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  • apt-get not working

    - by Dave Daniels
    Everything I try with apt-get fails. I am installing Ubuntu server for the first time. It is version 12.04 LTS. When I run: apt-get update I get failed to fetch http://gb.whatever goes here...... If I run apt-get install install build-essential I get "unable to locate package build-essential" I have looked at the sources.list but do not know what should and shouldn't be in there. This is the current content of sources.list: # See help.ubuntu.com/community/UpgradeNotes for how to upgrade to # newer versions of the distribution. deb http://gb.archive.ubuntu.com/ubuntu precise main restricted deb-src http://gb.archive.ubuntu.com/ubuntu precise main restricted ## Major bug fix updates produced after the final release of the ## distribution. deb http://gb.archive.ubuntu.com/ubuntu precise-updates main restricted deb-src http://gb.archive.ubuntu.com/ubuntu precise-updates main restricted

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  • What are the packages/libraries I should install before compiling Python from source?

    - by Lennart Regebro
    Once in a while I need to install a new Ubuntu (I used it both for desktop and servers) and I always forget a couple of libraries I should have installed before compiling, meaning I have to recompile, and it's getting annoying. So now I want to make a complete list of all library packages to install before compiling Python (and preferably how optional they are). Off the top of my head I can remember these: build-essential (obviously) libz-dev (also pretty common and essential) libreadline-dev (or the Python prompt is crap) But I know there are many more. Please tell me and I'll update.

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  • How to avoid getting carried away with details?

    - by gablin
    When I program, I often get too involved with details. There might be some little thing that doesn't do exactly what I want it to, or maybe there's some little feature I want to add. Either way, none are really essential to the application - it's just a minor niusance (if any). However, when trying to fix it, I may happen to spend way more time on it than I planned, and there are things much more important that I should be doing instead of dealing with this little detail. What can I do to avoid getting carried away with details, when there's more essential things that need doing? (I didn't know how to tag this question, so feel free to add whatever appropriate tags that are missing.)

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  • HTG Explains: How Antivirus Software Works

    - by Chris Hoffman
    Antivirus programs are powerful pieces of software that are essential on Windows computers. If you’ve ever wondered how antivirus programs detect viruses, what they’re doing on your computer, and whether you need to perform regular system scans yourself, read on. An antivirus program is an essential part of a multi-layered security strategy – even if you’re a smart computer user, the constant stream of vulnerabilities for browsers, plug-ins, and the Windows operating system itself make antivirus protection important. 8 Deadly Commands You Should Never Run on Linux 14 Special Google Searches That Show Instant Answers How To Create a Customized Windows 7 Installation Disc With Integrated Updates

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  • Is there a usage count for packages or programs?

    - by math
    Motivation: I want to remove applications I do not use to speed up my package processing tasks like dist upgrades, regular updates, but also for saving disk space and other reasons. I know this is a complex topic so first I will ask my question and second I will give some answers I already found out. Question: How do I find out which package I did not used at all? For example I always use the VLC so I could remove totem package. (Which I could have been used some day, yes.) Of course package dependencies could force me to have programs installed which I will never use. Notes: Find the packages which consume much space via synaptic: Select "Status" in lower left, select "Installed" in upper left, sort column on "size" in upper right. Then you can decide which big packages you really need. Use aptitude autoremove Use ubuntu-tweak's Janitor for removing old kernel packages, old configs, apt-cache entries, etc. Manually search for applications for a given task that you usually solve with your standard app. E.g. Movie player, Music player, Office program, Browser etc. (BTW: this is what I want to be helped with my question) When removing packages I always favour "apt-get purge" over "aptitude remove --purge" as aptitude often will also remove essential packages due to package dependencies. E.g. when removing "evolution" (as I use thunderbird) aptitude wants to remove also "ubuntu-desktop" and 756 other packages as well, while apt-get just removes evolution and its helping pacakges like evolution-common. Ubuntu lense gives me most recent used applications which are candidates for keeping :) Employ deborphan as I read in this related answer: How do I clean up my harddrive? I should certainly keep essential packages: Keep only essential packages This question is pretty much a duplicate of How to see what installed packages I have never used for cleaning purposes but covering only few aspects. However one answer suggests to use a program called unusedpkg but the link seems down. There is also a program called Kleen http://code.google.com/p/kleen/ but it won't compile in 11.10. However I hacked it to compile but the results are unusable, as for example the g++ package was marked as not used for 203, but actually I used it seconds ago for compiling Kleen itself ;) So don't use this tool. On http://wiki.debian.org/DebianPackageInformation I read the the package popularity-contest will produce log files with usage statistics. Unfortunately I didn't enabled the popularity contest so I can't find this log file.

