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Articles indexed in April 2012

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• Jquery adding events

  - by JBone

  I want to add an event handler to some dynamically added elements. I simplified my problem into the basic code below. I am using the new JQuery 1.7 on feature to say "hey for all labels in the CancelSurvey id element call this notify function when they are clicked." function notify(event) { console.log(event.data.name); } $('#CancelSurvey').on('click', 'label', { name: $(this).attr("id") }, notify); I want to pass the id of the label as parameter "name". When I try to alert this it is undefined (they are defined in the html created). I believe that using the $(this) is not referencing the label selector in this case. It actually seems to be referencing the document itself. Any ideas on how to accomplish this?

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• using JMock to write unit test for a simple spring JDBC DAO

  - by Quincy

  I'm writing an unit test for spring jdbc dao. The method to test is: public long getALong() { return simpleJdbcTemplate.queryForObject("sql query here", new RowMapper<Long>() { public Long mapRow(ResultSet resultSet, int i) throws SQLException { return resultSet.getLong("a_long"); } }); } Here is what I have in the test: public void testGetALong() throws Exception { final Long result = 1000L; context.checking(new Expectations() {{ oneOf(simpleJdbcTemplate).queryForObject("sql_query", new RowMapper<Long>() { public Long mapRow(ResultSet resultSet, int i) throws SQLException { return resultSet.getLong("a_long"); } }); will(returnValue(result)); }}); Long seq = dao.getALong(); context.assertIsSatisfied(); assertEquals(seq, result); } Naturally, the test doesn't work (otherwise, I wouldn't be asking this question here). The problem is the rowmapper in the test is different from the rowmapper in the DAO. So the expectation is not met. I tried to put with around the sql query and with(any(RowMapper.class)) for the rowmapper. It wouldn't work either, complains about "not all parameters were given explicit matchers: either all parameters must be specified by matchers or all must be specified by values, you cannot mix matchers and values"

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• What happens when Npgsql connection pool reaches Max

  - by ClearCarbon

  Both the name of the connection string parameter and this blog post - http://fxjr.blogspot.co.uk/2010/04/npgsql-connection-pool-explained.html - lead me to believe that Npgsql wont exceed the MaxPoolSize value set in the connection string. However the docs (http://npgsql.projects.postgresql.org/docs/manual/UserManual.html) say "Max size of connection pool. Pooled connections will be disposed of when returned to the pool if the pool contains more than this number of connections. Default: 20" This suggests that the pool can actually grow larger than MaxPoolSize and it is in fact just a level at which Npgsql starts to aggressively remove connections from the pool as soon as they are returned. I've been searching to try and find an answer but I can find out exactly what happens when you reach MaxPoolSize. Anyone else know? edit: I should add we are using Npgsql 2.0.6.0 due to another dependency being supported only up to that version.

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• SQL - Updating records based on most recent date

  - by Remnant

  I am having difficulty updating records within a database based on the most recent date and am looking for some guidance. By the way, I am new to SQL. As background, I have a windows forms application with SQL Express and am using ADO.NET to interact with the database. The application is designed to enable the user to track employee attendance on various courses that must be attended on a periodic basis (e.g. every 6 months, every year etc.). For example, they can pull back data to see the last time employees attended a given course and also update attendance dates if an employee has recently completed a course. I have three data tables: EmployeeDetailsTable - simple list of employees names, email address etc., each with unique ID CourseDetailsTable - simple list of courses, each with unique ID (e.g. 1, 2, 3 etc.) AttendanceRecordsTable - has 3 columns { EmployeeID, CourseID, AttendanceDate, Comments } For any given course, an employee will have an attendance history i.e. if the course needs to be attended each year then they will have one record for as many years as they have been at the company. What I want to be able to do is to update the 'Comments' field for a given employee and given course based on the most recent attendance date. What is the 'correct' SQL syntax for this? I have tried many things (like below) but cannot get it to work: UPDATE AttendanceRecordsTable SET Comments = @Comments WHERE AttendanceRecordsTable.EmployeeID = (SELECT EmployeeDetailsTable.EmployeeID FROM EmployeeDetailsTable WHERE (EmployeeDetailsTable.LastName =@ParameterLastName AND EmployeeDetailsTable.FirstName =@ParameterFirstName) AND AttendanceRecordsTable.CourseID = (SELECT CourseDetailsTable.CourseID FROM CourseDetailsTable WHERE CourseDetailsTable.CourseName =@CourseName)) GROUP BY MAX(AttendanceRecordsTable.LastDate) After much googling, I discovered that MAX is an aggregate function and so I need to use GROUP BY. I have also tried using the HAVING keyword but without success. Can anybody point me in the right direction? What is the 'conventional' syntax to update a database record based on the most recent date?

