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• Hard Disk based storage library

  - by Ryan M.

  We have a Tandberg T24 tape device to handle all of our long term backups right now. We decided that we're not backing up nearly everything that we would like to and that we still have a lot of vulnerabilities. To get to where we want to be, we're going to have to back up a lot more servers than we're currently doing. All of our internal servers have some sort of directly attached drive (I.e. LaCie Raid box or a simple portable hard drive) doing backups, but what we want to do is get those backups off-site. The current tape drive is directly attached via SCSI to a Windows Server 2008 File Server. So to back up anything to tape, it has to be funneled through the File Server. With the current increase that we have planned, I don't think that funneling everything through the File Server is the right course of action and I'm thinking that maybe a second backup device would be more appropriate. I would like your input on a couple of ideas. 1) Doing HDD instead of tape. Tape is hard to deal with. We have a regular rotation cycle, so they don't need years and years of shelf life, so I'm wondering if something HDD-based would be better. 2) Something accessible over the network. Instead of having the device directly attached to one specific machine, have it available to all the servers over the network. Our File Server is a 12-disk raid 6 set up.. I was thinking something like that, but with no raid involved, all disks are stand alone so they can be used/installed/removed on an individual basis. Does any such thing exist? Thanks for your ideas. I'm really interested to hear about some of the solutions you guys are using..

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• How do I make a PPT file as small as possible?

  - by grunwald2.0

  Currently I am agonizing over several large presentation files, which I happened to reprint to PDFs... One thing I wondered: Do PPT's (from Microsoft Powerpoint) always to have to be that big? And what would be the strategies to make a PPT smaller? (If we say "ceterus paribus" at e.g. 25 slides and assuming that one isn't allowed to use a cloud-based service like GDocs, rocketslide or Prezio.) Of course there are the obvious "bad guys": Images and graphics. But: How about roll-over animations etc, who knows how much space they take? How about "smart arts"? Could one save file size if one would use "Open Office" or "Libre Office" Impress? (I didn't try it yet.) And "what if": What if we need to include e.g. five images (or charts that can't be remade in Excel in time), how would we best reduce the file size impact of those five images, if we needed to? I ask all this from an honest "business" perspective. I am no nerd or "Microsoft MVP" and I don't intend on delving into LATeX or similar yet. But that doesn't mean that I am not curious and very willing to learn. I am basically interested in (proven) best practices. Yes I know this question is lacking "initial research", but I think the perspective of my question is interesting and unique to a lot of people and if we intend to make SE a "Q&A" / Wiki kind-of reference site, this question might be a good way to "collect" advice on a question that has a very defined goal: Minimum file-size.

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• Input/output error reading USB backup drive on CentOS 6.4

  - by Kev

  I'm suddenly seeing some strange behaviour on our USB backup drive that doesn't make sense to me: (2013-10-21 14:58:23 [root@newdc /]$ cd /mnt/backup/ (2013-10-21 14:59:03 [root@newdc backup]$ ls -la ls: reading directory .: Input/output error total 0 (2013-10-21 14:59:05 [root@newdc backup]$ df -h /mnt/backup Filesystem Size Used Avail Use% Mounted on /dev/sda1 917G 843G 28G 97% /mnt/backup How is it possible for the OS to know how much is in use, but I can't ls any of it as root? Or more to the point, what problem does this indicate? /var/log/messages said this: Oct 21 14:57:54 g5 kernel: EXT4-fs error (device sda1): ext4_journal_start_sb: Detected aborted journal Oct 21 14:57:54 g5 kernel: EXT4-fs (sda1): Remounting filesystem read-only But...read-only is something different than 'throw an io error'... After unmounting to try fsck on it, I had someone on-site look at it, and the drive was not spun up, and had a slow-flashing light, which I believe means it was in a power-suspend mode. So I had them unplug and replug the USB cable, and now (before remounting) it says: fsck from util-linux-ng 2.17.2 e2fsck 1.41.12 (17-May-2010) /dev/sda1: clean, 2805106/61046784 files, 181934167/244182016 blocks I then mount it and now ls works and df reports: Filesystem Size Used Avail Use% Mounted on /dev/sda1 917G 680G 191G 79% /mnt/backup What would cause it to go into such a state without being asked to? Why all the weird behaviour, and now it appears to not be corrupt?

