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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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  • How to Architect a system on AWS for scaling (with a MySQL back-end)

    - by Edan Maor
    I'm trying to understand how to architect an Amazon Web Services application. As I understand it, the whole point of using something like AWS is to make the eventual scaling easier, so I'm trying to understand how to do that. I have an instance, running off of EBS (EBS-based instance, not a regular instance). My application (a Django app) uses MySQL as a back-end. So the question is, where am I supposed to install the MySQL? Do I install it on the same instance? In which case, as far as I can tell, I can't simply create more server instances from that image. Or am I supposed to simply spin up another server as a DB server, and run off of that? Thanks for any help!

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  • Benefits to private networks between virtual machines on an ESXi host?

    - by arex1337
    I'm planning this development environment with a few database servers, and originally thought I would have a few private networks. I then thought it might be unnecessary as the ESXi cluster already provides redundancy with 4 NICs (in my case) and should manage the network traffic pretty intelligently, right? Two private networks Zero private networks What are the advantages/disadvantages between the two shown configurations - on an ESXi 4.1 host?

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  • AWS VPC - why have a private subnet at all?

    - by jkim
    In Amazon VPC, the VPC creation wizard allows one to create a single "public subnet" or have the wizard create a "public subnet" and a "private subnet". Initially, the public and private subnet option seemed good for security reasons, allowing webservers to be put in the public subnet and database servers to go in the private subnet. But I've since learned that EC2 instances in the public subnet are not reachable from the Internet unless you associate an Amazon ElasticIP with the EC2 instance. So it seems with just a single public subnet configuration, one could just opt to not associate an ElasticIP with the database servers and end up with the same sort of security. Can anyone explain the advantages of a public + private subnet configuration? Are the advantages of this config more to do with auto-scaling, or is it actually less secure to have a single public subnet?

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  • How can one domain route to an always-changing pool of servers?

    - by ryeguy
    I'm sure this is an easy solution, I'm just not too familiar with how DNS works or if that's even related to this problem. If I'm running a web service on amazon ec2, distributed across many instances, how can I make it so a single domain name can be used to access the entire pool of servers, which will be changing from time to time? Since the instances may be present one second but gone the next (and vice versa), I need a way to randomly pick an active member of the cluster to route to. The updates would have to be instantaneous. Is this even possible, with dns caching and all?

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  • Blocking IP addresses Load Balanced Cluster

    - by Dom
    Hi We're using HAproxy as a front end load balancer / proxy and are looking for solutions to block random IP addresses from jamming the cluster. Is anyone familiar with a conf for HAProxy that can block requests if they exceed a certain threshold from a single IP within a defined period of time. Or can anyone suggest a software solution which could be placed in front of HAProxy to handle this kind of blocking. Thanks Dom--

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  • How does everyone set up AWS for PHP with a git workflow while worrying about distributing EC2?

    - by Parris
    Hello, I have been looking for something like heroku but for php, and after much frustration (and almost finding what I need, but not quite) we decided to just go with AWS without any other abstraction. We are using PHP 5.3 (and CakePHP 1.3), and are currently using git. Ubuntu seems like the easiest way to get both of those on there and we will most likely use that. We aren't really going worry about outgoing email. We are using smtp through gmail, but will most likely switch to some other service eventually. I had 3 questions: 1) I have been looking at Zend Server, and I am not quite sure how that is more beneficial than xampp. Perhaps it is not? 2) I suppose to make the application scale we would need multiple instances of some ec2 ami. Then just duplicate it and such. The question then becomes how do we make sure all EC2 instances are up to date? 3) I understand the concept of load balancing to some degree. I understand that in 1 region you select a bunch of servers and have it load balance across them. The question then becomes well how about world wide? How do I make it so that traffic is directed to the correct ec2 server? I have heard of route 53, and tried signing up for that, but nothing appears in my control panel. Also perhaps it is just a DNS thing with my domain registrar? AHHH... some tutorial would be helpful!

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  • DNS for private network - should router be the DNS server?

    - by smcg
    I want to set up BIND for a private subdomain on a private network, like in the question here: How to configure bind for a private subdomain? My question is this - should my (linux) router act as the DNS server for this? Or should I have a seperate machine on the network acting as the DNS server? Does it not matter as long as all the machines on the network are configured to resolve to the internal DNS server?

