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• Justification of Amazon EC2 Performance

  - by Adroidist

  I have a .jar file that represents a server which receives over TCP an image in bytes (of size at most 500 kb) and writes it file. It then sobels this image and sends it over TCP socket to the client side. I ran it on my laptop and it was very fast. But when I put it on Amazon EC2 server m1.large instance, i found out it is very slow - around 10 times slower. It might be the inefficiency in the code algorithm but in fact my code is nothing but receive image (like any byte file) run the sobel algorithm and send. I have the following questions: 1- Is it normal performance of Amazon EC2 server- I have read the following links link1 and link2 2- Even if the code is not that efficient, the server is finally handling a very low load (just one client), does the "inefficient" code justify such performance? 3- My laptop is dual core only...Why would the amazon ec2 server have worse performance that my laptop? How is this explained? Excuse me for my ignorance.

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• Need suggestion for FireFox add-on to simplify tweeting with multiple accounts.

  - by JohnFx

  I've been using the Firefox Shareaholic browser add-on to post links quickly to my twitter account, and am very happy with it. Recently, however, my company has tasked me with updating our corporate twitter account too. Unfortunately, it doesn't seem to offer the ability to register multiple twitter accounts and let you select one when you tweet the current page. I'm looking for suggestions on a browser add-on for Firefox to do just this. Just to be clear, I'm not looking to be able to post a single link to multiple twitter accounts at one time. I just want a one click "twitter this" that lets me pick which account to post it to. Bonus: If you know a workaround to do this in Shareaholic, that would be even better.

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• BackupPC - are full backups really full when using rsync?

  - by mhost

  Hi, When you run a full backup in backuppc and you use rsync as the transfer method, does it actually transfer the full backup source? Or does it only transfer the changes? The docs seem to imply that it would transfer the full thing and only an incremental would transfer the changes. If this is the case, could I simply use incrementals only, and never do a full backup? The way the backups are stored (using hard links to make each incremental appear full), I would think that this would be the best method. Incrementals will only transfer the changes, yet each backup will appear full. Thanks.

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• Several border firewalls in the same network

  - by nimai

  I'm currently analyzing the consequences of multipath connections for the firewalls. In that context, I'm wondering if it's really uncommon to have several firewalls at the borders of a network to protect it. The typical case I'd imagine would be a multihomed network, for which the administrator would have different policies for links from different (or not) ISPs. Or maybe even in an ISP's network. What would be the practical (dis)advantages of such a configuration? Could you provide an example of an existing topology using several border firewalls?

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• is it okay to use random URLs instead of passwords?

  - by stew

  Is it considered "safe" to use URL constructed from random characters like this? http://example.com/EU3uc654/Photos I'd like to put some files/picture galleries on a webserver that are only to be accessed by a small group of users. My main concern is that the files should not get picked up by search-engines or curious power-users that poke around my site. I've set up an .htaccess file, just to notice that clicking on http://user:pass@url/ links doesn't work well with some browsers/email clients, prompting dialogs and warnings messages that confuse my not-too-computer-savy users.

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• Java login through LDAP

  - by Salda

  I am starting to write an application for our office and the first step is authentication through LDAP where all users already exist. Everything I need is a code in Java to check if the pair <nick,password> is right. Google found me many links, but I think that I will find here the most sofisticate, short and up to date solution (I don't want to read all articles like 2 whole days to do something so simple). I have written many dkBs of code in C++, but in Java I am total noob and I haven't coded anything with LDAP yet so try to be simple if speaking in Java and LDAP terms if possible.

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• Delete a iptables chain with its all rules

  - by timy

  I have a chain appended with many rules like: > :i_XXXXX_i - [0:0] > -A INPUT -s 282.202.203.83/32 -j i_XXXXX_i > -A INPUT -s 222.202.62.253/32 -j i_XXXXX_i > -A INPUT -s 222.202.60.62/32 -j i_XXXXX_i > -A INPUT -s 224.93.27.235/32 -j i_XXXXX_i > -A OUTPUT -d 282.202.203.83/32 -j i_XXXXX_i > -A OUTPUT -d 222.202.62.253/32 -j i_XXXXX_i > -A OUTPUT -d 222.202.60.62/32 -j i_XXXXX_i > -A OUTPUT -d 224.93.27.235/32 -j i_XXXXX_i when I try to delete this chain with: iptables -X XXXX but got error like (tried iptables -F XXXXX before): iptables: Too many links. Is there a easy way to delete the chain by once command?

