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• setting up rhel 5.x RPM build server for mortal users

  - by Chen Levy

  My task is to setup a RHEL 5.x build host, that can build RPMs for mortal users. On RHEL 6.x with rpm version 4.8, I have in /usr/lib/macros: # Path to top of build area. %_topdir %{getenv:HOME}/rpmbuild On RHEL 5.x with rpm version 4.4, the %{getevn:HOME} is not available. I know that I can use /home/someuser/.rpmmacros: %_topdir /home/someuser/rpmbuild and this will work for that user, however I don't want to do this for every user separately. Moreover, since .rpmmacro will not expand ${HOME} or ~ I suspect it is unsafe to use those. This in turn make /etc/skel unstable for this task (or so I suspect). So in short, my question is: How to setup RHEL 5.x host that allow all users to build RPM packages in their home directory?

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• Recovering data from mangodb raw files

  - by Jin Chen

  we use mongodb for our database and set the replset(two servers), but we mistakenly deleted some raw files that under /path/to/dbdata on both servers, after we used tool to get back the deleted files(we ran the extundelete on both server and mix the result together), like database.1, database.2 etc. we could not start the mongod, it raised the following error when starting mongod or executing mongodump, here is the console output: root@mongod:/opt/mongodb# mongodump --repair --dbpath /opt/mongodb -d database_production Thu Aug 21 16:22:43.258 [tools] warning: repair is a work in progress Thu Aug 21 16:22:43.258 [tools] going to try and recover data from: database_production Thu Aug 21 16:22:43.262 [tools] Assertion failure isOk() src/mongo/db/pdfile.h 392 0xde1b01 0xda42fd 0x8ae325 0x8ac492 0x8bd8e0 0x8c1c51 0x80e345 0x80e607 0x80e6a4 0x6db92a 0x6dc1ff 0x6e0db9 0xd9e45e 0x6ccdc7 0x7f499d856ead 0x6ccc29 mongodump(_ZN5mongo15printStackTraceERSo+0x21) [0xde1b01] mongodump(_ZN5mongo12verifyFailedEPKcS1_j+0xfd) [0xda42fd] mongodump(_ZNK5mongo7Forward4nextERKNS_7DiskLocE+0x1a5) [0x8ae325] mongodump(_ZN5mongo11BasicCursor7advanceEv+0x82) [0x8ac492] mongodump(_ZN5mongo8Database19clearTmpCollectionsEv+0x160) [0x8bd8e0] mongodump(_ZN5mongo14DatabaseHolder11getOrCreateERKSsS2_Rb+0x7b1) [0x8c1c51] mongodump(_ZN5mongo6Client7Context11_finishInitEv+0x65) [0x80e345] mongodump(_ZN5mongo6Client7ContextC1ERKSsS3_b+0x87) [0x80e607] mongodump(ZN5mongo6Client12WriteContextC1ERKSsS3+0x54) [0x80e6a4] mongodump(_ZN4Dump7_repairESs+0x3a) [0x6db92a] mongodump(_ZN4Dump6repairEv+0x2df) [0x6dc1ff] mongodump(_ZN4Dump3runEv+0x1b9) [0x6e0db9] mongodump(_ZN5mongo4Tool4mainEiPPc+0x13de) [0xd9e45e] mongodump(main+0x37) [0x6ccdc7] /lib/x86_64-linux-gnu/libc.so.6(__libc_start_main+0xfd) [0x7f499d856ead] mongodump(__gxx_personality_v0+0x471) [0x6ccc29] assertion: 0 assertion src/mongo/db/pdfile.h:392 Thu Aug 21 16:22:43.271 dbexit: Thu Aug 21 16:22:43.271 [tools] shutdown: going to close listening sockets... Thu Aug 21 16:22:43.271 [tools] shutdown: going to flush diaglog... Thu Aug 21 16:22:43.271 [tools] shutdown: going to close sockets... Thu Aug 21 16:22:43.272 [tools] shutdown: waiting for fs preallocator... Thu Aug 21 16:22:43.272 [tools] shutdown: closing all files... Thu Aug 21 16:22:43.273 [tools] closeAllFiles() finished Thu Aug 21 16:22:43.273 [tools] shutdown: removing fs lock... Thu Aug 21 16:22:43.273 dbexit: really exiting now my env: 1) Debian 3.2.35-2 x86_64(it's a XEN virtual machine) 2) mongodb 2.4.6 and we did not delete the .0 and .ns files we tried to create a new database with the same name and copy these db.ns and db.2, db.3 to the new db, we still met the same error. is there any way to check the valid of raw .ns and datafiles, and how to recover the database?

