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• Open an X application going through many hoops (SSH, vpn etc)

  - by ??O?????

  The players: my home computer, running Linux with an X server running. (Call it HOME.) a remote site, to which I can connect over the internet using a VPN. (SITE) a Linux computer at the remote site, to which I can connect with ssh -X and nicely have X clients displaying on my local server. (MIDDLE) a very old Irix machine (an Onyx) at the remote site, which has no SSH server (therefore I can't ssh -X to it), only an ssh client. (ONYX) Purpose I need to run an X11 application on the ONYX machine, and see the GUI on HOME. I think I stumble upon xauth issues. So far The current situation is: ? HOME connects to SITE ? A vncserver starts on MIDDLE:7 ? vncviewer on HOME connects to vncserver on MIDDLE ? ONYX starts a forwarding ssh session to MIDDLE: ssh -TfN -L 6007:127.0.0.1:6007 MIDDLE ? DISPLAY=localhost:7 xclient on ONYX fails with Xlib: connection to "127.0.0.1:7.0" refused by server I do know that the forwarding (6007:127.0.0.1:6007) succeeds. A previous attempt was: ? HOME connects to SITE ? HOME connects to MIDDLE: ssh -X MIDDLE (xclock displays on HOME, DISPLAY is 127.0.0.1:10) ? ONYX starts an SSH tunnel to MIDDLE: ssh -TfN -L 6010:127.0.0.1:6010 MIDDLE ? DISPLAY=127.0.0.1:10 xclient fails with X connection to 127.0.0.1:10.0 broken (explicit kill or server shutdown). while an error pops up in the MIDDLE session: X11 connection rejected because of wrong authentication. Despair How can I achieve my purpose?

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• Untar with date filter

  - by Don

  Is there any way to untar and only extract those files that are above a certain date including directory structure?? I restored a backup on a play server but it was a few days old. However I have a tar archive of the entire structure that is more up to date and healthy so now I want to extract all files (including directory structure) based on a date filter on the files if possible?

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• Nginx server 301 Moved permanently

  - by user145714

  When I did a curl -v http://site-wordpress.com:81 I received this result: About to connect() to site-wordpress.com port 81 (#0) Trying ip... connected Connected to site-wordpress.com (ip) port 81 (#0) GET / HTTP/1.1 User-Agent: curl/7.19.7 (x86_64-unknown-linux-gnu) libcurl/7.19.7 NSS/3.12.6.2 zlib/1.2.3 libidn/1.18 libssh2/1.2.2 Host: site-wordpress.com:81 Accept: / < HTTP/1.1 301 Moved Permanently < Server: nginx/1.2.4 < Date: Fri, 16 Nov 2012 16:28:19 GMT < Content-Type: text/html; charset=UTF-8 < Transfer-Encoding: chunked < Connection: keep-alive < X-Pingback: The URL above/xmlrpc.php < Location: The URL above Seems like this line in my fastcgi_params is causing grief. fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; If I remove this line , I get HTTP/1.1 200 OK but I get a blank page. This is my config: server { listen 81; server_name site-wordpress.com; root /var/www/html/site; access_log /var/log/nginx/access.log; error_log /var/log/nginx/error.log; index index.php; if (!-e $request_filename){ rewrite ^(.*)$ /index.php break; } location ~ \.php$ { fastcgi_pass 127.0.0.1:9000; # port where FastCGI processes were spawned fastcgi_index index.php; include /etc/nginx/fastcgi_params; include /etc/nginx/mime.types; } location ~ \.css { add_header Content-Type text/css; } location ~ \.js { add_header Content-Type application/x-javascript; } } This config works with ip and port 80. But now I need to use a domain name and port 81, which doesn't work. Could someone please help. Thanks.

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• Sharepoint: authenticating users via forms authentication

  - by sbee

  My problem is the following(sharepoint Newbie) , i want to change the default zone from being a Windows Authenticated Zone to a Forms Authenticated Zone ,thereby forcing the site collection administrator to log in via forms authentication and not windows also the sharepoint users will be accesing the site internally my goal is to effectively replace windows authentication with forms authentication as my company does not have active directory installed. So far i have created an ASP Application that adds the users to the database,the database was created via the .Net Framework Asp tool(Asp reg_sql),however when i change the default zone to the AspNetSqlMembershipProvider(Forms) and attempt to add my site collection administrator via the Central admistrator, i get the following error "No Exact Match found" as shown on the screenshot. My inkling is that somehow the people picker is failing to read the users from the database but reasearch on correcting that thus far has proved fruitless. I have made all the relevant changes on the these sites(Central admin site,My test site & Add Users site) config files.Changes are the following(Membeship Provider,Connection String,People Picker) i left out the role provider for now as it is optional. Help on this would ge highly appreciated...

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• Pulling application updates from closest server?