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• How do I mount a sparse disk image permanently?

  - by Mike

  On Mac OS X 10.6.7, when I mount a sparse disk image (either by double-clicking it or using hdid from the command line), the image: Appears on my desktop Needs to be re-mounted every time I log in I'd like to set up the equivalent of an /etc/fstab which will mount the image when the system boots, and make it permanent - so I don't have to worry if my symbolic links will resolve or not. Is this more trouble than it's worth on a Mac? I noticed that there is no /etc/fstab, and /etc/fstab.hd contains a dire warning: IGNORE THIS FILE. This file does nothing, contains no useful data, and might go away in future releases. Do not depend on this file or its contents. I tried sudo hdid -notremovable <image>, which seemed like half of what I wanted (according to man hdid), but it failed with an error: hdid: attach failed - no mountable file systems.

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• Is there a way to make IETab always open a site in Internet Explorer?

  - by reg

  Hello, IETab offers a setting that lets you define sites that should always be opened using IE's rendering engine. This is great and I use it all the time. There are a few sites, though, with which I encounter problems when I access them this way (needless to say that these have some IE-only features, otherwise I would simply use Firefox without IETab). So my question is: is there a way to make IETab (or any other extension that does the same thing) automatically open a specific list of sites in IE? To be clear: I want a way to specify a list of sites that will open an external IE process from Firefox, when clicking on those links or bookmarks from within Firefox.

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• Desktop directory disappears in gnome-terminal, then appears again, but all files in it are deleted

  - by Ingen

  I am able to see my Desktop and with all its various links and files. But in the terminal when I try to access the Desktop directory: cd ~/Desktop I get: bash: cd: /home/administrator/Desktop: No such file or directory Then I find I am unable to access any of the files on the Desktop when I click on them although the file icons are there. Then the icons disappear after my clicking on them. Then I am able to access the Desktop directory in the terminal but the directory is empty i.e. all the files/folders have been deleted. What's going on? How can I fix this?

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• What's the strengths and weaknesses of existing configuration management systems?

  - by Daniel C. Sobral

  I was looking up here for some comparisons between CFEngine, Puppet, Chef, bcfg2, AutomateIt and whatever other configuration management systems might be out there, and was very surprised I could find very little here on Server Fault. For instance, I only knew of the first three links above -- the other two I found on a related google search. So, I'm not interested in what people think is the best one, or which they like. I'd like to know the following: Configuration Management System's name. Why it was created (as opposed to using an existing solution). Relative strengths. Relative weaknesses. License. Link to project and examples.

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• MAMP and WordPress - Theme is gone

  - by ninjaboi21

  Hey SuperUsers, I hope this is the right section to post this kind of question. If it's not, I am sorry. But to my question: I created a working WordPress blog, running locally with MAMP Pro. I wanted to share my site, and thought I would go public with it, but self hosted. I signed up at DynDNS for my domain and got it working. People can connect, myself included of course. But here goes my problem: Everytime I try to access my website (**.dyndns.info:8888), I am able to access it, but the theme and pictures are gone, so it's only pure text with some links. I can provide a picture of the website if you want it? But what is it I am doing wrong? I tried to enable Web Sharing, but that didn't make a difference. Thank you so much if you can figure this out!

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• Cant remove/delete symlink

  - by user477519

  I have tried to create a symlink and it threw this error: ln: accessing `.test': Permission denied Now I can't unlink or delete the symlink file. Tried Googling for help but could not find a solution. Please find the results of following commands. stat .test : File: `.test'stat: cannot read symbolic link `.test': Permission denied Size: 26 Blocks: 0 IO Block: 16384 symbolic link Device: 1fh/31d Inode: 312075453 Links: 1 Access: (0777/lrwxrwxrwx) Uid: (11160/ chatt) Gid: (11307/ pgr) Access: 2012-11-12 11:36:51.167327500 +0000 Modify: 2012-11-12 11:36:51.163331700 +0000 Change: 2012-11-12 11:36:51.163331700 +0000 Birth: - chattr -i .test: chattr: Permission denied while trying to stat .test lsatter .test lsattr: Operation not supported While reading flags on .test Any help would be appreciated. Thanks

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• file:// command-line arguments

  - by Cory Grimster

  Is it possible to pass command-line arguments to a program that is invoked via a file:// url? I'm trying to include Remote Desktop links in a wiki page that lists some servers: <a href="file:///c|/windows/system32/mstsc.exe /v:serverName">serverName</a> When I omit the argument the link works fine, but when I include it the link doesn't work. I Googled around a bit and couldn't find any references to this. I suspect that the answer is that file:// urls simple don't accept arguments (I can think of all kinds of ways to abuse them if they do), but I thought I'd throw it out there in case I've simply got the syntax wrong. Thanks.

