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• WebMotion, le nouveau framework web libre en Java fondé sur le principe du « Keep It Simple and Stupid »

  WebMotion, le nouveau framework web libre en Java Fondé sur le principe « KISS » du « Keep It Simple, Stupid » WebMotion est un framework de développement d'application web qui repose sur une architecture REST et sur le standard Java EE 6. Ce framework propose 2 fonctionnalités principales: La première est d'assurer la couche présentation par le biais de pages (JSP, HTML, etc.). La seconde est d'exposer ...

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• High system cpu load (%sys), system locks

  - by Mark

  For the last two weeks we are having intermittent severe spikes in system cpu usage (shown as %sys), which last for maybe half a minute, locking most processes, including ssh. I've been trying to figure this out, but atop doesn't show anything relevant (system usage for processes it shows is insignificant), spikes are intermittent and I could not reproduce the spike using any workload for the web application this webserver hosts. If you have any ideas on how to debug high %sys and (sometimes) %si CPU usage, please share them. System specs (don't know if any of this is relevant): Dedicated server, CentOS 6, core i7 950, consistent 4 to 8 GB RAM free at any time, hard drives are in RAID-1. Additional info: dmesg output doesn't change between spikes /var/log/messages doesn't change between spikes Here is cat /proc/vmstat Here is output of mpstat 1 during a typical spike Add 07.11.11: looks like simple reboot restored system state, and we might never know what caused the disturbance in first place.

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• Text after Control Sequence

  - by SPAM SPAM SPAM SPAM

  I am trying to parse the output of a command that expects to be writing to the screen. It has data separated by move-to-origin control sequences (for the VT220, ESC[1;1H). I only need the last part (i.e. after the last move-to-origin). I have tried doing this multiple ways (primarily awk and sed), but the problem is always that parts of the control sequence have special meaning (to the program, not just to the shell), and I cannot quote them when I substitute tput's output. Any suggestions?

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• How to pronounce "std" as in "std::vector"

  - by Lex Fridman

  In C++, the STL (standard template library) includes a namespace std that contains the many data structures and algorithms that we all know and love. I've always pronounced this namespace just like sexually transmitted diseases: S T D. But then I listened to this excellent series of lectures by Stephan T. Lavavej and he pronounces it "stood". Which is the "correct" pronunciation or at least what is that most commonly used one?

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• How can I get rid of the motd message "*** /dev/sdb1 will be checked for errors at next reboot ***"? [duplicate]

  - by kmm

  This question already has an answer here: Persistent “disk will be checked…” in the message of the day (motd) even after reboot 3 answers My motd persistently has: *** /dev/sdb1 will be checked for errors at next reboot *** The problem is that I don't have /dev/sdb1 on my system. I only have /dev/sdb2 (mouted as /) and /dev/sda1 which mounts to /media/backup. I delete that line from /etc/motd, but it reappears after reboot. Here's my df output: Filesystem Size Used Avail Use% Mounted on /dev/sdb2 73G 3.7G 66G 6% / udev 490M 4.0K 490M 1% /dev tmpfs 200M 760K 199M 1% /run none 5.0M 0 5.0M 0% /run/lock none 498M 0 498M 0% /run/shm /dev/sda1 1.9T 429G 1.4T 25% /media/backup Update Here is the output of sudo fdisk -l Disk /dev/sda: 2000.4 GB, 2000398934016 bytes 255 heads, 63 sectors/track, 243201 cylinders, total 3907029168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x0003dfc2 Device Boot Start End Blocks Id System /dev/sda1 63 3907024064 1953512001 83 Linux Disk /dev/sdb: 80.0 GB, 80026361856 bytes 255 heads, 63 sectors/track, 9729 cylinders, total 156301488 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00049068 Device Boot Start End Blocks Id System /dev/sdb1 152301568 156301311 1999872 82 Linux swap / Solaris /dev/sdb2 * 2048 152301567 76149760 83 Linux Partition table entries are not in disk order I guess /dev/sdb1 is my swap space.

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• How do I get 12.04 to recognize swap partition so that I can hibernate?

