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  • Unable to Align Layers in Photoshop Properly with CS2

    - by Jonathan Sampson
    Cannot Align Semi-Transparent Items? Windows Vista, Photoshop CS2. Steps to repeat: Create new document Fill a circle on a new layer Drop opacity of filled circle to 10% Create new empty layer below circle layer Merge empty layer with filled circle layer Select entire canvas Attempt to align layers to selectionlayer > align layers to selection > vertical centers I get the following error: Could not complete the Vertical Centers command because there are no layers to be moved. Clearly this is not true, as I'm selecting the layer with the semi-translucent ball on it. Now, if you had tried this same command prior to step 5 (when the layer was at 10% opacity) it would have worked. Is there some way around this problem? I need to move layers around that begin as transparent items, with a layer opacity at 100% where 100% of the layers opacity results in showing objects that are themselves not-very opaque. I've confirmed on another machine that this problem doesn't exist in CS3. I may exist in earlier copies of Photoshop, but I only have access to CS2 (has the problem) and CS3 (does not have the problem).

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  • Using the same Windows 8 Upgrade installer on multiple PCs

    - by Karan
    As per this article: You may transfer the software to another computer that belongs to you. … You may not transfer the software to share licenses between computers. But what if I have a bunch of PCs with a mix of XP/Vista/Windows 7? Can I purchase either the Windows 8 Pro Upgrade $40 (download only) or $70 (DVD) version (both of which come without a key) only once and use it to upgrade all the PCs? Since I'm not sharing the license and each PC has its own valid genuine license, it should be allowed, right, or is it illegal? Even if they want people to shell out $40/$70 for each PC, how would they enforce the use of the installer/media on only one PC each? EDIT: I have been given to believe by a source that the installer will only check for the previous OS' key, which is what is confusing me (I have never purchased an upgrade version before this, only full retail or pre-installed versions). Is this true or will I need to enter two keys to make the upgrade work, one for the previous version and then one for Windows 8? If the latter is the case, then the issue is solved since obviously the same Windows 8 key will not be valid for multiple PCs.

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  • Nginx + WordPress + HHVM: Why isn't Batcache working? Would Varnish help even more?

    - by javipas
    I've heard great things about HHVM, so I've setup a copy of WordPress blog (on another domain) with Nginx (with the Pagespeed module) and HHVM. Right now the benefits are obvious: on the same config, load times are between two and three times faster. I'm trying to speed up things a little bit, and I've also installed Memcached and Batcache. I've installed the memcached package, copied object-cache.php (Pastebin) onto the root folder of the WordPress blog, and after that I've installed the Batcache plugin and copied the advanced-cache.php (Pastebin) file onto the wp-content folder. Also, I've included the line define('WP_CACHE', true); in the wp-config.php file. It seems it doesn't work, though. If I quickly reload the page several times Batcache should show the cached page, but it doesn't. It's easy to check that by reloading (Cmd+R on Chrome on OS X) the page several times and then viewing the page's code. Under the <head> section I should see some batcache stats, but they aren't there. I wonder if someone could give me some hint on this. On a side note, I don't know if I could add some other component in order to help the performance be even better. I'm thing about Varnish, but I'm not sure if it's just useless and it's just another way to the same I'm currently doing. Any other component there? (I'll test CDN for images, minifying js, etc and some other tricks as well, but I'm talking from the server perspective).

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  • iCloud backup merges or overwrites?

    - by Joe McMahon
    The following happened today (it was six AM my time, so yeah, I was dumb and dropped stitches in this process): A friend had a problem with her iPhone and needed to reset it. Unfortunately she did the reset while connected to iTunes and the restore process kicked in. In my sleepy state, I told her to go ahead. She did, and restored the most recent local (iTunes) backup (from July last year - she doesn't back up often, as she has an Air which is pretty full). During setup on the phone, she was prompted to merge data with the iCloud copy, and did so. There was no "restore from iCloud" prompt. Obviously I should have made sure she was disconnected from iTunes before she did the reset, or had her set it up as a new device and then restored from iCloud, but water under the bridge now. (Side question: could I have had her disconnect and then restart the phone again and avoid this whole process?) The question is: was the "merge" that happened in this process a true merge, or a replace? Her passwords for Mail were wrong, since they were the old ones from the old backup. If she does the wipe data and restore from iCloud, will she get her old SMSes and calendar entries back? Or did the merge decide that the phone, despite it being "old" was right and therefore the SMSes, calendar entries, etc. were discarded? As a recovery option, I have a 4-day-old iTunes backup here from ~/Library/Application Support/MobileSync/Backup, but she and the phone are 3000 miles away, and it's 8GB, so I can't easily restore it for her. I do have the option of encrypting it and mailing it on a data stick if the iCloud backup is now toast. Should she try the wipe and restore from the cloud (after backing up locally), or should I just get the more-recent backup in the mail? My goal is to get everything (especially the SMSes) back to the most recent version possible.

