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• Learn programming backwards, or "so I failed the FizzBuzz test. Now what?"

  - by moraleida

  A Little Background I'm 28 today, and I've never had any formal training in software development, but I do have two higher education degrees equivalent to a B.A in Public Relations and an Executive MBA focused on Project Management. I've worked on those fields for about 6 years total an then, 2,5 years ago I quit/lost my job and decided to shift directions. After a month thinking things through I decided to start freelancing developing small websites in WordPress. I self-learned my way into it and today I can say I run a humble but successful career developing themes and plugins from scratch for my clients - mostly agencies outsourcing some of their dev work for medium/large websites. But sometimes I just feel that not having studied enough math, or not having a formal understanding of things really holds me behind when I have to compete or work with more experienced developers. I'm constantly looking for ways to learn more but I seem to lack the basics. Unfortunately, spending 4 more years in Computer Science is not an option right now, so I'm trying to learn all I can from books and online resources. This method is never going to have NASA employ me but I really don't care right now. My goal is to first pass the bar and to be able to call myself a real programmer. I'm currently spending my spare time studying Java For Programmers (to get a hold on a language everyone says is difficult/demanding), reading excerpts of Code Complete (to get hold of best practices) and also Code: The Hidden Language of Computer Hardware and Software (to grasp the inner workings of computers). TL;DR So, my current situation is this: I'm basically capable of writing any complete system in PHP (with the help of Google and a few books), integrating Ajax, SQL and whatnot, and maybe a little slower than an experienced dev would expect due to all the research involved. But I was stranded yesterday trying to figure out (not Google) a solution for the FizzBuzz test because I didn't have the if($n1 % $n2 == 0) method modulus operator memorized. What would you suggest as a good way to solve this dilemma? What subjects/books should I study that would get me solving problems faster and maybe more "in a programmers way"? EDIT - Seems that there was some confusion about what did I not know to solve FizzBuzz. Maybe I didn't express myself right: I knew the steps needed to solve the problem. What I didn't memorize was the modulus operator. The problem was in transposing basic math to the program, not in knowing basic math. I took the test for fun, after reading about it on Coding Horror. I just decided it was a good base-comparison line between me and formally-trained devs. I just used this as an example of how not having dealt with math in a computer environment before makes me lose time looking up basic things like modulus operators to be able to solve simple problems.

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• determine collision angle on a rotating body

  - by jorb

  update: new diagram and updated description I have a contact listener set up to try and determine the side that a collision happened at relative to the a bodies rotation. One way to solve this is to find the value of the yellow angle between the red and blue vectors drawn above. The angle can be found by taking the arc cosine of the dot product of the two vectors (Evan pointed this out). One of my points of confusion is the difference in domain of the atan2 function html canvas coordinates and the Box2d rotation information. I know I have to account for this somehow... SS below questions: Does Box2D provide these angles more directly in the collision information? Am I even on the right track? If so, any hints? I have the following javascript so far: Ship.prototype.onCollide = function (other_ent,cx,cy) { var pos = this.body.GetPosition(); //collision position relative to body var d_cx = pos.x - cx; var d_cy = pos.y - cy; //length of initial vector var len = Math.sqrt(Math.pow(pos.x -cx,2) + Math.pow(pos.y-cy,2)); //body angle - can over rotate hence mod 2*Pi var ang = this.body.GetAngle() % (Math.PI * 2); //vector representing body's angle - same magnitude as the first var b_vx = len * Math.cos(ang); var b_vy = len * Math.sin(ang); //dot product of the two vectors var dot_prod = d_cx * b_vx + d_cy * b_vy; //new calculation of difference in angle - NOT WORKING! var d_ang = Math.acos(dot_prod); var side; if (Math.abs(d_ang) < Math.PI/2 ) side = "front"; else side = "back"; console.log("length",len); console.log("pos:",pos.x,pos.y); console.log("offs:",d_cx,d_cy); console.log("body vec",b_vx,b_vy); console.log("body angle:",ang); console.log("dot product",dot_prod); console.log("result:",d_ang); console.log("side",side); console.log("------------------------"); }

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• Design pattern to handle queries using multiple models

  - by coderkane

  I am presented with a dilemma while trying to re-designing the class structure for my PHP/MySQL application to make it more elegant and conform it to the SOLID principle. The problem goes like this: Let as assume, there is an abstract class called person which has certain properties to define a generic person, such as name, age, date of birth etc. There are two classes, student, and teacher, that implements this abstract class. They add their own unique properties to it. I have designed all the three classes to include all the operational logic (details of which are not relevant in context of the question). Now, I need to create views/reports/data grids which contain details from multiple classes, for example, say, a list of all students doing projects in Chemistry mentored by a teacher whose name is the parameter to the query. This is just one example of a view, there are many different views in the application, which uses data from 3-4 tables, and each of them have multiple input parameters to generate them. Considering this particular example, I have written the relevant query using JOIN and the results are as expected and proper, now here is the dilemma: Keeping in mind the single responsibility principle, where should I keep this query? It does not belong to either Student class, or Teacher class or any other classes currently present. a) Should I create a new class, say dataView class, and design it as a MVC pattern and keep the query there? What about the other views? how do they fit in this architecture? b) Should I not keep the query in code at all, and make it DB View ? c) Am I completely wrong in the approach? If so what is the right approach? My considerations are as follows: a) should be easy to add new views later on if requirement comes, without having to copy-paste-modify code b) would like to make it as loosely coupled as possible so that if minor db structure changes happen, it does not break I did google searches on report design and OOP report generators, but all the result seem to focus on the visual design of the report rather than fetching the data. I have already taken care of the visual aspect of the report using MVC with html templates. I am sure this is a very fundamental problem with known solution, but I am somehow not able to find it (maybe searching with wrong keyword). Edit1: Modified the title to make it more relevant Edit2: The accepted answer got me thinking in the right direction and identify my design flaws, which eventually led me to find this question and the solution in Stack Overflow which gave me the detailed answer to clear the confusion.