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• Can ZenOSS integrate Ganglia smoothly?

  - by chen

  I like Ganglia for its Gmetric function, and I like its multi-layer capability. But Ganglia does not have healthiness check, alerting and etc. for the server monitor functionality. So it would be great to bring this two species together. Sure, we can install Ganglia, and then install ZenOSS. But is there a plugin or something that can smoothly integrate them together? At least integration at the presentation level. Thanks

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• Any program to help me check whether an ethernet channel can support full-length VLAN packet?

  - by Jimm Chen

  Sometimes, I have to face such a situation that I need to quickly and explicitly know whether a full length VLAN packet can traverse between two RJ45 ports. Yes, I mean 802.1Q ethernet frame with Etype=81 00 (diagram below). What I can do now is: Get two Windows PCs, for each PC, intall Intel Gigabit NIC and Intel specific driver to create a virtual NIC, with VLAN ID=3 assigned. Then connect the two PCs to each of the two RJ45 port. Finally execute ping to generate a full-length ethernet packet. ping -f -l 1472 <dest-IP> This way, I can be sure that the sent packet has the maximum "IP data payload" of 1500 bytes(8 bytes of ICMP header and 1472 bytes of ICMP data). If the ping gets reply, I know that the ethernet channel support full-length VLAN packet. From my experiment, some home switch or broad band routers(e.g. Linksys WRT54G) does not support full-length VLAN packet switching, so only ping -f -l 1468 succeeds. You see, I have to use an expensive Intel NIC to carry on that test, quite inconvenient. You know, for most laptop today, they do not equip an Intel NIC, and, even it is an Intel NIC, Intel VLAN driver, Intel has limitations on the models on which VLAN driver can be installed. So, my question is: Is there a small program that can let me send a full-length VLAN packet without installing a dedicated VLAN driver? Or better, the program has a stock feature that does the very job for my situation. Windows programs preferred, Linux solution welcome. Simpler the program, the better. Thank you.

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• Is there any problem using the ftpd that comes with Kerberos on CentOS?

  - by Chen Levy

  Hello, I need to configure ftpd on a CentOS 5.3 host to allow anonymous ftp (upload and download) from a well defined directory. I wish the setup to be as simple as possible, and to introduce as little new dependencies as possible. Scanning the current server configuration, I found the ftpd server that comes as part of the Kerberos workstation: > rpm -ql krb5-workstation | grep ftpd$ /usr/kerberos/sbin/ftpd Is there any reason I could or should not use this ftp server?

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• GNU screen, how to get current sessionname programmatically

  - by Jimm Chen

  [ This can be considered step 2 of my previous question Is it possible to change GNU screen session name after created? ] Actually, I'd like to write a script that can display current screen session name and change current session name. For example: sren armcross It will change the session name to armcross (ARM gcc cross compiler) and output something like: screen session name changed from '25278.pts-15.linux-ic37' to 'armcross' So, the key question now is how to get current session name. Not only for display the old session name, but according to Is it possible to change GNU screen session name after created? , I have to know it(pass to -d -r) before I can change it to something else. Can we use $STY for current session name? No. $STY will not change after you have changed the session name to a user-defined one. However, for command screen -d -r <oldsessname> -X sessionname armcross should be the user-defined name(if ever defined) instead of $STY, otherwise, screen spouts error "No screen session found." Maybe, there is a verbose way, use screen -list to list all sessions(user-defined name listed), then, match the pid part from $STY against those listed sessions and we will find current session's user-defined name. It should not be so verbose for such a straightforward question. Don't you think so? The -d -D and -r -R options seems to expose too much implementation detail to screen's user. It seems, to rename a session, you have to detach it, then do the rename, then reattach it. Right? My env: opensuse 11.3, GNU screen 4.00.03 (FAU) 23-Oct-06 Thank you.

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• How to set specific environment variables for Apache service run on Windows

  - by Jimm Chen

  I'm facing a problem. I use xampp 1.7.7 on Windows which installs a Apache service. I find that I have to some tweak to have all PHP modules load properly. For example, php_ldap.dll cannot be loaded. It is mysterious why it cannot be loaded until I tried to run httpd.exe from command line, which reveals that libsasl.dll cannot be founded. Actually, there exist D:\xampp\php\libsasl.dll but httpd.exe cannot find it. OK. The best way is to add D:\xampp\php to PATH env-var. Now my question is: How do I set a specific PATH value for that specific Apache service but not system wide. -- because I think it is better not to disturb other processes with that extra PATH value. Is there a general way to do that for a specific Windows service? or, is there a Apache specific way to load extra env-var settings from some specific configuration files?