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  • SQL SERVER – Video – Beginning Performance Tuning with SQL Server Execution Plan

    - by pinaldave
    Traveling can be most interesting or most exhausting experience. However, traveling is always the most enlightening experience one can have. While going to long journey one has to prepare a lot of things. Pack necessary travel gears, clothes and medicines. However, the most essential part of travel is the journey to the destination. There are many variations one prefer but the ultimate goal is to have a delightful experience during the journey. Here is the video available which explains how to begin with SQL Server Execution plans. Performance Tuning is a Journey Performance tuning is just like a long journey. The goal of performance tuning is efficient and least resources consuming query execution with accurate results. Just as maps are the most essential aspect of performance tuning the same way, execution plans are essentially maps for SQL Server to reach to the resultset. The goal of the execution plan is to find the most efficient path which translates the least usage of the resources (CPU, memory, IO etc). Execution Plans are like Maps When online maps were invented (e.g. Bing, Google, Mapquests etc) initially it was not possible to customize them. They were given a single route to reach to the destination. As time evolved now it is possible to give various hints to the maps, for example ‘via public transport’, ‘walking’, ‘fastest route’, ‘shortest route’, ‘avoid highway’. There are places where we manually drag the route and make it appropriate to our needs. The same situation is with SQL Server Execution Plans, if we want to tune the queries, we need to understand the execution plans and execution plans internals. We need to understand the smallest details which relate to execution plan when we our destination is optimal queries. Understanding Execution Plans The biggest challenge with maps are figuring out the optimal path. The same way the  most common challenge with execution plans is where to start from and which precise route to take. Here is a quick list of the frequently asked questions related to execution plans: Should I read the execution plans from bottoms up or top down? Is execution plans are left to right or right to left? What is the relational between actual execution plan and estimated execution plan? When I mouse over operator I see CPU and IO but not memory, why? Sometime I ran the query multiple times and I get different execution plan, why? How to cache the query execution plan and data? I created an optimal index but the query is not using it. What should I change – query, index or provide hints? What are the tools available which helps quickly to debug performance problems? Etc… Honestly the list is quite a big and humanly impossible to write everything in the words. SQL Server Performance:  Introduction to Query Tuning My friend Vinod Kumar and I have created for the same a video learning course for beginning performance tuning. We have covered plethora of the subject in the course. Here is the quick list of the same: Execution Plan Basics Essential Indexing Techniques Query Design for Performance Performance Tuning Tools Tips and Tricks Checklist: Performance Tuning We believe we have covered a lot in this four hour course and we encourage you to go over the video course if you are interested in Beginning SQL Server Performance Tuning and Query Tuning. Reference: Pinal Dave (http://blog.SQLAuthority.com) Filed under: PostADay, SQL, SQL Authority, SQL Optimization, SQL Performance, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology, Video Tagged: Execution Plan

