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• How to solve my black screen at boot?

  - by Juanillo

  I've got a friend with a weird problem. When he starts his computer the screen is completely black until the computer is completely started. So the screen is black until it suddenly shows the Windows desktop. He said that this is happening since a technical service repaired his computer, but that repair is not now in warranty. Recently the computer stopped working, but as the screen is black he cannot access to BIOS or start in safe mode (by pressing F8). When he inserts the Windows Vista DVD the system doesn't boot from DVD (it mustn't be configured in this way in the BIOS). Maybe there´s a problem with the hardware (maybe the graphic card)? Can anyone explain a reason why the screen is black during start-up? Any idea of what to do with the computer to restore it?

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• Source of Unexplained Requests in Server Logs

  - by Synetech inc.

  Hi, I am baffled by some entries in my server logs, specifically the web-server logs. Other than normal, expected traffic, I have noticed three types of request errors (eg 404, etc.): Broken links, ie links from old, external pages that point to pages that are no longer here Sequences of probes, ie some jerk trying to hack in by scanning my server for a series of exploitable admin type pages and such What appear to be completely random requests for things that have never existed on the server or even have anything to do with the server, and appear by themselves (ie not a series of requests like the probes) Could it somehow be a mistyped URL or IP? That’s about the only thing that I can think of, but still, how could I get a request on say, foobar.dyndns.org (12.34.56.78) for something like www.wantsfly.com/prx2.php or /MNG/LIVE or http://ant.dsabuse.com/abc.php?auth=45V456b09m&strPassword=X%5BMTR__CBZ%40VA&nLoginId=43. (Those are a few actual requests from my logs.) Can someone please explain scenario three to me? Thanks.

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• How to migrate exchange 2007 (sherweb) to Google Apps?

  - by Yoffe

  I need to migrate our Sherweb.com exchange 2007 services to a Google Apps account. For the process I am really not sure.. I understand I should start with creating aliases for all email accounts within the exchange server, in Google Apps, and here I'm not sure how am I supposed to explain the Exchange that the DNS have changed without losing emails.'' Second thing is: How can I safely move the up-to 3GB mailboxes from the Exchange server to the new Google Apps accounts? Must it be with Outlook data files? If so, how do I actually upload the data files into the Google Apps account? And if not, what would be a proper way to do so? Would really appreciate any kind of help.

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• Security when, ssh Private keys are lost

  - by Shree Mandadi

  Cant explain my problem enough with words, Let me take an example.. and please multiple the complexity by a 100 for the Solution. User-A has two ssh private keys, and over time has used this public key on a number of servers He lost one of them, and has created a new pair. How does User-A, inform me (Sys Admin), that he has lost his key, and How do I manage all the servers to which he had access to (I do not have a list, of all Servers that User-A has access to). In other words, How do I recall, the public key associated with this Private key. REF: In the LDAP based Authentication, All Servers would communicate with a single Server repository for Authentication, and If I remove acess or modify the password on the Server, all Systems that use this LDAP for Authentication are secured, when User-A loses his password..

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• perfmon reporting higher IOPs than possible?

  - by BlueToast

  We created a monitoring report for IOPs on performance counters using Disk reads/sec and Disk writes/sec on four servers (physical boxes, no virtualization) that have 4x 15k 146GB SAS drives in RAID10 per server, set to check and record data every 1 second, and logged for 24 hours before stopping reports. These are the results we got: Server1 Maximum disk reads/sec: 4249.437 Maximum disk writes/sec: 4178.946 Server2 Maximum disk reads/sec: 2550.140 Maximum disk writes/sec: 5177.821 Server3 Maximum disk reads/sec: 1903.300 Maximum disk writes/sec: 5299.036 Server4 Maximum disk reads/sec: 8453.572 Maximum disk writes/sec: 11584.653 The average disk reads and writes per second were generally low. I.e. for one particular server it was like average 33 writes/sec, but when monitoring in real-time it would often spike up to several hundreds and also sometimes into the thousands. Could someone explain to me why these numbers are significantly higher than theoretical calculations assuming each drive can do 180 IOPs? Additional details (RAID card): HP Smart Array P410i, Total cache size of 1GB, Write cache is disabled, Array accelerator cache ratio is 25% read and 75% write

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• Difference between ps output and top output?