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• Can't do anything with Ext. HDD, ".Trashes" is probably the boogyman. (On a MAC!)

  - by Sander Schaeffer

  I bought a external Harddrive today, A Samsung. But I'm not able to do anything with it A few notes on that. I can't put anything on the harddrive. It keeps on 'preparing copying files' I can delete anything on the harddrive system files, except the folder ".Trashes". It gives error 'Unexpected error: -50' I've tried to empty my own trashcan, no changes. I've set the file permission on the .Trashes to read/write everyone, doesn;t change a thing Trying to format the whole drive with DiskUtility, but quits at start, because the drive cannot be deactivated I've tried a few terminal commands sudo -s -r rf /Volumes/Untitled\ 1/.Trashes - Directory not empty -r rf /Volumes/Untitled\ 1/.Trashes - no permissions Also cd /Volumes ls -al cd name_of_partition ls -al -rm -rf .Trashes Again: Permission error. Also: I can't change drive permissions via Disk Utility, via the button 'recover drive permissions', because it is 'blank' I really can't figure out how to delete .Trashes, format the drive or get the damn thing working. Any suggestions? p.s. If this is the wrong Stack Exchange site: Please redirect me!

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• IIS Request Filtering Rule for User Agent

  - by alexp

  I'm trying to block requests from a certain bot. I've added a request filtering rule, but I know it is still hitting the site because it shows up in Google Analytics. Here is the filtering rule I added: <security> <requestFiltering> <filteringRules> <filteringRule name="Block GomezAgent" scanUrl="false" scanQueryString="false"> <scanHeaders> <add requestHeader="User-Agent" /> </scanHeaders> <denyStrings> <add string="GomezAgent+3.0" /> </denyStrings> </filteringRule> </filteringRules> </requestFiltering> </security> This is an example of the user agent I'm trying to block. Mozilla/5.0+(Windows+NT+6.1;+WOW64;+rv:13.0;+GomezAgent+3.0)+Gecko/20100101+Firefox/13.0.1 In some ways it seems to work. If I use Chrome to spoof my user agent, I get a 404, as expected. But the bot traffic is still showing up in my analytics. What am I missing?

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• .htaccess with godaddy not working in subdomain

  - by explorex

  Hi, i have a site uploaded to shared subdomain (which is inside a folder). and htaccess is not working. please get details from here. EDIT::copied from stack overflow Hi, i uploaded as website to a subdomain, and every page is not working except the front page please check it here. what could be the possible reason? i shoud have 8 pages in front level and many more on admin level but i am getting 404 error as you can see, does anyone has idea or suggestion? UPDATE:: .htaccess file RewriteEngine On RewriteCond %{REQUEST_FILENAME} -s [OR] RewriteCond %{REQUEST_FILENAME} -l [OR] RewriteCond %{REQUEST_FILENAME} -d RewriteRule ^.*$ - [NC,L] RewriteRule ^.*$ index.php [NC,L] UPDATE to url rounting i do have few url router like below BUT i dont have any default router $router->addRoute( 'get-destination', new Zend_Controller_Router_Route('destination/get/:id/:dest-name', array( 'controller' => 'destination', 'action' => 'get', 'id' => 'id', 'dest-name' => 'dest-name' )) ); just to make look cooler and on my navigation (which is loaded from xml i have) something like <nav> <home> <label>HOME</label> <controller>index</controller> <action>index</action> <route>default</route> </home> since i was getting url problem from where url was routed and please check phpinfo at http://websmartus.com/demo/globaltours/public_html/phpinfo.php

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• Is it possible to create a simple frontend indexer for openbittorent torrents?

