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• Open Source Projects for Beginning Coders?

  - by MattDMo

  After working as a molecular biologist at the bench for many years, I lost my job last year and am thinking about a career change. I've been using open-source software and doing Linux system administration since the mid 90s, and have written/improved some small shell/Perl/PHP scripts, and am very comfortable building from source, but never progressed to creating non-trivial programs de novo. I want to move to actually learning real programming skills and contributing back to the community, with the possible eventual goal of getting into bioinformatics as a career in the future. I'm a stay-at-home dad now, so I have some time on my hands. I've done a lot of research on languages, and have settled on Python as my major focus for now. I'm set up on GitHub, but haven't forked anything yet. I've looked around OpenHatch some, but nothing really grabbed me. I've heard the advice to work on what you use/love, but that category is so broad that I'm having trouble finding any one thing to get started on. What are your suggestions for getting started? How do you pick a project that will welcome your (possibly amateurish) help? With a fairly limited skill set, how do you find a request that you can handle? What are common newbie mistakes to avoid? Any other advice?

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• NGINX downloads text file instead of displaying it

  - by Hoang Lam

  I have Nginx installed with the following nginx.conf: user nginx; worker_processes 1; error_log /var/log/nginx/error.log; pid /var/run/nginx.pid; events { worker_connections 1024; } http { include /etc/nginx/mime.types; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /vagrant/access.log main; sendfile on; keepalive_timeout 65; include /etc/nginx/conf.d/*.conf; } Everytime I tried the URL of any text files (not PHP, it works fine), the browser asks to download it. Common measure such as disabling default-type octet/stream fails.

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• My WiFi gets deauthenticated every few minutes or seconds (Reason: 7)

  - by dan

  My Wifi on my new Thinkpad W520 running Natty keeps dropping out and coming back on. Output from dmesg below. Any advice? [30493.687552] wlan0: authenticate with e0:91:f5:ef:7b:b2 (try 1) [30493.689127] wlan0: authenticated [30493.689144] wlan0: associate with e0:91:f5:ef:7b:b2 (try 1) [30493.693592] wlan0: RX AssocResp from e0:91:f5:ef:7b:b2 (capab=0x411 status=0 aid=4) [30493.693595] wlan0: associated [31631.172868] wlan0: deauthenticated from e0:91:f5:ef:7b:b2 (Reason: 7) [31631.211847] cfg80211: All devices are disconnected, going to restore regulatory settings [31631.211868] cfg80211: Restoring regulatory settings [31631.211873] cfg80211: Calling CRDA to update world regulatory domain [31631.215037] cfg80211: Ignoring regulatory request Set by core since the driver uses its own custom regulatory domain [31631.215042] cfg80211: World regulatory domain updated: [31631.215044] cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) [31631.215046] cfg80211: (2402000 KHz - 2472000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [31631.215049] cfg80211: (2457000 KHz - 2482000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) [31631.215051] cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (300 mBi, 2000 mBm) [31631.215053] cfg80211: (5170000 KHz - 5250000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [31631.215055] cfg80211: (5735000 KHz - 5835000 KHz @ 40000 KHz), (300 mBi, 2000 mBm) [31632.289638] wlan0: authenticate with e0:91:f5:ef:7b:b2 (try 1) [31632.291262] wlan0: authenticated [31632.291276] wlan0: associate with e0:91:f5:ef:7b:b2 (try 1) [31632.295119] wlan0: RX AssocResp from e0:91:f5:ef:7b:b2 (capab=0x411 status=0 aid=4) [31632.295123] wlan0: associated [31886.234836] wlan0: deauthenticated from e0:91:f5:ef:7b:b2 (Reason: 7) [31886.306735] cfg80211: All devices are disconnected, going to restore regulatory settings [31886.306740] cfg80211: Restoring regulatory settings [31886.306744] cfg80211: Calling CRDA to update world regulatory domain

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• Question about exim4 config syntax

