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• How to remotely install Linux via SSH?

  - by netvope

  I need to remotely install Ubuntu Server 10.04 (x86) on a server currently running RHEL 3.4 (x86). I'll have to be very careful because no one can press the restart button for me if anything goes wrong. Have you ever remotely installed Linux? Which way would you recommend? Any advice for things to watch out? Update: Thanks for your help. I managed to "change the tires while driving"! The main components of my method are drawn from HOWTO - Install Debian Onto a Remote Linux System, grub legacy: Booting once-only, grub single boot and kernel panic reboot , and Ubuntu Community Documentation: InstallationFromKnoppix Here is the outline of what I did: Run debootstrap on an existing Ubuntu server Transfer the files to the swap partition of the RHEL 3.4 server Boot into tha swap partition (the debootstrap system) Transfer the files to the original root partition Boot into the new Ubuntu system and finish up the installation with tasksel, apt-get, etc I tested the method in a VM and then applied to the server. I was lucky enough that everything went smoothly :)

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• How to collaborate on features using github

  - by Robert Dailey

  github encourages 1 fork per user, so that that user can work independently on a feature and then request that feature to be accepted into the main repository via pull request. However, what if 2 developers need to collaborate on that feature? What is the ideal workflow for this? I could see a number of options: Both developers fork the original repository. Each developer pulls/pushes changes between each other's repository. This seems like a lot of work (tiny micro operations) and also creates a delay between changes, so increases the window for conflicts. Developer 1 forks from the main repository, developer 2 forks from developer 1. Same as #1 mainly but hopefully simplifies Developer 2's life a little? Developer 1 gives Developer 2 permissions to his own fork, so they both work out of the same central repository. Not sure if this is ideal. I'm also curious where branches come into this. Obviously there would be a branch for the feature itself but that branch can't exist in a single place, it would have to exist on multiple forks and be synchronized. Basically just really confused about this workflow, would like an approach for how this can be best accomplished.

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• Student Life in Nigeria

  - by FelixWehmeyer

  They say that the Nigerian way of life involves being able and ready to succeed in life no matter the obstacles. My name is Olawale Obasola, graduated from Covenant University ’07 and presently working as a graduate consultant in Oracle. I will give you an insight into the student life in Nigeria. Nowadays, being a graduate in Nigeria is not the easiest thing; the life after graduation is much harder than one would normally imagine. I guess it isn’t helped with the Economical uproar of the last few years but it’s as grueling as it can get.  Also the Upper vs Lower class phenomena makes the journey a little too much hurried as it is easier to lose one’s way. Joining Oracle is a dream come-true as it further enhances my stance of taking Technology to the core of Nigeria. My initial perception about joining Oracle is that am going to be monitored every single second and my life would practically revolve around work but ever since I stepped in here, it has been an amazing experience. As much as the work can be stressful at times, it’s also the best place I have ever worked in and the atmosphere is great. My team is the best Pre-Sales team in the region and I gain invaluable knowledge every minute, we have a bond and understanding that helps propel each other to achieve more. The Life of a Nigerian graduate isn’t a bed of roses but I have a strong will and personality to emerge from any hardship to succeed. We show the true strength and spirit of Africa, we never give up and would never settle for anything less than the best.

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• Strategy for hosting 700+ domains names, each with a static HTML site

  - by jonschlinkert

  I have a portfolio of more than 700 domain names, and ideally I'd like to put up a single-page HTML/CSS/JavaScript webpage for each domain. Is there a system/strategy/workflow that will allow me to: Automate the deployment of new websites, quickly and easily without having to manually initiate each new website in an admin panel. For instance, I've seen dropbox-based solutions that claim to make it simple to setup new websites on your dropbox account, but you still have to set each one up in an admin interface first. It would be so much easier to have a folder naming convention that allowed the user to easily clone/copy/duplicate sites inside their Dropbox App folder (https://www.dropbox.com/developers/blog/23) to create new ones. Sounds interesting, however... It's easy to manage CNAMEs on the registrar-side, but is there a way to quickly associate CNAMEs with new websites (on the hosting side), maybe using the method offered by gh-pages-style (https://help.github.com/articles/setting-up-a-custom-domain-with-pages)? With GitHub's gh-pages, all you have to do is drop a file called CNAME into your repo, with the domain name you want associated with the repo inside the file. gh-pages isn't a good solution for what I'm doing though unfortunately. I'm also a front-end developer, specializing in rapid web development and "front-end build systems", so I building and maintaining static assets for hundreds of sites is no problem. It's the hosting-side that I really struggle with. Any suggestions?

