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• Amazon EC2- many micro-instances vs single small/medium instance

  - by shashankaholic

  I have a chat application using stack of Openfire, Tomcat6 and MySQL. Currently, i have installed all these servers on single Linux micro-instance(613 MB memory). Even in low user base 10-20 i am encountering CPU overload which is quite obvious here. As, i am new to Amazon EC2 can somebody suggest me how to scale up my architecture according to traffic use? should i use separate micro instances for every app server(openfire,mysql,tomcat6) should i use single small or medium instance for whole server stack. Some factors in context: high reliance on MYSQL high memory usage due to file transfer web-application interacting with other Amazon service like S3,SES

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• Can I turn a 2D image into something like a ribbon without 3D Tools?

  - by Michael Stum

  I have a picture that's very long and not very tall. I want to create a graphic like the one below, but with my picture as the "texture". Can Photoshop do something like that? I'd like to avoid to spin up a 3D Program because then I need to render it, get the image out of it and into Photoshop. They seem to have added 3D Functionality into CS5, I just never looked at it. Obvious question after that: What would the backside look like? Are there other applications that can do something like that in a simple way?

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• cat contents of one file into another file

  - by Attila O.

  I have a large (binary) file that has some corruption near the beginning. Then, I have a second, smaller file that I obtain by starting to download the same file again, but interrupt after I have enough bytes to fix the original one. My question is, how do I simply overwrite the beginning of the large file with the contents of the second, smaller file? I could use cat, tail and head, but that would create a copy of the file. There must be a more efficient way. Oh yes, and I'm looking for a linux command-line solution, if that wasn't obvious. I'm using bash, but I have other shells if that helps.

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• Testing performance from around the world - how do I get a linux shell easily in multiple countries?

  - by Matthew O'Riordan

  We are building a socket based service where latency is paramount, and as such we have servers distributed into 7 data centres around the world. However, whilst we know we're bringing the servers closer to the clients, it's very difficult to know how effective this is, and importantly, what difference this makes compared to our competitors. As such, we want to run simple scripts that test latency and throughput for both our service and our competitors, which is easy enough using Amazon, however Amazon only have 7 data centres. We would like to know for example how we perform in locations all over the world such as South Africa, Australia, China, Peru etc. Does anyone know of any service where we could piggy back off their global infrastructure and run some scripts to test this performance? The obvious contenders are people like Monitis, but I don't think they would allow us to run custom scripts, only standard protocol monitors. Thanks for your help. Matt

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• How to copy/paste LARGE amounts of text in Windows

  - by Johnson

  I am not sure if this is more suited for Superuser or Stackoverflow, but here goes... A little bit of background: I'm learning SQL and was trying to make a very large table which I could use for optimization tests. Something generic with random values. I created a little Java program to do just that, and was able to put out a text file with 100,000 lines, each line being an SQL INSERT statement for a new random record. However, with anything much bigger than 100,000 lines, I had problems either opening/using the text file in any text editor, or copying/pasting the text to the windows clipboard and then into SQL Developer so I could execute it as a script. I'm probably overlooking something really obvious, or doing something really stupid. There has got to be a better way to do this, but I couldn't find anything through Google or Stackoverflow or Superuser. Thanks!

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• Desktop stops working in Windows 7

  - by Roger

  I'm having an odd problem on one of my Windows 7 machines. At machine startup, explorer.exe is working properly - I can use the Start menu, click on desktop icons, etc. At some later point, though, I lose the ability to interact with desktop icons. I can't double-click to open files on the desktop, and I can't right-click to see the properties window. Oddly enough the Start menu still works properly, and I can still open an Explorer window into my desktop and access everything. I can get around the problem by killing explorer.exe and restarting it using Task Manager, but it's annoying to have to do this over and over. Does anyone have any ideas? I took a look at startup files with msconfig and didn't see any obvious problems. Any suggestions would be appreciated.