  - by PeterMmm

  I'm trying to send a notification to the sender of a message when a message is send to exactly one address in the local domain ([email protected]). Q1: How would be the syntax for the condition (the above don't work) ? : notify_reply: driver=accept domains = +local_domains senders = ! ^.*-request@.*:\ ! ^bounce-.*@.*:\ ! ^.*-bounce@.*:\ ! ^owner-.*@.*:\ ! ^postmaster@.*:\ ! ^webmaster@.*:\ ! ^listmaster@.*:\ ! ^mailer-daemon@.*:\ ! ^root@.*:\ ! ^noreply@.* condition = ${if eq {$received_for}{[email protected]}} no_expn transport=notify_transport unseen no_verify Q2: How to write multiline string in the config file for "text" ? : notify_transport: driver=autoreply [email protected] to=$sender_address subject=Your mail for text="Please resend your messasge to [email protected] This is a temporary modification."

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• Laptop screen turns off on removing power cord

  - by YatharthROCK

  After a recent upgrade to Windows 8.1 Pro from W8, my laptop's screen turns off as soon as you remove the power cord. It turns back on with no issues when you plug the power back in. Keyboard and mouse input is processed while the screen is off. My settings tell the screen to go off after 2 minutes of inactivity on battery. I was having a battery issue from before where my laptop would should down after 5 minutes of running on battery (despite showing 60% left), but I think that's unrelated. Any other info will be provided on request. Can anyone help me figure out what's going on? How can I stop this behaviour?

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• Authenticate native mobile app using a REST API

  - by Supercell

  I'm starting a new project soon, which is targeting mobile application for all major mobile platforms (iOS, Android, Windows). It will be a client-server architecture. The app is both informational and transactional. For the transactional part, they're required to have an account and log in before a transaction can be made. I'm new to mobile development, so I don't know how the authentication part is done on these platforms. The clients will communicate with the server through a REST API. Will be using HTTPS ofcourse. I haven't yet decided if I want the user to log in when they open the app, or only when they perform a transaction. I got the following questions: 1) Like the Facebook application, you only enter your credentials when you open the application for the first time. After that, you're automatically signed in every time you open the app. How does one accomplish this? Just simply by encrypting and storing the credentials on the device and sending them every time the app starts? 2) Do I need to authenticate the user for each (transactional) request made to the REST API or use a token based approach? Please feel free to suggest other ways for authentication. Thanks!

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• Is there a way i can see why Squid (Proxy Server) determines why a resources should be a MISS?

  - by Pure.Krome

  Hi folks, I'm using Fiddler/FireBug to debug some of our live server web content. We're getting a lot of :- X-Cache: MISS from X-Cache-Lookup: MISS from :8080 Via: 1.1 :8080 (squid/2.7.STABE3) I thought i knew a lot about cache-control / expires / last-modified / etags, etc.. but maybe not. So .. is there a way I can run squid in some verbose way to see why it thinks a resource which i request, is cached/is not getting cached, etc.. which is why we're getting MISSes back? cheers :)

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• Monitoring host and app parameters in real-time

  - by devopsdude42

  I have a bunch of VMs that I need to monitor in real-time. For all nodes I need to watch host parameters like load, network usage and free memory; and for some I need app-specific metrics too, like redis (some vars from the output of INFO command) and nginx (like requests/sec, avg. request time). Ideally I'd also like to track some parameters from the custom apps that run on these node too. These parameters should get tracked as a bunch of line charts on a dashboard. I checked out graphite and it looks suitable (although the UX and aesthetics looks like it needs some love). But setting up and maintaining graphite looks to be a pain, esp. since we don't have a full-time person just for this. Are there any alternatives? Or at least something that is simpler to setup and will scale? Reasonable paid services are also ok.