  - by Mike Morris

  Setup: 6 Major Sites with Server 2003/2008 DCs doing DHCP/AD Integrated DNS, each on their own subnet. All connect back to datacenter through a 3 mbps WAN ERP server running in the datacenter, accessed by clients at all sites Currently, when we update the software, I manually push a copy of the updated client/config files down to each DC. I have a script that we run on each PC to update the clients. It determines what subnet the PC is on, and pulls the software from that DC. It's messy, but it works. The client has an autoupdate feature, but it'll only pull from the application server (which is housed in the datacenter, over the 3 meg link). It takes forever, since the updates are not "patches" but a full version of the client, even for minor upgrades (bad design). After the most recent patch, you can configure the clients to pull from a different server. Unfortunately, it is the same for all clients. Is there some kind of DNS magic I can use to pull from the local server? For instance, if I tell the clients their update server is ERPUPDATE, can I have their local DNS server return a different IP for ERPUPDATE than the other sites? Example: Client 1 is at site A, client 2 is at site b. They each run the software and a version change is detected. As per the config files, the clients look to ERPUPDATE for their updated client. Client 1 queries DNS for the IP of ERPUPDATE at its current location (site A) DNS at site A returns 192.1.1.5 Client 1 pulls update from 192.1.1.5 Client 2 queries DNS for the IP of ERPUPDATE at its current location (site B) DNS at site B returns 192.1.2.5 Client 2 pulls update from 192.1.2.5 Excuse the poor explanation, I worked 61 hours over the weekend and haven't completely rebounded. I'll be happy to clarify if needed!

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• How best to handle end user notification in the event of system failure incl. email?

  - by BrianLy

  I've been asked to research ways of handling end user notifications when systems such as email are experiencing problems. Perhaps an example will make this a little clearer. We have a number of sites in different countries. Recently email was impacted at one of the sites, but it could have been a complete network outage. Information was provided by phone to local IT managers at the site but onward communication was slower than some would have liked. It seems like almost everyone at the site has a personal mobile phone which could receive text messages, and perhaps access a remote website with postings on the situation. However managing and supporting a system to text people on these relatively infrequent occasions would be very costly to do internally. What are other people doing to handle situations like this? Some things I've thought of include: Database of phone numbers to text. Seems costly and not very easy to maintain for an already stretched IT group. Is there an external service that would let you do this policies? Send voicemail message to all phones on site. Maintain an external website. This would not work in all situations (network failure), and there is a limit on the amount of info that can be posted externally. A site outage could be sensitive information in some situations. How could the site be password protected? Maybe OpenId/Facebook connect would work. Use a site like Yammer.com which is publicly accessible but only by people with a company email address. Anyone using this for IT outage notifications? To me it looks like there is no clear answer, and that there are solutions for some subsets of users. To be comprehensive a number of solutions would need to be combined. Any additional thoughts or recommendations? What worked or didn't work for your organization?

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• Directory service unavailiable, new hardware same settings

  - by Alex

  I'm working on a project with 2 sites connected by a VPN. Site 1 has the main server and there is a secondary server at site 2 which I am trying to replace. The current setup works perfectly however I can't for the life of me get the replacement server at site 2 up and running. I'm trying to replace like for like just upgraded hardware. I have installed the OS (all Server 2003 Standard SP2) and used exactly the same settings as the old server. I have setup Active Directory, DNS Server, DHCP Server and WINS Server configured. I have used all the same settings as the old server (except IP address and name). I can access the active directory but I can't do anything; add, edit, delete all returns "the directory service is unavaliable". No-one can login on any of the computers on site 2 and the internet is down. Plugging the old server back in and connecting it to the network rectifies the issue (so both new and old are connected at site 2), everyone can login and the internet is back (curious since the modem connects direct to the switch, and even with the new server online I can connect to the router via IP but not the net). I really don't have much experience but I've been roped into doing this because my company is too cheap to hire a real network admin. Any suggestions of where I can start to troubleshoot this, its driving me crazy and I only have a day before all the users are back on site.

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• Component Development within SOA

  How do the concepts of component development work within SOA? Let’s first break this question down by defining what component development is. Component development is the process of implementing specific functionality in the form of small units of complied code that can be reused across multiple applications or product families. Typically, components are integrated with other components forming composite components. In general, most interaction between components is done through interfaces to promote loose coupling. The concept of loose coupling refers to the interconnections of components in a system so that their component dependences based on contracts defined by interfaces. A real life example of this can be experienced while using Legos to build a structure. If we consider each Lego block as a component, then when two more Legos are connected they form a composite component due to the fact that the structure is made up of multiple components.   It is important to note that composite components can be made from standard components and other composite components. Eventually as various components and composite components become interconnected a structure begins to form in the shape of an application or in the case of Legos in the form of Lego structure. Software components can loosely be defined as small units of related implemented functionality that can communicate with other components or may have dependencies on other components. Based on the definitions provide above, it is my personal opinion that SOA works well with the concepts of component development. The SOA architectural style focuses on creating loosely coupled services. Each service much like a component offers related functionality that can be accessed by various requesting clients.  In addition services can be derived just like components in that services can be built on other services to form composite services. In summary, the concepts of component development can work within SOA based on the example above.