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• String Conversion to Char for Java Game

  - by Jen

  Is there someone who could help me achieve the following points on this problems? I can't seem to get it. I tried using toCharArray and Scanner to achieve this, but it doesn't work, nor do I know how to make this things possible for my word game. :( · Get a popular name of person, place, verse, saying or event from the user. This may have a single or multiple words in it. · Create a copy of this string to an array where each letter is replaced with a hyphen (-) and each space is replaced with an underscore (_). Symbols and numbers will remain shown. · The program then asks a letter from the user. If the letter is in the inputted string, then it should be shown on the array at the same position it is shown in the string. Meaning, the letter replaces the hyphen (-) at the correct position of the array. · The program again prompts for a letter from the user and replaces the hyphen (-) of the array if it exists on the inputted string. This will be repeatedly done until such time each hyphen (-) is replaced with the correct letter. · If the user inputs an invalid letter, that is, a letter that does not exist on the inputted string, then the program should inform the user. If this happens 3 times while there is still at least one hyphen on the array, then the program should inform the user that he lost the game and showing him the whole correct string. · If the user completes the game, meaning, all hyphens have been replaced with the correct letters; then the program should congratulate the user for a job well done.

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• Reflective discovery of an inner class in an API

  - by wassup

  Let me ask you, as this bothers me for quite a while but appears to be subjectively the best solution for my problem, if reflective discovery of an inner class for API purposes is that bad idea? First, let me explain what I mean by saying "reflective discovery" and all that stuff. I am sketching an API for a Java database system, that'll be centered around block-based entities (don't ask me what that means - that's a long story), and those entities can be read and returned to the Java code as objects subclassed from the Entity class. I have an Entity.Factory class, that, by means of fluent interfaces, takes a Class<? extends Entity> argument and then, uses an instance of Section.Builder, Property.Builder, or whatever builder the entity has, to put it into the back-end storage. The idea about registering all entity types and their builders just doesn't appeal to me, so I thought that the closest solution to the problem that'd suffice my design needs would be to discover, using reflection, all inner classes of Entity classes and find one that's called Builder. Looking for some expert insight :) And if I missed some important design details (which could happen as I tried to make this question as concise as possible), just tell me and I'll add them.

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• Reporting memory usage per process/program

  - by Nick Retallack

  How can I get the current memory usage (preferably in bytes so they can be added up accurately) for all running processes individually? Can I roll up the summaries for child processes into the process that spawned them? (e.g all apache threads together). Sometimes, my server runs out of memory and becomes unresponsive. I want to discover what is using up all the memory. Unfortunately, it's likely to not be a single process. Some programs spawn hundreds of processes, each using very little memory, but it adds up. On a side note, is it normal for apache to spawn 200+ processes?

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• two-part dice pool mechanic

  - by bythenumbers

  I'm working on a dice mechanic/resolution system based off of the Ghost/Echo (hereafter shortened to G/E) tabletop RPG. Specifically, since G/E can be a little harsh with dealing out consequences and failure, I was hoping to soften the system and add a little more player control, as well as offer the chance for players to evolve their characters into something unique, right from creation. So, here's the mechanic: Players roll 2d12 against the two statistics for their character (each is a number from 2-11, and may be rolled above or below depending on the nature of the action attempted, rolling your stat exactly always fails). Depending on the success for that roll, they add dice to the pool rolled for a modified G/E style action. The acting player gets two dice anyhow, and I am debating offering a bonus die for each success, or a single bonus die for succeeding on both of the statistic-compared rolls. One the size of the dice pool is set, the entire pool is rolled, and the players are allowed to assign rolled dice to a goal and a danger. Assigned results are judged as follows: 1-4 means the attempted goal fails, or the danger comes true. 5-8 is a partial success at the goal, or partially avoiding the danger. 9-12 means the goal is achieved, or the danger avoided. My concerns are twofold: Firstly, that the two-stage action is too complicated, with two rolls to judge separately before anything can happen. Secondly, that the statistics involved go too far in softening the game. I've run some basic simulations, and the approximate statistics follow: 2 dice (up to) 3 dice (up to) 4 dice failure ~33% ~25% ~20% partial ~33% ~35% ~35% success ~33% ~40% ~45% I'd appreciate any advice that addresses my concerns or offers to refine my simulation (right now the first roll is statistically modeled as sign(1d12-1d12), where 0 is a success).

