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Appropriate Network switch for small server cluster

- by Chris Dutrow

Need to build a small business server cluster for the purpose of crunching data. It will not host a web site that needs to be available 24/7. It does need to support servers that host Redis, a Cassandra database cluster, and a Python web server. Operating system will most likely be Centos 6.4 Other servers in the cluster should be able to communicate very fast with each other, especially the Redis server. This will probably require the use of internal IP addresses. We will need to use multi-data center replication to synchronize the Cassandra cluster with the one that we currently have hosted on the cloud Was looking into network switches and we are unsure of the appropriate specifications that we should be looking for. Does the switch need to be "managed" or can it be "unmanged"? Does the switch need to support IPv6 or just IPv4? Do we need an enterprise level Cisco switch, or can we go with something like a $200 DLink managed (or unmanaged) small business switch? Thanks so much!

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How do I force a specific MTU for only certain TCP ports?

- by Dave S.

Background I have a set of embedded hardware deployed in the field. These remote machines connect back to my servers at AWS running Ubuntu and I use the iptables mangle chain to lower the MTU to 500 so these devices are happy. For reference, this is the iptables rule I am using: -A POSTROUTING -p tcp --sport 12345 --tcp-flags SYN,RST SYN -o eth0 -j TCPMSS --set-mss 500 Current Problem I'm trying to spin up some servers on the Joyent Cloud using SmartOS, but I can't find any information on selectively changing the MTU like I can on Linux (e.g. all info I've found is on changing it globally, which is not what I want). How would I do it so that all connections on TCP port 12345 get the MTU I want?

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How do I negotiate for colo space?

- by randy melder

I guess this isn't a technical question, but it definitely is something IT teams deal with, so here goes: I'm looking at getting a rack at a local colocation facility. I'm weighing the options versus building out in a cloud platform. We are REALLY low bandwidth and power. There's a total of six hosts for the total operation. You can assume we use <= 10 amps of power and <= 2Mbps 95th percentile. Do you have any advice for getting the best deal?

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jQuery pop up problems

- by user327137

Hi all, I am creating a site from a template i purchased from TM for a beauty salon! I want to create an online booking form with the validations of name number service type but i'm having trouble getting a link to open that will pop up also using jquery NOT html how do i fix this... what is the code i have to insert so that when you click "BOOK NOW" a jquery pop up appears in the centre of the page and it has a booking form on it.... i have googled and googled but it is all new to me as in a NOOB at jquery.... here is a live demo of the template (template link for demo http://osc4.template-help.com/wt_31562/index.html#) and here is the code for where i am trying to place a pop up jquery <dt class="dt3"><a href="#"></a><img src="images/shadow.png" alt="" class="shadow"></dt> <dd id="page3"> <div class="inner"> <div class="content"> <section class="col-1"> <h2>our services</h2> <p>Vintage Beauty</p> <p class="dark">We offer Free Consultation for Botox, Fillers, Medical Skin Peels, Cosmetic Surgery <br> & also specialise n body and skin care. </p> <img src="images/page2-img1.png" alt="" class="p2"> <a href="#" class="more">view more</a> </section> <section class="col-2"> <h2>services</h2> <ul class="list p2"> <li><a href="#">Fish Pedicures</a></li> <li><a href="#">Manicures</a></li> <li><a href="#">Pedicures</a></li> <li><a href="#">Waxing</a></li> <li><a href="#">Threading</a></li> <li><a href="#">Tanning</a></li> <li><a href="#">Body Massage</a></li> <li><a href="#">Nail/Eye Extensions</a></li> <li><a href="#">Eye Lash/Brow Tinting</a></li> <li><a href="#">Twinkle Toes</a></li> <li><a href="#">Teeth Whitening Kits</a></li> <li><a href="#">Hot Wax Specialists</a></li> </ul> **<a href="#" class="more">BOOK ONLINE NOW</a> </section>** </div> </div> </dd>