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  • convert a pdf/djvu file to png's under Linux how?

    - by user62367
    Imagemagick doesn't work (Fedora 14) on one PDF file: $ convert -density 300 INPUT.PDF out.png Error: /ioerror in --showpage-- Operand stack: 1 true Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1878 1 3 %oparray_pop 1877 1 3 %oparray_pop 1861 1 3 %oparray_pop --nostringval-- --nostringval-- 141 1 319 --nostringval-- %for_pos_int_continue --nostringval-- --nostringval-- 1761 0 9 %oparray_pop --nostringval-- --nostringval-- Dictionary stack: --dict:1157/1684(ro)(G)-- --dict:1/20(G)-- --dict:75/200(L)-- --dict:75/200(L)-- --dict:108/127(ro)(G)-- --dict:288/300(ro)(G)-- --dict:22/25(L)-- --dict:6/8(L)-- --dict:22/40(L)-- Current allocation mode is local Last OS error: 27 GPL Ghostscript 8.71: Unrecoverable error, exit code 1 convert: Postscript delegate failed INPUT.PDF': @ error/pdf.c/ReadPDFImage/645.<br> convert: missing an image filenameout.png' @ error/convert.c/ConvertImageCommand/2953. $ And it doesn't work on a djvu file: $ convert -density 300 INPUT.DJVU out.png convert: no decode delegate for this image format INPUT.DJVU' @ error/constitute.c/ReadImage/532.<br> convert: missing an image filenameout.png' @ error/convert.c/ConvertImageCommand/2953. $ an extra: the output filenames. out-0.png out-1.png ... out-9.png out-10.png out-11.png .. out-123.png out-124.png is there a way to be like this?: out-000.png out-001.png ... out-009.png out-010.png out-011.png .. out-123.png out-124.png because they would be in wrong order: out-0.png out-1.png out-10.png out-11.png out-123.png out-124.png out-9.png thank you :\

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  • convert a pdf/djvu file to png's under Linux how?

    - by user62367
    Imagemagick doesn't work (Fedora 14) on one PDF file: $ convert -density 300 INPUT.PDF out.png Error: /ioerror in --showpage-- Operand stack: 1 true Execution stack: %interp_exit .runexec2 --nostringval-- --nostringval-- --nostringval-- 2 %stopped_push --nostringval-- --nostringval-- --nostringval-- false 1 %stopped_push 1878 1 3 %oparray_pop 1877 1 3 %oparray_pop 1861 1 3 %oparray_pop --nostringval-- --nostringval-- 141 1 319 --nostringval-- %for_pos_int_continue --nostringval-- --nostringval-- 1761 0 9 %oparray_pop --nostringval-- --nostringval-- Dictionary stack: --dict:1157/1684(ro)(G)-- --dict:1/20(G)-- --dict:75/200(L)-- --dict:75/200(L)-- --dict:108/127(ro)(G)-- --dict:288/300(ro)(G)-- --dict:22/25(L)-- --dict:6/8(L)-- --dict:22/40(L)-- Current allocation mode is local Last OS error: 27 GPL Ghostscript 8.71: Unrecoverable error, exit code 1 convert: Postscript delegate failed INPUT.PDF': @ error/pdf.c/ReadPDFImage/645.<br> convert: missing an image filenameout.png' @ error/convert.c/ConvertImageCommand/2953. $ And it doesn't work on a djvu file: $ convert -density 300 INPUT.DJVU out.png convert: no decode delegate for this image format INPUT.DJVU' @ error/constitute.c/ReadImage/532.<br> convert: missing an image filenameout.png' @ error/convert.c/ConvertImageCommand/2953. $ an extra: the output filenames. out-0.png out-1.png ... out-9.png out-10.png out-11.png .. out-123.png out-124.png is there a way to be like this?: out-000.png out-001.png ... out-009.png out-010.png out-011.png .. out-123.png out-124.png because they would be in wrong order: out-0.png out-1.png out-10.png out-11.png out-123.png out-124.png out-9.png thank you :\

