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  • gcc: Do I need -D_REENTRANT with pthreads?

    - by stefanB
    On Linux (kernel 2.6.5) our build system calls gcc with -D_REENTRANT. Is this still required when using pthreads? How is it related to gcc -pthread option? I understand that I should use -pthread with pthreads, do I still need -D_REENTRANT? On a side note, is there any difference that you know off between the usage of REENTRANT between gcc 3.3.3 and gcc 4.x.x ? When I use -pthread gcc option I can see that _REENTRANT gets defined. Will omitting -D_REENTRANT from command line make any difference, for example could some objects be compiled without multithreaded support and then linked into binary that uses pthreads and will cause problems? I assume it should be ok just to use: g++ -pthread > echo | g++ -E -dM -c - > singlethreaded > echo | g++ -pthread -E -dM -c - > multithreaded > diff singlethreaded multithreaded 39a40 > #define _REENTRANT 1 We're compiling multiple static libraries and applications that link with the static libraries, both libraries and application use pthreads. I believe it was required at some stage in the past but want to know if it is still required. Googling hasn't returned any recent information mentioning -D_REENTRANT with pthreads. Could you point me to links or references discussing the use in recent version of kernel/gcc/pthread? Clarification: At the moment we're using -D_REENTRANT and -lpthread, I assume I can replace them with just g++ -pthread, looking at man gcc it sets the flags for both preprocessor and linker. Any thoughts?

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  • Linux, some packets are not being NAT

    - by user70932
    Hi, I'm trying to NAT HTTP traffic, I'm new to this and facing some issues. What i'm trying to do is NAT client HTTP requests to a webserver. CLIENT - NAT BOX - WEBSERVER When the client open the IP of the NAT BOX, the request should be pass to the web server. But I'm getting "HTTP request sent, awaiting response..." and then wait serveral minutes before the request is done. Looking at the tcpdump output, it looks like the first Syn packet on (10:48:54) is being NAT but not the second, third, fourth... ACK or PSH packets, and wait until (10:52:04) it starts NAT again on the ACK packet. The iptables command I'm using is: iptables -t nat -A PREROUTING -p tcp -i eth0 --dport 80 \ -j DNAT --to-destination WEBSERVER I'm wondering what could have caused this behavior? Thanks alot. 10:48:54.907861 IP (tos 0x0, ttl 49, id 16395, offset 0, flags [DF], proto: TCP (6), length: 48) CLIENT.61736 > NATBOX.http: S, cksum 0x6019 (correct), 1589600740:1589600740(0) win 5840 <mss 1460,nop,wscale 8> 10:48:54.907874 IP (tos 0x0, ttl 48, id 16395, offset 0, flags [DF], proto: TCP (6), length: 48) CLIENT.61736 > WEBSERVER.http: S, cksum 0xb5d7 (correct), 1589600740:1589600740(0) win 5840 <mss 1460,nop,wscale 8> 10:48:55.102696 IP (tos 0x0, ttl 49, id 16397, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x2727 (correct), ack 2950613896 win 23 10:48:55.102963 IP (tos 0x0, ttl 49, id 16399, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > NATBOX.http: P 0:120(120) ack 1 win 23 10:48:58.103078 IP (tos 0x0, ttl 49, id 16401, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > NATBOX.http: P 0:120(120) ack 1 win 23 10:48:58.366344 IP (tos 0x0, ttl 49, id 16403, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x26af (correct), ack 1 win 23 10:49:04.103204 IP (tos 0x0, ttl 49, id 16405, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > NATBOX.http: P 0:120(120) ack 1 win 23 10:49:04.363943 IP (tos 0x0, ttl 49, id 16407, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x26af (correct), ack 1 win 23 10:49:16.101583 IP (tos 0x0, ttl 49, id 16409, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > NATBOX.http: P 0:120(120) ack 1 win 23 10:49:16.363475 IP (tos 0x0, ttl 49, id 16411, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x26af (correct), ack 1 win 23 10:49:40.100796 IP (tos 0x0, ttl 49, id 16413, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > NATBOX.http: P 0:120(120) ack 1 win 23 10:49:40.563898 IP (tos 0x0, ttl 49, id 16415, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x26af (correct), ack 1 win 23 10:50:28.099396 IP (tos 0x0, ttl 49, id 16417, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > NATBOX.http: P 0:120(120) ack 1 win 23 10:50:28.761678 IP (tos 0x0, ttl 49, id 16419, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x26af (correct), ack 1 win 23 10:52:04.093668 IP (tos 0x0, ttl 49, id 16421, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > NATBOX.http: P 0:120(120) ack 1 win 23 10:52:04.093678 IP (tos 0x0, ttl 48, id 16421, offset 0, flags [DF], proto: TCP (6), length: 160) CLIENT.61736 > WEBSERVER.http: P 1589600741:1589600861(120) ack 2950613896 win 23 10:52:04.291021 IP (tos 0x0, ttl 49, id 16423, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x25d3 (correct), ack 217 win 27 10:52:04.291028 IP (tos 0x0, ttl 48, id 16423, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > WEBSERVER.http: ., cksum 0x7b91 (correct), ack 217 win 27 10:52:04.300708 IP (tos 0x0, ttl 49, id 16425, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x253c (correct), ack 368 win 27 10:52:04.300714 IP (tos 0x0, ttl 48, id 16425, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > WEBSERVER.http: ., cksum 0x7afa (correct), ack 368 win 27 10:52:04.301417 IP (tos 0x0, ttl 49, id 16427, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: F, cksum 0x253b (correct), 120:120(0) ack 368 win 27 10:52:04.301438 IP (tos 0x0, ttl 48, id 16427, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > WEBSERVER.http: F, cksum 0x7af9 (correct), 120:120(0) ack 368 win 27 10:52:04.498875 IP (tos 0x0, ttl 49, id 16429, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > NATBOX.http: ., cksum 0x253a (correct), ack 369 win 27 10:52:04.498881 IP (tos 0x0, ttl 48, id 16429, offset 0, flags [DF], proto: TCP (6), length: 40) CLIENT.61736 > WEBSERVER.http: ., cksum 0x7af8 (correct), ack 369 win 27

