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  • Which AMI to to use for Java/Tomcat/MySQL in Amazon EC2?

    - by Justin
    I originally posted this on stackoverflow.com and it was suggested serverfault.com might be a better place to ask this question. So here goes: I'm trying to determine which Amazon Machine Image (AMI) to use as my Virtual Server in Amazon's EC2. For now, I'll need to choose an AMI that complies with the AWS Free Usage Tier. I want to deploy a Java app that I've been developing using Eclipse on Windows XP, Tomcat 7 and MySQL 5.5. I'm aware that I can choose the Basic 32-bit Amazon Linux AMI. Then I'd manually install Tomcat and MySQL (does MySQL get installed on the image or separately on an Elastic Block Store (EBS)?). Here's the rub, I'm a bit of a Linux noob. I can start Tomcat and tail the logs and such on Linux but I'm not familiar with the install process for Tomcat and MySQL on Linux and commands like sudo and chmod. I'm happy to get more hands on with Linux but I'm short on time right now. Are there AMI's that already have Tomcat and MySQL bundled? The Request Instance Wizard shows 805 Community AMI's that are Free Tier Eligible. 51 of the Free Tier Eligible AMI's have "Tomcat" in their name. I'm willing to consider using Elastic Beanstalk but my research thus far hasn't found any discussion of using MySQL with Beanstalk. The discussions all seem to use Amazon's SimpleDB. Any advice is greatly appreciated.

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  • Will Software RAID And iSCSI Work For A SAN

    - by Justin
    I am looking for a SAN solution, but can't afford even entry level solutions. Basically, the SAN is for development and a proof of concept product. The performance doesn't have to be amazing, but needs to be functional. My buddy says we should just setup sotware RAID and software iSCSI in Linux. Essentially I have a spare server with dual Xeon processors, 4GB of memory, and (2) 500GB 7200RPM drives. It's a bit old but working. I am sure there is reason people don't do software RAID and iSCSI, but will performance be usable? Thinking of configuring the drives in RAID 0 (for performance).

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  • Capturing a firewire video feed in Leopard on a G4

    - by Justin Dearing
    Hi, I have a powerbook G4 that I loaded up with Leopard (OSX 10.5). I don't have iMovie, since the Leopard version requires an intel mac. I have a Sony Digital 8 Camcorder with firewire and usb output. The usb output requires a special driver on windows. I don't think OSX will support it. I wish to capture the video stream from the camera on my G4. VLC does not support firewire capture on OSX, I don't want to pay for QT professional. I'm looking for a solution. I'd prefer open source, but I'd consider freeware and inexpensive for pay options. On a related note, if it can capture still frames, I have a related question.

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  • What do YOU use for your Windows Server backup solution?

    - by Justin Higgins
    I know there are many choices, from builtin ntbackup, to FOSS, to commercial to custom script, but I was wondering what YOUR choice is for your servers and environment and a brief explanation of why. As each environment and requirements differ, there is no one right solution, except that you should be backing up and verifying restoration regularly. As a bonus, do you use D2D2D? D2D2T? D2D2Cloud?

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  • Safe to Use an Amazon EBS Volume While Snapshot in Progress?

    - by Justin Noel
    Is it safe to use an EBS volumne while a snapshot is being created? I've currently got a 100Gb EBS volume mounted. I am in the process of snapshotting it. Goodness it's slow!! It's going to end up taking more than 45 minutes to snapshot. My question : Is the EBS volume already copied and just being saved somewhere? Or, is the snapshot actively copying from my mounted volume right now? Basically, if I start using it before the snapshot completes, am I hosed? I just can't believe it takes this long to copy. There really isn't even 100GB in use. It's more like 25Gb.

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  • OS2/Warp - Remotely Stop and Restart a Program

    - by Justin S
    Our current phone system runs off of a legacy OS2/Warp box. Periodically we have to log into the machine and restart OS2RSD.exe and then start it again and the phone system starts working again. The problem is we have to physically get in front of the box and use the GUI to stop and restart the process. Is it possibly to remotely run a script to kill OS2RSD.exe if its running and then start it again? I have been unable to figure this out on my own. The OS is OS2/Warp Version 3 if that helps.

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  • Unable to connect to Windows VPN from iPad

    - by Justin
    I have a 16 GB iPad wifi I can't get to connect to VPN. The error I get is: "A connection could not be established to the PP server. Try reconnecting. If the problem continues, verify your settings and contact your Administrator." I have tried a variety of tasks to troubleshoot the issue: I have verified that another iPad on another network can connect to the VPN I am trying to connect to I can connect to this VPN from the same network the iPad uses on a Windows machine I have verified an iPhone user can connect to this VPN from a different network I have reset the iPad's network settings I have reset the entire iPad and restored settings I have compared my settings w/ a screenshot from the iPad that works and confirmed everything is correct I have used the IP address and domain name of our VPN server in the settings I have tried deleting the VPN settings in the iPad and recreating them I have verified in the logs of VPN server that I'm not even getting to the VPN server (no log entry) I have verified that I cannot VPN from the iPad on separate network (different ISP and router) Are there any other ways to troubleshoot VPN on an iPad?

