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• master-slave-slave replication: master will become bottleneck for writes

  - by JMW

  hi, the mysql database has arround 2TB of data. i have a master-slave-slave replication running. the application that uses the database does read (SELECT) queries just on one of the 2 slaves and write (DELETE/INSERT/UPDATE) queries on the master. the application does way more reads, than writes. if we have a problem with the read (SELECT) queries, we can just add another slave database and tell the application, that there is another salve. so it scales well... Currently, the master is running arround 40% disk io due to the writes. So i'm thinking about how to scale the the database in the future. Because one day the master will be overloaded. What could be a solution there? maybe mysql cluster? if so, are there any pitfalls or limitations in switching the database to ndb? thanks a lot in advance... :)

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• Setup a automatic server reboot on when a particular service fails

  - by user1179459

  I am running linux based server (centos 6.0) with cpanle and WHM, I have critical website running with a chat server which uses a openfire as the chat server backend server, i have monitored last few weeks this service crashes quite often, i have no way of knowing that, and i have to wait till the next day to restart the server. (and this can only be fixed by using server reboot as its got to do with some java memory problem) is there a way i can setup a monitoring service to the server and if this service goes down server itself will reboot ? is this something possible or is there a better way to overcome this problem ?

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• Odd domain switching behavior in Firefox and Chrome

  - by Jeremy Detrempe

  We have different development severs and a production server. Testing is done in the development servers. As a QA engineer, I'm switching between these servers quite often throughout the day. In Chrome, sometimes I need to reload a page a few times to get it to pull from the newly switched server. In Firefox, sometimes I need to quit the browser in order to get it to pull from the newly switched server. (We have small tags that indicate which server you are pulling from, which is how I know in-browser.) Why does that happen? I'd love to know how that happens (maybe what it's called?) and what the best way to deal with it is. (I know that Firefox has an extension for domain switching; is that the best solution?)

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• automating sql express backup via VSS backup

  - by Ornus

  I need to set up on my server automated daily SQL db backups (sql express, so no maintenance plans). To keep things simple I'm gonna use a backup solution (JungleDisk) that uses VSS to back up the DB file. SQL fully supports VSS and on requests freezes DB I/O, so I understand I'm taking snapshots. JungleDisk supports doing differential back up and compression, so it simplifies things and keeps the cost/bandwidth down. Is it enough to just backup up db file (mdf). Do I need to back up transaction log (ldf) file as well? I'm ok with losing a day's worth of work (since the last backup). if I go this route, what's the best way to restore the database? are there any issues with this approach I'm not aware of?

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• Identify Long Running or Slow PHP Scripts

  - by Kirk

  I have web server that is getting around 25K visits a day up at yougetsignal.com. Sometimes the site feels a bit sluggish. I am hosting it on nginx with php5-fpm. Is there a way for me to see a list of all of the long running requests that are coming to the site? I'd love to have a real-time list of all of the active requests that PHP is handling and how long they have been running. Kind of like top, but just for the web server. This would let me know how long requests are taking and which script is the culprit. Anyone have any ideas on how I can do this?

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• How Can I Override the Remote Administrator security policy on Android 2.2 so that I can disable the lock screen?

  - by hagope

  On Android 2.2 Froyo, I added my Corporate exchange email account to the phone, however, the security policy set by the "remote administer" requires that I enter a 4-digit PIN at the lock screen and a maximum 10sec idle. How can I hack my Android, through root access or otherwise, such that I do not need to follow this security policy. I am very annoyed at having to enter the PIN every time I want to use the phone, because I open/close it so often through out the day? Please help...I'm so surprised at how difficult it is to find the answer!

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• SQL Server 2008 Registration with Product Key

  - by Kanini

  A colleague of mine gave me the SQL Server 2008 Standard ISO image and I used that while building a Virtual Machine. Now, when I installed SQL Server with that above mentioned ISO, I did not give it a key and I chose Enterprise Evaluation. So, the instance has now been activated with 180-day expiration. I do have a valid MSDN Subscriber login but when I login and search for SQL Server 2008 it comes up with the download but says No Product Key is required. How do I now enter the product key?