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• SQL Distributed Reporting Services Setup

  - by Praesagus

  I am setting up two servers; one iis 7 and one sql 2008. I need to use reporting services. What is the best way to set up reporting services so that my iis box can serve the reports. I'm sure this is not an unusual configuration, but I'm having a lot of trouble finding an answer to this - probably because I am using the wrong terminology. Also does this configuration require two sql licenses (one for each server)? This sound like a lengthy explanation so links or even the correct terminology for this so I can find the answers myself would be much appreciated. Thanks

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• How to download a URL as a file?

  - by Michelle

  A website URL has "hidden" some MP3 files by embedding them as Shockwave files, as follows. <span class="caption"><!-- Odeo player --><embed src="http://odeo.com/flash/audio_player_tiny_gray.swf"quality="high" name="audio_player_tiny_gray" align="middle" allowScriptAccess="always" wmode="transparent" type="application/x-shockwave-flash" flashvars="valid_sample_rate=true external_url=http://podcast.cbc.ca/mp3/sundayeditionstream_20081125_9524.mp3" pluginspage="http://www.macromedia.com/go/getflashplayer"></embed></span> How can I download the files for off-line listening? I've found two methods: 1. The Stack Overflow Method Create a new local HTML file with just the links, for example: <a href="http://podcast.cbc.ca/mp3/sundayeditionstream_20081125_9524.mp3">Sunday Edition 25Nov2008</a> Open the file in the browser, right click the link and File Save Link As. 2. The Super User Method Install the Firefox addin Iget. (Be sure to use the right version for your Firefox version.) Tools Downloads Enter URL in the field. Are there any other ways?

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• What is the lightest, basic Email Server for Linux?

  - by Xeoncross

  I would like to install an extremely small mail server on my VPS and I am only interested in it sending out mail (activation links) from my web site. I don't need it to support mailboxes or incoming mail (although having that option for the future might be nice). The main requirement is that I don't have to worry about monitoring it as often and protecting against people bouncing messages off my server or wasting resources with incoming mail. I just want to send mail out. So something small that only listens on localhost would be ideal. The other requirement is that it is documented so I can learn how to set it up and manage it.

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• Is a low voltage licence needed to install network cable?

  - by BCS

  In some places in the US you need a "low voltage licence" to install "low voltage wiring" but I can't seem to find anything that says if this includes network wiring. (I know this will differ from place to place so please state where you are referring to.) Does the law say you need a licence? Does anyone pay attention to it? Are their any exception you known of? How sure are you of your information? Got any links? "Me specific" parts of the question. p.s. I'm looking for info on Idaho, USA but answerers for anywhere welcome. edit: I have some formal training in this and am completely confident that I can do it safely and correctly. However the training was pre-2008 befor Idaho switched to the national building code.

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• Solaris: What is the difference between .so and .so.1 files?

  - by Rob Goretsky

  I am trying to understand how/why certain library files are dynamically loaded by the linker on Solaris. I am using ldd to see this (with the -s switch to see what paths are tried by the linker). As an example, if I run "ldd /usr/local/bin/isql -s" I notice that one of the libraries that is searched for is called "libodbc.so.1". I notice that this does NOT match a file it finds along the way called "libodbc.so". So, it finally resolves to a place where there is a symbolic link between "libodbc.so.1.0.0" and "libodbc.so.1". My question is - what is the significance of the ".1" here? Is it to indicate a version number? Why do some installers create these symbolic links, while others don't?

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• How do I get a PDF link in a Word document to open in the default browser?