  - by Soumya Prasad Ukil

  I find it difficult to understand the output produced by ps and top? This is the output by top: PID PSID USERNAME TID PRI NICE SIZE RES STATE TIME CPU COMMAND 26439 23712 soumyau 26439 15 0 7512M 5234M sleep 286:25 16.67% or_lse2 (18) 26523 23712 soumyau 26439 -2 0 7512M 5234M cpu9 143:10 8.33% or_lse2 26522 23712 soumyau 26439 -2 0 7512M 5234M cpu3 143:10 8.33% or_lse2 This is by ps (ps -L -p 26439 -o pcpu,psr,pid,user,tid): %CPU PSR PID USER TID 99.9 3 26439 soumyau 26522 99.9 9 26439 soumyau 26523 0.0 8 26439 soumyau 26439 Why are there differences in two result? Can you briefly explain the significance of the two CPU% ?

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• Is there a way to automatically disconnect a notebook from the eletrical power-supply?

  - by Diogo

  I know this looks like weird and useless, but let me explain... I'm running Windows Assessment and Deployment Kit (Windows ADK) to make some tests on Windows 8 Preview. One of it's assessment is the "Battery Run Down Test", which tests battery consumption with some procesor load. I'm trying to "automate" in some way this test, I mean, I wish to execute it without any human intervention (such as manually disconecting the eletric power source to leave my notebook running only from batteries to run this assessment). So, there is some ACPI API, Windows API or even an easy bat shell/VBScript/Powershell command to do this? Does someone already made something like? PS: I'm asking this because I couldn't found any answer, but maybe someone here would have any tip...

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• Mysql Master-ColdMaster

  - by enedebe

  I explain my case: I'm at Amazon AWS and I want to be fault tolerant on a entire region failure. My basic problem is to have the db in sync with 2 regions. My options: Master-Master (high lag) Hand made sync every 5 minutes Master-ColdMaster?! (copy on the fly but Master won't wait the other region commit) In my system we could afford loosing a piece of data (we're not a bank) the last inserts in the db, but we could not afford more than 10 minutes of downtime. The database is small and the level of inserts is low, and I wouldn't affect the normal usage waiting other region commit. Is the 3 solution posible? And the most important, once the primary fail how we can detect and change the rol between master-coldmaster -- coldmaster-master ? Is there any clean-mode to restore between failure? Thank's!

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• Significant OS X Finder lag when listing directories/files

  - by Jack Sleight

  I'm experiencing some significant OS X finder lag, that seems to be purely an issue with Finder itself, and not the HD or any other part of OS X (I'll explain below). The lag only appears to be when listing directories/files, where I'm seeing up to twelve or so seconds of lag (the folder opens with a blank list and the spinner going in the bottom right). This happens with both the local SSD and network drives (connected via ethernet or wifi) Browsing both local and network drives in terminal and listing directories is instant I can actually browse files on my NAS from my phone over a 3G connection from the other side of the country faster than Finder can when connected to the local network (madness!) Can anyone help? Thanks.

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• Any website/software where I can add some text rows on daily basis

  - by Moorage

  I have few notes or text like few remembering lines on daily or weekly basis. I want to write it. but i should be able to see at any backdate /monthly or yearly. The date-time should also be stored when i enter text. is it possible EDIT: I will explain clearly what i exactly want. Suppose while working on internet 1)i find "ABC is good for BCD". now i want to add that text to some online site where i can see later 2)Now i can add those type of things any time and on internet i can see that in tabular form like click to see montly list , yearly or weekly 3)Other thing is i should be able to add text as easy as possible like in firefox if i can press some shotcut and enter something and it gets added there rather than opening the site and then write The to do list do that sort of thing but they dont have creation date , rather they filter based on due date.

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• How can I figure out exactly which process is keeping my Mac from going to sleep and waking it up?

  - by pattern86

  I have read this knowledgebase article, but would like to know if there's a way to tell exactly which process is causing my Mac not to follow the sleep schedule I have set in System Preferences Energy Saver. I have narrowed it down to a being a process and will explain why I think so (see below). I am running OS X (10.6.5) on the new iMac 27" and I am certain it's not the following: The "Wake for Network Access" checkbox in Energy Saver settings (has never been a previous issue) Peripherals (has never been a previous issue) Any active GUI application (all are closed) Additional USB/FireWire drives (none are connected) Bluetooth (it's off) Sharing services (has never been a previous issue) The symptoms are as follows: The computer doesn't go to sleep at the predetermined time. It will wake up some number of hours after being put manually to sleep (but not within the first few seconds/minutes.) Is there a specific string I should be looking for in Console? I have tried searching for "wake" and "sleep" but can't make total sense of the results.

