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• Do I need to know good javascript in order to use jquery?

  - by Eric Gates

  I do not know javascript right now but I am planning on learning it. My question is do I need to have a good understanding of javascript in order to use jquery? I already know actionscript and php which are quite similar. Should I study javascript before learning jquery?

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• What's the best way to get to know linux or BSD kernel internals?

  - by Michal Piaskowski

  I'd like to gain better knowledge of operating system internals. Process management, memory management, and stuff like that. I was thinking of learning by getting to know either linux or BSD kernel. Which one kernel is better for learning purposes? What's the best place to start? Can you recommend any good books?

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• C# CodeDom - making project's forms accessible for scripts.

  - by michal

  Hi, I'm learning CodeDom scripting, I started with http://www.c-sharpcorner.com/uploadfile/mgold/codedomcalculator08082005003253am/codedomcalculator.aspx Now I'd like to allow script modify the project's form (for learning purposes only). I suppose I need to create new field for a class I'm generating which refers "this". However I have no idea how can I set a reference for script-accessible object ... ? Or can I directly publish some class member (like "this" or "button1") to a CodeDom script structure?

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• I want to learn a new language!

  - by Alex

  Hi, I'm a college student majoring in computer science. I know java and will be learning C++ the next couple years at school. I want to add another language to my repertoire and have gotten conflicting advice: Ruby, Python, Perl, JavaScript, PHP, AJAX, among others. I was wondering what everyone's opinions were on the relative value of each of these languages in the job market, the ease of learning of each of the languages, and just personal preferences when it comes to the languages mentioned above. Thanks!

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• what is a fun beginner project?

  - by Atticum

  I am learning HTML and I have a good book to learn with but my cousin told me that I should pick a fun project to learn how to program but im not sure what I should do. what is the most fun project to do when you are learning HTML?

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• If I want to learn javascript by small project, what should I do?

  - by Turtle

  Hey, guys! I found javascript is not so easy to master. And I want to dive into it. I think learning by using is a good way. Since javascript is different from other C-style language, what kind of project is good for learning? Thanks.

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• How Can I Remove The 'file:\\' From the Return Value of Path.GetDirectoryName() in C#

  - by Nano HE

  string path = Path.GetDirectoryName( Assembly.GetAssembly(typeof(MyClass)).CodeBase); output: file:\d:\learning\cs\test\test.xml What's the best way to return only d:\learning\cs\test\test.xml file:\\ will throw exception when I call doc.Save(returnPath) ,however doc.Load(returnPath); works well. Thank you.

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• How well do you need to know HTML before delving into CSS?

  - by Shailesh Tainwala

  Is knowledge of HTML beyond the basics a prerequisite for learning CSS? I am making a learning plan so this will help me evaluate the time required better.

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• How do I make non-framework code to framework code? (PHP)

  - by ggfan

  I just started using CakePHP and it's very different from just normal procedural or basic OOP PHP. I am still learning PHP and still read "beginning PHP/mysql" books that teaches you basic PHP. Also lots of sites online provide code that isn't for a framework. Is the only way to make non-framework code to say a framework, say cakePHP, by learning cakePHP thoroughly than rewriting the code yourself to fit the MVC model?

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• What is the C# equivalent to Stroustrup's "The C++ Programming Language"?

  - by nbolton

  Simple question. Many consider "The C++ Programming Language" by Bjarne Stroustrup to be the de facto for learning advanced C++. What is the equivilent book for learning C# to the most advanced level?

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• A nuts and bolts reference to C# performance and memory use

  - by phil

  I wonder if anyone could point me in the direction where I can read about the nuts and bolts of C#. What I'm interested in learning are method call costs, what it costs to create objects and such. My aim of learning this is to get a better understanding of how increase the performance of an application and get a better understanding of how the C# language works. The reference should preferable be a book, a book that I can read cover to cover.

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• Entity Framework or something else?

  - by RonJ

  I am just switching from C to C# and would like to invest sometime learning database work. I am overwhelmed with the options: Linq-to-sql, ADO.NET. nHibernate, EntityFramework, plain old sql (I am used to this). Since I have only limited 'learning' hours available (about 2.5 hours per day), where should I invest my time? I don't want to learn something that will be obsolete next month or for which no one will hire me.