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  • Parsing mathematical experssions with two values that have parenthesis and minus signs

    - by user45921
    I'm trying to parse equations like these which only has two values or the square root of a certain value from a text file: 100+100 -100-100 -(100)+(-100) sqrt(100) by the minues signs, parenthesis and the operator symbol in the middle and the square root, and I have no idea how to start off... I've got the file part done and the simple calculation parts except that I couldnt get my program to solve the equations in the above. #include <stdio.h> #include <string.h> #include <stdlib.h> #include <math.h> main(){ FILE *fp; char buff[255], sym,sym2,del1,del2,del3,del4; double num1, num2; int ret; fp = fopen("input.txt","r"); while(fgets(buff,sizeof(buff),fp)!=NULL){ char *tok = buff; sscanf(tok,"%lf%c%lf",&num1,&sym,&num2); switch(sym){ case '+': printf("%lf\n", num1+num2); break; case '-': printf("%lf\n", num1-num2); break; case '*': printf("%lf\n", num1*num2); break; case '/': printf("%lf\n", num1/num2); break; default: printf("The input value is not correct\n"); break; } } fclose(fp); } that is what have I written for the other basic operations without parenthesis and the minus sign for the second value and it works great for the simple ones. I'm using a switch method to calculate the add, sub, mul and divide but I'm not sure how to properly use the sscanf function (if I am not using it properly) or if there is another way using a function like strtok to properly parse the parenthesis and the minus signs. Any kind help?

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  • Lost "VGA Display" color profile in OS X

    - by Justin Love
    OS X Display settings used to have a color profile named VGA Display, which I found quite usefully for finding color problems before hooking up a projector. Currently, this profile (along with a number of others I've collected from projectors in the past year) is not available. I'm currently OS X 10.6.6 and my best guess is the profiles got wiped out during the last upgrade. None of the available color profiles seem to stink quite enough. Am I overlooking a renamed profile? Is there somewhere I could get a 'VGA Display' profile to install on my computer?

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  • Is an NTBackup of a MySQL data directory reliable

    - by Justin Dearing
    This question was asked on the MySQL forums in 2004 with no answers. I'm installing MySQL 5.0.x on a Windows 2003 Server for use with Drupal. I began to configure the backup with mysqldump when it occurred to me that an ntbackup taken using shadow copying should be reliable enough for backing up the database. Is there any flaw in my logic?

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  • How can I scan from Canon PIXMA MX700 without disabling OS X firewall?

    - by Justin Love
    I have a Canon PIXMA MX700 connected by ethernet. When I first bought it I was using OS X 10.4, and scanner-initiated scanning worked fine. After upgrading to 10.6, neither scanner-initiated or scanning from MP Navigator EX works with the firewall enabled. The firewall lists exceptions for three applications: Canon IJ Network Scan Utility.app Canon IJ Network Scanner Selector.app MP Navigator EX 1.0.app I get no further blocked warnings, and /var/log/appfirewall.log lists nothing for today (my latest attempt to use it).

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  • Trouble opening my router to my web server

    - by Justin Heather Barrios
    Here's the story. I have a webs server created and connected to my router. The website works great when I'm connected to the router, but when I'm off the network I can't access the website. I got the IP for my router by googling "what is my ip." I have opened ports 80 to 10080 to link to the server in the router. One odd thing that I don't understand. When I am in network if I access XXX.XXX.XX.XX:80 I can access the web page no problem. If I access XXX.XXX.XX.XX:81 (or any other port) I get the error "Cannot access server." Any idea what the problem could be? Could it be my ISP?

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  • Benefit of running redis as a daemon

    - by Justin Meltzer
    I'm trying to understand what the benefit of running redis as a daemon is. The redis default configuration seems not to run redis as a daemon, but locally on Mac OS X I added it to LaunchAgents, so I'm guessing it is running as a daemon anyway? Also on my remote application which is running on a linux server, since it won't have LaunchAgents (as far as I'm aware) will I have to run redis as a daemon? What will be the benefit of doing so?

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  • Sql-server-2008 client Access license

    - by thushya
    Hi, case 1 : i have one user makes 10 connection from single computer, maximum number of connection at a given time = 10, what is the number CAL i need here ? case 2 : i have 10 users have access to only 1 computer, 10 user connect from single computer - maximum connection at any given time = 1, what is the number CAL i need here ? case 3 : i have 10 users using 10 computers, all 10 are making total of 5 connection maximum in any given time, what is the number of CAL i need here ? Thanks.