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  • Retrofit Certification

    - by Bill Evjen
    Impact of Regulations on Cabin Systems Installation John Courtright, Structural Integrity Engineering There are “heightened” FAA attention to technical issues related to IFE and Wi-Fi Systems Installations The Aging Aircraft Safety Rule – EWIS & Damage Tolerance Analysis The Challenge: Maximize Flight Safety While Minimizing Costs Issue Papers & Testing, Testing, Testing The role of Airworthiness Directives (ADs) on the design of many IFE systems and all antenna systems. Goal is safety AND cost-effective maintenance intervals and inspection techniques The STC Process Briefly Stated Type Certifications (TC) Supplemental Type Certifications (STC) The STC Process Project Specific Certification Plan (PSCP) Managed by FAA Aircraft Certification Office (ACO) Type of Project (Electrical/Mechanical Systems or Structural) Specific Type of Aircraft Being Modified Schedule Design & Installation Location What does the STC Plan (PSCP) Cover? System Description – What does the system do? System qualification – Are the components qualified? Certification requirements – What FARs are applicable? Installation detail – what is being modified? Prototype installation – What is new? Functional hazard Assessment (FHA) – is it safe? EZAP-EWIS Requirements – Any aging aircraft issues? Certification Data – How is compliance achieved? Delegation and FAA involvement – Who is doing the work? Proposed certification schedule – When is the installation? Certification documentation – What the FAA Expects to see Cabin Systems Certification Concerns In addition to meeting the requirements for DO-160, Cabin System Certification needs to address issues related to: Power management: Generally, IFE and Wi-Fi Systems are classified as “Non-Essential Equipment” from a certification viewpoint. Connected to “non-essential” power buses Must be able to shed IFE & Wi-Fi Systems in a smoke/fire event or Other electrical emergency (FAA Policy 00-111-160) FAA is more relaxed with testing wi-fi. It used to be that you had to have 150 seats with laptops running wi-fi, but now it is down to around 50. Aging aircraft concerns – electrical and structural Issue papers addressing technical concerns involving: “Structural Certification Criteria for Large Antenna Installations” Antenna “Vibration/Buffeting Compliance Criteria” DO-160 : Environmental Test Procedures DO 160 – “Environmental Conditions and Test Procedures for Airborne Equipment”, Issued by RTCA Provides guidance to equipment manufacturers as to testing requirements Temperature: –40C to +55C Vibration and Shock Contaminant susceptibility – fluids and dust Electro-magnetic Interference Cabin systems are generally classified as “non-essential” Swissair 111 crashed (in part) due to non-standard wiring practices. EWIS Design Implications Installation design must take EWIS Requirements into account. This generally means: Aircraft surveys are needed to identify proper wire routing Ensure existing wiring diagrams are correct Identify primary/Secondary/Tertiary bus locations Verify proper separation of wire bundles exist Required separation from fuel quantity indicator system (FQIS) to prevent fuel tang ignition Enhanced Zonal Analysis Procedure (EZAP) Performed EZAP was developed by the Aging Transport Systems Rulemaking Advisory Committee (ATSRAC) EZAP is the method for analyzing airplane zones with an emphasis on evaluating wiring systems and the existence of combustibles  in the cabin. Certification Considerations for Wi-Fi Systems Electrical – All existing DO 160 testing required Issue papers required Onboard EMI testing – any interference with aircraft systems when multiple wi-fi users are logged on? Vibration/Buffeting compliance criteria – what is the effect of the antenna on aircraft flight characteristics? Structural certification criteria – what are the stress loads on the aircraft at the antenna location and what is the impact on maintenance inspection criteria for the airline? Damage tolerance analysis required Goal – minimize maintenance inspection intervals

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  • Extreme Makeover, Phone Edition: Comcasts xfinity

    Mobile Makeover For many companies the first foray into Windows Phone 7 (WP7) may be in porting their existing mobile apps. It is tempting to simply transfer existing functionality, avoiding the additional design costs. Readdressing business needs and taking advantage of the WP7 platform can reduce cost and is essential to a successful re-launch. To better understand the advantage of new development lets examine a conceptual upgrade of Comcasts existing mobile app. Before Comcast has a great mobile app that provides several key features. The ability to browse the lineup using a guide, a client for Comcast email accounts, On Demand gallery, and much more. We will leverage these and build on them using some of the incredible WP7 features.   After With the proliferation of DVRs (Digital Video Recorders) and a variety of media devices (TV, PC, Mobile) content providers are challenged to find creative ways to build their brands. Every client touch point must provide both value added services as well as opportunities for marketing and up-sale; WP7 makes it easy to focus on those opportunities. The new app is an excellent vehicle for presenting Comcasts newly rebranded TV, Voice, and Internet services. These services now fly under the banner of xfinity and have been expanded to provide the best experience for Comcast customers. The Windows Phone 7 app will increase the surface area of this service revolution.   The home menu is simplified and highlights Comcasts Triple Play: Voice, TV, and Internet. The inbox has been replaced with a messages view, and message management is handled by a WP7 hub. The hub presents emails, tweets, and IMs from Comcast and other viewers the user follows on Twitter.  The popular view orders shows based on the users viewing history and current cable package. The first show Glee is both popular and participating in a conceptual co-marketing effort, so it receives prime positioning. The second spot goes to a hit show on a premium channel, in this example HBOs The Pacific, encouraging viewers to upgrade for this premium content. The remaining spots are ordered based on viewing history and popularity. Tapping the play button moves the user to the theatre where they can watch previews or full episodes streaming from Fancast. Tapping an extra presents the user with show details as well as interactive content that may be included as part of co-marketing efforts. Co-Marketing with Dynamic Content The success of Comcasts services are tied to the success of the networks and shows it purveys, making co-marketing efforts essential. In this concept FOX is co-marketing its popular show Glee. A customized panorama is updated with the latest gleeks tweets, streaming HD episodes, and extras featuring photos and video of the cast. If WP7 apps can be dynamically extended with web hosted .xap files, including sandboxed partner experiences would enable interactive features such as the Gleek Peek, in which a viewer can select a character from a panorama to view the actors profile. This dynamic inline experience has a tailored appeal to aspiring creatives and is technically possible with Windows Phone 7.   Summary The conceptual Comcast mobile app for Windows Phone 7 highlights just a few of the incredible experiences and business opportunities that can be unlocked with this latest mobile solution. It is critical that organizations recognize and take full advantage of these new capabilities. Simply porting existing mobile applications does not leverage these powerful tools; re-examining existing applications and upgrading them to Windows Phone 7 will prove essential to the continued growth and success of your brand.Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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  • What other protocols must not be fire-walled for FTP to work?