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  • explanation of RAM specs, and what do I need for a Gaming rig

    - by ewok
    I am looking into upgrading my custom built PC's RAM. I use the machine mostly for gaming, but I don't really know a ton about RAM, so I wanted to ask a few questions. The research I've done tells me there is a negligible increase in speed for anything above 1600 MHz. is this true or is it worth the extra money to go higher? Other than drawing more power from the PSU, is there any real difference in performance with different voltages (1.5V vs 1.65V)? most of the kits I've found in the 2x4 1600 range have a CAS latency of 9 and timing of 9-9-9-24. For a significant increase in price (usually about 1.5x), I can get either 8 or 7 and lower timing. Is it worth the cost? What I am looking for here is someone to give a good explanation of what the different specs represent, and how that relates to the performance of the machine. Specifically, I'm looking for what specs I need to focus on for a good gaming rig. I am NOT looking for a "buy this, it's the best RAM" without an explanation of why. The information will be much more valuable as it will allow me to make my own informed decision. As they say, give a man a fish, he'll eat for a day. teach a man to fish, and he'll eat for the rest of his life.

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  • File locked / read-only

    - by oshirowanen
    On a networked computer, I have a file which is coming up as read-only because someone else has it open. This is not true. This is a file stored locally on the computer and it is not being used by anyone else. I can login to the same computer using a different user, and the file opens up fine. I just get the issue with a particular user account. Other than deleting theses account/profile and creating it again, how can I unlock this file? Double clicking on this file gives me a message saying The file is locked for editing by another user, or the file (or the folder in which it is located,) is marked as read-only, or you specified that you wanted to open this file read-only. I don't think the folder is locked, because I can use other files in that folder fine, it's just 1 particular file which is causing this issue. I know that only 1 user is using this file as the file is on his c: and the same file works fine if he logs off to allow another user to log in.

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  • Using awk to split text file every 10,000 lines

    - by Sneaky Wombat
    I have a large gzip'd text file. I'd like to something like: zcat BIGFILE.GZ | awk (snag 10,000 lines and redirect to...)|gzip -9 smallerPartFile.gz the awk part up there, I basically want it to take 10,000 lines and send it to gzip and then repeat until all lines in the original input file are consumed. I found a script that claims to do this, but when I run it on my files and then diff the original to the ones that were split and then merged, lines are missing. So, something is wrong with the awk part and I'm not sure what part is broken. Here's the code. Can someone tell me why this doesn't yield a file that can be split and merged and then diff'd to the original successfully? # Generate files part0.dat.gz, part1.dat.gz, etc. # restore with: zcat foo* | gzip -9 > restoredFoo.sql.gz (or something like that) prefix="foo" count=0 suffix=".sql" lines=10000 # Split every 10000 line. zcat /home/foo/foo.sql.gz | while true; do partname=${prefix}${count}${suffix} # Use awk to read the required number of lines from the input stream. awk -v lines=${lines} 'NR <= lines {print} NR == lines {exit}' >${partname} if [[ -s ${partname} ]]; then # Compress this part file. gzip -9 ${partname} (( ++count )) else # Last file generated is empty, delete it. rm -f ${partname} break fi done

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  • Best way to create and restore a Drive Image with Windows 7? [closed]

    - by jasondavis
    Possible Duplicate: Want to create a system image I am about to build a new PC. I am a windows 7 user. For years now I have been wanting to install windows and all my favorite software, music, etc., and then make a drive IMAGE and be able to go in 6 months later or WHENEVER I want to start fresh and completely format my drives and restore my IMAGE and have all my settings, programs, etc be just5 like when I created the original image. I know there is many ways to do this but I have never done this 100% successfully and I have about a week to figure out how to do it perfectly for when I build my new PC. I have heard good things about using tried Acronis true image in the PAST for doing what I describe4, I tried using it but, but the newer versions are overly complex and don't even seem to work the way I hoped. I also see that Windows 7 has some sort of drive IMAGE creator itself as well. Does the newer Windows 7 image creator do what I am describing above? If it does do what I am asking for (complete drive image with windows, all programs and settings) saved to an IMAGE file that can easily be restored to ANY hard drive in the future? Please share your experiences, tips, ideas on how to achieve this the easiest and most reliable way please

