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  • SSH broken after hostname change on EC2-hosted Ubuntu

    - by dimadima
    I changed my instance's hostname using the hostname utility and then set it in /etc/hostname so that the new name survives reboot. My main motivation was for differentiating between instances at the prompt using the \h format in PS1. EDIT I also changed permissions on my home directory. I made my home directory group writeable. END EDIT Now I can no longer SSH into the machine. The short of it is the error Permission denied (publickey). Running ssh -v, the more verbose output is: debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/dmitry/.ssh/id_rsa debug1: Authentications that can continue: publickey debug1: Trying private key: /Users/dmitry/.ssh/ec2key.pem debug1: read PEM private key done: type RSA debug1: Authentications that can continue: publickey debug1: No more authentication methods to try. Permission denied (publickey). Should I have done something after changing the hostname? Now I can't get into the instance! :(

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  • What are the benefits of using Boost.Phoenix?

    - by Denis Shevchenko
    Hello all! I can not understand what the real benefits of using Boost.Phoenix. When I use it with Boost.Spirit grammars, it's really useful: double_[ boost::phoenix::push_back( boost::phoenix::ref( v ), _1 ) ] When I use it for lambda functions, it's also useful and elegant: boost::range::for_each( my_string, if_ ( '\\' == arg1 ) [ arg1 = '/' ] ); But what are the benefits of everything else in this library? The documentation says: "Functors everywhere". I don't understand what is the good of it?

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  • arbitrary typed data in django model

    - by Dmitry Shevchenko
    I have a model, say, Item. I want to store arbitrary amount of attributes on it, like title, description, release_date. And i want them to be not just strings but have python type, so string, boolean, datetime etc. What are my options here? EAV pattern with separate name-value table won't work because of the same DB type across all values. JSONField can probably help, but it doesn't know about datetime, for example. Also i was looking at PickeField, it fits perfectly, but i'm a bit concerned about performance.

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  • post_save signal on m2m field

    - by Dmitry Shevchenko
    I have a pretty generic Article model, with m2m relation to Tag model. I want to keep count of each tag usage, i think the best way would be to denormalise count field on Tag model and update it each time Article being saved. How can i accomplish this, or maybe there's a better way?

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  • SSH broken after homedir permissions and hostname change on EC2-hosted Ubuntu

    - by dimadima
    I changed my instance's hostname using the hostname utility and then set it in /etc/hostname so that the new name survives reboot. My main motivation was for differentiating between instances at the prompt using the \h format in PS1. EDIT I also changed permissions on my home directory. I made my home directory group writeable. Now I can no longer SSH into the machine. The short of it is the error Permission denied (publickey). Running ssh -v, the more verbose output is: debug1: Authentications that can continue: publickey debug1: Next authentication method: publickey debug1: Offering RSA public key: /Users/dmitry/.ssh/id_rsa debug1: Authentications that can continue: publickey debug1: Trying private key: /Users/dmitry/.ssh/ec2key.pem debug1: read PEM private key done: type RSA debug1: Authentications that can continue: publickey debug1: No more authentication methods to try. Permission denied (publickey). Should I have done something after changing the hostname? Now I can't get into the instance! :(

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  • TeamCity build number independent artifacts

    - by Stanislav Shevchenko
    Hello, My TeamCity's nightly build produces more than 130Mb java doc as Build Configuration artifact. I have to share these artifact for other teams(developers), but javadoc every time has another one URL(I know that it's possible to get it like .lastFinished), and get's new place on Build Machine. Is it possible on each build replace old artifact with new one because I don't need need previous versions? And have independent from build version URL for accessing.

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  • Prolific USB-to-Serial Comm Port significantly slower under Windows 7 comparing to Windows XP

    - by Dmitry S
    Not sure if this question should be asked here or on SuperUser but if we get an answer here it may be useful for others here I am using a Prolific USB-to-Serial adapter based on the Prolific chip to use with a device on serial port. I have the latest version of the driver installed: 1.3.0 (2010-7-15). When I use my device with this adapter on my main Windows 7 (32bit) system it takes 8-9 seconds to send a command through to the device. However, when I do the same thing on a different Windows XP system (an old laptop I borrowed for testing) it only takes 2-3 seconds. I have made sure that the port settings and other variables are the same between systems. I also tested on a third laptop (also running Windows 7) and again got a significant delay. So the question is if anyone else experienced the same problem and found a solution. I would like to avoid moving to an XP system for what I need to achieve so that's my last option. Thanks in advance.

