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• Online file storage similar to Amazon S3

  - by Joel G

  I am looking to code a file storage application in perl similar to amazon s3. I already have a amazon s3 clone that I found online called parkplace but its in ruby and is old also isn't built for high loads. I am not really sure what modules and programs I should use so id like some help picking them out. My requirements are listed below (yes I know there are lots but I could start simple then add more once I get it going): Easy API implementation for client side apps. (maybe RESTful but extras like mkdir and cp (?) Centralized database server for the USERDB (maybe PostgreSQL (?). Logging of all connections, bandwidth used, well pretty much everything to a centralized server (maybe PostgreSQL again (?). Easy server side configuration (config file(s) stored on the servers). Web based control panel for admin(s) and user(s) to show logs. (could work just running queries from the databases) Fast High Uptime Low memory usage Some sort of load distribution/load balancer (maybe a dns based or pound or perlbal or something else (?). Maybe a cache of some sort (memcached or parlbal or something else (?). Thanks in advance

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• How does Amazon's Statistically Improbable Phrases work?

  - by ??iu

  How does something like Statistically Improbable Phrases work? According to amazon: Amazon.com's Statistically Improbable Phrases, or "SIPs", are the most distinctive phrases in the text of books in the Search Inside!™ program. To identify SIPs, our computers scan the text of all books in the Search Inside! program. If they find a phrase that occurs a large number of times in a particular book relative to all Search Inside! books, that phrase is a SIP in that book. SIPs are not necessarily improbable within a particular book, but they are improbable relative to all books in Search Inside!. For example, most SIPs for a book on taxes are tax related. But because we display SIPs in order of their improbability score, the first SIPs will be on tax topics that this book mentions more often than other tax books. For works of fiction, SIPs tend to be distinctive word combinations that often hint at important plot elements. For instance, for Joel's first book, the SIPs are: leaky abstractions, antialiased text, own dog food, bug count, daily builds, bug database, software schedules One interesting complication is that these are phrases of either 2 or 3 words. This makes things a little more interesting because these phrases can overlap with or contain each other.

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• Amazone API ItemSearch returns (400) Bad Request.

  - by BuzzBubba

  I'm using a simple example from Amazon documentation for ItemSearch and I get a strange error: "The remote server returned an unexpected response: (400) Bad Request." This is the code: public static void Main() { //Remember to create an instance of the amazon service, including you Access ID. AWSECommerceServicePortTypeClient service = new AWSECommerceServicePortTypeClient(new BasicHttpBinding(), new EndpointAddress( "http://webservices.amazon.com/onca/soap?Service=AWSECommerceService")); AWSECommerceServicePortTypeClient client = new AWSECommerceServicePortTypeClient( new BasicHttpBinding(), new EndpointAddress("http://webservices.amazon.com/onca/soap?Service=AWSECommerceService")); // prepare an ItemSearch request ItemSearchRequest request = new ItemSearchRequest(); request.SearchIndex = "Books"; request.Title = "Harry+Potter"; request.ResponseGroup = new string[] { "Small" }; ItemSearch itemSearch = new ItemSearch(); itemSearch.Request = new ItemSearchRequest[] { request }; itemSearch.AWSAccessKeyId = accessKeyId; // issue the ItemSearch request try { ItemSearchResponse response = client.ItemSearch(itemSearch); // write out the results foreach (var item in response.Items[0].Item) { Console.WriteLine(item.ItemAttributes.Title); } } catch(Exception e) { Console.ForegroundColor = ConsoleColor.Red; Console.WriteLine(e.Message); Console.ForegroundColor = ConsoleColor.White; Console.WriteLine("Press any key to quit..."); Clipboard.SetText(e.Message); } Console.ReadKey(); What is wrong?

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• Scalability 101: How can I design a scalable web application using PHP?