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  • setting up a shared folder in linux

    - by Chris
    I'm trying to set up a folder in my home directory that will be shared with another user but for some reason it is not working this is what I've done, I have tried two different ways using ACL's and chown/chgrp etc I set up a group called say: sharedgroup and added both my user (john) and fred to it so when I run groups john john wheel sharedgroup groups fred sharedgroup fred mkdir /home/john/shared vim /home/john/shared/hello.txt (typed in some text saved it) chown -R :sharedgroup shared chmod -R o=-rwx shared ll drwxrwx--- 2 john sharedgroup 4096 Sep 9 21:14 shared ll shared -rw-rw-r-- 1 john sharedgroup 7 Sep 9 21:14 hello.txt (I also tried adding in the s permissions but that didn't help either) then when I log out of the server and log back in as fred and try these commands they fail vim /home/john/shared/hello.txt (won't allow me to write opens a blank file) cd /home/john/shared -bash: cd: /home/john/cis: Permission Denied ls /home/john/shared -ls: /home/john/shared: Permission Denied ls -lad /home/john/shared -ls: /home/john/shared: Permission Denied id fred uid=500(fred) gid=502(sharedgroup) groups=502(sharedgroup),500(fred) context=user_u:system_r:unconfined_t Any idea what I'm doing wrong??

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  • Linux accessibility: Slow Keys causing duplicate key strokes

    - by skypanther
    I'm exploring the accessibility features within Gnome and having trouble with Slow Keys. My input is always doubled. Press a key briefly and I get nothing as you'd expect. Press just a bit longer and which ever key I'm pressing is input twice. Hello becomes HHeelllloo. I'm running Debian Lenny 5.0.6, kernel 2.6.26-2-686, GNOME Desktop 2.22.3 running within a VirtualBox session. I did some googling and didn't find others having similar troubles. Maybe it's a vbox thing? Any ideas how to fix this so I don't get the duplicates? It makes it impossible to log back in when the screen lock kicks on!

