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  • I know the big picture but can't put it in place

    - by Simbilim
    Hi, I'm interested in web development and by that I mean the bigger projects like facebook or twitter. I know the basics of java, css, php and mysql. I know there is a lot more out there. I read about it. But I don't know what the purpose is and how to put in place. Things like: Scribe, thrift, casandra, Unix/Linux, shell/perl/python scripting, PostgreSQL, MongoDB, non-relational NoSQL datastores, JVM, nginx I want to know why they need it, how they use it and what te purpose is. What I need is a book like technical background of facebook for dummies or so. Are there any books or websites that explain this from scratch? Thank you!

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  • How to know any request type with comet in tomcat 6

    - by Alvin
    Hi, I want to create a chat application in Tomcat 6.0, but before allowing any user for chatting I want to authenticate a user or registering its account to the database by passing request to the servlets at the comet Event type Begin. But I don't know how to know about the request type. How can I know a user has already been logged in, or he is making a request for registering his account. How can I know this by implementing CometProcessor interface? Is there any better way to do that task?

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  • Amazon AWS EC2 + Puppet, get Puppet to know AWS instance tags

    - by Piotr Jasiulewicz
    I am having a problem with my AWS deployment, fairly new to AWS and Puppet. So coming to my question - can you distinguish puppet nodes with AWS machine tags or CNAME domains? A little background about the plan: have multiple clusters of machines, one php cluster, one legacy php cluster, one java cluster, one perl cluster control configuration with puppet - still pretty new to puppet but as a developer I like the idea of being able to version control configuration of servers have autoscaling enabled on those clusters - obviously the main benefit of the cloud that makes the much hight cost when it comes to any reasonable performance worth it (those amazon machines are slower than my phone...) deployment controlled by Capistrano, this makes things a lot easier So in AWS you get those super nasty public/private machine dns's... no way you can identify machines on those. In order to easer the problem, seams like AWS want's you to tag everything - so I did. Found a script that makes a CNAME record for each machine with the tag "ShortName" thanks to the Route53 API. Every machine has a ShortName tag that becomes its CNAME, unfortunately puppet still resolves the private dns name. I'd like to have node 'perl-cluster'{} in puppet, anyone any clue ho to achieve this? Thanks

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  • How to know which block device maps to which physical drive

    - by Karolis T.
    I have a server with software RAID 1, two hot-swap sata disks. One hard drive started showing errors, I'm thinking about removing and replacing it, only problem is that I have no idea which of the two correspond to which devices. And I can't shut the server down to find out. I have /dev/sda and /dev/sdb, /dev/sda is the failing one. Thought about doing something along the lines # mdadm --manage /dev/md0 --remove /dev/sda1 then somehow stop/suspend the drive using tuning software and try to listen which of the two stopped, but that's not gonna work in a noisy server environment. Drive panels have no LEDs. Thanks for any ideas!

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  • Does any know fix/cause of USB drives that lose connection

    - by Burch Kealey
    I have been having significant problems trying to copy files to a USB drive (G0-Flex 1.5 tb) No matter what I use to try to copy the files (python code, Windows copy and paste or Drobo Copy utility) I ultimately get a failure. The failure is always some indication that the device is not ready or able to be written to. I am pretty sure the problem is that the drive is losing its connection. I have done everything I can find so far including setting the USB Root hub to never turn off the power, I updated some usb drivers etc. I have found references to this problem primarily with Win7-64 bit. I have also had USB connection problems with other devices- we kept losing a connection to our Bravo Disc Publisher when we went to Win7 and finally bought a newer model and have not had problems since. Any pointers about diagnosing and or understanding the problem would be appreciated.