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• Web migration of a VB6 system with VWG

  - by Webgui

  Brinks Bolivia eSAC System (Customer Service) allows to register all different kinds of contacts for a customer; addition to maintaining an updated status of each service or customer request, to have accurate information and perform the appropriate procedures for all applications. The system was originally developed in VB6 and since web access was essential it was offered via Citrix. Since the application's performance was a critical issue as well as the need to offer the system without specific installations the company looked for a solution that would solve those drawbacks of using Citrix. Searching for a solution that would allow it to offer the eSAC system over the web without the need for specific client installations and provide sufficient performance levels even when there is limited bandwidth lead Brinks to a decision to migrate their VB6 Customer Service system to to Visual WebGui. "Developing on Visual WebGui we were able to migrate the system to web environment and even add new features in less time which allows us to offer it over a standard web browser with better performance and no installations as was required with Citrix," concluded Alexander Cuellar. The full article and screenshots of the system are available here.

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• Broken web interface in WRT54G router

  - by asmo

  I flashed my WRT54G (v3) from a custom firmware to the lastest Linksys one (v4.21.1) Now the internet/LAN works fine, but the web interface (http://192.168.1.1/) shows broken pages. I tried to manually navigating to the firmware upgrade page (by entering its URL), but it is broken too and not working. I tried a 30/30/30 reset twice, but the broken web interface still shows up. I tried to flash using the tftp2.exe application, which told me that the router didn't respond to the request. I tried to flash using the Windows commandline TFTP protocol, but I don't know how to supply a password on this prococol. (there is a factory default password ("admin") which I can't remove since the web interface is broken)

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• LAMP Server without single failure point + Global Server Load Balancing?

  - by José Nobile

  I want implement a LAMP Server (Linux Apache MySQL PHP) without a single failure point and with Global Server Load Balancing. I have a server in Cali, Colombia, and other server will be installed in Melbourne, Australia, user in America can use the Cali Server and in Europe, Asia, Africa or Oceania use the Melbourne Server. If any server fail (or load is excessively high), a server must answer all request. Data in MYSQL must be in sync, php files, any configuration in both server must be in sync. I read about of Google DNS Server 8.8.8.8 and 8.8.4.4 and ANY Cast, also about MySQL semisynchronous replication and MySQL Cluster, but what about other things, as crontabs, and the configurations in server? The solution can't depend of APNIC or BGP, only open source software running in Linux.

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• can not connect via SSH to a remote Postgresql database

  - by tartox

  I am trying to connect via pgAdmin3 GUI to a Postgresql database on a remote server myHost on port 5432. Server side : I have a Unix myUser that match a postgresql role. pg_hba.conf is : local all all trust host all all 127.0.0.1/32 trust Client side : I open an ssh tunnel : ssh -L 3333:myHost:5432 myUser@myHost I connect to the server via pgAdmin3 ( or via psql -h localhost -p 3333 ). I get the following error message : server closed the connection unexpectedly This probably means the server terminated abnormally before or while processing the request. I have tried to access a specific database with the superuser role using psql -h localhost -p 3333 --dbname=myDB --user=mySuperUser with no more success. What did I forget in the setup ? Thank you

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• nodejs server hanging from time to time

  - by Johann Philipp Strathausen

  I have a node server (0.6.6) running an Express application, along with Mongoose and s3, on an Ubuntu 11.04 machine. Several times per hour, the server is hanging. That means that the application is working fine, I see the express loggings, and then all of a sudden the server stops responding. No errors, no traces, no loggings, and strangely enough the browser won't show the request even in the network debugging window. From any machine in the local network it's the same behaviour. I restart the server and it's okay again for several minutes, then again starts to hang, everytime while doing something different. The same application on Amazon on the same Ubuntu version works fine and never hangs. I know all this is kind of vague, but I don't know where to start. Has any of you seen something like this before? Any idea?