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• Design pattern for procedural terrain assets

  - by Alex

  I'm developing a procedural terrain class at the moment and am stuck on the correct design pattern. The terrain is 2D and is constructed from a series of (x,y) points. I currently have a method that just randomly adds points to an array of points to generate a random spread of points. However I need a more elaborate system for generating the terrain. The terrain will be built form a series of re-accuring terrain structures eg. a pit, jump, hill etc. Each structure will have some randomness assigned to it, each height of hill will be random, pit size will be random etc. Each terrain structure will have: A property detailing the number of points making up that structure A method for generating the points (not absolutely necessary) My current thinking is to have a class for each terrain structure, create a fixed amount of terrain elements ahead of the player, loop over these and add the corresponding points to the game. What is the best way to create these procedural terrain structures when they are ultimately just a set of functions for generating terrain elements? Is a class for each terrain element excessive? I'm developing the game for iphone so any objective-c related answers would be welcome.

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• Variant Management– Which Approach fits for my Product?

  - by C. Chadwick

  Jürgen Kunz – Director Product Development – Oracle ORACLE Deutschland B.V. & Co. KG Introduction In a difficult economic environment, it is important for companies to understand the customer requirements in detail and to address them in their products. Customer specific products, however, usually cause increased costs. Variant management helps to find the best combination of standard components and custom components which balances customer’s product requirements and product costs. Depending on the type of product, different approaches to variant management will be applied. For example the automotive product “car” or electronic/high-tech products like a “computer”, with a pre-defined set of options to be combined in the individual configuration (so called “Assembled to Order” products), require a different approach to products in heavy machinery, which are (at least partially) engineered in a customer specific way (so-called “Engineered-to Order” products). This article discusses different approaches to variant management. Starting with the simple Bill of Material (BOM), this article presents three different approaches to variant management, which are provided by Agile PLM. Single level BOM and Variant BOM The single level BOM is the basic form of the BOM. The product structure is defined using assemblies and single parts. A particular product is thus represented by a fixed product structure. As soon as you have to manage product variants, the single level BOM is no longer sufficient. A variant BOM will be needed to manage product variants. The variant BOM is sometimes referred to as 150% BOM, since a variant BOM contains more parts and assemblies than actually needed to assemble the (final) product – just 150% of the parts You can evolve the variant BOM from the single level BOM by replacing single nodes with a placeholder node. The placeholder in this case represents the possible variants of a part or assembly. Product structure nodes, which are part of any product, are so-called “Must-Have” parts. “Optional” parts can be omitted in the final product. Additional attributes allow limiting the quantity of parts/assemblies which can be assigned at a certain position in the Variant BOM. Figure 1 shows the variant BOM of Agile PLM. Figure 1 Variant BOM in Agile PLM During the instantiation of the Variant BOM, the placeholders get replaced by specific variants of the parts and assemblies. The selection of the desired or appropriate variants is either done step by step by the user or by applying pre-defined configuration rules. As a result of the instantiation, an independent BOM will be created (Figure 2). Figure 2 Instantiated BOM in Agile PLM This kind of Variant BOM  can be used for „Assembled –To-Order“ type products as well as for „Engineered-to-Order“-type products. In case of “Assembled –To-Order” type products, typically the instantiation is done automatically with pre-defined configuration rules. For „Engineered- to-Order“-type products at least part of the product is selected manually to make use of customized parts/assemblies, that have been engineered according to the specific custom requirements. Template BOM The Template BOM is used for „Engineered-to-Order“-type products. It is another type of variant BOM. The engineer works in a flexible environment which allows him to build the most creative solutions. At the same time the engineer shall be guided to re-use existing solutions and it shall be assured that product variants of the same product family share the same base structure. The template BOM defines the basic structure of products belonging to the same product family. Let’s take a gearbox as an example. The customer specific configuration of the gearbox is influenced by several parameters (e.g. rpm range, transmitted torque), which are defined in the customer’s requirement document.  Figure 3 shows part of a Template BOM (yellow) and its relation to the product family hierarchy (blue).  Figure 3 Template BOM Every component of the Template BOM has links to the variants that have been engineeried so far for the component (depending on the level in the Template BOM, they are product variants, Assembly Variant or single part variants). This library of solutions, the so-called solution space, can be used by the engineers to build new product variants. In the best case, the engineer selects an existing solution variant, such as the gearbox shown in figure 3. When the existing variants do not fulfill the specific requirements, a new variant will be engineered. This new variant must be compliant with the given Template BOM. If we look at the gearbox in figure 3  it must consist of a transmission housing, a Connecting Plate, a set of Gears and a Planetary transmission – pre-assumed that all components are must have components. The new variant will enhance the solution space and is automatically available for re-use in future variants. The result of the instantiation of the Template BOM is a stand-alone BOM which represents the customer specific product variant. Modular BOM The concept of the modular BOM was invented in the automotive industry. Passenger cars are so-called „Assembled-to-Order“-products. The customer first selects the specific equipment of the car (so-called specifications) – for instance engine, audio equipment, rims, color. Based on this information the required parts will be determined and the customer specific car will be assembled. Certain combinations of specification are not available for the customer, because they are not feasible from technical perspective (e.g. a convertible with sun roof) or because the combination will not be offered for marketing reasons (e.g. steel rims with a sports line car). The modular BOM (yellow structure in figure 4) is defined in the context of a specific product family (in the sample it is product family „Speedstar“). It is the same modular BOM for the different types of cars of the product family (e.g. sedan, station wagon). The assembly or single parts of the car (blue nodes in figure 4) are assigned at the leaf level of the modular BOM. The assignment of assembly and parts to the modular BOM is enriched with a configuration rule (purple elements in figure 4). The configuration rule defines the conditions to use a specific assembly or single part. The configuration rule is valid in the context of a type of car (green elements in figure 4). Color specific parts are assigned to the color independent parts via additional configuration rules (grey elements in figure 4). The configuration rules use Boolean operators to connect the specifications. Additional consistency rules (constraints) may be used to define invalid combinations of specification (so-called exclusions). Furthermore consistency rules may be used to add specifications to the set of specifications. For instance it is important that a car with diesel engine always is build using the high capacity battery.  Figure 4 Modular BOM The calculation of the car configuration consists of several steps. First the consistency rules (constraints) are applied. Resulting from that specification might be added automatically. The second step will determine the assemblies and single parts for the complete structure of the modular BOM, by evaluating the configuration rules in the context of the current type of car. The evaluation of the rules for one component in the modular BOM might result in several rules being fulfilled. In this case the most specific rule (typically the longest rule) will win. Thanks to this approach, it is possible to add a specific variant to the modular BOM without the need to change any other configuration rules.  As a result the whole set of configuration rules is easy to maintain. Finally the color specific assemblies respective parts will be determined and the configuration is completed. Figure 5 Calculated Car Configuration The result of the car configuration is shown in figure 5. It shows the list of assemblies respective single parts (blue components in figure 5), which are required to build the customer specific car. Summary There are different approaches to variant management. Three different approaches have been presented in this article. At the end of the day, it is the type of the product which decides about the best approach.  For „Assembled to Order“-type products it is very likely that you can define the configuration rules and calculate the product variant automatically. Products of type „Engineered-to-Order“ ,however, need to be engineered. Nevertheless in the majority of cases, part of the product structure can be generated automatically in a similar way to „Assembled to Order“-tape products.  That said it is important first to analyze the product portfolio, in order to define the best approach to variant management.