  - by Legend

  I am building a web-application and have a couple of quick questions. From what I learnt, one should not worry about scalability when initially building the app and should only start worrying when the traffic increases. However, this being my first web-application, I am not quite sure if I should take an approach where I design things in an ad-hoc manner and later "fix" them. I have been reading stories about how people start off with an app that gets millions of users in a week or two. Not that I will face the same situation but I can't help but wonder, how do these people do it? Currently, I bought a shared hosting account on Lunarpages and that got me started in building and testing the application. However, I am interested in learning how to build the same application in a scalable-manner using the cloud, for instance, Amazon's EC2. From my understanding, I can see a couple of components: There is a load balancer that first receives requests and then decides where to route each request This request is then handled by a server replica that then processes the request and updates (if required) the database and sends back the response to the client If a similar request comes in, then a caching mechanism like memcached kicks into picture and returns objects from the cache A blackbox that handles database replication Specifically, I am trying to do the following: Setting up a load balancer (my homework revealed that HAProxy is one such load balancer) Setting up replication so that databases can be synchronized Using memcached Configuring Apache to work with multiple web servers Partitioning application to use Amazon EC2 and Amazon S3 (my application is something that will need great deal of storage) Finally, how can I avoid burning myself when using Amazon services? Because this is just a learning phase, I can probably do with 2-3 servers with a simple load balancer and replication but until I want to avoid paying loads of money accidentally. I am able to find resources on individual topics but am unable to find something that starts off from the big picture. Can someone please help me get started?

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• "Ubuntu : un logiciel espion" pour Richard Stallman, qui s'insurge contre l'intégration de la recherche Amazon dans l'OS

  « Ubuntu : un logiciel espion » pour Richard Stallman le père de GNU estime que l'intégration de la recherche Amazon dans l'OS est préjudiciable au libre La version la plus récente d'Ubuntu (12.10 Quetzal Quantal) intègre une fonctionnalité polémique permettant d'afficher des suggestions de produits à acheter sur Amazon aux utilisateurs. Concrètement, lorsque l'utilisateur lance une recherche d'un fichier, une application, etc. (en local ou sur le Web) à partir de son bureau, des liens de suggestions Amazon vers des sujets rattachés aux mots-clés saisis apparaissent avec les résultats. Bien que cette fonctionnalité soit un moyen pour Canonical de financer le projet, elle e...

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• (Amazon AWS) EBS mount error: Stale NFS file handle

  - by May

  I have an EC2 instance that just went offline (cannot even be pinged) but is still reflected as operational. In an effort to retrieve data stored on an attached EBS, I did a forced detach of the mounted volume, launched a new instance, and tried attaching the EBS volume. However, I keep getting an error - mount: Stale NFS file handle whenever I do so. Did I just lose all my files?

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• Automated incremental backups from Plesk on Centos to Amazon S3

  - by ChrisS

  Hi, I've done a far bit of research on this via Google and there seems to be quite a few ways of possibly doing this. I'm looking to incrementally backup new and updated files in two directories on my Plesk run Centos 5.2 server: /backups and /var/www/vhosts (preferable only httdocs within each vhost) Has anyone got some great feedback from using the various solutions - seems to be various Java, Perl and Ruby based solutions out there. Many thanks, Chris

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• Start jade via batch script as service on windows server 2012 amazon ec2 instance

  - by E. Lüders

  I would like to start the Jade agent platform with a batch script on an windows server ec2 instance as a service. The reason for this is, that I want to start jade automatically at system startup. For creating the service I use nssm. However so far its working fine and the service is created. When I want to start the service I get an error message: Windows could not start the NAME service on Local Computer. The service did not return an error... My batch file contains only one line: java jade.Boot -platform-id P%random% If i execute the script via cmd it works fine. Anybody got an idea why this is not working if I start the batch script as a service?

