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  • Virtual Box state not saving upon restart/reset/shutdown - reverting to an earlier state

    - by user638756
    Every time I restart/shut down my VM in VirtualBox (image is Ubuntu 10.02), whenever I start it back up, it reverts to the state it was in after I installed Guest Additions. This is extremely frustrating as every time I make progress on a project, whenever it restarts (mostly from crashing), I have to redo mostly everything. Is this a known problem with Guest Additions or with Virtual Box in general, and if so is there some solution?

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  • Cheat Sheets for System Administrators?

    - by splattne
    I'd like to start a collection of good, free cheat sheet resources for system administrators. Please add your favorite ones. From the Wikipedia "cheat sheet" article: In more general usage, a "cheat sheet" is any short (one or two page) reference to terms, commands, or symbols where the user is expected to understand the use of such terms etc but not necessarily to have memorized all of them.

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  • Linux box acting as wireless access point to share the internet connection

    - by Suresh
    A linux machine is connected to internet over two interfaces ppp0 and ppp1 using two modems. Also this machine acts as wireless access point through an interface say, eth0 with ip address 192.168.1.1 and acts as gateway for the connected devices through this network with subnet mask 255.255.255.0 Now is it possible to achieve the following: When any of the connected devices through wireless AP needs internet connection linux machine has to use ppp1 interface for internet. If any of the applications on the linux machine needs internet connection linux machine should use ppp0 interface for the internet. Can this be achieved by adding rules to chains in filter/nat tables? If the kernel routing table has a default rule to route the default traffic through interface ppp0, wil kernel completely ignore ppp1 for internet? PS: new to networking and routing concepts, If the question is not clear leave a comment, will try to give more information.

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  • Some Windows AD user property cannot be changed by AD user himself, what controls it?

    - by Jimm Chen
    I'm curious with a question I find. An Windows Active Directory user can change his own telephone number, street address etc, but can NOT change his own email-address registered on the AD. Using Python+pywin32 I can also verify this behavior. When trying to change own EmailAddress, I got error General access denied error . I'd like to know where in the AD this allow/deny behavior is defined. Thank you.

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  • Agile sysadmin and devops - How to accomplish?

    - by Marco Ramos
    Nowadays, agile systems adminitration and devops are some of the most trending topics regarding systems administration and operations. Both these concepts are mainly focused on bridging the gap between operations/sysadmins and the projects (developers, business, etc). Even if you never heard of the devops concept, I'm sure that this topic is your concern too. So, what tools and techniques do you use to accomplish devops in you companies? I'm particularly interested in topics like change management, continous integration and automatization, but not only. Please share your thoughts. I'm looking forward to read your answers/opinions :)

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  • Free-as-in-beer binary file format inspector

    - by fbrereto
    I am looking for a utility that gives me the ability to specify a binary file format and then interpret a file of bytes according to that format. (Something along the lines of the 010 Editor, but infinitely more cost-effective). Something that runs on Mac OS X would be preferred, but I'm interested to see what all is out there in general (while more of a hassle I'd be willing to run a tool on Windows if it were superior.) What's your preference?

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  • Migration from XP to Windows 7 using recovered HD

    - by KenK
    Is it possible to migrate the Windows XP Pro 32 bit operating system, applications etc from a USB external drive which is the recovered hard drive from that failed system to my new desktop computer with Windows7 64 bit system? In doing so, I would like to set up the new computer with the OS and all general applications on the primary 1TB hard drive while the secondary 1TB hard drive to have nothing else but graphics programs and gaming applications complete with their related files and add-ons. What will I need to accomplish this task efficiently and economically?

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  • What are the functionalities of Distributed File systems and Distributed Storage Systems?

    - by Berkay
    i'm reading cloud vendors solutions for the distributed storage systems such as Amazon Dynamo and Google Big Table. and really confused in two terms : what is Distrubuted file systems for in cloud ? what is Distributed storage systems for? what are differences of these terms and functionalities ? if i understand these terms i will create the general architecture of the cloud vendors, any good tutorial or web page will be appreciated. Thanks

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  • Starting/Stopping Custom PHP Chat Server Linux Service (CentOS)