  - by SimonK

  I run a website which distributes a few files every now and again, live music performances by a rock band. I create a torrent file, set the trackers as openbittorrent, publicbt and other similar open trackers. I upload the torrent file to my forum, my users download it and the files are shared. No problems there. What I would like to do is index those torrents properly on my website though so I can follow seeders/leechers and other stats online. I know the open torrent trackers don't have an index but I am aware of many, many indexing sites that do that exact thing. I don't know how though. So what I'm asking is what do I need to do to do that myself? I simply want to create a page that lists the torrents I and other users on my site create, the seeders/leechers ratio and a link to the torrent file etc. What data do I need to be able to do that? I'm proficient in general web design but I don't know what I would need data wise to pull the required info on the torrents? Thanks

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• How can use mod_rewrite to redirect a multiple specific URLs containing multiple query strings?

  - by Derek

  Hi there folks, we recently migrated a site from a custom CMS to drupal. In an effort to preserve some links that our users bookmarked (we have about 120 redirects) we would like to forward the original URLs to a new URL. I have been searching for a couple days, but can't seem to find anything simple to what I need. We have existing URLS that contain one or more query strings, for example: /article.php?issue_id=12&article_id=275 and we would like to forward to the new location: http://foobar.edu/content/super-happy-fun-article I started using: RewriteEngine On RewriteRule ^/article\.php?issue_id=12&article_id=275$ http://foobar.edu/content/super-happy-fun-article [R=301,L] This, however, does not work. A simple RewriteRule works: RewriteRule ^test\.php$ index.php It is unclear to me how I need to use {QUERY_STRING} with multiple Basically it's 120 simple redirects that go from one existing URL to a new one. I don't need ranges [0-9], because there is no sequential order to existing URLs. Perhaps I can do what I need with RewriteMap and a simple text file that contains a line like this: index.php?issue_id=12&articleType_section=0&articleType_id=65 http://foobar.edu/category/fall-2008 If anyone has any idea on using mod_rewrite to accomplish this or if there is a better, or more simple mod, I am open to that as well. Thanks!

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• 'Future-proof' Live Audio Capture & Broadcast [migrated]

  - by maxpowers

  I'm looking to implement some live audio broadcasting functionality within a Ruby on Rails site for a client and was hoping I could get some input from people who have tackled this type of thing before. Essentially what I need to do is capture and record a user's audio (via microhpone, line in, etc), then stream that to 1,000+ listeners with very little latency, like sub 2 second if possible. So it looks like we've got 3 parts: Web-based audio capture (likely with Flash or JS) Server to accept audio feed and stream to listeners (likely Icecast or Wowza) Actual audio player (maybe HTML5 w/ Flash as a fallback? Maybe this jPlayer fork) Does RTMP makes sense here? Or maybe HTTP? What's the most 'future-proof' way to make this happen? Building with mobile in mind, but still want to be able stream to anyone. I've found lots of potentially helpful threads and software but I'm struggling to get an idea of how it all fits together. I'm a front end guy and way out of my comfort zone so if anyone has insights to offer, I'd love to hear them.

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• Google Chrome Browser

  - by Harish

  Hi friends. Am using Google Chrome as my default web browser. I don't have any problem with it. The only problem rise is when I enter gmail.com and login into my account. I need to go to Histories in Google chrome (ctrl + shft + del) and select "Del Cokies and Other datas" for entering into gmail again. My gmail page is workin just once. I nedd to log in. Check my mail and I have to clear the cookies in order to log in again If i fail, This is d info I get The webpage at https://mail.google.com/mail/?shva=1&ui=html&zy=l&pli=1&auth=DQAAALgAAABhdI_K9uptgb6yQfGVmnl74VZEUH7U2M7WGJn3kJnCiY0CNI5QBU3X-g6UjPENGoHKSHE9nRna_Ygu_d59mN-HG1SUzNpI_UEMJ9CwDqZAYxYLEJl8r_JA2qJNGF8H0fdKfn99Gb2YeI-lprGxCrWRT7LicyADxQvNLQ6l9xBvOccEBSJfdIrna8dOXeX06N41L0zpnLQrVG1qdulR7LxId9XwtVb6QtfhwnambqLoNiY402Y5pjGG1_gFL4dNpJA&gausr=hariss89%40gmail.com has resulted in too many redirects. Clearing your cookies for this site or allowing third-party cookies may fix the problem. If not, it is possibly a server configuration issue and not a problem with your computer. Here are some suggestions: Reload this web page later. Learn more about this problem. Wat can I do ...