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  • Combining multiple linux boxes and create VMs out of it

    - by NS Gopikrishnan
    I am new to virtualization. I am running on ubuntu. I have a set of linux machines (5 to 6 machines). Which I want to combine as a single resource pool and on demand create multiple virtual instances of machines out of it. This is comparable to what VirtualBox does in a single system. I stumbled across many key words: Xen, Eucalyptus, OpenStack etc. But things are very vague as to which will help me achieve this requirement. Any help will be appreciated :) Thanks in advance!

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  • Logs show lots of user attempts from unknown IP

    - by rodling
    I lost access to my instance which I host on AWS. Keypairing stopped to work. I detached a volume and attached it to a new instance and what I found in logs was a long list of Nov 6 20:15:32 domU-12-31-39-01-7E-8A sshd[4925]: Invalid user cyrus from 210.193.52.113 Nov 6 20:15:32 domU-12-31-39-01-7E-8A sshd[4925]: input_userauth_request: invalid user cyrus [preauth] Nov 6 20:15:33 domU-12-31-39-01-7E-8A sshd[4925]: Received disconnect from 210.193.52.113: 11: Bye Bye [preauth] Where "cyrus" is changed by hundreds if not thousands of common names and items. What could this be? Brute force attack or something else malicious? I traced IP to Singapore, and I have no connection to Singapore. May thought is that this was a DoS attack since I lost access and server seemed to stop working. Im not to versed on this, but ideas and solutions for this issue are welcome.

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  • Where can someone store >100GB of pictures online? [closed]

    - by sbi
    A person who is not very computer-savvy needs to store 130GB of photos. The key parameters are: an non-negligible probability that the company selling the storage will be existing, and the data accessible, for at least five years data should be considered safe once uploaded reasonable terms of service: google drive reserving the right to literally do anything they want with their user's data is not acceptable; the possibility that the CIA might look at those pictures is not considered a threat easy to use from Windows, preferably as a drive no nerve-wracking limitations ("cannot upload 10GB/day" or "files 500MB" etc.) that serve no purpose other than pushing the user to the next-higher price plan some upgrade plan: there's currently 10-30GB of new photos per year, with a tendency to increase, which might bust a 150GB limit next January ability to somehow sort the pictures: currently they are sorted into folders, but something alike (tags) would be just as good, if easy enough to apply of course, the pricing is important (although there's a reason this is the last bullet; reasonable data safety is considered more important) Nice to have, but not necessary features would be: additional features related to photos (thumbnail generation, album sharing etc.) access from web and other platforms than Windows (smart phones) Let me stress this again: The person in need of that is able to copy pictures from the camera to the computer, can copy files in the explorer, and uses a web email service. That's about it, there's almost no understanding of what happens under the hood.

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  • Amazon - install a complete server on EBS

    - by user1169575
    is it possible to install a full working OS with a webserver, db, and all needed stuff on an EBS storage? If so, would I immediatly gain benefits by mounting this EBS on a better instance? Otherwise (if I cannot install a complete image, or if you don't think it's reasonable) can I install the software so that I only need to mount the EBS on a new instance to have it working? I purchased a Medium Reserved Instance, but when there will be the need to get a better instance I'd like to move the whole db/website, I'd simply buy a better instance and then attach the EBS. Is it possibile? I'm imaging about it like an hard drive that would be mounted on a better server. Of course, more RAM would allow me to increase caching limits, and that's ok, but I don't want to reinstall anything (the main website is a magentocommerce and it's pretty painful to move it). P.S. is the Standard EBS (100 IOPS) valid or do I need to choose a Provisioned IOPS (up to 1000 IOPS)?

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  • Amazon EC2 as load balanced/failover solution

    - by sugiggs
    Hi All, I'm thinking of an idea but not sure the pros/cons of it. At the moment, we are hosting our website on a dedicated server. As a failover/load balanced solution, I'm thinking to use Amazon EC2+EBS. The files can be rsync and mysql can be setup as master-master replication When the load is high, I can up the machine, given sometime to "sync" and load balanced the traffic there. is it do-able? any link I can read more on this?

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  • What kind of hosting is used for *tube sites?