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  • Assembly Level Language? Unlock iPhone 3GS with latest Baseband. Need Opinion

    - by getkenny
    Hi Guys, So its more like advice i need. I got 2 iPhone 3GS (Bootloader 06.02 and BB 05.11) which are lying around useless cause it was bought it from US and now i am in Dubai. Cannot use the phone because there is no unlock. Now rather than waiting and relying on other people to provide a unlock for the baseband , i was thinking of learning what it takes to unlock a iPhone. I currently don't even know what i got to learn to do this. I understand from soem reading around that i will need to learn ARM to understand the baseband and try to find a exploit: is it correct? I really want to help people out in getting their iPhones working. Also the iPhones cost was $645 each (16GB) so its not like Apple is going to loose any money of it, the person who bought it for me thought that if your not buying with an AT&T contract it means that it is unlocked but it is not true. I need help, i am willing to learn and you guys are the best bunch around to give me advice. Regards.

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  • What should the memory configuration be?

    - by AngryHacker
    We have a server (ProLiant DL585 G1 by HP), which hosts Windows 2003 x64 R2 with SQL Server 2005 x64 and a host of other apps. It currently has 6GB of RAM. We are currently very memory constrained and it's clear that we need to get more memory. 8GB will probably do the trick, however, we are not sure as to what memory configuration will give us the biggest performance buck. Currently all 8 memory slots are filled (4 slots have 1GB chip, while the other 4 slots have 512MB chips). Should we throw the 512MB sticks away and just replace them all with 1GB sticks? If we decided to go with a higher memory configuration (e.g. 10GB or 12GB or 16GB), is it advisable to keep all the sticks of the same size or it does not matter? I was once told that interleaved memory requires (for better performance) that memory should be in multiples (e.g. 2 or 4 or 8 or 16, etc...). I am not even sure that the server has an interleaved configuration (and don't know how to find out), but is this true? Thanks.

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  • ability to see free/busy detail information for conference rooms in Outlook 2007 and Microsoft hosted Exchange solution

    - by Malav
    recently my company migrated from an in-house Exchange server to the Microsoft hosted exchange online solution. My client is Outlook 2007. Before the migration, I could see the details of the meetings when I hovered on the busy blue bar for a resource such as a conference room. I could click on the meetings and see the invite list and the contents of the meeting. Ofcourse if the meeting was marked as private I could not. however after the migration to the online solution, I cannot see the detailed information. I can still see if the room is busy or not but I can no longer see the details of that meeting. The IT folks can see the information and they claim that they can see it because they have full admin rights. It is their claim that in the hosted Exchange solution you can either have full access (admin access) and see the details or not see anything but just that the room is busy. there is no middle ground such as being able to see the details of the meeting but not having any admin rights. For some reason I believe this to be not true. Can someone please verify my doubts and inform me of what needs to be done to see that information if my IT folks are wrong? thanks

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  • Connection timed out on Node.js app running under CentOS

    - by ss1271
    I followed this tutorial to create a simple node.js app on my CentOS: the node.js version is: $ node -v v0.10.28 Here's my app.js: // Include http module, var http = require("http"), // And url module, which is very helpful in parsing request parameters. url = require("url"); // show message at console console.log('Node.js app is running.'); // Create the server. http.createServer(function (request, response) { request.resume(); // Attach listener on end event. request.on("end", function () { // Parse the request for arguments and store them in _get variable. // This function parses the url from request and returns object representation. var _get = url.parse(request.url, true).query; // Write headers to the response. response.writeHead(200, { 'Content-Type': 'text/plain' }); // Send data and end response. response.end('Here is your data: ' + _get['data']); }); // Listen on the 8080 port. }).listen(8080); However, when I uploaded this app onto my remote server (assume the address is 123.456.78.9), I couldn't get access to it on my browser http://123.456.78.9:8080/?data=123 The browser returned Error code: ERR_CONNECTION_TIMED_OUT. I tried the same app.js code which runs fine on my local machine, is there anything I am missing? I tried to ping the server and its address was reachable. Thanks.

