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  • How can I track down the cause of ext3 filesystem corruption?

    - by Jon Buys
    We have a VMware vSphere 5 environment running CentOS 5.8 virtual machines. In the past two weeks we have had five incidents of virtual machines having a filesytem become corrupt, requiring an fsck to repair. Here is what we see in the logs: Nov 14 14:39:28 hostname kernel: EXT3-fs error (device dm-2): htree_dirblock_to_tree: bad entry in directory #2392098: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 Nov 14 14:39:28 hostname kernel: Aborting journal on device dm-2. Nov 14 14:39:28 hostname kernel: __journal_remove_journal_head: freeing b_committed_data Nov 14 14:39:28 hostname last message repeated 4 times Nov 14 14:39:28 hostname kernel: ext3_abort called. Nov 14 14:39:28 hostname kernel: EXT3-fs error (device dm-2): ext3_journal_start_sb: Detected aborted journal Nov 14 14:39:28 hostname kernel: Remounting filesystem read-only Nov 14 14:39:28 hostname kernel: EXT3-fs error (device dm-2): htree_dirblock_to_tree: bad entry in directory #2392099: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 Nov 14 14:31:17 hostname ntpd[3041]: synchronized to 194.238.48.2, stratum 2 Nov 14 15:00:40 hostname kernel: EXT3-fs error (device dm-2): htree_dirblock_to_tree: bad entry in directory #2162743: rec_len is smaller than minimal - offset=0, inode=0, rec_len=0, name_len=0 Nov 14 15:13:17 hostname kernel: __journal_remove_journal_head: freeing b_committed_data The problem seems to happen while we are rsync'ing application data from another server. So far we have been unable to reproduce the problem, or identify a root cause. After we had a few servers have this problem, we assumed that there was an issue with the template, so we scrapped all VM's cloned off of the template, destroyed the template, and built a new template from scratch, installed from a newly downloaded CentOS ISO. We use HP EVA SAN's for datastores, and moved from a 4400 to a 6300 after the first problem. Since the move and rebuilding new virtual machines we have seen the issue twice. On one VM we shut down the server, removed two virtual CPUs, and booted it back up again, the problem presented itself almost immediately. On the other VM, we rebooted it, and the problem happened a half hour later. Any tips or pointers in the right direction would be appreciated.

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  • Formatting an external HDD stuck at 70%

    - by mahmood
    My external HDD which is a 250GB WD (powered by USB) seems to have problem! Whenever i try to copy some files, it stuck while copying. I decided to format it. So I used windows tool and performed the format (not quickly) however at nearly 70% it stuck. Then I decided to perform a low level format with lowlevel. Again it stuck at 70%. I endup that the HDD has bad sector. So is there any tool that mark the bad sectors and bypass them? It is not very reasonable to through 250GB because of some bad sectors! P.S: I saw a similar topic but there were no conclusion there either. The smart data is Attribute, raw value, value, threshold, status Read Error Rate, 50, 200, 51, OK Spin-Up Time, 3275, 154, 21, OK Start/Stop Count, 2729, 98, 0, OK Reallocated Sectors Count,0, 200, 140, OK Seek Error Rate, 0, 100, 51, OK Power-On Hours (POH), 1057, 99, 0, OK Spin Retry Count, 0, 100, 51, OK Recalibration Retries ,0, 100, 51 , OK Power Cycle Count, 1385, 99, 0, OK Power-off Retract Count, 425, 200, 0, OK Load /Unload Cycle Count,12974, 196, 0, OK Temperature, 43, 43, 0, OK Reallocation Event Count,0, 200, 0, OK Current Pending Sector Count,23,200, 0, Degradation Uncorrectable Sector Count, 0, 100, 0, OK UltraDMA CRC Error Count,6, 200, 0, OK Write Error Rate/Multi-Zone Error Rate,0,100,51, OK It seems that the most important thing is this line Current Pending Sector Count,23,200, 0, Degradation Any idea on that?

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  • .net thread safety

    - by george9170
    Why is locking a type considered very bad? For example, lock(typeof(DateTime)) I understand that static methods of any class in .net is considered thread safe, and that instance members are not. So it isn't necessary to lock DateTime while you are using it. The book I am reading doesn't explain why it is bad it just says it is. Any explanation will be great.