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  • Error Installing ruby with RVM Single User mode on Arch Linux

    - by ChrisBurnor
    I've just installed RVM on ArchLinux x64 in single user mode via the recommended install script curl -L https://get.rvm.io | bash -s stable I've also installed all the requirements listed in rvm requirements However, I'm having trouble actually installing any version of ruby. And getting the following error: arch:~ % rvm install 1.9.3 No binary rubies available for: ///ruby-1.9.3-p194. Continuing with compilation. Please read 'rvm mount' to get more information on binary rubies. Fetching yaml-0.1.4.tar.gz to /home/christopher/.rvm/archives % Total % Received % Xferd Average Speed Time Time Time Current Dload Upload Total Spent Left Speed 100 460k 100 460k 0 0 702k 0 --:--:-- --:--:-- --:--:-- 767k Extracting yaml-0.1.4.tar.gz to /home/christopher/.rvm/src Prepare yaml in /home/christopher/.rvm/src/yaml-0.1.4. Configuring yaml in /home/christopher/.rvm/src/yaml-0.1.4. Error running ' ./configure --prefix=/home/christopher/.rvm/usr ', please read /home/christopher/.rvm/log/ruby-1.9.3-p194/yaml/configure.log Compiling yaml in /home/christopher/.rvm/src/yaml-0.1.4. Error running 'make', please read /home/christopher/.rvm/log/ruby-1.9.3-p194/yaml/make.log Please note that it's required to reinstall all rubies: rvm reinstall all --force Installing Ruby from source to: /home/christopher/.rvm/rubies/ruby-1.9.3-p194, this may take a while depending on your cpu(s)... ruby-1.9.3-p194 - #downloading ruby-1.9.3-p194, this may take a while depending on your connection... ruby-1.9.3-p194 - #extracting ruby-1.9.3-p194 to /home/christopher/.rvm/src/ruby-1.9.3-p194 ruby-1.9.3-p194 - #extracted to /home/christopher/.rvm/src/ruby-1.9.3-p194 Skipping configure step, 'configure' does not exist, did autoreconf not run successfully? ruby-1.9.3-p194 - #compiling Error running 'make', please read /home/christopher/.rvm/log/ruby-1.9.3-p194/make.log There has been an error while running make. Halting the installation. The log files are as follows: arch:~ % cat ~/.rvm/log/ruby-1.9.3-p194/yaml/configure.log __rvm_log_command:32: permission denied: arch:~ % cat ~/.rvm/log/ruby-1.9.3-p194/yaml/make.log make: *** No targets specified and no makefile found. Stop. arch:~ % cat ~/.rvm/log/ruby-1.9.3-p194/make.log make: *** No targets specified and no makefile found. Stop.

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  • Auto Start of Proftpd on OpenSuse Linux

    - by a_ak
    I´m trying to activate the Ftpservice on my Root Server, i have OpenSuse installed, and I´m using the xinetd method .. i added this to my xineted.conf: service ftp { flags = REUSE socket_type = stream protocol = tcp wait = no user = root server = /usr/sbin/in.proftpd disable = no } I´m not sure about this "server = /usr/sbin/in.proftpd" .. i added the code directly in the xinetd.config and not in a seperate file.. and to my proftpd.conf as the documentation of profdtp ( was already setted) : ServerType inetd Then I restarted the xineted service .. and no errors to see, but the proftpd ist still not statrting/launching .. I searched alot on google, but everywhere they say to do what i did abouve, nothing more.. did i miss something ?

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  • Cannot push to GitHub from Amazon EC2 Linux instance

    - by Eli
    Having the worst luck push files to a repo from EC2 to GitHub. I have my ssh key setup and added to Github. Here are the results of ssh -v [email protected] OpenSSH_5.3p1, OpenSSL 1.0.0g-fips 18 Jan 2012 debug1: Reading configuration data /etc/ssh/ssh_config debug1: Applying options for * debug1: Connecting to github.com [207.97.227.239] port 22. debug1: Connection established. debug1: permanently_set_uid: 0/0 debug1: identity file /root/.ssh/identity type -1 debug1: identity file /root/.ssh/id_rsa type 1 debug1: identity file /root/.ssh/id_dsa type -1 debug1: Remote protocol version 2.0, remote software version OpenSSH_5.1p1 Debian-5github2 debug1: match: OpenSSH_5.1p1 Debian-5github2 pat OpenSSH* debug1: Enabling compatibility mode for protocol 2.0 debug1: Local version string SSH-2.0-OpenSSH_5.3 debug1: SSH2_MSG_KEXINIT sent debug1: SSH2_MSG_KEXINIT received debug1: kex: server->client aes128-ctr hmac-md5 none debug1: kex: client->server aes128-ctr hmac-md5 none debug1: SSH2_MSG_KEX_DH_GEX_REQUEST(1024<1024<8192) sent debug1: expecting SSH2_MSG_KEX_DH_GEX_GROUP debug1: SSH2_MSG_KEX_DH_GEX_INIT sent debug1: expecting SSH2_MSG_KEX_DH_GEX_REPLY debug1: Host 'github.com' is known and matches the RSA host key. debug1: Found key in /root/.ssh/known_hosts:1 debug1: ssh_rsa_verify: signature correct debug1: SSH2_MSG_NEWKEYS sent debug1: expecting SSH2_MSG_NEWKEYS debug1: SSH2_MSG_NEWKEYS received debug1: SSH2_MSG_SERVICE_REQUEST sent debug1: SSH2_MSG_SERVICE_ACCEPT received debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Trying private key: /root/.ssh/identity debug1: Offering public key: /root/.ssh/id_rsa debug1: Remote: Forced command: gerve eliperelman 81:5f:8a:b2:42:6d:4e:8c:2d:ba:9a:8a:2b:9e:1a:90 debug1: Remote: Port forwarding disabled. debug1: Remote: X11 forwarding disabled. debug1: Remote: Agent forwarding disabled. debug1: Remote: Pty allocation disabled. debug1: Server accepts key: pkalg ssh-rsa blen 277 debug1: Trying private key: /root/.ssh/id_dsa debug1: No more authentication methods to try. Permission denied (publickey).