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• Parsing an header with two different version [ID3] avoiding code duplication?

  - by user66141

  I really hope you could give me some interesting viewpoints for my situation, my ways to approach my issue are not to my liking . I am writing an mp3 parser , starting with an ID3v2 parser . Right now I`m working on the extended header parsing , my issue is that the optional header is defined differently in version 2.3 and 2.4 of the tag . The 2.3 version optional header is defined as follows : struct ID3_3_EXTENDED_HEADER{ DWORD dwExtHeaderSize; //Extended header size (either 6 or 8 bytes , excluded) WORD wExtFlags; //Extended header flags DWORD dwSizeOfPadding; //Size of padding (size of the tag excluding the frames and headers) }; While the 2.4 version is defined : struct ID3_4_EXTENDED_HEADER{ DWORD dwExtHeaderSize; //Extended header size (synchsafe int) BYTE bNumberOfFlagBytes; //Number of flag bytes BYTE bFlags; //Flags }; How could I parse the header while minimizing code duplication ? Using two different functions to parse each version sounds less great , using a single function with a different flow for each occasion is similar , any good practices for this kind of issues ? any tips for avoiding code duplication ? anything would be great .

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• Object construction design

  - by James

  I recently started to use c# to interface with a database, and there was one part of the process that appeared odd to me. When creating a SqlCommand, the method I was lead to took the form: SqlCommand myCommand = new SqlCommand("Command String", myConnection); Coming from a Java background, I was expecting something more similar to SqlCommand myCommand = myConnection.createCommand("Command String"); I am asking, in terms of design, what is the difference between the two? The phrase "single responsibility" has been used to suggest that a connection should not be responsible for creating SqlCommands, but I would also say that, in my mind, the difference between the two is partly a mental one of the difference between a connection executing a command and a command acting on a connection, the latter of which seems less like what I have been lead to believe OOP should be. There is also a part of me wondering if the two should be completely separate, and should only come together in some sort of connection.execute(command) method. Can anyone help clear up these differences? Are any of these methods "more correct" than the others from an OO point of view? (P.S. the fact that c# is used is completely irrelevant. It just highlighted to me that different approaches were used)

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• Emacs eshell over SSH not obeying key commands or elisp

  - by Brad Wright

  When SSHing to a remote server Eshell doesn't behave very well, e.g: M-x eshell ssh server <tab> *inserts literal tab instead of trying to complete* Hitting <tab>, for instance, inserts a literal tab. Is there no way to get tab completion, lisp interaction (like find-file blah) etc. over SSH? All the documentation I've read says Eshell is "TRAMP-aware", which I assume meant it could deal with this. Am I just wrong in my assumption that it would work over SSH, or is something broken? This is on Emacs 24.0.94 pretest.

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• Any mobile-friendly Credit Card billing solutions for mobile sites similar to Bango?