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• Is there keyboard shortcut to move input focus to the Google Search box?

  - by Chen Jun

  I'm searching on Google a lot. I find it very annoying to move my mouse to the search box and click once so that I can input another search term. I did Googled some time, but no one seems to be annoyed with this, quite unbelievable. I'm using Firefox 8 and Chrome 16, on Windows 7. If you know Atlassian Confluence, you might probably know that pressing / will move input focus to the upper right search box, very convenient for a keyboard shortcut hobbyist . Try it here.

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• Possible to use DRBD on two ESXi virtualized servers?

  - by chen

  I have two servers (attached disks have been set up as hardware RAID1 for disk device level failure resilience). Here is the setup in my mind: 1) Install ESXi on each of the physical server, M1, M2; 2) Start one VM on each of the ESXi virtualized physical server V1, V2; 3) Install the DRDB drivers within V1 and V2. Essentially, this is a "virtualizing machine running DRBD in the VM's instead of bare metal hardware" idea. My question is whether the above setup can achieve the same "networked RAID1" goal that DRDB can achieve in the bare-metal physical machines (http://www.drbd.org/). Thanks. [EDIT] I found this (http://serverfault.com/questions/49305/drbd-experimentation-and-virtualization) is a similar question, but the answer does not seem to be firmative enough for me to follow.

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• Google Apps, SPF, softfail problem (validates with validation tools, but still softfails otherwise)

  - by mq.chen

  Hi, I guess this is probably a commonly asked and boring question but I'm really at a loss and I don't know what else to do. This might be a duplicate of other questions, but none of the solutions worked for me. I've Googled around and read just about anything I could find but I'm still puzzled as to why it doesn't work. The gist of my problem is that I have set-up Google Apps for a client of mine with the domain fintan.dk. Everthing works just excellent, except emails sent from *@fintan.dk (either with the Gmail web-interface or desktop client) to a non-Google Apps email gets a softfail (I have sent to my University email, an email hosted at MediaTemple and even Hotmail). The emails gets a pass when sent to a Google Apps or Gmail address though... (All emails from that domain are sent via email clients.) So this is what I have done so far: I've added the SPF record Google recommended (v=spf1 include:_spf.google.com ~all), waited several days hoping it would a DNS update delay problem. Now, three days later there is no change. I have verified the settings in the desktop clients several times. I have validated the records with validation tools like the SPF Query Tool, [email protected] and [email protected]. All of them validate and gives a pass, saying there shouldn't be a problem, but strangely there still is. So, I really don't know what else to do. Any help is very much appreciated. Thank you in advance!

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• Nginx save file to local disk

  - by Dean Chen

  My case is: In our China company, we have to access one web server in USA headquarter through Internet. But network is too slow, and we download many big image files. All our developers have to wait. So we want to setup a Nginx which acts as reverse proxy, its upstream is our USA web server. Question is can we make Nginx save the image files from USA web server into its local disk? I mean let Nginx act as one cache server.

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• Only allow the POST method for a specific file in a directory

  - by Dave Chen

  I have one file that should only be accessible via the POST method. /var/www/folder/index.php The document root is /var/www/ and index.php is nested inside a folder. My configurations are as follows: <Directory "/var/www/folder"> <Files "index.php"> order deny,allow Allow from all <LimitExcept POST> Deny from all </LimitExcept> </Files> </Directory> I visit my server at 127.0.0.1/folder but I can GET and POST the file just like normal. I've also tried reversing the order, order allow,deny, require, limitexcept and limit. How can I only allow POST requests to be processed by one file in a folder?

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• Can I disable the message line when launching ``screen -RR``

  - by Jimm Chen

  screen -RR is great. It does one of the two thing automatically: If there is any detached screen session, it picks up one can attach to it. If there is no detached screen session(no session yet, or all have been attach to other terminal), it creates a new screen session automatically. I use Windows server Remote Desktop a lot, screen -RR behaves almost the same when a client connects to a remote desktop server. It is natural and I like it. However, when screen -RR determines it should create a new session, it displays a message line at terminal bottom for 5 second. I'd like to suppress this message line because it brings us little benefit. In my opinion, a remote user can always easily distinguish whether he is connected to a resumed session(a piled-up display) or a newly created session(a clean display) from what he sees in the terminal window. So, is there a way to suppress the nag "New screen..." ? Just suppress that very one, not suppress message line globally. My env: opensuse 11.3, GNU screen 4.00.03 (FAU) 23-Oct-06

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• How do I know I'm running inside a linux "screen" or not?