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• Questions about Domains and DNS

  - by ShoX

  Hi, I am totally new to the DNS and server hosting world and not quite sure what I need. I want to get a domain, forward it to my own server, so that the user sees example.com in the url bar and example.com/foo/bar will work. Depending on what subdomain it is, it should do different things (another base-directory at webserver, ftp, etc). Also my email should be able to be sent to and received by that server. What irritates me, is the fact, that in the A-record I can only list IP-addresses and no ports. So do I have to set up a nameserver on my own server? Or do I accomplish this via vhosts on my webserver? I would appreciate any help or link to a tutorial. I know how DNS works, know some basic apache-stuff, etc... so no need to explain that. Thanks

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• Daily Weekly and Monthly DB backup with logrotate?

  - by benjisail

  I am currently keeping daily backup of my database by doing a daily mysqldump and by using logrotate to keep the 7 last days of mysqldump. I would like to improve this backup process to keep 7 daily backup, 3 weekly backups and 12 monthly backup. I found this article which explain how to di this with logrotate : http://www.hotcoding.com/os/sysadmin/35751.html However I am using the dateext logrotate option to name my backup files so I cannot use this solution. How can I do daily, weekly and monthly backup with logrotate and with the dateext option?

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• Exchange 2007 backup / restore

  - by Matt

  To explain my situation I have a exchange 2007 server and I have recently upgraded to SP2 so that I can use windows server backup to take an "exchange aware" backup of the server. Is there an easy way of restoring this data onto a second server to which I have pre-installed server 2008 / exchange 2007 without upsetting my current exchange server set-up. Also is there a better way to do this, such as running one as a fall over should the primary exchange server develop a fault. I am still new to all this so please excuse any stupidity in my questions. Thanks in advance for any help and assistance

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• How to manage a home-grown YUM package repo?

  - by TomOnTime

  There are plenty of websites that explain how to manage a mirror of YUM repos. I want to run a repo for my home-grown packages. Is there a good way to manage such repos? What I need to do: Manage 3 repos: unstable, testing, stable Self-service functions that let users add/remove/promote packages (promote means moving a package unstable?testing or testing-stable). ACLs that control which users/groups may add/remove/promote packages. Automatically re-sign packages as they move repo to repo (since the GPG key for "stable" should be different than "unstable") Automatically run "createrepo" to update repodata when needed. Suggestions?

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• Memory management (segmentation and paging) in 80286 and 80386: How does it work?

  - by Andrew J. Brehm

  I found lots of Web sites and books explaining how memory management worked on the 8086 and later x86 CPUs in Real Mode. I understand, I think, how two 16 bit values, segment address and offset are combined to get a linear 20 bit physical address (shift segment four bits to the left, add offset; segments are 64K and start every 16 bytes). But I couldn't find any good Web sites or books that explained how memory management works in Protected Mode, specifically the differences between 80286 and 80386. Can anyone point me to a good Web site or book (or explain it right here)? (For extra credit, i.e. an upvote, how does it work in Long Mode?)

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• On Mac OS X how can I monitor what is using my internet connection?

  - by Jon Hopkins

  I've got a relatively limited broadband connection (I live miles from the nearest exchange) and from time to time net access (but nothing else) slows to a near crawl. I know from a bit of monitoring software that the connection is being fairly heavily used which would explain it but I don't know what's using it. There are certainly plenty of things which might (these days there are dozens of apps that will either regularly or infrequently check data or download updates) but how can I find out? I'm happy to pay (a small amount of) money if needed, though in that case I'd rather it were a recommendation that me just Googling for something.

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• Apache2 server does not start cannot pen shared object file

  - by sid__

  I am working with Apache and Passenger for a Rails project. And a during a restart I got the following error Cannot load /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11/ext/apache2/mod_passenger.so into server: /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11/ext/apache2/mod_passenger.so: cannot open shared object file: No such file or directory However there is no change in the apache configuration file. I have attached the snippet from the conf file 287 LoadModule passenger_module /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11/ext/apache2/mod_passenger.so 288 PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-2.2.11 289 PassengerRuby /usr/bin/ruby1.8 I am also unable to locate the shared object file in the location pointed to by the server though I am not really sure how the .so file is works (created/destroyed) I would also appreciate it if someone could explain to me what exactly has happened. I understand the shared object file is mission, what could be the reason it got deleted.

