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• What are the pros & cons of these MySQL engines for OLTP -- XtraDB, PBXT, or TokuDB?

  - by Continuation

  I'm working on a social website with an approximate read/write split of 90/10. Trying to decide on a MySQL engine. The ones I'm interested in are: XtraDB PBXT TokuDB What are the pros and cons of them for my use case? A few specific questions: PBXT uses log-based structure that avoids double-writes. It sounds very elegant, but the benchmark I've seen doesn't show any/much advantages over XtraDB. Do you have any experience with PBXT/XtraDB you can share? TokuDB sounds VERY interesting. But all the benchmarks I've seen are about single-threaded bulk inserts - inserting 100M rows for example. that's not very relevant for OLTP. What about its performance with large number of concurrent threads writing and reading at the same time? Anyone has tried that?

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• Imap subfolders not shown in list command - perhaps acls misconfiguration

  - by mschenk74

  My goal is to copy the whole folder structure with all mails from one imap account to another. The tool I am using for this is imapcopy (the java based version from code.google.com since the unix/linux tool packaged with debian doesn't support imaps). Now, there is one problem: The tool only copies the top-level folders and not the nested ones. To narrow down the problem I have downloaded the source code of imapcopy and debugged into the code. There I noticed that the folder.list() (which is mapped to the list "%" imap command) returns an empty list. But when I do a getFolder(<subfoldername>) I can access those subfolders. After reading some documentation about the features of imap I think that the problem might be some misconfigured ACLs which prohibit the listing of those folders but allow to read ad write to them. How should I check this ACLs? which tools do I need for this task?

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• Redirect URL to a Tomcat webapp

  - by phs

  I have a Tomcat server with two webapps, app1 and app2 (the app part is really the same). Each app has an independent group of users. I would like the groups to be able to access their respective app using group1.domain.com/app and group2.domain.com/app URLs, meaning that the numbers should be hidden from the URL displayed in browser. I suppose there needs to be a mechanism that would return the correct app based on the group# part of the URL. I have a vague understanding of URL rewrites. Is there a way to do this with only Tomcat? Or do I need Apache HTTP server? I would rather not use Apache if possible, but have no problem going that way if necessary.

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• "Access is denied" when copying text file to printer UNC path

  - by Patrick

  We have a new server running Server 2008 R2. We also have a "DOS-based" program that prints directly to the UNC path of a print share. With the new server, we are unable to print from this program. According to support, the program's printing works in the same way as if we were to do a "copy mytextfile.txt \\myserver\myprinter". When we try to run this command in DOS, we get "Access is denied". Support is saying that this is why the DOS program is not able to print. I have tried granting all permissions on the printer to the appropriate users (under Security of the printer properties) but that did not work. Is there a policy setting that would cause this to be denied?

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• Nginx works on my linux machine but is not accessible from other computers in my local network

  - by crooveck

  In my LAN network I have a server with Scientific Linux (RedHat or Fedora based distro), I've done yum install nginx but the welcome page is not accessible from other computers in my network. When I do telnet open localhost 80 and then GET / HTTP/1.0 I get some html code from nginx, so it's running for sure. But when I want to connect remotly, doing telnet open 192.168.3.130 80 I get: Trying 192.168.3.130... telnet: Unable to connect to remote host: No route to host So I assume that there is something wrong with my network settings, maybe iptables or something else? Next step, I turned off iptables: service iptables stop and it helped, now I can connect remotely using telnet. So I think, I need to fix my iptables rules. I did some googling and found this rule -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT but it still didn't allow me to connect remotely when iptables is up. Can someone please help me setting a proper iptables configuration?