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• how can i use gwt-test-utils to work with gin?

  - by krrish

  i tried using the steps in http://code.google.com/p/gwt-test-utils/wiki/HowToUseWithGIN and i'm using testNG but it is giving fallowing error java.lang.ExceptionInInitializerError at com.riskfocus.examples.JsonReaderWriterTest.setupGIN(JsonReaderWriterTest.java:59) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:80) at org.testng.internal.Invoker.invokeConfigurationMethod(Invoker.java:551) at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:213) at org.testng.internal.Invoker.invokeConfigurations(Invoker.java:138) at org.testng.internal.TestMethodWorker.invokeBeforeClassMethods(TestMethodWorker.java:175) at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:107) at org.testng.TestRunner.privateRun(TestRunner.java:768) at org.testng.TestRunner.run(TestRunner.java:617) at org.testng.SuiteRunner.runTest(SuiteRunner.java:334) at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:329) at org.testng.SuiteRunner.privateRun(SuiteRunner.java:291) at org.testng.SuiteRunner.run(SuiteRunner.java:240) at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:53) at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:87) at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185) at org.testng.TestNG.runSuitesLocally(TestNG.java:1110) at org.testng.TestNG.run(TestNG.java:1022) at org.testng.remote.RemoteTestNG.run(RemoteTestNG.java:109) at org.testng.remote.RemoteTestNG.initAndRun(RemoteTestNG.java:202) at org.testng.remote.RemoteTestNG.main(RemoteTestNG.java:173) Caused by: java.lang.UnsupportedOperationException: ERROR: GWT.create() is only usable in client code! It cannot be called, for example, from server code. If you are running a unit test, check that your test case extends GWTTestCase and that GWT.create() is not called from within an initializer or constructor. at com.google.gwt.core.client.GWT.create(GWT.java:91) at com.riskfocus.examples.client.model.StockPriceJsonReaderWriter.<clinit>(StockPriceJsonReaderWriter.java:12) ... 25 more

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• ORDER BY giving wrong order

  - by Cody Dull

  I have an SQL statement in my C# program that looks like: SELECT * FROM XXX.dbo.XXX WHERE Source = 'OH' AND partnum = '1231202085' ORDER BY partnum, Packaging, Quantity When running this query in SQL Server Management, the results are ordered as expected. My first 3 results have the same partnum and Packaging with Quantities of 32.0, 50.8, and 51.0. However, when I run the query from my program, the result set with quantity 50.8 is the first to be returned. The datatype of Quantity is decimal(18,9). I've tried cast, it doesn't appear to be a datatype problem. I cant figure out why its getting the middle quantity.

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• How to open email by x-gm-msgid in Gmail with Javascript

  - by Rui J

  I'm writing an extension which surfaces links to gmail messages. As the UI loads right in Gmail, I should be able to click on one of these links and have Gmail load it (without refreshing). I have "x-gm-msgid" available and theoretically, I should just be able to navigate to "https://mail.google.com/mail/u/0/#inbox/[x-gm-msgid]". I've tried using location.hash = "#inbox/[x-gm-msgid]" I've tried using history.pushState(null, null, "/mail/u/0/#inbox/[x-gm-msgid]") Neither of which works. Gmail just thwarts any attempt to change the URL (unless it is done via user interaction) Any thoughts on how to get around this restriction?