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  • AutoIt scripts runs without error but I can't see archive? - UPDATE

    - by Scott
    #include <File.au3> #include <Zip.au3> #include <Array.au3> ; bad file extensions Local $extData="ade|adp|app|asa|ashx|asp|bas|bat|cdx|cer|chm|class|cmd|com|cpl|crt|csh|der|exe|fxp|gadget|hlp|hta|htr|htw|ida|idc|idq|ins|isp|its|jse|ksh|lnk|mad|maf|mag|mam|maq|mar|mas|mat|mau|mav|maw|mda|mdb|mde|mdt|mdw|mdz|msc|msh|msh1|msh1xml|msh2|msh2xml|mshxml|msi|msp|mst|ops|pcd|pif|prf|prg|printer|pst|reg|rem|scf|scr|sct|shb|shs|shtm|shtml|soap|stm|url|vb|vbe|vbs|ws|wsc|wsf|wsh" Local $extensions = StringSplit($extData, "|") ; What is the root directory? $rootDirectory = InputBox("Root Directory", "Please enter the root directory...") archiveDir($rootDirectory) Func archiveDir($dir) $goDirs = True $goFiles = True ; Get all the files under the current dir $allOfDir = _FileListToArray($dir) $tmax = UBound($allOfDir) For $t = 0 to $tmax - 1 Next Local $countDirs = 0 Local $countFiles = 0 $imax = UBound($allOfDir) For $i = 0 to $imax - 1 If StringInStr(FileGetAttrib($dir & "\" & $allOfDir[$i]),"D") Then $countDirs = $countDirs + 1 ElseIf StringInStr(($allOfDir[$i]),".") Then $countFiles = $countFiles + 1 EndIf Next If ($countDirs > 0) Then Local $allDirs[$countDirs] $goDirs = True Else $goDirs = False EndIf If ($countFiles > 0) Then Local $allFiles[$countFiles] $goFiles = True Else $goFiles = False EndIf $dirCount = 0 $fileCount = 0 For $i = 0 to $imax - 1 If (StringInStr(FileGetAttrib($dir & "\" & $allOfDir[$i]),"D")) And ($goDirs == True) Then $allDirs[$dirCount] = $allOfDir[$i] $dirCount = $dirCount + 1 ElseIf (StringInStr(($allOfDir[$i]),".")) And ($goFiles == True) Then $allFiles[$fileCount] = $allOfDir[$i] $fileCount = $fileCount + 1 EndIf Next ; Zip them if need be in current spot using 'ext_zip.zip' as file name, loop through each file ext. If ($goFiles == True) Then $fmax = UBound($allFiles) For $f = 0 to $fmax - 1 $currentExt = getExt($allFiles[$f]) $position = _ArraySearch($extensions, $currentExt) If @error Then MsgBox(0, "Not Found", "Not Found") Else $zip = _Zip_Create($dir & "\" & $currentExt & "_zip.zip") _Zip_AddFile($zip, $dir & "\" & $allFiles[$f]) EndIf Next EndIf ; Get all dirs under current DirCopy ; For each dir, recursive call from step 2 If ($goDirs == True) Then $dmax = UBound($allDirs) $rootDirectory = $rootDirectory & "\" For $d = 0 to $dmax - 1 archiveDir($rootDirectory & $allDirs[$d]) Next EndIf EndFunc Func getExt($filename) $pos = StringInStr($filename, ".") $retval = StringTrimLeft($filename, $pos - 1) Return $retval EndFunc Updated, fixed a lot of bugs. Still not working. Like I said I have a list of 'bad' file extensions, this script should go through a directory of files (and subdirectories), and zip up (in separate zip files for each bad extension), all files WITH those bad extensions in the directories it finds them. What is wrong???

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  • Top ten security tips for non-technical users

    - by Justin
    I'm giving a presentation later this week to the staff at the company where I work. The goal of the presentation is to serve as a refresher/remidner of good practices that can help keep our network secure. The audience is made up of both programmers and non-technical staff, so the presentation is geared for non-technical users. I want part of this presentation to be a top list of "tips". The list needs to be short (to encourage memory) and be specific and relevant to the user. I have the following five items so far: Never open an attachment you didn't expect Only download software from a trusted source, like download.com Do not distribute passwords when requested via phone or email Be wary of social engineering Do not store sensitive data on an FTP server Some clarifications: This is for our work network These need to be "best practices" tips for the end-user, not IT policy We have backups, OS patches, firewall, AV, etc, all centrally managed This is for a small business (less than 25 people) I have two questions: Do you suggest any additional items? Do you suggest any changes to existing items?

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  • What's one change in your lifestyle that positively affected your work and health?

    - by pbrodka
    We know that working many hours in front of computers gives us many bad and unhealthy habits, bad health conditions and so on, which in the long term decrease our productivity. Did you make any big changes in your lifestyle that made a big improvement in your health and productivity? Please name one such activity - it could be change of diet, more sports, less coffee, change in your work environment.