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• Redirecting specific traffic to amazon AWS

  - by yoav r

  My server has recieved sudden increase in the (read) web traffic, requesting many map image tiles, and apache cannot handle it. Apache cannot even handle the redirections! The average load I get in my CentOS machine is more then 200.. Is there some software out there that can redirect SOME of the traffic, such as only the traffic from specific directory (such as http://example.com/maptiles/abc.png) to a different address (sucha as http://s3.amazonaws.com/mytiles/abc.png) ? can this be done by HAProxy?

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• Les e-Redears sont complémentaires des tablettes PC pour Amazon, qui révèle que le Kindle est sa meilleure vente de tous les temps

  Les e-Redears sont complémentaires des tablettes PC Pour Amazon, qui révèle que sa meilleure vente de tous les temps est le Kindle Lorsque nous parlions d'un Noël Geek, nous ne croyions pas si bien dire. Pour la plus grande joie d'Amazon, la fête a été l'occasion pour de nombreux utilisateurs de se procurer un Kindle, son e-reader maison. Et par « nombreux », il faut comprendre très nombreux puisque Amazon révèle que son lecteur électronique est devenu la meilleure vente de tous les temps de la plateforme. Pour la petite histoire, le Kindle détronne le dernier tome de Harry Potter.

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• Amazon Web Services : mise à jour de l'environnement Linux, avec les dernières versions de MySQL, Python, Ruby et le Kernel 3.2

  Amazon Web Services : mise à jour de l'environnement Linux avec les dernières versions de MySQL, Python, Ruby et le Kernel Linux 3.2 Amazon Web Services (AWS) vient de procéder à une mise à jour majeure d'Amazon Linux AMI. L'image du système d'exploitation Linux qui s'exécute sur la plateforme intègre désormais les versions les plus récentes de TomCat, MySQL, Python, GCC, Ruby, etc. Cette version a été construite avec pour objectif principal de permettre aux entreprises de migrer ou de rester sur les anciennes versions des outils. Ainsi, les organismes peuvent exécuter différentes versions majeures des applications et langages de programmation. Ceci permet au code qui s'appuie su...

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• Cloud : suppression des coûts de transferts de données pour les plates-formes Windows Azure et Amazon Web Services

  Cloud : suppression des coûts de transferts des données Pour les plates-formes Windows Azure et Amazon Web Services Amazon a annoncé la suppression des frais sur tous les transferts de données sur sa plate-forme Cloud Amazon Web Services (AWS). Cette suppression vise à convaincre certaines entreprises préoccupées par le coût des migrations vers le Cloud liés aux quantités importantes de données. Les utilisateurs pourront donc up-loader des petaoctes de données sans avoir à payer des frais supplémentaires. La décision est valable pour le transfert de données dans n'importe quelle région et pour n'importe quel service d'AWS. En plus de la suppression des couts de trans...

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• Postgres + OpenStreeMap Amazon snapshot

  - by user32425

  Hi, I am trying to start my postgres using /etc/init.d/postgresql-8.3 start but I got this * Starting PostgreSQL 8.3 database server * Error: The server must be started under the locale : which does not exist any more. ...fail! I tried the solution in http://ubuntuforums.org/archive/index.php/t-397005.html but it still does not work. How can I fix this? Thanks

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• Why can I resolve this hostname but not a cname to this hostname?