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• Benefits of log rotation

  - by Manfred Moser

  I have been using logrotation for years and never thought too much of it being a problem until I came across a question on stackoverflow (http://stackoverflow.com/questions/1508734/disable-java-log-rotation/) where someone wants to disable log rotation. To me with experience in having build server and even production servers cleaned up manually because logs are not rotated and discs are running out and suddenly machines come to a halt that all seems crazy, but it occurred to me that maybe it is not so obvious after all. So what are the benefits of log rotation? And what are the drawbacks (e.g. more difficult to debug/analyze maybe)? What tools do you find useful for working with rotated log files? Splunk I assume, but what else?

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• Server speed: sharing one script.php or using many copies the same script.php

  - by Marco Demaio

  Let's assume: I have thousands of domains on same Apache server. Each domain is in a folder under server public_html document folder, so it can be accessed by calling "www.somedomain.com" or by calling "www.serverdomain.com/somedomain_folder" In each domain there is a website who needs a certain script.php (identical for each domain). From a coding point view, its obvious that it's better to use a unique script.php, so when i update it with new features/bug fixes etc, I need to update on server only one file and it will work for all domains. But from a server point of view? If i use a unique script all domains will access it at the same time, will the server run slower compared to the situation where each domain called its own script?

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• Editing a sublime theme, how to know which key string corresponds to which text element in the code?

  - by laggingreflex

  I want to customize the color scheme of the comments in my code, by editing the .tmTheme How to know which of the <dict> <key> corresponds to which element of the code? Like, I can guess some of them but not every one of them is that obvious.. I remember there was some mouse click or a keyboard shortcut that when you hover over something in your code and click/press it it would show exactly the key you need to edit in the status bar. Something like this How do I do that?

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• How best to integrate PPA into Debian?

  - by eicos

  I'm working with ZFS on Linux, on my Debian squeeze server. I've found a useful package in an Ubuntu PPA, apparently by one of the ZoL developers, and I would like to integrate it into my package system. However, I am really having a terrible time doing this. It seems like it would be possible if I upgraded my system to the testing branch, but I'd prefer not to do this for obvious reasons. So, what is the One True Way to do this? Or, what is a passable way to do this, i.e. one that does not involve an ice nine-like assimilation of my entire system to testing branch? Edit: Silly question. I clicked the little green "technical information about this package" on launchpad and all was revealed.

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• Free alternatives to vSphere for ESXi (if one exists)

  - by Tim

  Dear All, Am feeling a touch confused and overwhemled. From what I gather even though ESXi is free I will only be able to manage my VMs (create or power on etc) for 60 days unless I buy a licence for vSphere. This is somewhat frustrating. As I am looking for a home lab to practice for various certs I was hoping to also practice using vmware stuff to do so. Have I got the wrong end of the stick? Is there a free built in web interface like there was with VMServer or is the only option vSphere (which is massively out of my price range)? Looking forward to your responses and hoping that I have just missed something obvious! Regards Tim

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• Can I do an overwrite install of Windows 7 without losing all my apps and data?

  - by Brian Dougan

  My local computer technician installed his store's copy of Window's 7 Premium on my computer. I had been using Window's Vista; but needed the XP component of "7" As part of the price I paid; I have a fully licensed, unopened "7" disc; with all of the drivers included. The technician warned me about the "nag" screen; that asks me to install my licensed copy at any time. Without thinking; I downloaded all of my usual software programs before installing the licensed copy. Here is my question: I hope this won't sound obvious: Will it overwrite my downloads?

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• How do I pick a motherboard?

  - by EpsilonVector

  When building your own computer one part was always a mystery to me: the motherboard. Picking a CPU/GPU/memory is easy- you just figure out where the various chips are in the low end to high end scale, do a little market research on what current games demand, and pick the parts from their respective continuums of low-to-high-end models. A mother board is more complicated though. Its features are not as obvious as "this motherboard is faster than that motherboard". Now you need to deal with part compatibilities, bus speeds, maybe power management stuff, etc. I'm interested in a short guide for selecting a motherboard, especially- what pitfalls to avoid (for example, can bus speed become a bottleneck?). To clarify: I'm not looking for motherboard recommendations. I'm looking for guidance regarding how to evaluate the fitness of a motherboard given the rest of the computer parts.