  - by Tweek

  I'm trying to create a Word document with links to resources on the web. If I create a hyperlink to a regular HTML file, when I click on the link, it opens in my default browser (Google Chrome) as expected. However, if I click on a link to a PDF file on a website, it opens in Internet Explorer. Before it opens, I also get the following prompt: Microsoft Office Opening http://www.example.com/example.pdf Some files can contain viruses or otherwise be harmful to your computer. It is important to be certain that this file is from a trustworthy source. Would you like to open this file? OK Cancel I'm using Office 2010, but I'm asking for a user who is using Office 2007 and is experiencing the same issue. (His default browser is Firefox.) We're both on Windows 7.

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• Run Dialog: Tab Key dont complete commands

  - by Gilney

  I like to use the Tab key to complete/skip commands/links in Shells/Browsers when typing. But when I hit the tab key in "Run Dialog" causes focus leave Text box, so i'm forced to leave home keys to use arrow keys. Is there a way change this behavior? Edit: I found here a flag that enables autocomplete in Run Dialog. This doesn't solve the question, but it helps when the command you want is the first option listed, because you just press enter instead of moving to arrow key and select the command. In my case this solves about 80% of cases.

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• Can't browse computer via nlb cluster name

  - by peg_leg

  I have a fileserver nlb cluster, currently set to single affinity, made up of 2 2008R2 servers. We switched the primary node today. Now our Windows XP workstations can't browse to the cluster name (i.e. \fileserver) but can browse to the cluster ip address (i.e. \192.168.1.1) and can browse the member server by name (i.e. \filesvr1). I remember having a similar issue when we had to change a registry setting to allow Windows XP boxes to see another file server that was in a failover cluster but had to be referred to by another name (\thisfileserver instead of \fileserver). Convoluted, for sure, but it helped to prevent any code changes from happening. Well all of the programmers have their code on \fileserver and we can't have them switch their links every time \filesvr1 supercedes \filesvr2 or vice versa. I can't remember that registry setting that allowed the file server to ignore that it's being called by the wrong name. HELP!

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• rsync --link-dest behaviour when run as sudo

  - by fotNelton

  In order to create regular backups, I'm using rsync together with --link-dest so as to create hard-links for unchanged files. For example: rsync -ax \ --partial --delete --delete-excluded --inplace \ --exclude-from=/tmp/temp_excludes \ --link-dest=/Volumes/Backup/current \ /Users /Volumes/Backup/2012-06-25 This works very well as long as I start the process from my normal user account. Though as soon as I start the process using sudo it behaves erradically, meaning that rsync copies all the unchanged files instead of hard-linking them. Since sudo modifies the environment, I've already also tried sudo -E in conjunction with making sure that my sudoers file has the corresponding option set. Well, that didn't work either. So, the question is, how can I run rsync using sudo? Whereas the above example only shows a backup of the Users directory, I also need to backup some system files that I can only access as root.

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• How to setup email server in ubuntu 12.04LTS(debian 7 wheezy/sid) running on linode vps

  - by shihon

  I am working on email server, since i tried several times to create email server on ubuntu12.04LTS with postfix + dovecote + postfixadmin + courier + clamav + spamassassin. But everytime i install these packages i face new problems, like mails send to localhost users and found in users maildir. But I can't determine how to configure/setup for send an email to external smtp like gmail, yahoo. The most worst thing i can't determine how to use sasl, because i am not using SSL so it is not worthy for my domain. This is so complicated, i search everywhere on google: links are https://help.ubuntu.com/community/PostfixCompleteVirtualMailSystemHowto http://www.starbridge.org/spip/spip.php?article1&lang=fr http://knopix.wordpress.com/2008/01/16/postfixadmin-postgresql-courier-squirrelmail-on-debian-etch-howtotutorial/ http://flurdy.com/docs/postfix/ Is there any article for install email server on ubuntu 12.04LTS. Please help me to understand these things.

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• Less daunting front end for SQL Server

  - by Martin

  We currently have a few users who have been using Access very succesfully to throw around large amounts of data. We've now got to the point where the data is just too large to be held in Access, as well as wanting to hold it in a single place where multiple users can access it. We have therefore moved the data over to SQL Server. I want to provide a general tool that they can use to view the data on the server and do some simple things like run queries and filters and export the data for offline manipulation. I don't want the support headaches that might come with rolling out SQL Management Studio, and neither do I want to have to create an Access database with links for each current database or ones that are created in the future. Can anyone recommend a simple tool that will connect to a server, list all the databases and allow a user to drill into a table and look at the data. Many thanks.

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