  - by Kayla

  I justed installed 12.04 and used gparted to erase and enlarge my swap partition. When I rebooted, gparted said that the file partition for the swap was unknown. Gparted doesn't let me change the file partition to "linux-swap". It does let me change it to NTFS, but when I reboot, it goes back to "unknown". Thanks in advance for your help. Output from sudo swapon -s: Filename Type Size Used Priority /dev/mapper/cryptswap1 partition 9025532 0 -1 Output from sudo fdisk -l: Disk /dev/sda: 250.1 GB, 250059350016 bytes 255 heads, 63 sectors/track, 30401 cylinders, total 488397168 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x9d63ac84 Device Boot Start End Blocks Id System /dev/sda1 * 2048 2459647 1228800 7 HPFS/NTFS/exFAT /dev/sda2 2459648 197836472 97688412+ 7 HPFS/NTFS/exFAT /dev/sda3 466890752 488395119 10752184 7 HPFS/NTFS/exFAT /dev/sda4 197836798 466890751 134526977 5 Extended /dev/sda5 197836800 448837631 125500416 83 Linux /dev/sda6 448839680 466890751 9025536 82 Linux swap / Solaris Partition table entries are not in disk order Disk /dev/mapper/cryptswap1: 9242 MB, 9242148864 bytes 255 heads, 63 sectors/track, 1123 cylinders, total 18051072 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x951b7f53 Disk /dev/mapper/cryptswap1 doesn't contain a valid partition table

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• Path is present, Permissions are okay, but still getting error

  - by N e w B e e

  I recently installed pdftk using instruction provided at stack overflow I installed it, and run the commanded whereis pdftk the result was /usr/local/bin/pdftk /usr/bin/pdftk I have the powerpannel access and I saw it through it that pdftk actually exists at the location i run the command pdftk --version, it was okay but when in php i use <?php $command = "pdftk --help"; system("PATH=/usr/local/bin/ && $command",$response); if ($response===FALSE){ echo 'sorry error occured'; } else{ echo $response; } ?> the output is 127 the version i am using is 1.41 and the output '127' is something that i cant understand can somebody guide me?

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• Asterisk server firewall script allows 2-way audio from incoming calls, but not on outgoing?

  - by cappie

  I'm running an Asterisk PBX on a virtual machine directly connected to the Internet and I really want to prevent script kiddies, l33t h4x0rz and actual hackers access to my server. The basic way I protect my calling-bill now is by using 32 character passwords, but I would much rather have a way to protect The firewall script I'm currently using is stated below, however, without the established connection firewall rule (mentioned rule #1), I cannot receive incoming audio from the target during outgoing calls: #!/bin/bash # first, clean up! iptables -F iptables -X iptables -t nat -F iptables -t nat -X iptables -t mangle -F iptables -t mangle -X iptables -P INPUT ACCEPT iptables -P FORWARD DROP # we're not a router iptables -P OUTPUT ACCEPT # don't allow invalid connections iptables -A INPUT -m state --state INVALID -j DROP # always allow connections that are already set up (MENTIONED RULE #1) iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT # always accept ICMP iptables -A INPUT -p icmp -j ACCEPT # always accept traffic on these ports #iptables -A INPUT -p tcp --dport 80 -j ACCEPT iptables -A INPUT -p tcp --dport 22 -j ACCEPT # always allow DNS traffic iptables -A INPUT -p udp --sport 53 -j ACCEPT iptables -A OUTPUT -p udp --dport 53 -j ACCEPT # allow return traffic to the PBX iptables -A INPUT -p udp -m udp --dport 50000:65536 -j ACCEPT iptables -A INPUT -p udp -m udp --dport 10000:20000 -j ACCEPT iptables -A INPUT -p udp --destination-port 5060:5061 -j ACCEPT iptables -A INPUT -p tcp --destination-port 5060:5061 -j ACCEPT iptables -A INPUT -m multiport -p udp --dports 10000:20000 iptables -A INPUT -m multiport -p tcp --dports 10000:20000 # IP addresses of the office iptables -A INPUT -s 95.XXX.XXX.XXX/32 -j ACCEPT # accept everything from the trunk IP's iptables -A INPUT -s 195.XXX.XXX.XXX/32 -j ACCEPT iptables -A INPUT -s 195.XXX.XXX.XXX/32 -j ACCEPT # accept everything on localhost iptables -A INPUT -i lo -j ACCEPT # accept all outgoing traffic iptables -A OUTPUT -j ACCEPT # DROP everything else #iptables -A INPUT -j DROP I would like to know what firewall rule I'm missing for this all to work.. There is so little documentation on which ports (incoming and outgoing) asterisk actually needs.. (return ports included). Are there any firewall/iptables specialists here that see major problems with this firewall script? It's so frustrating not being able to find a simple firewall solution that enabled me to have a PBX running somewhere on the Internet which is firewalled in such a way that it can ONLY allows connections from and to the office, the DNS servers and the trunk(s) (and only support SSH (port 22) and ICMP traffic for the outside world). Hopefully, using this question, we can solve this problem once and for all.

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• How iptables behaves on timezone change?