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• Internet problems

  - by dan

  I've got problems on my freshly installed windows Xp machine. I cannot connect to the internet and I've tried various 'solutions' provided to me by the help and support center. Surprisingly none of them worked... Anyways, I've got 3 pc's next to me sharing a lan which is connected to the internet though a modem. The computer I use right now uses windows xp aswell and runs without any problems. I've tried everything on not working computer. I've ran the connection wizard several times, but it's not working :( Also I've very little experience with this version of windows, so I'm sorry if the solution is obvious.

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• Fixing Outlook 2010's notorious 'Disabled Search Indexer' Add-in problem

  - by Muhimbi

  I have been impressed with the improvements in search introduced in Outlook 2010. Unfortunately, in the last week search has stopped working for me. I have tried all the obvious repair tasks such as repairing office, disabling all add-ins, rebuilding the index, compacting the PST, but no luck. It appears that 'mssphtb.dll' (Used by search) keeps crashing and as a result Outlook Disables it. I have tried re-enabling it, but Outlook immediately disables it again. I have had a look in the Windows Event Log as well, but Outlook does not appear to log any errors that occur when loading add-ins. A lot of people appear to have the same problem, but no fixes so far. I am considering installing Xobni, but I prefer to make Outlook work the way it is supposed to and not rely on 3rd party applications.

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• further troubleshooting on a p8z77 motherboard

  - by Journeyman Geek

  I just bought a brand now asus p8z77 motherboard with a intel 3770. Its currently not booting - the system powers up for half a second and then powers down, and the CPU error light shines. I've tried switching ram between slots, switching PSUs, updating the bios (which can be done sans processor or ram on this model). Power: The 8 pin power connector is definitely in place correctly, and I've tried swapping PSUs between a new seasonic m12, and a known good cheapie PSU Ram: Ram is in the recommended slot for single stick operation, and tried swapping between the two sticks of DDR3 I have. Processor: Its installed correctly as far as I can tell, no obvious bent pins on the motherboard. At this point I'm guessing I'll need to RMA something. Are there any 'definitive' tests I can try, short of swapping CPU and motherboard that would let me know it is the CPU? Can I actually trust the error light on the motherboard?

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• How to determine the source for wakeup in hibernate

  - by Erik

  I have a big problem with my home theater PC that runs Windows 7 64Bit. Normally, I send that PC to hibernate every evening, but from time to time, it keeps waking up for no obvious reason, and stays on until I realize, which is sometimes half a day later :( I have already checked for Windows update, which is not set to automatical, since I prefer installing updates manually. When I look in the system event log, there is an entry called "Power Troubleshooter" which tells me that my system was reactivated at a specific time, but it also says: Source = Unknown, which is the most annoying part. So how can I actually figure out, which process reactivates the PC? Is it possible to set a group policy which forbidds applications or services from scheduling tasks that allow waking up from hibernate at all?

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• Accessing VMware Player across the network

  - by Tiffany Walker

  My network: 192.168.2.2 (computer) 255.255.255.0 (mask) 192.168.2.254 (gateway) The VMplayer is: 192.168.233.129 (ip) 255.255.255.0 (mask) 192.168.233.255(bcast) It's obvious the player can't be access from other systems because of the wrong network settings. However, I am not sure as to how to change that. Obviously I have to edit the ifcg-eth0 but I know I also need to edit it on the host system to make it accessably. Is this done from inside VMware Player? Or do I need to edit the network devices? The host box is Windows. Inside VMware is Linux.

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• Timeout ssh sessions after inactivity?

  - by Insyte

  PCI requirement 8.5.15 states: "If a session has been idle for more than 15 minutes, require the user to re-enter the password to re-activate the terminal." The first, and most obvious, way to deal with ssh sessions that are idling at the bash prompt is by enforcing a read-only, global $TMOUT of 900. Unfortunately, that only covers sessions sitting at the bash prompt. The spirit of the PCI spec would also require killing sessions running top/vim/etc. I've considered writing a */1 cron job that parses the output of "/usr/bin/w" and kills the associated shell, but that seems like a blunt instrument. Any ideas for something that would actually do what the spec requires and just lock the terminal? I've looked at away and vlock; they both seem great for voluntarily locking your terminal, but I need a cron/daemon task that will enforce locking.