    - by Chris
    my Netgear router randomly reset itself the other day loosing all of my config settings: DSL details, Firewall rules, the lot! So I set about restoring all of the details manually, but when it came to configuring the firewall I wanted improve the security by explicitly setting 'deny' rules for everything that I figured is 'non-essential', and (although not necessary) whilst I was at it I set explicit 'allow' for the 'essential' protocols. I'll admit now I didn't really know what I was doing and everything was just 'my best guess', but I enabled only DNS, HTTP, HTTPS, FTP, SFTP, TFTP with everything else blocked. This did not work for me as I could not access 99% of web sites (although strangely Google worked!), so I played around a bit more and found that (oddly) if I disabled just the explicit 'allow' rules then everything worked fine, for browsing anyway. Today I came to work on some web-sites via FTP and just could not get a consistent connection, it kept dropping out after a few files or being blocked by the server or simply not connecting. It would authenticate okay but then stop when retrieving the initial directory listing! e.g.: Status: Delaying connection for 1 second due to previously failed connection attempt... Status: Resolving address of ftp.domain.co.uk Status: Resolving address of ftp.domain.co.uk Status: Connecting to 123.123.123.123:21... Status: Connecting to 123.123.123.123:21... Status: Connection established, waiting for welcome message... Status: Connection established, waiting for welcome message... Response: 421 Too many connections (8) from this IP Error: Could not connect to server Status: Delaying connection for 5 seconds due to previously failed connection attempt... Response: 421 Too many connections (8) from this IP Error: Could not connect to server Status: Delaying connection for 5 seconds due to previously failed connection attempt... I've checked and re-checked the FTP settings (they worked before anyway), I have Googled the I.T. out of the various protocols that I have blocked in the fire-wall but none seem essential to FTP (other than FTP/SFTP etc. which I have passively enabled). I'm (clearly) no server engineer, or protocols / fire-wall expert so I was hoping that some one could maybe shed some light on why my FTP is failing. I've been wondering if I ought to be allowing BGP, BOOTP and/or IDENT (or any others)? What other protocols are required for FTP? Thanks in advance!

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  • Securing RDP access to Windows Server 2008 R2: is Network Level Authentication enough?

    - by jamesfm
    I am a dev with little admin expertise, administering a single dedicated web server remotely. A recent independent security audit of our site recommended that "RDP is not exposed to the Internet and that a robust management solution such as a VPN is considered for remote access. When used, RDP should be configured for Server Authentication to ensure that clients cannot be subjected to man-in-the-middle attacks." Having read around a bit, it seems like Network Level Authentication is a Good Thing so I have enabled the "Allow connections only from Remote Desktop with NLA" option on the server today. Is this acion enough to mitigate the risk of a Man-in-the-Middle attack? Or are there other essential steps I should be taking? If VPN is essential, how do I go about it?

