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• Heartbeat won't successfully start up resources from a cold boot when a failed node is present

  - by Matthew

  I currently have two ubuntu servers running Heartbeat and DRBD. The servers are directory connected with a 1000Mbps crossover cable on eth1 and have access to an IP camera LAN on eth0. Now, let's say that one node is down and the remaining functional node is booting after having been shut down. The node that is still functioning won't start up heartbeat and provide access to the drbd resource from a cold boot. I have to manually restart heartbeat by sudo service heartbeat restart to get everything up and running. How can I get it to start fine from a cold start, when only one server is present? Here is the ha.cf: debug /var/log/ha-debug logfile /var/log/ha-log logfacility none keepalive 2 deadtime 10 warntime 7 initdead 60 ucast eth1 192.168.2.2 ucast eth0 10.1.10.201 node EMserver1 node EMserver2 respawn hacluster /usr/lib/heartbeat/ipfail ping 10.1.10.22 10.1.10.21 10.1.10.11 auto_failback off Some material from the syslog: harc[4604]: 2012/11/27_13:54:49 info: Running /etc/ha.d//rc.d/status status mach_down[4632]: 2012/11/27_13:54:49 info: /usr/share/heartbeat/mach_down: nice_failback: foreign resources acquired mach_down[4632]: 2012/11/27_13:54:49 info: mach_down takeover complete for node emserver2. Nov 27 13:54:49 EMserver1 heartbeat: [4586]: info: Initial resource acquisition complete (T_RESOURCES(us)) Nov 27 13:54:49 EMserver1 heartbeat: [4586]: info: mach_down takeover complete. IPaddr[4679]: 2012/11/27_13:54:49 INFO: Resource is stopped Nov 27 13:54:49 EMserver1 heartbeat: [4605]: info: Local Resource acquisition completed. harc[4713]: 2012/11/27_13:54:49 info: Running /etc/ha.d//rc.d/ip-request-resp ip-request-resp ip-request-resp[4713]: 2012/11/27_13:54:49 received ip-request-resp IPaddr::10.1.10.254 OK yes ResourceManager[4732]: 2012/11/27_13:54:50 info: Acquiring resource group: emserver1 IPaddr::10.1.10.254 drbddisk::r0 Filesystem::/dev/drbd1::/shr::ext4 nfs-kernel-server IPaddr[4759]: 2012/11/27_13:54:50 INFO: Resource is stopped ResourceManager[4732]: 2012/11/27_13:54:50 info: Running /etc/ha.d/resource.d/IPaddr 10.1.10.254 start IPaddr[4816]: 2012/11/27_13:54:50 INFO: Using calculated nic for 10.1.10.254: eth0 IPaddr[4816]: 2012/11/27_13:54:50 INFO: Using calculated netmask for 10.1.10.254: 255.255.255.0 IPaddr[4816]: 2012/11/27_13:54:50 INFO: eval ifconfig eth0:0 10.1.10.254 netmask 255.255.255.0 broadcast 10.1.10.255 IPaddr[4804]: 2012/11/27_13:54:50 INFO: Success ResourceManager[4732]: 2012/11/27_13:54:50 info: Running /etc/ha.d/resource.d/drbddisk r0 start Filesystem[4965]: 2012/11/27_13:54:50 INFO: Resource is stopped ResourceManager[4732]: 2012/11/27_13:54:50 info: Running /etc/ha.d/resource.d/Filesystem /dev/drbd1 /shr ext4 start Filesystem[5039]: 2012/11/27_13:54:50 INFO: Running start for /dev/drbd1 on /shr Filesystem[5033]: 2012/11/27_13:54:51 INFO: Success ResourceManager[4732]: 2012/11/27_13:54:51 info: Running /etc/init.d/nfs-kernel-server start Nov 27 13:55:00 EMserver1 heartbeat: [4586]: info: Local Resource acquisition completed. (none) Nov 27 13:55:00 EMserver1 heartbeat: [4586]: info: local resource transition completed. Nov 27 13:57:46 EMserver1 heartbeat: [4586]: info: Heartbeat shutdown in progress. (4586) Nov 27 13:57:46 EMserver1 heartbeat: [5286]: info: Giving up all HA resources. ResourceManager[5301]: 2012/11/27_13:57:46 info: Releasing resource group: emserver1 IPaddr::10.1.10.254 drbddisk::r0 Filesystem::/dev/drbd1::/shr::ext4 nfs-kernel-server ResourceManager[5301]: 2012/11/27_13:57:46 info: Running /etc/init.d/nfs-kernel-server stop ResourceManager[5301]: 2012/11/27_13:57:46 info: Running /etc/ha.d/resource.d/Filesystem /dev/drbd1 /shr ext4 stop Filesystem[5372]: 2012/11/27_13:57:46 INFO: Running stop for /dev/drbd1 on /shr Filesystem[5372]: 2012/11/27_13:57:47 INFO: Trying to unmount /shr Filesystem[5372]: 2012/11/27_13:57:47 INFO: unmounted /shr successfully Filesystem[5366]: 2012/11/27_13:57:47 INFO: Success ResourceManager[5301]: 2012/11/27_13:57:47 info: Running /etc/ha.d/resource.d/drbddisk r0 stop ResourceManager[5301]: 2012/11/27_13:57:47 info: Running /etc/ha.d/resource.d/IPaddr 10.1.10.254 stop IPaddr[5509]: 2012/11/27_13:57:47 INFO: ifconfig eth0:0 down IPaddr[5497]: 2012/11/27_13:57:47 INFO: Success Nov 27 13:57:47 EMserver1 heartbeat: [5286]: info: All HA resources relinquished. Nov 27 13:57:48 EMserver1 heartbeat: [4586]: info: killing /usr/lib/heartbeat/ipfail process group 4603 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBFIFO process 4589 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBWRITE process 4590 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBREAD process 4591 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBWRITE process 4592 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBREAD process 4593 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBWRITE process 4594 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBREAD process 4595 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBWRITE process 4596 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBREAD process 4597 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBWRITE process 4598 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: killing HBREAD process 4599 with signal 15 Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4589 exited. 