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• Common SOA Problems by C2B2

  - by JuergenKress

  SOA stands for Service Oriented Architecture and has only really come together as a concrete approach in the last 15 years or so, although the concepts involved have been around for longer. Oracle SOA Suite is based around the Service Component Architecture (SCA) devised by the Open SOA collaboration of companies including Oracle and IBM. SCA, as used in SOA suite, is designed as a way to crystallise the concepts of SOA into a standard which ensures that SOA principles like the separation of application and business logic are maintained. Orchestration or Integration? A common thing to see with many people who are beginning to either build a new SOA based infrastructure, or move an old system to be service oriented, is confusion in the purpose of SOA technologies like BPEL and enterprise service buses. For a lot of problems, orchestration tools like BPEL or integration tools like an ESB will both do the job and achieve the right objectives; however it’s important to remember that, although a hammer can be used to drive a screw into wood, that doesn’t mean it’s the best way to do it. Service Integration is the act of connecting components together at a low level, which usually results in a single external endpoint for you to expose to your customers or other teams within your organisation – a simple product ordering system, for example, might integrate a stock checking service and a payment processing service. Process Orchestration, however, is generally a higher level approach whereby the (often externally exposed) service endpoints are brought together to track an end-to-end business process. This might include the earlier example of a product ordering service and couple it with a business rules service and human task to handle edge-cases. A good (but not exhaustive) rule-of-thumb is that integrations performed by an ESB will usually be real-time, whereas process orchestration in a SOA composite might comprise processes which take a certain amount of time to complete, or have to wait pending manual intervention. BPEL vs BPMN For some, with pre-existing SOA or business process projects, this decision is effectively already made. For those embarking on new projects it’s certainly an important consideration for those using Oracle SOA software since, due to the components included in SOA Suite and BPM Suite, the choice of which to buy is determined by what they offer. Oracle SOA suite has no BPMN engine, whereas BPM suite has both a BPMN and a BPEL engine. SOA suite has the ESB component “Mediator”, whereas BPM suite has none. Decisions must be made, therefore, on whether just one or both process modelling languages are to be used. The wrong decision could be costly further down the line. Design for performance: Read the complete article here. SOA & BPM Partner Community For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center. Blog Twitter LinkedIn Facebook Wiki Technorati Tags: C2B2,SOA best practice,SOA Community,Oracle SOA,Oracle BPM,Community,OPN,Jürgen Kress

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• Rendering My Fault Message

  - by onefloridacoder

  My coworkers setup  a nice way to get the fault messages from our service layer all the way back to the client’s service proxy layer.  This is what I needed to work on this afternoon.  Through a series of trials and errors I finally figured this out. The confusion was how I was looking at the exception in the quick watch viewer.  It appeared as though the EventArgs from the service call had somehow magically been cast back to FaultException(), not FaultException<T>.  I drilled into the EventArgs object with the quick watch and I copied this code to figure out where the Fault message was hiding.  Further, when I copied this quick watch code into the IDE I got squigglies.  Poop. 1: ((System 2: .ServiceModel 3: .FaultException<UnhandledExceptionFault>)(((System.Exception)(e.Result)).InnerException)).Detail.FaultMessage I wont bore you with the details but here’s how it turned out.   EventArgs which I’m calling “e” is not the result such as some collection of items you’re expecting.  It’s actually a FaultException, or in my case FaultException<T>.  Below is the calling code and the callback to handle the expected response or the fault from the completed event. 1: public void BeginRetrieveItems(Action<ObservableCollection<Model.Widget>> FindItemsCompleteCallback, Model.WidgetLocation location) 2: { 3: var proxy = new MyServiceContractClient(); 4:  5: proxy.RetrieveWidgetsCompleted += (s, e) => FindWidgetsCompleteCallback(FindWidgetsCompleted(e)); 6:  7: RetrieveWidgetsRequest request = new RetrieveWidgetsRequest { location.Id }; 8:  9: proxy.RetrieveWidgetsAsync(request); 10: } 11:  12: private ObservableCollection<Model.Widget> FindItemsCompleted(RetrieveWidgetsCompletedEventArgs e) 13: { 14: if (e.Error is FaultException<UnhandledExceptionFault>) 15: { 16: var fault = (FaultException<UnhandledExceptionFault>)e.Error; 17: var faultDetailMessage = fault.Detail.FaultMessage; 18:  19: UIMessageControlDuJour.Show(faultDetailMessage); 20: return new ObservableCollection<BinInventoryItemCountInfo>(); 21: } 22:  23: var widgets = new ObservableCollection<Model.Widget>(); 24:  25: if (e.Result.Widgets != null) 26: { 27: e.Result.Widgets.ToList().ForEach(w => widgets.Add(this.WidgetMapper.Map(w))); 28: } 29:  30: return widgets; 31: }

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• What's Happening in Business Analytics at OpenWorld 2012?

