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• Apache CPU usage stays at 100% even when there are no requests

  - by Leirith

  Hi, I've been running the Apache HTTP server benchmarking tool (ab) on my new Apache server to test performance. I noticed that with a command like the following: ab -n 100000 -c 1000 http://www.mysite.com/ The CPU is used 100% by the apache2 processes during the testing. When the test concludes, usually with the following error just before the last requests are made: apr_poll: The timeout specified has expired (70007) Total of 99960 requests completed the CPU usage remains at 100%, and it's all being consumed by apache. I am using the worker MPM with and running PHP with mod_fcgid. Any advice as to why this is or what can be done to stop it would be appreciated.

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• Web application interacts bi-directional with server program?

  - by Roelof Berkepeis

  I want to write a web application to play chess against the engine Crafty. I'm not new to PHP and javascript, but must learn how to interact with a server process : how can a web application and/or (jQuery) ajax interact bi-directionally with a (linux) program running on the server? At this moment i am developing on (Apache) local host. Crafty is installed on my Ubuntu PC. This well-known chess engine has no GUI, it runs in terminal by the command $ /usr/games/crafty and so you can play chess against it and even see it's calculations. I can make Crafty run by PHP, using the functions proc_open() or exec(), and most documentation i found states that the output stream should be a file .. But i think i don't want such setup, because then the webpage should be constanty polling that file (eg. by ajax) to see if some new data was appended, right? How can Crafty talk to the web page directly, saying "i have calculated another variation" or "i have decided a move" etc, then display this info on the web page and let the user give some counter move, just like in terminal. Isn't it possible to use some session / stream / listener? I have no clue at all, can anybody point me in a right direction?

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• No monitor output after fresh install of 11.10 64-bit

  - by James

  I have a machine with a Nvidia 8600GT graphics card and a CRT monitor. Previously, I have only used Windows on it, and the graphics card seems to be working correctly in Windows 7. I booted up and installed Ubuntu 11.10 amd64 from the LiveCD and the whole process worked perfectly. When I tried to boot off the hard disk for the first time, the output to the monitor switched off during the splash screen, and this happens consistently. I can ctrl-alt-f2, so I tried an apt-get upgrade, which didn't help; nor did apt-get install nvidia-current. There is nothing that looks relevant in dmesg. Booting with the nomodeset option has no effect. Following the answers in this similar thread, I tried apt-get purge nvidia-173. Both startx and service lightdm start just say the service is already running. Does anyone know how to find out what the problem is? I was wondering if it is just that Ubuntu is trying to use a resolution that the monitor doesn't support, but I can't find out how to change that from the command line.

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• Can't pipe echo to netcat?

  - by user1641300

  I have the following command: echo 'HTTP/1.1 200 OK\r\n' | nc -l -p 8000 -c and when I curl localhost:8000 I am not seeing HTTP/1.1 200 .. being printed. I am on mac os x with netcat 0.7.1 Any ideas? #!/bin/bash trap 'my_exit; exit' SIGINT SIGQUIT my_exit() { echo "you hit Ctrl-C/Ctrl-\, now exiting.." # cleanup commands here if any } if test $# -eq 0 ; then echo "Usage: $0 PORT" echo "" exit 1 fi while true do echo "HTTP/1.1 200 OK\r\n" | nc -l -p ${1} -c done and testing with: curl localhost:8000

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• How to Integrate Dropbox with Pages, Keynote, and Numbers on iPad