11 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4596 exited. 10 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4598 exited. 9 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4590 exited. 8 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4595 exited. 7 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4591 exited. 6 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4592 exited. 5 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4593 exited. 4 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4597 exited. 3 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4594 exited. 2 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: Core process 4599 exited. 1 remaining Nov 27 13:57:49 EMserver1 heartbeat: [4586]: info: emserver1 Heartbeat shutdown complete. Here is some more from the log ResourceManager[2576]: 2012/11/28_16:32:42 info: Acquiring resource group: emserver1 IPaddr::10.1.10.254 drbddisk::r0 Filesystem::/dev/drbd1::/shr::ext4 nfs-kernel-server IPaddr[2602]: 2012/11/28_16:32:42 INFO: Running OK Filesystem[2653]: 2012/11/28_16:32:43 INFO: Running OK Nov 28 16:32:52 EMserver1 heartbeat: [1695]: WARN: node emserver2: is dead Nov 28 16:32:52 EMserver1 heartbeat: [1695]: info: Dead node emserver2 gave up resources. Nov 28 16:32:52 EMserver1 ipfail: [1807]: info: Status update: Node emserver2 now has status dead Nov 28 16:32:52 EMserver1 heartbeat: [1695]: info: Link emserver2:eth1 dead. Nov 28 16:32:53 EMserver1 ipfail: [1807]: info: NS: We are still alive! Nov 28 16:32:53 EMserver1 ipfail: [1807]: info: Link Status update: Link emserver2/eth1 now has status dead Nov 28 16:32:55 EMserver1 ipfail: [1807]: info: Asking other side for ping node count. Nov 28 16:32:55 EMserver1 ipfail: [1807]: info: Checking remote count of ping nodes. Nov 28 16:32:57 EMserver1 heartbeat: [1695]: info: Heartbeat shutdown in progress. (1695) Nov 28 16:32:57 EMserver1 heartbeat: [2734]: info: Giving up all HA resources. ResourceManager[2751]: 2012/11/28_16:32:57 info: Releasing resource group: emserver1 IPaddr::10.1.10.254 drbddisk::r0 Filesystem::/dev/drbd1::/shr::ext4 nfs-kernel-server ResourceManager[2751]: 2012/11/28_16:32:57 info: Running /etc/init.d/nfs-kernel-server stop ResourceManager[2751]: 2012/11/28_16:32:57 info: Running /etc/ha.d/resource.d/Filesystem /dev/drbd1 /shr ext4 stop Filesystem[2829]: 2012/11/28_16:32:57 INFO: Running stop for /dev/drbd1 on /shr Filesystem[2829]: 2012/11/28_16:32:57 INFO: Trying to unmount /shr Filesystem[2829]: 2012/11/28_16:32:58 INFO: unmounted /shr successfully Filesystem[2823]: 2012/11/28_16:32:58 INFO: Success ResourceManager[2751]: 2012/11/28_16:32:58 info: Running /etc/ha.d/resource.d/drbddisk r0 stop ResourceManager[2751]: 2012/11/28_16:32:58 info: Running /etc/ha.d/resource.d/IPaddr 10.1.10.254 stop IPaddr[2971]: 2012/11/28_16:32:58 INFO: ifconfig eth0:0 down IPaddr[2958]: 2012/11/28_16:32:58 INFO: Success Nov 28 16:32:58 EMserver1 heartbeat: [2734]: info: All HA resources relinquished. Nov 28 16:32:59 EMserver1 heartbeat: [1695]: info: killing /usr/lib/heartbeat/ipfail process group 1807 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBFIFO process 1777 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBWRITE process 1778 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBREAD process 1779 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBWRITE process 1780 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBREAD process 1781 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBWRITE process 1782 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBREAD process 1783 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBWRITE process 1784 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBREAD process 1785 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBWRITE process 1786 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: killing HBREAD process 1787 with signal 15 Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1778 exited. 11 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1779 exited. 10 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1780 exited. 9 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1781 exited. 8 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1782 exited. 7 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1783 exited. 6 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1784 exited. 5 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1785 exited. 4 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1786 exited. 3 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1787 exited. 2 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: Core process 1777 exited. 1 remaining Nov 28 16:33:01 EMserver1 heartbeat: [1695]: info: emserver1 Heartbeat shutdown complete. If I restarted heartbeat at this point... the resources heartbeat controls would start up fine.... please help!