  - by Jun Chen

  The "screen" refers to a program mentioned in How to reconnect to a disconnected ssh session . That is a good facility. But there is a question I'd really like to know. How do I know whether I'm running inside a "screen"? The difference is: If yes, I know I can safely close current terminal window, e.g., close a PuTTY window, without losing my shell(Bash etc) session. If no, I know I have to take care of any pending works before I close the terminal window. Better, I'd like this status to be displayed in PS1 prompt so that I can see it any time automatically.

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• New line and returns ignored in setMessageBody

  - by Magic Bullet Dave

  Am I doing something dumb? I can pre-fill and email ok but the "\r\n" is ignored in the emailBody: - (void) sendEventInEmail { MFMailComposeViewController *picker = [[MFMailComposeViewController alloc] init]; picker.mailComposeDelegate = self; NSString *emailSubject = [eventDictionary objectForKey:EVENT_NAME_KEY]; [picker setSubject:emailSubject]; // Fill out the email body text NSString *iTunesLink = @"http://itunes.apple.com/gb/app/whats-on-reading/id347859140?mt=8"; // Link to iTune App link NSString *content = [eventDictionary objectForKey:@"Description"]; NSString *emailBody = [NSString stringWithFormat:@"%@\r\nSent using <a href = '%@'>What's On Reading</a> for the iPhone.", content, iTunesLink]; [picker setMessageBody:emailBody isHTML:YES]; picker.navigationBar.barStyle = UIBarStyleBlack; [self presentModalViewController:picker animated:YES]; [picker release]; } Regards Dave

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• Scala 2.8 Actors

  - by Dave

  Hi, We're looking at using actors in our Scala code quite soon. We're also thinking of moving to Scala 2.8 in the next few weeks. We've been keeping an eye on Akka but it doesn't currently support 2.8 and plans for it have slipped from the 0.7 release to 0.8 We would like distributed, supervised actors. Is there an alternative to Akka? Or does anyone know if Akka 0.8 will definitely have 2.8 support (and when it's scheduled for)? Perhaps it's possible to just use Scala actors for the time being and switch to Akka at a later stage? Thanks, Dave

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• PHP SoapClient: Problems with Distributed WSDL File

  - by Dave

  Hello, I have a problem using a distributed WSDL File ( scheme / other definitions are declared outside the actual wsdl) with php's SoapClient. This is the Fault Message I get: SOAP-ERROR: Parsing WSDL: 'getSomeInfo' already defined. After some googling , it seems to be a bug inside php as someone else discovered exactly the same problem: http://bugs.php.net/bug.php?id=45282 Has there been any bug fix(es)? Any solution to work around this bug? PS: I think posting a code snippet is senseless, since the invocation of the SoapClient ctor using just the WSDL is the only that fails. Thank you in advance, Dave

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• using git on android

  - by Dave

  Hi all, I have a desktop application using git for synchronization. I have also an android application which do the same as the desktop, but I don't know how to do the synchronization part on it. I haven't found any implementation of git on android. I found a jgit, but its unwell documented and I was not able to do even a commit with that. I was thinking about remote commands to my git server from my android app, but this is really a tease for me. Could you tell me if any other git implementation which can be used on android exists? If you have any idea how to solve that, please tell me. Thanks for reply, Dave

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• Trouble enabling Grails logging

  - by Dave

  I have this logging configuration in my Config.groovy file. This is a development environment, started as such. I have verified the file exists and there are 775 perms on the file, but nothing is getting output to the file. // set per-environment serverURL stem for creating absolute links environments { production { grails.serverURL = "http://www.changeme.com" } development { grails.serverURL = "http://localhost:8080/${appName}" logFilePath = "/Users/davea/Tomcat/logs/log4j.log" } test { grails.serverURL = "http://localhost:8080/${appName}" } } // log4j configuration log4j = { console name:'Appender1', layout:pattern(conversionPattern: '%-4r [%t] %-5p %c %x - %m%n') rollingFile name:'Appender2', maxFileSize:1024 * 1024, file:logFilePath, layout:pattern(conversionPattern: '%-4r [%t] %-5p %c %x - %m%n') root { debug 'Appender1', 'Appender2' } } Can anyone tell what's wrong with my configuration? Thanks, - Dave

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• What could make GetCursorPos return incorrect coordinates of {0,0} ?