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• SQL to XML open data made simple

  - by drrwebber

  The perennial question for people is how to easily generate XML from SQL table content?  The latest CAM Editor release really tackles this head on by providing a powerful and simple toolset.  Firstly you can visually browse your SQL tables and then drag and drop from columns and tables into the XML structure editor.   This gives you a code-free method of describing the transformation you require.  So you do not need to know about the vagaries of XML and XSD schema syntax. Second you can map directly into existing industry domain XML exchange structures in the XML visual editor, again no need to wrestle with XSD schema, you have WYSIWYG visual control over what your output will look like. If you do not have a target XML structure and need to build one from scratch, then the CAM Editor makes this simple.  Switch the SQL viewer into designer mode, then take your existing SQL table and drag and drop it into the XML structure editor.  Automatically the XML wizard tool will take your SQL column names and definitions and create equivalent XML for you and insert the mappings. Simply save the structure template, and run the Open Data generator menu option, and your XML is built for you. Completely code-free template driven development. To see this in action, see our video demonstration links and then download the tools and samples and try it yourself.

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• Do input template languages exist?

  - by marczellm

  When I have to create some textual representation of data, I can use a template language, so that my code does not have to worry about the structure of the output file - I can sometimes even write code that's independent of whether the output is XML, LaTeX or any other plain text. A simple example: Template (in separate file): <someXmlTag> $variableName </someXmlTag> Code: Template(temstring).substitute(variableName="value") Result (written to output file): <someXmlTag> value </someXmlTag> I want to do the same, but in the opposite direction. I have XML or plain text or whatever files to input. I want to describe the input structure in a separate file that looks like the input but has these variable declarations in it, and I want to handle it with code that's independent of the structure. Is there a library for this concept? (We usually handle XML input by using an XML parser library to describe the input structure in program code, handle plaintext input by writing regexes in code, and don't handle LaTeX input because LaTeX can't really be parsed.)

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• Why won't ruby recognize Haml under ubuntu64 while using jekyll static blog generator?

