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• Amazon Linux AMI release 2010.11.1 corresponds to which RHEL version (4/5/6)?

  - by Jayesh

  I am using the default Amazon Linux AMI in an EC2 instance - Amazon Linux AMI release 2010.11.1. I can see that it's a Redhat based system, but after trying many tools (/etc/issues, uname -a, lsb_release), I cannot tell which version of RHEL or CentOS is it based on. I need to get some packages that are not available in Amazon's package repos. I have list of custom yum repos that I can use, but since I don't know which RHEL version is the Amazon AMI based on, I cannot choose from different versions of repos. How can I find whether it's running RHEL 4/5/6 (or their CentOS counterparts)?

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• I want to make an item on a Windows 7 Jump List run as administrator

  - by ProfKaos

  Only occasionally I have to open a Visual Studio project with a VS instance running under admin. This is a little inconvenient because I can't use the short-cut for that project in the VS Jump List. How can I modify the Jump List entry to force VS to open that project running as admin? Please note that I'm not trying to avoid providing admin auth to do this. I'm just trying to avoid having to run VS as admin, and then having to open the project from within VS once it opens.

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• startup cassandra layout

  - by davidkomer

  We've got a relatively low-traffic site (~1K pageviews/day) hosted on a single server, and expect it to grow significantly over the next few years. I'm thinking of moving over to Rackspace CloudServer or EC2 and firing up 3 nodes (all on CentOS): 2 x Web (Apache) - with loadbalancer 1 x MySQL (for the Wordpress powered part) The question is where to put Cassandra right now... Should it sit on each Web node, or the MySQL node? My thought right now is to put it on Web nodes. It's my understanding that Cassandra has the benefits of fault-tolerance (i.e. if we take a node down, the site is still operational). So even with only 2 nodes, we'd have that benefit as opposed to just putting it on the MySQL node. Also, as we scale up and add another node, a cassandra instance can come along with it and the php can always run its queries on localhost. Is this a good idea?

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• How to enable a Web portal-based rich enterprise platform on different domains and hosts using JS without customization/ server configuration

  - by S.Jalali

  Our company Coscend has built a Web portal-based communications and cloud collaboration platform by using JavaScript (JS), which is embedded in HTML5 and formatted with CSS3. Other technologies used in the core code include Flash, Flex, PostgreSQL and MySQL. Our team would like to host this platform on five different Windows and Linux environments that run different types of Web servers such as IIS and Apache. Technical challenge: Each of these Windows and Linux servers have a different host name and domain name (and IP address), but we would like to keep our enterprise platform independent of host server configuration. Possible approach to solution: We think an API (interface module with a GUI) is needed to accomplish this level of modularity and flexibility while deploying at our enterprise customers. Seeking your insights: In this context, our team would appreciate your guidance on: Is there an algorithmic method to implement this Web portal-based platform in these Windows and Linux environments while separating it from server configuration, i.e., customizing the host name, domain name and IP address for each individual instance? For example, would it be suitable to create some JS variables / objects for host name and domain name and call them in the different implementations? If a reference to the host/domain names occurs on hundreds of portal modules, these variables or JS objects would replace that. If so, what is the best way to make these object modules written in JS portable and re-usable across different environments and instances for enterprise customers? Here is an example of the implemented code for the said platform. The following Web site (www.CoscendCommunications.com) was built using this enterprise collaboration platform and has the base code examples of the platform. This Web site is domain-specific. We like to make the underlying platform such that it is domain and host-independent. This will allow the underlying platform to be deployed in multiple instances of our enterprise customers.

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• Dim (NEARLY blank) laptop screen, secondary screen works - why?