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  • My Mac is slow but don't know what's slowing it down

    - by duality_
    My Mac (Macbook Pro) is sometimes slow doing basic tasks, like browsing the web or something like that. If I open Activity Monitor, I have (maybe) one program that is about 10 % CPU, others are below 1 %. My CPU usage is not full. I still have more than 2 GB of free memory (out of 5 GB). There is no heavy I/O activity like copying files. My open programs are Google Chrome (6 tabs, none of which are in some way (flash, many DOM objects, Javascript) have IMO, except maybe Gmail), Activity Monitor, Finder, Sublime Text 2 (text editor) and iTerm (terminal). What is causing the slowdown? "Slow" being: taking time to write these characters (I press the keyboard keys but there is a delay before I see them on the screen), changing tabs or programs, etc.

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  • How to know which speed of RAM can I use

    - by Phuong Nguyen
    I have a Dell Vostro 1000 which uses ATI RS480 mainboard. Specification says that the front bus of such mainboard is 1Ghz. However, the default RAM came with mainboard is PC4200 (533Mhz). I wonder if I can replace them with PC6400 (800Mhz) or at least PC5300 (667Mhz)?

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  • thttpd: Daemon exiting, I don't know why

    - by Tobe
    I run thttpd to serve some perl files. But for some reason the daemon is exiting every second or third day. Strangely it's always at 6.25 am. Here are some lines from syslog: Nov 10 06:25:40 b1 thttpd[6370]: up 86404 seconds, stats for 86404 seconds: Nov 10 06:25:40 b1 thttpd[6370]: thttpd - 25 connections (0.000289338/sec), 1 max simultaneous, 625000 bytes (7.23346/sec), 2 httpd_conns allocated Nov 10 06:25:40 b1 thttpd[6370]: libhttpd - 30 strings allocated, 8200 bytes (273.333 bytes/str) Nov 10 06:25:40 b1 thttpd[6370]: map cache - 0 allocated, 0 active (0 bytes), 0 free; hash size: 0; expire age: 1800 Nov 10 06:25:40 b1 thttpd[6370]: fdwatch - 20902 selects (0.24191/sec) Nov 10 06:25:40 b1 thttpd[6370]: timers - 2 allocated, 2 active, 0 free Nov 10 06:25:40 b1 thttpd[6370]: exiting Any ideas?

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  • Reset user passwd when you don't know it

    - by warren
    I have a small problem. I have shared keys setup on my domain, so I never type my password to login anymore. I've forgotten my password now. This is a problem because only my user can sudo. Password authentication for root has been disabled, so without my password, I cannot do maintenance on my web server. Is there a way to reset my password as my [now only] key-authenticated user? Specifically, can this be done on CentOS 4?

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  • Know which Apps to Remove From MSConfig with this Startup Applications List

    - by Mit Naik
    Just found userfull information on Internet and thought it would help all of users. This list of startup applications is a really handy resource for cleaning up msconfig entries that have overtaken old computers. It catalogs tons of different startup programs, what they do, and which ones you should delete, leave running, or decide based on the program's usefulness. It even has a nice search box so you can search through the tens of thousands of entries. Hit the link below to check it out, and if your relatives' computer is especially broken, be sure to check out our guide to fixing your relatives' terrible computer. http://www.sysinfo.org/startuplist.php Please update the list here if you got any other tools or sites which can be help full to others

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  • Permissions nightmare - tried all I know

    - by Ben
    Working on a new client's dev site, which is a wordpress install on a Plesk box. I have SSH root access, and FTP access through a separate account. What I've done so far Initially I couldn't make any changes to any files at all. The permissions on all the template files looked a little screwy (644), so I figured change them to allow group, and add myself to the group: CHMOD Recursive on the theme folder to set everything to 664 Quickly realised I'd broken it, set the folders to 755, kept files as 664 Ownership on all files is a mixture of root:root and 500:500 (there is no user nor group with the ID of 500 on the server). Added myself to the group 'root' so I could modify the files too The Problem This worked OK, in terms of being able to edit the existing files, so I began working. However, I can't upload to the directory, even having run CHOWN -R root:root templatefolder/ and being in the root group. I feel like I must be missing something obvious, and it's doing my head in. Questions: Files in the install owned by 500 with group 500 - I've looked in /etc/group and /etc/passwd and there is no user nor group with this ID. Is that left over from another developer's setup or the previous server (they moved recently)? Is being in the 'root' group enough, or do I need to own the theme folder as 'myftpuser' in order to upload and create new files? Like I say, I have edit access, so I got myself this far. I'm now questioning what to do next!