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• FTP through HAProxy

  - by Menda

  I have a machine, which is the Host and has HAProxy installed in it and working. Then I have a Guest KVM virtual machine running inside the Host with an IP 192.168.122.152. I installed an FTP server in the Guest machine with VSFTPD. From the Host, if I try the command $ ftp -p 192.168.122.152, works perfectly and I can connect to the Guest FTP. I need to remark that this FTP is configured as passive, but both passive and active connections are working from the Host. This is an extract of part of /etc/vsftpd.conf in the Guest: # Passive mode connect_from_port_20=NO tcp_wrappers=YES listen_address=192.168.122.152 pasv_enable=YES pasv_promiscuous=NO port_enable=YES port_promiscuous=NO pasv_max_port=10000 pasv_min_port=10250 Now it's time to make it accessible from outside, so I configure /etc/haproxy/haproxy.cfg like this: listen FTP_Default *:21 server ftp01 192.168.122.152 check port 21 inter 10s rise 1 fall 2 listen FTP_Range *:10000-10250 server ftp01 192.168.122.152 check port 21 inter 10s rise 1 fall 2 But if I try to connect from other machine in internet $ ftp -p $PUBLICIP, it only responds: Connected to <PUBLICIP>, but it doesn't ask for the login and password. Something in the HAProxy config must be wrong, because it's the only point where it fails. By the way, I tried to adapt my configuration to this one in this blog. Thanks.

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• James - mail server configuration help needed

  - by Chaitanya

  Hi, I am trying to setup James mail server on a linux machine. The linux machine has public static ip address assigned. I installed James and added in the config.xml added the servername as mydomain.com. In the DNS for mydomain.com, I have created a A-record, say mx.mydomain.com, which corresponds to the ipaddress of the above mail server machine. Then added mx.mydomain.com as MX record for mydomain.com. In James, I have created a new user test. Then from gmail, I sent a mail to [email protected]. The mail is not received back and it didn't even bounce back. The linux machine is behind a firewall with only 22, 80, 8080 ports open for external network. My question here is, Do I require do open any other ports on the firewall so that the mail I send from gmail arrives to James? If it's not the port problem, any views on solving this issue? I don't want to send mails from this server. It's only for receiving the mails.

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• Sending microphone input over Remote Desktop 7.0

  - by Taylor Price

  I am using Remote Desktop 7 (the new version that came out with Windows 7) to control a Windows XP Pro machine. I have selected "Record from this computer" in the Remote Audio settings. When I connect to the machine, go to the control panel, open the sound panel, and go to the audio tab, I find that the default sound playback device is "Microsoft RDP Audio Driver". However, there is no default sound recording device. As expected, my IP phone thinks there is no recording device. If I am sitting in front of the computer with a mic plugged in, it works just fine. Has anybody else been able to get this work appropriately? Is there anything that I have to setup on the XP machine to get this working? Thanks in advance. Edit: As John T pointed out below, you have to be connecting to a Windows 7 Enterprise or Ultimate machine for this to work. I've also found out that Multi-monitor support has the same requirement.

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• Disable local delivery in Sendmail

  - by Luke P M

  I am using Sendmail on a Centos server to send email for PHP scripts, but the problem is that mail is delivered to a local mailbox on the machine rather than what is specified in the MX records for the domain - which actually point to another machine I use for email. I would like sendmail to not try and locally deliver mail for the domain the machine is setup for, is there a simple way to disable local delivery? The domain is not in the local-host-names file. I've already done lots of googling and I have looked at: http://serverfault.com/questions/26934/sendmail-configuration-to-not-deliver-mail-to-local-machine http://serverfault.com/questions/65365/disable-local-delivery-in-sendmail But either there is no answer or it is not suitable. I don't want to relay to another server, i just want it to send mail regardless of domain. To provide an example: I have two servers, one is the mail server at mail.example.com and a web server which is example.com, when I use the smtp service on the web server it currently routes mail to a local mailbox on example.com, but it should be going to mailboxes on mail.example.com Output of sendmail -bt returns: ADDRESS TEST MODE (ruleset 3 NOT automatically invoked) Enter 3,0 [email protected] canonify input: info @ example . com Canonify2 input: info Canonify2 returns: info canonify returns: info parse input: info Parse0 input: info Parse0 returns: info ParseLocal input: info ParseLocal returns: info Parse1 input: info Parse1 returns: $# local $: info parse returns: $# local $: info