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Storing Cards and PCI Compliance

- by Nimbuz

I'm developing a SaaS service and will be managing payments as a merchant for customers, and since we'll be using multipe payment processors depending on users location, amount and other factors so its important to store card details. I did some research and from what I understood all you need is a PCI compliant host (VPS, Dedicated or Private Cloud) and get it validated and certified through some provider like TrustWave etc... Is that correct or am I missing something? Also, would be great if you could suggest a few (not necessasrily cheap, but affordable) PCI compliant hosts. Many thanks

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Building a modular Website with Zend Framework: Am I on the right way?

- by Oliver

Hi, i´m a little bit confused by reading all this posts an tutorials about staring with Zend, because there a so many different ways to solve a problem. I only need a feedback about my code to know if iam on the right way: To simply get a (hard coded) Navigation for my side (depending on who is logged in) i build a Controller Plugin with a postDispatch method that holds following code: public function postDispatch(Zend_Controller_Request_Abstract $request) { $menu = new Menu(); //Render menu in menu.phtml $view = new Zend_View(); //NEW view -> add View Helper $prefix = 'My_View_Helper'; $dir = dirname(__FILE__).'/../../View/Helper/'; $view->addHelperPath($dir,$prefix); $view->setScriptPath('../application/default/views/scripts/menu'); $view->menu = $menu->getMenu(); $this->getResponse()->insert('menu', $view->render('menu.phtml')); } Is it right that i need to set the helper path once again? I did this in a Plugin Controller named ViewSetup. There i do some setup for the view like doctype, headlinks, helper paths...(This step is from the book: Zend Framework in Action) The Menu class which is initiated looks like this: class Menu { protected $_menu = array(); /** * Menu for notloggedin and logged in */ public function getMenu() { $auth = Zend_Auth::getInstance(); $view = new Zend_View(); //check if user is logged in if(!$auth->hasIdentity()) { $this->_menu = array( 'page1' => array( 'label' => 'page1', 'title' => 'page1', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page1')) ), 'page2' => array( 'label' => 'page2', 'title' => 'page2', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page2')) ), 'page3' => array( 'label' => 'page3', 'title' => 'page3', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page3')) ), 'page4' => array( 'label' => 'page4', 'title' => 'page4', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page4')) ), 'page5' => array( 'label' => 'page5', 'title' => 'page5', 'url' => $view->url(array('module' => 'pages','controller' => 'my', 'action' => 'page5')) ) ); } else { //user is vom type 'client' //.. } return $this->_menu; } } Here´s my view script: <ul id="mainmenu"> <?php echo $this->partialLoop('menuItem.phtml',$this->menu) ?> </ul> This is working so far. My question is: is it usual to do it this way, is there anything to improve? I´m new to Zend and in the web are many deprecated tutorials which often is not obvious. Even the book is already deprecated where the autoloader is mentioned. Many thanks in advance

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apache running but site not accessible

- by Shyam

Am pretty new to server administration. So I am not able to get to the root of the problem. I am running Apache2 with mod_php on a 1GB Rackspace Cloud Server (Ubuntu 9.10). My site goes down often, and I have to restart apache2 to get the site working. I checked the "error.log" file. There were no signs of any error messages. I even searched for words like [error] / error / warn / [warn] . But no results. The site goes down and even then apache is running. When the site was down, the checked the status /etc/init.d/apache2 status and it gave ** * Apache is running (pid 433). ** Any suggestions where I should look for the problem. Thanks a lot.

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Serve my website from different server during downtime

- by nfedyashev.mp

I have a VPS server running in the cloud. Fully automated server image upgrade/downgrade(by RAM/HDD plans). The problem is that server upgrade/downgrade takes time and involves total unavailability during this period(up to 30 minutes). Goal: during this downtime server my website(http://mydomain.here) from different server with some message like "Under construction". How can I do this? -- mydomain.here is hosted on godaddy and uses its DNS(If I call it right). It's pointing with A-record to my VPS's IP address now. Change in these DNS settings will take more than 30minutes, so it's not an option. How can I find mode "dynamic" DNS? What should I learn?