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• GLKit Memory Leak copywithZone

  - by TommyT39

  Running the instruments utility against the game I'm writing shows a bunch of memory leaks related to copy with Zone when I cycle through an array and draw some simple cube objects. Im not sure the best way to track this down as I'm new to OpenGL programming. My program is using ARC and is set to build for IOS 5. I am initializing GLKit to use OPenGl 2.0 and using the BafeEffect so I don't have to write my own shaders etc.. This shouldn't be rocket science. Im guessing that I must be not releasing something within the draw function. Below is the code to my draw function. Could you guys take a look and see if anything stands out as the problem? One other thing to note is that I'm using 15 different textures, the cubes can be 1 of 15 different ones. I have a property set on the cube class for the texture and I set it as I create the cube in there array. But I do load all 15 when my programs view did load starts.They are small .jps files that are less than 75k each and each cube uses the same texture all the way around so shouldn't be too big of an issue. Here is the code to my draw function: - (void)draw { GLKMatrix4 xRotationMatrix = GLKMatrix4MakeXRotation(rotation.x); GLKMatrix4 yRotationMatrix = GLKMatrix4MakeYRotation(rotation.y); GLKMatrix4 zRotationMatrix = GLKMatrix4MakeZRotation(rotation.z); GLKMatrix4 scaleMatrix = GLKMatrix4MakeScale(scale.x, scale.y, scale.z); GLKMatrix4 translateMatrix = GLKMatrix4MakeTranslation(position.x, position.y, position.z); GLKMatrix4 modelMatrix = GLKMatrix4Multiply(translateMatrix,GLKMatrix4Multiply(scaleMatrix,GLKMatrix4Multiply(zRotationMatrix, GLKMatrix4Multiply(yRotationMatrix, xRotationMatrix)))); GLKMatrix4 viewMatrix = GLKMatrix4MakeLookAt(0, 0, 1, 0, 0, -5, 0, 1, 0); effect.transform.modelviewMatrix = GLKMatrix4Multiply(viewMatrix, modelMatrix); effect.transform.projectionMatrix = GLKMatrix4MakePerspective(0.125*M_TAU, 1.0, 2, 0); effect.texture2d0.name = wallTexture.name; [effect prepareToDraw]; glEnable(GL_DEPTH_TEST); glEnable(GL_CULL_FACE); glEnableVertexAttribArray(GLKVertexAttribPosition); glVertexAttribPointer(GLKVertexAttribPosition, 3, GL_FLOAT, GL_FALSE, 0, triangleVertices); glEnableVertexAttribArray(GLKVertexAttribTexCoord0); glVertexAttribPointer(GLKVertexAttribTexCoord0, 2, GL_FLOAT, GL_FALSE, 0, textureCoordinates); glDrawArrays(GL_TRIANGLES, 0, 18); glDisableVertexAttribArray(GLKVertexAttribPosition); glDisableVertexAttribArray(GLKVertexAttribTexCoord0); }

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• iPodMusicPlayer playbackState inaccurate after odd conditions

  - by Shane Costello

  I have a simple music player app that runs into a really weird problem. First of all, while playing music and in the locked state, I allow the user to double click the Home button and use the locked iPod music controls. I did notice however that while in the locked state, my app doesn't receive any of its registered notifications. For the most part, this is fine anyway. But, if the user is playing music for at least 15 minutes (I'm not sure why but any less and this problem doesn't occur) while in the locked state, and using some kind of headphone or aux jack, then unplugs the headphone/aux jack while the device is still playing music, the iPodMusicPlayer will auto-pause. Which is exactly what I would want it to do, but after this happens, when the user unlocks their device and gives focus to the app again, the iPodMusicPlayer's playbackState is inaccurate. - (IBAction)playPause:(id)sender { if ([musicPlayer playbackState] == MPMusicPlaybackStatePlaying) { [musicPlayer pause]; } else { [musicPlayer play]; } } where musicPlayer = [MPMusicPlayerController iPodMusicPlayer]. Under normal circumstances, this runs perfectly fine. But after these conditions, my breakpoint will hit the condition for MPMusicPlaybackStatePlaying while the music is paused, and vice versa. The only way I've been able to fix this is to either make a new selection of music or to terminate the app and reopen. I've tried tons of a workarounds to fix this problem programmatically, but nothing turns out a 100% bug free fix. Does anyone have any clue as to why this happens in the first place?