  - by pradipta

  I have doubt how iptables keep changing the info in iptables when timezone is change. I am using iptables s v 1.4.8 I have blocked one IP with following details # date Thu Jun 6 12:46:42 IST 2013 #iptables -A INPUT -s 10.0.3.128 -m time --datestart 2013-6-6T12:0:00 --datestop 2013-6-6T13:0:00 -j DROP # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 10.0.3.128 anywhere TIME starting from 2013-06-06 12:00:00 until date 2013-06-06 13:00:00 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination But after I change the timezone following things happened automatically . AFTER TIME ZONE CHANGE +++++++++++++++++++++++ #date Thu Jun 6 15:17:48 HKT 2013 # iptables -L Chain INPUT (policy ACCEPT) target prot opt source destination DROP all -- 10.0.3.128 anywhere TIME starting from 2013-06-06 14:30:00 until date 2013-06-06 15:30:00 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination # The time value is changed in the rule . It is changing with the timezone how. Where iptables keeps track of timezone. Kindly explain me.

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• OpenCL maintenant disponible en version 1.1 : rajoute, entre autre, une meilleure interopérabilité a

  Le Khronos Group a publié, hier, la première mise à jour de leurs spécifications concernant OpenCL. Après 18 mois, voici les principaux changements au menu : -une amélioration de la parallélisation; -un wrapper pour le C++; -certaines fonctionnalités optionnelles sont désormais standardisées; Plus d'informations sur : http://www.khronos.org/news/press/re...uting-standard Que pensez-vous de ces changements? De quelles manières l'utilisez-vous?...

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• Alternative to OpenBiblio

  - by Jose

  Is there any good open source alternative to OpenBiblio that can be ran on hosting package I have from undisclosed hosting company that does not give out root access to the server. I have seen that Koha and Evergreen needs root access and does not meet compatibility standard on my hosting package. Is there any good open source ones that can be ran with PHP and MySQL and community maintained and updated?

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• Excellent C Tutorials

  - by nebffa

  I've looked high and low for C tutorials that have lots of exercises to do along the way, but in my experience all the guides I've found have mostly explanation with a bit of code pre-written, lacking exercises for you to do. I started learning Python using Learn Python the Hard Way, and for almost all other standard languages there are good sites to learn and grapple with the syntax - for example codecademy.com, programr.com. Is there any site like any of the above for C?

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• A GFX card with two DVI and one HDMI with audio?

  - by TomaszRykala

  I haven't upgraded my PC for a while nor kept up to date with pc hardware since 2007, but have recently come up with a requirement and I am wondering if I can solve it! Are there any graphics cards out there that have two DVIs and one HDMI output, with the HDMI supporting sound over it? Basically, I've got a two PC monitor setup, and both monitors are connected to the two DVI's of my GTX9800+. I want to upgrade my card to say, GTX 460, but can't find if there is such with two DVIs (for my monitors) and one HDMI with audio (for my TV). So I am wondering, if such solution possible at all? I noticed that there are some cards out there with two DVI's and one mini-HDMI, but they all say 'HDMI Output Yes x 1 (via DVI to HDMI adaptor x 1 )', which probably means that because of the DVI element, the audio won't work. Is this true? Such card is an exmaple: http://uk.asus.com/Graphics_Cards/NVIDIA_Series/ENGTX460_DirectCU2DI1GD5/#specifications Many thanks for your help!

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• Load Test Manifesto

  - by jchang

  Load testing used to be a standard part of the software development, but not anymore. Now people express a preference for assessing performance on the production system. There is a lack of confidence that a load test reflects what will actually happen in production. In essence, it has become accepted that the value of load testing is not worth the cost and time, and perhaps whether there is any value at all. The main problem is the load test plan criteria – excessive focus on perceived importance...(read more)

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• What should I use for a package name if I don't have a domain? [closed]

  - by C. Ross

  Possible Duplicate: What is the point of Java’s package naming convention? What package name to choose for a small, open-source Java project? I write Java (and derivative languages with package names) for personal use, but I don't have a personal domain name, so the standard packaging naming convention doesn't hold. Since the same convention is used in Maven group-id's, the problem is the same there. What should I use for the root of my package name?

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• increment values in printf [migrated]

  - by ravi_arya

  #include <stdio.h> int main() { int i=1; printf("%d %d %d\n",i,++i,i++); i=1; printf("%d %d %d\n",++i,i,i++); i=1; printf("%d %d %d\n",i++,++i,i); i=1; printf("%d %d %d\n",i++,i,++i); i=1; printf("%d %d %d\n",++i,i++,i); i=1; printf("%d \n",(++i)*(++i)*(++i)); i=1; printf("%d %d %d\n",++i, ++i, ++i); return 0; } Output (GCC) 3 3 1 3 3 1 2 3 3 2 3 3 3 1 3 36 4 4 4 Output(Visual Studio) 3 3 1 3 3 1 2 3 3 2 3 3 3 1 3 64 4 4 4 Can any one explain this?