  - by LIttle Ancient Forest Kami

  My laptop screen is (almost) black while my secondary screen is fine. I believe it to be backlight / brightness related. Problem description it starts when I start the laptop system loads and works fine, just screen has problems I can see the screen though very faintly / dimly - it's hard to see anything which ain't very white e.g. starting screen has big Thinkpad logo in white, large font - I can see it, though very dimly second screen works very well Official backligtht debugging: using acpi setting as prescribed there for Thinkpads didn't help I can see an entry in /sys/class/backlight/ and it changes when I press hotkeys for brightness (current backlight power for instance goes up or down) acpi-off didn't helpm neither did acpi_backlight=vendor Hardware data Laptop is Thinkpad Edge with glossy screen. 4 processors, 2 cores, exemplary CPU data from cat /proc/cpuinfo reports Genuine Intel i5 (M 480 @ 2.67GHz). OS is Ubuntu Lucid, 10.04 LTS, 64-bit, with Linux generic kernel (2.6.32-44) and GNOME 2.32.2 (though I doubt there lies the problem). $ lspci | grep VGA 01:00.0 VGA compatible controller: ATI Technologies Inc M92 [Mobility Radeon HD 4500 Series] $ lshw -C display *-display description: VGA compatible controller product: M92 [Mobility Radeon HD 4500 Series] vendor: ATI Technologies Inc physical id: 0 bus info: pci@0000:01:00.0 version: 00 width: 32 bits clock: 33MHz capabilities: pm pciexpress msi bus_master cap_list rom configuration: driver=radeon latency=0 resources: irq:33 memory:c0000000-dfffffff(prefetchable) ioport:2000(size=256) memory:f0300000-f030ffff memory:f0320000-f033ffff(prefetchable) Driver I was NOT running any proprietary drivers, just checked with "Hardware drivers". There is one for ATI that is suggested there, though I didn't need it so far. UPDATE: changing the driver to proprietary one (ATI/AMD FGLRX) didn't help. Tried and failed Resetting / running on power or battery / charging / getting rid of static electricity / warming up *doesn't help* This is NOT a blank-screen problem, at least it isn't following official Ubuntu black-screen diagnostics - I can see my screen, though barely. What I will try next: - check last updates I've made - IIRC I am running on nomodeset already, but will verify this Any ideas how to proceed best? What is most probable cause?

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• Forcing exact hostname match in IIS

  - by iis_newbie

  I am looking how to force an exact hostname match within IIS when using https. For instance, I want "https://works.mysite.com/resource" to be ok, but "https://noworks.mysite.com/resource" to return 404 (assuming they both resolve to the same IP). IIUC, the default behavior of IIS when going to "https://noworks.mysite.com/resource" is to get a cert warning, if the user presses continue, the user is able to access the URL. I was able to do this by generating a *.mysite.com SSL cert, and then specify the hostname within the bindings in IIS, but without the * in the beginning, the hostname field is disabled and blank. Am I missing something simple here?

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• How can I port forward over a VPN NAT?

  - by Charlie

  I have a multi-site VPN currently running with pfSense boxes and currently using OpenVPN. However I can change the OS and VPN type if need be. The main router has a 10.13.0.0/16 subnet and a series of public IPs For example, a branch has a 10.12.1.0/24 subnet How can I port forward NAT traffic on a public IP of the main router to a server behind the NAT of the second? So for instance port 95 on a public IP assigned to the main router forwards to 10.12.1.102 on the other router. Is this even possible? Currently my setup works great but only for intertnal traffic

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• MySQL returning slow queries with result sets bigger than 30 rows

  - by josephs8

  When ever I run a query that exceeds 30 queries the time for the query to run goes from less than a second to over 10 seconds to get data. Example I run a query to return 29 rows, it takes .1 seconds, I run a query to return 31 rows it takes 11.2 seconds. I am running mySQL on Windows 2008 Server Dual Core 2.6Ghz with 3GB of Memory. The machine doesn't run anything else. It does have a instance of MSSQL running on the server but that does not get used at all. This only happens via PHP right now, If I manually run the query on the server it returns it in less than a second. The queries are not complicated either I have included one below: SELECT Name, Value FROM `bis_co`.`departments` LIMIT 31 What would be causing this issue and how can I correct this? Am I missing a configuration setting in MySQL or something. Thanks

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• Is Page-Loading Time Relevant?

