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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanler

  I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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• Ultra Low Latency Linux Distribution or Kernel

  - by Zanlor

  I'd like to know if there are any linux distributions that are focused on low latency networking. The area I'm working in is algorithmic trading, and extremely low latency comms between machines is a must. The current h/w we're using is 10g ethernet, we're looking into things like infiniband RDMA and Voltaire VMA I've googled around, and have only been able to find tidbtits of kernel patches, command line options and hardware suggestions. I'm looking for a complete solution, specially built kernel, kernel bypass features, essentially all the goodies rolled up into one package - does such a thing even exist? I ask as a lot of this stuff seems to be a black art, people keep secret what they know works etc.

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• How could I easily pack a directory to an ext4 loop partition image?

  - by Alvin Wong

  I would like to pack the content of a directory into an ext4 partition image easily, without mounting a loop device. Background: I am building a version of Android which will mount system partitions as a loop device for ARM. Though I can create those partition images by hand using loop devices, it is very troublesome. I want to use an sh script to automatically do the work, and without needing to loop mount the dd-created image and use cp -rp. The best is to directly pack the files into an image file. Question: Is there any simple command-line tools without needing loop mount and root permission that can pack files into an ext4 partition image?

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• Cannot connect remote mysql, Cpanel?

  - by BerkErarslan

  I use centos and cpanel I need to use remote mysql with php. I add the ip which I try connect to server to "Remote Database Access Hosts" on Cpanel. However, when I try to connect server with this code: <?php $link = mysql_connect("server_ip", "xxx", "xxx") or die(mysql_error()); $db = mysql_select_db("xxx", $link) or die (mysql_error()); print_r($db); I have error like this: Warning: mysql_connect() [function.mysql-connect]: Can't connect to MySQL server on 'xxxx' (10060) in C:\AppServ\www\test.php on line 3 Can't connect to MySQL server on '94.138.204.234' (10060) I also try to connect using "server_ip:3306" but it still doesn't work. How Can I solve this problem ?

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• Arguments passed on by shell to command in Unix

  - by Ryan Brown

  I've been going over this question and I can't for the life of me figure out why the answer is what it is. How many arguments are passed to the command by the shell on this command line:<pig pig -x " " -z -r" " >pig pig pig a. 8 b. 6 c. 5 d. 7 e. 9 The first symbol is supposed to be the symbol for redirected input but the site isn't letting me use it. [Fixed.] I looked at this question and said ok...arguments...not options so 2nd pig, then " ", then -r" ", 4th pig and 5th pig...-z and -x are options, so I count 5. The answer is b. 6. Where is the 6th argument that's being passed on?

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• Errors installing the Curl library with PHP/Apache/Windows

  - by MarathonStudios

  I'm having a hell of a time getting Curl to work with PHP/Apache on my Windows XP 64-bit development box. I have PHP and Apache successfully installed, but when I tried to enable Curl I get the following error (twice) from PHP on Apache startup: "PHP Startup: Unable to load dynamic library 'C:\php\ext\php_curl.dll' - The operating system cannot run %1." I did uncomment the correct line in PHP.ini. I did move the two DLLs (php_curl.dll and ssleay32.dll) into my PHO root, into my System32, even my apache root - but no matter where I put them, PHP can't find them. I keep getting the error above. Anyone have any idea how to remedy this?

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• sharepoint administrative server not started causing sharepoint deployment instability

  - by Nathan

  When i deploy anything to a variety of sharepoint servers i get problems with some packages failing, from what i can see the only error given is as below. The timer job for this operation has been created, but it will fail because the administrative service for this server is not enabled. If the timer job is sched uled to run at a later time, you can run the jobs all at once using stsadm.exe - o execadmsvcjobs. To avoid this problem in the future, enable the Windows ShareP oint Services administrative service, or run your operation through the STSADM.e xe command line utility. Is this a known problem? I googled for the text but got only one other person with the problem who simply worked round it. I'm trying to batch deploy solutions programmatically and so these errors render the whole code worthless if you have to go back and redo bits by hand afterwards. Is batch deployment simply not possible? Thanks!

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• Can I use a display driver from Windows 8 in Windows 7?

  - by adam0101

  My latest display driver doesn't support WDDM 1.0, and I need it to be at least version 1.1. I've been attempting to get the Windows Phone 7 SDK working on my HP Pavillion dv9000, but the phone emulator requires 1.1 or higher. My drivers are as up-to-date as they can get. I even tried a modded driver found here, but no go. Then, while evaluating Windows 8 Developer Preview on a different partition I noticed that dxdiag.exe showed it was using WDDM 1.2. I tried installing Windows Phone 7 SDK on Windows 8, but I get an "Internal Error" popup and "Connection failed because of invalid command-line arguments" in the error window in Visual Studio. I'm guessing because Windows Phone 7 SDK isn't supported on Windows 8 yet. So my question is this: Can I get Windows 7 to use the display driver Windows 8 is using to get WDDM 1.2 on Windows 7 and how would I go about doing it?