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• What is this thing called?!?! (bottom of screen popup)

  - by NRGdallas

  I am looking for the name and some possible jquery libraries etc for the standard bottom of screen popup bar. Its like a little bar that pops out on the bottom of the screen after X seconds or however really - generally slides up, about 50px or so high, and usually the length of the main container. used for some form of coupon advertisement or various promotion text etc. What is the proper term for this item, and would there be any good references to best-use guidelines?

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• A Business Website - Should Our Company Have One?

  A business website is the newly established standard for providing customers with timely information about product and services offered by a company. There are many important benefits that a company stands to gain by having a business website and they go far beyond the fact that customers today expect that a professionally run business should have a professional looking business website.

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• Set generic iptables rules?

  - by tftd

  This may be a really dumb question but how can you open a port on multiple interfaces without defining the interfaces? For example how do I open port 22 on all interfaces? On my machine I have some interfaces that are dynamic and may or may not be available so I have to set "generic" rules. This code is not working for me but I can't figure out why: # My default policy is to drop the input. # The other policies are required like that. $IPTABLES -P INPUT DROP $IPTABLES -P OUTPUT ACCEPT $IPTABLES -P FORWARD ACCEPT $IPTABLES -t nat -P POSTROUTING ACCEPT $IPTABLES -t nat -P PREROUTING ACCEPT $IPTABLES -t mangle -P OUTPUT ACCEPT $IPTABLES -t mangle -P PREROUTING ACCEPT #Open port 22 on all interfaces ? $IPTABLES -A INPUT -p tcp --dport 22 -j ACCEPT So apparently there's something wrong with the last line... but I can't see it?

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• Mysql loses its root password

  - by RubyDev

  I am having a strange problem, my mysql loses/resets the root password automatically. By which I mean that it resets it to none. It has happened twice this month. I am worried that it can be a security issue as data is open waiting only for someone trying no password! Here is the version: mysql --version mysql Ver 14.14 Distrib 5.1.56, for redhat-linux-gnu (i386) using readline 5.1 Any help would be appreciated. Update: Output of select user, host, password from mysql.user; how it looks after the password got reset | root | localhost | | root | 127.0.0.1 | | | localhost | | | admin | localhost | ################################# | (I have removed the actual output with #) So all the passwords are blank, except for for another user named 'admin'

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• Can I use stronger power supply to charge Kindle? [closed]

  - by Bobb

  I have power supply for Kindle with output 5V 0.85A. And I have Samsung Galaxy Pad one with output of 5V 2A. My guess is that a device will consume as much current as it can but no more than max power supply current. For example if Kindle device consumes 0.6A for charging its battery then it shouldnt create more than 0.6A current using Galaxy Pad power supply. So my guess - if I charge Kindle with Galaxy Pad power supply it wont burn out. Is that right?

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• Iptables and counters

  - by mehturt

  I'm trying to use iptables counters with munin to monitor traffic of hosts on my local subnet. For each host I set up a rule like this: iptables -I OUTPUT -d $ip This should count the packets going from firewall to $ip, correct? I found out that this does not seem to count all packets. I start tcpdump on my router (Linux) and I see packets to $ip that are not counted. For example I check number of packets for rule to my phone IP. I start tcpdump, refresh Gmail on my phoone, I see packets in tcpdump's output but iptables rule counters are not incremented. Then I open a web page on the same phone and the counters are incremented. What could be the reason?

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• Is there a canonical book on parallel programming with focus on C++ ?

  - by quant_dev

  I am looking for a good book about parallel programming with focus on C++. Something suitable for a person reasonably good in C++ programming, but with no experience in concurrent software development. On the other hand, I'd prefer a practical book, without loads of silly examples about philosophers eating lunch. Is there a book out there that's the de-facto standard for describing best practices, design methodologies, and other helpful information on parallel programming with focus on C++ ? What about that book makes it special?

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• Understanding RAM usage on Linux

  - by stebbo

  I'm completely new to Linux and I'm just trying to understand where all my RAM is going. I've got a pretty fresh install of Xubuntu running as a VMWare guest, and I've given it 1.5GB RAM to play with. After only running two apps starting up Tomcat servers and also running Firefox, I've got hardly anything left. 160MB according to free -m. Looking at the output from Top, I see Java appearing twice, each stealing about 1/2 Gig resident memory. Both Tomcat instances use the same jdk, I would have thought I'd only see Java there once. What's the story? I had a screenshot but unfortunately couldn't post it being under 10 rep. Update The free -m output requested: total used free shared buffers cached Mem: 1419 1380 39 0 8 111 -/+ buffers/cache: 1259 160 Swap: 509 68 441 Top (coming)

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• Using SQL Server Default Trace

  What is Default Trace? A default trace in SQL Server is a standard server side trace which is installed by default ... [Read Full Article]

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