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• Nginx Tornado Combination Causing 502 Bad Gateway Errors

  - by PlaidFan

  We are facing a problem with inconsistent 502 errors and tracking down the reasons has been a very frustrating exercise. We can reproduce the problem by sending several simultaneous requests quickly. The problem is that several is only in the range of 10 to 20 within a 5 seconds (not a typo). So clearly this type of load should be handled easily. We really like the Nginx + Tornado approach but are considering going to a more traditional (e.g. threading) approach because this problem has been very difficult to solve. I was wondering if you a) know how to fix this issue and b) how we can tracked down the culprit(s). The log files simply identify there being a connection refused. We have the same problem as this post: How do I debug a HTTP 502 error? But there is no answer provided on how to solve the problem so I'm hoping you can help because this may be a common issue with this type of setup. Thanks in advance, Paul

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• My server's been hacked EMERGENCY

  - by Grant unwin

  I'm on my way into work at 9.30 p.m. on a Sunday because our server has been compromised somehow and was resulting in a DOS attack on our provider. The servers access to the Internet has been shut down which means over 5-600 of our clients sites are now down. Now this could be an FTP hack, or some weakness in code somewhere. I'm not sure till I get there. How can I track this down quickly? We're in for a whole lot of litigation if I don't get the server back up ASAP. Any help is appreciated. UPDATE Thanks to everyone for your help. Luckily I WASN'T the only person responsible for this server, just the nearest. We managed to resolve this problem, although it may not apply to many others in a different situation. I'll detail what we did. We unplugged the server from the net. It was performing (attempting to perform) a Denial Of Service attack on another server in Indonesia, and the guilty party was also based there. We firstly tried to identify where on the server this was coming from, considering we have over 500 sites on the server, we expected to be moonlighting for some time. However, with SSH access still, we ran a command to find all files edited or created in the time the attacks started. Luckily, the offending file was created over the winter holidays which meant that not many other files were created on the server at that time. We were then able to identify the offending file which was inside the uploaded images folder within a ZenCart website. After a short cigarette break we concluded that, due to the files location, it must have been uploaded via a file upload facility that was inadequetly secured. After some googling, we found that there was a security vulnerability that allowed files to be uploaded, within the ZenCart admin panel, for a picture for a record company. (The section that it never really even used), posting this form just uploaded any file, it did not check the extension of the file, and didn't even check to see if the user was logged in. This meant that any files could be uploaded, including a PHP file for the attack. We secured the vulnerability with ZenCart on the infected site, and removed the offending files. The job was done, and I was home for 2 a.m. The Moral - Always apply security patches for ZenCart, or any other CMS system for that matter. As when security updates are released, the whole world is made aware of the vulnerability. - Always do backups, and backup your backups. - Employ or arrange for someone that will be there in times like these. To prevent anyone from relying on a panicy post on Server Fault. Happy servering!

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• Rotate a vector

  - by marc wellman

  I want my first-person camera to smoothly change its viewing direction from direction d1 to direction d2. The latter direction is indicated by a target position t2. So far I have implemented a rotation that works fine but the speed of the rotation slows down the closer the current direction gets to the desired one. This is what I want to avoid. Here are the two very simple methods I have written so far: // this method initiates the direction change and sets the parameter public void LookAt(Vector3 target) { _desiredDirection = target - _cameraPosition; _desiredDirection.Normalize(); _rotation = new Matrix(); _rotationAxis = Vector3.Cross(Direction, _desiredDirection); _isLooking = true; } // this method gets execute by the Update()-method if _isLooking flag is up. private void _lookingAt() { dist = Vector3.Distance(Direction, _desiredDirection); // check whether the current direction has reached the desired one. if (dist >= 0.00001f) { _rotationAxis = Vector3.Cross(Direction, _desiredDirection); _rotation = Matrix.CreateFromAxisAngle(_rotationAxis, MathHelper.ToRadians(1)); Direction = Vector3.TransformNormal(Direction, _rotation); } else { _onDirectionReached(); _isLooking = false; } } Again, rotation works fine; camera reaches its desired direction. But the speed is not equal over the course of movement - it slows down. How to achieve a rotation with constant speed ?