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• Build vs Rebuild

  - by prash

  Build means compile and link only the source files that have changed since the last build, while Rebuild means compile and link all source files regardless of whether they changed or not. Build is the normal thing to do and is faster. Sometimes the versions of project target components can get out of sync and rebuild is necessary to make the build successful. In practice, you never need to Clean. Build or Rebuild Solution builds or rebuilds all projects in the your solution, while Build or Rebuild <project name> builds or rebuilds the StartUp project. To set the StartUp project, right click on the desired project name in the Solution Explorer tab and select Set as StartUp project. The project name now appears in bold. Compile just compiles the source file currently being edited. Useful to quickly check for errors when the rest of your source files are in an incomplete state that would prevent a successful build of the entire project. Ctrl-F7 is the shortcut key for Compile. All source files that have changed are saved when you request a build/rebuild, so you don't have to save them first. When you run your executable (F5 or Ctrl-F5), Visual Studio saves all your changed source files and builds anything that changed, so you don't need to explicitly do those steps every time. This allows for quick "trial and error" debugging. Incidentally, if you like those little Visual Studio keyboard shortcuts, you can download posters of the C# and the VB.Net ones, respectively (I am personally a big fan of using keyboard shortcuts :) ).   Visual Studio 2010 http://www.microsoft.com/downloads/en/details.aspx?FamilyID=92ced922-d505-457a-8c9c-84036160639f   Visual Studio 2005 C#: http://www.microsoft.com/downloads/details.aspx?FamilyID=c15d210d-a926-46a8-a586-31f8a2e576fe&DisplayLang=en VB.NET: http://www.microsoft.com/downloads/details.aspx?FamilyID=6bb41456-9378-4746-b502-b4c5f7182203&DisplayLang=en

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• VMware two vSwitches Guests can't communicate between them

  - by Aaron R.

  I have some servers in this configuration: And I am not able, from VMGuest1, to ping either VMGuest3 or VMGuest4. I can, however, ping Host1 and Host2, which are attached to pSwitch1. The behavior is the same with VMGuest3 or 4 trying to ping VMGuest 1 or 2. I don't have promiscuity enabled for any of these switches, nor do I have a bridge set up inside ESXi for the virtual switches. I know that one of these options is usually necessary when trying to get connectivity between two virtual switches. These switches are connected, however, through their respective physical switches which are bridged together. Ping just times out, arp request looks like this: [root@vmguest1:~]# arp -a vmguest3 vmguest3.example.com (1.2.3.4) at <incomplete> on eth0 [root@vmguest1:~]# arp -a host1 host1.example.com (1.2.3.5) at 00:0C:64:97:1C:FF [ether] on eth0 VMGuest1 can reach hosts on pSwitch1, so why can't it get to hosts on vSwitch1 through pSwitch1 the same way?

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• Production Instance : CLOSE_WAIT Connection Issue

  - by rajnikant

  I am using 10EC2 Instances behind 1 ELB. And ELB configured 80 to 8080 and 443 to 8080 port. And all 10EC2 instances having installed with Apache Tomcat, total request on ELB around 8000 to 10000 in 1 minute. I am facing problem for CLOSE_WAIT connection on 10 EC2 Instance, having Apache Tomcat. EC2 Instance Type : m1.xlarge When we restart the Apache Tomcat, all CLOSE_WAIT connections are lost, but its not proper way to work on Production Instances. Please help me out.

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• How to tune touchpad for smaller area?

  - by M.L.

  I just purchased the Asus Zenbook UX31A and I require some advice regarding tuning the touchpad. Basically my problem is that the mouse buttons are withing the touch area and I would like it to be disabled. Such that only part of the touch area is recognized. I have attached an image to clarify the idea. Basically only the red area in the image should be recognized. I have two reasons for this request. Firstly, I like to hold my thumb on the mouse button instead of holding it in the air. This is problematic, because touchpad thinks that I'm trying some kind of two finger gesture all the time and cursor stops moving. Clicking is also problematic since every finger movement -- regardless of how insignificant it might be -- on the "button" will move the cursor. I have been playing with some synclient settings like AreaBottomEdge etc. They have some effect but then I cannot highlight text or right button stops working. How could I solve this?