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• Is Rails Metal (& Rack) a good way to implement a high traffic web service api?

  - by Greg

  I am working on a very typical web application. The main component of the user experience is a widget that a site owner would install on their front page. Every time their front page loads, the widget talks to our server and displays some of the data that returns. So there are two components to this web application: the front end UI that the site owner uses to configure their widget the back end component that responds to the widget's web api call Previously we had all of this running in PHP. Now we are experimenting with Rails, which is fantastic for #1 (the front end UI). The question is how to do #2, the back serving of widget information, efficiently. Obviously this is much higher load than the front end, since it is called every time the front page loads on one of our clients' websites. I can see two obvious approaches: A. Parallel Stack: Set up a parallel stack that uses something other than rails (e.g. our old PHP-based approach) but accesses the same database as the front end B. Rails Metal: Use Rails Metal/Rack to bypass the Rails routing mechanism, but keep the api call responder within the Rails app My main question: Is Rails/Metal a reasonable approach for something like this? But also... Will the overhead of loading the Rails environment still be too heavy? Is there a way to get even closer to the metal with Rails, bypassing most of the environment? Will Rails/Metal performance approach the perf of a similar task on straight PHP (just looking for ballpark here)? And... Is there a 'C' option that would be much better than both A and B? That is, something before going to the lengths of C code compiled to binary and installed as an nginx or apache module? Thanks in advance for any insights.

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• JQuery ajax call to httpget webmethod (c#) not working

  - by Tim Jarvis

  I am trying to get an ajax get to a webmethod in code behind. The problem is I keep getting the error "parserror" from the JQuery onfail method. If I change the GET to a POST everything works fine. Please see my code below. Ajax Call <script type="text/javascript"> var id = "li1234"; function AjaxGet() { $.ajax({ type: "GET", url: "webmethods.aspx/AjaxGet", data: "{ 'id' : '" + id + "'}", contentType: "application/json; charset=utf-8", dataType: "json", async: false, success: function(msg) { alert("success"); }, error: function(msg, text) { alert(text); } }); } </script> Code Behind [System.Web.Services.WebMethod] [System.Web.Script.Services.ScriptMethod(UseHttpGet = true, ResponseFormat = System.Web.Script.Services.ResponseFormat.Json)] public static string AjaxGet(string id) { return id; } Web.config <webServices> <protocols> <add name="HttpGet"/> </protocols> </webServices> The URL being used ......../webmethods.aspx/AjaxGet?{%20%27id%27%20:%20%27li1234%27} As part of the response it is returning the html for the page webmethods. Any help will be greatly appreciated.

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• sqlalchemy date type in 0.6 migration using mssql

  - by nosklo

  I'm connection to mssql server through pyodbc, via FreeTDS odbc driver, on linux ubuntu 10.04. Sqlalchemy 0.5 uses DATETIME for sqlalchemy.Date() fields. Now Sqlalchemy 0.6 uses DATE, but sql server 2000 doesn't have a DATE type. How can I make DATETIME be the default for sqlalchemy.Date() on sqlalchemy 0.6 mssql+pyodbc dialect? I'd like to keep it as clean as possible. Here's code to reproduce the issue: import sqlalchemy from sqlalchemy import Table, Column, MetaData, Date, Integer, create_engine engine = create_engine( 'mssql+pyodbc://sa:sa@myserver/mydb?driver=FreeTDS') m = MetaData(bind=engine) tb = sqlalchemy.Table('test_date', m, Column('id', Integer, primary_key=True), Column('dt', Date()) ) tb.create() And here is the traceback I'm getting: Traceback (most recent call last): File "/tmp/teste.py", line 15, in <module> tb.create() File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/schema.py", line 428, in create bind.create(self, checkfirst=checkfirst) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/base.py", line 1647, in create connection=connection, **kwargs) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/base.py", line 1682, in _run_visitor **kwargs).traverse_single(element) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/sql/visitors.py", line 77, in traverse_single return meth(obj, **kw) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/ddl.py", line 58, in visit_table self.connection.execute(schema.CreateTable(table)) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/base.py", line 1157, in execute params) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/base.py", line 1210, in _execute_ddl return self.__execute_context(context) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/base.py", line 1268, in __execute_context context.parameters[0], context=context) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/base.py", line 1367, in _cursor_execute context) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/base.py", line 1360, in _cursor_execute context) File "/home/nosklo/.local/lib/python2.6/site-packages/sqlalchemy/engine/default.py", line 277, in do_execute cursor.execute(statement, parameters) sqlalchemy.exc.ProgrammingError: (ProgrammingError) ('42000', '[42000] [FreeTDS][SQL Server]Column or parameter #2: Cannot find data type DATE. (2715) (SQLExecDirectW)') '\nCREATE TABLE test_date (\n\tid INTEGER NOT NULL IDENTITY(1,1), \n\tdt DATE NULL, \n\tPRIMARY KEY (id)\n)\n\n' ()

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• Why is my WPF splash screen progress bar out of sync with the execution of the startup steps?