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  • Unavailable repository

    - by katrina
    I am new to Ubuntu and keep butting up against errors, such as this: Package libpng12-dev is not available, but is referred to by another package. This may mean that the package is missing, has been obsoleted, or is only available from another source However the following packages replace it: libpng12-0 E: Unable to locate package subversion E: Package 'git-core' has no installation candidate E: Package 'build-essential' has no installation candidate E: Package 'autoconf' has no installation candidate E: Package 'libtool' has no installation candidate E: Unable to locate package libxml2-dev E: Unable to locate package libgeos-dev E: Unable to locate package libpq-dev E: Unable to locate package libbz2-dev E: Package 'proj' has no installation candidate E: Unable to locate package munin-node E: Unable to locate package munin E: Unable to locate package libprotobuf-c0-dev E: Unable to locate package protobuf-c-compiler E: Unable to locate package libfreetype6-dev E: Package 'libpng12-dev' has no installation candidate E: Unable to locate package libtiff4-dev E: Unable to locate package libicu-dev E: Unable to locate package libboost-all-dev E: Unable to locate package libgdal-dev E: Unable to locate package libcairo-dev E: Unable to locate package libcairomm-1.0-dev E: Couldn't find any package by regex 'libcairomm-1.0-dev' E: Unable to locate package apache2 E: Unable to locate package apache2-dev E: Unable to locate package libagg-dev when I want to do this: sudo apt-get install subversion git-core tar unzip wget bzip2 build-essential autoconf libtool libxml2-dev libgeos-dev libpq-dev libbz2-dev proj munin-node munin libprotobuf-c0-dev protobuf-c-compiler libfreetype6-dev libpng12-dev libtiff4-dev libicu-dev libboost-all-dev libgdal-dev libcairo-dev libcairomm-1.0-dev apache2 apache2-dev libagg-dev. Any help or advice would be greatly appreciated. Or referrals to other questions...

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  • Can't install TeamViewer on Ubuntu 12.04

    - by Roel
    I have a Dell Inspiron 6400 laptop. I was a Windows user but I want to start using Ubuntu from now on. Everything goes well except installation of the teamviewer. I have downloaded the file from the official website. There, it says that just double click on the *.deb file and it will install it automatically. Well, it gives an error: Failed to remove essential system package, You requested to remove a package which is an essential part of your system. Then I tried the second way of installation, which is on the terminal. I types as suggested: sudo dpkg -i teamviewer_linux.deb. It started installing but later on failed. HEre is the copy of the screen. Preparing to replace teamviewer7:i386 7.0.9377 (using teamviewer_linux.deb) ... Unpacking replacement teamviewer7:i386 ... dpkg: dependency problems prevent configuration of teamviewer7:i386: teamviewer7:i386 depends on bash (>= 3.0). teamviewer7:i386 depends on libc6 (>= 2.7). teamviewer7:i386 depends on libasound2. teamviewer7:i386 depends on zlib1g. teamviewer7:i386 depends on libxext6. dpkg: error processing teamviewer7:i386 (--install): dependency problems - leaving unconfigured Errors were encountered while processing: teamviewer7:i386 I have already checked these dependent files in Synaptic and they are all installed. What am I doing wrong?

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  • How to run 'apt-get install' to install all dependencies?

    - by michael
    I am running this in ubuntu server installation: sudo apt-get install git-core gnupg flex bison gperf build-essential \ zip curl libc6-dev libncurses5-dev:i386 x11proto-core-dev \ libx11-dev:i386 libreadline6-dev:i386 libgl1-mesa-glx:i386 \ libgl1-mesa-dev g++-multilib mingw32 openjdk-6-jdk tofrodos \ python-markdown libxml2-utils xsltproc zlib1g-dev:i386 but I am getting this: Reading package lists... Building dependency tree... Reading state information... curl is already the newest version. gnupg is already the newest version. Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: build-essential : Depends: gcc (>= 4:4.4.3) but it is not going to be installed Depends: g++ (>= 4:4.4.3) but it is not going to be installed g++-multilib : Depends: cpp (>= 4:4.7.2-1ubuntu2) but it is not going to be installed Depends: gcc-multilib (>= 4:4.7.2-1ubuntu2) but it is not going to be installed Depends: g++ (>= 4:4.7.2-1ubuntu2) but it is not going to be installed Depends: g++-4.7-multilib (>= 4.7.2-1~) but it is not going to be installed How can I fix this?