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• How do you enable webcam support in facebook for ubuntu 10.04?

  - by Jonathan

  I think I have finally arrived at an insolvable equation: Chromium v.7 + Ubuntu 10.04 + Sun Java 6 + Webcam + Facebook + Flash 10 = non-functional All of those items listed above are potential points of failure in this situation, and any help narrowing them down would be fantastic. I am simply trying to enable webcame support directly through Facebooks website. Forum searches and the usual googling turn up few posts related to this specific equation. Two of the major suggestions include: 1) Installing the Sun (I refuse to say oracle sob)-provided Java implementation instead of the OpenJDK normally installed in ubuntu. And yes, after installing it, I did update all my default supports to use the sun commands over the openjdk. 2) Somehow enabling Facebook as a permitted site to access my webcam using Flash settings. I have not been able to explore option 2 because I cannot find a way to adjust the Flash settings in chromium 7. Other factors that do not help include the fact that I am pretty sure facebook changes its webcam interface every 10 seconds just to keep troubleshooters and support personnel on their toes. If anyone has a OTP that informs us of the next shift in the app, a leak would be greatly appreciated! Cheers!

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• Windows Server 2008 IIS7 - page requests randomly hang or timeout

  - by seb835

  I've just installed a fresh copy of Windows Server 2008 x64 with IIS7 and PHP (fast CGI). However, I'm noticing that after moving my web site from a similarly specified machine to this one, I'm getting issues. The issue seems to be that randomly, as I'm clicking through the web pages being served, the browser will suddenly hang saying "waiting for mysite.com...". Sometimes the page will then timeout, or finally resolve after 20 to 30 seconds, but maybe missing the CSS style sheet. Very strange, as this is the only website installed on this new server, and only myself using/testing it. Server is installed in the same data centre below the old server. Has anyone else had a similar problem? I tried increasing the max workers pool to 10 (from 1), but this has no effect. Seems to happen most frequently after 1 or 2 minutes of inactivity on the website, then trying to load/refresh a web page. Many thank for any info and help. Kind Regards, Seb

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• IIS 7 much slower than IIS 6

  - by JoeJoe

  I have a asp.net 3.5 web application running fine on Windows2003 IIS6. I published same exact application to IIS7.5 (Win2008R2) on a faster box (i5,8Gram) and it is significantly slower. 5-6 sec per page vs. 1-2 sec per page. During that time the Task Mgr CPU is always under 10%. Both attach to same database on other box. Benchmark is consistent from any other client browser or machine. I have connection pool on both, compression on both. Same network subnet. Forms authentication (no SSL yet). Can you give me steps on how to troubleshoot where the delays are being inserted or settings in IIS7 that I may have overlooked. Just using defaults. There is only 1 web site on each box. I understand the roles of an Application as defined in IIS has changed. There is no special Application defined in IIS.

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• Apache intermittently aborting requests

  - by Adam Phillips

  I have just been dealing with a problem whereby http requests are being aborted, seemingly at random. On any particular page in the website, when you opened a page, a number of the assets (img, css, etc) failed to load. If you refreshed, the page may work fine, the same set of assets may fail to load or different assets may fail to load. The net tab in firefox was returning 'Aborted' in the HTTP status code column for the failed assets, even tho in the case of images, the image previews were still working. There was nothing in any of the apache logs about the requests that failed, however since it seemed to point to an apache issue, we restarted apache. The first time we tried, it made no difference but about 10 minutes later, in the absence of a better solution we tried again. Bizarrely, the problem disappeared immeadiately. So now the site seems to be running fine again but its rather unsettling, both the intermittent nature of the problem and the lack of an explanation for its resolution. Has anyone seen anything like this before and if so did you find out the reason behind it? Many Thanks

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• Website hosted on my virtualbox web server not displaying images or applying css when viewed through phone