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  • Netbook Wifi activation in OSX/Linux

    - by Klaus
    Hello, I bought a almost no-name netbook (chiligreen netbook neo), and I'm trying to have OSX86 working on it. No problem with the installation, but to activate wifi one must use Fn+F3. Of course it works with Windows, but neither in OSX or Ubuntu... Any idea ? A manual way to do something like http://greg.geekmind.org/eee-control/ ?

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  • PHP/Linux File Permissions

    - by user1733435
    May I ask a question about file permission. I set up Ubuntu server where Apache got running. I have simple php upload form and able to upload file to /var/www/site/uploads as follows. sandbox@sandbox-virtual-machine:/var/www/site/uploads$ ll total 1736 drwxrwxrwx 2 www-data www-data 4096 Oct 18 02:53 ./ drwxrwxrwx 3 sandbox sandbox 4096 Oct 18 00:42 ../ -rw-r--r-- 1 www-data www-data 145998 Oct 18 02:53 3d wallpaper pic.jpg -rw-r--r-- 1 www-data www-data 166947 Oct 18 02:53 3D Wallpapers 9.jpg -rw-r--r-- 1 www-data www-data 1451489 Oct 18 02:53 6453_3d_landscape_hd_wallpapers_green.jpg Is there anyway to upload files and they show up as -rw-r--r-- 1 sandbox sandbox 145998 Oct 18 02:53 3d wallpaper pic.jpg -rw-r--r-- 1 sandbox sandbox 166947 Oct 18 02:53 3D Wallpapers 9.jpg -rw-r--r-- 1 sandbox sandbox 1451489 Oct 18 02:53 6453_3d_landscape_hd_wallpapers_green.jpg so that I could straight away feed them to waiting/running shell script. Right now waiting script(move,checksums,rename,resize,etc) unable to do anything to uploaded files with attributes of www-data. If I just do as local account, such as sandbox@sandbox-virtual-machine:/var/www/site/uploads$touch testfile then the script is able to run as I would like to. Any suggestion would be grateful,thanks in advance as well. Thanks for everyone giving help to me,that I was able to progress. Now I am close to getting solved and append the output sandbox@sandbox-virtual-machine:/var/www/site/uploads$ ll total 388 drwxrwxrwx 2 www-data www-data 4096 Oct 18 04:22 ./ drwxrwxrwx 3 sandbox sandbox 4096 Oct 18 04:17 ../ -rw-r--r-- 1 sandbox sandbox 166947 Oct 18 04:21 3D Wallpapers 9.jpg -rw-r--r-- 1 sandbox sandbox 219808 Oct 18 04:20 adafruit_pi.png -rw-rw-r-- 1 sandbox sandbox 0 Oct 18 04:22 test How may I set permission to uploaded files like 'test' only w difference in middle group. Such as adafruit_pi.png Vs test. Which statement shall I insert to php code,please?