  - by Joe Hopfgartner

  if a run dig against a hostname, i get the according cname, however i get an NXDOMAIN error (non existent domain). if i run dig against the cname i got, I can resolve it to an IP address successfully. It is reproduceable. On the system I am currently on it is always the case, on other systems it sometimes works and sometimes not, and on other systems it seems to work all the time. If i run using a nameserver i specify (for example googles public nameserver) i can successfully resolve the hostname. i would just blame the local system, but it seems i am not having the only one problems the 2nd domain (unrestrict.me) is hosted on amazon route 53 nameservers. the 1st one on another dns server which has proofen to be fully functional and reliable over the years. i once switchted with the other domain to amazon dns as well, everything seemed to work, also various dns health check tests reported fine, however i recieved a lot of support tickets that dns resolution would not work. is amazon just "bad" or am i doing something wrong? i did not tamper with the domain in any way on the local system (in case of caching or making a custom dns view or whatever...) joe@joe:~$ dig scorpion.premiumize.me ; <<>> DiG 9.8.1-P1 <<>> scorpion.premiumize.me ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 10222 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;scorpion.premiumize.me. IN A ;; ANSWER SECTION: scorpion.premiumize.me. 180 IN CNAME alpha.nue.scorpion.unrestrict.me. ;; Query time: 28 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Mon Jun 18 10:28:39 2012 ;; MSG SIZE rcvd: 84 joe@joe:~$ dig alpha.nue.scorpion.unrestrict.me ; <<>> DiG 9.8.1-P1 <<>> alpha.nue.scorpion.unrestrict.me ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 25381 ;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;alpha.nue.scorpion.unrestrict.me. IN A ;; ANSWER SECTION: alpha.nue.scorpion.unrestrict.me. 300 IN A 78.46.25.130 ;; Query time: 48 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Mon Jun 18 10:28:47 2012 ;; MSG SIZE rcvd: 66 joe@joe:~$

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• amazon cloud vs rackspace cloud [closed]

  - by machaa

  Hi, I'm looking to take a dedicated server - in the process I read about Amazon Cloud computing & Rackspace Cloud Servers. Now I'm not sure which one to opt? Could somebody suggest - Performance & Price wise. Regards

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• Raik vs Amazon SimpleDB

  - by Fedrick

  Hi, I am looking for an eventually consistent key value data store and i decided to choose between Amazon SimpleDB and Riak ,so can anyone share their valuable experiences comparing both . Thanks in advance Fedrick

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• Asynchronous message queues and processing like Amazon Simple Queue service in django

  - by becomingGuru

  There are many activities on an application that need things like: Send email, Post to twitter thumbnail an image, into several sizes call a cron to find connected relationships A good way to do these tasks is to write into an asynchronous queue on which operations are performed. What django application can be used to implement such functionality, as the one Amazon Simple Queue service offers, locally? I have come across celery. Right thing? Anything else that exists, like this?

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• QueryPerformanceCounter Not Working Properly on Amazon EC2 with Win Server 2008

  - by timeitquery

  Our application makes use of QueryPerformanceCounter to measure timings. When running it on Amazon EC2 instances we are noticing number that are out of whack. The symptoms look very similar to what has been reported with virtualized machines on HP proreliant servers, however all the articles state that this was not the case for Windows Server 2008. The articles recommended modifing the boot.ini to /USEPMTIMER - however, this seem to be missing from the documentation on bcdedit - which replaced boot.ini

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• Making a Ligthing Flash Magento store with Nginx on AWS Elastic Beanstalk with Minimum Resource Utilization

  - by Junaid

  I'm going to install Magento on AWS Elastic Beanstalk t1.micro (free tier), on Windows or Linux + Nginx + Php-fpm + eAccelerator, CDN (cloudfront), MemcacheD. I will ask my developer to make my website as fast as it can be with as much as possible, minimum AWS utilization. My webstore will have <1000 SKUs and I'm not expecting the traffic without going into thorough SEO/PPC. Now I have three questions: Do I really need Nginx microcaching along with eaccelerator? Do I need AWS Elastic Load Balancer with t1.micro tier for the sake of scalability (as I have heard that magento is resource hungry application, may fully utilize t1.micro AMI) or can I replace AWS ELB with Nginx load balancer? In AWS Elastic Beanstalk?