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• What is Database Continuous Integration?

  - by SQLDev

  Although not everyone is practicing continuous integration, many have at least heard of the concept. A recent poll on www.simple-talk.com indicates that 40% of respondents are employing the technique. It is widely accepted that the earlier issues are identified in the development process, the lower the cost to the development process. The worst case scenario, of course, is for the bug to be found by the customer following the product release. A number of Agile development best practices have evolved to combat this problem early in the development process, including pair programming, code inspections and unit testing. Continuous integration is one such Agile concept that tackles the problem at the point of committing a change to source control. This can alternatively be run on a regular schedule. This triggers a sequence of events that compiles the code and performs a variety of tests. Often the continuous integration process is regarded as a build validation test, and if issues were to be identified at this stage, the testers would simply not 'waste their time ' and touch the build at all. Such a ‘broken build’ will trigger an alert and the development team’s number one priority should be to resolve the issue. How application code is compiled and tested as part of continuous integration is well understood. However, this isn’t so clear for databases. Indeed, before I cover the mechanics of implementation, we need to decide what we mean by database continuous integration. For me, database continuous integration can be implemented as one or more of the following: 1)      Your application code is being compiled and tested. You therefore need a database to be maintained at the corresponding version. 2)      Just as a valid application should compile, so should the database. It should therefore be possible to build a new database from scratch. 3)     Likewise, it should be possible to generate an upgrade script to take your already deployed databases to the latest version. I will be covering these in further detail in future blogs. In the meantime, more information can be found in the whitepaper linked off www.red-gate.com/ci If you have any questions, feel free to contact me directly or post a comment to this blog post.

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• Microsoft Presss Free E-Book - 12/April/2012 - Introducing Microsoft® SQL Server® 2012

  - by TATWORTH

  At http://shop.oreilly.com/product/0790145342201.do, I have spotted a free e-book "Introducing Microsoft® SQL Server® 2012 ". There is no indication as to how long this will be available for free, so I suggest get it ASAP. It is available in a number of other electronic formats besides PDF."Introducing Microsoft® SQL Server® 2012 explores the exciting enhancements and new capabilities engineered into SQL Server, ranging from improvements in operation to those in reporting and management. This book is for anyone who has an interest in SQL Server 2012 and wants to understand its capabilities, including database administrators, application developers, and technical decision makers."

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• Is there a relation between MS SQL Server client licenses and performance

  - by ramdaz

  I have a customer who has an .Net application running on MS SQL Server 2008, supplied by our company as a part of Microsoft Small Business Server. He started off with around 5 users, and hence we had not sold any extra licenses. Today there are 40 users, and there's performance degradation. An MS Consultant said that to improve performance you need to buy extra licenses. Is there a relationship. I am anyway planning to force the customer to buy extra licenses on legal grounds. But will there be any appreciable performance difference too? Advice welcome

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• tc u32 --- how to match L2 protocols in recent kernels?

  - by brownian

  I have a nice shaper, with hashed filtering, built at a linux bridge. In short, br0 connects external and internal physical interfaces, VLAN tagged packets are bridged "transparently" (I mean, no VLAN interfaces are there). Now, different kernels do it differently. I can be wrong with exact kernel verions ranges, please forgive me. Thanks. 2.6.26 So, in debian, 2.6.26 and up (up to 2.6.32, I believe) --- this works: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 flowid 1:200 Here, "kernel" matches two bytes in "protocol" field with 0x8100, but counts the beginning of ip packet as a "zero position" (sorry for my English, if I'm a bit unclear). 2.6.32 Again, in debian (I've not built vanilla kernel), 2.6.32-5 --- this works: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 at 20 flowid 1:200 Here, "kernel" matches the same for protocol, but counts offset from the beginning of this protocol's header --- I have to add 4 bytes to offset (20, not 16 for dst address). It's ok, seems more logical, as for me. 3.2.11, the latest stable now This works --- as if there is no 802.1q tag at all: tc filter add dev internal protocol ip parent 1:0 prio 100 \ u32 ht 1:64 match ip dst 192.168.1.100 flowid 1:200 The problem is that I couldn't find a way to match 802.1q tag so far. Matching 802.1q tag at past I could do this before as follows: tc filter add dev internal protocol 802.1q parent 1:0 prio 100 \ u32 match u16 0x0ed8 0x0fff at -4 flowid 1:300 Now I'm unable to match 802.1q tag with at 0, at -2, at -4, at -6 or like that. The main issue that I have zero hits count --- this filter is not being checked at all, "wrong protocol", in other words. Please, anyone, help me :-) Thanks!