  - by jmorourke

  Oracle OpenWorld 2012 is rapidly approaching on September 30th when we take over the city of San Francisco for five days.  The Business Analytics this year is our strongest ever with over 150 EPM, BI, Analytics and Data Warehousing sessions delivered by Oracle, our customers and partners.  We’ll also have Hands-On Labs, 20 demo pods dedicated to Business Analytics products, and over 30 partners exhibiting their solutions.  So what’s hot in the Business Analytics program at OpenWorld?  Here are some of the “can’t miss” sessions at this year’s conference: The EPM and BI general sessions, led by SVP of Product Development Balaji Yelamanchili will highlight what’s new provide a view into Oracle’s EPM, BI and Analytics strategies.  Both sessions are scheduled on Monday, October 1st. Thursday Keynote:  See More, Act Faster:  Oracle Business Analytics, led by Oracle President Mark Hurd, will provide a view into Oracle’s strategy for Business Analytics, especially engineered systems designed to provide extreme performance for the most rigorous analytic tasks. Superfast Business Intelligence with Oracle Exalytics.  Hear about various business intelligence scenarios in which Oracle Exalytics provides exemplary value—from operational reporting and prepackaged applications to analytics on unstructured data. Turn Insights into Real-Time Actions with Oracle Business Intelligence Mobile.  Learn how Oracle Business Intelligence Mobile enables organizations to deliver relevant information and turn insight into real-time action, no matter where employees are located. Empowering the Business User: Introduction to Oracle Endeca Information Discovery.  Find out how you can find fast answers to the new questions that confront your business every day, while avoiding the confusion and inconsistencies brought about by spreadsheets and desktop tools. Big Data:  The Big Story.  Learn how to harness big data, your existing data, and predictive analytics to make better decisions in an environment of rapid shifts in behavior and instant feedback.  Learn about the technologies that constitute a big data architecture, how to leverage and implement advanced analytics for real-time decisions, and the tools needed to know the unknown. Planning at the Speed of Business with Oracle Exalytics.  Learn how Oracle Hyperion Planning leverages the power of Oracle Exalytics to do planning faster, with more detail and more users than ever. For more details on these and other Business Analytics sessions at OpenWorld, download the Focus On Business Analytics program guide at:  http://www.oracle.com/openworld/focus-on/index.html We look forward to seeing you in San Francisco!

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• High-Powered Sites for low Cost

  - by HighAltitudeCoder

  Ahh, I am experiencing the intimidation of my very first post - visible by the whole world. Ok, here goes.   This first post is nothing exceptional.  It is simply a recommendation based (fittingly, I suppose) upon the job search you may be gearing up for.  I find myself in this very situation right now.  And, I will take my own recommendation after posting this entry. Job-Seekers: To the left you will notice two links under "Recommended Learning".  I have found these links to be invaluable when it comes to re-tooling, re-familiarizing, or otherwise resharping my skills when looking for that next job. Often, you will find job-postings with the text, usually posted after a laborious list of qualifications indicating the company's desire to hire candidates who know what they are doing: "...Looking for a candidate who can hit the ground running...".  The interesting thing about this post to me is I've encountered many individuals who, after speaking and working with them for some time, I've realized are perfectly capable of hitting the ground running - and FAST.  But what if they speed off in the wrong direction? The next time you spearhead a major task in your job, ask yourself: Am I headed in the wrong direction?  There are many ways to do this.  In fact, I've found in this new field there are more tempting ways to steer your project in the wrong direction than there are good ones.  I don't want to suggest that every one of my posts will fall into the "right direction" category, however I do think a healthy dose of introspection of the pros and cons will always be beneficial before you set off. That said, allow me to expound on the previously mentioned links. These web sites are invaluable.  They demonstrate the capabilities of existing as well as new and upcoming tools available in several IDE's.  I've viewed many tutorials in LearnVisualStudio.NET, and only one or two so far in TrainingSpot, however I've been delighted in their simplicity and straightforward approach to proper usage of the particular tool or concept being discussed.  They have not (so far in my experience) demonstrated ways in which to use the tools that become cumbersome, impractical, or error-prone. Each website has step-by-step videos that can be paused, replayed, and most importantly, they are done in real time.  As the author is typing, the viewer gets to experience the coding experience from a first-person perspective, including syntax errors, unexpected behaviors, IDE setup idiosyncracies, everything.  A subtle value I've gained from these videos is that a certain degree of confusion and introspection is normal when working with new tools and exploring new paths.  They (as well as your own experience) are not to be feared, but enjoyed.  I highly recommend them. Good work, guys!