    - by playcat
    Hello, When a site grows from a just-a-fun project to a site with bigger load of visitor, and you want to enable them to upload videos, you might find yourself in a need of a better hosting, including dedicated server and a no-limit web traffic (or some reasonable limit). So, if people can upload their videos, and if page has around 1000-10000 visitors per day, what kind of hosting is there to choose from? What is needed in that case? Thx

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  • Mounting an Amazon EC2 instance on Mac OS X

    - by hinghoo
    I've got public key authentication working between my Mac OS X and an Amazon EC2 instance so that from the command-line I can just type the following and it works: ssh root@[IPAddressOfEC2Instance] The strange thing is that I can't seem to mount the instance using "Connect to Server" in the Finder. I've tried typing the following server addresses into the "Connect to Server" dialog: ftps://[IPAddressOfEC2Instance] ftps://root@[IPAddressOfEC2Instance] But all I get is You entered an invalid username or password. Please try again. The root user on the EC2 instance has a blank password and I'm wondering if it has to do with that. However, I can't change the password for the root user. I can use an SFTP client to connect to the machine, I just can't mount it with "Connect to server". It asks for a username and password (for a registered user) and it's root/[blank] which it doesn't accept. The other option is "Guest" which brings up an empty folder in the Finder.

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  • EC2 Image to start

    - by HD.
    I'm starting to test EC2 for a couple of new projects. I need to choose an AMI (Amazon Machine Image) and Amazon offered me as first option Fedora Core 8, which is a very old version of one of my favorites distributions. There is a lot of choices, but it's not clear for me which one is the better option. I have my own reasons in order to choice a distro and a version when I need to install a new server but I don't know If I can apply the same for EC2. I know there is a beta for RHEL, how stable is this beta?, How can I choose between all the CentOS AMIs in the list? So this is my question: Do you recommend an AMI to start with EC2? Thanks

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  • KVM vs Hyper-V. Which hypervisor is best for windows guests?

    - by user198851
    I am currently testing openstack for windows guests (XP and 7). I have deployed openstack "all in one" on system with following specs Processor corei5. (4 physical cores and 8 Threads with HT Technology) RAM 8 GB. HD 500 GB. I have created 4 windows xp guests with 512MB RAM and 1VCPU. On each windows guest i have installed visual studio 2008 only. In nova.conf CPU Over-Commit ratio is 2 for better performance (as mentioned in openstack operation guide). Using KVM as hyerpvisor. I have observed poor performance when simultaneously using visual studio in four windows instances. How i can improve performance ? Should i use KVM or Hyper-V ? or any other suggestion ?

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  • Online FTP or file sharing service [on hold]

    - by Frede
    We need to share large files with clients, e.g. clients upload a large file, we modify it and later make it available for download. Up until now we've used FTP but this has a number of drawbacks. A lot of management of files and setting up accounts etc. We are therefore considering online alternatives. Requirements: Cheap, 8-) Easy to use, ideally just requiring a web browser, but also possible for power users to connect e.g. via FTPS/SFTP No registration requried for users to upload/download files. We ourselves of course need to be able to login an view uploaded files and upload new files. No per user fee High bandwidth. As files may be GBs in size both upload and download speed cannot be too slow Secure. Encryption during upload/download. No way for users to access uploaded files. Once a user has uploaded a file they (or anyone else besides us) should be able to access the file. To download files users get a link with a password. Ideally the link expires after a set time. No software installation We do NOT need any sync features, backup, versioning etc. Just a quick, easy, secure way for us to share files with our clients. Services like JustCloud, DriveHQ etc seems bloated and "too much" for what we need. What other alternatives exist? Thanks!

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  • Data storage solutions for rapidly running out of space

    - by Grimlockz
    I have 2 web servers (1 live and other backup), the issue I have is our storage is rapidly running out. All the data on the server is used by our customers and new documents are uploaded to the server daily. So nothing can be deleted as it's always in use. We use a flat file structure with no database. I'm seeking solutions or ideas for the best place to move the our data to. The data has to be secure and needs to run on a linux environment. Not sure where to start - clusters, vmware, or they such solutions for huge file servers?