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  • Allow application to access drive while blocking direct access from users in Server 2008r2?

    - by Justin Hawk
    In Windows Server 2008 R2, can I grant permission for a specific application to access a drive, while at the same time blocking users from viewing/browsing/reading that drive? Edit: Additional Info: Users are logged in to a terminal server. The application is a 3rd party rich GUI .exe, launched by the user. It stores large images files on the hard disk. I would like the user to only be able to access these files through the application, not by browsing the disk. The application does not have a service component.

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  • Particle trajectory smoothing: where to do the simulation?

    - by nkint
    I have a particle system in which I have particles that are moving to a target and the new targets are received via network. The list of new target are some noisy coordinates of a moving target stored in the server that I want to smooth in the client. For doing the smoothing and the particle I wrote a simple particle engine with standard euler integration model. So, my pseudo code is something like that: # pseudo code class Particle: def update(): # do euler motion model integration: # if the distance to the target is more than a limit # add a new force to the accelleration # seeking the target, # and add the accelleration to velocity # and velocity to the position positionHistory.push_back(position); if history.length > historySize : history.pop_front() class ParticleEngine: particleById = dict() # an associative array # where the keys are the id # and particle istances are sotred as values # this method is called each time a new tcp packet is received and parsed def setNetTarget(int id, Vec2D new_target): particleById[id].setNewTarget(new_target) # this method is called each new frame def draw(): for p in particleById.values: p.update() beginVertex(LINE_STRIP) for v in p.positionHistory: vertex(v.x, v.y) endVertex() The new target that are arriving are noisy but setting some accelleration/velocity parameters let the particle to have a smoothed trajectories. But if a particle trajectory is a circle after a while the particle position converge to the center (a normal behaviour of euler integration model). So I decided to change the simulation and use some other interpolation (spline?) or smooth method (kalman filter?) between the targets. Something like: switch( INTERPOLATION_MODEL ): case EULER_MOTION: ... case HERMITE_INTERPOLATION: ... case SPLINE_INTERPOLATION: ... case KALMAN_FILTER_SMOOTHING: ... Now my question: where to write the motion simulation / trajectory interpolation? In the Particle? So I will have some Particle subclass like ParticleEuler, ParticleSpline, ParticleKalman, etc..? Or in the particle engine?

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  • Why do we have to use break in switch

    - by trejder
    Who decided, and basing on what concepts, that switch construction (in many languages) has to be, like it is? Why do we have to use break in each statement? Why do we have to write something like this: switch(a) { case 1: result = 'one'; break; case 2: result = 'two'; break; default: result = 'not determined'; break; } I've noticed this construction in PHP and JS, but there are probably many other languages that uses it. If switch is an alternative of if, why we can't use the same construction for switch, as for if? I.e.: switch(a) { case 1: { result = 'one'; } case 2: { result = 'two'; } default: { result = 'not determined'; } } It is said, that break prevents execution of a blocks following current one. But, does someone really run into situation, where there was any need for execution of current block and following ones? I didn't. For me, break is always there. In every block. In every code.

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  • What is the value to checking in broken unit tests?

    - by Adam W.
    While there are ways of keeping unit tests from being executed, what is the value of checking in broken unit tests? I will use a simple example. Case sensitivity. The current code is Case Sensitive. A valid input into the method is "Cat" and it would return an enum of Animal.Cat. However, the desired functionality of the method should not be case sensitive. So if the method described was passed "cat" it could possibly return something like Animal.Null instead of Animal.Cat and the unit test would fail. Though a simple code change would make this work, a more complex issue may take weeks to fix, but identifying the bug with a unit test could be a less complex task. The application currently being analyzed has 4 years of code that "works". However, recent discussions regarding unit tests has found flaws in the code. Some just need explicit implementation documentation (ex. case sensitive or not), or code that does not execute the bug based on how it is currently called. But unit tests can be created executing specific scenarios that will cause the bug to be seen and are valid inputs. What is the value of checking in unit tests that exercise the bug until someone can get around to fixing the code? Should this unit test be flagged with ignore, priority, category etc, to determine whether a build was successful based on tests executed? Eventually the unit test should be created to execute the code once someone fixes it. On one hand it shows that identified bugs have not been fixed. On the other, there could be hundreds of failed unit tests showing up in the logs and weeding through the ones that should fail vs. failures due to a code check-in would be difficult to find.

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  • Whenever I hold alt/option and move my mouse, Mac OS X resizes my window... how do I stop that?

    - by Justin Searls
    I've been using Mac OS X for maybe 6 years now, and I have no idea what's causing this. Maybe someone else has this experience and can help me out. Symptom: while holding the alt/option key, if I move my mouse the current window starts resizing, anchored at the top left (it behaves exactly as if I had clicked-and-dragged the lower-right icon on the window). Anyone have an idea of what I may have installed that caused this? Or how to make it stop?