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• After reboot allocated node gets commissioned again

  - by cloudfan

  i had set up a maas with juju and deployed Openstack into it for testing. During my vacation i shut down all computers. Afterwards i started at first the maas server, then the node where juju was bootstrapped and juju-gui was deployed to. Sadly the node got commissioned again and so all my deployments are gone. I decomissioned the according node from the maas and bootstrapped it again. Afterwards i tested again juju bootstrapping the node, shutting down both nodes and starting them in the same order again. The Juju node gets commisioned again. After bootstrapping everything looked fine in the MAAS GUI (node was set to allocated to root, which was also the case after the restart) and also the JUJU GUI was available and juju status worked fine. Before my vacation i also had some other nodes deployed through juju. They all seem to be still available and have not been commisioned again. Do you have any ideas what might have happened? Is there any issue with a bootstrapped juju node and the commisioning? Any help or hints on what i could check are appreciated! Thank in advance for your help!

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• Xorg and three button mouse: emulate more than scroll alone

  - by drumfire

  I'm happy with my three-button mouse. But it could have more functions. When I press the middle button (button 2) and move the mouse, I can scroll up/down and left/right. xev shows me that when I drag the mouse with button 2 pressed it actually emulates button 4 (scroll up), 5 (down), 6 (left) and 7 (right). But can we take this further? For example, I would like to emulate button 8 if I press button 1 and 2 together, and button 9 if i press button 2 and 3. This would allow me to have the 'back' and 'forward' functionality in my browser. It would also be nice to get more functionality by pressing, for example, shift+mouse1, alt+mouse2. You could have a whole new set of emulated keys. Can this be done and if yes, then how?

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• Multiple Issues - USB booting Ubuntu 12.04

  - by Pixelishus

  I've been using a Ubuntu 12.04 off a bootable USB stick so I can have a portable OS. Also, OS variety. I've been using it for a while and I'm still have a few issues. First and most annoying, it often lags/freezes. I'm not sure what word you would use for it, windows will often stop working and go dark/not responding from anywhere between 10 seconds to a full minute and on some occasions, even longer. However, the window eventually starts working again. Similarly, sometimes the whole system will freeze, not just the window. The mouse will still move, but nothing will work. No clicking, no menus, not keyboard shortcuts. Again, it will usually start working. I'm liking Ubuntu a lot, but those issues can make it annoying to use sometimes. For example, it will ALWAYS freeze at some point if I try to watching a Youtube video and I'll have to wait for a minute or so until it starts responding, again. Aside from the lag/freezing, anytime I download packages, it will always say "package operation failed" when it's done, though it does seem to download/install. Another issue I'm having is with shutting down. If I open the logout/shutdown menu and click shutdown, it just logs me out and takes me to the login screen. If I try shutting down through the login screen, it won't do anything. As if I didn't even go to it. I've been using the terminal to reboot or shutdown when I need to. I've looked around for answers for all of these problems and still have yet to find a solution that works. Are these just normal issues with USB booting? I haven't installed Ubuntu to any computers, I've always done USB booting.

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• Using Queries with Coherence Read-Through Caches

  - by jpurdy

  Applications that rely on partial caches of databases, and use read-through to maintain those caches, have some trade-offs if queries are required. Coherence does not support push-down queries, so queries will apply only to data that currently exists in the cache. This is technically consistent with "read committed" semantics, but the potential absence of data may make the results so unintuitive as to be useless for most use cases (depending on how much of the database is held in cache). Alternatively, the application itself may manually "push down" queries to the database, either retrieving results equivalent to querying the cache directly, or may query the database for a key set and read the values from the cache (relying on read-through to handle any missing values). Obviously, if the result set is too large, reading through the cache may cause significant thrashing. It's also worth pointing out that if the cache is asynchronously synchronized with the database (perhaps via database change listener), that an application may commit a transaction to the database, then generate a key set from the database via a query, then read cache entries through the cache, possibly resulting in a race condition where the application sees older data than it had previously committed. In theory this is not problematic but in practice it is very unintuitive. For this reason it often makes sense to invalidate the cache when updating the database, forcing the next read-through to update the cache.