  - by Programmer

  Are there any mobile-friendly Credit Card billing solutions for mobile sites similar to Bango? The advantages of Bango I have seen compared to regular Credit Card solutions that make it considerably "mobile-friendly" are: 1) It does not require the user to enter their full name and billing address to make a payment. The user is only required to enter their Credit Card number, expiration date, and CVC code (if they are in the U.S., they will also have to enter their Zip Code). That is significantly less input than is normally required for Credit Card payments, which is a big plus on small mobile key pads. After a user makes an initial Credit Card payment, their details are stored by Bango, and the next time the user needs to make a payment with the same Credit Card, they just have to click a single link and it processes the payment on their stored Credit Card. Needless to say, this is very convenient for mobile users as it is analogous to Direct Carrier Billing as far as the user is concerned since they won't need to input any details. The downside with Bango is that their fees are higher than others, all payments must be processed via their site and branding, there is a high minimum ($1.99) and a low maximum ($30) on how much you can charge users, and you need to pay a monthly fee on top of the high transaction costs. It is due to the downsides mentioned above that I am looking for an alternative solution that also does the advantages 1) and 2) above. Is there anything like that? I looked at JunglePay and they do neither 1) nor 2).

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• Q: MySQL Cluster - Data insertion in NDBCLUSTER table - error out after 5 million rows

  - by Mata

  MysqlCluster version: mysql-5.6.11 ndb-7.3.2 Insertload = 50 M dataset Datanodes = 3 LOAD DATA INFILE '/input_50m/Table_1_sorted.csv' IGNORE INTO TABLE nw_ndb FIELDS TERMINATED BY ',' LINES TERMINATED BY '\n' We recently setup a new mySQL cluster and trying to load data from a flat file. But getting error “Got temporary error 4010 'Node failure caused abort of transaction' from NDBCLUSTER" when inserting 5 million rows in a single table in MySQL Cluster. We are using "LOAD DATA INFILE" command to load the data in the table from csv file. Server (musqld, ndb nodes) has good hardware: 126 GB RAM, 32 Gb allocated to mysqld tried below settings with no effect: SET autocommit=0; SET FOREIGN_KEY_CHECKS=0; SET unique_checks=0; SET GLOBAL ndb_batch_size=8*1024*1024; SET GLOBAL ndb_cache_check_time = 1000; SET GLOBAL ndb_index_stat_cache_entries = 10000000; SET SESSION BULK_INSERT_BUFFER_SIZE=256217728; SET GLOBAL KEY_BUFFER_SIZE=256217728; Any clues?

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• What poor management decisions have you had to deal with?

  - by tombull89

  As a junior technician I've had to deal with (or will have to deal with) some problems in the past and only being a junior technician I don't have the confidence or respect from management staff to speak up. For instance, we're having a entirely new system. From Windows Server 2003/XP going to Windows Server 2008 R2/Windows 7/VMWare/Digital Signage and the current amount of time dedicated to the training of the IT support department currently stands at 0. They seem to think that all IT systems are the same and are going to get a bit of shock when I can't help them. I think there;s some UK legislation saying a school/business have to put money and time aside for training, but I'm not sure. What have you had to deal with?

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• Is it possible to get xRandR to see two separate outputs with the nvidia driver?

  - by rumtscho

  I have two monitors, which I have set up with nvidia-settings in Twinview. The result: When I want to do something in xRandR, it does not function. It doesn't report one output per video card head, but a single output mapped to the combined area of both monitors: rumtscho@bradbury:~$ xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 3840 x 1440, current 3840 x 1440, maximum 3840 x 1440 default connected 3840x1440+0+0 0mm x 0mm 3840x1440 50.0* Now I promised somebody to help test a driver. The developer is using an open source driver for Intel video cards, and his driver assumes that there is more than one xRandR output, each mapped to a monitor. So I tried rewriting my xorg.conf to somehow get two outputs to show up, but failed. Googling showed that people faced with the xRandR-nvidia problem either stopped using xRandR and achieved what they needed with nvidia-settings, or changed their driver to nouveau. The first is not going to help in my situation, and I am not willing to give up the proprietary driver, because Compiz won't work without it. So does anybody know a way to get nvidia to actually pass on information on outputs to xRandR?