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• Appcrash and possible malware

  - by Chris Lively

  First off, I'm running MS Intune Endpoint Protection. It is completely up to date. On 10/25 @ 11:53PM I came across a site that caused Intune to freak out: Microsoft Antimalware has detected malware or other potentially unwanted software. For more information please see the following: http://go.microsoft.com/fwlink/?linkid=37020&name=Trojan:Win64/Sirefef.B&threatid=2147646729 Name: Trojan:Win64/Sirefef.B ID: 2147646729 Severity: Severe Category: Trojan Path: file:_C:\Windows\System32\consrv.dll Detection Origin: Local machine Detection Type: Concrete Detection Source: Real-Time Protection User: NT AUTHORITY\SYSTEM Process Name: C:\Windows\explorer.exe Signature Version: AV: 1.115.526.0, AS: 1.115.526.0, NIS: 10.7.0.0 Engine Version: AM: 1.1.7801.0, NIS: 2.0.7707.0 I, of course, elected to simply delete the file. Since then my machine has been randomly giving an error about "Host Process for Windows Services" stopped working. There are generally two different pieces of info: Description Faulting Application Path: C:\Windows\System32\svchost.exe Problem signature Problem Event Name: BEX64 Application Name: svchost.exe Application Version: 6.1.7600.16385 Application Timestamp: 4a5bc3c1 Fault Module Name: StackHash_52d4 Fault Module Version: 0.0.0.0 Fault Module Timestamp: 00000000 Exception Offset: 000062bdabe00000 Exception Code: c0000005 Exception Data: 0000000000000008 OS Version: 6.1.7601.2.1.0.256.27 Locale ID: 1033 Additional Information 1: 52d4 Additional Information 2: 52d47b8b925663f9d6437d7892cdf21b Additional Information 3: ed24 Additional Information 4: ed24528f3b69e8539b5c5c2158896d3e and Description Faulting Application Path: C:\Windows\System32\svchost.exe Problem signature Problem Event Name: APPCRASH Application Name: svchost.exe Application Version: 6.1.7600.16385 Application Timestamp: 4a5bc3c1 Fault Module Name: mshtml.dll Fault Module Version: 9.0.8112.16437 Fault Module Timestamp: 4e5f1784 Exception Code: c0000005 Exception Offset: 00000000002ed3c2 OS Version: 6.1.7601.2.1.0.256.27 Locale ID: 1033 Additional Information 1: 3e9e Additional Information 2: 3e9e8b83f6a5f2a25451516023078a83 Additional Information 3: 432a Additional Information 4: 432a0284c502cce3bbb92a3bd555fe65 Intune claims the machine is clean. I've also tried some of the online scanners like trendmicro, all of which claimed the system is clean. Finally, I tried the "sfc /scannow" and it said all was good. I left my machine on after I left last night and there were about 50 of those messages. Ideas on how to proceed?

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• TFS 2010 : Unable to add Project to a collection

  - by Scott

  This morning I'm trying to setup Team Foundation Server 2010 to demo for my team. As this is just a demo, I thought I would install it on my Windows 7 machine which also serves as my development machine. My development machine uses Visual Studio 2008 Team Suite. I installed Team Explorer 2008 and then reapplied SP1. Finally I installed and setup TFS 2010. TFS by default gave me administrator privileges. I started up Visual Studios, and connected up to the Collection just fine. However, I'm unable to create a new project and get the follow error message: "TF30172: You are trying to create a team project either without required permissions or with an older version of team Explorer. Contact your project admin..." To check to permissions, I used my home computer which is running Visual Studio 2010. On this machine I was able to connect up to the same TFS instance and create a project no problem. So it looks as though it is a team explorer problem, but everywhere on the web people are saying not only am what I'm trying to do possible, but they have done it themselves. What am I missing to add a project to TFS 2010 under Visual Studio 2008?