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  • Fastest light-weight image viewer over forwarded x11 session (linux)

    - by Matthew
    I have a slow network connection over which I'm forwarding x11 over ssh. I want to view images on the remote host (Ubuntu) quickly and efficiently. I'm looking for an image viewer that will take into account the image viewer window's resolution and downsize the image before sending it over the network, instead of sending the full size image. The images I want to view will be around 5MB and I only need to be able to browse through tiny thumbnails of the images to identify the image I'm looking for. It is not necessary to be able to see more than one image at a time. Highest speed over slow network connection is the priority. Thanks! Matthew EDIT: It's possible that the way x11 forwarding works, only the image at the display resolution will be transferred anyway. If that's true, please confirm and the question still stands for which image viewer will be the fastest over a slow connection

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  • Pure-FTPd linux upload problems - 500 Unknown command

    - by user1801273
    I'm running Centos with Kloxo CP and PureFTPd on VPS based on HyperVM. The problem - during the day, there are periods when FTP wors fine for hours, but sometimes it dies with "500 Unknown command" code. for files larger than 2Kb. This is really weird - with files less than 2472-2484 bytes everything would work fine, but with bigger files ftp would start writing file, would drop on 2Kb and would return "500 Unknown command" . This happens on Passive AND/OR Active connections for any filetypes. Logs are showing like the file was uploaded successfully , but the speed nearby the action would be 0.3 -0.5 Kb , when normal operation would report 70-150Kb/s speeds. I do have some Iptables firewalls on both HyperVM host,and VPS , however these are static, and most of the time it works just fine. Any suggestions on where to look for a solution would be appreciated :)

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  • Sync files between Mac, PC and Linux automatically

    - by Siriss
    Hello everyone- I have a MacBook Pro, a Windows 7 desktop, and a Fedora 13 netbook. I have been searching far and wide for an automatic solution to sync files (pictures, music, docs, etc...) between the three when they are all on the same LAN. To better explain, when I get home and turn my MacBook on, I want it to sync automatically any file changes to Windows 7 and the netbook. Likewise if I make changes on my Windows 7 box, I want them to be reflected on my Mac. I can use rsync, but it is not automatic as far as I can tell, and I would use Dropbox but I have a lot more that 2 gigs and do not want to pay. I also do not need internet syncing. I just want local LAN. Does anyone have any ideas? Thank you very much in advance.

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  • The laptop overheat when use linux ubuntu

    - by Rienna
    I use 2 operating system in my laptop. I am using windows 7 and ubuntu 12.04 When I use ubuntu, it's often make my laptop turned into overheat and sometimes turned off suddenly. Why it happen? Is it caused damage to my hardware or because I am using 2 OS? My laptop'specification Processor : Intel(R)Core(TM)2 Duo CPU T6600 @ 2.20Ghz 2.20 GHz RAM : 2 GB System type : 64-bit Operating System

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  • sound volume increase beyond 100% whenever possible on linux

    - by fakedrake
    Some audio output from files or streams is too low. It is obvious that hardware is able to play the same sounds but louder but because of the data it just plays it at some low level even at 100% volume. Vlc can generally increase the volume of a file up to 200%. Is there a way to do the same thing VLC does system-wide and if possible for an arbitrary v percentage value. If there is no application that does this, where should i look into for libs to do it myself or what code should i modify(eg code in the alsamixer) thank you

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  • Need help tuning Mysql and linux server