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  • How to reinstall bootloader after migration to SSD

    - by hijarian
    I must say, it was difficult to name this question. Basically, I need to properly reinstall the bootloader on my system, because I already have the working system disks for my OSes. The long story is this: I had the large slow HDD with Windows7 & Debian Wheezy dual-boot on it, perfectly bootable. Then, I ordered the SSD drive and prepared my system partitions to fit onto the much smaller SSD. I wanted the following schema: 128 GB Windows 24 GB / on Debian 86 GB /home on Debian Strange size for /home because there's no such thing as true 256GB disk drive. So, I've prepared such a partitions on my initial HDD and installed the new SSD and then I loaded the GParted live USB (can't remember now how it was really named), and then just copypasted the partitions from HDD to SSD. So, now I have the following partitions across the physical disks: SSD 128 GB copy of original Windows partition 24 GB copy of presumably Debian / 86 GB copy of presumably Debian /home HDD 128 GB Windows 24 GB / on Debian 86 GB /home on Debian ... several other partitions with non-system data ... And the behavior of the system right after the Ctrl+C, Ctrl+V in GParted was as follows: no GRUB, system boots right into the Windows on HDD. In BIOS settings are to boot from SSD first. I managed to create the Debian Testing installation USB and loaded it into the rescue mode, found that it identified my SSD as /dev/sda and installed the GRUB to the /dev/sda. Now my system loads the GRUB which lists both Windows and Debian. From HDD. So, I am now back into initial position. Please, how I should set up the GRUB so it'll load the OSes correctly from SSD? Should I fire up my Debian, fiddle with the GRUB's config and reinstall it again to the same place (at SSD)?

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  • Anyone have real world experience with Rackspace Cloud Sites at high scale?

    - by Allara
    I have a pure web service application layer using .NET. I was originally planning to use Amazon EC2, but rolling my own autoscaling procedures is a bit intimidating, and the scaling isn't very granular from a cost perspective. If the app is successful, we could be looking at relatively high scale (millions of requests per month). The app uses Amazon SimpleDB as the database layer. As a test, I have the app running successfully in Rackspace Cloud Sites. Performance seems to be equal to (if not better than) a standard EC2 instance, even with the added latency of the SimpleDB requests travelling to the Rackspace network. However, testing at this stage is at a very low scale. My question is this: has anyone had real-world experience running a high scale application on Rackspace Cloud Sites? Moreover, once you pass the "included" 10,000 compute cycles per month, does the overall cost seem to be lower than rolling lots of EC2 instances? My assumption would be that with completely smooth scaling (i.e. only adding compute resources as needed), the cost could be lower on average. However, their stated goal of calibrating 10,000 CCs as a single 1.2 Ghz CPU seems on average to be much more expensive than EC2. I like the idea of no-touch scaling, but is it too good to be true?

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  • download and process a file by ftp at set intervals, with error handling, rescheduling and status messages

    - by compound eye
    I want to download a data file from a remote ftp server to my machine at regular intervals. Once the file is downloaded I want to call another script which will process the file. My development machine is mac os x, the eventual deployment environment is linux. What's would be the stock standard way to automate this? I know I can use cron to schedule curl to download and to run a script that will process the downloaded file at regular intervals, and I know could write a slightly more complex script or an application that would do this and add error handling, rescheduling and sending status emails. But one of my requirements for this project is to write as little custom code as possible, instead I should try to use standard, tried and true existing tools, and if I do have to write code, to try and write the most straightforward code possible. The reason for this is the code will potentially be installed on a large number of machines, all of which will need to be tweaked, customised and maintained by different people, long after I am gone from the project, so the intention is to use well documented, well supported tools as much as possible. This seems such a common task, there must be tools and scripts all over the internet, written by people who have carefully considered everything that could possibly go wrong when you need to download and process a file from a remote server at regular intervals, with error handling, rescheduling and sending status messages. Is that what Expect is for? What would you recommend? (the system will be downloading weather prediction data every six hours, so that the system can prepare in the event of bad weather warnings)

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  • Use preforker(ruby gem) with supervisor