  - by WebweaverD

  I would really appreciate it if someone could help me. Please let me know if you need more info in the comments. My Set Up I have a windows 7 pc. On it I run a virtual box VM with a ubuntu 12 guest os and LAMP setup. I share files between the two machines using samba from linux to windows and using windows file sharing (Workgroup) the other way round. The vm is set up with a bridged network adapter and can happily serve web pages to my host machine. I use DHCP reservations on my home wireless router/modem to reserve an ip for the vm and give it a sitename.dev in my windows host file so I can access it at sitename.dev through the browser. The Problem So far so good but I have a dev project which needs a lot of mobile template development, now obviously I can use a browser plugin to simulate a mobile device but I would like to be able to see the real thing easily on my phone during development. So ideally I would like a similar setup on my iphone to my windows setup Now I'm not great on networking and dont have much experience with web server set up. So when I typed the ip of my virtual box into my iphone i wasnt expecting to see anything. I was pleasantly surprised when my site loaded up. The javascript even seems to be running but the images and css are not happening. My Question 1) What is happening here, is it something to do with the bridged set up on the vm network? 2)How do I make the sites load properly through my phone Notes I've also tried another phone. The same sites viewed on live servers work fine.

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• What kind of hosting do I need? [closed]

  - by Robert Smith

  I have been trying to answer this question but I haven't found an specific answer to my situation. As I want to pay for what I need, I thought I could get a good answer here. I have custom made forum (rather than a built-in forum like the ones you can find as plugins, e.g. WP-Forum or phpBB type of software) in Django. I don't want to use Apache and modwsgi because it's usually very memory-hungry and I can't afford a big server. I prefer a combination of nginx and gunicorn which I think is very efficient (maybe you can also tell me what you think about that). I'm expecting to receive 10,000 to 20,000 visits each month with 15,000 to 30,000 page impressions. I have reviewed some cloud services like Amazon EC2 or Rackspace and other more traditional services (Linodo). This site won't use videos or big images and I certainly don't need a huge amount of bandwidth (200GB would be definitely too much). I need shell access so shared hosting is out of the question. What do I need to run a website like that without problems? What about RAM? 256MB would be enough (that's the amount of RAM offered by small instances in Amazon and Rackspace)? Do you know of any alternative to those I mentioned? If you need more information to provide a useful answer, please don't hesitate to ask. Thanks a lot.

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• Free blog sites where the blogs can (if the template does) validate as XHTML Strict 1.0?

  - by Deleted

  I'm looking for a site where I may register a free blog and have the blog validate as XHTML Strict 1.0. On the surface this may seem like a trivial problem only related to the theme/template in use, but that's unfortunately not the case. One example of a provider which can't fullfill this requirement is Blogger. Altough the pages of the blogs there presents themselfs as XHTML 1.0 Strict it is impossible to actually comply with the requirements inheritied by that markup type in the blog (as the XHTML which is generated by Blogger makes the page as a whole invalid). I've sent a mail to Tumblr to see if it was possible with them, but so far my reply consists of them having forwarded my mail with a "suggestion" to the development department. I don't know if we had a communication error or if I'm actually going to receive a proper answer later. Time will tell. I haven't had time to investigate Tumblr myself, so they may very well be the solution to this problem. To sum things up, I'm looking for any provider: Of a free blog. The blog must have the capability to validate as XHTML Strict 1.0. With capability I mean that the system shouldn't get in the way of creating/using a theme which complies as XHTML Strict 1.0. Preferably is large or at least likely to stay around for a couple of years to come. But I'm willing to take my chances if none of the established providers are up to the task. Thank you for reading! I hope you know of any provider which would be suitable, preferably with proof by linking to a blog there which validates. I'm not looking for suggestions to look into, as there are far to many to investigate and far too little time. If you know of something for sure, I'd be very happy to know about it.