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• Can only access asp.net app on localhost

  - by Kevin Donn

  I'm trying to get an asp.net application up on IIS on a Windows Server 2008 machine. I can hit the app from localhost, no problem. But I can't access the app using the server's domain name either locally or from another machine on the network. But here's the odd part. I can access a normal file on IIS using the domain name, both from a browser running on the server and from a browser running on another machine on the network. Here's a synopsis ("http" converted to "htp" below because I don't have enough points to have all these links in my message): From IE on the server itself: works htp://localhost/foo.htm works htp://localhost/App works htp://test.foo.com/foo.htm dead htp://test.foo.com/App From IE on another machine (inside or outside my subnet): works htp://test.foo.com/foo.htm dead htp://test.foo.com/App And when I say "dead" I mean the request times out. Any ideas?

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• http server connectivity puzzle

  - by jpmartins

  I have been seeing some strange connection issue in the production environment. The setup has two IBM Http Server's (IHS) and a network IP load-balancer in front of them (round-robin). One instance the system is working fine, the next requests stop arriving at the IHS. Telnet directly to port 80 of the IHS is established sucessfully, but connection to the port 80 through the IP of the load-balancer fails! The puzzle comes next, the network admins say the load-balancer is working fine. When we finally reboot the IHS servers and request start flowing... The situation happened three times the last month and no obvious pattern was found. Any debug ideas?

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• apache and ajp performance

  - by user12145

  I have an apache sitting in front of two tomcat app servers(one on the same physical server, the other on a different one) that does time consuming work(0.5 sec to 10sec per request). The apache http server is getting killed by an average of 1 to 2 concurrent requests per second. both Server spec is about 2GB of RAM. Is there a way to optimize apache to handle the load? any advise is welcome. BalancerMember ajp://localhost:8009/xxxxxx BalancerMember ajp://XXX.XX.XXX.XX:8009/xxxxxx I keep getting the following in apache2.2 log: [Mon Dec 28 00:31:02 2009] [error] ajp_read_header: ajp_ilink_receive failed [Mon Dec 28 00:31:02 2009] [error] (120006)APR does not understand this error code: proxy: read response failed from 127.0.0.1:8009 (localhost)

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• ArchBeat Link-o-Rama for 2012-09-12

  - by Bob Rhubart

  15 Lessons from 15 Years as a Software Architect | Ingo Rammer In this presentation from the GOTO Conference in Copenhagen, Ingo Rammer shares 15 tips regarding people, complexity and technology that he learned doing software architecture for 15 years. Adding a runtime picker to a taskflow parameter in WebCenter | Yannick Ongena Oracle ACE Yannick Ongena shows how to create an Oracle WebCenter popup to allow users to "select items or do more complex things." Oracle Identity Manager 11g R2 Catalog | Daniel Gralewski Oracle Fusion Middleware A-Team blogger Daniel Gralewski shares a detailed overview of the new Catalog feature, one of the most talked about features in the latest release of Oracle Identity Manager 11g. Cloud API and service designers, stop thinking small | Cloud Computing - InfoWorld "The focus must shift away from fine-grained APIs that provide some type of primitive service, such as pushing data to a block of storage or perhaps making a request to a cloud-rooted database," says InfoWorld's David Linthicum. "To go beyond primitives, you must understand how these services should be used in a much larger architectural context. In other words, you need to understand how businesses will employ these services to form real workplace solutions -- inside and outside the enterprise." Oracle Solaris 8 P2V with Oracle database 10.2 and ASM | Orgad Kimchi Orgad Kimchi's technical post illustrates the migration of "a Solaris 8 physical system, with Oracle database version 10.2.0.5 with ASM file-system located on a SAN storage, into a Solaris 8 branded zone inside a Solaris 10 guest domain on top of a Solaris 11 control domain." Thought for the Day "The hardest single part of building a software system is deciding precisely what to build. " — Fred Brooks Source: SoftwareQuotes.com

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• Microsoft CA certificate templates expires sooner than expected

  - by Tim Brigham

  The certificates my Microsoft CA is generating do not match the time period indicated in the template used. How can I resolve this? I recently created a new certificate template for use on my Linux boxes on my Microsoft CA (2008 R2 Enterprise). This template is approved for server and client authentication purposes with a validity period of 10 years - the expected lifetime of our Linux boxes - and the subject name supplied in the request. I have checked both the intermediate and offline CA - both have more than 10 years of life listed. Is there some kind of hard limit I'm hitting here?