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  • Splitting Multiple Files in Windows

    - by Justin Boucher
    We have a 21TB LUN full of images that are approx 600K in size in multiple sub folders on the disk. We are trying to split the 21TB LUN into 8 smaller LUNs that are about 2.6TB a piece in order to process the images more effectively. My question is how we can determine what 2.6TB is on the drive? What is the best tool to mark this data so we can copy it to the new smaller LUNs with robocopy or emcopy without overfilling the smaller LUNs? Is there a third-party tool that would be better suited for this task? Thank you in advance for your assistance.

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  • Dealing with Fine-Grained Cache Entries in Coherence

    - by jpurdy
    On occasion we have seen significant memory overhead when using very small cache entries. Consider the case where there is a small key (say a synthetic key stored in a long) and a small value (perhaps a number or short string). With most backing maps, each cache entry will require an instance of Map.Entry, and in the case of a LocalCache backing map (used for expiry and eviction), there is additional metadata stored (such as last access time). Given the size of this data (usually a few dozen bytes) and the granularity of Java memory allocation (often a minimum of 32 bytes per object, depending on the specific JVM implementation), it is easily possible to end up with the case where the cache entry appears to be a couple dozen bytes but ends up occupying several hundred bytes of actual heap, resulting in anywhere from a 5x to 10x increase in stated memory requirements. In most cases, this increase applies to only a few small NamedCaches, and is inconsequential -- but in some cases it might apply to one or more very large NamedCaches, in which case it may dominate memory sizing calculations. Ultimately, the requirement is to avoid the per-entry overhead, which can be done either at the application level by grouping multiple logical entries into single cache entries, or at the backing map level, again by combining multiple entries into a smaller number of larger heap objects. At the application level, it may be possible to combine objects based on parent-child or sibling relationships (basically the same requirements that would apply to using partition affinity). If there is no natural relationship, it may still be possible to combine objects, effectively using a Coherence NamedCache as a "map of maps". This forces the application to first find a collection of objects (by performing a partial hash) and then to look within that collection for the desired object. This is most naturally implemented as a collection of entry processors to avoid pulling unnecessary data back to the client (and also to encapsulate that logic within a service layer). At the backing map level, the NIO storage option keeps keys on heap, and so has limited benefit for this situation. The Elastic Data features of Coherence naturally combine entries into larger heap objects, with the caveat that only data -- and not indexes -- can be stored in Elastic Data.

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  • Hourly CRON task running more frequently than one hour

    - by Justin
    I have a cron task that calls a special PHP script via wget. Here is the crontab entry: 0 * * * * wget http://www.... It will work perfect for several days, running on the hour. However, after a few days the cron job will start to be called several times an hour. I have never seen CRON drift like this, so I imagine it can't really be a CRON issue. However, the logs of the script that is called clearly show it running several times an hour. Server details: Ubuntu Luci Apache MySQL PHP5 Time is showing correct @ command line Server is setup to sync with a NTP server In order for the script to run it must be passed a unique 50-character hash key in the URL, so this script isn't being called from any other source accidentally. What might cause CRON to drift like this?

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  • ntbackup workalike for adhoc full backups in Windows 7 thats free and preferably open source

    - by Justin Dearing
    On windows 2000 and XP machines I used to be able to do the following: ntbackup backup systemstate c: /f e:\backups\machineName\machineName-full+systemstate_200101206.bkf This gave me a full backup of the system that I could use to do a system restore, after doing a barebones OS install. Windows 7 has a great utility for regular backups with alerting and all that stuff. It does not seem to have command line support. I'd like a backup solution for my Windwos 7 systems that has the following features: Is free Is open source (preferebly) Works while the system is booted and leaves the system functional (clonezilla is great for offline backups, and I use that too) Gives me a backup that is suited for a full system restore or partial system restore (ruling out most imaging software even if they could work while the system is booted via some sort of shadow copy voodoo) Can work via the command line Compression would be nice, the ability to pipe output would be better.

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  • Active Directory replication failing with Access is Denied

    - by Justin Love
    I recently discovered that Active Directory replication started failing about a month ago. If I attempt to Replicate Now from the failing domain controller, I receive The following error occurred during the attempt to synchronize the domain controllers: Access is denied. It is between two servers at a remote site. One is Windows 2003 and the other is Windows 2000; the Windows 2000 machines is experiencing the errors. The domain is older OUR_DOMAIN style. Attempts so far: I disabled Kerberos service on the Windows 2000 server and restarted RPC and RPC locater services have expected settings HKEY_Local_Machine\Software\Microsoft\Rpc\ClientProtocols missing ncacn_nb_tcp on Windows 20003 server (added) Portqry reports okay Firewall disabled netdom resetpwd (and reboot) on Windows 2000 server.

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