    - by user1548832
    I also asked same question on stackoverflow.com http://stackoverflow.com/questions/13871169/use-preforkerruby-gem-with-supervisor But, superuser.com might much help to me. Can anyone amswer this? I want to run a server program using preforker ruby gem with supervisor. But error has occured. I wrote a following test program using preforker. #!/usr/bin/env ruby require 'rubygems' require 'preforker' Preforker.new(:app_name => 'test-preforker', :timeout => 60, :workers => 1) do |master| while master.wants_me_alive? do puts "hello" sleep 10 end end.run And a following supervisor config. [program:test-preforker] command=/home/tkono/tmp/test-preforker.rb stdout_logfile_maxbytes=1MB stderr_logfile_maxbytes=1MB stdout_logfile=/var/log/%(program_name)s.log stderr_logfile=/var/log/%(program_name)s.log autorestart=true Then, reload supervisor. # supervisorctl reload Restarted supervisord Here is the log file of supervisor. 2012-12-13 17:50:47,161 CRIT Supervisor running as root (no user in config file) 2012-12-13 17:50:47,163 WARN Included extra file "/etc/supervisor.d/test-preforker.ini" during parsing 2012-12-13 17:50:47,209 INFO RPC interface 'supervisor' initialized 2012-12-13 17:50:47,213 CRIT Server 'unix_http_server' running without any HTTP authentication checking 2012-12-13 17:50:47,215 INFO supervisord started with pid 12437 2012-12-13 17:50:48,231 INFO spawned: 'test-preforker' with pid 12440 2012-12-13 17:50:48,233 INFO exited: test-preforker (exit status 1; not expected) 2012-12-13 17:50:49,248 INFO spawned: 'test-preforker' with pid 12441 2012-12-13 17:50:49,261 INFO exited: test-preforker (exit status 1; not expected) 2012-12-13 17:50:51,267 INFO spawned: 'test-preforker' with pid 12442 2012-12-13 17:50:51,284 INFO exited: test-preforker (exit status 1; not expected) 2012-12-13 17:50:54,305 INFO spawned: 'test-preforker' with pid 12443 2012-12-13 17:50:54,308 INFO exited: test-preforker (exit status 1; not expected) 2012-12-13 17:50:55,311 INFO gave up: test-preforker entered FATAL state, too many start retries too quickly Please tell me what is wrong? A program using preforker cannot run with supervisor? preforker https://github.com/dcadenas/preforker supervisor http://supervisord.org/index.html

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  • Is it possible to use Google Docs Viewer to view files already in Google Docs?

    - by john2x
    The title is a little confusing. I'll elaborate. As far as I can tell, the Google Docs Viewer tool accepts a link to a raw document file (e.g. .doc, .pdf, et. al.), and renders its contents in the browser. For example, this url to a pdf http://research.google.com/archive/bigtable-osdi06.pdf when passed to Viewer, returns this link: http://docs.google.com/viewer?url=http%3A%2F%2Fresearch.google.com%2Farchive%2Fbigtable-osdi06.pdf What I'm trying to achieve is, use the Viewer to view a document already hosted in Google Docs (i.e. no longer a raw document file). When passing a link to a Google Docs document to the Viewer, the result is not as expected. It renders the link's HTML source instead of the document's contents. The reason I want to do this is that I want to be able to use the "embed" feature of Viewer to view Google Docs documents. Does Google Docs have a "link to embeddable view" feature? P.S. Here is a sample snippet to an embedded document. This is what I want, but pointing to an existing Google Docs document. <iframe src="http://docs.google.com/viewer?url=http%3A%2F%2Fresearch.google.com%2Farchive%2Fbigtable-osdi06.pdf&embedded=true" width="600" height="780" style="border: none;"></iframe>

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  • What hardware would I need (approx) to run ESXi server?