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• Need a GUI app for group policy login script

  - by jayPal

  I wrote a C# 4.0 application that works on a Windows computer but when using Group Policy to set it as a login script, it does not run. The application is being called from the same location and using rsop.msc shows that the application should be run. I see that using C# 4.0 may be a little overkill for this purpose, but it just seems wrong to write a VB6 application to do the same thing. The requirements for the application states that there need to be specific GUI elements that can't be just text on the window. I need larger fonts and color elements. Is there something more appropriate (and current) that I should be using?

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• CentOS disable filesystem check: superblock last mount time is in the future

  - by Zac B

  I'm persistently getting the "Superblock last mount time is in the future" error when booting CentOS 6. I've seen other questions which ask how to resolve this error, but I know exactly why it's occurring: our development/testing VMs regularly have their date set to times far from the present, and have all of their filesystems remounted. What I want to know is: how do I disable all consistency checking for superblock mount time in centOS? I've tried tune2fs -i 0 <device> and setting buggy_init_scripts=1 in /etc/e2fsck.conf and neither has worked; the problem persists.

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• how to know who is accessing my system?

  - by calvin

  Is it possible to know if anyone is accessing any of folders or drives in my system(32 bit windows 2003)? I mean shared folders or non-shared folders, anything. And once if we know, how to deny access to particular host. For shared folders i know how to do, but if anyone is accessing some folder with proper credentials, i don't know how to control. Please ignore cases like bit torrent etc. All i wanted to know is if anyone is accessing my system folders in this way \\10.30.188.231\d$\calvin_docs with some valid username and password. I wanted to know ip/username of system who is accessing

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• Network Table assistance

  - by mitchnufc

  I am designing a small network and have came up with the following table I am just wondering if this seems right, would appreciate some feedback, thanks. Network/Router First IP Last IP Subnet Host Broadcast Router 1 162.10.0.1 162.10.0.7 255.255.255.248 162.10.0.0 162.10.0.8 Network 1 162.10.1.1 162.10.2.253 255.255.254.0 162.10.1.0 162.10.2.254 Network 2 162.10.0.9 162.10.0.14 255.255.255.248 162.10.0.8 162.10.0.15 Router 2 162.10.0.17 162.10.0.18 255.255.255.252 162.10.0.16 162.10.0.19 Network 3 162.10.0.21 162.10.0.146 255.255.255.128 162.10.0.20 162.10.0.147 Router one is the IP assigned by the ISP

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• Upgrade PHP to 5.3 in Ubuntu Server 8.04 with Plesk 9.5

  - by alcuadrado

  I have a dedicated server with Ubuntu 8.04, and really need to upgrade php to 5.3 version in order to deploy a new version of the system. This version of php is the default one in ubuntu 10.04, so I considered upgrading the OS, but after trying that, I lost my plesk installation, which annoyed my client. I tried adding the dotdeb.org repositories, but don't know why, after running an apt-get upgrade, I get this error: # apt-get upgrade Reading package lists... Done Building dependency tree Reading state information... Done The following packages have been kept back: libapache2-mod-php5 php5 php5-cgi php5-cli php5-common php5-curl php5-gd php5-imap php5-mysql php5-sqlite php5-xsl 0 upgraded, 0 newly installed, 0 to remove and 11 not upgraded. Any idea why is this happenning? Or do you know any alternative method (except compiling my own binaries) to upgrade php or update ubuntu without loosing plesk? Thanks!