  - by doug

  Take this (ServerFault) page for instance. It has about 20 elements. When the last of these has loaded, the page is deemed "loaded"--but not before. This is certainly the protocol used by our testing service (which is among the small group of well-known vendors that offer that sort of service). Obviously this method is based on a clear, definite endpoint--therefore it's easy to apply w/ concomitant reliability. I think it's also the metric used by the popular Firefox plugin, 'YSlow.' For my employer's website, nearly always the last-to-load items are tracking code, tracking pixels, etc., so from the user's point of view--their perception--the page was "loaded" well before it had actually loaded based on the criterion used by our testing service (15-20% is a rough estimate). I'm sure i'm not the first person to consider this nor the first to wonder if it is causing micro-optimization while ignoring overall system-level, or user-perceived performance. So my question is, are there are other more practical (yet still reasonably precise) measures of page loading time?

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• How to accept email *only* from white-listed addresses in Gmail? [migrated]

  - by Mawg

  I only want to accpet email from two addresses, the rest I want to delete immediately, unseen. I know how to make fileers and I can whitelist those two addresses. If I make 3 filter, in this order; 1) from [email protected] move to inbox, never mark as spam 2) from [email protected] move to inbox, never mark as spam 3) from *@*.* delete immediately, never move to trash can I be guaranteed that that will do what I want? For instance, can I be sure that the filters are executed in that order? I dont want to lose amy mail from those two adresses.

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• How much information can you mine out of a name?

  - by Finglas Fjorn

  While not directly related to programming, I figured that the programmers on here would be just as curious as I was about this question. Feel free to close the question if it does not meet with the guidelines. A name: first, possibly a middle, and surname. I'm curious about how much information you can mine out of a name, using publicly available datasets. I know that you can get the following with anywhere between a low-high probability (depending on the input) using US census data: 1) Gender. 2) Race. Facebook for instance, used exactly that to find out, with a decent level of accuracy, the racial distribution of users of their site (https://www.facebook.com/note.php?note_id=205925658858). What else can be mined? I'm not looking for anything specific, this is a very open-ended question to assuage my curiousity. My examples are US specific, so we'll assume that the name is the name of someone located in the US; but, if someone knows of publicly available datasets for other countries, I'm more than open to them too. I hope this is an interesting question!

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• Interaction between two Clouds

  - by user7969

  I have setup the Cloud-A with 1 - [CLC+CC] and 2 - [NC] computers. I have another Cloud-B with same configuration. [using the Ubuntu Enterprise Cloud] Both of them working fine individually, in the same LAN. Now if I want to add the NC of Cloud-A to CC of Cloud-B, [in case the resources of Cloud-B are exhausted] how can I make it possible ? I guess this calls for the interoperability stuff... Could you please explain what happens exactly when we ask for instance, the direct interaction happens between the client and NC or it goes through the CLC and CC ? What I want to say is, say there are multiple cloud providers. A user is subscribed to any one of them, say Cloud-A for IaaS. As the requirements are dynamic, all the resources of Cloud-A may get exhausted. There may be another Cloud-B which can provide the services but that Cloud-A can't ask the client to go for Cloud-B. So if it is possible to have some co-ordination between this two providers to share resources mutually, making client fully unaware of whats going on in the background....? Please reply.. I am sorry if I'm doing mistake anywhere... Thanks in advance :)

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• How does the process of disk partitioning actually work on most HDD's?