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• Host is missing hostname and/or domain

  - by anlawang

  i use puppet 0.25.4 on ubuntu 10.04,when puppet installed ,i got the infor below : Nov 29 10:30:30 puppet puppetmasterd[4422]: Host is missing hostname and/or domain: pclient.example.com Nov 29 10:30:30 puppet puppetmasterd[4422]: Compiled catalog for pclient.example.com in 0.02 seconds i dont know how to fix it ,who can help me thank you ! my configuration : I use apt-get to install the puppet,so some configuration have been fixed puppet.conf on client : > [main] server=puppet.example.com > logdir=/var/log/puppet > vardir=/var/lib/puppet > ssldir=/var/lib/puppet/ssl > rundir=/var/run/puppet > factpath=$vardir/lib/facter > pluginsync=false > templatedir=$confdir/templates > prerun_command=/etc/puppet/etckeeper-commit-pre > postrun_command=/etc/puppet/etckeeper-commit-post > certname=pclient.example.com > node_name=cert [puppetd] > runinterval=30 puppet.conf on server: > [main] logdir=/var/log/puppet > vardir=/var/lib/puppet > ssldir=/var/lib/puppet/ssl > rundir=/var/run/puppet > factpath=$vardir/lib/facter > pluginsync=true > templatedir=$confdir/templates > prerun_command=/etc/puppet/etckeeper-commit-pre > postrun_command=/etc/puppet/etckeeper-commit-post i user the default node on site.pp i am a newer to puppet,so i dont know the reason for these problems!! thank you again!!!

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• How can I make a copy of a printer in Win7?

  - by hawbsl

  Has anyone been able to copy an existing printer in Win7? I know that we were able to do this in XP (not as a direct copy/paste, but by installing the printer twice) but in Win7 it doesn't seem to be possible. Googling the answer is hopeless because searching for "copy printer" or "duplicate printer" you get a bunch of posts about "printer copiers" or people complaining about duplicate printers getting created in the background (precisely what I'd like to be able to do) It'd be good to know how to do it in general, but if it depends on the printer type, then in our case we are trying to make a copy of an HP Laserjet. Tried installing from the CD - but the CD is too old for Win7 Tried installing via Add Printer and that seems to install the printer but it's marked with an error. Tried installing via the .exe installer from the HP site and that does result in a successful printer being installed, but it won't let you install the same printer twice (stalls on the "insert USB cable now" step - simply won't enable the greyed out "Next" button). The reason this is required is so that we can print to one to the feeder and to the tray separately.

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• debian lenny email server

  - by Dal

  Hi I am a newbie and set up a debian lenny at home and set up the web and email server in the default installation. I followed the instructions for Exim and ran dpkg-reconfigure exim4-config and set it up for mydomainhere.com. I created a one line message file and attempted to test exim by running the command exim [email protected] < msgfile. I also tried using exim4 Exim but i get same error -bash: Exim: command not found. Obviously I am ignorant on how to run exim and test. I also tried to run a php file that sends a test mail and had no success. That script is tested and works fine if I send it from my hosting isp on a different domain. So I know the php script is good. I set up the debian system behind a netgear firewall and uses 192.168.1.x ip . The web server works great and users can visit my site. But I am lack the knowledge on how to get the email working. Appreciate is someone can guide me.

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• Repairing Windows 7 boot after Ubuntu 10.10 install

  - by Ted

  I've read various threads on this after googling, including one on this site. I had Windows 7 installed on an SSD. I wanted to try Ubuntu so I created a partition for it on the SSD and booted with the live CD to install Ubuntu. Went through the install and somehow Ubuntu carved out another partition on the SSD rather than using the one I had already created. Windows 7 would then not boot but Ubuntu would. I booted with my 7 cd and ran the automatic startup repair, it didn't find any problems. I then ran the bootsect command on the drive with 7. It said it repaired the bootmgr but Windows still would not boot and now Ubuntu won't either. I read somewhere else that it may be due to the partition that 7 was on being changed during the install. I don't care about the Ubuntu installation but I don't want to lose the 7 install, can I delete the ubuntu partition through booting with the 7 cd? Will that do any good? Thank you all! I'm stumped even though I've done startup repairs before, just not after Ubuntu install.