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• WiFi on Ubuntu 12.04 custom: downloading unbearably slow

  - by Mark

  iwconfig reports 11 Mbps, yet I've seen as low as <1 KBps. This is the latest in my laundry list of Ubuntu problems in a dual-boot machine (cyberpowerpc custom, intel i7-3820, nvidia gtx 570). I received it two days ago, Windows 7 running fine, still having problems with Ubuntu. The browsing is intermittent but unacceptable. e.g. I could get to this site last night but I couldn't post this question. The downloading is unbearably slow, I can't download anything or install any packages because the speed is so slow. e.g. I am trying to install vim which is inexplicably missing from my 12.04 install (add another one to the problems list) and my download speed reported in the terminal was 241 B/s. Yes, bytes. iwconfig reports 11 Mbps, which further adds to the confusion. User@ubuntu:~$ iwconfig lo no wireless extensions. wlan0 IEEE 802.11bgn ESSID:"linksys" Mode:Managed Frequency:2.437 GHz Access Point: 00:18:39:76:2C:A1 Bit Rate=11 Mb/s Tx-Power=20 dBm Retry long limit:7 RTS thr:off Fragment thr:off Power Management:off Link Quality=36/70 Signal level=-74 dBm Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0 Tx excessive retries:54 Invalid misc:18 Missed beacon:0 eth0 no wireless extensions. Any ideas? I see this is a problem a lot of people, but none of the on line solutions have worked for me so far. e.g. one site recommends editing the ath9k.conf file in /etc/modprobe.d, yet this file isn't even in the folder: User@ubuntu:/$ cd etc/modprobe.d User@ubuntu:/etc/modprobe.d$ ls alsa-base.conf blacklist-oss.conf blacklist-ath_pci.conf blacklist-rare-network.conf blacklist.conf blacklist-watchdog.conf blacklist-firewire.conf dkms.conf blacklist-framebuffer.conf nvidia-current_hybrid.conf blacklist-modem.conf nvidia-graphics-drivers.conf I think the nvidia gpu might be mucking things up. I had the "blinking cursor" problem when installing in the first place, and then I had the monitor out of range problem as well. I have my faithful Asus laptop, which is running Ubuntu 12.04 just fine. The only difference is executing host -t SOA local in the terminal gives User@ubuntu:~$ host -t SOA local local has SOA record local. nobody.localhost. 42 86400 43200 604800 10800 in my new machine, and the command reports Host local. not found in the laptop. Help would be most welcome, as I am in danger of reverting back to Windows. I'm seriously considering it. Sorry for the length, trying to show my effort in resolving the issue and include terminal snippets that might be helpful.

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• PMDB Block Size Choice

  - by Brian Diehl

  Choosing a block size for the P6 PMDB database is not a difficult task. In fact, taking the default of 8k is going to be just fine. Block size is one of those things that is always hotly debated. Everyone has their personal preference and can sight plenty of good reasons for their choice. To add to the confusion, Oracle supports multiple block sizes withing the same instance. So how to decide and what is the justification? Like most OLTP systems, Oracle Primavera P6 has a wide variety of data. A typical table's average row size may be less than 50 bytes or upwards of 500 bytes. There are also several tables with BLOB types but the LOB data tends not to be very large. It is likely that no single block size would be perfect for every table. So how to choose? My preference is for the 8k (8192 bytes) block size. It is a good compromise that is not too small for the wider rows, yet not to big for the thin rows. It is also important to remember that database blocks are the smallest unit of change and caching. I prefer to have more, individual "working units" in my database. For an instance with 4gb of buffer cache, an 8k block will provide 524,288 blocks of cache. The following SQL*Plus script returns the average, median, min, and max rows per block. column "AVG(CNT)" format 999.99 set verify off select avg(cnt), median(cnt), min(cnt), max(cnt), count(*) from ( select dbms_rowid.ROWID_RELATIVE_FNO(rowid) , dbms_rowid.ROWID_BLOCK_NUMBER(rowid) , count(*) cnt from &tab group by dbms_rowid.ROWID_RELATIVE_FNO(rowid) , dbms_rowid.ROWID_BLOCK_NUMBER(rowid) ) Running this for the TASK table, I get this result on a database with an 8k block size. Each activity, on average, has about 19 rows per block. Enter value for tab: task AVG(CNT) MEDIAN(CNT) MIN(CNT) MAX(CNT) COUNT(*) -------- ----------- ---------- ---------- ---------- 18.72 19 3 28 415917 I recommend an 8k block size for the P6 transactional database. All of our internal performance and scalability test are done with this block size. This does not mean that other block sizes will not work. Instead, like many other parameters, this is the safest choice.

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• Are VMWare ESXi 5 patches cumulative?

  - by ewwhite

  It seems basic, but there's confusion about the patching strategy needed to manually update standalone VMWare ESXi hosts. The VMWare vSphere blog attempts to explain this, but it's still not clear. From the blog: Say Patch01 includes updates for the following VIBs: "esxi-base", "driver10" and "driver 44". And then later Patch02 comes out with updates to "esxi-base", "driver20" and "driver 44". P2 is cumulative in that the "esxi-base" and "driver44" VIBs will include the updates in Patch01. However, it's important to note that Patch02 not include the "driver 10" VIB as that module was not updated. Many of my ESXi installations are standalone and do not make use of Update Manager. It is possible to update an individual host using the patches make available through the VMWare patch download portal. The process is quite simple, and that part makes sense. The bigger issue is determining what to actually download and install. In my case, I have a good number of HP-specific ESXi builds that incorporate sensors and management for HP ProLiant hardware. Let's say that those servers start at ESXi build #474610 from 9/2011. Looking at the patch portal screenshot below, there is a patch for ESXi update01, build #623860. There are also patches for builds #653509 and #702118. Coming from the old version of ESXi, what is the proper approach to bring the system fully up-to-date? Which patches are cumulative and which need to be applied sequentially? Perhaps the download size is the confusing factor, but is installing the newest build the right approach, or do I need to step back and patch incrementally?