    - by chad
    I have been trying all night to get this service working properly. I created this script from a template and am very new to bash coding. I wrote a fully functioning chat server in php which runs endlessly, but now want to make it a dedicated service. I want to do this so that it starts on server boot and boots back up if possible when there are any down-times with the server. The issue is that I need this thing to run in a detached screen so that I can monitor packet data or send server commands via SSH when need-be. The main problem that i'm having is that it needs to have its own PID when it starts so that I can stop/restart it when needed. I am the type who grinds on coding until I figure it out, but this is so new to me that it seems the learning curve here is very steep and frustrating. Below is my code if anybody can please help me with this one, i've gotten so tired I can't even concentrate any more :( #!/bin/sh # # chatserver # # chkconfig: 345 20 90 # description: chatServer Linux Service Daemon \ # for general server handling ### BEGIN INIT INFO # Provides: chatserver # Required-Start: $local_fs $network $named $syslog # Required-Stop: $local_fs $syslog # Default-Start: 3 4 5 # Default-Stop: 0 1 2 6 # Short-Description: This service maintains the chatServer # Description: chatServer Linux Service Daemon # for general server handling ### END INIT INFO # Source function library. . /etc/rc.d/init.d/functions exec="screen php -q /var/www/html/chatServer.php" prog="chatserver" config="/etc/sysconfig/$prog" pidfile="/var/run/chatserver.pid" [ -e /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog lockfile=/var/lock/subsys/$prog start() { #$exec || exit 5 echo -n $"Starting $prog: " daemon $exec --name=$exec --pidfile=$pidfile retval=$? echo [ $retval -eq 0 ] && touch $lockfile return $retval } stop() { echo -n $"Stopping $prog: " killproc -p $pidfile rm -f $pidfile retval=$? echo [ $retval -eq 0 ] && rm -f $lockfile return $retval } restart() { stop start } reload() { restart } force_reload() { restart } rh_status() { # run checks to determine if the service is running or use generic status status $prog } rh_status_q() { rh_status >/dev/null 2>&1 } case "$1" in start) rh_status_q && exit 0 $1 ;; stop) rh_status_q || exit 0 $1 ;; restart) $1 ;; reload) rh_status_q || exit 7 $1 ;; force-reload) force_reload ;; status) rh_status ;; condrestart|try-restart) rh_status_q || exit 0 restart ;; *) echo $"Usage: $0 {start|stop|status|restart|condrestart|try-restart|reload|force-reload}" exit 2 esac exit $?

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  • Amazon RDS Pros/Cons of Multiple DBs per instance

    - by Joe Flowers
    I run two completely independent websites. I am moving their MySQL databases to Amazon RDS. I'm not going to do Multi A/Z deployment - let's remove that variable from this question. I'm not sure whether to create a single RDS instance with two databases, or two Amazon RDS instances with a single database. Ignore cost for the sake of this question. I will not hit the 1 TB data limit so let's ignore that. However, it is extremely important that crashing one of the websites doesn't impact the other. Based on this document - http://docs.amazonwebservices.com/AmazonRDS/latest/UserGuide/Concepts.DBInstance.html I'm assuming that if I write terrible code that crashes one of the databases in a given RDS instance, it could possibly take down the entire RDS instance (and thus inadvertantly affect the other database). Is that correct? Thanks

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  • Static Routes and the Routing Table

    - by TheD
    This is very much a learning question if someone would be happy to explain a couple of concepts. My question is - the default routing table that exists in, in my case, a default Windows 7 install, what do each of the routes in the table do? Here is a screenshot: The 10.128.4.0 is just a route I've added while messing. I understand from a question I posted on Superuser the first route is just a default route that will route all traffic for any IP to my default gateway on my Interface in use. But what about the others? And how would the routing table handle a machine with multiple NIC's, perhaps connected to two different networks, or maybe even two NIC's on the same network so a VM can have a physical Network card instead of each VM sharing the hosts. Thanks!

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  • passing URL vars to a wordpress page and pretty-fying it with .htaccess

    - by Jonah
    I have wordpress installed in a directory called welcome, and /welcome/samples is a "page" (created via Wordpress). It's has a php template waiting for a $_REQUEST['category'] When a user goes to /welcome/samples/fun, I want to have "fun" passed to the samples php template in the form welcome/samples/?category=fun But I want the URL to remain in its original form - it's currently replacing the it with the ugly "?cat...etc" # Outside the wordpress block so it won't be overwritten Options +FollowSymlinks RewriteEngine On RewriteRule ^samples/([^/]+)$ /welcome/samples?cat=$1 [R,L] # BEGIN WordPress <IfModule mod_rewrite.c> RewriteEngine On RewriteBase /welcome/ RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule . /welcome/index.php [L] </IfModule> # END WordPress I tried Rewriting with simply samples?cat=$1 but I was getting a 404. I tried putting in the RewriteBase /welcome/ in the first block. without the [R] flag it doesn't work at all. I keep trying different permutations... and failing:( Perhaps I'm missing some basic concepts... thanks if you take the time to even read through this:) ciao

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  • Wine and Kernel Access

    - by Kyle Rozendo
    My knowledge on the topic is rather limited, but does one have Kernel access/the general ability to change programs at run time whilst running Wine? For Clarification: Can the user of the computer access any information they want via the Kernel on the underlying system running Wine, or does normal Windows security still apply?

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  • Script to monitor free space in Hdd

    - by s.mihai
    I have a server app that crushes when the HDD free space it's a multiple of 4Gb (on a Windows Server 2003). In general i keep track myself o that weekly since i use the machine from time to time. Can you point out an app or script (i don't wanna install powershell, is this doable???) that copies some larger files from one folder to another to get the free space out of the multiple of 4Gb range. Best regards, Mike

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  • I'm an emacs user. How do I learn vim?