  - by Dark Templar

  From what I know of most laptops, you are able to "partition" your disk into as many other drives as you please. The more you cut it up, the smaller your partitions are, but from an organizational point of view, this may be desirable... I was wondering how the filesystem itself becomes partitioned underneath the partitions visible to the user. For instance, a laptop disk is usually divided into platters, each with two surfaces. The surfaces are further divided into "tracks". I guess what I am asking is, is it possible to identify how the disk itself keeps track of partitions? (whether each partition has its own platter? each partition has its own set of adjacent tracks? or some other configuration, or whether the data from different partitions are just randomly interleaved and scattered throughout the disk?)

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• Graphic Setup tune-up checklist

  - by Click Ok

  I was trying to play the game Warzone 2100 and the games runs fine, with nice speed, but the screen stays with a horizontal lines "flickering"... My PC have a integrated GeForce Go 6100 vga. Ok, not a powerfull vga, but it's not the end of the world to run a "simple" game like this (compared with another games that ask you send your eyes to purchase a expensive vga). So, I think that the problem can be of the configuration of my machine. I use it in first instance for programming jobs, so I underpay attention to video setup. I would like about a checklist to know if my PC is "ready" to games. By example, I know that I need: Lastest vga drivers Updated DirectX and OpenGL What you suggest? There is too some good programs to test performance and suggests improvements in the system? Thank you! PS: I'm using Windows 7

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• growing EBS RAID volume

  - by Ryan Fernandes

  I've created a RAID0 configuration with two 1GB EBS volumes, mounted at /dev/md0 using mdadm and formatted with XFS Next, I copied some files over to fill the volume to around 30% of its capacity (of 2GB) I then created snapshots of the volumes using ec2-consistent-snapshot and created volumes of the said snapshots but specified the volume size to be 2GB (effective doubling the capacity on each disk) I then spun up a new instance, assembled the RAID0 configuration on /dev/md0 from the 2 volumes mentioned above and mount it to /vol df -hT showed /vol as 2GB (as expected) Now I ran sudo xfs_growfs -d /vol. The command completed normally but reported blocks changed from 523776 to 524160 (only!) and df -hT still showed /vol as 2GB (instead of the expected 4GB) I rebooted, remounted, reassembled the RAID but it still reports the old size. EDIT: trying to grow the RAID using mdadm --grow yields mdadm: raid0 array /dev/md0 cannot be reshaped Is there any other way I can grow a RAID0 array?

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• Moving an object using its velocity on a closed curve

  - by Futaro

  I want that an object follows a path, in Peggle game there are some pegs that have movement in a closed path. How can i get the same result? I guess that I can use parametric curve but I need use the velocity and not the position (x, y). I use NAPE and I have this in my gameloop: //circunference angle = angle + 1*(Math.PI / 180); movableBall.position.x = radius * Math.cos(angle)+ h; movableBall.position.y = radius * Math.sin(angle)+ k; it's works but I can not control the velocity, each movableBall must have its own velocity. Besides, from docs of NAPE:"Setting the position of a body is equivalent to simply teleporting the body; for instance moving a kinematic body by position is not the way to go about things.." I want to use: movableBall.velocity.x =?? movableBall.velocity.y = ?? The final idea is to follow others paths like the Lemniscate of Bernoulli. Thanks!

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• Mail sent from local Postfix marked as "possible phishing" in Outlook

  - by leo grrr

  Hi folks, Sorry for the newbie question--this is not my area of expertise by a long shot. I work at a small development shop and we finally got around to doing code reviews. (Yay!) I set up an instance of Review Board -- an open-source code review tool -- on one of our local servers but it doesn't seem to like talking to our hosted Exchange server to send notification emails. I decided to just install Postfix on that same box and send mail from localhost, which is working much more reliably, but Outlook disables all links in the email announcements and marks it as possible phishing. What is making these emails look suspicious and what can I change? Would the best thing be to figure out how to relay to Exchange from Postfix? Thanks!

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• Offshoring: does it ever work?