  - by denny_ch

  Hello, I've implemented a simple WPF splash screen window which informs the user about the progress of the application startup. The startup steps are defined this way: var bootSequence = new[] { new {Do = (Action) InitLogging, Message = "Init logging..."}, new {Do = (Action) InitNHibernate, Message = "Init NHibernate..."}, new {Do = (Action) SetupUnityContainer, Message = "Init Unity..."}, new {Do = (Action) UserLogOn, Message = "Logon..."}, new {Do = (Action) PrefetchData, Message = "Caching..."}, }; InitLogging etc. are methods defined elsewhere, which performs some time consuming tasks. The boot sequence gets executed this way: foreach (var step in bootSequence) { _status.Update(step.Message); step.Do(); } _status denotes an instance of my XAML splash screen window containing a progress bar and a label for status information. Its Update() method is defined as follows: public void Update(string status) { int value = ++_updateSteps; Update(status, value); } private void Update(string status, int value) { var dispatcherOperation = Dispatcher.BeginInvoke( DispatcherPriority.Background, (ThreadStart) delegate { lblStatus.Content = status; progressBar.Value = value; }); dispatcherOperation.Wait(); } In the main this works, the steps get executed and the splash screen shows the progress. But I observed that the splash screen for some reasons doesn't update its content for all steps. This is the reason I called the Dispatcher async and wait for its completion. But even this didn't help. Has anyone else experienced this or some similar behaviour and has some advice how to keep the splash screen's update in sync with the execution of the boot sequence steps? I know that the users will unlikely notice this behaviour, since the splash screen is doing something and the application starts after booting is completed. But myself isn't sleeping well, because I don't know why it is not working as expected... Thx for your help, Denny

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• T4 vs CodeDom vs Oslo

  - by Ryan Riley

  In an application scaffolding project on which I'm working, I'm trying to decide whether to use Oslo, T4 or CodeDom for generating code. Our goals are to keep dependencies to a minimum and drive code generation for a domain driven design from user stories. The first step will be to create the tests from the user stories, but we want the domain experts to be able to write their stories in a variety of different media (e.g. custom app, Word, etc.) and still generate the tests from the stories. What I know so far: CodeDom requires .NET but can only output .NET class files (e.g. .cs, .vb). Level of difficulty is fairly high. T4 requires CodeDom and VS Standard+. Level of difficulty is fairly reasonable, especially with the T4 Toolbox. Oslo is very new. I have no idea of the dependencies, but I imagine you must be on at least .NET 3.5. I'm also not certain as to the code generation abilities or the complexity for adding new grammars. However, domain experts could probably write user stories in Intellipad quite easily. Also not sure about ease of converting stories in Word to an MGrammar. What are your thoughts, experiences, etc. with any of the above tools. We want to stick with Microsoft or open source tools.

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• mongodb: insert if not exists

  - by LeMiz

  Hello, Every day, I receive a stock of documents (an update). What I want to do is inserting each of them if it does not exists. I also want to keep track of the first time I inserted them, and the last time I saw them in an update. I don't want to have duplicate documents. I don't want to remove a document which has previously been saved, but is not in my update. 95% (estimated) of the records are unmodified from day to day. I am using the python driver (pymongo), for that matter. What I currently do is (pseudo-code): for each document in update: existing_document = collection.find_one(document) if not existing_document: document['insertion_date'] = now else: document = existing_document document['last_update_date'] = now my_collection.save(document) My problem is that it is very slow (40 mins for less than 100 000 records, and I have millions of them in the update). I am pretty sure there is something builtin for doing this, but the document for update() is mmmhhh.... a bit terse.... ( http://www.mongodb.org/display/DOCS/Updating ) Can someone give an advice on doing it faster ?

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• ASP.Net Panel JQuery SlideToggle Postback

  - by Germ

  I have an asp.net panel with a style which hides it and I'm using JQuery to slideToggle the panel using a hyperlink. This works fine. However, if I add a button on the page that causes a postback the panel will default back to hidden. I understand why this is happening but what is the best way to keep the panels visibility state when a postback occurs? <head runat="server"> <title></title> <script type='text/javascript' src="jquery-1.4.1.min.js"> </script> <style type="text/css"> .panel { display: none; } </style> <script type="text/javascript"> $(function() { $("#Link1").click(function(evt) { evt.preventDefault(); $('#panelText').slideToggle('slow'); }); }); </script> </head> <body> <form id="form1" runat="server"> <asp:HyperLink ID="Link1" runat="server" NavigateUrl="#">SlideToggle </asp:HyperLink><br /> <asp:Panel ID="panelText" runat="server" CssClass="panel"> Some text</asp:Panel> <asp:Button ID="button1" runat="server" Text="Postback" /> </form> </body> </html>

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• Error installing geoip_city gem

  - by tomeara

  I keep getting an error when trying to install the geoip_city gem. I've already installed the GeoIP C library to /opt/GeoIP, but the gem doesn't seem to pick it up. I've tried: sudo gem install geoip_city -- --with-geoip-dir=/opt/GeoIP sudo gem install geoip_city -- --with-geoip-lib=/opt/GeoIP/lib sudo gem install geoip_city -- --with-geoip-dir=/opt/GeoIP --with-geoip-lib=/opt/GeoIP/lib all of which output this error: Building native extensions. This could take a while... ERROR: Error installing geoip_city: ERROR: Failed to build gem native extension. /System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby extconf.rb --with-geoip-lib=/opt/GeoIP/lib checking for GeoIP_record_by_ipnum() in -lGeoIP... no you must have geoip c library installed! *** extconf.rb failed *** Could not create Makefile due to some reason, probably lack of necessary libraries and/or headers. Check the mkmf.log file for more details. You may need configuration options. Provided configuration options: --with-opt-dir --without-opt-dir --with-opt-include --without-opt-include=${opt-dir}/include --with-opt-lib --without-opt-lib=${opt-dir}/lib --with-make-prog --without-make-prog --srcdir=. --curdir --ruby=/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/bin/ruby --with-geoip-dir --without-geoip-dir --with-geoip-include --without-geoip-include=${geoip-dir}/include --with-geoip-lib=${geoip-dir}/lib --with-GeoIPlib --without-GeoIPlib Gem files will remain installed in /Library/Ruby/Gems/1.8/gems/geoip_city-0.2.0 for inspection. Results logged to /Library/Ruby/Gems/1.8/gems/geoip_city-0.2.0/gem_make.out

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• How do you host multiple public facing websites on a VPS?