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• Intermittent Windows Server 2008 BSOD and restart

  - by Timka

  Our EC2 Instance (Windows Server 2008) crashed multiple times for the past 3 months (last time was today at 1:05 EST). Upon reviewing MEMORY.DMP file we noticed that possible cause of the crashes is rhelnet.sys (RedHat PV NIC Driver). Server's Event Viewer has the following records right after the crash: Critical - Kernel Power: The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. BugCheck: The computer has rebooted from a bugcheck. The bugcheck was: 0x000000d1 (0x000000000000002d, 0x0000000000000002, 0x0000000000000000, 0xfffff88001402d14). A dump was saved in: C:\Windows\MEMORY.DMP. Report Id: 100113-35849-01. Could this be a hardware issue? Would it help if we stop and start the instance? Or is this more likely that this is caused by the software running on the system? [Update 10.01.2013] Amazon Rep suggested to update RH drivers to Citrix PV drivers on our instance: Upgrading PV Drivers [Update 10.08.2013] We performed a drivers upgrade on the cloned instance. Right after the upgrade we noticed the following errors in our Event viewer: Xennet6 errors in Event Viewer (Event ID# 5001) After digging a bit more I found this article suggesting to install the latest Citrix drivers. Unfortunately, this didn't help us at all and our cloned instance became unresponsive. [Update 10.08.2013 2] I recreated an instance and updated PV drivers again. After searching on Internet I found this article where Amazon Rep explains that: "Event ID 5001 from source Xennet6 cannot be found" message does not indicate anything wrong, just that the PV driver is looking for a feature that we have not implemented in our version of Xen. I will keep my test system running for a while to see if there any issues with it.

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• Indefinite hang when restoring SQL 2005 database on a SQL 2008 server in EC2

  - by erinloy

  I'm trying to restore a 25 GB database backup taken from a Windows 2003/SQL 2005 machine to a Windows 2008/SQL 2008 machine in the Amazon EC2 cloud, using a .bak file and the SQL Management Studio. SQL Management Studio reports the restore reaches 100% complete, and then just hangs indefinitely (24+ hours) using a lot of CPU, until I restart the SQL Server service. Upon restart, SQL again uses a lot of CPU activity for what seems to be an indefinite amount of time, but the DB never comes online. Here are some details: - I have created two EBS volumes, one for DATA and one for LOGS, and I have set the default directories in SQL Server to the \DATA and \LOG directory on these respective volumes. (I wonder if the issue could be related to this, but the DB is too big to restore on the root drive.) - I have given the SQL Server user group full access to these directories. - The server can create a new empty test DB in these directories just fine, and can backup and restore the test DB. - I have tried both restoring of a .bak file and attaching directly to copies of the original .mdf/.ldf files, and the result is the same in both cases. - Both the .bak restore and the .mdf/.ldf attach occur from/to the EBS volumes. - I've also tried the above via SQL script, and "WITH RECOVERY", with no difference in the result, just less UI. - The backup contains two full text indexes. - I have to use "WITH MOVE" for most of the files in the backup. - There's nothing wrong with the backup or .mdf/.ldf files, as this works just fine on a Windows 2003/SQL 2005 machine in the Amazon EC2, but not Windows 2008/SQL 2008. - The DB is NOT marked as "Restoring" in the SQL Management Studio - it is just listed as a normal database, but throws errors when I try to do anything with it (expand the object browser tree, view properties, etc.) Any ideas?

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• How can we configure the Bitnami Joomla stack to open a socket on startup?

  - by bobo

  I have deployed the Bitnami Ubuntu Joomla! 3.1.5-2 (64-bit) stack on Amazon Cloud: http://bitnami.com/stack/joomla/cloud/amazon By default, the stack is configured to run PHP using PHP-FPM. I have no problem getting the Joomla and phpmyadmin running as virtual hosts on Apache. But now, I would like to add another virtual host. The problem I am having is, I have no idea how to get the system creating a socket on startup in the following folder: bitnami@ip-172-31-15-99:/opt/bitnami/php/var/run$ ls -al total 12 drwxr-xr-x 2 root root 4096 Nov 3 20:43 . drwxr-xr-x 4 root root 4096 Oct 9 15:39 .. srw-rw-rw- 1 root root 0 Nov 3 20:43 joomla.sock -rw-r--r-- 1 root root 4 Nov 3 20:43 php5-fpm.pid srw-rw-rw- 1 root root 0 Nov 3 20:43 phpmyadmin.sock srw-rw-rw- 1 root root 0 Nov 3 20:43 www.sock bitnami@ip-172-31-15-99:/opt/bitnami/php/var/run$ I have the following /opt/bitnami/apps/mywebsite/conf/php-fpm/pool.conf file: [mywebsite] listen=/opt/bitnami/php/var/run/mywebsite.sock include=/opt/bitnami/php/etc/common-dynamic.conf include=/opt/bitnami/apps/mywebsite/conf/php-fpm/php-settings.conf pm=dynamic As it can be seen, listen points to the mywebsite.sock which does not currently exist. I did an experiment, by removing the .sock files in the /opt/bitnami/php/var/run folder and they would come back on reboot. So how can we configure it to open a socket for mywebsite on startup?