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• Funnelling http traffic

  - by spencer p

  I have a situation where a large batch of servers (X), on demand, need to request data from a smaller set of web servers (Y). The worst case scenario is if all servers in X decide to fetch different requests to one server in Y. That would be X amount of connections, which could be a very large burst of traffic. The best case scenario is if 1 server in X hit 1 server in Y in tandem. Life does not work like this. One idea to entertain is placing a proxy, similar to squid between X and Y. All of X servers can connect to this proxy, but would result in a few persistent (http keepalive) connections to Y. If The few were say, 3 or 4, then it would funnel. If we could then rate limit those connections and traffic decides to spike unusually high, we wouldn't hurt anyone but ourselves. Thoughts?

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• Threading models when talking to hardware devices

  - by Fuzz

  When writing an interface to hardware over a communication bus, communications timing can sometimes be critical to the operation of a device. As such, it is common for developers to spin up new threads to handle communications. It can also be a terrible idea to have a whole bunch of threads in your system, an in the case that you have multiple hardware devices you may have many many threads that are out of control of the main application. Certainly it can be common to have two threads per device, one for reading and one for writing. I am trying to determine the pros and cons of the two different models I can think of, and would love the help of the Programmers community. Each device instance gets handles it's own threads (or shares a thread for a communication device). A thread may exist for writing, and one for reading. Requested writes to a device from the API are buffered and worked on by the writer thread. The read thread exists in the case of blocking communications, and uses call backs to pass read data to the application. Timing of communications can be handled by the communications thread. Devices aren't given their own threads. Instead read and write requests are queued/buffered. The application then calls a "DoWork" function on the interface and allows all read and writes to take place and fire their callbacks. Timing is handled by the application, and the driver can request to be called at a given specific frequency. Pros for Item 1 include finer grain control of timing at the communication level at the expense of having control of whats going on at the higher level application level (which for a real time system, can be terrible). Pros for Item 2 include better control over the timing of the entire system for the application, at the expense of allowing each driver to handle it's own business. If anyone has experience with these scenarios, I'd love to hear some ideas on the approaches used.

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• Product Support News for Oracle Solaris, Systems, and Storage

  - by user12244613

  Hi System Support Customers, April Newsletter is now available The April, 2012 Newsletter for Oracle Solaris, Systems, and Storage is now available via document 1363390.1 *Requires a My Oracle Support account to access. Please take a few minutes to read the newsletter. The newsletter is the primary method of communication about what we in support would like you to be aware of. If you are not receiving the newsletter, it could be due to: (a) Your Oracle profile does not have the allow Oracle Communication selected (on oracle.com Sign In, or if logged in select "Account" and under your Job Role, check you have selected this box : [ ] Yes, send me e-mails in Oracle Products.... (b) you have not logged a service request during the last 12 months. Oracle is working to improve the distribution process and changes are coming and once they are ready I will write more about that. But today if you don't automatically receive the newsletter all you can do is save it as a favorite within My Oracle Support and come back on the 2nd of each month to check out the changes. This month I am really interested to find out from you is the Newsletter providing you the type of items that you are interested in. To gather some data on that, I have a small 2minute survey running on the newsletter or you can access it [ here ] Finally, if you think I am missing a topic in the Newsletter, let me know by taking the survey or suggesting a topic via this blog. Get Proactive Don't forget about being Proactive. The latest updates for Systems and Solaris pages in the Get Proactive area are now available. Check out document 432.1 and learn what proactive features are available for Systems and Solaris.

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