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• Demoted domain controller and now IIS has permissions issues

  - by tladuke

  I have a machine that was a domain controller and everything else, includin an IIS site. I built new 2 new domain controllers and transferred the FSMO roles and waited a day and then demoted the original domain controller. Now the IIS site says : HTTP Error 401.2 - Unauthorized You are not authorized to view this page due to invalid authentication headers. I have a call in with the web app vendor, but maybe someone can guess what I need to fix now. I haven't looked at IIS since this was installed and am pretty lost. I thought about restoring the machine from a backup, but I think that would be an Active Directory disaster, right? The server is Windows 2008 (not R2). The new DCs are 2008 R2

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• Putty freezes at random when logging into a remote machine in another continent

  - by vito

  I have to ssh to a remote machine in Europe from Asia every day for my work. But Putty freezes sometimes at totally random times and I have no choice but to close and re-open a new ssh session. It's frustrating especially when I'm editing something or executing a long running program. I know the question really doesn't have much details ('cause nothing seems to be wrong with the network at all). Has anyone experienced this sort of issue with Putty and had resolved it? Thanks for your time!

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• ubuntu to ubuntu backup in internal network

  - by amirash

  hey, i got my development "home" server witch is ubuntu 10, i brought today a computer in order to make a backup to this computer (the development server does also to him self backups every day but im paranoaid so i want to have two backups just in case on diffrent computers) what is the best way to backup the system core of the development server (like norton ghost) & do a full & incrmnt backup of him to the new computer that ive brought? rsync? rdiff? scp? clonezilla?

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• Browser extension (or other software) to delay page load

  - by Doug Harris

  The alt text to today's comic at xkcd.com (strip below) says: After years of trying, I broke this habit in a day by decoupling the action and the neurological reward. I set up a simple 30-second delay I had to wait through, in which I couldn't do anything else, before any new page or chat client would load (and only allowed one to run at once). The urge to check all those sites magically vanished--and my 'productive' computer use was unaffected. (bold is my emphasis) Does anybody know of a browser extension or other software that will add this sort of delay? I've seen extensions which simply block sites, but not a delay like this.

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• Looking for event management application

  - by taudep

  Hello, I'm looking for a web-based event management application for managing events (or activities) on certain days that I setup. And then I want people to be able to sign up for them. I'm looking for something that can then be embedded in my website, similar to a Google Calendar. Then for a given event's day, I can click on it, see who's attending. Ideally, I wouldn't have to invite people to the event, but they can just sign up for it. I'm not looking to use something like Evite. This application is going to be used to manage a schedule of bike races, and who from my club will sign up for them. Thanks for any suggestions.

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• Is there a Windows 7 equivalent to the *NIX ability to create a hard link to /dev/null?

  - by minameismud

  I saw another question here that the Windows equivalent to /dev/null is simply NUL. I also know that you can use the mklink command to make sym links (shortcuts) from the command line: MKLINK [[/D] | [/H] | [/J]] Link Target /D Creates a directory symbolic link. Default is a file symbolic link. /H Creates a hard link instead of a symbolic link. /J Creates a Directory Junction. Link specifies the new symbolic link name. Target specifies the path (relative or absolute) that the new link refers to. When I try to use the /j switch to make a hard link ("junction") instead of a simple shortcut to NUL, I get: C:\>mklink /j "C:\Program Files\MyNewHardlinkFolder" NUL Local volumes are required to complete the operation. I can create shortcuts to NUL all day long using the /d switch, but I would much prefer the hard link. Any ideas?

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• Troubleshoot odd large transaction log backups...