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• Programmatically closing a dialog box - win32 [migrated]

  - by user1697579

  I'm working on an application to detect a pop-up dialog and then automatically dismiss it. I'm writing this as a C++/Win32 app. The dialog box is generated by IE 7 and I can detect the window, but several methods to get the OK button to "click" have failed. Doing searches for other people's solutions, sending these messages to the button handle seems to have worked in a lot of situations: PostMessage( handle, WM_LBUTTONDOWN, 0, 0 ); PostMessage( handle, WM_LBUTTONUP, 0, 0 ); PostMessage( handle, BM_SETSTATE, 1, 0 ); It has no effect on the button state in my tests though. I can send tab characters to the main window and see that the OK button gets focus, but then sending return characters does nothing. To learn more about this I used Spy++ to get information about the window hierarchy and what messages are delievered when I manually click the OK button. Looking at the message log and reading about WM_MOUSEACTIVATE seamed to offer a solution. The log info shows that 0002166C was the button window. So in my code I tried this: GetClassNameA( handle, str, str_size ); if( strcmp( str, "Internet Explorer_Server" ) != 0 ) return TRUE; // Not the window we're interested in. // Send a message to activate the button window and have it process a mouse click. PostMessage( handle, WM_MOUSEACTIVATE, (WPARAM) dialog_handle, MAKELPARAM( HTCLIENT, WM_LBUTTONDOWN ); Based on the window hierarchy and message log, I think the window with the class name "Internet Explorer_Server" is the button. Maybe I'm wrong, because it does seem like an odd class name for a button... Below is a link to the window hierarchy image, message log when I manually click the OK button. Last is the code that's executed on a 1 second timer ticket, looking for the window. Any insight and help is appreciated! Image of the window hierarchy, source, window messages, and test dialog source are available here: https://sites.google.com/site/matthewmillersmiscellanea/Home/

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• Should I Open Source? [closed]

  - by Howdy_McGee

  My company recently created a full javascript, html & css Virtual Tour. Since it is html based there is no real way of securing our information/code so selling it could be flimsy. We are an extremely small company, barely on the map so I was thinking that by making this an open source project it could give us a chance to jump start our SEO by page views alone, especially if we provide documentation. Not to mention hopefully bring a community following on our blog. On the other hand though could this possibly hurt our sales as a web development company? If we are handing out this cool "plugin" we made what keeps people from making it commercial somehow? So I'm trying to weigh the options on whether I should make this Open Source or not and the pros / cons of each especially for a small business. What do you guys think about making things Open Source? How do I know if this product is the right thing to make Open Source? What are some pros and cons to going Open Source?

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• Book Recommendations for Technical/Solutions Architecture [closed]

  - by giant_squid

  I wish to learn more about Technical and Solutions Architecture. Specifically, I'm concerned with designing HA, Fault-Tolerant Scalable web-based solutions (enough buzzwords ;-). Its a topic I'm familiar with on a technical level having worked as a sysadmin, but I don't know all the buzzwords Architects use and have to brush up on my UML and diagram techniques. I would like a book that describes what architecture is as a discipline and explores standard design patterns, and some do's and don'ts. Do you have any recommendations? I apologise if this sounds vague, its because I am still learning what Architecture is as a discipline having come from a sysadmin background. To be 100% clear I'm looking for books or websites that give broad overviews of what System Design patterns exist and how the discipline works. Thanks Instead of closing the question maybe you could comment on what exactly about it you don't like.

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• PPTP VPN Server issue : server = centOS & client = windows 7

  - by jmassic

  I have a CentOS server configured as a PPTP VPN Server. The client is a Windows 7 with "Use default gateway on remote network" in advanced TCP/IPv4 properties enable. He can connect to CentOS without any problem and can access to: The Box of his ISP (http://192.168.1.254/) The CentOS server The website which is hosted by the server (through http://) But he canNOT access any other web service (google.com or 74.125.230.224) I am a beginner with web servers so I do not know what can cause this problem. Note 0 : The Windows 7 user must be able to access the whole internet through the CentOS PPTP proxy. Note 1 : With "Use default gateway on remote network" in advanced TCP/IPv4 UNCHECKED it is the same problem Note 2 : With "Use default gateway on remote network" in advanced TCP/IPv4 UNCHECKED AND "disable class based route addition" CHECKED the Win 7 can access google but with the ISP IP (no use of the VPN...) See Screenshot Note 3 : I have made a echo 1 > /proc/sys/net/ipv4/ip_forward and a iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE

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• need help setting up a VPN for remote computer connection