  - by Petras

  We host about 30 websites using typical shared hosting plans using ASP.NET and SQL 2000/2005/2008. I am now wondering about hosting all of these websites using our own virtual private server such as http://www.crystaltech.com/vps.aspx This is clearly cheaper but comes with a lot of questions I need answers to: Is the risk of having to keep this VPS server up and running worth it? Until now, the host provider has managed the server and we have not had to worry about crashes, downtime, software patches etc. We are not server administrators, we are programmers, so this is not really our expertise. On the other hand, it may not be hard to learn. When we make a website live, we log in to a domain management control panel and change the primary and secondary name servers to point to our shared web host: Eg ns1.sharedwebhost.com and ns2.sharedwebhost.com These name servers are going to have to change when we have a VPS. I don’t understand anything about how to set this up. Is there some useful info anyone could direct me to? Or is there software we need to install to make the primary and secondary name servers work on our VPS? The control panel we have for shared hosting comes with DNS management like this: What software would I need to install to create this for each site we host at a VPS? The control panel we have for shared hosting also comes with a POP email interface that allows email addresses to be added easily: Is this something that can be easily set up at a VPS so clients can manage their own email addresses? Is there software we need to install to make this work?

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• Cannot add Authorization field to HttpsUrlConnection in order to complete Basic authentication

  - by ES

  Hi, I'm using the Sun API HttpsURLConnection class, and have been trying for a day now to get it to send a simple request: URL url = new URL("https://thirdpartyserver.com/somelocation"); connection = (HttpsURLConnection)url.openConnection(); connection.setDoOutput(true); connection.setRequestMethod("POST"); if (doAuthorization) { Base64Converter converter = new Base64Converter(); connection.setRequestProperty("Authorization", "Basic " + converter.encode("username:password")); } OutputStreamWriter writer = new OutputStreamWriter(connection.getOutputStream()); writer.write("param1=100&param2=hello"); writer.flush(); writer.close(); I keep getting 401 from the third part server. When I look at the connection through the debugger, the method shows up as GET even though I set it to POST; the collection of request properties shows up as null. If I print the values out, the method shows up as POST, but the request parameters collection is still empty. I would love to be able to print the request and understand what's going on, but I could not figure out how to print the content of an output buffer. Any ideas? Thanks! ES

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• How to scrape a _private_ google group?

  - by John

  Hi there, I'd like to scrape the discussion list of a private google group. It's a multi-page list and I might have to this later again so scripting sounds like the way to go. Since this is a private group, I need to login in my google account first. Unfortunately I can't manage to login using wget or ruby Net::HTTP. Surprisingly google groups is not accessible with the Client Login interface, so all the code samples are useless. My ruby script is embedded at the end of the post. The response to the authentication query is a 200-OK but no cookies in the response headers and the body contains the message "Your browser's cookie functionality is turned off. Please turn it on." I got the same output with wget. See the bash script at the end of this message. I don't know how to workaround this. am I missing something? Any idea? Thanks in advance. John Here is the ruby script: # a ruby script require 'net/https' http = Net::HTTP.new('www.google.com', 443) http.use_ssl = true path = '/accounts/ServiceLoginAuth' email='[email protected]' password='topsecret' # form inputs from the login page data = "Email=#{email}&Passwd=#{password}&dsh=7379491738180116079&GALX=irvvmW0Z-zI" headers = { 'Content-Type' => 'application/x-www-form-urlencoded', 'user-agent' => "Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/533.2 (KHTML, like Gecko) Chrome/6.0"} # Post the request and print out the response to retrieve our authentication token resp, data = http.post(path, data, headers) puts resp resp.each {|h, v| puts h+'='+v} #warning: peer certificate won't be verified in this SSL session Here is the bash script: # A bash script for wget CMD="" CMD="$CMD --keep-session-cookies --save-cookies cookies.tmp" CMD="$CMD --no-check-certificate" CMD="$CMD --post-data='[email protected]&Passwd=topsecret&dsh=-8408553335275857936&GALX=irvvmW0Z-zI'" CMD="$CMD --user-agent='Mozilla'" CMD="$CMD https://www.google.com/accounts/ServiceLoginAuth" echo $CMD wget $CMD wget --load-cookies="cookies.tmp" http://groups.google.com/group/mygroup/topics?tsc=2

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• NSDate dateFromString, how to parse 'around' UTC, GMT and User locale?