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  • Prolific USB-to-Serial Comm Port significantly slower under Windows 7 comparing to Windows XP

    - by Dmitry S
    I am using a Prolific USB-to-Serial adapter based on the Prolific chip to use with a device on serial port. I have the latest version of the driver installed: 1.3.0 (2010-7-15). When I use my device with this adapter on my main Windows 7 (32bit) system it takes 8-9 seconds to send a command through to the device. However, when I do the same thing on a different Windows XP system (an old laptop I borrowed for testing) it only takes 2-3 seconds. I have made sure that the port settings and other variables are the same between systems. I also tested on a third laptop (also running Windows 7) and again got a significant delay. So the question is if anyone else experienced the same problem and found a solution. I would like to avoid moving to an XP system for what I need to achieve so that's my last option.

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  • domain2.com redirects to domain1.com in Apache

    - by Dmitry Mikhaylov
    I created new virtual host, but when I try to request it, Apache redirects me to another virtual host. What could cause this problem? <VirtualHost XXX.XXX.XXX.XXX:80 > ServerName domain1.com AddDefaultCharset utf-8 CustomLog /var/www/httpd-logs/domain1.com.access.log combined DocumentRoot /home/user/www/domain1.com ErrorLog /var/www/httpd-logs/domain1.com.error.log ServerAdmin [email protected] ServerAlias www.domain1.com SuexecUserGroup user user AddType application/x-httpd-php .php .php3 .php4 .php5 .phtml AddType application/x-httpd-php-source .phps php_admin_value open_basedir "/home/user:." php_admin_value sendmail_path "/usr/sbin/sendmail -t -i -f [email protected]" php_admin_value upload_tmp_dir "/home/user/mod-tmp" php_admin_value session.save_path "/home/user/mod-tmp" ScriptAlias /cgi-bin/ /home/user/www/domain1.com/cgi-bin/ </VirtualHost> <VirtualHost XXX.XXX.XXX.XXX:80 > ServerName domain2.com CustomLog /dev/null combined DocumentRoot /home/user/www/domain2.com ErrorLog /dev/null ServerAdmin [email protected] ServerAlias www.domain2.com SuexecUserGroup user user AddType application/x-httpd-php .php .php3 .php4 .php5 .phtml AddType application/x-httpd-php-source .phps php_admin_value open_basedir "/home/user:." php_admin_value sendmail_path "/usr/sbin/sendmail -t -i -f [email protected]" php_admin_value upload_tmp_dir "/home/user/mod-tmp" php_admin_value session.save_path "/home/user/mod-tmp" </VirtualHost> "apache2ctl -S" output: VirtualHost configuration: XXX.XXX.XXX.XXX:80 is a NameVirtualHost default server domain1.com (/etc/apache2/apache2.conf:266) port 80 namevhost domain1.com (/etc/apache2/apache2.conf:266) port 80 namevhost domain2.com (/etc/apache2/apache2.conf:284) XXX.XXX.XXX.XXX:443 is a NameVirtualHost default server domain1.com (/etc/apache2/apache2.conf:246) port 443 namevhost domain1.com (/etc/apache2/apache2.conf:246) wildcard NameVirtualHosts and _default_ servers: *:443 is a NameVirtualHost default server www.example.com (/etc/apache2/apache2.conf:239) port 443 namevhost www.example.com (/etc/apache2/apache2.conf:239) *:80 is a NameVirtualHost default server domain1.com (/etc/apache2/sites-enabled/000-default:1) port 80 namevhost domain1.com (/etc/apache2/sites-enabled/000-default:1)

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  • Server extremely lags and logs bunch of 'internal dummy connection'

    - by Dmitry
    Having a web-server (don't know actually whoset it up, it's my heritage). Few hours ago it started working very (extremely!) slow, mysqld oftenly fails requests. /var/log/mysqld.log is empty (well, it says, mysqld started, and so on, but nothing regarding today) /var/log/apache2/access_log is full of such lines: ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" ::1 - - [30/Nov/2011:10:15:05 +0100] "GET / HTTP/1.0" 200 1 "-" "Apache/2.2.3 (Linux/SUSE) (internal dummy connection)" Guys, what's that? How to heal this? I read internal dummy connections happen sometimes, but sending internal requests at 1000/sec frequency isn't freaking normal!How to find out the reason of this?