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  • How do I start a cloud9 service

    - by Lord Loh.
    Cloud9 is a free IDE available from https://github.com/ajaxorg/cloud9/ under GPLv3. I would like to use this to set up a service like https://c9.io/. The Cloud9 documentations do not mention anything about it. The Cloud9 documentation assume a sing user on localhost or bind to another address without one hard set username and hard set password. How do I run cloud9 IDE on my computer allowing multiple users? Are there any documentations? This is the closest to what I found - https://github.com/avgp/cloud9hub (for multiple workspaces)

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  • Database with 5 Tables with Insert and Select

    - by kirbby
    hi guys, my problem is that i have 5 tables and need inserts and selects. what i did is for every table a class and there i wrote the SQL Statements like this public class Contact private static String IDCont = "id_contact"; private static String NameCont = "name_contact"; private static String StreetCont = "street_contact"; private static String Street2Cont = "street2_contact"; private static String Street3Cont = "street3_contact"; private static String ZipCont = "zip_contact"; private static String CityCont = "city_contact"; private static String CountryCont = "country_contact"; private static String Iso2Cont = "iso2_contact"; private static String PhoneCont = "phone_contact"; private static String Phone2Cont = "phone2_contact"; private static String FaxCont = "fax_contact"; private static String MailCont = "mail_contact"; private static String Mail2Cont = "mail2_contact"; private static String InternetCont = "internet_contact"; private static String DrivemapCont = "drivemap_contact"; private static String PictureCont = "picture_contact"; private static String LatitudeCont = "latitude_contact"; private static String LongitudeCont = "longitude_contact"; public static final String TABLE_NAME = "contact"; public static final String SQL_CREATE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "(" + IDCont + "INTEGER not NULL," + NameCont + " TEXT not NULL," + StreetCont + " TEXT," + Street2Cont + " TEXT," + Street3Cont + " TEXT," + ZipCont + " TEXT," + CityCont + " TEXT," + CountryCont + " TEXT," + Iso2Cont + " TEXT," + PhoneCont + " TEXT," + Phone2Cont + " TEXT," + FaxCont + " TEXT," + MailCont + " TEXT," + Mail2Cont + " TEXT," + InternetCont + " TEXT," + //website of the contact DrivemapCont + " TEXT," + //a link to a drivemap to the contact PictureCont + " TEXT," + //a photo of the contact building (contact is not a person) LatitudeCont + " TEXT," + LongitudeCont + " TEXT," + "primary key(id_contact)" + "foreign key(iso2)"; and my insert looks like this public boolean SQL_INSERT_CONTACT(int IDContIns, String NameContIns, String StreetContIns, String Street2ContIns, String Street3ContIns, String ZipContIns, String CityContIns, String CountryContIns, String Iso2ContIns, String PhoneContIns, String Phone2ContIns, String FaxContIns, String MailContIns, String Mail2ContIns, String InternetContIns, String DrivemapContIns, String PictureContIns, String LatitudeContIns, String LongitudeContIns) { try{ db.execSQL("INSERT INTO " + "contact" + "(" + IDCont + ", " + NameCont + ", " + StreetCont + ", " + Street2Cont + ", " + Street3Cont + ", " + ZipCont + ", " + CityCont + ", " + CountryCont + ", " + Iso2Cont + ", " + PhoneCont + ", " + Phone2Cont + ", " + FaxCont + ", " + MailCont + ", " + Mail2Cont + ", " + InternetCont + ", " + DrivemapCont + ", " + PictureCont + ", " + LatitudeCont + ", " + LongitudeCont + ") " + "VALUES (" + IDContIns + ", " + NameContIns +", " + StreetContIns + ", " + Street2ContIns + ", " + Street3ContIns + ", " + ZipContIns + ", " + CityContIns + ", " + CountryContIns + ", " + Iso2ContIns + ", " + PhoneContIns + ", " + Phone2ContIns + ", " + FaxContIns + ", " + MailContIns + ", " + Mail2ContIns + ", " + InternetContIns + ", " + DrivemapContIns + ", " + PictureContIns + ", " + LatitudeContIns + ", " + LongitudeContIns +")"); return true; } catch (SQLException e) { return false; } } i have a DBAdapter class there i created the database public class DBAdapter { public static final String DB_NAME = "mol.db"; private static final int DB_VERSION = 1; private static final String TAG = "DBAdapter"; //to log private final Context context; private SQLiteDatabase db; public DBAdapter(Context context) { this.context = context; OpenHelper openHelper = new OpenHelper(this.context); this.db = openHelper.getWritableDatabase(); } public static class OpenHelper extends SQLiteOpenHelper { public OpenHelper(Context context) { super(context, DB_NAME, null, DB_VERSION); } @Override public void