  - by Chowdan

  I am on a low budget right now. I am currently in the process of starting a computer company. I am in need of a VPN network so I can run Dameware tools for working on customers/partners computers remotely. I will be working with Windows and some Apple and linux machines. I have desktop with an AMD Phenom II 965BE(currently running stable at 3.8Ghz) processor with 8 GB of ram and a radeon hd 6870(i know graphics aren't too useful) and about 1.5TB of HDD space. I am attempting to create a network out of my office based all on one machine that would also be secure for me to remotely connect to my partners computers so when they have issues I would be able to connect and do the diagnosing and repairs remotely. What types of servers besides a VPN server would i need to create this? I have access to all Microsoft products so I can run Windows Server 2012, Windows Server 2008 R2, or any other Microsoft Software. thanks for the help all

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• How can I push a git repository to a folder over SSH?

  - by Rich

  I have a folder called my-project inside which I've done git init, git commit -a, etc. Now I want to push it to an empty folder at /mnt/foo/bar on a remote server. How can I do this? I did try, based on what I'd read: cd my-project git remote add origin ssh://user@host/mnt/foo/bar/my-project.git git push origin master which didn't seem right (I'd assume source would come before destination) and it failed: fatal: '/mnt/boxee/git/midwinter-physiotherapy.git' does not appear to be a git repository fatal: The remote end hung up unexpectedly I'd like this to work such that I don't have to access the remote host and manually init a git repository every time ... do I have to do that? Am I going down the right route at all? Thanks.

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• linux - Is Debian "lighter" than Ubuntu?

  - by user2983756

  I currently run Linux Mint 14 KDE on a "semi-old" machine I use for working and surfing the web - it was the first Linux system I ever used (running away from old Win XP), so I picked a complete system that would have most of my basic needs installed (I didn't even know what exactly all those needs were at the time). The thing is, my computer is becoming really old and Mint is a cluttered system, and for the next installation I'm going to try and install a "raw" system and get everything from the online repos. My question is: Since Ubuntu is Debian-based, does that make it consume more resources than its base system? If that isn't the difference, which one is "lighter" in that sense?

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• CentOS drive mapping? [on hold]

  - by DroidOS

  This is the first time I am posting on this particular StackExchange forum and I hope that I am using the right one for the present question. Briefly, this is what I need to do I am running a web service where users can, amongst other things, upload and store files on the server. What I want to do is to hive off user file storage to a different location so my server (CentOS 64 bit) can concentrate on what it does best - server side scripting and database management. As things stand all user files go into subdirectories in a folder called stash that lies above DOC_ROOT. What I would like to do is Transparently detect all attempts to read/write to stash/sub_folder and get/set file data on a remote server - ideally the latter would be one which replicates files like a CDN so they can be delivered from the closest/fastest location based on where the user's location. Even nicer would be if for all read accesses I could provide a URL that allows the user's browser to fetch the relevant file directly without having to funnel them via my server. I am a relative newbie when it comes to this sort of thing so I hope that I have phrased this question adequately well. From the little searching I done I gathered that WebDAV can be used to map drives to a different location on the web so perhaps that is a starting point. But if that will work I need to Establish how to get WebDAV up and running on my CentOS 64 bit server. Ideally, identify a service that allows this kind of file storage and provides an API I can use in my own scripting. I'd much appreciate any help with this.

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• File report ignoring NTFS permissions

  - by Edulin

  I need to inventory based on file age a huge NAS. Some folders are restricted, and only users or groups have rights. As you probably know Treesize is the best solution, the only problem I found is that if I want to script it it only takes a screenshot instead of writing the information to a text file. (If done through the GUI I'm allowed to copy/paste into text, but I need to script it, several shares). Robocopy /l lists the files but I also need to know the dates (last access / last modify) I saw a kernel driver by hobeanu to bypass ntfs permissions. But do you know any easier way to bypass ntfs permissions? or any other application that allows this type of request and save the information to a text file. (scriptable) Thanks

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• In-House DropBox

  - by beardedlinuxgeek

  Dropbox is perfect, but as a company, no one can host anything worthwhile on servers that we don't control. So I've been tasked with coming up with a Dropbox alternative, something in house. GlusterFS is nice, but no offline access. SparkleShare uses Git which isn't great for large files. It also doesn't have windows ports. Any other options? If I were to roll out my own from scratch, what do you think the based way to go about doing this would be?