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  • the right way to do deployment with capistrano

    - by com
    I look for good practices for deploying with capistrano. I would like to start out with a short description how I used to do deployment. capistrano is installed locally on a developer's computer. I deploy thought gateway with capistrano option :gateway. Firstly, I thought that with :gateway option I need to have ssh connection only to gateway host, but it turns out that I need ssh connection (public key) to all hosts where I want to deploy to. I would like to find a convenient and secure way to deploy application. For example, in case when new developer starts working, is much more convinient to put his *public_key* only on gateway server and not on all applications servers. On the other hand I don't want him to have any connection to servers in particular ssh to gateway, just because he is developer, he needs to do only deployments. If you are aware of good practices for deploying with capistrano, please, let us know.

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  • Is there a way to handle the dynamic change of a dropdown for a single row in a grid-based datawindo

    - by TomatoSandwich
    Is there a way to handle the dynamic change of a dropdown for a single row in a grid-based datawindow? Example: NAME LIKABILITY PURCHASED IN COLOUR (Text) (DropDown*) (Text) (Text) Bananas [Good] Hands Yellow [Bad] [Bananas are good] Apples [Good] Bags Red [Bad] Given the above is a grid-based datawindow, where the fields 'NAME','PURCHASED IN' and 'COLOUR' are text fields, where as the 'LIKABILITY' field is a dropdown*. I say dropdown* because the same visual representation can be created by using a DropDownList (hardcoded within the datawindow element at design time), or a DropDownDW (or DDDW, a select statement that can be based on other elements in the datawindow). However, there is no way I can get 'Bananas' having it's 3 dropdowns, while Apples has only 2. If I enter multiple rows of 'Bananas', then all rows have 3 dropdowns, but as soon as I add an Apples row, all dropdowns revert to 2 selections. To attempt to achieve this functionality, I have tried the following options: -- 1) dw_1.Object.likability.values("Good~tG/Bad~tB/Bananas are good~tDRWHO") on ue_itemchange when editing NAME. FAILS: edits all instances of LIKABILITY instead of the current row. -- 2) Duplicate Dropdowns, having one filtered, one unfiltered selection list per row, visible based on NAME selection. FAILS: can't set visibility/overlapping columns on grid-based datawindow. (Source) -- 3) Hard-code display value as Database value, or Vice Versa. Have 'GOOD','BAD','BANANASAREGOOD' as the display and database values, and change handling of options from G, B, DRWHO to these new values. FAILS: 3rd option appears for all rows, still selectable on Apple rows, which is wrong. -- 4) DDDW retrieve list of options for dropdown. Create a DDDW that uses the value of NAME to determine what selections it should have for the dropdown. FAILS: edits all instances of the dropdown, not just the current row. -- 5) DDDW retrieve counter of options available (if B then 3 else 2), then have duplicate dropdown columns that protect/unprotect based on DDDW counter. FAILS: Can't autoselect dddw value to populate column to cause protect on other two columns, ugly solution in any case. -- There is now a bounty on this question for anyone who can give me a solution that will enable me to edit a dropdown column for a single row on a grid-based datawindow in PB 10.5

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  • c declaring variables in blocks

    - by anon
    I know that in C++, I can declare variables pretty much everywhere. I recall once reading that in C, variables must be declared at the top of a function i.e. the following is invalid: void foo() { int good; if (...) { int bad; } } In the above code, is the declaraing of the bad varaible legal by C standards, or only legal due to a gcc extension? Thanks!

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  • c declaraing varibles in blocks

    - by anon
    I know that in C++, I can declare variables pretty much everywhere. I recall once reading that in C, variables must be declared at the top of a function i.e. the following is invalid: void foo() { int good; if (...) { int bad; } } In the above code, is the declaraing of the bad varaible legal by C standards, or only legal due to a gcc extension? Thanks!

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  • Troubleshooting Facebook's graph.put_object that returns error 400

    - by TimLeung
    I am using Facebook Python's SDK along with Google App Engine, and making a call to do a checkin: graph.put_object("me", "checkins", message="Hello, world", place="165039136840558", coordinates='{"latitude":"38.2454064", "longitude":"-122.0434404"}') However, this throws an error 400 Bad Request and I don't seem to be able to try catch it so I can have the important information. On a bad request, Facebook should return, an object like below which can help troubleshoot and address the issue, but I am not sure how I can retrieve this object: { "error": { "type" : "OAuthException", "message" : "An active access token must be used to query information about the current user." } }

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  • 2D Array values frequency

    - by Morano88
    If I have a 2D array that is arranged as follows : String X[][] = new String [][] {{"127.0.0.9", "60", "75000","UDP", "Good"}, {"127.0.0.8", "75", "75000","TCP", "Bad"}, {"127.0.0.9", "75", "70000","UDP", "Good"}, {"127.0.0.1", "", "70000","UDP", "Good"}, {"127.0.0.1", "75", "75000","TCP", "Bad"} }; I want to know the frequency of each value .. so I27.0.0.9 gets 2. How can I do a general solution for this ? In Java or any algorithm for any language ?