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  • I'm trying to install VMWare tools on Ubuntu 12.04.2 LTS and I seem to have a problem with Kernel headers

    - by Pedro Irusta
    I have Ubuntu 12.04.2 LTS installed on a VMware machine on Windows 7 host. I seem to have a problem with Kernel headers when trying to install them I did: sudo apt-get install gcc make build-essential linux-headers-$(uname -r) Reading package lists... Done Building dependency tree Reading state information... Done gcc is already the newest version. build-essential is already the newest version. linux-headers-3.5.0-28-generic is already the newest version. make is already the newest version. 0 upgraded, 0 newly installed, 0 to remove and 100 not upgraded. However, when installing VMware tools I get the following error: make[1]: Entering directory `/usr/src/linux-headers-3.5.0-28-generic' CC [M] /tmp/vmware-root/modules/vmhgfs-only/backdoor.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/backdoorGcc32.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/bdhandler.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/cpName.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/cpNameLinux.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/cpNameLite.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/dentry.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/dir.o CC [M] /tmp/vmware-root/modules/vmhgfs-only/file.o /tmp/vmware-root/modules/vmhgfs-only/file.c:122:4: warning: initialization from incompatible pointer type [enabled by default] /tmp/vmware-root/modules/vmhgfs-only/file.c:122:4: warning: (near initialization for ‘HgfsFileFileOperations.fsync’) [enabled by default] CC [M] /tmp/vmware-root/modules/vmhgfs-only/filesystem.o /tmp/vmware-root/modules/vmhgfs-only/filesystem.c:48:28: fatal error: linux/smp_lock.h: No such file or directory compilation terminated. make[2]: *** [/tmp/vmware-root/modules/vmhgfs-only/filesystem.o] Error 1 make[1]: *** [_module_/tmp/vmware-root/modules/vmhgfs-only] Error 2 make[1]: Leaving directory `/usr/src/linux-headers-3.5.0-28-generic' make: *** [vmhgfs.ko] Error 2 make: Leaving directory `/tmp/vmware-root/modules/vmhgfs-only' Any help appreciated!

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  • What are the packages/libraries I should install before compiling Python from source?

    - by Lennart Regebro
    Once in a while I need to install a new Ubuntu (I used it both for desktop and servers) and I always forget a couple of libraries I should have installed before compiling, meaning I have to recompile, and it's getting annoying. So now I want to make a complete list of all library packages to install before compiling Python (and preferably how optional they are). This is the list I compiled with below help and by digging in setup.py. It is complete for Ubuntu 10.04 and 11.04 at least: build-essential (obviously) libz-dev (also pretty common and essential) libreadline-dev (or the Python prompt is crap) libncursesw5-dev libssl-dev libgdbm-dev libsqlite3-dev libbz2-dev More optional: tk-dev libdb-dev Ubuntu has no packages for v1.8.5 of the Berkeley database, nor (for obvious reasons) the Sun audio hardware, so the bsddb185 and sunaudiodev modules will still not be built on Ubuntu, but all other modules are built with the above packages installed. Python 2.5 and Python 2.6 also needs to have LDFLAGS set on Ubuntu 11.04 and later, to handle the new multi-arch layout: export LDFLAGS="-L/usr/lib/$(dpkg-architecture -qDEB_HOST_MULTIARCH)" For Python 2.6 and 2.7 you also need to explicitly enable SSL after running the ./configure script and before running make. In Modules/Setup there are lines like this: #SSL=/usr/local/ssl #_ssl _ssl.c \ # -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \ # -L$(SSL)/lib -lssl -lcrypto Uncomment these lines and change the SSL variable to /usr: SSL=/usr _ssl _ssl.c \ -DUSE_SSL -I$(SSL)/include -I$(SSL)/include/openssl \ -L$(SSL)/lib -lssl -lcrypto Python 2.6 also needs Modules/_ssl.c modified to be used with OpenSSL 1.0, which is used in Ubuntu 11.10. At around line 300 you'll find this: else if (proto_version == PY_SSL_VERSION_SSL3) self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */ else if (proto_version == PY_SSL_VERSION_SSL2) self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */ else if (proto_version == PY_SSL_VERSION_SSL23) self->ctx = SSL_CTX_new(SSLv23_method()); /* Set up context */ Change that into: else if (proto_version == PY_SSL_VERSION_SSL3) self->ctx = SSL_CTX_new(SSLv3_method()); /* Set up context */ #ifndef OPENSSL_NO_SSL2 else if (proto_version == PY_SSL_VERSION_SSL2) self->ctx = SSL_CTX_new(SSLv2_method()); /* Set up context */ #endif else if (proto_version == PY_SSL_VERSION_SSL23) self->ctx = SSL_CTX_new(SSLv23_method()); /* Set up context */ This disables SSL_v2 support, which apparently is gone in OpenSSL1.0.

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  • Can One Get a Solid Programming Foundation Without Going To College/University?