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• Bridging Virtual Networking into Real LAN on a OpenNebula Cluster

  - by user101012

  I'm running Open Nebula with 1 Cluster Controller and 3 Nodes. I registered the nodes at the front-end controller and I can start an Ubuntu virtual machine on one of the nodes. However from my network I cannot ping the virtual machine. I am not quite sure if I have set up the virtual machine correctly. The Nodes all have a br0 interfaces which is bridged with eth0. The IP Address is in the 192.168.1.x range. The Template file I used for the vmnet is: NAME = "VM LAN" TYPE = RANGED BRIDGE = br0 # Replace br0 with the bridge interface from the cluster nodes NETWORK_ADDRESS = 192.168.1.128 # Replace with corresponding IP address NETWORK_SIZE = 126 NETMASK = 255.255.255.0 GATEWAY = 192.168.1.1 NS = 192.168.1.1 However, I cannot reach any of the virtual machines even though sunstone says that the virtual machine is running and onevm list also states that the vm is running. It might be helpful to know that we are using KVM as a hypervisor and I am not quite sure if the virbr0 interface which was automatically created when installing KVM might be a problem.

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• SAN with iSCSI-Target Performance Horrendous

  - by Justin

  We have a poor man's SAN setup in a 1U Ubuntu server running iSCSI-Target with two 300GB drives in RAID-0. We then are using it for block level storage for virtual machines. The hypervisor is connected to the SAN via gigabit on a dedicated VLAN and interfaces. We only have a single virtual machine setup and doing some benchmarks. If we run hdparm -t /dev/sda1 from the virtual machine, we get 'ok' performance of 75MB/s from the virtual machine to the SAN. Then we basically compile a package with ./configure and make. Things start ok, but then all the sudden the load average on the SAN grows to 7+ and things slow down to a crawl. When we SSH into the SAN and run top, sure the load is 7+, but the CPU usage is basically nothing, also the server has 1.5GB of memory available. When we kill the compile on the virtual machine, slowly the LOAD on the SAN goes back to sub 1 figures. What in the world is causing this? How can we diagnosis this further? Here are two screenshot from the SAN during high load. 1> Output of iotop on the SAN: 2> Output of top on the SAN:

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• Move database from SQL Server 2012 to 2008

  - by Rich

  I have a database on a SQL Sever 2012 instance which I would like to copy to a 2008 server. The 2008 server cannot restore backups created by a 2012 server (I have tried). I cannot find any options in 2012 to create a 2008 compatible backup. Am I missing something? Is there an easy way to export the schema and data to a version-agnostic format which I can then import into 2008? The database does not use any 2012 specific features. It contains tables, data and stored procedures. Here is what I have tried so far: I tried "tasks" - "generate scripts" on the 2012 server, and I was able to generate the schema (including stored procedures) as a sql script. This didn't include any of the data, though. After creating that schema on my 2008 machine, I was able to open the "Export Data" wizard on the 2012 machine, and after configuring the 2012 as source machine and the 2008 as target machine, I was presented with a list of tables which I could copy. I selected all my tables (300+), and clicked through the wizard. Unfortunately it spends ages generating its scripts, then fails with errors like "Failure inserting into the read-only column 'FOO_ID'". I also tried the "Copy Database Wizard", which claimed to be able to copy "from 2000 or later to 2005 or later". It has two modes: 1) "detach and attach", which failed with error: Message: Index was outside the bounds of the array. StackTrace: at Microsoft.SqlServer.Management.Smo.PropertyBag.SetValue(Int32 index, Object value) ... at Microsoft.SqlServer.Management.Smo.DataFile.get_FileName() 2) SQL Management Object Method which failed with error "Cannot read property IsFileStream.This property is not available on SQL Server 7.0."

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• VMWare Converter - Remote Linux Install P2V

  - by Zed Said

  I am trying to get what I thought was an easy process working. Here is my situation. I have a remote linux server (running Debian) that I would like to turn into a VM so that I can do testing on it rather than the production server. I downloaded VMWare Converter. I went to the "convert machine" wizard, chose Powered-on machine, entered my remote machine details. Clicking next shows that it correctly connects to my remote linux box. Now, on the next screen, for Destination type, it enters "WMWare Infrastructure virtual machine", and I can't change this. This is where I am stuck. Why do I need another sever to convert with? Is this where my VM gets sent to? And why can't I just convert the VM and save it on the computer that I am running the converter program on? If I do have to use a vmware infrastructure destination, I am confused at what ESX is, why and how I use it. Any help with this process would be more than appreciated!