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• Powershell Exchange script returning inconsistent results - PS weirdness

  - by Ian

  Maybe someone can shed some light on a bit of Powershell weirdness I've come across and can't explain. This PS script returns a list of exchange databases, their sizes and the number of mailboxes in each one: Get-MailboxDatabase | Select Server, StorageGroupName, Name, @{Name="Size (GB)";Expression={$objitem = (Get-MailboxDatabase $_.Identity); $path = "`\`\" + $objitem.server + "`\" + $objItem.EdbFilePath.DriveName.Remove(1).ToString() + "$"+ $objItem.EdbFilePath.PathName.Remove(0,2); $size = ((Get-ChildItem $path).length)/1048576KB; [math]::round($size, 2)}}, @{Name="Size (MB)";Expression={$objitem = (Get-MailboxDatabase $_.Identity); $path = "`\`\" + $objitem.server + "`\" + $objItem.EdbFilePath.DriveName.Remove(1).ToString() + "$"+ $objItem.EdbFilePath.PathName.Remove(0,2); $size = ((Get-ChildItem $path).length)/1024KB; [math]::round($size, 2)}}, @{Name="No. Of Mbx";expression={(Get-Mailbox -Database $_.Identity | Measure-Object).Count}} | Format-table –AutoSize If I add a simple 'sort name' before the 'format-table' my resulting table contains blanks where the database sizes and number of mailboxes should appear (not zeros, blank empty space).... but only in some rows, not all rows. Some rows contain numbers! If I put the '|sort name| ' after the initial 'get-mailboxdatabase' it works fine. Whats even weirder is if I do the following: Execute the above command Add the sort before format-table Execute the new command Execute the initial command again What I see is different amounts in each of the three cases - all of which are incorrect. Yet 1 and 3 are the same command and the only difference with 2 is a sort. 1 and 3 should, at a minimum, return the same results. I get blanks where I should have MBs If I add the sort after the get-mailboxdatabase, it always returns identical results (as it should). Can anyone suggest an explanation as to what may be going on? If its of any help in reading the expression, I've reformatted it here to make it a bit more readable: Get-MailboxDatabase | Select Server, StorageGroupName, Name, @{Name="Size (GB)";Expression={ $objitem = (Get-MailboxDatabase $_.Identity); $path = "`\`\" + $objitem.server + "`\" + $objItem.EdbFilePath.DriveName.Remove(1).ToString() + "$" + $objItem.EdbFilePath.PathName.Remove(0,2); $size = ((Get-ChildItem $path).length)/1048576KB; [math]::round($size, 2) }}, @{Name="Size (MB)";Expression={ $objitem = (Get-MailboxDatabase $_.Identity); $path = "`\`\" + $objitem.server + "`\" + $objItem.EdbFilePath.DriveName.Remove(1).ToString() + "$" + $objItem.EdbFilePath.PathName.Remove(0,2); $size = ((Get-ChildItem $path).length)/1024KB; [math]::round($size, 2) }}, @{Name="No. Of Mbx";expression={ (Get-Mailbox -Database $_.Identity | Measure-Object).Count }} | Format-table –AutoSize

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• How can I get past a BSOD 07b when booting from a VHD?

  - by Dan

  I thought I'd be clever and use disk2vhd at the end of my contract to backup my machine so I could easily restore it when I started my new contract, no matter what the buffoons had done with it in the meantime. I didn't count on them losing it. I'm trying to boot this new machine from the VHD. I get the windows logo and then a 07B bluescreen error, something to do with the disk, and it won't boot even in safe mode. The cure apparently is to run sysprep but I can't run that unless I can boot into the VHD so... I can mount the disk, is there a way to modify it

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• Weighted round robins via TTL - possible?