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• How do I restore the default applets to Gnome's notification area?

  - by gbacon

  I have a fresh install of Karmic Koala. In a botched attempt at trying to change my default window manager, I somehow removed at least three applets from the notification area: network manager (nm-applet), volume control (gnome-volume-control-applet), and the battery meter (???). Now if I logout and back in, these applets don't run, but I can start them from the command line. Because it's a fresh install, I completely removed my luser account and home directory. After recreating my account, I was frustrated to find that the applets are still missing and no obvious way to add them back. How can I restore the default configuration?

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• Why do most routers not include local DNS?

  - by user785194

  I need to change my firewall/router, and I'd prefer something with built-in DNS to resolve queries on the local subnets. I've got a mixed Linux/Windows system, often with only one computer turned on, and I frequently have problems resolving local names. I don't want to keep a Linux box permanently on just for DNS, and I'd prefer to have DNS in my router appliance, which is always on. I search Google for this occasionally but never find anything. You always get the obvious answers - it's not possible, put everything in /etc/hosts, NetBIOS, dedicated box, etc. So what am I missing? Why don't "cheap" routers let you do this? I'm pretty sure that Cisco kit does this. Almost all cheap routers will let you do MAC address reservation, to let them assign static IP addresses for DHCP. So why can't they simply do DNS as well for everything on the local subnets, just passing through remote domains to the ISP?

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• Backing up a Linux VPS with RSync to Vista

  - by Frank

  I've been working to setup a Linux VPS to host a couple of Wordpress sites and eventually a Mercurial server. I've setup one site and things have gone well. However, before I start moving other things to the VPS, I need to setup a backup solution. My provider, Linode, suggest RSync (among a couple of other options) to do backups. I've seen a few posts on this site that suggests other backup solutions including going to the Amazon Cloud but that costs money and the VPS is all the money I want to spend on this for the time being. So, to help solve that I want to have my backup computer be my home desktop computer. Assuming I'm using RSync, is it possible to use my Vista based home computer to become the destination for the backup? And if it is possible, what type of command or connection would I need to configure on the vista machine? Any insight would be helpful. It's probably obvious, but I've never used RSync.

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• Rate of UDP packet loss over WLAN

  - by Martin

  While testing something with TFTP I noticed lots of timeouts (and slow speed as result) when I used my WLAN - and no problems when using a network cable. A quick test program sending/receiving UDP revealed that there are about 3-5% packets lost. While it's obvious that WLAN has to be less reliable than LAN, I have no knowledge what loss rates are considered 'normal' - and when there is a need to further investigate the network infrastructure. Are there 'typical' packet loss rates on WLAN (and other network technologies e.g. PowerLAN, WAN, ...? Thanks

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• Excel: How do I copy hyperlink address from one column of text to another column with different text?

  - by OfficeLackey

  I have a spreadsheet where column A displays names in a certain format. There are 200-odd names and each has a different hyperlink (which links to that person's web page). I want to reformat the name order so it is "Surname, Name" rather than "Name Surname" and retain the hyperlink in the newly formatted column. I have achieved "Surname, Name" easily by splitting the names into two columns (using LEFT and RIGHT formulae) - forename and surname - then I have a new column with a formula to return "Surname, Name." However, the hyperlinks are not in that new column and I need them. I don't want to do this manually, for obvious reasons. I cannot find a way of copying just hyperlinks from column A without copying the text from column A. So, effectively, what I need is some sort of macro to take, for example, the hyperlink from A2 and copy it to H2, with H2 still retaining the updated ordering of name. I don't have the knowledge to write this myself, so would appreciate solutions.

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• Is there an easy way to always redirect facebook.com to facebook.com/events/list (Firefox, Osx)

  - by Tor Thommesen

  I often use facebook for communication while working. When I do, I'd rather not see the facebook newsfeed. Unfortunately it's hard to remember to not go to the frontpage and use facebook.com/messages or facebook.com/events. Is there any way to always redirect from the url https://www.facebook.com/ to https://www.facebook.com/events/list? I use firefox on osx. I have tried the redirector addon and I'm not able to make it work, not sure if I'm missing something obvious or if it's outdated/buggy.

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