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• why use branches in svn?

  - by ajsie

  i know that you could organize your files according to this structure in svn: trunk branches tags that you copy the trunk to a folder in branches if you want to have a seperate development line. later on you merge this branch back to trunk. but i wonder why me and my group should do this. why should one copy the trunk to a branch and work with this copy just to merge it back to the trunk, and mean while the code is frequently updated/commited to stay in sync with the trunk. why not just work with the trunk then? what is the benefits with creating a branch? would be great if someone could shed a light on this topic. thanks in advance

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• china and gmail attacks

  - by doug

  "We have evidence to suggest that a primary goal of the attackers was accessing the Gmail accounts of Chinese human rights activists. Based on our investigation to date we believe their attack did not achieve that objective. Only two Gmail accounts appear to have been accessed, and that activity was limited to account information (such as the date the account was created) and subject line, rather than the content of emails themselves.” [source] I don't know much about how internet works, but as long the chines gov has access to the chines internet providers servers, why do they need to hack gmail accounts? I assume that i don't understand how submitting/writing a message(from user to gmail servers) works, in order to be sent later to the other email address. Who can tell me how submitting a message to a web form works?

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• How do I enable SELinux when booting a ramdisk from a CD/DVD?

  - by JeffG

  I have a bootable DVD which boots the same Kernel as the Hard Drive (which uses SELinux). I have copied /etc/selinux and all kernel modules to my ramdisk, and have tried various combinations of selinux=1 and selinux 1 with enforcing 1 and enforcing 0. as Kernel boot parameters. All files contained in the checkpolicy, libselinux, policycoreutils, selinux-policy and selinux-policy-targeted rpms have also been copied into the ramdisk tree. After the system boots from the ramdisk, I check dmesg: % dmesg | grep -i selinux Kernel command line: initrd=idrd.img ramdisk_size=110476 selinux=1 SELinux: Initializing. SELinux: Starting in permissive mode selinux_register_security: Registering secondary module capability SElinux: Registering netfilter hooks But SELinux isn't running: % /usr/sbin/getenforce Disabled % /usr/sbin/setenforce 1 /usr/sbin/setenforce: SELinux is disabled Neither /var/log/messages nor /proc/kmsg hold clues.

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• Looking for Light Time Management Software Suggestions (for Mac)

  - by tmo256

  I'm looking for a simple project management app that performs task scheduling, along the line of Merlin or MS Project, but no where near as robustly. I don't need to deal with other (human) resources, but I work on anything from 3 to 6 different projects at a time. What I'd like is to be able to input deadlines and tasks, and have a schedule suggested to complete them. I do technical work, but I don't think I need anything specifically for software development, especially considering I do plenty of other kinds of things, like graphic design and social media PR. I'd really like this to be dead simple, as simple as possible. Suggestions? OmniPlan, something web-based? Definitely cannot afford anything too extravagant, really looking for something under $200. Thanks for your input!

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• Connectiong adsl router/modem and router with bridgemode

  - by Zvonko Telefonko

  I have one adsl modem/router which is not "top" of the line and it lack allot of options which I need. I was able to acquire one Cisco router recently which has all options that I need ( like DMZ, VPN, port forwarding, etc). I'm interested, if I connect the old modem/router to new Cisco router using bridge mode, will I be able to use all the features on the Cisco? For instance, the old router is lacking of port forward options. Does this mean that I will not be able to use port forwarding on Cisco router either or, since I will be using bridge mode, this will not affect Cisco router and it will work as the modem is in him? thank you

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• apt-get install phpmyadmin on debian doesn't install /etc/phpmyadmin/apache.conf

  - by Christian Nikkanen

  I'm trying to install phpmyadmin on my webserver, using this guide: http://www.howtoforge.com/ubuntu_debian_lamp_server I did that once, and it worked like a dream, but I hated the looks of phpmyadmin (maybe the oldest layout ever) and decided to delete it, and didn't know that deleting is done with apt-get remove phpmyadmin and did in phpmyadmin directory rm * and thought that it's done. However, as I can't find the debian build of phpmyadmin anywhere, I want to install it again, but when I add Include /etc/phpmyadmin/apache.conf to /etc/apache2/apache2.conf, and restart apache, it give's me this error: apache2: Syntax error on line 73 of /etc/apache2/apache2.conf: Could not open configuration file /etc/phpmyadmin/apache.conf: No such file or directory Action 'configtest' failed. The Apache error log may have more information. failed! No matter how I try, I always get this error, and phpmyadmin isn't there.