  - by Joe Hopfgartner

  I currently use DNS round robin for load balancing, which works great. The records look like this (I have a ttl of 120 seconds) ;; ANSWER SECTION: orion.2x.to. 116 IN A 80.237.201.41 orion.2x.to. 116 IN A 87.230.54.12 orion.2x.to. 116 IN A 87.230.100.10 orion.2x.to. 116 IN A 87.230.51.65 I learned that not every ISP / device treats such a response the same way. For example some DNS servers rotate the addresses randomly or always cycle them through. Some just propagate the first entry, others try to determine which is best (regionally near) by looking at the ip address. However if the userbase is big enough (spreads over multiple ISPs etc) it balances pretty well. The discrepancies from highest to lowest loaded server hardly every exceeds 15%. However now I have the problem that I am introducing more servers into the systems, that not all have the same capacities. I currently only have 1gbps servers, but I want to work with 100mbit and also 10gbps servers too. So what I want is I want to introduce a server with 10 GBps with a weight of 100, a 1 gbps server with a weight of 10 and a 100 mbit server with a weight of 1. I used to add servers twice to bring more traffic to them (which worked nice. the bandwidth doubled almost.) But adding a 10gbit server 100 times to DNS is a bit rediculous. So I thought about using the TTL. If I give server A 240 seconds ttl and server B only 120 seconds (which is about about the minimum to use for round robin, as a lot of dns servers set to 120 if a lower ttl is specified.. so i have heard) I think something like this should occour in an ideal scenario: first 120 seconds 50% of requests get server A -> keep it for 240 seconds. 50% of requests get server B -> keep it for 120 seconds second 120 seconds 50% of requests still have server A cached -> keep it for another 120 seconds. 25% of requests get server A -> keep it for 240 seconds 25% of requests get server B -> keep it for 120 seconds third 120 seconds 25% will get server A (from the 50% of Server A that now expired) -> cache 240 sec 25% will get server B (from the 50% of Server A that now expired) -> cache 120 sec 25% will have server A cached for another 120 seconds 12.5% will get server B (from the 25% of server B that now expired) -> cache 120sec 12.5% will get server A (from the 25% of server B that now expired) -> cache 240 sec fourth 120 seconds 25% will have server A cached -> cache for another 120 secs 12.5% will get server A (from the 25% of b that now expired) -> cache 240 secs 12.5% will get server B (from the 25% of b that now expired) -> cache 120 secs 12.5% will get server A (from the 25% of a that now expired) -> cache 240 secs 12.5% will get server B (from the 25% of a that now expired) -> cache 120 secs 6.25% will get server A (from the 12.5% of b that now expired) -> cache 240 secs 6.25% will get server B (from the 12.5% of b that now expired) -> cache 120 secs 12.5% will have server A cached -> cache another 120 secs ... i think i lost something at this point but i think you get the idea.... As you can see this gets pretty complicated to predict and it will for sure not work out like this in practice. But it should definitely have an effect on the distribution! I know that weighted round robin exists and is just controlled by the root server. It just cycles through dns records when responding and returns dns records with a set propability that corresponds to the weighting. My DNS server does not support this, and my requirements are not that precise. If it doesnt weight perfectly its okay, but it should go into the right direction. I think using the TTL field could be a more elegant and easier solution - and it deosnt require a dns server that controls this dynamically, which saves resources - which is in my opinion the whole point of dns load balancing vs hardware load balancers. My question now is... are there any best prectices / methos / rules of thumb to weight round robin distribution using the TTL attribute of DNS records? Edit: The system is a forward proxy server system. The amount of Bandwidth (not requests) exceeds what one single server with ethernet can handle. So I need a balancing solution that distributes the bandwidth to several servers. Are there any alternative methods than using DNS? Of course I can use a load balancer with fibre channel etc, but the costs are rediciulous and it also increases only the width of the bottleneck and does not eliminate it. The only thing i can think of are anycast (is it anycast or multicast?) ip addresses, but I don't have the means to set up such a system.

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• Does a VPN certificate request need to be encrypted

  - by Kernel Panic

  We have a Cisco 3000 VPN concentrator and use the Cisco VPN client to generate certificate requests, which we then create/authenticate on our certificate server. When the help desk generates the request, they sometimes email that to me, then I generate the certificate on the server. Does the request need to be encrypted? Until the certificate gets generated is there something in the request itself that would need to remain secret? Thank you.