onCreate(SQLiteDatabase db) { // TODO Auto-generated method stub db.execSQL(Contact.SQL_CREATE); db.execSQL(Country.SQL_CREATE); db.execSQL(Picture.SQL_CREATE); db.execSQL(Product.SQL_CREATE); db.execSQL(Project.SQL_CREATE); } @Override public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { // TODO Auto-generated method stub Log.w(TAG, "Upgrading database from version " + oldVersion + " to " + newVersion + ", which will destroy all old data"); db.execSQL(Contact.SQL_DROP); db.execSQL(Country.SQL_DROP); db.execSQL(Picture.SQL_DROP); db.execSQL(Product.SQL_DROP); db.execSQL(Project.SQL_DROP); onCreate(db); } i found so many different things and tried them but i didn't get anything to work... i need to know how can i access the database in my activity and how i can get the insert to work and is there sth wrong in my code? thanks for your help thats how i tried to get it into my activity public class MainTabActivity extends TabActivity { private Context context; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.maintabactivity); TabHost mTabHost = getTabHost(); Intent intent1 = new Intent().setClass(this,MapOfLight.class); //Intent intent2 = new Intent().setClass(this,Test.class); //Testactivity //Intent intent2 = new Intent().setClass(this,DetailView.class); //DetailView Intent intent2 = new Intent().setClass(this,ObjectList.class); //ObjectList //Intent intent2 = new Intent().setClass(this,Gallery.class); //Gallery Intent intent3 = new Intent().setClass(this,ContactDetail.class); mTabHost.addTab(mTabHost.newTabSpec("tab_mol").setIndicator(this.getText(R.string.mol), getResources().getDrawable(R.drawable.ic_tab_mol)).setContent(intent1)); mTabHost.addTab(mTabHost.newTabSpec("tab_highlights").setIndicator(this.getText(R.string.highlights),getResources().getDrawable(R.drawable.ic_tab_highlights)).setContent(intent2)); mTabHost.addTab(mTabHost.newTabSpec("tab_contacts").setIndicator(this.getText(R.string.contact),getResources().getDrawable(R.drawable.ic_tab_contact)).setContent(intent3)); mTabHost.setCurrentTab(1); SQLiteDatabase db; DBAdapter dh = null; OpenHelper openHelper = new OpenHelper(this.context); dh = new DBAdapter(this); db = openHelper.getWritableDatabase(); dh.SQL_INSERT_COUNTRY("AT", "Austria", "AUT"); } } i tried it with my country table because it has only 3 columns public class Country { private static String Iso2Count = "iso2_country"; private static String NameCount = "name_country"; private static String FlagCount = "flag_image_url_country"; public static final String TABLE_NAME = "country"; public static final String SQL_CREATE = "CREATE TABLE IF NOT EXISTS " + TABLE_NAME + "(" + Iso2Count + " TEXT not NULL," + NameCount + " TEXT not NULL," + FlagCount + " TEXT not NULL," + "primary key(iso2_country)"; public boolean SQL_INSERT_COUNTRY(String Iso2CountIns, String NameCountIns, String FlagCountIns) { try{ db.execSQL("INSERT INTO " + "country" + "(" + Iso2Count + ", " + NameCount + ", " + FlagCount + ") " + "VALUES ( " + Iso2CountIns + ", " + NameCountIns +", " + FlagCountIns + " )"); return true; } catch (SQLException e) { return false; } } another question is it better to put the insert and select from each table into a separate class, so i have 1 class for each table or put them all into the DBAdapter class?

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  • Wednesday at Oracle OpenWorld 2012 - Must See Session: “Cloud and On-Premises Applications Integration, Using Oracle Integration Adapters”

    - by Lionel Dubreuil
    Don’t miss this “CON8642 - Cloud and On-Premises Applications Integration, Using Oracle Integration Adapters“ with Ramkumar Menon - Senior Product Manager, Oracle: Date: Wednesday, Oct 3 Time: 1:15 PM - 2:15 PM Location: Moscone South – 310 Oracle integration adapters in Oracle Fusion Middleware offer organizations a service-oriented approach to unlocking the information assets that have evolved in most IT environments. This session provides a detailed overview of their features and product architecture and an update on the 11g release. It also examines the changing application and technology landscape and how the integration adapters will continue to provide connectivity and harness information from diverse enterprise applications and technologies—both on-premises and in the cloud. Objectives for this session are to: Present an Oracle integration adapters overview Describe key use cases Provide an update on the 11g release and future roadmap Normal 0 false false false EN-US X-NONE X-NONE /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-priority:99; mso-style-qformat:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Calibri","sans-serif";}

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