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• StyleCop Custom Rules

  - by Aligned

  There are several blogs on how to do this (http://scottwhite.blogspot.com/2008/11/creating-custom-stylecop-rules-in-c.html, etc). I’ve found a few useful things to point out: Debugging is difficult, but here are the steps (thanks to Tintin’s answer). “One way: 1) Delete your custom rules 2) Open Visual Studio (for dev), open your custom rule solution 3) Build & Deploy custom rules (a PostBuild action to copy the rules into the StyleCop folder is handy) 4) Open Visual Studio (for test) 5) Use VS (dev) and Attach to process devenv.exe (the test VS instance), set breakpoints in the rules you want to debug 6) Use VS’ (test) and right-click on project, Run StyleCop 7) Debug” ~ it worked once, now I’m having problems getting it to work again ~ I also get the message “Cannot evaluate expression because the code of the current method is optimized.” when I try to look at properties. Looking at the source code of the StyleCop.CSharp.Rules.dll that comes with the install. I used JustDecompile from Telerik. Create one xml file and name it the same as the one cs file (CodingGuildelineRules.cs and CodingGuidelinRules.xml) Deploy: 1. Build in Visual Studio 2. Close Visual Studio (Style cop is running so you can’t override your dll without closing) 3. Copy the dll from the bin to the C: \Program Files (x86)\StyleCop 4.7\ 4. Open the settings file or re-open Visual Studio

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• How do I create DNS entries for EC2 instances created by Auto Scaling?

  - by Evan

  I'm looking into using auto scaling groups for a tier of webservers that would be fronted by an ELB. One of the things I'm having a hard time with is how to give each new instance the proper DNS name. For example, I'd like webservers to have names like frontend-web-XXX.prod.example.com so their names would appear correct in logs and just ease of organization. I have two other tiers I'd ultimately like to make autoscaled and I'd like them to have names like api-web-XXX.prod.example.com as well. I have some experience with cloudformation templates and have spun up individual instances with associated Route53 records but I don't see any indication of how this can be done within an autoscaled group.

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• OpenVPN client on Amazon EC2

  - by Matt Culbreth

  I have an account with an OpenVPN service, and I'd like to get that running on my EC2 instance running Ubuntu 12.04. I have my config file in /etc/openvpn, and it connects fine when I run sudo openvpn --config matt.ovpn. However, I then lose connectivity to the EC2 machine, and I can't SSH back to it until I reboot. Previously I have done things like sudo ip rule add from IP_ADDRESS table 10 and then sudo ip route add default via GATEWAY_IP table 10, but that's not working on EC2. Any ideas? My private IP address right now is 10.209.29.XXX and my gateway is 10.209.29.1.

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• How to configure HA iSCSI for Solaris 10

  - by Noah

  BACKGROUND: We have a StarWind NAS that we are currently using for High Availability storage with our Windows network. Starwind has mirrored drives and multiple ip paths, that the Windows Server combines into one HA disk store. QUESTION: How do I accomplish the same thing under Solaris 10? I've looked at ZFS but to document seems to indicate that ZFS wants to do its own raid/mirroring. I can also attach via iSCSI from Solaris and am presented with both drives being served by the Starwind NS. So, how do I configure solaris so that disk M1 and M2 are considered as a single fault tolerant drive?

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• IRC Services with failover support?

  - by insertjokehere

  I run a single server (call it 'server A') IRC 'network', and thank to the generosity of some friends, I have been given a second server ('server B') that I can run an IRCd on in order to provide redundancy in case server A crashes. This is fine, I can set up a round-robin DNS with the servers linked. The problem I have is what to do about services? Does anyone know of a way to get the services to 'fail over' in case of a server failure? Eg, Server A starts off running the services, but suddenly crashes. Server B detects this and starts its own copy of the services (ideally with the same configuration and data as the services on Server B) One solution that comes it mind is to write a bot that each server runs, that sit in a channel periodically checking if the bot from the other server is in the channel. If it is, then all is well. If not, then failover. I would prefer not to have to code this myself though We are currently using Unreal IRCd and Anope services on Linux

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• Unreasonably slow stunnel

  - by Kit Sunde

  I setup stunnel on OSX to tunnel traffic to my Django dev server because Facebook needs HTTPS these days but I noticed it's being absurdly slow. It seems like it can only handle a single connection at a time and even the connection is slow when I'm connecting to localhost. I've tried using some performance tips found online and so my config is setup as: pid= # foreground=yes cert=./cacert.pem key=./privkey.pem libwrap=no debug=0 socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 [https] accept=8443 connect=8000 Is there a way to get more performance or more suitable way of setting up HTTPS for my dev server?