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  • Hardware for multipurpose home server

    - by Michael Dmitry Azarkevich
    Hi guys, I'm looking to set up a multipurpose home server and hoped you could help me with the hardware selection. First of all, the services it will provide: Hosting a MySQL database (for training and testing purposes) FTP server Personal Mail Server Home media server So with this in mind I've done some research, and found some viable solutions: A standard PC with the appropriate software (Either second hand or new) A non-solid state mini-ITX system A solid state, fanless mini-ITX system I've also noted the pros and cons of each system: A standard second hand PC with old hardware would be the cheapest option. It could also have lacking processing power, not enough RAM and generally faulty hardware. Also, huge power consumption heat generation and noise levels. A standard new PC would have top-notch hardware and will stay that way for quite some time, so it's a good investment. But again, the main problem is power consumption, heat generation and noise levels. A non-solid state mini-ITX system would have the advantages of lower power consumption, lower cost (as far as I can see) and long lasting hardware. But it will generate noise and heat which will be even worse because of the size. A solid state, fanless mini-ITX system would have all the advantages of a non-solid state mini-ITX but with minimal noise and heat. The main disadvantage is the read\write problems of flash memory. All in all I'm leaning towards a non-solid state mini-ITX because of the read\write issues of flash memory. So, after this overview of what I do know, my questions are: Are all these services even providable from a single server? To my best understanding they are, but then again, I might be wrong. Is any of these solutions viable? If yes, which one is the best for my purposes? If not, what would you suggest? Also, on a more software oriented note: OS wise, I'm planning to run Linux. I'm currently thinking of four options I've been recommended: CentOS, Gentoo, DSL (Damn Small Linux) and LFS (Linux From Scratch). Any thoughts on this? Any other distro you would recomend? Regarding FTP services, I've herd good things about FileZila. Anyone has any experience with that? Do you recommend it? Do you recommend something else? Regarding the Mail service, I know nothing about this except that it exists. Any software you recommend for this task? Home media, same as mail service. Any recommended software? Thank you very much.

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  • How do I block requests to Apache on a network interface?

    - by Dmitry Dulepov
    The problem: I have a local Apache instance on my Macbook Pro. I need it to listen on all network interfaces except en0 and en1 (basically, listen on lo and vnicX from Parallels). I know about "Listen *:80" but this is not a solution in this particular case. The only thing I could imagine if to use OS X firewall to block incoming requests to Apache on those interfaces. But I could not find any working examples and could not make such rules myself. Could somebody help, please?

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  • ArchBeat Link-o-Rama for 2012-03-20