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• Cisco: Site-to-site VPN with cisco 878 and ASA weirdness

  - by cpf

  I currently have 2 sites, both connected to each other through 2 firewalls / routers in a site-to-site VPN. Pinging from server to server (Using 2mb/2mb SDSL) through that VPN obviously works, however, at one site, we have another internet connection (7m/400k ADSL), and only the link between the two sites should be on the other connection. All pc's should go over the other connection for internet, just communication between servers & Communication between pc's and the server at the other side should go through there too. What is configured at the moment is the server is using the SDSL directly as default gateway. Since it's not intended to surf anything it is a safe config. PC's are configured on the ADSL as default gateway. Now I wanted to route through everything that uses the range used on the other site, it should be sent from the ADSL modem to the SDSL modem, which has the VPN connection. I figured I could use OSPF to do so, however, OSPF doesn't seem to "detect" the range of the external site. Also (due to bad ip subnetting thanks to the other administrator), the ip used internally as the server on the other site also exists on the internet (causing a lot of confusion), so rdp-ing from our server to the server of the other site works (somehow), but tracerouting on the SDSL router (which should actually, in my opinion, go over the VPN) actually goes all over the internet. My question(s): Why doesn't the SDSL router ping the external ip through VPN, but the server does? Why can't I route from the ADSL router to the SDSL over VPN? I would seriously appreciate some help, since I can't figure out why it does it like this.

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• Account Lockout with pam_tally2 in RHEL6

  - by Aaron Copley

  I am using pam_tally2 to lockout accounts after 3 failed logins per policy, however, the connecting user does not receive the error indicating pam_tally2's action. (Via SSH.) I expect to see on the 4th attempt: Account locked due to 3 failed logins No combination of required or requisite or the order in the file seems to help. This is under Red Hat 6, and I am using /etc/pam.d/password-auth. The lockout does work as expected but the user does not receive the error described above. This causes a lot of confusion and frustration as they have no way of knowing why authentication fails when they are sure they are using the correct password. Implementation follows NSA's Guide to the Secure Conguration of Red Hat Enterprise Linux 5. (pg.45) It's my understanding that that only thing changed in PAM is that /etc/pam.d/sshd now includes /etc/pam.d/password-auth instead of system-auth. If locking out accounts after a number of incorrect login attempts is required by your security policy, implement use of pam_tally2.so. To enforce password lockout, add the following to /etc/pam.d/system-auth. First, add to the top of the auth lines: auth required pam_tally2.so deny=5 onerr=fail unlock_time=900 Second, add to the top of the account lines: account required pam_tally2.so EDIT: I get the error message by resetting pam_tally2 during one of the login attempts. user@localhost's password: (bad password) Permission denied, please try again. user@localhost's password: (bad password) Permission denied, please try again. (reset pam_tally2 from another shell) user@localhost's password: (good password) Account locked due to ... Account locked due to ... Last login: ... [user@localhost ~]$

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• Why does bash sometimes think my $HOME isn't the correct directory?

  - by Adam Yanalunas

  Like the title says it seems that bash sometimes misidentifies my $HOME. This cropped up after a seemingly unique series of events that I will now replay in broad strokes. Running OS X 10.6 with normal, local account Work binds my account to Active Directory Much time passes with no issues Set up rvm to manage Ruby installs (this becomes important later) Upgraded to OS X 10.7 a few days ago After successful install, attempted to log in, was presented with "Must reset password" dialog that never allowed a password to be reset. Would simply shake the box after new password was entered. Much googling was done. Much more googling was done. Swearing was had. Logged in as root, created new account, set as admin, deleted /Users/[new account], renamed /Users/[old account] to /Users/[new account] Logged out of root, logged into new account with no issues After OS X asking for a my account password a few times to update Keychain and other system-level stuff it was back to business as usual. Opened Terminal, cd to project folder, tried "rails server" and was presented with: /usr/local/lib/ruby/1.9.1/rubygems/dependency.rb:247:in to_specs': Could not find rails (>= 0) amongst [] (Gem::LoadError) from /usr/local/lib/ruby/1.9.1/rubygems/dependency.rb:256:into_spec' from /usr/local/lib/ruby/1.9.1/rubygems.rb:1210:in gem' from /usr/local/bin/rails:18:in' Ran through a few exercises, decided to rm -rf ~/.rvm and reinstall. Running a --trace on the rvm installer shows it dies on this line: mkdir: /Users/[old account]: Permission denied Scrolling back through the --trace log I see many more mentions of /Users/[old account]. When inspect the install script the offending line is looking at "${HOME}/.rvm" as it tries to run the mkdir. To my confusion I also see mentions of /Users/[new account] in the log. I've tried exporting a new HOME in my .bash_profile to no luck. Can anyone guess why /Users/[old account] would still be kicking around?