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  • don't know how this virtual directory structure was setup on iis6

    - by deostroll
    Our development server has a setup as follows: \\DEVSRVR\WEBSITES\COMMON +---include Here is where all css and script files resides. They are required by various web applications \\DEVSRVR\WEBSITES\TESTING\SAM +---Backup ¦ +---bin +---bin +---help Here is where an application resides. Suppose there is an aspx page under the folder called SAM, we'd normally issue an http request as follows: http://testing.apps/sam/default.aspx We believe that testing.apps virtual name points to \\devsrvr\websites\testing folder. Suppose there is a css file called menu.css inside common/include. We'd simply have to make the following http call to get it: http://testing.apps/common/include/menu3.css This works!!! I don't understand how? There is no such folder called common inside of testing...

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  • How to know whether mongodb is running on 64 bit mode or 32 bit mode

    - by Jim Thio
    My programmer install mongodb. Then somehow it doesn't work. I run C:\mongod\bin>mongod mongod --help for help and startup options Sat Aug 11 22:57:50 Sat Aug 11 22:57:50 warning: 32-bit servers don't have journaling enabled by def ault. Please use --journal if you want durability. Sat Aug 11 22:57:50 Sat Aug 11 22:57:50 [initandlisten] MongoDB starting : pid=3800 port=27017 dbpat h=/data/db 32-bit host=haryantoi5 Sat Aug 11 22:57:50 [initandlisten] Sat Aug 11 22:57:50 [initandlisten] ** NOTE: when using MongoDB 32 bit, you are limited to about 2 gigabytes of data Sat Aug 11 22:57:50 [initandlisten] ** see http://blog.mongodb.org/post/13 7788967/32-bit-limitations Sat Aug 11 22:57:50 [initandlisten] ** with --journal, the limit is lower Sat Aug 11 22:57:50 [initandlisten] Sat Aug 11 22:57:50 [initandlisten] db version v2.0.7-rc1, pdfile version 4.5 Sat Aug 11 22:57:50 [initandlisten] git version: 9efe4cce272373b52b96de1309c1fbf 0c984305f Sat Aug 11 22:57:50 [initandlisten] build info: windows sys.getwindowsversion(ma jor=6, minor=0, build=6002, platform=2, service_pack='Service Pack 2') BOOST_LIB _VERSION=1_42 Sat Aug 11 22:57:50 [initandlisten] options: {} ************** Unclean shutdown detected. Please visit http://dochub.mongodb.org/core/repair for recovery instructions. ************* Sat Aug 11 22:57:50 [initandlisten] exception in initAndListen: 12596 old lock f ile, terminating Sat Aug 11 22:57:50 dbexit: Sat Aug 11 22:57:50 [initandlisten] shutdown: going to close listening sockets.. . Sat Aug 11 22:57:50 [initandlisten] shutdown: going to flush diaglog... Sat Aug 11 22:57:50 [initandlisten] shutdown: going to close sockets... Sat Aug 11 22:57:50 [initandlisten] shutdown: waiting for fs preallocator... Sat Aug 11 22:57:50 [initandlisten] shutdown: closing all files... Sat Aug 11 22:57:50 [initandlisten] closeAllFiles() finished Sat Aug 11 22:57:50 dbexit: really exiting now It seems that mongod is running on 32 bit. I have a 64 bit computer and I want to run mongodb in 64 bit enviroment. How do I do so?

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