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• Problem to connect to MySQL server (error #2002) in PHP

  - by Martin

  I installed ZWAMP 1.0.7 (on Windows 7), but I'm having a weird problem. I can't connect to my MySQL server from any PHP script. If I try to use MySQL command line everything works fine but PHPMyAdmin retruns error #2002. I'm not sure whether it's important or not but MySQL server is not able to create socket file. I don't know what's the problem but I think everything is configured in my.cnf properly. Do you have any ideas?

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• Load balancing with rsync

  - by David

  i have 2 server with public ip: SERVER A - 10.10.10.11 SERVER B - 10.10.10.12 both of them are centos 6 in OS, installed nginx with php-fpm, 2 exact same website stored at: /var/www/html. Domain with: myxdomain.com and dns hosted with cloudflare ( since cloudflare do support round robin ) to point the domain to A record of 10.10.10.11 and 10.10.10.12. I know that round robin dns does not cover the failover or fallover, but it does not matter, what i need is: How do i sync the both content of /var/www/html server A and server B to be exactly same? Lets say: 1) user uploaded their file to server A, the file content will be sync to server B as well. 2) user uploaded their file to server B, the file content will be sync to server A as well. rsync will be good choice here? Any example of command line and cronjob time that suitable? thanks

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• Is ServerManager module available on Windows 7?

  - by ruslan

  Is ServerManager module available on Windows 7 Ultimate ? I think (but I'm not sure because I never looked at output before) the PS script that I have worked before but after some problems with IIS7 installation it stopped working. Following script import-module servermanager fails with error Import-Module : The specified module 'servermanager' was not loaded because no valid module file was found in any module directory. At line:1 char:14 + import-module <<<< servermanager + CategoryInfo : ResourceUnavailable: (servermanager:String) [Import-Module], FileNotFoundException + FullyQualifiedErrorId : Modules_ModuleNotFound,Microsoft.PowerShell.Commands.ImportModuleCommand I found recommendation to run Dism.exe /Online /Enable-Feature /FeatureName:ServerManager-PSH-Cmdlets on my machine but it also fails with error Feature name ServerManager-PSH-Cmdlets is unknown.

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• Replace an IP address with it's whois using bash

  - by user2099762

  I have a traffic log similar to this "page visited" for xxx.xxx.xxx.xxx at 2013-10-30 and I would like to replace the ip address with the result of it's whois lookup. I can export the ip addresses to a separate file and then do a whois on each line, but im struggling to combine them all together. Ideally i'd like to replace the ip address in the same string and print the new string to a new file. So it would look like "page visited" for example.com at 2013-10-30 Can anyone help Here's what I have so far grep -o '[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}\.[0-9]\{1,3\}' clean_cites.txt > iplist.txt for i in `cat iplist.txt` do OUTPUT=$(geoiplookup -f /usr/share/GeoIP/GeoIPOrg.dat $i) echo $i,$OUTPUT >> visited.txt done Like I said,this produces a separate file with a list of ip addresses and their relevant hostnames, so I either need to search for the ip address in file and and replace it with the text in file b (which will give the ip address and hostname) or replace the ip address in place. Thanks

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• Postgres error messages in Apache error log

  - by Warren Pena

  I'm running Apache 2.2, PHP 5.2, and Postgres 8.2 on Windows, and I'm seeing something funky in Apache's error.log file. Occasionally, I'll see the message "row number -1 is out of range 0..-1" pop up over and over. Unlike all the other lines in that log file, there's no timestamp or log level. Just that exact string. Googling around, it appears that message is, character for character, a common Postgres error message, but is not an Apache error. I've seen it happen multiple times, and on several different servers. I can't seem to reproduce it, though. I've tried throwing all sorts of error ridden database queries and result set inquiries at Postgres via PHP, and none of them seem to trigger that line being written to the log file. Is it possible for Postgres errors to be ending up in my Apache log file, and if so, how? What would trigger an error message like that? Thanks!