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• Endian Destination NAT

  - by Ben Swinburne

  I have installed Endian Community Firewall 2.3 and am clearly misunderstanding/doing something wrong with it. I'm trying to create some destination NAT rules to allow incoming connections to various services within the network. Router - RED I/F - x.x.x.x Router - GREEN I/F - 192.168.11.253 ECF - RED I/F - 192.168.11.254/24 ECF - GREEN I/F - 192.168.12.254/24 Target server - 192.168.12.1 Please ignore the haphazard choice of subnets and addresses- I'm trying to quickly plop Endian into an existing network before a complete rework in 6-12 months so for now. Everything works except destination NAT, so outgoing connections are fine, the routes between the two subnets are OK etc. I want to create various incoming NATs but let's take for the sake of argument, SMTP port 25 from the Internet to Target server 192.168.12.1. I've tried almost every combination of options in the Destination NAT section to achieve this and clearly am doing something wrong. I suspect my confusion must be somewhere in the Access From and/or Target section. The rest seems OK Filter Policy = Allow Service = SMTP Protocol = TCP Port = 25 Translate to type = IP DNAT Policy = NAT Insert IP = 192.168.12.1 Port Range = 25 Enabled = Checked Position = First I can't work out what I'm doing wrong, or am I doing it right and it's just not working!? Any help would be greatly appreciated.

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• Default or fink python and lxml under 10.6.8

  - by songdogtech

  Ah, confusion. I'm trying to install a python library called lxml as needed by a python script. I've been through numerous SU quesitons and answers. I haven't been able to make much progress. I run easy_install lxml and get: Processing lxml-3.0.1-py2.6-macosx-10.6-universal.egg lxml 3.0.1 is already the active version in easy-install.pth Using /Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg Processing dependencies for lxml Finished processing dependencies for lxml but when I run my script, I get: File "scraper.py", line 3, in import lxml.html File "/Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/html/init.py", line 42, in from lxml import etree ImportError: dlopen(/Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/etree.so, 2): Symbol not found: _htmlParseChunk Referenced from: /Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/etree.so Expected in: flat namespace in /Library/Python/2.6/site-packages/lxml-3.0.1-py2.6-macosx-10.6-universal.egg/lxml/etree.so I think that maybe I'm not using the correct python install? I've installed python with fink, but should I use OS X's python? This is in my .profile: test -r /sw/bin/init.sh && . /sw/bin/init.sh which points to the fink install. echo $PATH gives me: /sw/bin:/sw/sbin:/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin:/usr/X11R6/bin Should I change that to point to snow leopard's python? (Which is 2.6.1) In Library/, there is: which are the lxml libaries I need, it appears, as well as requests. And whereis python gives me /usr/bin/python What do I do? How do I get python to use these libraries. And which python?

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• switchless Infiniband between two servers on RHEL 6.3

  - by exfizik

  I have 2 servers running RHEL 6.3 which have 2 port Infiniband cards >lspci | grep -i infini 07:00.0 InfiniBand: QLogic Corp. IBA7322 QDR InfiniBand HCA (rev 02) I'm interested in connecting them directly to each other bypassing an Infiniband switch (which I don't have). Quick googling showed that at least in some configurations it's possible. I installed all RedHat Infiniband packages with yum groupinstall "Infiniband Support". However, ibv_devinfo shows that both ports in each card are down, which indicates that cables are not connected. But the cable is connected, although the LEDs are off on the cards (not a good sign). Another source of confusion for me is that according to this, RedHat doesn't come with OFED packages and I'm slightly hesitant to install them from source due to the lack of RedHat support for them... So where am I going with this? The questions I have are: is it possible to have a switchless/direct Infiniband connection between two servers the way I described above? If it's possible, do I have to use the OFED packages or can I configure everything with just the packages coming with RHEL. Why are the LEDs off on my servers even though the cable is connected? Any additional input/advice/pointers would be appreciated. P.S. I followed this guide for installation instructions. The Infiniband cards are clearly recognized by my OS and the rdma service is running. Update: I have opensm installed. When I run it it says: OpenSM 3.3.13 Command Line Arguments: Log File: /var/log/opensm.log ------------------------------------------------- OpenSM 3.3.13 Entering DISCOVERING state Using default GUID 0x1175000076e4c8 SM port is down and stays at that point.

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• ssh X11 forwarding issue

  - by bbuser

  I have put ForwardX11 in my ~/.ssh/config and then I start a X11 application like this: ssh -f user@host 'someapp; sleep 1' This works fine. The application someapp has a button which opens a viewer application via a shell script viewer.sh. When I press the button the viewer comes up. This is all good and as expected, but if I do ssh -2 -f user@host 'someapp; sleep 1' there's trouble. someapp starts very well, but if I click the button the viewer doesn't show up. As the viewer is called via a shell script, I replaced the call with xclock and the situation was exactly the same - I think the viewer is not to blame. The situation is the same on Linux and AIX. The reason I need -2 is that I finally want to use connection multiplexing and this does only work with version 2. The reason for the sleep 1 is that it didn't work otherwise;-) To add more confusion, with ssh -2 -f user@host 'xterm &; app; sleep 1' the viewer works as long as the xterm is open. When I close xterm ssh -v outputs the following debug1: channel 1: FORCE input drain debug1: channel 0: free: client-session, nchannels 3 debug1: channel 1: free: x11, nchannels 2 and from that moment the viewer doesn't show when I press the button. I also replaced the viewer application with a script that writes the $DISPLAY variable to a file. The variable is always set correctly.