  - by The Geek

  The iWork apps are some of the best apps on the iPad, and each show just how powerful a touchscreen device can be with the most basic of computing functions. In fact, there’s not much to dislike about the iWork apps, except for one thing: importing and exporting files. You can open documents from email attachments, download them from websites, or import them from other apps like Dropbox. Once you’ve opened your file in Pages, Keynote, or Numbers on iPad, though, you can only send it via email, upload it to a WebDAV server or Apple’s iDisk service, or wait to sync it with iTunes on your computer. Most other iOS office apps don’t offer nearly as many features as the iWork apps, but they do offer deep integration with Dropbox which makes it easy to view and edit your documents no matter where you are. Dropbox is the most popular file sync and sharing solution, and makes it absolutely painless to share folders with anyone around the world and keep your computers in sync. That is, computers and applications that integrate with Dropbox. However, you don’t need to give up on using Dropbox with iWork apps on iPad. Today we’re going to look at how you can enable WebDAV compatibility on your Dropbox account to let Pages integrate nearly the whole way with Dropbox. It’s not a perfect solution, but it’s much better than the default setup. So let’s get started Latest Features How-To Geek ETC How to Integrate Dropbox with Pages, Keynote, and Numbers on iPad RGB? CMYK? Alpha? What Are Image Channels and What Do They Mean? How to Recover that Photo, Picture or File You Deleted Accidentally How To Colorize Black and White Vintage Photographs in Photoshop How To Get SSH Command-Line Access to Windows 7 Using Cygwin The How-To Geek Video Guide to Using Windows 7 Speech Recognition Stylebot Customizes Web Pages in Chrome, Now Has Downloadable Styles Blackberry, Dell, Apple, and Motorola Tablets Compared [Infographic] Encrypt Your Google Search Queries Vintage Posters Showcase the History of Tech Advertising Google Cloud Print Extension Lets You Print Doc/PDF/Txt Files from Web Sites Hack a $10 Flashlight into an Ultra-bright Premium One

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• How To Use the Restore Partition to Break Into a Mac Running OS X Lion

  - by Justin Garrison

  It’s trivial to break into a Mac using an OS X boot disk, but new Macs use a restore partition for OS installations. Here’s how you can use that partition to reset a user password and break into a Mac. All laptops that come with OS X 10.7 “Lion” or laptops that were upgraded to Lion have a restore partition for easy OS recovery. This easy-to-use recovery partition also opens up hackers to break into your Mac without needing any additional tools. To reset a user password on a Mac with Lion you first need to restart the computer and hold the Command+R (?+R) keys. When the gray Apple logo shows up on the screen you can release the keys. Your computer should automatically boot into the recovery partition. Start by selecting your language and then go to Utilities -> Terminal in the menu. How to Sync Your Media Across Your Entire House with XBMC How to Own Your Own Website (Even If You Can’t Build One) Pt 2 How to Own Your Own Website (Even If You Can’t Build One) Pt 1

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• Corrupt mysql system tables

  - by psynnott

  I am having issues with the columns_priv table in the mysql system database. I cannot add new users currently. I have tried repairing it using mysqlcheck --auto-repair --all-databases --password but I get the following output: mysql.columns_priv Error : Incorrect file format 'columns_priv' error : Corrupt Is there any other way to repair this table, or how do I go about replacing it with a blank table? What would I lose by doing that? Thank you Edit (Additional Info) mysqld is currently using 100% cpu constantly. Looking at show processlist, I get: mysql> show processlist; +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | Id | User | Host | db | Command | Time | State | Info | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ | 5 | debian-sys-maint | localhost | mysql | Query | 1589 | Opening tables | ALTER TABLE tables_priv MODIFY Column_priv set('Select','Insert','Update','References') COLL | | | 752 | root | localhost | NULL | Query | 0 | NULL | show processlist | +-----+------------------+-----------+-------+---------+------+-------------------+------------------------------------------------------------------------------------------------------+ 2 rows in set (0.00 sec)

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• Configuring php with apache

  - by R11

  I managed to thoroughly confuse myself with php configuration in my apache install (on a mac). I am trying to get xdebug to work in eclipse and noticed that there are two different installs of php on my machine. The one (v5.4.5) in the apache install directory /opt/local/apache2/ and another one (v5.3) in the default system directory /usr/bin. My questions are: The php in the apache install directory was installed by me from source. But it does not have a php.ini file, instead it has PEAR.conf and other bunch of conf files. What are they and did I install something wrong? Can I compile apache with php support and have it use the php from the system directory right? How do I know which php its using? httpd -M is the only command i can see. Can I force apache to use a different php?

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• Entire filesystem restore from rdiff-backup snapshot

  - by atmosx

  I'm trying to make a complete system restore from an rdiff-backup. The cli for backing was: rdiff-backup --exclude-special-files --exclude /tmp --exclude /mnt --exclude /proc --exclude /sys / /mnt/backup/ebox/ I created a new partition mounted the partition at /mnt/gentoo and did: rdiff-backup -r /mnt/vol2 /mnt/gentoo However when I try to chroot to this system (following gentoo's manual, which means mounting /dev/ and /proc) I get the following error: chroot: failed to run command/bin/bash': No such file or directory` All this takes place on a Parallels (virtual machine) Debian installation. Any ideas on how to proceed in order to fully restore the system? Best Regards ps. /mnt/gentoo/bin/bash works fine if I execute it. All files and permissions are in place rdiff-backup seems to work just fine. However the system cannot neither boot (exits with kernel panic - cannot find init) or be chrooted.