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• Trouble installing php memcache extension

  - by user35346

  I'm trying to install memcache on MAMP but I get the warning below, and when I continue it seems to complete properly. I add the line extension=memcache.so to the php.ini and restart MAMP but phpinfo() doesn't list the memcache extension. $ ./pecl install memcache downloading memcache-2.2.5.tgz ... Starting to download memcache-2.2.5.tgz (35,981 bytes) ..........done: 35,981 bytes 11 source files, building WARNING: php_bin /Applications/MAMP/bin/php5/bin/php appears to have a suffix 5/bin/php, but config variable php_suffix does not match running: phpize Configuring for: PHP Api Version: 20041225 Zend Module Api No: 20060613 Zend Extension Api No: 220060519 Enable memcache session handler support? [yes] : yes ... Build process completed successfully Installing '/Applications/MAMP/bin/php5/lib/php/extensions/no-debug-non-zts-20060613/memcache.so' install ok: channel://pecl.php.net/memcache-2.2.5 configuration option "php_ini" is not set to php.ini location You should add "extension=memcache.so" to php.ini

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• Problem adding public key for apt

  - by highBandWidth

  I was trying to get the official mongodb for Ubuntu, following the instructions at http://www.mongodb.org/display/DOCS/Ubuntu+and+Debian+packages After adding the deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen line in my sources, I need to add the pgp key since synaptic says W: GPG error: http://downloads-distro.mongodb.org dist Release: The following signatures couldn't be verified because the public key is not available: NO_PUBKEY 9ECBEC467F0CEB10 Again following instructions, I did sudo apt-key adv --keyserver keyserver.ubuntu.com --recv 7F0CEB10 this says Executing: gpg --ignore-time-conflict --no-options --no-default-keyring --secret-keyring /etc/apt/secring.gpg --trustdb-name /etc/apt/trustdb.gpg --keyring /etc/apt/trusted.gpg --primary-keyring /etc/apt/trusted.gpg --keyserver keyserver.ubuntu.com --recv 7F0CEB10 gpg: requesting key 7F0CEB10 from hkp server keyserver.ubuntu.com ?: keyserver.ubuntu.com: Connection refused gpgkeys: HTTP fetch error 7: couldn't connect: Connection refused gpg: no valid OpenPGP data found. gpg: Total number processed: 0 Interestingly, I also get $ apt-key list gpg: fatal: /home/myname/.gnupg: directory does not exist! secmem usage: 0/0 bytes in 0/0 blocks of pool 0/32768 How can I get apt to use this source?

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• Change Groupwise 7 User Password from NetWare Server Console

  - by Scott Wolf

  I have a Groupwise 7 server in place that we use for testing purposes. The previous administrator didn't bother to make a note of any of the account passwords on the machine. I have access to the Server Console...but I can't login via ConsoleOne or anything like that. Is there a command line utility that I can run from the Server Console to reset a Groupwise user password? I just need to have one account up and running for testing. If there's a CLI utility I can use to be able to create a new account, that would work just as well. Any help would be greatly appreciated...I'm kinda stuck at this point.

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• Unable to do forwarding in BIND DNS?

  - by preethika

  I have BIND working on Windows Server 2003. i want to forward my queries to another server. Recursion is working but forwarding is not working. can u guide me to set it. i've given the following in the options: options { directory "c:\named\zones"; allow-transfer { none; }; forward only; forwarders { 8.8.8.8 ; }; recursion no; }; is the format for forwarding correct in the above. if not what is the format. Am i to give any port number in the forwarders line? Does forwarding have any particular port number? Thank You in advance....

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• ffmpeg trimming video

  - by Dori

  I am having a problem using ffmpeg which is driving me a little mad, so I hope someone can help me out. I have a 13 MPEG-4 .mp4 video of which I am attempting to trim the first two seconds off using ffmpeg and display in an Android app. From the numerous tuts online i am excecuting the following on the command line ffmpeg -i untrimmed_video.mp4 -vcodec copy -ss 2 trimmed_video.mp4 with no luck as it outputs a video of 4-seconds length (i have no idea where its getting 4 from), if i change this to 3 i still get a 4 second video, if i set it to 10 i get unplayable output. if i move the -ss arg to ffmpeg -vcodec copy -i untrimmed_video.mp4 -ss 2 trimmed_video.mp4 i get output the same length as the input, same as if i move to the end. I have tried lots of variations as orders and nothing seems to work, is this a bug, am i doing something wrong?! please help!!!

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• Python server does not excecute PHP script: permission denied

  - by krisvandenbergh

  I am trying to execute a PHP file through a Python server. However, I get the following error: File "/System/Library/Frameworks/Python.framework/Versions/2.6/lib/python2.6/CGIHTTPServer.py", line 255, in run_cgi os.execve(scriptfile, args, os.environ) OSError: [Errno 13] Permission denied The python server is running though. What have I done so far? Chmod'ed recursively all directories to (chmod -R a+x) (I know this is not secure but its just for testing purposes) for both Python installation directories and my scripts. Tried to find out if python server is running as root through ps aux grep py I am out of ideas. What could be going wrong else? Thanks for the feedback.

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