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• stunnel not working - stunnel.pem: No such file or directory

  - by Marronsuisse

  I am trying to install stunnel on an amazon LINUX machine. (i want to configure postfix so that it sends its emails through amazon ses) I first tried to install from the tar.gz package download from http://www.stunnel.org and installed with the commands: ./configure make make install but than the stunnel command was still not found. Then I installed with yum install stunnel. But now when I try I get: sudo stunnel 2012.06.23 06:51:53 LOG7[20071:3078289200]: Snagged 64 random bytes from /root/.rnd 2012.06.23 06:51:53 LOG7[20071:3078289200]: Wrote 1024 new random bytes to /root/.rnd 2012.06.23 06:51:53 LOG7[20071:3078289200]: RAND_status claims sufficient entropy for the PRNG 2012.06.23 06:51:53 LOG7[20071:3078289200]: PRNG seeded successfully 2012.06.23 06:51:53 LOG3[20071:3078289200]: stunnel.pem: No such file or directory (2) So it seems there is still a problem with the install. When I use the locate stunnel command, I see files a bit everywhere. How can I do to have a clean install of stunnel? Edit: i was following this procedure: http://docs.amazonwebservices.com/ses/latest/DeveloperGuide/SMTP.MTAs.SecureTunnel.html when I got stuck at point 5 and got the stunnel.pem: No such file or directory message.

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• Running your own GAE server

  - by h2g2java

  The question http://stackoverflow.com/questions/2505265/how-difficult-is-it-to-migrate-away-from-google-app-engine triggered me to think about this issue again. I have read of someone running, production-wise, Google app engine development version on their own server. My questions are: Are there any security issues running GAE development on your own server in production mode and exposing it to the www? If so how to mitigate them? Can GAE dev be run on Amazon? Is it possible to port my GAE apps running on Google servers to a GAE running on Amazon, without code changes, but without changing any reference in using other gdata services such as google docs, youtube, gmail, etc. How to configure GAE dev server to use my own hadoop? Or to use Amazon's hadoop?

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• Tomcat performing terribly for no apparent reason

  - by John

  We're running a game application .WAR on Tomcat 6 on an Amazon EC2 server, 8 core processor, 7gb RAM. The application uses a MySQL database hosted on Amazon RDS. This Facebook application takes ages to access when a mere 20-30 users are playing it. Big difference from 1-2 users. The entire .WAR is ~4mb, all static content hosted elsewhere. The server has never been close to running out of RAM. The CPU utilization has never been higher than 13.5-14%. Even with ~500 users that completely slowed everything to a standstill. The thread count or threadpools isn't close to being maxed out. I heightened maxthreads but it didn't make a noticeable difference. My theory is that Tomcat can only use one processor core, which would explain why it was slowed to a halt even though CPU usage was stably at 13-14% at the activity spike. But I'm struggling to understand why it would only use one CPU core. There is no processor cap in server.xml. The app contains several servlets (4 or 5). There is no mention of SingleThreadModel in the Java code. WHAT could be causing the application to run extremely slowly? If there is only 1-5 people on the application it runs fine. With 20-30 people it's barely contactable.

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