  - by DanSingerman

  I know there has been a fair amount of discussion on here about outsourcing/offshoring, and the general opinion seems to be that at best it is difficult, and at worst it fails. I have direct experience of offshoring myself; a previous company where I was a dev manager wanted to send some development offshore, and we ran a pilot scheme to see how well it would work. Of course it was a complete failure, although it is not completely clear to me whether this was down to the offshore devs being less talented, the process, or other factors (no doubt it was really a combination). I can see as a business how offshoring looks attractive (much lower day rate), but as far as I can see, the only way it could possibly work is if you do exceptionally detailed design up front, with incredibly detailed specifications; and by the time you have invested in producing that, you have probably spent as nearly as much as if you had written the actual code locally (which I think is an instance of No Silver Bullet) So, what I want to know is, does anyone here have any experience of offshoring actually working ever? Especially if there are any success stories of it working in a semi-agile way? I know there are developers here from all over the World; has anyone worked on an offshore project they consider successful?

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• Find Files That Contain Both Words in Notepad++

  - by SethO

  In Notepad++ (v5.9), I want to search for files which contain two words. For example, I would like to find all text files in a directory that have both Alpha and Bravo in the file. They may not be next to each other and they may have multiple occurrences of either. I just want to find the files that have at least one instance of each. Is there a way to structure this search without resorting to Regular Expressions? Thanks for the advice.

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• Unable to change IP address for eth0 without restart in Ubuntu

  - by Rodnower

  I have Ubuntu 12.04.1 installed. I tried to change the IP address of the interface eth0 in /etc/network/interfaces from 192.168.1.3 to 192.168.1.4 auto lo iface lo inet loopback pre-up iptables-restore < /etc/iptables.up.rules auto eth0 iface eth0 inet static address 192.168.1.4 gateway 192.168.1.1 netmask 255.255.255.0 network 192.168.1.0 broadcast 192.168.1.255 sudo service networking status When I issue: sudo service networking restart I get this response: stop: Unknown instance: networking stop/waiting And IP remains 192.168.1.3: eth0 Link encap:Ethernet HWaddr 00:1e:33:71:cd:a4 inet addr:192.168.1.3 Bcast:192.168.1.255 Mask:255.255.255.0 inet6 addr: fe80::21e:33ff:fe71:cda4/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:3861 errors:0 dropped:0 overruns:0 frame:0 TX packets:3291 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:3423285 (3.4 MB) TX bytes:521854 (521.8 KB) Interrupt:45 Base address:0x4000 Only after restart does the IP change. Any ideas?

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• Amazon EC2 vs Dedicated server at Hetzner, what's the use for EC2?

  - by C-Blu

  After searching the web I still can't find the reason to use EC2. What's the point to scale EC2? If you expect a huge burst in traffic, they say. OK, but what if you already have a couple of sites with good traffic, and for example medium reserved EC2 instance is not enough. You are paying $36.60(medium reserved for 1year) in EU(Ireland) + traffic + optional expenses for databases and S3 if you use them. Of course as some point when you are under $56.6-$66.1 you can optimize your hosting costs with Amazon EC2. But when you get at some point if purchase EX4 server from Hetzner, it will surpass your perfomance needs for a long time, before you get a massive traffic. (I am wrong?) CPU: i7-2600 Quadcore (3.4-3.8 Ghz) RAM: 16 GB HDD: 2x3 TB SATA (6 Gbit/s) - I think that disc performance of a dedicated is better then of Amazon EBS Traffic: 10 TiB in month included. This is what you get from Hetzner for $56(- 19% VAT) or $66 for EU residents. Please, tell me what's the reason to use Amazon? Which load won't a server from Hetzner take, but Amazon Auto Scaling will? The maintenance of dedicated vs EC2 is still the same? Or hardware failure at Amazon, won't ruin your EBS storage? I'm still not at the level when I need expensive hosting, but want to know beforehand, just to be sure if Amazon infrastructure is better then pure performance of Hetzner's hardware.