    - by Jason Baker
    Most of the time, I use emacs. However, I've decided to try to learn vim. I'm happy with emacs, I just am trying to avoid having it turn into Maslow's Hammer. I've seen a few tutorials, but I have yet to see a good one written from the standpoint of someone coming from emacs. Is there any general advice that someone who's undergone this learning process before can give me? Most importantly, what are some concepts in Vim that may not be intuitive to me coming from an emacs background?

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  • Windows remote administration suite that doesn't rely on Active Directory, Domains, etc

    - by glasnt
    I know there are a number of suites out there that allow Windows machines on a Domain, or in Active Directory to be remotely administrated (windows updates, program installs, maintenance, etc); but does there exist a package that does this for non-AD/Domain setups? The kind of things I'm looking for: manage windows updates, + automatic applying custom package pushing (custom scripts, etc) general maintenance, visibily of health works for 2003/2008/2008R2 works without Active Directory or being part of a Domain (Might be able to manage putting all the machines on a Workgroup, if that helps)

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  • Tips for teaching Linux to beginners?

    - by chiborg
    I will teach Linux to people of the ages 20-75 with no prior Linux knowledge. I want to teach some basic concepts (what's an OS, what's a file system) and some practical knowlede: How to install it, network configuration, set up email client, installing software with a packet manager, etc. I have held a system administrators course in the past, but was under the impression that my method of teaching was not adequate. I've explained what I was about to show, showed students on the projector, told them to repeat it on their computers and summarized what they should have learned. They could ask questions all the time. But I fear they remembered only one-third of the knowledge I taught them. I have two questions here: Are there better methods to teach this particular subject in a classroom equipped with computers? Are there some tricks that "slow me down" when I teach stuff that I know inside-out?

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  • stsadm -o. What does the -o mean?

    - by ddono25
    I am working on a large SharePoint farm, mainly with the backend SQL Servers. We have always used stsadm -o for all stsadm functions, but no one seems to know why. I can't seem to find the info specific for stsadm, would it be general Windows command-line sytax?

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  • How do I share a Quick Style Set I have created?

    - by Frank Conte
    I have created a Quick Style Set in Word 2010 that I would like to share with colleagues. I have called this QSS OurReport. Another web site suggested the following For Windows 7, the folder should be Users[username]\AppData\Roaming\Microsoft\QuickStyles. Open Word File options advanced Scroll all the way down to section titled “General” Click “File locations” Click “User templates” – this will bring you to templates but also quick styles folder I have no Quick Styles Folder in my Roaming file locations

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  • Good text editor for OS-X?

    - by Cyrcle
    I'm considering getting a Mac. I want to make sure I'll be able to get a good text editor for it. I'm wondering what other folks are using. Features I need - Contextual highlighting for PHP, HTML, CSS, and preferably many others FTP from a hotkey - so I can hit ctrl-s to save, then another combo to FTP it. Features I'd like - Code Completion I'm also interested in any comments in general about coding on a Mac and if it's really worth the extra $$$ to get one. Thanks

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  • mobile broadband recommendations for Lenovo T500

    - by Justin Grant
    I use a Lenovo T500 primarily in and around San Francisco, although I do some travel in the US on business and occasionally to Europe/Asia. I'm looking for a good mobile broadband option for my T500. I am admittedly baffled by the various mobile-broadband choices (3G vs. 4G, WiMax vs. LTE vs. MIMO vs. ..., etc.). My priorities are (in this order): Compatible with Lenovo T500 and Windows 7. I realize only the AT&T accessory card is listed on Lenovo's site, but I've also heard that other cards will work in my T500 too, like the WiMax/Wifi combo card-- so I'm interested in what actually works, not necessarily only what Lenovo is promoting. Reliable coverage in US large cities, especially the SF Bay Area. my IPhone has lousy coverage in many spots, so I'd be nervous about an AT&T 3G option unless the problem is with the IPhone and not AT&T's network. I'm OK with non-great coverage outside major US cities, since I don't do much travel in those areas. Speed. faster is better. Internal card. I'd slightly prefer something I could install inside my T500 instead of a dongle on the side that might break off, although this is my lowest priority so it's not a big deal. Price. I don't want to pay over $100/month. I've tried lots of Googling and haven't come up with clear answers. I've seen lots of general overviews without recommendations, and lots of passionate opinions which don't feel objective (and don't help me understand compatibility with my hardware & geography). Can you recommend a good, objective guide online, ideally for Lenovo although general guide is OK too, which can help me figure out which option is the best one for me? I'd also be interested in your own personal experiences of using mobile broadband using a Lenovo T500. I'll accept the answer which gets me closest to making a decision.

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  • update samba on ubuntu 8.04ltr

    - by Crash893
    I have had a few problems getting windows 7 pc's to join my samba domain. The reason I've gathered is because the samba server software is outdated. What is involved in updating to the newest 3.5.x from the version that comes with 8.04ltr are there any pitfalls i should know about. what about very detailed instructions (I'm still learning Linux in general)

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