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How can I install Gentoo on Virtual Box//(Ubuntu 12.04)

- by Curious Apprentice

I'm googling for a while about how can I install Gentoo on Virtual Box. The hand book provides less information about installing it on virtual box rather on a real partition. I thought there will be a GUI tool to install Gentoo. [Now I think there is not :(] Whenever I'm booting into gentoo Im going into a LiveDVD environment where fdisk returning "command not found !" (Not sure this is a bug or Im using a wronng command) Now Im not a very exprienced user but do like to learn and play with Gentoo. Any help link will be appriciated. Downloaded File: livedvd-x86-amd64-32ul-2012.iso (Do I need to use Gentoo 64 as OS version in Virtual Box ?)

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Memory management (segmentation and paging) in 80286 and 80386: How does it work?

- by Andrew J. Brehm

I found lots of Web sites and books explaining how memory management worked on the 8086 and later x86 CPUs in Real Mode. I understand, I think, how two 16 bit values, segment address and offset are combined to get a linear 20 bit physical address (shift segment four bits to the left, add offset; segments are 64K and start every 16 bytes). But I couldn't find any good Web sites or books that explained how memory management works in Protected Mode, specifically the differences between 80286 and 80386. Can anyone point me to a good Web site or book (or explain it right here)? (For extra credit, i.e. an upvote, how does it work in Long Mode?)

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Three apps going through apache. How to configure apache httpd?

- by Chris F.

I have a quick question but I've been struggling to find the best solution: I have two java webapps and wordpress (php) that I need to serve through my Prod website: App #1 should be accessed when pointing to www.example.com/ (this would have other url too such as "www.example.com/book") App #2 should be accessed when pointing to www.example.com/manage Finally WordPress would be accessed at www.example.com/info How can I configure apache to serve all these three instances at the same time? So far I have and it's not quite working right. Any suggestions would be much appreciated! Listen 8081 <VirtualHost *:8081> DocumentRoot /var/www/html </VirtualHost> ProxyPass /manage http://127.0.0.1:8080/manage ProxyPassReverse /manage http://127.0.0.1:8080/manage ProxyPass /info http://127.0.0.1:8081/info ProxyPassReverse /info http://127.0.0.1:8081/info ProxyPass / http://127.0.0.1:9000/ ProxyPassReverse / http://127.0.0.1:9000/

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Blackberry Won't Sync: Says Processing

- by Noah

I have a blackberry storm 2 and I have it set up to sync, just like I've done with all the other ones in the company. They pull the address book/contacts from outlook, and aren't synced to an exchange server. I have everything setup and then when I hit synchronize it flashes "processing" the phone shows it trying to sync and then it is done in less than a second. It did warn me that the computer was not supplying enough power to charge the device and it said that I should make sure the drivers are correct. Also, I was warned that the device might not function properly down in the bottom right hand corner. Any ideas? I've uninstalled and reinstalled the blackberry software off the disc.

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Python 2.7 list of lists manipulation functionality