    - by Newtonx
    We have multi-user application (like MailChimp,Constant Contact) . Each of our customers has it's own contact's list (from 5 to 100.000 contacts). Everything is stored in one BIG database (currently 25G). Since we released our product we have the following data history. 5 years of data history : - users/customers (200+) - contacts (40 million records) - campaigns - campaign_deliveries (73.843.764 records) - campaign_queue ( 8 millions currently ) As we get more users and table records increase our system/web app is getting slower and slower . Some queries takes too long to execute . SCHEMA Table contacts --------------------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------------+------------------+------+-----+---------+----------------+ | contact_id | int(10) unsigned | NO | PRI | NULL | auto_increment | | client_id | int(10) unsigned | YES | | NULL | | | name | varchar(60) | YES | | NULL | | | mail | varchar(60) | YES | MUL | NULL | | | verified | int(1) | YES | | 0 | | | owner | int(10) unsigned | NO | MUL | 0 | | | date_created | date | YES | MUL | NULL | | | geolocation | varchar(100) | YES | | NULL | | | ip | varchar(20) | YES | MUL | NULL | | +---------------------+------------------+------+-----+---------+----------------+ Table campaign_deliveries +---------------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+------------------+------+-----+---------+----------------+ | id | int(11) | NO | PRI | NULL | auto_increment | | newsletter_id | int(10) unsigned | NO | MUL | 0 | | | contact_id | int(10) unsigned | NO | MUL | 0 | | | sent_date | date | YES | MUL | NULL | | | sent_time | time | YES | MUL | NULL | | | smtp_server | varchar(20) | YES | | NULL | | | owner | int(5) | YES | MUL | NULL | | | ip | varchar(20) | YES | MUL | NULL | | +---------------+------------------+------+-----+---------+----------------+ Table campaign_queue +---------------+------------------+------+-----+---------+----------------+ | Field | Type | Null | Key | Default | Extra | +---------------+------------------+------+-----+---------+----------------+ | queue_id | int(10) unsigned | NO | PRI | NULL | auto_increment | | newsletter_id | int(10) unsigned | NO | MUL | 0 | | | owner | int(10) unsigned | NO | MUL | 0 | | | date_to_send | date | YES | | NULL | | | contact_id | int(11) | NO | MUL | NULL | | | date_created | date | YES | | NULL | | +---------------+------------------+------+-----+---------+----------------+ Slow queries LOG -------------------------------------------- Query_time: 350 Lock_time: 1 Rows_sent: 1 Rows_examined: 971004 SELECT COUNT(*) as total FROM contacts WHERE (contacts.owner = 70 AND contacts.verified = 1); Query_time: 235 Lock_time: 1 Rows_sent: 1 Rows_examined: 4455209 SELECT COUNT(*) as total FROM contacts WHERE (contacts.owner = 2); How can we optimize it ? Queries should take no more than 30 secs to execute? Can we optimize it and keep all data in one BIG database or should we change app's structure and set one single database to each user ? Thanks

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  • Memory usages in Linux drops frequently

    - by FunkyChicken
    I run a CentOS 5.6 (64bit) machine that has Nginx (latest version) running, with php-fpm (latest version). Things run very well, but since about 2 weeks I noticed in my Munin graphs that about every 2 hours the 'cache' usages drops. Before it used be a steady fully graph, that didn't seem to reset every so often. PHP-FPM settings: pm.max_children = 300 daemonize = yes pm = static listen = /tmp/fpm.sock pm.max_requests = 1000 I have checked the php-fpm.log, and about once per 5 seconds a child process is killed, and restarted. But this is all the time, so this does not explain the sudden drops. I only run Nginx, PHP (via fpm), Munin and vsftpd on this machine. No crons run at exactly the time of the drops. My question: What could be causing these drops in cache usage?

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  • PHP shared extensions on Linux

    - by F21
    I am running Ubuntu Server 12.04 and prefer to compile PHP myself as opposed to installing it using apt-get. PHP is running as PHP-FPM. When compiling extensions, I can set it to be compiled as a shared extension using something like --with-bcmath=shared and so on. Are there any benefits to compiling the extensions as shared? I also noticed that the extensions are compiled into a pretty convoluted folder. On my system (my php prefix is /usr/local/php-5.4.9) the extensions end up in /usr/local/php-5.4.9/lib/php/extensions/no-debug-non-zts-20100525. Is there a global way to set a folder so that all shared extensions will be compiled in there? I understand that I can do something like --with-foobar=shared,/usr/local/foobar/ but having to set the extension folder for each shared extension is inefficient and error-prone.

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  • Linux/Unix MTA with the smartest queue?

    - by threecheeseopera
    I am looking for an MTA that will allow me (a script, really) to proactively manage it's send queue in response to status codes returned by the remote servers I am delivering to. Basically, for each mail sent I would like to be able to react to the SMTP reply code returned by the remote server, ex. '250 OK', or to any error conditions like connection timeouts. Additionally, I would like to be able to manage the send queue moving forward based on this information, e.g. 'example.com has timed out the last 5 connection attempts, so no longer queue mail for recipients @example.com'. I am currently using postfix and perl to parse it's logs for this information, but I am playing a game of catchup that is prone to errors (out-of-order log entries etc.) and it's starting to get messy (some real ugly regexes ;). I really don't want to reinvent the wheel and use some language's smtp library; i would prefer to use a proven/fast/reliable MTA. I am however open to suggestions if what I need just isn't possible. Thanks for your help!