  - by oldmanjoyce

  I have been trying, quite unsuccessfully, to run henrik's fork of the jekyll static blog generator on Ubuntu 64-bit. I just can't seem to figure this out and I've tried a bunch of different things. Originally I posted this over at stackoverflow, but this is probably the better spot for it. The base stats of my machine: Ubuntu 9.04, 64 bit, ruby 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux], rubygems 1.3.1. When I attempt to build the site, this is what happens: $ jekyll --pygments Configuration from ./_config.yml Using Sass for CSS generation You must have the haml gem installed first Using rdiscount for Markdown Building site: . - ./_site /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/core_ext.rb:27:in `method_missing': undefined method 'header' for #, page=# ..... cut ..... (NoMethodError) from (haml):9:in `render' from /home/chris/.gem/gems/haml-2.2.3/lib/haml/engine.rb:167:in 'render' from /home/chris/.gem/gems/haml-2.2.3/lib/haml/engine.rb:167:in 'instance_eval' from /home/chris/.gem/gems/haml-2.2.3/lib/haml/engine.rb:167:in 'render' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/convertible.rb:72:in 'render_haml_in_context' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/convertible.rb:105:in 'do_layout' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/post.rb:226:in 'render' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:172:in 'read_posts' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:171:in 'each' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:171:in 'read_posts' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:210:in 'transform_pages' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/../lib/jekyll/site.rb:126:in 'process' from /home/chris/.gem/gems/henrik-jekyll-0.5.2/bin/jekyll:135 from /home/chris/.gem/bin/jekyll:19:in `load' from /home/chris/.gem/bin/jekyll:19 I added spaces to the left of the ClosedStruct to enable better visibility - sorry that my inline html/formatting isn't perfect. I also cut out some middle text that is just data. $ gem list *** LOCAL GEMS *** actionmailer (2.3.4) actionpack (2.3.4) activerecord (2.3.4) activeresource (2.3.4) activesupport (2.3.4) classifier (1.3.1) directory_watcher (1.2.0) haml (2.2.3) haml-edge (2.3.27) henrik-jekyll (0.5.2) liquid (2.0.0) maruku (0.6.0) open4 (0.9.6) rack (1.0.0) rails (2.3.4) rake (0.8.7) rdiscount (1.3.5) RedCloth (4.2.2) stemmer (1.0.1) syntax (1.0.0) Some showing for path verification: $ echo $PATH /home/chris/.gem/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games $ which haml /home/chris/.gem/bin/haml $ which jekyll /home/chris/.gem/bin/jekyll

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• varnish3, mod_geoip with apache2 using mod_rewrite and mod_rpaf

  - by mursalat

  I am maintaining a website with 3 different versions of the site, with 3 different languages, handles with a single system written in php, which takes in environment variables based on the domain name that is being accessed. These are the three sites: myshop.com : english international version myshop.eu : european version of site myshop.ru : russian version of the site when myshop.com is accessed from russia it is to be redirected to myshop.ru, and any country from europe accesses myshop.com, is redirected to myshop.eu, and international visitors stay at myshop.com, although they can go to the country specific site. All these redirections for the country is done using GeoIP apache2 mod in order to determine the country code, which is used in a RewriteCondition to state a RewriteRule, there are some exceptions of IPs that do not do the rewrite for, basically the IPs of the developer's PCs. The site has been doing just fine, until we decided to setup varnish to give the site a boost, it really did give it a great boost, but the country specific rewrites has become buggy. What started to happen is that a russian visitor can go to myshop.com and won't be redirected, until he clicks a random link (perhaps a link not cached by varnish yet) and the user is redirected to their specific country. For that i setup mod_rpaf, and for exceptions to the rewrite rule (for the developer's ip), i used this RewriteCond %{HTTP:X-FORWARDED-FOR} !^43\.43\.43\.43, and i restarted varnish and apache2, it worked for a while, then it messed up again. And whole day i have been doing changes however i have little no clue as to what's going on, sometimes it works, and sometimes it doesn't, and sometimes it half works, etc... As for geoip, i used a php to check the $_SERVER variable, and here is the general idea of the output [HTTP_X_FORWARDED_FOR] => 43.43.43.44 [HTTP_X_VARNISH] => 1705675599 [SERVER_ADDR] => 127.0.0.1 [SERVER_PORT] => 80 [REMOTE_ADDR] => 43.43.43.44 [GEOIP_ADDR] => 43.43.43.44 [GEOIP_CONTINENT_CODE] => EU [GEOIP_COUNTRY_CODE] => FR [GEOIP_COUNTRY_NAME] => France Now, thanks to the "random" redirects, i hardly have a clue as to what is going on, so can you guys please give me some ideas as to what tools to use to debug this? I have tried to see the redirect logs, but they really dont show much, and varnishlog isn't helping much either - although i must admit i am no professional at varnish. I believe the problem is with varnish trying to cache the url, and thus apache redirects are not being done properly, however visits the site first has a redirect, and based on that other users are served the content, depending on from where the user was when the cache was last updated, is it correct? if so, how can i solve the problem? Also, i have the option of using geoip redirects on varnish3 instead of using apache2 to do the redirects, is that what the best practice is? Any suggestion as to debugging this or to fix this would be helpful! thnx!

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• Python Django sites on Apache+mod_wsgi with nginx proxy: highly fluctuating performance