  - by Dave Moore

  We are seeing bad behavior in an application when it runs on Server 2008 (not R2). This is a WinForms application, and Control.MousePosition is returning {0,0} no matter where the mouse is on the screen... Control.MousePosition just makes a P/Invoke call to Win32 api GetCursorPos(). There is a control in our library that calls SetWindowsHookEx to hook WH_CALLWNDPROCRET for our entire process. I'm suspicious of this code, but tracing statements show that we're getting in + out of that hook cleanly. What else should I be looking for? Thanks, Dave

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• Cloud Agnostic Architecture?

  - by Dave

  Hi, I'm doing some architecture work on a new solution which will initially run in Windows Azure. However I'd like the solution (or at least the architecture/design) to be Cloud Agnostic (to whatever extent is realistic). Has anyone done any work on this front or seen any good white papers/blog posts? Our highlevel architecture will consist of a payload being sent to a web service (WCF for instance), this will be dumped on a queue (for arguments sake) and a worker process will grab messages off this queue and proccess them. There will be a database of customer information which we'd ideally like to keep out of the cloud however there are obvious performance considerations. Keen to hear other's thoughts. Cheers Dave

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• No method found compiler warning

  - by Magic Bullet Dave

  I have create a class from a string, check it is valid and then check if it responds to a particular method. If it does then I call the method. It all works fine, except I get an annoying compiler warning: "warning: no '-setCurrentID:' method found". Am I doing something wrong here? Is there anyway to tell the compiler all is ok and stop it reporting a warning? The here is the code: // Create an instance of the class id viewController = [[NSClassFromString(class) alloc] init]; // Check the class supports the methods to set the row and section if ([viewController respondsToSelector:@selector(setCurrentID:)]) { [viewController setCurrentID:itemID]; } // Push the view controller onto the tab bar stack [self.navigationController pushViewController:viewController animated:YES]; [viewController release]; Cheers Dave

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• use jquery autocomplete with carousel for preview and selection

  - by dave

  Hi, I've successfully used jquery autocomplete to display a list of matching images based on user input. The user experience isn't great though due to the number of potential matches - even with fairly prescriptive input. I've found this example at nokia http://www.nokia.co.uk/support/download-software/device-software-update (I know it's written in flash) which would provide the ideal interface for what I'm trying to achieve. Does anyone have any pointers for doing this using jquery autocomplete as a starting point? Or better still know of an existing javascript library that provides this functionality? I'm using the latest release of jquery if that matters. Thanks, Dave.

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• In OpenRasta is it possible to Pattern match multiple key/value pairs?

  - by Scott Littlewood

  Is it possible in OpenRasta to have a Uri pattern that allows for an array of values of the same key to be submitted and mapped to a handler method accepting an array of the query parameters. Example: Return all the contacts named Dave Smith from a collection. HTTP GET /contacts?filterBy=first&filterValue=Dave&filterBy=last&filterValue=Smith With a configuration of: What syntax would be best for the Uri string pattern matching? (Suggestions welcome) ResourceSpace.Has.ResourcesOfType<List<ContactResource>>() .AtUri("/contacts") .And.AtUri("/contacts?filterBy[]={filterBy}[]&filterValue[]={fv}[]") // Option 1 .And.AtUri("/contacts?filterBy={filterBy}[]&fv={fv}[]") // Option 2 Would map to a Handler method of: public object Get(params Filter[] filters) { /* create a Linq Expression based on the filters using dynamic linq query the repository using the Linq */ return Query.All<Contact>().Where(c => c.First == "Dave" && c.Last == "Smith").ToResource() } where Filter is defined by public class Filter { public string FilterBy { get; set; } public string FilterValue { get; set; } }

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• Creating a mask from a graphics context

  - by Magic Bullet Dave

  I want to be able to create a greyscale image with no alpha from a png in the app bundle. This works, and I get an image created: // Create graphics context the size of the overlapping rectangle UIGraphicsBeginImageContext(rectangleOfOverlap.size); CGContextRef ctx = UIGraphicsGetCurrentContext(); // More stuff CGContextDrawImage(ctx, drawRect2, [UIImage imageNamed:@"Image 01.png"].CGImage); // Create the new UIImage from the context UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext(); However the resulting image is 32 bits per pixel and has an alpha channel, so when I use CGCreateImageWithMask it doesn't work. I've tried creating a bitmap context thus: CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray(); CGContextRef ctx =CGBitmapContextCreate(nil, rectangleOfOverlap.size.width, rectangleOfOverlap.size.height, 8, rectangleOfOverlap.size.width , colorSpace, kCGImageAlphaNone); UIGraphicsGetImageFromCurrentImageContext returns zero and the resulting image is not created. Am I doing something dumb here? Any help would be greatly appreciated. Regards Dave

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