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• Any Microsoft SQL Server 2008 licensing restrictions on usage?

  - by ryrobes

  Does Microsoft have any problems with HOW I USE SQL Server Standard Edition 2008? I plan on using it to aggregate my clients various data sources and report on them (using the whole stack - SSIS, DB, Analysis Services and Reporting Services) via the web. I don't want to run into any issues with being accused of "re-selling" services / features when I'm not allowed to, etc. In essence, I'm charging people to build them solutions based on / using MY licensed copy and then giving them access to the final products. (reports, etc) It seems straightforward enough - but who knows with MS... (BTW, Licensed by processor / not CAL)

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• phpmyadmin error #2002 cannot connect to mysql server

  - by Joe

  I am getting the error in the title when trying to connect to my MySQL server. I have reinstalled MySQL and PHP several times and tried a slew of command line work based on information I searched out. web.mysql is running and I know that my mysql.sock exists and is located in ~/private/tmp/ and also in ~/tmp/. I also have plenty of hard drive space. I have installed and setup phpMyAdmin correctly only adding a password to 'Password for config auth'. I have also connected to the server via Sequel Pro. Why can't I connect to the server via phpMyAdmin? I'm on a 64-bit Intel Mac running Snow Leopard

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• How can we add arch specific conflicts tag when building .deb package?

  - by Sphopale

  We are trying to build multi-arch supported i386 .deb package. There are two .deb packages build on i386 X1 & X2 (X2 is a subset of X1 binaries). X1 <- X2 conflict each other when installing . Only one .deb package can be installed at any instance. We similarly have binaries on xa64 arch. Again on xa64, there are two .deb packages X1 & X2 (X2 is a subset of X1 binaries). X1 <- X2 conflict each other when installing . Only one .deb package can be installed at any instance. In case of multi-arch i386 .deb package,i386 .deb packages (X1 & X2) can be installed on xa64 along side with 64bit (X1 & X2) However I see that when installing X1:i386 & X1:amd64 can co-exist However, it throws conflict error when trying to install X1:i386 & X2:amd64 In short, Can we mark package to conflict based on arch Conflict: X2:i386 X1:i386 package should only conflict with X2:i386 & allow other packages to co-exist X1:amd64 package should only conflict with X2:amd64 & allow other packages to co-exist X1:i386 can co-exist with X1:amd64 OR X2:amd64 X2:i386 can co-exist with X1:amd64 OR X2:amd64 Thanks for your reply

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• Is it possible to get the matched regex from within the apache LocationMatch directive?

  - by tftd

  I'm wondering if the following code should be working: <LocationMatch "/(.*)([/])?(.*)"> Order allow,deny Allow from all AuthType Basic AuthName "Git" AuthUserFile /git/.htpasswd AuthGroupFile /git/.htgroup Require group $1 </LocationMatch> What I am trying to achieve with this is to require a group based on the first regex variable. So if the user goes to http://localhost/a-repository-name he has to be in the group a-repository-name to be able to open the url. For some reason I can't get this code working and apache returns: Authorization of user **** to access /a-repository-name failed, reason: user is not part of the 'require'ed group(s). I guess it's not matching against the proper variable at Require group $1. Is this the right way to be done or I'm missing something?

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• Simplest way to respawn configured number of instances of a specific process.

  - by Zwei Steinen

  So we have an app. which we wan to run multiple instance of it in linux. The number should be configurable. We also want that whenever one of the instance disappears, a new one is booted up. I was looking into C based programs, shell script, python script etc. but I was wondering what would be the most simple, easiest way to do it. Are there any tools out there? Can one simply use some linux built-in functionality? Linux distribution is Red Hat.

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• Google maps later traffic

  - by bobobobo

  Google maps has this feature of showing you how long it will take to get somewhere based on current traffic. But what about history, or asking for a prediction of how long it will take to get somewhere, during rush hour, for example? So, how long will it take to get there on this route if I leave at 5, vs how long it will take if I leave at 3. (A difference of 30 minutes on the road sometimes!) If google maps doesn't provide this service, iis there anywhere that does?