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• VMware Workstation executes nonexisting and outdated File

  - by RED SOFT ADAIR-StefanWoe

  I execute a command line program from a VM (VMware 7.1.1) with Windows XP. The executable file is located on the host machine. If i start a command line in the VM, using a drive mounted as .host\SharedFolders i see the following: D:\projects\myProgram\WinRel>dir myProgram.exe 02.09.2010 21:15 245.760 myProgram.exe D:\projects\myProgram\WinRel>myProgram.exe Processing BuildFeb 26 2009 This is wrong! The whole execution of the program behaves like the version that is outdated more than one year! I triple checked that there is no confusion or anything If i start the Program on the host or if i even start it from the VM using a UNC Path, it shows the last build date and executes as expected: C:\>dir \\myMachine\drive_d\projects\myProgram\WinRel\myProgram.exe 02.09.2010 21:15 245.760 myProgram.exe C:\>\\myMachine\drive_d\projects\myProgram\WinRel\myProgram.exe Processing Build: Sep 2 2010 Can this behavior somehow be explained? There MUST be a cache for the host mounted drive. The program it executes does not exist anymore! If i remove it from the host, the VM can not execute it anymore. If i restore it, the behavior becomes the same again.

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• Outlook 2010, 2007 Sync problems after migration from SMTP to Exchange

  - by kirgy

  Our organization recently switched from an SMTP server to an Exchange server, since then several user's Outlook's are not synchronizing their emails as expected with the Exchange server. Our move over from an SMTP server to an Exchange server consisted of adding the new Exchange account alongside the existing SMTP account, drag-dropping/copy-pasting folders client-side from the SMTP account in the folder pane in outlook, to the newly created Exchange account. The problem happens when a user moves an email to a folder from their inbox or another folder. At this point the email disappears from Outlook client side. Re-syncing the folder, send/receive, closing/opening outlook and even system reboots do not make this email reappear. The Outlook web interface (OWA) reports the email is in fact in the folder they placed it in, and is not deleted. Doing a "search all mail items" for the emails shows that the email is still there; not deleted nor removed. To add to the confusion, when new folders are created and the email is placed in these folders, the synchronization happens without any issue both client side and server side. As the emails are appearing server side, we are confident to presume this is a client side issue. We have tried adding/removing accounts on one system which resulted in the same issue. This was a very long and slow process due to the sheer volume of emails (20gig+ from most users). We have tried reinstalling outlook restoring accounts from back-ups which has not resolved the issue. We also tried upgrading one system from outlook 2007 to outlook 2010 which, again, did not resolve the issue. We have experienced issues with a lot of emails disappearing during the copy-over process in which I'm not convinced it was the best route of migration, but nonetheless we are where we are. Can anyone suggest potential avenues of solutions to resolve this issue? Thank you. Systems: Windows 7 (10 systems) Windows XP (2 systems) Outlook 2007 (2 systems) Outlook 2010 (7 systems) Problem Outlook systems: Windows XP, Outlook 2007 x 1 Windows 7, Outlook 2007 x1 Windows 7, Outlook 2010 x 2

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• Is this SPF record correct for me?

  - by DT

  I'm completely new to Stack Overflow, so Hi! I need to add an SPF record to my site "main.com" (not the real address) to allow an email publishing company "emailpublishers.com" (not the real address) to send emails on my behalf. However, I'm nervous about adding an SPF record because of the havoc it could wreak if done incorrectly. I use Google Apps. I also use "auxiliary.com" to send mail from "main.com." And, of course, I use "main.com" to send mail as well. "auxiliary.com" doesn't have an SPF record. I used Microsofts' and OpenSPF's wizards to generate the following SPF entry. Does it seem to be correct for me? "v=spf1 a mx ip4:55.55.555.55 mx:alt1.aspmx.l.google.com mx:alt2.aspmx.l.google.com mx:aspmx.l.google.com mx:aspmx2.googlemail.com mx:aspmx3.googlemail.com mx:aspmx4.googlemail.com mx:aspmx5.googlemail.com a:auxiliary.com include:_spf.google.com include:auxiliary.com mx:auxiliary.com include:emailpublishers.com mx:emailpublishers.com ~all" However, my host MediaTemple says in a knowledge base article to use: v=spf1 a:main.com/20 ~all So that added to my confusion. Thanks a lot!

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• Are SATA II and SATA 3.0 Gbps compatible?