    - by mr.b
    Hi, I am considering to purchase off-the-shelf commodity hardware in order to build server that will host virtual machines using ESXi server. Intended purpose for this server is NOT mission critical tasks. It will have to run perhaps 20-50 Windows XP/Vista/7 virtual machines (in total, but closer to 20 figure). Each guest would have to have 1-2 GB of ram, and probably two-three times more disk space than guest OS needs with clean install and all updates applied (that would be around 6-8 GB for XP, and i believe closer to 10-15 for win7). Those guests will act as a test ground for a new product that is network management software, thus guests will idle most of their time once initially loaded, but if I give them some task to complete, they should be able to perform reasonably well. Now, from what I have learned... CPU is usually not much of an issue (6 cores would do it), memory should not be lacking, but doesn't have to be sum of all guests, because of overcommitment... That leads me to IO, which is, as it seems, the bottleneck. Since I have very little experience with ESXi (and ESX, too) server, I'd like to ask: How much memory could I save by overcommitment, and how does it affect performance? Is 6-core cpu enough to run above described system? Would it be possible to run entire server off two (or even one) SSD drives (to host system virtual disks, with few additional HDDs (2-3) in RAID 0 to be used as secondary storage? I read somewhere that ESXi allows having something like "master image", essentially virtual machine that is "deployed" many times, so that disk space can be saved by having only differences stored by specific guests, instead of copying around whole virtual disks. Is this true, and how can this help me? Are there any other things I need to take into consideration when building this off-the-shelf solution? I should probably mention here that I'm fully aware of issues like SPOF regarding power supply, raid 0, etc, but since it's only a testing ground and not a production system, it's not so important for me. Thanks, B.

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  • Securing NTP: which method to use?

    - by Harry
    Can someone good at NTP configuration please share which method is the best/easiest to implement a secure, tamper-proof version of NTP? Here are some difficulties... I don't have the luxury of having my own stratum 0 time source, so must rely on external time servers. Should I read up on the AutoKey method or should I try to go the MD5 route? Based on what I know about symmetric cryptography, it seems that the MD5 method relies on a pre-agreed set of keys (symmetric cryptography) between the client and the server, and, so, is prone to man-in-the-middle attack. AutoKey, on the other hand, does not appear to work behind a NAT or a masquerading host. Is this still true, by the way? (This reference link is dated 2004, so I'm not sure what is the state of art today.) 4.1 Are public AutoKey-talking time servers available? I browsed through the NTP book by David Mills. The book looks excellent in a way (coming from the NTP creator after all), but the information therein is also overwhelming. I just need to first configure a secure version of NTP and then may be later worry about its architectural and engineering underpinnings. Can someone please wade me through these drowning NTP waters? Don't necessarily need a working config from you, just info on which NTP mode/config to try and may be also a public time server that supports that mode/config. Many thanks, /HS

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  • How to reduce celeryd memory consumption?

    - by Gringo Suave
    I'm using celery 2.5.1 with django on a micro ec2 instance with 613mb memory and as such have to keep memory consumption down. Currently I'm using it only for the scheduler "celery beat" as a web interface to cron, though I hope to use it for more in the future. I've noticed it is the biggest consumer of memory on my micro machine even though I have configured the number of workers to one. I don't have many other options set in settings.py: import djcelery djcelery.setup_loader() BROKER_BACKEND = 'djkombu.transport.DatabaseTransport' CELERYBEAT_SCHEDULER = 'djcelery.schedulers.DatabaseScheduler' CELERY_RESULT_BACKEND = 'database' BROKER_POOL_LIMIT = 2 CELERYD_CONCURRENCY = 1 CELERY_DISABLE_RATE_LIMITS = True CELERYD_MAX_TASKS_PER_CHILD = 20 CELERYD_SOFT_TASK_TIME_LIMIT = 5 * 60 CELERYD_TASK_TIME_LIMIT = 6 * 60 Here's the details via top: PID USER NI CPU% VIRT SHR RES MEM% Command 1065 wuser 10 0.0 283M 4548 85m 14.3 python manage_prod.py celeryd --beat 1025 wuser 10 1.0 577M 6368 67m 11.2 python manage_prod.py celeryd --beat 1071 wuser 10 0.0 578M 2384 62m 10.6 python manage_prod.py celeryd --beat That's about 214mb of memory (and not much shared) to run a cron job occasionally. Have I done anything wrong, or can this be reduced about ten-fold somehow? ;) Update: here's my upstart config: description "Celery Daemon" start on (net-device-up and local-filesystems) stop on runlevel [016] nice 10 respawn respawn limit 5 10 chdir /home/wuser/wuser/ env CELERYD_OPTS=--concurrency=1 exec sudo -u wuser -H /usr/bin/python manage_prod.py celeryd --beat --concurrency=1 --loglevel info --logfile /var/tmp/celeryd.log Update 2: I notice there is one root process, one user child process, and two grandchildren from that. So I think it isn't a matter of duplicate startup. root 34580 1556 sudo -u wuser -H /usr/bin/python manage_prod.py celeryd wuser 577M 67548 +- python manage_prod.py celeryd --beat --concurrency=1 wuser 578M 63784 +- python manage_prod.py celeryd --beat --concurrency=1 wuser 271M 76260 +- python manage_prod.py celeryd --beat --concurrency=1