- by user3688163

I am trying to perform several operations on the myList list of lists below and am having some trouble figuring it out. I am very new to Python. myList = [ ['Issue Id','1.Completeness for OTC','Break',3275,33,33725102303,296384802,20140107], ['Issue Id','2.Validity check1 for OTC','Break',3308,0,34021487105,0,20140107], ['Issue Id','3.Validity check2 for OTC','Break',3308,0,34021487105,0,20140107], ['Issue Id','4.Completeness for RST','Break',73376,1,8.24931E+11,44690130,20140107], ['Issue Id','5.Validity check1 for RST','Break',73377,0,8.24976E+11,0,20140107], ['Liquidity','1. OTC - Null','Break',7821 0,2.28291E+11,0,20140110], ['Liquidity','2. OTC - Unmapped','Break',7778,43,2.27712E+11,579021732.8,20140110], ['Liquidity','3. RST - Null','Break',335120,0,1.01425E+12,0,20140110], ['Liquidity','4. RST - Unmapped','Break',334608,512,1.01351E+12,735465433.1,20140110], ['Liquidity','5. RST - Valid','Break',335120,0,1.01425E+12,0,20140110], ['Issue Id','1.Completeness for OTC','Break',3292,33,32397924450,306203929,20140110], ['Issue Id','2.Validity check1 for OTC','Break',3325,0,32704128379,0,20140110], ['Issue Id','3.Validity check2 for OTC','Break',3325,0,32704128379,0,20140110], ['Issue Id','4.Completeness for RST','Break',73594,3,8.5352E+11,69614602,20140110], ['Issue Id','5.Validity check1 for RST','Break',73597,0,8.5359E+11,0,20140110], ['Unlinked Silver ID','DQ','Break',3201318,176,20000000,54974.33386,20140101], ['Missing GCI','DQ','Break',3201336,158,68000000,49351.9588,20140101], ['Missing Book','DQ Break',3192720,8774,3001000000,2740595.484,20140101], ['Matured Trades','DQ','Break',3201006,488,1371000000,152428.8348,20140101], ['Illiquid Trades','1.Completeness Check for range','Break',43122,47,88597695671,54399061.43,20140107], ['Illiquid Trades','2.Completeness Check for non','Break',39033,0,79133622401,0,20140107] ] I am trying to get the result below but do not know how to do so: newList = [ ['Issue Id','1.Completeness for OTC:2.Validity check1 for OTC:3.Validity check2 for OTC','Break',3275,33,33725102303,296384802,20140107], ['Issue Id','4.Completeness for RST:5.Validity check1 for RST','Break',73376,1,8.24931E+11,44690130,20140107], ['Liquidity','1. OTC - Null','Break:2. OTC - Unmapped','Break',7821 0,2.28291E+11,0,20140110], ['Liquidity','3. RST - Null:4. RST - Unmapped:5. RST - Valid','Break',335120,0,1.01425E+12,0,20140110], ['Issue Id','1.Completeness for OTC:2.Validity check1 for OTC:3.Validity check2 for OTC','Break',3292,33,32397924450,306203929,20140110], ['Issue Id','4.Completeness for RST:5. RST - Valid','Break',73594,3,8.5352E+11,69614602,20140110], ['Unlinked Silver ID','DQ','Break',3201318,176,20000000,54974.33386,20140101], ['Missing GCI','DQ','Break',3201336,158,68000000,49351.9588,20140101], ['Missing Book','DQ Break',3192720,8774,3001000000,2740595.484,20140101], ['Matured Trades','DQ','Break',3201006,488,1371000000,152428.8348,20140101], ['Illiquid Trades','1.Completeness Check for range','Break',43122,47,88597695671,54399061.43,20140107], ['Illiquid Trades','2.Completeness Check for non','Break',39033,0,79133622401,0,20140107] ] Rules to create newList. Create a new list in the newList list of lists if the values in the lists meet the following conditions: multiple lists that match on `myList[i][0]` and `myList[i][7]` but with have (1) sums of `myList[i][3]` and `myList[i][4]` and (2) sums of `myList[i][5]` and `myList[i][6]` that are different from each other are just listed as is in newList if multiple lists match on both `myList[i][0]` (this is the type) and `myList[i][7]` (this is the date) are the same then create a new list for each set of lists with mathcing `myList[i][0]` and `myList[i][7]` that have (1) sums of `myList[i][3]` and `myList[i][4]` and (2) sums of `myList[i][5]` and `myList[i][6]` that are different from the other lists with mathcing `myList[i][0]` and `myList[i][7]`. I also am trying to concatenate `myList[i][1]` separated by a ':' for all those lists with matching `myList[i][0]` and `myList[i][7]` and with sums of `myList[i][3]` + `myList[i][4]` and `myList[i][5]` + `myList[i][6]` that match. So essentially for this case only those lists in `myList` with sums of `myList[i][3]` + `myList[i][4]` and `myList[i][5]` + `myList[i][6]` are different from the other lists are then listed in newList. The above newList illustrates these results I am trying to achieve. If anyone has any ideas how to do this they would be greatly appreciated. Thank you!