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• Cannot Change "Log on through Terminal Services" in Local Security Policy XP from Server 2008 GP

  - by Campo

  This is a mixed AD environment, Server 2003 R2 and 2008 R2 I have a 2003 AD R2 and a 2008 R2 AD. GPO is usually managed from the 2008 R2 machine. I have a RD Gateway on another server as well. I setup the CAP and RAP to allow a normal user to log on to the departments workstation. I also adjusted the GPO for that OU to allow Log on trhough Remote Desktop Gateway for the user group. This worked on my windows 7 workstation. But unfortunately the policy is a different name in XP "allow log on through Terminal Services" I can get through right into the machine but when the log on actually happens to the local machine i get the "Cannot log on interactively" error. This is set in (for the local machine) Secpol.msc Local Security Policy "user rights assignment" but is controlled by the GPO in Computer Configuration Policies Security Settings Local Policies "User Rights Assignment" Do I simply need to adjust the same setting on the same GPO but with a server 2003 GP editor? Feel like that could cause issues... Looking for some direction. Or if anyone has run into this issue yet. UPDATE Should this work? support.microsoft.com/kb/186529 Still seems like I will have the issue as the actual GP settings for Log on through Terminal Services is still different between Server 2008 R2 and 2003 R2.... Another Thought: Should I delete the GPO made for the department and remake it with the 2003 R2 server? I have no 2008 specific settings as the whole department runs XP other than myself. If that's a solution I will move my computer out of the department as a solution... Thoughts?

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• How do I improve my incremental-backup performance?

  - by Alistair Bell

  I'm currently using the traditional rsync+cp -al method to create incremental/snapshot backups of our server tree. The backups are going onto a pair of eight-disk towers connected to the backup machine (a Sandy Bridge machine with 16 GB of RAM, running CentOS 5.5) via four eSATA connections (four disks per connection). Each disk is a regular 2 TB disk, so we have 32 TB of disk space connected to the backup machine. We're backing up about 20 TB of data on the servers with this. The problem is that each daily backup is taking more than 24 hours, and the real time-killer isn't the actual rsync, but the time it takes to perform a cp -al of the tree locally on the backup machine. It's taking more than 12 hours just to make the shadow copy of the tree, and as far as I can tell the performance backlog is at the disk (top shows the cp using a lot of RAM but not a lot of CPU and mostly in uninterruptible-sleep state) We have the server data split into four major volumes (and a few minor ones), and each of these backups runs in parallel (with some offsets in the cron to try to get some disks' cp done first). There are two volumes on the backup drive, both striped LVM volumes of 16 TB each. So obviously I need to improve the performance because it's unusable as it stands. The first question is: when CentOS 6 comes out, with support for btrfs, will making snapshots of subvolumes with btrfs substantially increase this performance? The second is: is there a way, with ext3 or something else supported in CentOS 5 or 6, to 'encourage' it to put the directories/inodes in one part of a volume (which could happen to be the part that's on an SSD, via LVM) and the files in another? That would presumably solve the problem, but I don't know of ways to hint ext3 like that.

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• "chown mysql:mysql /data/tmp" command

  - by Mellon

  I am on a Linux ubuntu machine with MySQL installed. If there is a MySQL installation on a Ubuntu machine, I saw some people doing the following thing: sudo chown mysql:mysql /data/tmp I get confused, I know the meaning of the above command, which is to change the owner of /data/tmp to user 'mysql' and change the group of it to 'mysql' group. But (my questions): 1. Why would one run the above command? If I create a table in my_db database, by default, there will be .frm, .MYD, and .MYI files (data files) be created automatically by MySQL under /var/lib/mysql/my_db/ . So, does the above command changes the default MySQL data directory to /data/tmp/ instead of /var/lib/mysql/my_db/? Basically, I would like to know the purpose and effect of the above command. (better with examples) 2. Where does the 'mysql' owner and group come from? Does the installation of MySQL on a Linux machine automatically create the 'mysql' user and group? or People need to manually create a mysql account for the linux machine?

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