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• How to know if my nginx is in good health?

  - by Howard

  I am running a nginx on EC2 (m1.small) for SSL termination. I am using 2 workers on Ubuntu, with latest nginx (stable), the network throughput is around 2Mbps and system load average is around 2 to 3. I am wondering if this system is in good health for now, e.g. what is the queue length (I know nginx can handle a lot of concurrent request, but I mean before the request is being served, how many of them need to wait before being served) what is the average queue time for a given request to be served. I want to know because if my nginx is cpu bounded (e.g. due to SSL), I will need to upgrade to a faster instance. My current nginx status Active connections: 4076 server accepts handled requests 90664283 90664283 104117012 Reading: 525 Writing: 81 Waiting: 3470

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• Avoid cache overflow in Atempo LiveBackup

  - by Vebjorn Ljosa

  When attempting the initial backup of a new client, Atempo LiveBackup seems to require a very large cache. For instance, a 20 GB cache is not enough to back up a computer that has 100 GB of data. It appears that LiveBackup is adding new files to the cache at a faster rate than it can send them to the server. When the cache fills up, the backup fails. Aside from removing most data from the computer and then add them back gradually after the initial backup, is there a good workaround? Is it possible to make LiveBackup slow down its scan so as to not fill the cache? Or is it possible to place the cache on an external drive?

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• Finding Buried Controls

  - by Bunch

  This post is pretty specific to an issue I had but still has some ideas that could be applied in other scenarios. The problem I had was updating a few buttons so their Text values could be set in the code behind which had a method to grab the proper value from an external source. This was so that if the application needed to be installed by a customer using a language other than English or needed a different notation for the button's Text they could simply update the database. Most of the time this was no big deal. However I had one instance where the button was part of a control, the button had no set ID and that control was only found in a dll. So there was no markup to edit for the Button. Also updating the dll was not an option so I had to make the best of what I had to work with. In the cs file for the aspx file with the control on it I added the Page_LoadComplete. The problem button was within a GridView so I added a foreach to go through each GridViewRow and find the button I needed. Since I did not have an ID to work with besides a random ctl00$main$DllControl$gvStuff$ctl03$ctl05 using the GridView's FindControl was out. I ended up looping through each GridViewRow, then if a RowState equaled Edit loop through the Cells, each control in the Cell and check each control to see if it held a Panel that contained the button. If the control was a Panel I could then loop through the controls in the Panel, find the Button that had text of "Update" (that was the hard coded part) and change it using the method to return the proper value from the database. if (rowState.Contains("Edit")){  foreach (DataControlFieldCell rowCell in gvr.Cells)  {   foreach (Control ctrl in rowCell.Controls)   {    if (ctrl.GetType() == typeof(Panel))     {     foreach (Control childCtrl in ctrl.Controls)     {      if (childCtrl.GetType() == typeof(Button))      {       Button update = (Button)childCtrl;       if (update.Text == "Update")       {        update.Text = method to return the external value for the button's text;       }      }     }    }   }  }} Tags: ASP.Net, CSharp

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• Why do we still have to use drive letters to identify file systems?

  - by Charles E. Grant

  A friend has run into a problem where they installed Windows 7 from an external drive, and the internal boot drive is now assigned to H:. Theoretically this shouldn't cause problems because there are programming interfaces for getting the drive letter for the system drive. In practice though, there are quite a few programs that assume that C: is the only possible location for the system directories, and they refuse to run with the system directories on H:. That's not Microsoft's fault, but it's a pain none-the-less. The general consensus seems to be that a re-install, setting the internal boot drive to C:, is the only way to avoid fix these problems. UNIX-like systems display all file systems in a single unified directory tree and mostly seem to avoid problems like this. Is it possible to configure a Windows system without reference to drive letters, or does the importance of backwards compatibility mean that Windows will be working with drive letters from now until doomsday?

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