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• Files turned into folders on external hard drive

  - by Kashif

  I have a networked hard drive where I like to store audio/video/software and all sorts of other files for my house. While the software files are all intact and working, many of my video and audio files have been turned into folders! Can anyone explain why this is happening, how I can prevent it, and if it is possible to revert these "folders" back into files. Thanks much! An example of what the folders are named: "Highschool Graduation.avi", "Birthday party.avi", "Somesong.mp3" The HDD is connected to a Linksys E4200 router (Firmware Version: 2.0.37). This is how the HDD is networked.

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• Access permission /opt/ in Ubuntu

  - by user1201239

  I want to access my /opt/ folder I have found following commands for giving access permission. But not sure what is the purpose of this commands which one is the better to use it to maintain security and access permission both. Please explain me the purpose or what this different numbers means in security permission ? here are they , sudo chmod 755 -R /opt/ sudo chmod 755 /opt/ sudo chmod 775 /opt/ sudo chmod 777 /opt/ I dint know these commands so what I use to do previously was "gksudo nautilius" then rightclick- change the owner from root to current usergroup But now as I have found this commands I would like to know Which one should i use ? and what they do ?

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• Cannot increase my screen resolution

  - by Patrick Beardmore

  I am trying to install my new monitor but my Graphics Adapter (Mobile Intel(R) 915GM/GMS,910GML Express Chipset Family) does not offer a resolution of 1920x1080 in the [Display Properties Settings] window. It only offers up to 1360x768. Can anyone explain to me how I can increase this number to the correct resolution. The monitor does show my the windows desktop, albeit at a lower resolution which is being stretched to fill the screen, making it look very blurry. I have installed the "Monitor Drivers" I found on the disk supplied with new monitor, but these do not appear to have made any difference. The Intel software that comes with the graphics card has an information window containing lots of info about the card and the monitor itself. I have placed this on a webpage so you can examine it if helpful. Many thanks with your help in getting my Christmas present to work! Patrick P.S.: Before I got this screen I checked to see if my graphics card could cope with such a large screen.

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• replace set of integers with respective string values

  - by Tripz

  I have a query which return the output like -- 5,4,6 Where 1 = apple, 2 = mango, 3 = banana, 4 = plum, 5 = cherry, 6 = kiwi etc. I would like to update my output as cherry,plum,kiwi instead of 5,4,6 How can I achieve that in the same select statment. I am okay to hard code the values. Please confirm May be I did explain clearly Here is the sample SELECT fruits FROM t_fruitid where id = 7 is returning me '5,6,4' as a single row Now I want to update this single row output as 'cherry,plum,kiwi' How do I do this Thanku

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• Session Variables lost between pages reloads

  - by Android Addict

  I was forced to move to IIS 7 when the server running our IIS 6 died. Nothing in the web app has changed, but it's obvious the environment has dramatically. The app fails between pages because the session variables are lost during redirect. I am not an expert on app pools but my impression from reading several posts is that the app pool is being recycled immediately. While they give a reason, they offer no help in how to resolve this. Can someone explain to a newb how to properly configure the DefaultAppPool?

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• Recommend a mail server setup for multiple domains

  - by Greg

  Hi all, I've just set up a new Debian web server which I have done plenty of times before, but I want to add a mail server which I have never done before. I am aware of this question, but I would like someone to recommend packages and briefly explain how to use them for providing pop/imap access on multiple domains, a concept that has confused me for a while. I'm planning for this server to grow slowly but surely, from serving an initial 5 or 6 domains to about 20 in the first year, continuing at this rate. (yes, I've jumped on the cloud bandwaggon). At the moment, I have a DNS-A record pointing to my server's IP and nothing else. I'm assuming that I need a DNS-MX record pointing there too, but I haven't read up about it yet so today that's what I'll be doing. Hopefully reading up on the subject and the help that I get here will get my server up and running in no time. Thanks!

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• Exporting a VM running as a Domain Controller

  - by AndyM

  There is a Microsoft KB article that talks about best practices for running a DC on a VM. One of the notes is "Do not use the Export feature on a virtual machine that is running a domain controller". In order to export a VM, the VM needs to be turned off. If you turn off a DC VM, export it, import it on another server and then power the VM back on, there should be no risk as long as the original (exported) VM is never powered back on. Can someone explain to me why this isn't supported? After doing some searching on Google, the sites I found just regurgitated this line from the KB article, but didn't offer any explanation as to why this isn't supported.

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