    - by Bob Rhubart
    SOA! SOA! SOA!; OSB 11g Recipes and Author Interviews www.oracle.com Featured this week on the OTN Architect Homepage, along with the latest articles, white papers, blogs, events, and other resources for software architects. OTN Virtual Developer Day - Java - APAC Tuesday March 27th, 2012. 9:30 am to 2:00pm IST / 12:00pm to 4.30pm SGT / 3.00pm - 7.30pm AEDT Oracle Virtualization Newsletter - March Edition www.oracle.com News, white papers, webcasts, events, blogs, and more -- all focused on Oracle Virtualization products. 7 Signs an Enterprise is getting the post-PC thing | Ron Tolido www.capgemini.com Capgemini's Ron Tolido shares "indicators for enterprises that actually understand the power of mobility and the post-PC era." Gartner: Personal Cloud Will Replace the Personal Computer as the Center of Users' Digital Lives www.gartner.com The change, says Gartner, "will require enterprises to fundamentally rethink how they deliver applications and services to users." Northeast Ohio Oracle Users Group 2 Day Seminar - May 14-15 - Cleveland, OH www.neooug.org More than 20 sessions over 4 tracks, featuring 18 speakers, including Oracle ACE Director Cary Millsap, Oracle ACE Director Rich Niemiec, and Oracle ACE Stewart Brand. Register before April 15 and save. Oracle Hardware Systems: The Extreme Performance Tour - Dates and Locations Worldwide www.oracle.com Get the inside track on Oracle's hardware strategy and product roadmap from the people who know Oracle hardware best. And be sure to meet our global experts in the Extreme Performance exhibition area. Click the link for dates and locations worldwide. Oracle's ZFS Storage Appliance Simulator | Steen Schmidt blogs.oracle.com Take a test drive. Oracle Access Manager 11g - useful links | Dmitry Nefedkin blogs.oracle.com Dmitry Nefedkin shares a list of links to useful resources for those interested in Oracle Access Manager 11g. Oracle Linux Online Forum - March 27 event.on24.com Date: Tuesday, March 27, 2012 Time: 9:30 AM PT / 12:30 PM ET Leading Innovations in Enterprise Linux hosted by Oracle Executives Edward Screven and Wim Coekaerts. Customer Presentation: How Oracle Helps Reduce Cost and Improve Performance of Database Applications at Progressive Insurance Speaker: John Dome What's New in Oracle Linux Speakers: Waseem Daher, Chris Mason, Elena Zannoni, Lenz Grimmer Get More Value from your Linux Vendor Speakers: Sergio Leunissen, Chris Mason, Monica Kumar Thought for the Day "I have yet to see any problem, however complicated, which, when looked at in the right way, did not become still more complicated." —Poul Anderson

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  • How to delete row in TTTableViewController (Three20)

    - by Dmitry
    Hi, The Three20 is great library. It's making the work with tables very easy. But one gap that I noticed - is deletion of rows, with animation. I spent many hours trying to do this, and this is what I'm doing: // get current index patch UITableView* table = [super tableView]; NSIndexPath *indexPath = [table indexPathForSelectedRow]; //delete row in data source TTListDataSource * source = (TTListDataSource *)self.dataSource; [source.items removeObjectAtIndex:indexPath.row]; // delete row from the table, with animation [table deleteRowsAtIndexPaths:[NSArray arrayWithObject:indexPath] withRowAnimation:UITableViewRowAnimationFade]; After this code runs the error appears: [NSCFArray objectAtIndex:]: index (0) beyond bounds (0) I'm using the class inherited from the TTTableViewController. And I doesn't implement the DataSourceDelegate or TableViewDelegate because I'm using the Three20 as much as possible. So, this is how I create datasource: for(NSDictionary *album in (NSArray *)albums){ TTTableRightImageItem *item = [TTTableRightImageItem itemWithText:@"name" imageURL:@"image url" defaultImage:nil imageStyle:TTSTYLE(rounded) URL:@"url of selector where I actually catch the tap on a row"]; [tableItems addObject:item]; } self.dataSource = [TTListDataSource dataSourceWithItems:tableItems]; I read this article (article) but it doesn't help :( So, I know that this is very simple for gurus from this site. Can you just give me advanced sample of how to do this Thanks

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  • From Xcode 3.2.2 to Xcode 3.2.3

    - by Dmitry
    Hi Everyone! Yesterday I felt in big issue that happens with all my projects. After I installed new Xcode 3.2.3 (for iPhone OS 4), all my projects started to spit out the "referenced from:" errors. I noticed that in new Xcode all the iPhone SDK versions earlier than 3.2 removed. But I have a projects that built perfectly for iPhone SDK 3.2 on the Xcode 3.2.2 but has errors building for iPhone SDK 3.2 on the Xcode 3.2.3. Thanks in advance!!!