  - by RickiG

  Hi I parse some values from an xml file. There is a @"25-12-2010'T'23:40:00"string with the time and date and there is a string with the GMT offset like this @"+0200". So the above time is the 25. of December 23:40:00 in timeZone +0200 GMT. (or 21:40 UTC) I have lots of these dates with different GMT offsets. I have to display these dates as they are, i.e. They must not be changed to fit the locale of the user. So if time 1: is 22:45 +0500 then that is what I must show the user, even if the user is in a different timezone. I have all sorts of trouble with displaying, calculating and parsing these strings. If I use a dateFormatter and dateFromString the user specific GMT info will be included in the resulting NSDate meaning the above will be saved as 23:40:00 +0100 GMT because that is my phones setting and maybe 23:40:00 -0400 on a user from new New York's phone. When I subsequently do subtraction, addition and comparisons between these dates I have to keep the GMT offset around and everything gets worse if the phone switches locale settings, from when the date was parsed to when the date is displayed... Is there a way for me to extract this date from the string as UTC, then save it as an interval instead of an actual (timezone dependent) date. I know that is how dates are always saved internally. But I can't figure out how to do it with the separate GMT string and taking into account the users locale. Cheers

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• Calculating pi using infinite series in C#

  - by Jonathan Chan

  Hi! I tried to write the following program in C# to calculate pi using infinite recursion, but I keep getting confused about integer/double/decimal division. I really have no clue why this isn't working, so pardon me for my lack of understanding of strongly typed stuff, as I'm still learning C#. Thanks in advance! using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { public static int Main(string[] args) { int numeratornext = 2; int denominatornext = 5; decimal findto = 100.0M; decimal pi = 0.0M; decimal halfpi = 1.0M; int seriesnum = 1; int seriesden = 3; for (int i = 0; i < findto; i++) { halfpi += Decimal.Divide((decimal)seriesnum, (decimal)seriesden); //System.Console.WriteLine(Decimal.Divide((decimal)seriesnum, (decimal)seriesden).ToString()); seriesnum *= numeratornext; seriesden *= denominatornext; numeratornext++; denominatornext += 2; } pi = halfpi * 2; System.Console.WriteLine(pi.ToString()); System.Console.ReadLine(); return 0; } } }

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• Application/Server dependency mapping

  - by David Stratton

  I'm just curious as to whether such as tool exists (free, open source, or commercial but for a reasonable price) before I build it myself. We're looking for a simple solution to simplify taking web apps online and offline when a server is undergoing maintenance. The idea is that we be able to mark a server as unavailable, and then mark all dependent (direct and indirect) as offline. Our first proof-of-concept is running, and we created an aspx page that lists various applications that have an App_Offline.html file with a friendly "Down for Maintenance" message in a GridView. In the GridView, each app has a LinkButton that, when clicked, either renames the App_Offline.htm to App_Offline.html or vice-versa to take the app online and offline. The next step is to set up all of our dependencies. For example, our store locater would be dependent on our web services, which in turn are dependent on our SQL Server. (that's a simple example. We can easily have several layers, or one app dependent on multiple servers, etc.) In this example, if the SQL server goes down, we would need to drill down recursively to find all apps that depend on it, and then turn them off and on by renaming the App_Offline file appropriately. I realize this will be relatively simple to build, but could be complex to manage. I'm sure we're not the first team to think of this concept, and I'm wondering if there are any open source tools, or if any of you have done something similar and can help us avoid pitfalls. Edit - Update I found the category of software I'm looking for. it's called CMDB - (Configuration Management Database), and it's generally more of a Network Admin type tool than a developer tool. I found some open source products in this category, but none written in .NET. I had considered moving this question to ServerFault.com when I realized I was looking for a netowrk Admin type tool, but since I'm looking for code and a modifiable solution I'll keep the question here.

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• MySQL Connection Timeout Issue - Grails Application on Tomcat using Hibernate and ORM

  - by gav

  Hi Guys I have a small grails application running on Tomcat in Ubuntu on a VPS. I use MySql as my datastore and everything works fine unless I leave the application for more than half a day (8 hours?). I did some searching and apparently this is the default wait_timeout in mysql.cnf so after 8 hours the connection will die but Tomcat won't know so when the next user tries to view the site they will see the connection failure error. Refreshing the page will fix this but I want to get rid of the error altogether. For my version of MySql (5.0.75) I have only my.cnf and it doesn't contain such a parameter, In any case changing this parameter doesn't solve the problem. This Blog Post seems to be reporting a similar error but I still don't fully understand what I need to configure to get this fixed and also I am hoping that there is a simpler solution than another third party library. The machine I'm running on has 256MB ram and I'm trying to keep the number of programs/services running to a minimum. Is there something I can configure in Grails / Tomcat / MySql to get this to go away? Thanks in advance, Gav From my Catalina.out; 2010-04-29 21:26:25,946 [http-8080-2] ERROR util.JDBCExceptionReporter - The last packet successfully received from the server was 102,906,722 milliseconds$ 2010-04-29 21:26:25,994 [http-8080-2] ERROR errors.GrailsExceptionResolver - Broken pipe java.net.SocketException: Broken pipe at java.net.SocketOutputStream.socketWrite0(Native Method) ... 2010-04-29 21:26:26,016 [http-8080-2] ERROR util.JDBCExceptionReporter - Already closed. 2010-04-29 21:26:26,016 [http-8080-2] ERROR util.JDBCExceptionReporter - Already closed. 2010-04-29 21:26:26,017 [http-8080-2] ERROR servlet.GrailsDispatcherServlet - HandlerInterceptor.afterCompletion threw exception org.hibernate.exception.GenericJDBCException: Cannot release connection at java.lang.Thread.run(Thread.java:619) Caused by: java.sql.SQLException: Already closed. at org.apache.commons.dbcp.PoolableConnection.close(PoolableConnection.java:84) at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.close(PoolingDataSource.java:181) ... 1 more