  - by Johnny Maelstrom

  I am trying to check that if I buy a new internal HDD it will work in the NAS I am buying. Currently I'm confused about naming schemes and once that is resolved whether there is compatibility. I will gladly author this question to be more general if there is not already an article helping with the confusion of SATA naming and standards. I see similar, but not identical questions and will accept this as a duplicate if thought as such. The specifications on the eCommerce site for the NAS says, "Controller Interface Type Serial ATA-150", the product home page for the manufacturer says, "Compatible with SATA and SATA II HDD". The specifications on the eCommerce site for the hard drives say, "Interface Type Serial ATA-300", the product home page for the manufacturer says, "Interface SATA 3.0 Gbps" Wikipedia says many things about different naming conventions, the closest being, "SATA II 3.0 Gbit/s, which was colloquially referred to as "SATA 3G" [bps] or "SATA 300" [MB/s] since 1.5 Gbit/s SATA I and 1.5 Gbit/s SATA II were referred to as both "SATA 1.5G" [b/s] or "SATA 150" [MB/s]). Therefore, they will operate with negligible differences between them." Are SATA II and SATA 3.0 Gbps the same? I feel I'm tantalisingly close to getting a definitive answer here before I purchase, but really want to clear up these naming schemes.

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• How to configure SCSI hard drives and RAID for Poweredge 2850 web server

  - by Saul

  I'm trying to set up a Poweredge 2850 as a web server, but as a server novice it's causing me some confusion. Its a virgin install so no data to be lost as yet, so I'd like to get the best arrangement for setting up Windows Server 2008. The box will run IIS, a mail and FTP server. The current physical arrangement of the hot swap drives is 1 73GB 3 146GB 5 blank 0 73GB 2 146GB 4 146GB (but flashes green, amber off) When I enter the PERC config screens on boot up I've got Raid Ch- 0 ID 0 ONLIN A00-00 1 ONLIN A00-01 2 ONLIN A01-00 3 ONLIN A01-01 4 HOTSP I think that drives 0 and 1 are set to RAID 1 and drives 2 and 3 are also set to RAID 1, certainly I can see 2 logical drives, both raid 1 of 69880MB and 139900MB Now what I think I am getting here is that the 2 73GB drives mirror each other and the 2 146GB drives mirror 2? so by my noob thinking if a drive fails I can pull it, insert and new one and it will reduplicate from its matching pair? I think the flashing amber probably indicates a failing drive in slot 4, should that just be binned? What confuses me coming from a home user XP background is that when I load up Windows Server 2008 OS under my computer I only see a C drive of about 70GB capacity. i.e wheres the 146GB drive? Any advice appreciated

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• Pivot tables: How can I total the subtotal?

  - by Mike

  Person A needs £115, Person D £234 and Person G £789, but how do I SUM that and get it to show on the same ROW as the subtotal? The Rows are subscription names. The Value field holds the Cost per subscription. the Columns holds the name of the person who receives the subscription. I have GROUPED on YEAR & MONTH, and have a subtotal that shows me how much each person will need to pay each month for all their subscriptions, but I need a figure showing me the total of all the subscriptions per month. I've tried adding calculated fields, but I want to SUM the subtotals so I'm struggling to see the field I need to use. I've tried Grand Totals but that SUMS all rows and I really only want SUM the Subtotal Total Row. I need a nice neat report that my managers won't go white at when looking at it...to many numbers = fear and confusion. Anyway it got messy, so I've come for help. Cheers Mike.

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• Windows server 2008, Dns. I'm confused

  - by Dejan.S

  Hi. I recently setup a window server 2008 server at work. Keep in mind I have never worked with it before:). Background story is I try to host a couple of sites on the server through iis7, I got domains (currently hosted at other hosters for the moment). I want to point the domain NS to my server on all of them. I have read how to setup a DNS on the server, so far so good. now my dns is companyname.com in the server manager I got DNS / companyname.com in there I got ns.comanyname.com, in there I got Host(A) with the server ip now this is where I get confused about how things work with DNS, NS & Host(A). I dont know how to assign(so to speak) the Host(A) to one of my webapps hosted on the iis7, because that is the pointer right?. To leave an example to work with lets say, Hosted.com is hosted on my iis7, on port 81. You don't understand how great full I would be if somebody could explain this confusion. EDIT: Do I need to create a DNS for every site hosted on my server? Or just make a A Host/Record? Thanks guys

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• Desktop virtualization

  - by gurpal2000

  Is there currently a proper Type 1 "desktop" hypervisor? Either free or not? This is just for tinkering around at home on some beefy Phenom machines. Basically i want to be able to run say 2 OSs on the same PC but without loading windows or a heavy flavour of linux and then use a hotkey to switch between them. I should get full performance out of them. So do i need something better than vmware workstation and/or virtualbox. I think these are "Type 2"? I already run VMWare w/s and VBox but is there a more performant solution? I saw a YouTube video from Citrix where a laptop was running XP and Vista. With the touch of a hot key they could switch between them. There was no visible underlying OS (there might be a hypervisor)? I have access to Citrix XenDesktop 3 enterprise edition evaluation. I realise this isn't for desktops but can i achieve my goal (geekiness) ? If i use the free XenServer 5.5.0 how do my client PCs access windows/linux/whatever from the xenserver? Is it via a thin client RDP type application? If so if there one for both windows and linux? Also if i do use XenServer can i use USB in either direction? What is Citrix receiver can i use that for (3) ? If so, is there some hotkey i can configure? whatever client is used to access the server software (whether it be on a different server or local) can i get full opengl/directx acceleration? what about Xen? i tried the Xen LiveCD but no clue as how to configure it. As you can see much confusion. Any help/pointers welcome. Cheers.

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