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• Bridge Intrusion Prevention Vyatta

  - by Steve

  I am trying to create a bridge with ThreatStop, IPS and block a few ports. This bridge will sit in front of my servers. All is working apart from the IPS. I have read the documentation on configuring IPS, I have something configured that it hasn't complained about and nothing is logged so I believe that it isn't working. Is it possible to set-up IPS on a vyatta bridge? Also is it possible to read the logs/events with Snorby? I have also posted this on the Vyatta forums

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• Error sending email to alias with Postfix

  - by Burning the Codeigniter

  I'm on Ubuntu 11.04 64bit. I'm trying to set up Postfix on my VPS, which has been configured but when I send an email to an alias e.g. [email protected] it will send it to [email protected]. Now when I sent the email from my GMail account, I got this returned: Delivery to the following recipient failed permanently: [email protected] Technical details of permanent failure: Google tried to deliver your message, but it was rejected by the recipient domain. We recommend contacting the other email provider for further information about the cause of this error. The error that the other server returned was: 550 550 #5.1.0 Address rejected [email protected] (state 14). ----- Original message ----- DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:date:message-id:subject:from:to:content-type; bh=R1WtjVRWywfkWCR2g4QKbSjAfUaU9DAAMKbg9UAWqvs=; b=FiSfdhEaV4pEq/76ENlH4tvOgm35Ow3ulRg06kDYrIQTaDf3eOEgfSEgH25PjZuAj/ 7Hg1CL++o6Rt/tl80ZiR2AWekhA0zIn2JkqE7KssMG7WbBmMmbf8V9KDo2jOw+mZv+C/ KDKsQ65AudBZ/NYLDDpTT7MkKf8DzqeGCKj9MAct6sHDoC0wCciXYxNfTf+MKxrZvRHQ oICTkH5LOugKW9wEjPF2AoO8X0qgYmTLYeSUtXxu46VeNKRBGmdRkkpPOoJlQN9ank7i SW6kU6M9bk2bYOgKwV/YPsaantmYlu1XdmYx+kWeJkNJAyYOfXfZZ8WUJhbbFFD9bZCi m/hw== MIME-Version: 1.0 Received: by 10.101.3.5 with SMTP id f5mr783908ani.86.1334247306547; Thu, 12 Apr 2012 09:15:06 -0700 (PDT) Received: by 10.236.73.136 with HTTP; Thu, 12 Apr 2012 09:15:06 -0700 (PDT) Date: Thu, 12 Apr 2012 17:15:06 +0100 Message-ID: <CAN+9S2aB=xjiDxVZx3qYZoBMFD4XuadUyR_3OYWaxw1ecrZmOQ@mail.gmail.com> Subject: Test Email From: My Name <[email protected]> To: [email protected] Content-Type: multipart/alternative; boundary=001636c597eabfd21504bd7da8fd Now that I don't understand why it isn't working, my aliases are set up correctly - I see no error messages being produced in /var/log/mail.log or any other mail logs, which makes it harder for me to debug. This is my postfix configuration (postconf -n): alias_database = hash:/etc/aliases alias_maps = hash:/etc/aliases append_dot_mydomain = no biff = no config_directory = /etc/postfix inet_interfaces = all mailbox_command = procmail -a "$EXTENSION" mailbox_size_limit = 0 mydestination = $mydomain, $myhostname, localhost, localhost.localdomain, localhost mydomain = domain.com myhostname = localhost mynetworks = 192.168.1.0/24 127.0.0.0/8 readme_directory = no recipient_delimiter = + smtp_tls_session_cache_database = btree:${data_directory}/smtp_scache smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) smtpd_tls_cert_file = /etc/ssl/certs/ssl-cert-snakeoil.pem smtpd_tls_key_file = /etc/ssl/private/ssl-cert-snakeoil.key smtpd_tls_session_cache_database = btree:${data_directory}/smtpd_scache smtpd_use_tls = yes Does anyone know how to solve this specific issue?

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• Logging in as the same user multiple times in Remote Desktop Windows Server 2008

  - by Little_Johnn

  Quick question: I have a situation where I need to let multiple people on different PCs log into one server 2008 machine as administrator simultaneously over remote desktop. I have the CALs for it, it's just not set up correctly. When one user tries to log in, it boots the other out. What I need is to present to them a different session, just each as logged in as admin. Sorry for the slightly rambling post, I'm new here. Thanks!

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