  - by Halfgaar

  I have an Ubuntu 10.04 box running several dozen Python Django sites using mod_wsgi (embedded mode; the faster mode, if properly configured). Performance highly fluctuates. Sometimes fast, sometimes several seconds delay. The smokeping graphs are al over the place. Recently, I also added an nginx proxy for the static content, in the hopes it would cure the highly fluctuating performance. But, even though it reduced the number of requests Apache has to process significantly, it didn't help with the main problem. When clicking around on websites while running htop, it can be seen that sometimes requests are almost instant, whereas sometimes it causes Apache to consume 100% CPU for a few seconds. I really don't understand where this fluctuation comes from. I have configured the mpm_worker for Apache like this: StartServers 1 MinSpareThreads 50 MaxSpareThreads 50 ThreadLimit 64 ThreadsPerChild 50 MaxClients 50 ServerLimit 1 MaxRequestsPerChild 0 MaxMemFree 2048 1 server with 50 threads, max 50 clients. Munin and apache2ctl -t both show a consistent presence of workers; they are not destroyed and created all the time. Yet, it behaves as such. This tells me that once a sub interpreter is created, it should remain in memory, yet it seems sites have to reload all the time. I also have a nginx+gunicorn box, which performs quite well. I would really like to know why Apache is so random. This is a virtual host config: <VirtualHost *:81> ServerAdmin [email protected] ServerName example.com DocumentRoot /srv/http/site/bla Alias /static/ /srv/http/site/static Alias /media/ /srv/http/site/media WSGIScriptAlias / /srv/http/site/passenger_wsgi.py <Directory /> AllowOverride None </Directory> <Directory /srv/http/site> Options -Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> Ubuntu 10.04 Apache 2.2.14 mod_wsgi 2.8 nginx 0.7.65 Edit: I've put some code in the settings.py file of a site that writes the date to a tmp file whenever it's loaded. I can now see that the site is not randomly reloaded all the time, so Apache must be keeping it in memory. So, that's good, except it doesn't bring me closer to an answer... Edit: I just found an error that might also be related to this: File "/usr/lib/python2.6/subprocess.py", line 633, in __init__ errread, errwrite) File "/usr/lib/python2.6/subprocess.py", line 1049, in _execute_child self.pid = os.fork() OSError: [Errno 12] Cannot allocate memory The server has 600 of 2000 MB free, which should be plenty. Is there a limit that is set on Apache or WSGI somewhere?

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• Intermittently, IIS7 requests get stuck in WindowsAuthenticationModule

  - by rbeier

  Hi, We're running an IIS7 server hosting several dozen websites. Several of these websites are all part of the same legacy app we've developed. These sites all run the same code and run in the same app pool. Roughly once a month over the past few months, we've found that all requests for this app pool start hanging indefinitely. When this happens, we receive an alert and we recycle the app pool. After that, the sites start working again. This only ever affects this one app pool - never any others on the same server. A couple times, before recycling the pool, I've looked at the currently-executing requests in the worker process. They all show up as executing inside the WindowsAuthenticationModule. Which is strange, because the vast majority of the application does not require authentication. There is a small admin section which uses Windows auth... but all the other requests should be anonymous. Does anyone have any idea as to what might be causing this? There are several unusual things about the way these sites are set up. As I mentioned, they all run the same code - multiple sites point at the same physical directory. The only difference is the host header bindings. I'm not sure why there isn't just one site with all the host headers, but that's how it works. In several of these sites, the same physical directory is mapped at two levels - as the root of the site and again as an application within the site. So if a user goes to http://oursite.com/index.aspx, that maps to c:\files\oursite\index.aspx. If a user goes to http://oursite.com/foo/index.aspx, that also maps to c:\files\oursite\index.aspx. I think there is code which looks at the request URL and handles the two requests differently. This is strange because the same web.config ends up being interpreted as a site config file, and also as an application config file within the site. I don't know if this might be related to the authentication problem. If we can't find the cause, we're thinking of a few workarounds we could try: Move the admin section into a separate site, and give the client a new admin URL. Run that separate site in its own app pool. Then in the web.config shared by all the other sites, remove the WindowsAuthenticationModule. That way there should be no possibility of a hang within the WindowsAuthenticationModule. Try running all these sites in the classic pipeline instead of the integrated pipeline. They were working fine on our old IIS6 server... (If we get desperate) Set up a watchdog script which monitors the sites and auto-recycles the app pool when it detects that requests are getting stuck. What do you think? Thanks for your help, Richard

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• Intermittently, IIS7 requests get stuck in WindowsAuthenticationModule

  - by Richard Beier

  We're running an IIS7 server hosting several dozen websites. Several of these websites are all part of the same legacy app we've developed. These sites all run the same code and run in the same app pool. Roughly once a month over the past few months, we've found that all requests for this app pool start hanging indefinitely. When this happens, we receive an alert and we recycle the app pool. After that, the sites start working again. This only ever affects this one app pool - never any others on the same server. A couple times, before recycling the pool, I've looked at the currently-executing requests in the worker process. They all show up as executing inside the WindowsAuthenticationModule. Which is strange, because the vast majority of the application does not require authentication. There is a small admin section which uses Windows auth... but all the other requests should be anonymous. Does anyone have any idea as to what might be causing this? There are several unusual things about the way these sites are set up. As I mentioned, they all run the same code - multiple sites point at the same physical directory. The only difference is the host header bindings. I'm not sure why there isn't just one site with all the host headers, but that's how it works. In several of these sites, the same physical directory is mapped at two levels - as the root of the site and again as an application within the site. So if a user goes to http://oursite.com/index.aspx, that maps to c:\files\oursite\index.aspx. If a user goes to http://oursite.com/foo/index.aspx, that also maps to c:\files\oursite\index.aspx. I think there is code which looks at the request URL and handles the two requests differently. This is strange because the same web.config ends up being interpreted as a site config file, and also as an application config file within the site. I don't know if this might be related to the authentication problem. If we can't find the cause, we're thinking of a few workarounds we could try: Move the admin section into a separate site, and give the client a new admin URL. Run that separate site in its own app pool. Then in the web.config shared by all the other sites, remove the WindowsAuthenticationModule. That way there should be no possibility of a hang within the WindowsAuthenticationModule. Try running all these sites in the classic pipeline instead of the integrated pipeline. They were working fine on our old IIS6 server... (If we get desperate) Set up a watchdog script which monitors the sites and auto-recycles the app pool when it detects that requests are getting stuck. What do you think? Thanks for your help, Richard