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How long does badblocks take on a 1TB drive?

- by Steven Don

I'm running badblocks (or rather "e2fsck -c") on a 1TB drive and if the progress indicator is any indication (no pun intended), it's going to take almost forever to complete. Right now it says 0.01% done, 30:20 elapsed which would mean the thing would take 17 weeks or so to complete, which seems rather excessive in my book. Is that a normal amount of time for such a check to take or it simply that my suspicions are correct in that the drive is failing, thus causing the check to take only slightly shorter than eternity? I found this question here, but that pertains to the amount of passes done.

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Is there a limit on the number of USB external drives?

- by Beska

I've got three external HDDs, all My Books, 500 GB, 750 GB, and 1 TB. If I hook one or two of them up to a computer, everything seems fine. If I hook all three of them to a computer (I've tried this on two different computers, one running Windows XP, one running Windows Vista), the bootup time goes up by more than an order of magnitude. It can suddenly take about 10-20 minutes to boot the machine, whereas before it might take a minute. All three drives work fine on their own. I'm not using any kind of hub; all three are plugged directly into the machine. Is this associated with some kind of inherent limit in USB? Is this bad hardware design in the CPU box? Is this a My Book problem?

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Burn iTunes playlist to Audio Image

- by MikeHoss

I have Snow Leopard on an early model MacBook Pro. The CD Drive has been giving me fits the last few months -- I stick a blank CD in it, and it claims it's bad and spits it out. I can go through a pile of brand-new CD's and it will choose 1 out of 7 that it wants to use, even though all the CD's come from the same package. The rejected CD's work fine on a Linux machine I have. I need to burn an audio CD from iTunes and my thought was: Burn playlist to audio CD Image file (Red Book image?) Copy ISO file to Linux Machine Use Linux machine to burn audio image to a CD But looking around, it doesn't seem that iTunes on OSX will support this. I was wondering if anyone else has accomplished this.

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How to slave a 3.5" 500gb sata external hdd(Western Digital) to my dell Inspiron laptop

- by AJ HDD

i have a 3.5" western digital my book 500gb external hdd....i gave it to a friend of mine and he broke the usb port in it...i went to a nearby comp repair shop and had him solder the thing...it didnt detect when i plugged it in my dell inspiron laptop........i recently saw about the 3.5" sata to usb enclosure, so i went to check it....strangely when its placed in the enclosure, its not detecting in windows...also when it was put as secondary(im guessing slave) to the shop fellow's desktop it shows up in the bios and starting, but then again doesnt show in windows 7, and the guy told me i need to data recovery to get teh data back p.s.the wd hdd doesnt have os, just data, soo my question is: can i slave the drive to my dell laptop and try to recover the data....if so how? please i would really appreciate it...thanks in advance

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Are there any ebook readers for Win 7 Pro which can display two books side-side?

- by verve

I'm trying to learn a language and I want to be able to open the English version of a book and the German one together on the screen to compare etc.I'm particularly interested in displaying Kindle-typebooks side-by-side. I need software that is simple to use and not-too-ugly looking. Ha. Aesthetics seem to matter to me when I'm learning...or, any reader that can display ANY popular ebook formats in parallel form will do! Win 7. IE 9. Freeware or not.