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• remove "items 1-9 of X" from google result

  - by OSdave

  the results of my Magento based website's categories includes "items 1 - 9 of X" before the actual description of the category. How can I get rid of this? In this snapshot, what I want to delete is the red rectangle edits: @Su, these are the reason: Having text like (Items 1 - 9 of 144 –) appear in a Google listing uses up the 25 word limit that Google allows us. More importantly, the first few words of the description can persuade or dissuade someone from visiting my site. This text will not positively influence people to visit my site. @DisgruntledGoat this information shows up in the source code of that page, like this: <table class="toolbar" border="0"> <tr> <td class="pager" style="width: 414px;"> <table class="pager" cellspacing="0"> <tr> <td>Items 1 to 9 of 144 total</td> </tr> </table> </td> </tr> </table>

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• Representing a world in memory

  - by user9993

  I'm attempting to write a chunk based map system for a game, where as the player moves around chunks are loaded/unloaded, so that the program doesn't run out of memory by having the whole map in memory. I have this part mostly working, however I've hit a wall regarding how to represent the contents of each chunk in memory because of my so far limited understanding of OOP languages. The design I have currently has a ChunkManager class that uses a .NET List type to store instances of Chunk classes. The "chunks" consist of "blocks". It's similar to a Minecraft style game. Inside the Chunk classes, I have some information such as the chunk's X/Y coordinate etc, and I also have a three dimensional array of Block objects. (Three dimensional because I need XYZ values) Here's the problem: The Block class has some basic properties, and I had planned on making different types of blocks inherit from this "base" class. So for example, I would have "StoneBlock", "WaterBlock" etc. So because I have blocks of many different types, I don't know how I would create an array with different object types in each cell. This is how I currently have the three dimensional array declared in my Chunk class: private Block[][][] ArrayOfBlocks; But obviously this will only accept Block objects, not any of the other classes that inherit from Block. How would I go about creating this? Or am I doing it completely wrong and there's a better way?

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• Get SMTP to work

  - by user664408

  We upgraded to exchange 2010 and this broke an old java based script that connected and sent out e-mail messages. Many hours later we still can't get exchange to work like exchange 2003 did. That hope was abandoned and we decided to create a linux postfix server to forward the e-mail from the old system to exchange, eliminating exchange on the java side. This still doesn't work with similar errors. I need help figuring out what is different between exchange 2003 with SSL and authentication and the new servers, both linux and exchange 2010. My guess is both have TLS and for some reason the java code won't revert back to the older version of SSL, instead it just fails. Can someone help me either setup exchange 2010 to work like 2003 used to, OR to setup postfix to mandate it use SSL 2.0 instead of TLS? unfortunately no one knows anything about the Java code and they can't decompile it apparently. Any help is appreciated.

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• Linux/Solaris replace hostnames in files according to hostname rule

  - by yael

  According to the following Perl command ( this command part of ksh script ) I can replaced old hostnames with new hostnames in Linux or Solaris previos_machine_name=linux1a new_machine_name=Red_Hat_linux1a export previos_machine_name export new_machine_name . perl -i -pe 'next if /^ *#/; s/(\b|[[:^alnum:]])$ENV{previos_machine_name}(\b|[[:^alnum:]])/$1$ENV{new_machine_name}$2/g' file EXPLAIN: according to perl command - we not replaces hostnames on the follwoing case: RULE: [NUMBERS]||[letter]HOSTNAME[NUMBERS]||[letter] my question after I used the Perl command in order to replace all old hostnames with new hostnames based on the "RULE" in the Perl command how to verify that the old hostnames not exist in file ? for example previos_machine_name=linux1a new_machine_name=Red_Hat_linux1a more file AAARed_Hat_linux1a verification should be ignore from this line @Red_Hat_linux1a$ verification should be match this line P=Red_Hat_linux1a verification should be match this line XXXRed_Hat_linux1aZZZ verification should be ignore from this line . . . .

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