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• WordPress 3.5 Multisite and nginx siteurl issues

  - by Florin Gogianu

  I'm setting up multisite on localhost in subdirectories. The problem is that when I'm trying to access the dashboard of a site I just created ( localhost/wptest/site/wp-admin ) I get "This webpage has a redirect loop" and when I try to access the actual website ( localhost/wptest/site ) the page loads but without assets, such as css. When I access the network dashboard, or the primary site dashboard on localhost/wptest everything is just fine. Also when I edit the permalink of the second site in the network dashboard, to be like this: localhost/site it also runs fine. How to make it work with the default permalink structure localhost/wptest/site? The wordpress files are in /usr/share/html/wptest The wp-config.php is as follows: define('WP_ALLOW_MULTISITE', true); define('MULTISITE', true); define('SUBDOMAIN_INSTALL', false); define('DOMAIN_CURRENT_SITE', 'localhost'); define('PATH_CURRENT_SITE', '/wptest/'); define('SITE_ID_CURRENT_SITE', 1); define('BLOG_ID_CURRENT_SITE', 1); And the server block / virtual host is like this: server { ##DM - uncomment following line for domain mapping listen 80 default_server; #server_name example.com *.example.com ; ##DM - uncomment following line for domain mapping #server_name_in_redirect off; access_log /var/log/nginx/example.com.access.log; error_log /var/log/nginx/example.com.error.log; root /usr/share/nginx/html/wptest; index index.html index.htm index.php; if (!-e $request_filename) { rewrite /wp-admin$ $scheme://$host$uri/ permanent; rewrite ^(/[^/]+)?(/wp-.*) $2 last; rewrite ^(/[^/]+)?(/.*\.php) $2 last; } location / { try_files $uri $uri/ /index.php?$args ; } location ~ \.php$ { try_files $uri /index.php; include fastcgi_params; fastcgi_pass unix:/var/run/php5-fpm.sock; } location ~* ^.+\.(ogg|ogv|svg|svgz|eot|otf|woff|mp4|ttf|rss|atom|jpg|jpeg|gif|png|ico|zip|tgz|gz|rar|bz2|doc|xls|exe|ppt|tar|mid|midi|wav|bmp|rtf)$ { access_log off; log_not_found off; expires max; } location = /robots.txt { access_log off; log_not_found off; } location ~ /\. { deny all; access_log off; log_not_found off; } } And finally here's an error log: 2013/06/29 08:05:37 [error] 4056#0: *52 rewrite or internal redirection cycle while internally redirecting to "/index.php", client: 127.0.0.1, server: example.com, request: "GET /nginx HTTP/1.1", host: "localhost"

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• What the best way to achieve RPO of zero and lowest possible RTO (less than 15 minutes) with SQL 2008 R2?

  - by Adrian Hope-Bailie

  We are running a payments (EFT transaction processing) application which is processing high volumes of transactions 24/7 and are currently investigating a better way of doing DB replication to our disaster recovery site. Our current and previous strategies have included using both DoubleTake and Redgate to replicate data to a warm stand-by. DoubleTake is the supported solution from the payments software vendor however their (DoubleTake's) support in South Africa is very poor. We had a few issues and simply couldn't ever resolve them so we had to give up on DoubleTake. We have been using Redgate to manually read the data from the primary site (via queries) and write to the DR site but this is: A bad solution Getting the software vendor hot and bothered whenever we have support issues as it has a tendency to interfere with the payment application which is very DB intensive. We recently upgraded the whole system to run on SQL 2008 R2 Enterprise which means we should probably be looking at using some of the built-in replication features. The server has 2 fairly large databases with a mixture of tables containing highly volatile transactional data and pretty static configuration data. Replication would be done over a WAN link to a separate physical site and needs to achieve the following objectives. RPO: Zero loss - This is transactional data with financial impact so we can't lose anything. RTO: Tending to zero - The business depends on our ability to process transactions every minute we are down we are losing money I have looked at a few of the other questions/answers but none meet our case exactly: SQL Server 2008 failover strategy - Log shipping or replication? How to achieve the following RTO & RPO with logshipping only using SQL Server? What is the best of two approaches to achieve DB Replication? My current thinking is that we should use mirroring but I am concerned that for RPO:0 we will need to do delayed commits and this could impact the performance of the primary DB which is not an option. Our current DR process is to: Stop incoming traffic to the primary site and allow all in-flight transaction to complete. Allow the replication to DR to complete. Change network routing to route to DR site. Start all applications and services on the secondary site (Ideally we can change this to a warmer stand-by whereby the applications are already running but not processing any transactions). In other words the DR database needs to, as quickly as possible, catch up with primary and be ready for processing as the new primary. We would then need to be able to reverse this when we are ready to switch back. Is there a better option than mirroring (should we be doing log-shipping too) and can anyone suggest other considerations that we should keep in mind?