  - by Tim

  I have a SQL Server 2005 SP2 system with a single database that is 42gigs in size. It is a modestly active database that sees on average 25 transactions per second. The database is configured in Full recovery model and we perform transaction log backups every hour. However it seems to be pretty random at some point during the day the log backup will go from it's average size of 15megs all the way up to 40gigs. There are only 4 jobs that are scheduled to run on the SQL server and they are all typical backup jobs which occur on a daily/weekly basis. I'm not entirely sure of what client activity takes place as the application servers are maintained by a different department. Is there any good way to track down the cause of these log file growths and pinpoint them to a particular application, or client? Thanks in advance.

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• I want to version control my entire slice

  - by Tom

  I'm renting a slice (i.e., a VPS) from Slicehost. I've a spent a day or two filling up /usr with my favorite packages, /etc with configs and init scripts, and so on. Now I want to: save this whole setup somewhere (e.g., to load onto another machine). see what changes I've made to which files revert changes, tag revisions, and all that other good version control stuff Saving a disk image gives me (1), but not (2) and (3). Using Subversion (svn import / svn://someotherhost) might give me all three, but I expect problems if I actually try to check a project out into / and maintain .svn directories in root-owned areas. And to load my setup onto a fresh slice, I'd need to install an svn client on it first. Is there a good way to do what I want to do?

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• SCSI vs SATA? Is SCSI "actually" better?

  - by earlz

  Well, I was talking with a guy about servers the other day. I was a bit shocked whenever I asked him if there was any significant difference between SCSI and SATA and why he always uses SCSI. (note, I'm not sure if by SCSI he meant SAS) He told me that SCSI is always faster and that the drives are always more reliable.. I mean, this seems like a bold statement. He told me something about how SCSI will always be faster than SATA because the OS sends the SCSI (controller?) a request to get a file and it will build the file inside of the SCSI controller, instead of searching all over the disk.. which I do not understand how that would work, so I figure it is BS. SAS and SATA currently have equivalent data rate speeds.. Is there any true backing for his reasoning that SCSI is always faster and more reliable than SATA?

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• Windows 7 just corrupted Microsoft F# and now won't fix itself.

  - by user225626

  I lost half a year's worth of custom CGAL/GMP/LEDA/Qt3/Qt4/MPFR/MPFI/Visual Studio/Boost/blahblahblah open source nonsense with DLLs that are scattered in various parts of the OS that I had gotten to finally work. All because F#, which came with .NET 4 and which I never, ever used, is now "corrupted" one day for reasons only Windows 7 knows, and now Windows 7 won't even boot. Of course none--none--of the above setup works as accessed from the USB port. How do I remove a corrupted file that prevents a Windows 7 from booting, or even being fixed by an external CD mount of the Windows 7? Thanks for any help.

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• Equivalent of LogRotate for Windows?

  - by mfinni

  We have a huge logfile being written by a vendor's application. Let's assume the vendor won't do anything that we ask. Is there any way of rotating that logfile somehow? We're looking at about 300 MB an hour being written - I'd much rather chunk that into 10 MB pieces, and let anything older than a day or over 1000 files fall off a cliff. (I know I know, possible duplicate of How do you rotate apache logs on windows without interrupting service? ) Aha - the Chomp log was dead, but searching for "chomp logrotate brought me to it's new site. I'll give it a try tomorrow and reply if I like it. I'd still like to hear about software anyone else is using that works for this.

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• FTP script download from linux to windows

  - by user53864

  I'm using following FTP script on windows xp to download zip files from ubuntu cloud servers. A zip file is created every day on ubutnu servers and I will download it to windows via this ftp script. I run this script everyday manually as I have to edit the last line(mget /usr/backup_02-11-2010.Zip) of the script to match today's date. I want to edit this script so that it will download only today's zip file at the scheduled time without needing to edit it everyday, when scheduled. It's clear that date is appended to the zip files and is in the format dd-mm-yyyy. Need help... open server-ip-here username-here user-password-here lcd C:\Backup\files bin hash prompt mget /usr/backup_02-11-2010.zip

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• What is the simplest and fastest way to transfer large file through a Windows network?