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• Preferred way for dealing with customer-defined data in enterprise application

  - by Axarydax

  Let's say that we have a small enterprise web (intranet) application for managing data for car dealers. It has screens for managing customers, inventory, orders, warranties and workshops. This application is installed at 10 customer sites for different car dealers. First version of this application was created without any way to provide for customer-specific data. For example, if dealer A wanted to be able to attach a photo to a customer, dealer B wanted to add e-mail contact to each workshop, and dealer C wanted to attach multiple PDF reports to a warranty, each and every feature like this was added to the application, so all of the customers received everything on new update. However, this will inevitably lead to conflicts as the number of customers grow as their usage patterns are unique, and if, for instance, a specific dealer requested to have an ability to attach (for some reason) a color of inventory item (and be able to search by this color) as a required item, others really wouldn't need this feature, and definitely will not want it to be a required item. Or, one dealer would like to manage e-mail contacts for their employees on a separate screen of the application. I imagine that a solution for this is to use a kind of plugin system, where we would have a core of the application that provides for standard features like customers, inventory, etc, and all of the customer's installed plugins. There would be different kinds of plugins - standalone screens like e-mail contacts for employees, with their own logic, and customer plugin which would extend or decorate inventory items (like photo or color). Inventory (customer,order,...) plugins would require to have installation procedure, hooks for plugging into the item editor, item displayer, item filtering for searching, backup hook and such. Is this the right way to solve this problem?

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• Functional Programming, JavaScript and UI - some neophyte questions

  - by jamesson

  This has been discussed in other threads, however I am hoping for some comments relevant to UI and an explanation of some vitriol I had flung my way in a Certain IRC Channel Which shall remain nameless. In the discussion here, the comments in the accepted answer suggest that I approach the given code from a functional perspective, which was new to me at the time. Wikipedia said, among other things, that FP "avoids state and mutable data", which includes according to the discussion global vars. Now, being that I am already pretty far along in my project I am not going to learn FP before I finish, but... How is it possible to avoid global vars if, for instance, I have a UI whose entire functionality changes if a mousebutton is down? I have a number of things like this. Why was there a strong negative reaction in the Certain IRC channel to implementing FP in JS? When I Brought up what seemed to me to be supportive comments by Crockford, people got even madder. Now, this being IRC there is no rep system, but they at least gave indication of having read TGP (which I haven't gotten to yet) so I'm assuming they're not idiots. Many thanks in advance Joe

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• How to convince non-programmer his notions about computers are wrong?

  - by Suma

  Recently I came across a question about 64b on SuperUser for which the accepted answer seemed like a complete nonsense to me. I made two comments pointing out obvious mistakes. To my perplexion, the comments had an effect of the poster of the answer being alienated. I have no idea how could I convince him he is wrong, as he does not seem to understand the basics of the problem. He seems to be mixing concepts like bus size and address size - see the pearl sentence "it will allow you to address all of your RAM because your processor is reading from your RAM in 64 bit words.". The poster asks me to provide proves of my claim by quoting a respectable source, but I have no idea where to find such source, as I doubt anything I would consider relevant would be relevant for him (it would be probably too technical). I think this instance can serve as an illustration of communication problems between programmers and users (and to certain extent even to any expert vs. non-expert communication). How should a programmer handle a communication like this, so that is does not become a useless quarrel?

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• How to limit router bandwidth?

  - by David

  Hello, Is there a way to configure my (D-Link DIR-615) router to throttle down the allowed bandwidth after a certain amount of bandwidth has been used? For instance, I want my router to operate normally up to 20GB. After 20GB I want the router to limit bandwidth to a fraction of the normal speed (perhaps 1/5th). I live in Canada, so in about a month, everyone is going to be billed based on the amount they used (usage based billing). Instead of the unlimited bandwidth that I am enjoying now, most people will be capped at 25GB and will have to fork out $2/GB of over usage. Thank you in advance for the help.

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