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• MVVM Madness: Commands

  - by JP

  I like MVVM. I don't love it, but like it. Most of it makes sense. But, I keep reading articles that encourage you to write a lot of code so that you can write XAML and don't have to write any code in the code-behind. Let me give you an example. Recently I wanted to hookup a command in my ViewModel to a ListView MouseDoubleClickEvent. I wasn't quite sure how to do this. Fortunately, Google has answers for everything. I found the following articles: http://blog.functionalfun.net/2008/09/hooking-up-commands-to-events-in-wpf.html http://joyfulwpf.blogspot.com/2009/05/mvvm-invoking-command-on-attached-event.html http://sachabarber.net/?p=514 http://geekswithblogs.net/HouseOfBilz/archive/2009/08/27/adventures-in-mvvm-ndash-binding-commands-to-any-event.aspx http://marlongrech.wordpress.com/2008/12/13/attachedcommandbehavior-v2-aka-acb/ While the solutions were helpful in my understanding of commands, there were problems. Some of the aforementioned solutions rendered the WPF designer unusable because of a common hack of appending "Internal" after a dependency property; the WPF designer can't find it, but the CLR can. Some of the solutions didn't allow multiple commands to the same control. Some of the solutions didn't allow parameters. After experimenting for a few hours I just decided to do this: private void ListView_MouseDoubleClick(object sender, MouseButtonEventArgs e) { ListView lv = sender as ListView; MyViewModel vm = this.DataContext as MyViewModel; vm.DoSomethingCommand.Execute(lv.SelectedItem); } So, MVVM purists, please tell me what's wrong with this? I can still Unit test my command. This seems very practical, but seems to violate the guideline of "ZOMG... you have code in your code-behind!!!!" Please share your thoughts. Thanks in advance.

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• input type file alternative and file upload best practice

  - by Ioxp

  Background: I am working on a file upload page that will extend an existing web portal. This page will allow for an end user to upload files from there local computer to our network (the files will not be stored on the web server, rather a remote workstation). The end user will have the ability to view the data that they have submitted by hyper-linking the files that have been uploaded on this page. Question 1: Is there an ASP.net alternative to the <input type="file" runat="server" /> HTML tag? The reason for asking is i would rather use an image button and display the file as an asp label on the portal to keep with a consistent style. Question 2: So i understand that giving the end user the ability to upload files to the server and then turn around to show them the data that they posted poses a security threat. So far i am using the id.PostedFile.ContentType and the file extension to reject the data if its not an accepted format (i.e. "text/plain", "application/pdf", "application/vnd.ms-excel", or "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"). Also the location where the files are uploaded to has a sufficient amount of virus and malware protection and this is not a concern. What, from the C# point of view, additional steps should i take to ensure that the end user cant take advantage and compromise the system in regards to allowing them to upload files?

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• EJB3 JNDI Lookup Failure in JEE application client

  - by Hank

  I'm trying to access an EJB3 from a JEE client-application, but keep getting nothing but lookup failures. My JEE Application 'CoreServer' is exposing a number of beans with remote interfaces. I have no problem accessing them from a Web Application deployed on the same Glassfish v3.0.1. Now I'm trying to access it from a client-application: public class Main { public static void main(String[] args) { CampaignControllerRemote bean = null; try { InitialContext ctx = new InitialContext(); bean = (CampaignControllerRemote) ctx.lookup("java:global/CoreServer/CampaignController"); } catch (Exception e) { System.out.println(e.getMessage()); } if (bean != null) { Campaign campaign = bean.get(361); if (campaign != null) { System.out.println("Got "+ campaign); } } } } When I run deploy it to Glassfish and run it from the appclient, I get this error: Lookup failed for 'java:global/CoreServer/CampaignController' in SerialContext targetHost=localhost,targetPort=3700,orb'sInitialHost=localhost,orb'sInitialPort=3700 However, that's exactly the same JNDI-name I use when I lookup the bean from the WebApplication (via SessionContext, not InitialContext - does that matter?). Also, when I deploy 'CoreServer', Glassfish reports: Portable JNDI names for EJB CampaignController : [java:global/CoreServer/CampaignController!mvs.api.CampaignControllerRemote, java:global/CoreServer/CampaignController] Glassfish-specific (Non-portable) JNDI names for EJB CampaignController : [mvs.api.CampaignControllerRemote, mvs.api.CampaignControllerRemote#mvs.api.CampaignControllerRemote] I tried all four names, none worked. Is the appclient unable to access beans with (only) Remote interfaces?

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• Writing an efficient cron job script utilizing Zend_Mail_Storage_Imap.

  - by fireeyedboy

  I'm new to the IMAP protocol and Zend_Mail_Storage and I'm writing a small php script for a cron job that should regularly poll an IMAP account and check for new messages, and send an e-mail if new messages have arrived. As you can imagine, I want to only poll the IMAP account for relevant messages, and I only want to send a new e-mail if new messages have arrived since the last polled new message. So I thought of keeping track of the last message I polled with some unique identifier for a message. But I'm a bit uncertain about whether the methods I want to utilize for this do what I expect them to do though. So my questions are: Does the iterator position of Zend_Mail_Storage_Imap actually resemble some IMAP unique identifier for messages, or is it simply only and internal position of Zend_Mail_Storage_Abstract? For instance, if I tell it to seek() to message 5 (which I stored from an earlier session) will it indeed seek to the appropriate message on the IMAP server, even if for instance messages have been deleted since last session? Would keeping track of this latest polled message id in a file suffice for a cron job that, say, polls the account every 5 or 10 minutes? Or is this too naive, and should I be using a database for instance. Or is there maybe a much easier way to keep track of such state with Zend_Mail_Storage_Abstract? Also, do I need to poll every IMAP folder? Or is everything accumulated when I poll INBOX? If you could shed some light on any of these matters, I'ld appreciate it. Thanks in advance.