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• How to use HTTPContext for SPList

  - by Azra

  I have the following requirement. public void GetSubSite(SPWeb site) { site.AllowUnsafeUpdates = true; SPList destinationList = site.Lists[TASKS]; SPWebCollection subSitesCollection = site.Webs; foreach (SPWeb subSite in subSitesCollection) { //..... Now I want to display the destinationList as a web part, and every time the user loads the page, it should be populated freshly. How can i achieve that with HTTPContext?

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• Django: CharField with fixed length, how?

  - by Giovanni Di Milia

  Hi everybody, I wold like to have in my model a CharField with fixed length. In other words I want that only a specified length is valid. I tried to do something like volumenumber = models.CharField('Volume Number', max_length=4, min_length=4) but it gives me an error (it seems that I can use both max_length and min_length at the same time). Is there another quick way? Thanks EDIT: Following the suggestions of some people I will be a bit more specific: My model is this: class Volume(models.Model): vid = models.AutoField(primary_key=True) jid = models.ForeignKey(Journals, db_column='jid', null=True, verbose_name = "Journal") volumenumber = models.CharField('Volume Number') date_publication = models.CharField('Date of Publication', max_length=6, blank=True) class Meta: db_table = u'volume' verbose_name = "Volume" ordering = ['jid', 'volumenumber'] unique_together = ('jid', 'volumenumber') def __unicode__(self): return (str(self.jid) + ' - ' + str(self.volumenumber)) What I want is that the volumenumber must be exactly 4 characters. I.E. if someone insert '4b' django gives an error because it expects a string of 4 characters. So I tried with volumenumber = models.CharField('Volume Number', max_length=4, min_length=4) but it gives me this error: Validating models... Unhandled exception in thread started by <function inner_run at 0x70feb0> Traceback (most recent call last): File "/Library/Python/2.5/site-packages/django/core/management/commands/runserver.py", line 48, in inner_run self.validate(display_num_errors=True) File "/Library/Python/2.5/site-packages/django/core/management/base.py", line 249, in validate num_errors = get_validation_errors(s, app) File "/Library/Python/2.5/site-packages/django/core/management/validation.py", line 28, in get_validation_errors for (app_name, error) in get_app_errors().items(): File "/Library/Python/2.5/site-packages/django/db/models/loading.py", line 131, in get_app_errors self._populate() File "/Library/Python/2.5/site-packages/django/db/models/loading.py", line 58, in _populate self.load_app(app_name, True) File "/Library/Python/2.5/site-packages/django/db/models/loading.py", line 74, in load_app models = import_module('.models', app_name) File "/Library/Python/2.5/site-packages/django/utils/importlib.py", line 35, in import_module __import__(name) File "/Users/Giovanni/src/djangoTestSite/../djangoTestSite/journaldb/models.py", line 120, in <module> class Volume(models.Model): File "/Users/Giovanni/src/djangoTestSite/../djangoTestSite/journaldb/models.py", line 123, in Volume volumenumber = models.CharField('Volume Number', max_length=4, min_length=4) TypeError: __init__() got an unexpected keyword argument 'min_length' That obviously doesn't appear if I use only "max_length" OR "min_length". I read the documentation on the django web site and it seems that I'm right (I cannot use both together) so I'm asking if there is another way to solve the problem. Thanks again

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• Data migration from site5 to heroku

  - by Denis

  Hi, I've a Rails 2.1.2 App hosted on site 5. This App is running since 2 years and I want to migrate the site on heroku. No pb to install the site on heroku, but what about the data?! What is the best strategy to export from site 5 (I've phpMyAdmin) and then import to heroku? Thanks

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• SharePoint Groups\Roles using FBA

  - by Itay

  Hi All, I'm running an FBA web app, having 2 Site collections. Currently I have a SharePoint group in one site collection, and I would like to assign permission to that group in the other site collection. Since SharePoint groups are site scoped, I thought using FBA roles.. Any words on how to do this, or if this it the recommended way? Thanks.

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• Redirect url to # (anchor)

  - by Craig Fowler

  I have a site that I just converted to use anchor navigation.. hwww.site.com/shows is now www.site.com/#shows It loads the info from the /shows directory to a div and adds the hash tag to tell you where you are. The problem is, if you go to www.site.com/shows, the content is still there, but unstyled. How can I get it to redirect without going into an infinite loop of redirects? I'm sure I explained that terribly, hopefully you guys get it.

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• Is it ok if everything is looking ok but X/HTML and CSS are not valid , for CMS's Admin/control pane

  - by jitendra

  Is it ok if everythingis looking ok but html and css are not valid , for CMS's Admin/control panel? Should we only consider Web-standards for site, not necessary for site-management tools? for example :http://site.com/wp-admin :http://site.com/admin/

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