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Developing and implementing a testing plan for a software app deployed on a web server

- by Abhzoo

A company in the USA is building a new Web App that will be offered SaaS to customers and the development is being done by a software development team located in a different country(India). They are about to take delivery of a first demo to provide live feedback to the team in India. The overseas team requires a cloud server (Windows + SQL Standard, 8GB Ram, 8 vCPUs, 40GB SSD system disk, 80GB SSD data disk, 1600Mb/s network bandwidth) to serve as a tester server. When the tester is setup the team will install the app on the test server to get live feedback. Q:Explain in detail how you will develop and implement a testing plan for the software App. Be sure to explain the specifics. PLEASE HELP, NEED ANSWER ASAP

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Best practice for ONLY allowing MySQL access to a server?

- by Calvin Froedge

Here's the use case: I have a SaaS system that was built (dev environment) on a single box. I've moved everything to a cloud environment running Ubuntu 10.10. One server runs the application, the other runs the database. The basic idea is that the server that runs the database should only be accessible by the application and the administrator's machine, who both have correct RSA keys. My question: Would it be better practice to use a firewall to block access to ALL ports except MySQL, or skip firewall / iptables and just disable all other services / ports completely? Furthermore, should I run MySQL on a non-standard port? This database will hold quite sensitive information and I want to make sure I'm doing everything possible to properly safeguard it. Thanks in advance. I've been reading here for a while but this is the first question that I've asked. I'll try to answer some as well = )

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What we have to measure for measuring server performance If we can't measure the server processing time from client side?

- by AsadYarKhan

If we can not measure the server processing time from client side then which attributes will be good to measure in client side for measuring server side performance and What attributes are important ? I know we can get the server response time, latency and Throughput etc,but how do we understand/interpret the result of server side from these attrubutes. How can we analyse that whether my code is taking lots of time,whether Web Server, whether it is because of Server Machine(H/W).how would i know that which thing needs to be upgrade or improve.Please tell me any article or any book something that I need to study or explain here If you can so I can interpret the result of server side using these attributes response time, latency and throughput.You can tell other performance attribute if I need to understand the server result.

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Font display issue (Mac OS X)?

- by avenas8808

I used a font manager on Mac OS X, for additional fonts in my graphic design projects without installing them to the fonts folder (I think that's how it works) - using Font Book and Font Explorer X Version 1.2.3 on OS X 10.6. Most fonts work fine, but Interstate has a problem: Interstate Regular is installed, but for some reason it's probably not seeing it; it's seeing all the Bold and Condensed versions fine. In the above image, it displays the second font as Interstate Regular, but it isn't that font... why? Also, how do I reset the system fonts folder back to the default-installed fonts (I think it's in the library folder) if worst comes to worst, and is using a font manager on Mac or Windows a good idea? I don't want to wreck my system, fairly new to using Mac, especially OS X, so any help would be gratefully accepted.

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Web Filter For Multiple Networks

- by Rob

I have been using a Barracuda web filter 310 in our network and I have just had enough of it. It does not support trunking and we have several networks that have users that need to be web filtered. (I guess if everyone just did their flippin jobs I would not have this issue) but the management wants me to get it resolved. Does anyone know the top five web filters that are better than the barracuda web filters that support network trunking so that I can have multiple domains and subnets going through it? Thanks in advance - everyone on this site is gold in my book!

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Virtual MS Sql Server not consuming enough CPU

- by rocketman

We have a Win2008 server 32 bit running as a virtual machine under ESX server. It has 6 CPU cores of 2Gz each and 4GB ram. It's running MS Sql Server 2008 R2 only. Problem: The server is heavily loaded and responds slowly. From windows taskmanagers point of view, it really looks overloaded, CPU wise. However, our external "cloud manager" says it's only using 2.5GHz worth of CPU-cycles in the cluster. I/O times looks "good". We have already tried to set the SQL servers number of working threads from 0(auto) to 256, to no effect. How to tune the VM host, guest or SQL to use all of it's alotted resources? Does it sound possible att all?

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Backing up a Linux VPS with RSync to Vista

- by Frank

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

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