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  • Create custom launchers in GNOME 3

    - by hochl
    I'm using Debian testing, and I have been switched to GNOME 3 by the Debian update yesterday. I'm not very comfortable with the UI. I wanted to customize everything like I had it with GNOME 2, but I simply couldn't find any way to change preferences like I'm used to. I've digged some, but all answers I could find did not help me achieve my goals. So please, if anyone knows the solution to this I'd be thankful: 1) I want several launchers that launch terminals, with different arguments and different coloring/title. I have searched everything and there seems to be no menu, no right-click, nothing which is standard in any UI I know. How can I create several launchers in this bar on the left side that launch the same application, just with different parameters? With GNOME 2 this was a piece of cake. 2) I want to switch between different terminals using ALT-TAB. Right now, I'm always just getting to the same, already-opened terminal. When I open two terminals by simply creating the second one by issuing xterm &, I still get one Terminal entry with ALT-TAB, and I have to navigate with cursor keys or mouse wheel to select one of the two xterminals. Instead, I want to open a new terminal when I click the quick launch terminal icon from the bar on the left side of the screen and navigate through them like on KDE/GNOME 2/Windows/any reasonable UI. Can this be done? 3) Is there a trick to make bluetooth devices work like on GNOME 2? Right now, my BT keyboard won't pair anymore, which, as you can imagine, makes me pretty angry. and, if anything fails: 4) How can I switch back to GNOME 2 again? :-) Honestly, who did design this? What were they smoking? I feel like I'm not allowed to do anything except start one of any application that has an icon and just with the default parameters. That can't be true, right? I feel massively restrained by this stuff :(

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  • Why does 3.5 mm audio out work through headphones but not through external speakers?

    - by Rickster
    I have a computer that has a 3.5 mm audio jack on the front of it. The computer itself has no speakers, so this is the only way to hear sound. If I plug headphones into it, the audio properly plays through the headphones, and if I plug in external speakers it used to play through them as well. Just today I turned on my computer and the audio no longer plays through the speakers, but if I plug in the headphones instead it works. The speakers aren't broken, as both the speakers and headphones work in my iPod and play music. I thought that 3.5 mm jacks could not send data back to the computer, and the computer had no way of differentiating between different devices plugged into the jack. If this is true, how is it that the computer plays audio through the headphones but not through speakers plugged into the same 3.5 mm jack, and both devices are functional? Or is my knowledge on 3.5 mm jacks incorrect? I don't believe drivers are important, as the same driver runs the 3.5 mm jack for all devices, but if necessary I can provide additional information. Any ideas would be appreciated. Thanks!

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  • Chrome will not load a web page with an <embed> element

    - by rossmcm
    I have been trying to get a simple sound web page going: Sound.html <script> function PlaySound () { var sounder = document.getElementById ("ToneA") ; sounder.Play () ; } </script> <embed id="ToneA" height="1" width="1" src="https://dl.dropboxusercontent.com/u/311035/ToneA.mp3" autostart="false" enablejavascript="true"//> <button onclick="PlaySound () ;">Play</button> The test web page is here. It plays in IE, but not in Firefox or Chrome. My problem: Chrome reports "Could not load VLC Plugin". It seems to be a known problem that the VLC community don't necessarily feel like fixing at the moment, and is a result of Google choosing not to allow some certain kind of plugin. If I disable the plugin I no longer get the message but nothing happens when I click the button. Looking at the console in a debug window I see Uncaught TypeError: undefined is not a function Sound.html:7 PlaySound Sound.html:7 onclick which suggests Chrome could not find anything else to handle the sound file. How to I tell Chrome to use (e.g.) Windows Media Player? * UPDATE * This is apparently because the VLC plugin is a NPAPI plugin and Chrome no longer supports these. I have uninstalled VLC and this has removed the error on loading the webpage with an embedded sound element, but it still doesn't invoke WMP instead.

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