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• Subversion: Avoid proxy use on intranet

  - by l0b0

  I'm trying to exclude all intranet hosts from proxy use, but it looks like http-proxy-exceptions just looks at the command line string, not what the host name in the string resolves to. Because of this, it looks like the only way to avoid proxy use on the IP 123.456.789.012*, which also answers to vcs, vcs.example.org, svn, svn.example.org, subversion and subversion.example.org is to list all of them, not just the IP. Is there some trick to make Subversion either resolve IP addresses before checking for proxy exceptions, or exclude everything that is not a fully qualified DNS name (that is, doesn't contain a dot)? * Yes, I know that's not a valid IP

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• Changing time or offsetting it in OpenVZ contained server

  - by Milad Naseri

  I am trying to run a VPS, a Debian box contained in an OpenVZ container. Obviously, I cannot use time --set or any such command, as the time must be set via the parent node. The owner of the parent node, however refuses to adjust the time (which is 30 minutes slower than the actual time). All the programs on my system, consequently, now recognized the false time and this throws a wrench in my syncing. Is there a way to possibly change the system time without interference from the container's administrator? Or perhaps, failing that, a way to make the programs "see" the time 30 minutes faster than what is reported by the container?

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• How to make Windows display application crashes in the console?

  - by Name is carl

  I'm developping a C application on Windows 7 64 bits, and each time it crashes I get the following dialog: I would prefer something more "old school" with the complete error dumped in the console. Something like > HelloWorld The application has crashed in somedll.dll for some Horrible C reason. I have an error code 0x4445506 And a kinda stacktrace And walls of hexa 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 0x4445506 Is there a way to get that? Should I run my application with a command line debugger ? Note: should I post this on Stackoverflow instead?

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• Downloading file from FTP using cURL

  - by Josiah

  I'm trying to use a cURL command to download a file from an FTP server to a local drive on my computer. I've tried curl "ftp://myftpsite" --user name:password -Q "CWD /users/myfolder/" -O "myfile.raw" But it returns an error that says: curl: Remote file name has no length! curl: try 'curl --help' or 'curl --manual' for more information curl: (6) Could not resolve host: myfile.raw; No data record of requested type I've tried some other methods, but nothing seems to work. Also, I'm not quite sure how to specify which folder I want the file to be downloaded to. How would I do that?

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• Distributing my Application inside a Debian Virtual Machine Image-- How to meet GPL obligations?

  - by bdk

  I have a Linux application I've developed, and I have created a standalone VMWare Image that people can download to try out the application without needing to install and configure a Linux Server. I created this VMWare Image by starting with a base Debian system, installing a bunch of packages and then configuring all the packages and daemons my application depends on. Upon load, the VMWare Image boots right into an X Server running only my application and no Window manager, so its more of a "Virtual Appliance" than a normal Linux Desktop environment. Users generally will never see a command prompt or any application other than my own. (My application itself I have a handle on the licensing issues of) Now I would like to distribute this image, but I'm not sure how to meet my GPL (and other licenses the various Debian components are released under) Obligations. As I understand it, I have two primary obligations to meet. Providing Copyright and License Information for each component I use. As I understand it, all the information I am required to present is located in the /usr/share directory in the Debian, but since my users generally will never touch a console or terminal, they will never see this. Does providing a text file containing a concatenation of all the files inside /usr/share meet this obligation Making source code available for all components I distribute. Since I am not creating the image from source, but from binary packages, I can't provide the actual source code that results in exactly my image being generated. Does providing an ftp mirror and an offer to send that mirror on DVDs of the Debian source debs for all the packages I use meet this obligation? Anything Else I'm required to do to legally distribute this image?

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• Can gedit on mac be used to edit files over ssh?