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• Making a class pseudo-immutable by setting a flag

  - by scott_fakename

  I have a java project that involves building some pretty complex objects. There are quite a lot (dozens) of different ones and some of them have a HUGE number of parameters. They also need to be immutable. So I was thinking the builder pattern would work, but it ends up require a lot of boilerplate. Another potential solution I thought of was to make a mutable class, but give it a "frozen" flag, a-la ruby. Here is a simple example: public class EqualRule extends Rule { private boolean frozen; private int target; public EqualRule() { frozen = false; } public void setTarget(int i) { if (frozen) throw new IllegalStateException( "Can't change frozen rule."); target = i; } public int getTarget() { return target; } public void freeze() { frozen = true; } @Override public boolean checkRule(int i) { return (target == i); } } and "Rule" is just an abstract class that has an abstract "checkRule" method. This cuts way down on the number of objects I need to write, while also giving me an object that becomes immutable for all intents and purposes. This kind of act like the object was its own Builder... But not quite. I'm not too excited, however, about having an immutable being disguised as a bean however. So I had two questions: 1. Before I go too far down this path, are there any huge problems that anyone sees right off the bat? For what it's worth, it is planned that this behavior will be well documented... 2. If so, is there a better solution? Thanks

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• No keyboard after suspend, even after hard reset

  - by subatomics

  all. While I was using a Ubuntu 9.1 live CD, I put the computer (Toshiba Satellite C655) into standby. After I resumed, the keyboard stopped functioning, though the mouse (USB) still worked. I decided to turn off the computer, but after Ubuntu shuts down, it asks you to press "enter" to actually turn the machine off. The keyboard was still dead, so I all I could do was use the on/off switch to power down the computer. Now, when I try to boot the computer, nothing happens. Before this problem, I would see a menu asking me to select an OS (I had Windows 7 and Windows XP installed). I cannot use any emergency measures because I need to press F12 to boot from a CD, and the keyboard is still not working. I tried removing the HD to force a boot from the CD, but it didn't work. I also tried to plug in a USB keyboard, which failed as well. Right now, I have no idea how to fix this. Any ideas? Thanks.

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• Is it safe to change the time on hosting VM server?

  - by hydroparadise

  So, I noticed there's about a 10 minute drift on my VM hosting server from what time it's supposed to be. In traditional environments, I would just restart the system (and change the BIOS time if necassary). The hosting server is Ubuntu 12.04. Undertsanding that some process could be time sensitive (NTP?), I was wondering how this might affect the relation between the host and hosted system (currently hosting 4: 3 Ubuntu 12.04 servers with one being a web server, and 1 Windows Server 2008 file server). I am using Virtual Box 4 with it's headless option. Ultimately, I am trying to avoid from shutting down the host (which ultimately mean shutthing down the other hosted systems). Is this safe?

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• MS Access ADP front end and SQL Server back end for field data collection?

  - by Brash Equilibrium

  I am an anthropologist. I am going to the field and will use a netbook to collect survey data. The survey forms will need to allow me to enter data into multiple tables, search tables, allow subforms, and be fast enough to not slow down my interview. I have considered storing the data in a SQL Server Express 2008 R2 server (there will be a lot of data) while using a Microsoft Access data project as a front end. To cut down the number of steps required to collect and store data, I'm considering using the netbook for both data storage and collection (after reading this article about SQL Server on a netbook). My questions are: (1) Is there a simpler solution that is also gratis (gratis because I already have a MS Access license from my workplace, and SQL Server Express is, obviously, free)? (2) Does my idea to store and collect data using the netbook make sense? Thank you.

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• Can't get nmap to work under Windows 7 64 bit

  - by jitbit

  I'm trying to install and run the nmap tool to test my server, but it keeps saying Note: Host seems down. If it is really up, but blocking our ping probes, try -P0 and showing all the server ports are closed. Which is not true - the server is up and has lots of open ports. Any ideas? UPDATE: Just to clarify - the server can be pinged and port-scanned fine by other programs. It's juts nmap that does not work. Even "google.com" seems to be down for nmap.

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• I believe I need a wireless access point, but can I do it with a wifi router?

  - by Flotsam N. Jetsam

  My needs are simple, I think: I have a laptop upstairs with a usb wifi that I use to connect to my neighbor's wifi which I share (with their knowledge). I have a laser printer downstairs that my wife doesn't wants to stay down there (big, bulky and ugly), but that we both need to print stuff off. It has wired networking and I have wired hub and router down there. The usb wifi on the laptop has absolutley the best reception I've ever seen or heard of. I cannot get onto the neighbor's net with the thing downstairs though--sortof in the ground. What do I need downstairs to give printer access to my laptop wirelessly? One thing I can't do in this solution is have a computer on downstairs, so I would think that would eliminate a usb solution.

