside the integrity check, that I can just rebuild the index. Also the duration of the integrity checks will be drastically reduced, and the nastier corruption will be detected. What is the flaw in my plan? Thanks, Deb

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