  - by Dave

  I use a linux machine at work and a mac at home. I can ssh from my machine at home to my work machine. But the only editor that I have access to on the command line then is vi, which I don't like. Is there a way to use gedit on my mac to edit files remotely over an ssh connection? This page says that it can be done, but I think that it assumes that you are using gedit on ubuntu. On my mac (os 10.5.8) I don't have the "bookmark" option when I click "connect to server". http://thecodecentral.com/2010/04/02/use-gedit-as-remote-file-editor-via-ftp-and-ssh-ubuntu/comment-page-1#comment-50558

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• Tar dereference only 1 level

  - by Bart van Heukelom

  I use the following pseudo-script to create a TAR of my installed software mkdir tmp ln -s /path/to/app1/bin tmp/app1 ln -s /and/path/going/to/the-app-2 tmp/app2 tar -c --dereference -f apps.tar tmp I need the --dereference option here to follow the links I just made in tmp. The reason I make the links in the first place is to store the directories with a different name in the archive than they have on the filesystem. Until now it has worked fine. However, I now have the situation that /path/to/app1 also contains links, and those I don't want to follow. Is this possible with some changes to the tar command? Or do I need to completely switch around the way I build the archive?

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• dvcs - is "clone to branch" a common workflow?

  - by Tesserex

  I was recently discussing dvcs with a coworker, because our office is beginning to consider switching from TFS (we're a MS shop). In the process, I got very confused because he said that although he uses Mercurial, he hadn't heard of a "branch" or "checkout" command, and these terms were unfamiliar to him. After wondering how it was possible that he didn't know about them and explaining how dvcs branches work "in place" on your local files, he was quite confused. He explained that, similar to how TFS works, when he wants to create a "branch" he does it by cloning, so he has an entire copy of his repo. This seemed really strange to me, but the benefit, which I have to concede, is that you can look at or work on two branches simultaneously because the files are separate. In searching this site to see if this has been asked before I saw a comment that many online resources promote this "clone to branch" methodology, to the poster's dismay. Is this actually common in the dvcs community? And what are some of the pros and cons of going this way? I would never do it since I have no need to see multiple branches at once, switching is fast, and I don't need all the clones filling up my disk.

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• Ubuntu 13.10 Unity doesn't load after upgrade

  - by William

  Just upgraded to Ubuntu 13.10 only to find that Unity won't load (login freezes, after doing ctrl+alt+F1, logging in and then doing startx, I get a blank desktop and the mouse pointer, and nothing else). I can right click, but the only operations that work are "create new file" and "create new folder". For example, "change desktop background" doesn't work. Also, after doing a few right clicks and choosing "change desktop background", I get a warning message box: "compiz closed unexpectedly." Guest login works fine. Tried creating a new user, but I experience the same thing with the new user. Tried removing all configuration files from my home directory... same thing. Doing dconf reset -f /org/compiz/ gives an error "error spawning command line..." Doing unity --reset also gives errors. Tried uninstalling unity (and compiz) and reinstalling, but that doesn't help. Tried reconfiguring lightdm, didn't help. I don't have any proprietary drivers installed. Once again, the funny thing is that the guest session works fine.

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• recommendations for a lightweight linux distribution for a test server

  - by Jack

  I'm planning on setting up a test server to experiment with some application servers (tomcat/jboss/...) and with some portals. Now the machine I've set aside for this is lightweight CPU/GPU wise(Atom D510, 4 gigabyte ram, 500 GiB hdd, onboard GPU). But it should suffice for most things, I'm more interested in the stability of JBoss/Tomcat for my purposes than the stability. However I'm having a bit of trouble picking an appropriate distribution size/performance/setup time wise/security wise since it seems I can't sneeze without another distribution popping up. I've been thinking about going for Fedora since I've read that that distribution has been optimized for Atom, but I'm not really familiar with it. My experience with Linux has mostly been limited to Ubuntu and some tinkering with puppylinux. I'm not afraid to get my hands dirty using the command line. I'm not planning on starting a discussion per se, mostly the pros/cons that people have encountered with some distributions

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• Upgraded to Ubuntu 12.04 from 10.04 and have to transfer database from Postgresql 8.4 to 9.1

  - by Stpn

  I upgraded server with a Rails application to Ubuntu 12.04 from 10.04 and cannot connect to Postgresql database now... Here is the error message from Rails app: could not connect to server: No such file or directory Is the server running locally and accepting connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432" Also the pg_ctl start is not recognized as a command.. EDIT: Turns out my database in on Postgresl 8.4 and my sever is now running on 9.1. So all the database files / configs are on 8.4.. How can I transfer them? Just straight copy from old pg_hba.conf?