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• Subsonic 3, MySql, won't update record.

  - by Warspawn

  [WebMethod] public string GetAuthToken(string username, string password) { var db = new LogicDB(); //var results = from u in db.Users // where u.Username == username && u.Password == password // select u; User u = db.Select .From<User>() .Where(UsersTable.UsernameColumn).IsEqualTo(username) .And(UsersTable.PasswordColumn).IsEqualTo(password) .ExecuteSingle<User>(); if (u == null) { return "{'success': false, 'reason': 'Invalid username and/or password.'}"; } else { // really there should only be one match... Guid code = Guid.NewGuid(); u.Securitycode = code.ToString(); u.Securityexp = System.DateTime.Now.AddHours(24); //u.Save(db.Provider); return "{'id':'" + u.Id.ToString() + "', 'code':'" + code.ToString() + "', 'exp':'" + u.Securityexp.ToString() + "'}" + "\n\n<br/><br/>" + u.GetDirtyColumns().ToArray().ToString(); } } When I run that, I keep getting: System.Collections.Generic.KeyNotFoundException: The given key was not present in the dictionary. This is when u.Save(db.Provider); is uncommented. And happens even with just u.Save(); or using the linq query above results instead.

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• jQuery .each() with multiple selectors - skip, then .empty() elements

  - by joe

  I'd like to remove all matching elements, but skip the first instance of each match: // Works as expected: removes all but first instance of .a jQuery ('.a', '#scope') .each ( function (i) { if (i > 0) jQuery (this).empty(); }); // Expected: removal of all but first instance of .a and .b // Result: removal of *all* instances of both .a and .b jQuery ('.a, .b', '#scope') .each ( function (i) { if (i > 1) jQuery (this).empty(); }); <div id="scope"> <!-- Want to keep the first instance of .a and .b --> <div class="a">[bla]</span> <div class="b">[bla]</span> <!-- Want to remove all the others --> <div class="a">[bla]</span> <div class="b">[bla]</span <div class="a">[bla]</span> <div class="b">[bla]</span ... </div> Any suggestions? Using jQuery() rather than $() because of conflict with 'legacy' code Using .empty() because .a contains JS I'd like to disable Stuck with jQuery 1.2.3 Thanks you!

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• Notifying view controller when subview touch events occur.

  - by Nebs

  I have a UIViewController whose view has a custom subview. This custom subview needs to track touch events and report swipe gestures. Currently I put touchesBegan, touchesMoved, touchesEnded and touchesCancelled in the subview class. With some extra logic I am able to get swipe gestures and call my handleRightSwipe and handleLeftSwipe methods. So now when I swipe within the subview it calls its local swipe handling methods. This all works fine. But what I really need is for the handleRightSwipe and handleLeftSwipe methods to be in the view controller. I could leave them in the subview class but then I'd have to bring in all the logic and data as well and that kind of breaks the MVC idea. So my question is is there a clean way to handle this? Essentially I want to keep my touch event methods in the subview so that they only trigger for that specific view. But I also want the view controller to be informed when these touch events (or in this case swipe gestures) occur. Any ideas? Thanks.

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• iphone global variables accessed from different views

  - by Rob

  Okay, so ultimately I want a program where the user can input simple data such as their name, date of birth, address, etc. and then have that information stay through multiple views. I am having the user input their information as UITextFields but their are multiple views that they are using to input the data. Is there a way that when the user inputs data in a UITextField - then moves to another view - then returns to the original view - that the data will still be in that UITextField? I figure since there are placeholders that there must be a command to show previously written text in that field when the viewController is called. Also, for the life of me, I can't figure out how to keep these variables global. I have read in multiple areas that I should define them in the AppDelegate as a simple: NSString *userName; NSString *userDOB; But how do I assign the strings from the UITextFields in a different view to these variables and then re-assign them to the UITextFields when the user returns to the place where they originally input them? (I apologize if I am not explaining this coherently - I am a bit of a newb)

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• Web crawler update strategy

  - by superb

  I want to crawl useful resource (like background picture .. ) from certain websites. It is not a hard job, especially with the help of some wonderful projects like scrapy. The problem here is I not only just want crawl this site ONE TIME. I also want to keep my crawl long running and crawl the updated resource. So I want to know is there any good strategy for a web crawler to get updated pages? Here's a coarse algorithm I've thought of. I divided the crawl process into rounds. Each round URL repository will give crawler a certain number (like , 10000) of URLs to crawl. And then next round. The detailed steps are: crawler add start URLs to URL repository crawler ask URL repository for at most N URL to crawl crawler fetch the URLs, and update certain information in URL repository, like the page content, the fetch time and whether the content has been changed. just go back to step 2 To further specify that, I still need to solve following question: How to decide the "refresh-ness" of a web page, which indicates the probability that this web page has been updated ? Since that is an open question, hopefully it will brought some fruitful discussion here.

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