    - by Daniel
    First, I have already searched the site and read all the previous "self-taught vs. college" topics. The majority of the answers defended that going to college was the best choice, for two main reasons: Going to college gives you the paper, which is essential to landing jobs, especially in tough economic times. Going to college gives you a solid programming base, teaching you the principles that will be essential regardless of the language/path you take after. Here comes my question: I am not worried about reason 1 at all, because I already have my own company (I build websites/ do affiliate marketing) and a stable financial situation, so I am pretty sure I won't need to look around for a job. I am worried about reason 2 though. That is, I want to make sure I'll have as solid a programming foundation as anyone else out there, and I am wondering if that is possible with self-learning. Suppose I take my time to study the very basics, like discrete maths, algorithm design, programming logic, computer architecture, Assembly, C programming, databases and data structures - mostly using books,online resources and lots of coding. Say I spend 1-2 years covering those basics. Do you think my foundation would be solid, or still lack in comparison to someone who went to college?

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  • Why is Windows registry needed?

    - by Job
    As I have debugged problems in com, side by side, dealt with dll hell, all while hating the windows registry with passion, I was wondering why is it needed. I never felt compelled to read an entire book on registry best practices, and then just "get it". I have, however, used Linux and Mac OS, and look at the ways one can install multiple versions of Python and its libraries on the same *nix computer. Because registry has somewhat of a free (albeit ugly) format, and is used for all sorts of purposes, I have never understood what essential problem it is trying to solve. For instance, Microsoft does not want you to have two different versions of MS Office installed side by side. They use registry to enforce this during installation. This limitation is artificial, in my opinion. If they really cared to allow a different behavior, they could have adjusted their architecture accordingly. In Mac OS you can install and remove apps by just dropping them into a particular folder. So, A) What essential problem it is trying to solve? B) How do other operating systems solve it?

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  • What's the best way to manage error logging for exceptions?

    - by Peter Boughton
    Introduction If an error occurs on a website or system, it is of course useful to log it, and show the user a polite message with a reference code for the error. And if you have lots of systems, you don't want this information dotted around - it is good to have a single centralised place for it. At the simplest level, all that's needed is an incrementing id and a serialized dump of the error details. (And possibly the "centralised place" being an email inbox.) At the other end of the spectrum is perhaps a fully normalised database that also allows you to press a button and see a graph of errors per day, or identifying what the most common type of error on system X is, whether server A has more database connection errors than server B, and so on. What I'm referring to here is logging code-level errors/exceptions by a remote system - not "human-based" issue tracking, such as done with Jira,Trac,etc. Questions I'm looking for thoughts from developers who have used this type of system, specifically with regards to: What are essential features you couldn't do without? What are good to have features that really save you time? What features might seem a good idea, but aren't actually that useful? For example, I'd say a "show duplicates" function that identifies multiple occurrence of an error (without worrying about 'unimportant' details that might differ) is pretty essential. A button to "create an issue in [Jira/etc] for this error" sounds like a good time-saver. Just to re-iterate, what I'm after is practical experiences from people that have used such systems, preferably backed-up with why a feature is awesome/terrible. (If you're going to theorise anyway, at the very least mark your answer as such.)

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  • How do I sell Oracle? It all starts with the database

    - by swiesner
    Partner sales reps often ask me how they start a conversation with their customers around Oracle. The first question should be, "are you running an Oracle database?" Much of what we do at Oracle is intended to optimize our customers' investments in the Oracle database. Many of our acquisitions, new features in existing products, new applications, are often designed to improve the experience of the 400,000 Oracle database customers worldwide. Once you find an Oracle database customer, the next set of questions are much easier, but depend on your expertise: License Management, Upsell, and Services. Let's start with License Management: Have there been any changes to your infrastructure since you purchased the database licenses? Have you upgraded the servers on which the Oracle database is running? Have the number of users or employees increased since the last license purchase? Yes to any of these questions will lead to investigating correct licensing. The goal is to provide a "soft" license review. Oracle generally does not require any license keys to install our software, so we need to help our customers with compliance. Correct licensing is essential to managing costs, and can provide a great way to efficiently manage IT spend. You might want to contact your local Oracle Channel Manager or VAD for licensing assistance. Or, review the Software Investment Guide. Naturally, these questions can lead to upsell opportunities. If your customer has invested in Oracle technology to manage their data, that data is essential to running their business. We'll take a look at those upsell questions in a later blog post.

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