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• "Cannot allocate memory" while no process seems to be using up memory

  - by omat

  I am not competent on server issues, any help is much appreciated. When try to start a python/django shell on a linux box, I am getting OSError: [Errno 12] Cannot allocate memory. free -m seems to confirm I am out of memory: total used free shared buffers cached Mem: 590 560 29 0 3 37 -/+ buffers/cache: 518 71 Swap: 0 0 0 But I cannot see what is eating up the memory with top or ps aux: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1 root 20 0 24336 908 0 S 0.0 0.2 0:00.68 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 3 root 20 0 0 0 0 S 0.0 0.0 0:04.85 ksoftirqd/0 How can I identify the leak? Thanks. BTW, I am not sure if it is relevant, but the machine I am talking about is an AWS EC2 instance with Ubuntu 12 running.

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• Mysql migrate huge db from innodb to ndbcluster Err: the table is full

  - by Nguyen Trong Nhan

  I'm trying to migrate old database to mysql cluster (4 data nodes) by using command: ALTER TABLE sample ENGINE=NDBCLUSTER but I'm getting the following error: The table '#sql-7ff3_3' is full There are approximately 300 mil rows in this table. Here are my config file: /mysql-cluster/config.ini [NDBD DEFAULT] NoOfReplicas=2 DataDir=/data/mysql-cluster/ndb/ BackupDataDir=/data/mysql-cluster/backup/ DataMemory=10G IndexMemory=5G TimeBetweenLocalCheckpoints=6 FragmentLogFileSize=256MB NoOfFragmentLogFiles=50 MaxNoOfOrderedIndexes=8000 MaxNoOfConcurrentOperations=100000 MaxNoOfTables = 10000 RedoBuffer=128M MaxNoOfAttributes=5000 MaxNoOfUniqueHashIndexes=1024 /etc/my.cnf [mysqld] basedir=/usr/local/mysql datadir=/data/mysql-cluster/mysqld/ event_scheduler=on default-storage-engine=ndbcluster ndbcluster ndb-connectstring=192.168.x.x,192.168.x.x innodb_file_per_table innodb_buffer_pool_size = 512MB key_buffer = 512M key_buffer_size = 512M sort_buffer_size = 512M table_cache = 1024 read_buffer_size = 512M

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• decent use-case for goto in c?

  - by Robz

  I really hesitate to ask this, because I don't want to "solicit debate, arguments, polling, or extended discussion" but I'm new to C and want to gain more insight into common patterns used in the language. I recently heard some distaste for the goto command, but I've also recently found a decent use-case for it. Code like this: error = function_that_could_fail_1(); if (!error) { error = function_that_could_fail_2(); if (!error) { error = function_that_could_fail_3(); ...to the n-th tab level! } else { // deal with error, clean up, and return error code } } else { // deal with error, clean up, and return error code } If the clean-up part is all very similar, could be written a little prettier (my opinion?) like this: error = function_that_could_fail_1(); if(error) { goto cleanup; } error = function_that_could_fail_2(); if(error) { goto cleanup; } error = function_that_could_fail_3(); if(error) { goto cleanup; } ... cleanup: // deal with error if it exists, clean up // return error code Is this a common or acceptable use-case of goto in C? Is there a different/better way to do this?

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• Disable passwd history feature with remember=0

  - by user1915177

  PAM version - pam-0.79 Is setting 0 allowed on "remember" option in /etc/pam.d/common-passwd file of pam.d module to disable passwd history feature? With "remember=0" in /etc/pam.d/common-passwd file, I am observing a memfault when running the passwd command as a USER. When browsed the source, the function in _set_ctrl in support.c file of pam_unix module handles wrong values of remember, but currently its not robust enough to handle 0, which is a wrong value. So the valid and only option to disable history feature, is to not include the "remember" option in /etc/pam.d/common-passwd file and not to set-up /etc/security/opasswd file? Could see in the following link mention of setting "remember" to 0 has no effect to remember value in "/etc/security/opasswd" file. =https://lists.fedorahosted.org/pipermail/linux-pam-commits/2011-June/000060.html

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• How to run programs from a different directory in unix

  - by user1067358

  I know this is a very simple question, and that many similar (but more complicated!) questions have been asked- So i wanted to ask this in a very plane manner. Sorry if this voids the rules of conduct on this website! I'm very new to using unix. I have a program that converts a ".evt" file to an .rq1, which is used for data analysis. The command to do so is simple, for example: Convert data.evt (this outputs data.rq1). This program, let's say, is located in directory /A and I have a data file that I want to convert in directory /B. How would I go about executing this program without moving the convert program to directory B?

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