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• Hiding my location to websites with region-specific languages/content

  - by Tudor

  I just went to download Microsoft Secority Essentials and it enraged me as it redirected me to a site in my home language and not the default English. If I go to America, I don't want them to speak Swahili. It reminded me of all the other websites who try to do the same. I don't want my content in greek when I'm on vacation! I for one simply can't work on a computer unless the language is English (or unless there's a VERY good reason to change the language). Location aware content is only good for download mirrors, and even then I would rather pick from a list of countries myself. (or if you can't speak anything but your own language) I know websites get your location from your IP and ISP, but is there any way you can inhibit this behaviour on a browser level? Is there any Chrome/Firefox extension for it? Do I really have no choice but to hide my IP? There's all sorts of services that claim they're hiding your IP for free so that people can't log and trace your steps through the internet, but they're probably logging it themselves and making money off it. Why else would they be free? I've found that Firefox has an Option that says "Choose your preferred language when displaying pages". Haven't found anything for Chrome.

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• Are there any other causes of this error that are NOT related to initial setup?

  - by LordScree

  I'm trying to diagnose an issue at a customer site. They are receiving the following error: A network-related or instance-specific error occurred while establishing a connection to SQL Server I've seen this a few times, but only during the initial setup - it's often caused by one of the following: The database server is turned off The network connection between the database server and the application is closed or somehow blocked (e.g. a firewall) The SQL Server instance is not set up to receive remote connections from the application server (e.g. TCP is turned off, remote connections are disabled, or the "SQL Server Browser" service is stopped/disabled) However, if I assume that no configuration changes have been made, I'm trying to postulate on what the reason might be for getting this error at a random point after the initial setup. My initial thought is: SQL Server machine has run out of resources (e.g. RAM) and is unable to accept new requests from the application server Is this a valid theory? What other possible causes are there of this error that are not related to the initial setup of the server / application connection? Or is it simply impossible that this error could occur without a configuration change having been made (either on the SQL Server side, application side, or somewhere in-between (network))? NOTE: I believe this question differs from the plethora of questions related to this error message because the application and server have been talking to each other quite happily until now (most, if not all, other questions seem to relate to initial setup).

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• Scaling a node.js application, nginx as a base server, but varnish or redis for caching?

  - by AntelopeSalad

  I'm not close to being well versed in using nginx or varnish but this is my setup at the moment. I have a node.js server running which is serving either json, html templates, or socket.io events. Then I have nginx running in front of node which is serving all static content (css, js, etc.). At this point I would like to cache both static content and dynamic content to memory. It's to my understanding that varnish can cache static content quite well and it wouldn't require touching my application code. I also think it's capable of caching dynamic content too but there cannot be any cookie headers? I do use redis at the moment for holding session data and planned to use it for other things in the future like keeping track of non-crucial but fun stats. I just have no idea how I should handle caching everything on the site. I think it comes down to these options but there might be more: Throw varnish in front of nginx and let varnish cache static pages, no app code changes. Redis would cache dynamic db calls which would require modifying my app code. Ignore using varnish completely and let redis handle caching everything, then use one of the nginx-redis modules. I'm not sure if this would require a lot of app code changes (for the static files). I'm not having any luck finding benchmarks that compare nginx+varnish vs nginx+redis and I'm too inexperienced to bench it myself (high chances of my configs being awful). I'm basically looking for the solution that would be the most efficient in terms of req/sec and scalable in the future (throw new hardware at the problem + maybe adjust some values in a config = new servers up and running semi-painlessly).

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• How can I rapidly switch hosts?

  - by EAMann

  I'm in the process of migrating a forum setup from one version of the software on one machine (older shared Windows host) to a new VPS (Windows Server 2008). To install the software, I used my hosts file to temporarily point the domain at the new IP address. To see the old site, I obviously re-edit the hosts file to remove the reference. But this leaves me constantly adding/removing a # from my hosts file just so I can switch back and forth between the two servers. Is there a way to do this more rapidly? I've found a handful of toggling batch scripts, but all they do is automate the addition/removal of the # character ... so there's still a noticeable lag where I have to repeatedly hit F5 to force my system to detect the new settings. Ideally, I could view both servers at the same time on the same machine. Maybe one through a regular browser session and one through some kind of a proxy. Unfortunately, I don't have the first idea how to set that up. Ideas?

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