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• spontaneous hard disk password

  - by sc

  I had an HP proliant server go down recently. All of the sudden the sas controller (e200i) would not see any of the physical disks. New disks were detected just fine. I thought it was odd that all 6 disks would go down at one time so sent them to a data recovery firm to find out what happened. I'm being told that, somehow, all of the disks were spontaneously password protected. These are Hitachi 2.5" drives and I guess this is something of a known issue. The company has worked for a while to try and recover them, with no luck. Has anyone had experience with this? Any recommendations for how to recover the drives or a company that might have the expertise to do so?

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• How can I make this arcade-highscore game more fun/interesting?

  - by j-a

  I'm having difficulties getting the fun factor into this iPhone game, and I am looking for some ideas or advice. I was asked to generalize the question a bit. What are some techniques for arcade highscore games that can be applied to this game in order to: Make each second of the game fun and challenging, from the first second to the end of the game. Regardless of skill level. Make the player want to try again and again to beat the high score. Briefly about the game: you aim using your finger and pull the bow chord and release by lifting your finger. That part feels quite nice how the bow interacts with the finger. The game idea: hearts fall down and you get 1 pt for each heart you shoot. You start with a few arrows and every now and then a bag of arrow comes down which - if you hit it, you get more arrows. Once your out of arrows the game is over. So it is all about beating your previous high score or your friends high scores. Unfortunately I don't find it that fun. Thankful for any ideas/suggestions/thoughts on how to make it more fun/interesting.

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• Network card dies when trying to wake up laptop from sleep

  - by Bugmaster

  I have a Dell XPS 1640 laptop (aka Dell Studio XPS 16), running Vista. Whenever the laptop wakes up from sleep, my Broadcomm LAN card immediately dies. Any attempt to access it completely locks up whichever program I use to access it. There appears to be no way to re-awaken the card, other than rebooting; note that Vista does not even shut down properly if some program is waiting for the card. So far, I have tried the following: Disabled the "allow your computer to shut down this device to save power" in the device properties. This had no effect. Attempted to disable and then enable the card in the device properties. No effect. Tried ipconfig /renew: this locks up ipconfig to the point where I can't even kill its process. Force-install updated drivers from broadcomm: no effect. Does anyone have any other ideas ?

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• How to find what is written to filesystem under linux

  - by bardiir

  How can i find out what processes write to a specific disc over time? In my particular case I got a little homeserver running 24/7 and I included a script in the crontab to shutdown all drives that are not used (no change in /proc/diskstats for 15 minutes). But my system disc won't come down at all. I'm suspecting logs but it's probably not only logs writing to the filesystem on the system disk and I don't want to go all the way moving the logfiles to something else just to find out the disc still doesn't spin down and there's nothing i can do against it.

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• How can I determine the first visible tile in an isometric perspective?

  - by alekop

  I am trying to render the visible portion of a diamond-shaped isometric map. The "world" coordinate system is a 2D Cartesian system, with the coordinates increasing diagonally (in terms of the view coordinate system) along the axes. The "view" coordinates are simply mouse offsets relative to the upper left corner of the view. My rendering algorithm works by drawing diagonal spans, starting from the upper right corner of the view and moving diagonally to the right and down, advancing to the next row when it reaches the right view edge. When the rendering loop reaches the lower left corner, it stops. There are functions to convert a point from view coordinates to world coordinates and then to map coordinates. Everything works when rendering from tile 0,0, but as the view scrolls around the rendering needs to start from a different tile. I can't figure out how to determine which tile is closest to the upper right corner. At the moment I am simply converting the coordinates of the upper right corner to map coordinates. This works as long as the view origin (upper right corner) is inside the world, but when approaching the edges of the map the starting tile coordinate obviously become invalid. I guess this boils down to asking "how can I find the intersection between the world X axis and the view X axis?"

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• How to check if cell contains a value of another cell

  - by Antonio Oliveira

  Here is the scenario: On column A each cell has random text within it (names, address, account numbers, etc). Column A extends down to over 40 thousand rows. On column B I have a list of (account) numbers. Column B extends down to about 5 thousand rows. I need to filter column A to show only the rows that contain the account numbers that are part of column B. Neither column A nor B are in any specific order. I think he above scenario speaks for itself, but I can provide a quick example if needed (don't want to over complicate it).