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  • linux dns server

    - by Clear.Cache
    Can someone explain to me how to easily setup a centos 5 (64bit) dns server? I want to use this strictly for dns for my clients who require rdns (ptr) for their domains. I do have IP delegation/authority from the data center and allocated IPs directly from ARIN. I just want to setup a Centos 5 box to use strictly as a dns server, perhaps with redundancy with a secondary, clustered (or not) dns server Server 1 = dns1.mycompany.com Server 2 = dns2.mycompany.com Then, I need simply instructions on how to create rdns records for clients upon request, especially in bulk amounts. Thank you.

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  • Linux centos trouble with egrep command in words folder

    - by seth
    i need the commands to list these things for a class but for the life of me i cannot figure it out if anyone could offer any insight on how to get so specific with the egrep command or just answer the questions it would be highly appreciated some i have already figured out but if they look wrong any corrections may help too List all words that have the letter a followed immediately by the letter z. egrep {a,}{z,} words List all words that have the letter a followed sometime later by the letter z (there must be at least one letter in between). Egrep {a,?,z} words List all words that start with the letter a and end with the letter z. egrep "^a.*z$" words List all five letter words that start with the letter a and end with the letter z. List all words that start with two capital letters followed immediately by at least one lower case letter. List all words with two consecutive a’s or i’s or u’s. Use {2} to denote “two consecutive” and the pipe character, |, to denote “or”. egrep [a|i|o] {2} words List all words that contain a q where the q is not immediately followed by a u. For instance, queen should not be in your list but Iraqi should be. List all entries in the file that contain at least one non-letter.

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  • How to make Tun module running at linux start

    - by harmony
    i installed Tun using: modprobe tun then did: lsmod | grep tun tun 83840 0 Please how to make Tun running at reboot? This is written on Hamachi website: ...Then add tun to the list of modules by using your favorite text editor and Create /etc/modules-load.d/tun.conf #Load tun module at boot. tun But this folder foes not exist in my /etc Is it wise to add line "modprobe tun" into /etc/rc.local ?

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  • php: fopen() of an URL breaks for domain names, not for numerical addresses

    - by b0fh
    After hours of trying to debug a third-party application having trouble with fopen(), i finally discovered that php -r 'echo(file_get_contents("http://www.google.com/robots.txt"));' fails, but php -r 'echo(file_get_contents("http://173.194.32.81/robots.txt"));' Succeeds. Note that as the webserver user, I can ping www.google.com and it resolves just fine. I straced both executions of PHP, and they diverge like this: For the numerical v4 URL: socket(PF_INET, SOCK_STREAM, IPPROTO_IP) = 3 fcntl(3, F_GETFL) = 0x2 (flags O_RDWR) fcntl(3, F_SETFL, O_RDWR|O_NONBLOCK) = 0 connect(3, {sa_family=AF_INET, sin_port=htons(80), sin_addr=inet_addr("173.194 poll([{fd=3, events=POLLOUT}], 1, 0) = 0 (Timeout) ...[bunch of poll/select/recvfrom]... close(3) = 0 For the domain name: socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP) = 3 close(3) = 0 PHP didn't even try to do anything with that socket, it seems. Or even resolve the domain, for that matter. WTF ? Recompiling PHP with or without ipv6 support did not seem to matter. Disabling ipv6 on this system is not desirable. Gentoo Linux, PHP 5.3.14, currently giving a try to PHP 5.4 and see if it helps. Anyone has an idea ? EDIT: php -r 'echo gethostbyname("www.google.com");' Works and yield an ipv4, while php -r 'echo(file_get_contents("http://[2a00:1450:4007:803::1011]/"));' Seems to return a blank result. EDIT 2: I didn't even notice the first time, that the v6 socket opened when the name is used is a SOCK_DGRAM.

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  • Internet cafe software for linux

    - by pehrs
    I have gotten a request to roll out a total of 8 internet cafe's in a large network. Budget is non-existent as it will all be done for a non-profit. I was planing to use Ubuntu and live-cds to minimize the amount of management required, but I can't seem to find any suitable internet cafe system that is Ubuntu based. The requirements are pretty basic: It needs to keep track of logged in time and log out users when their time it up. No billing will be done, it will just be used to ensure people can share the computers fairly. It should be possible to force logout from a central system. Users will be unskilled, so it has to have a GUI. What (preferably free, considering the shoe-string budget) software would you suggest to manage this?

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