  - by Sake

  I have a Window Server 2000 machine running MS SQL Server that stores over 20GB of data. The database is backed-up every day to the second harddrive. I want to transfer those backup files to another computer to build another test server and for recovery practicing. (the backup never actually got restored for almost 5 years. Don't tell my boss about that!) I have trouble transfering that huge file through the network. I've tried plain network copy, apache download, and ftp. Any method I tried end up failing when the amount of data transfered reach 2GB. The last time that I successfully transfered the file, it was through a usb attached external harddrive. But I want to perform this task routinely and preferably automatically. Wonder what is the most pragmatic approach for this situation ?

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• Webserver: Performance impact when storing session files on /dev/shm

  - by GetFree

  I have a website runing on a typical setup: Linux, Apache, PHP, MySQL. However, what's not typical about it, is that it's getting tons of traffic (400,000+ visits a day) and so, efficiency is becoming more and more important to me. I'm constantly looking for things I could optimize and, right now, my attention is focused on PHP's session files. There's a hell lot of session files constantly being read and created on the /tmp directory. So my question is: Is it a good idea to store the session files in /dev/shm (tmpfs) in order to speed things up a little bit??

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• Configure Postfix for outgoing mail

  - by Savvas Sopiadis

  I have the following scenario i must implement using Postfix (but don't know how to begin): Say we have a domain aaa.com which is hosted somewhere (this is already functioning without any problems). On this envirnoment there is already a Mail server though which we can send and receive mail (this mail server is limiting us to a very small number of emails/day). Now we have setup a VPS (virtual private server) on which we installed Postfix, which sole porpuse is to send emails on behalf of domain aaa.com. The Postfix server will be used by a program like Outlook to send the email. What configuration has to be done? (i 'm a bloody beginner in this field!) Thanks in advance

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• How does Exchange 2010 prevent auto-reply loop?

  - by Beaming Mel-Bin

  E.g., 2 users have auto-reply configured. User A sends a message to User B. User B's auto-reply gets sent to User A's mailbox. That, in turn, causes an auto-reply to be sent from User A and insanity ensues. How does Exchange 2010 prevent this scenario? Also, can Exchange 2010 prevent a user's mailbox sending more than one auto-reply to the same user in one day? Bonus: Assuming Exchange prevents this, how do I configure the settings?

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• Upgrading from MySQL Server to MariaDB

  - by Korrupzion

  I've heard that MariaDB has better performance than MySQL-Server. I'm running software that makes an intensive use of MySQL, thats why I want to try upgrading to MariaDB. Please tell me your experiences doing this conversion, and instructions or tips. Also, which files I should take care of for making a backup of MySQL-Server, so if something goes wrong with MariaDB, I could rollback to MySQL without issues? I would use this but i'm not sure if it's enough to get a full backup of MySQL-Server confs and databases mysqldump --all-databases backup /etc/mysql My Environment: uname -a (Debian Lenny) Linux charizard 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64 GNU/Linux MySQL Server Version: Server version 5.0.51a-24+lenny4 MySQL Client: 5.0.51a Statistics: Threads: 25 Questions: 14690861 Slow queries: 9 Opens: 21428 Flush tables: 1 Open tables: 128 Queries per second avg: 162.666 Uptime: 1 day 1 hour 5 min 13 sec Thanks! PS: Rate my english :D

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• MySql calculate number of connections needed

  - by Udi I

  I am trying to figure my needs regarding web service hosting. After trying Azure I have realized that the default MySql they provide (through a third party) limits the account to 4 connections. You can then upgrade the account to 15, 30 or 40 connections (which is quite expensive). Their 15 connections plan is descirbed as: "Excellent choice for light test and staging apps that need a reliable MySQL database". I have 2 questions: if my application is a web service which needs to preform ~120k Queries a day (Normal/BELL distribution) and each query is ~150ms(duration)/~400ms(fetch), how many connection do I need? If instead of using cloud computing, I will choose a VPS, how many connections will I be able to handle on a 1GB 2 cores VPS? Thank you!

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