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• Can we change control of two keys on keyboard?

  - by mr_eclair

  I'm using Eliteook 8440p hp machine and two keys on my keyboard aren't working v and b. laptop keyboard replace will take 2-3 days, and I can't stop my office work. I'm bored of using On screen keyboard to write v and b. I don't have any portable USb keyoard to connect to laptop right now. I'm thinking I'm not using Pg up and Pg Down button at all, is there any software or trick which can make it possible so that If i press Pg Up it will write v on page and Pg Down will write b. Hoping for quick and positive response.

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• sql server express

  - by neil

  I use MS Acess as the front end. Loaded SQL Server 2008 R2 on my laptop. On my laptop (which I want to run the sql/access locally), there is no drop down listing. Under my normal Network (Sql 2000 enterprise edition) condition, the server name is part of the drop down listing. Finally got an ODBC positive test by manually listing in the system dns ODBC connection 'computername\sqlexpress'. Nonetheless, can not get an ODBC connection from Access. How can I get it working?

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• Error connecting ESX 5.0.0 to domain

  - by Saariko

  I am trying to connect an ESX 5.0.0 to our Domain Controler, in order to give a Domain group specific roles security. But I do not see any groups after the host connects to the domain. Under Configuration - Authentication Services - I connected the host to the domain: I created the role I wanted, with the selected approved features But when I want to add a permission to a set of VM's, I can not see "my domain" on the drop down, only the: "localhost" How do I see "my domain" on the Domain drop down - so I can select the domain group to give the role to? To note: I followed the instructions to connect to the domain form VMware site.

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• Issue with increasing the root partition from the swap

  - by user211761

  I have an issue with increase the size of my root partition. I have ElementaryOS Luna, and while installing it asked me how much space I want to use. I choosed 15 GB for it, because I want to use this as an alternative system. The issue is that after the installation was complete, I found out that my root partition is only 7 GB big, and SWAP is 8 GB which is useless cuz I have 8 GB of RAM. Now I want to shrink the swap and increase the size of my root partition, so I booted the LiveCD and used GParted. I shrinked the swap without any problems, but now I cant add that free space to any partition. I also turned Swap off. I would add a picture, but I need at least 10 reputation to post images ( Stupid ) Its also worth mentioning that in Gparted its showing my partition in a different way. I would post an image BUT I CANT, so I need to write it down. Its something like this [Pointing arrow down] /dev/sda4 Extended /dev/sda5 ntfs /dev/sda6 ext4 (Which is my main partition) /dev/sda7 linux-swap unallocated Picture:

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• Binding keys from specific device in X.org

  - by Michal Cihar

  I have a remote control for presentations, which generates Next/Prior key events in X.org (Page up/down). I'd like to use these for navigating in playlist (using MPD, but it probably does not matter). The problem is that I want to make this control work all the time (without application having focus) and I don't want to lose Page up/down functionality from normal keyboard. Is there some application which would allow me to bind actions to events from specific keyboard? Or is there simple way to implement such thing on my own?

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• CUDA 4.1 Particle Update

  - by N0xus

  I'm using CUDA 4.1 to parse in the update of my Particle system that I've made with DirectX 10. So far, my update method for the particle systems is 1 line of code within a for loop that makes each particle fall down the y axis to simulate a waterfall: m_particleList[i].positionY = m_particleList[i].positionY - (m_particleList[i].velocity * frameTime * 0.001f); In my .cu class I've created a struct which I copied from my particle class and is as follows: struct ParticleType { float positionX, positionY, positionZ; float red, green, blue; float velocity; bool active; }; Then I have an UpdateParticle method in the .cu as well. This encompass the 3 main parameters my particles need to update themselves based off the initial line of code. : __global__ void UpdateParticle(float* position, float* velocity, float frameTime) { } This is my first CUDA program and I'm at a loss to what to do next. I've tried to simply put the particleList line in the UpdateParticle method, but then the particles don't fall down as they should. I believe it is because I am not calling something that I need to in the class where the particle fall code use to be. Could someone please tell me what it is I am missing to get it working as it should? If I am doing this completely wrong in general, the please inform me as well.

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