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  • Hacking prevention, forensics, auditing and counter measures.

    - by tmow
    Recently (but it is also a recurrent question) we saw 3 interesting threads about hacking and security: My server's been hacked EMERGENCY. Finding how a hacked server was hacked File permissions question The last one isn't directly related, but it highlights how easy it is to mess up with a web server administration. As there are several things, that can be done, before something bad happens, I'd like to have your suggestions in terms of good practices to limit backside effects of an attack and how to react in the sad case will happen. It's not just a matter of securing the server and the code but also of auditing, logging and counter measures. Do you have any good practices list or do you prefer to rely on software or on experts that continuously analyze your web server(s) (or nothing at all)? If yes, can you share your list and your ideas/opinions?

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  • Security tips for adding wireless AP to domain network?

    - by Cy
    I am researching best-practices for adding wireless to our existing domain network. My DHCP server is running Windows Server 03 Standard (not sure if thats useful). I am familiar with simple home networking but I thought I'd get some expert advice for the more advanced stuff. Any tips and / or best-practices? Is this Cisco Wireless Access Point a good option? Are there any additional hardware recommendations? Thank you in advance for your help.

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  • How can I flush my ssh keys on power management activity?

    - by Sam Halicke
    Hi all, Using ssh-agent and private keys per the usual. Everything's working as normal. My question regards best practices on flushing keys from ssh-add on activity like sleep, suspend, hibernate, etc. I thought about writing a simple wrapper around those commands, but then wondered if are they even called? Or does the kernel initiate this activity directly? Are the PM utilities strictly userland? I would like this additional layer of security beyond locking my screen, etc. and was wondering if anyone else had solved this elegantly or has best practices to recommend. Thanks.

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  • Convert Ruby array of tuples into a hash given an array of keys?

    - by Kit Ho
    I have an simple array array = ["apple", "orange", "lemon"] array2 = [["apple", "good taste", "red"], ["orange", "bad taste", "orange"], ["lemon" , "no taste", "yellow"]] how can i convert in to this hash whenever element in array match the first element of each element in array2? hash = {"apple" => ["apple" ,"good taste", "red"], "orange" => ["orange", "bad taste", "orange"], "lemon" => ["lemon" , "no taste", "yellow"] } I am quite new to ruby, and spend a lot to do this manipulation, but no luck, any help ?

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  • SEO and dynamic javascript HTML switching

    - by Gazow
    just wondering if anyone knows anything of using javascript to set html to new content instead of linking to new pages, if this is generally a bad idea or if it kind of hurts SEO(which im kind of new to) Basically the home page displays given content, and the links to like contact pages and stuff, just change the body content to what would normally be a separate html page. my OCD kinda bugs me when pages reload and either flash the background or its offset somehow, so i wanted to know if making sites like this was a bad idea or whatever- i suppose at the least, i could create duplicates/hidden pages for SEO purposes

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  • symbols in command line argument.. python, bash

    - by Idlecool
    Hi, I am writing a python script on Linux for twitter post using API, Is it possible to pass symbols like "(" ")" etc in clear text without apostrophes.... % ./twitterupdate this is me #works fine % ./twitterupdate this is bad :(( #this leaves a error on bash. Is the only alternative is to enclose the text into -- "" ?? like.. % ./twitterupdate "this is bad :((" #this will reduce the ease of use for the script Is there any workaround?

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  • Add a file in a folder with bash

    - by CuriousGeorge
    I have figured out how to remove bad files in my folders but I am wanting to know how to add certain named files to that folder. I want to add something like address.xml I have this and can remove the bad files. for addxml in $(find $DIRECTORY/$directoryname -name address.xml); do rm -v $addxml done I am trying to learn how later down the code I can add a file from another folder no where near the folders that are being edited.

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  • Regex issue in rewriter config

    - by sgbinks
    I'm having an issue with bad requests from certain search parameters. An example URL: http://www.foo.com/washington/forums/search/%26 Results in a bad request. The rewriter config line looks like this: <rewrite url="^(.*)/forums/search/(.*)" to="~/Pages/Forums/Overview.aspx?Address=$1&amp;q=$2" processing="stop" /> I'm thinking it's an issue with the Regex...? Thanks in advance!

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