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  • WCF service The maximum array length quota (16384) has been exceeded

    - by dmitry.baranovsky
    I have a wsf service and a client application. While trying to communicate the client and the service I've gotten the following message: "The formatter threw an exception while trying to deserialize the message: There was an error while trying to deserialize parameter http://tempuri.org/:blob. The InnerException message was 'There was an error deserializing the object of type FileBlob. The maximum array length quota (16384) has been exceeded while reading XML data. This quota may be increased by changing the MaxArrayLength property on the XmlDictionaryReaderQuotas object used when creating the XML reader. Line 1, position 25931.'. Please see InnerException for more details." I have the customBinding element and it doesn't allow me to insert "readerQuotas" section. In both the client and service configs I have the following binding element: <customBinding> <binding name="LicenseServiceBinding" closeTimeout="00:01:00" openTimeout="00:01:00" receiveTimeout="00:10:00" sendTimeout="00:01:00"> <security authenticationMode="UserNameOverTransport"> <localClientSettings maxClockSkew="00:07:00" /> <localServiceSettings maxClockSkew="00:07:00" /> </security> <windowsStreamSecurity /> <httpsTransport maxReceivedMessageSize="2147483646"/> </binding> </customBinding> Thanks in advance for any help:)

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  • LDAP socket keep-alive

    - by Dmitry Khalatov
    We are using OpenLDAP client library to conect to an LDAP server. The problem is that if there is no activity for some time, server (or firewall in the middle) drops TCP connection. Our current implementation of "keep-alive" just does search for baseDN from time to time - any better ideas ?

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  • JpegBitmapEncoder.Save() throws exception when writing image with metadata to MemoryStream

    - by Dmitry
    I am trying to set up metadata on JPG image what does not have it. You can't use in-place writer (InPlaceBitmapMetadataWriter) in this case, cuz there is no place for metadata in image. If I use FileStream as output - everything works fine. But if I try to use MemoryStream as output - JpegBitmapEncoder.Save() throws an exception (Exception from HRESULT: 0xC0000005). After some investigation I also found out what encoder can save image to memory stream if I supply null instead of metadata. I've made a very simplified and short example what reproduces the problem: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; using System.Drawing; using System.Drawing.Imaging; using System.Windows.Media.Imaging; namespace JpegSaveTest { class Program { public static JpegBitmapEncoder SetUpMetadataOnStream(Stream src, string title) { uint padding = 2048; BitmapDecoder original; BitmapFrame framecopy, newframe; BitmapMetadata metadata; JpegBitmapEncoder output = new JpegBitmapEncoder(); src.Seek(0, SeekOrigin.Begin); original = JpegBitmapDecoder.Create(src, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad); if (original.Frames[0] != null) { framecopy = (BitmapFrame)original.Frames[0].Clone(); if (original.Frames[0].Metadata != null) metadata = original.Frames[0].Metadata.Clone() as BitmapMetadata; else metadata = new BitmapMetadata("jpeg"); metadata.SetQuery("/app1/ifd/PaddingSchema:Padding", padding); metadata.SetQuery("/app1/ifd/exif/PaddingSchema:Padding", padding); metadata.SetQuery("/xmp/PaddingSchema:Padding", padding); metadata.SetQuery("System.Title", title); newframe = BitmapFrame.Create(framecopy, framecopy.Thumbnail, metadata, original.Frames[0].ColorContexts); output.Frames.Add(newframe); } else { Exception ex = new Exception("Image contains no frames."); throw ex; } return output; } public static MemoryStream SetTagsInMemory(string sfname, string title) { Stream src, dst; JpegBitmapEncoder output; src = File.Open(sfname, FileMode.Open, FileAccess.Read, FileShare.Read); output = SetUpMetadataOnStream(src, title); dst = new MemoryStream(); output.Save(dst); src.Close(); return (MemoryStream)dst; } static void Main(string[] args) { string filename = "Z:\\dotnet\\gnom4.jpg"; MemoryStream s; s = SetTagsInMemory(filename, "test title"); } } } It is simple console application. To run it, replace filename variable content with path to any .jpg file without metadata (or use mine). Ofc I can just save image to temporary file first, close it, then open and copy to MemoryStream, but its too dirty and slow workaround. Any ideas about getting this working are welcome :)

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  • Where Firefox extensions store data?

    - by Dmitry
    I want to write plugin for GNOME Do, that will work with Firefox extensions data (for example, with URL Alias patterns). I have looked through files in my profile folder (~/.mozilla/firefox/.default/), but haven't found anything related. Can anybody help me?

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