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• Database checksum features - redundant? useful?

  - by Eloff

  Just about every mainstream DB has a feature to calculate checksums per page, per sector, or per record. Now for a DB that does full recover after any crash, like PostgreSQL, is a checksum even useful? There will be no data loss as long as the xlog is ok, no matter what kind of corruption happened to the data itself, as the redo log is replayed every committed transaction will be restored. So checksums are useless on restore. Doesn't the filesystem or disk keep checksums anyway to detect corruption? So unless the checksum is per record, all it does is tell you there is corruption - which the OS should be yelling at you the minute you try to read it - so useless in operation? I can't imagine how a checksum can be helpful in any sane database - but since they all use them - I'd say that's just failure of imagination on my part. So how is it useful?

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• Backup VSS Issues

  - by MJ

  I've got this server, and we've been having VSS issues for quite awhile. We've tried every form of re-registering the VSS drivers we can think of. NTbackup won't run a system state backup vssadmin list writers doesn't list anything. We're getting VSS error 12302 in the event log. Has anyone ran into a situation like this before? We're thinking the next step, if possible, is a complete reinstall of the VSS. Any other ideas?

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• Can I recover a nano process from a previous terminal?

  - by davidparks21

  My system crashed while I was in a nano session with unsaved changes. When I log back in via SSH I see the nano process still running when I do a ps. davidparks21@devdb1:/opt/frugg_batch$ ps -ef | grep nano 1001 31714 29481 0 18:32 pts/0 00:00:00 nano frugg_batch_processing 1001 31905 31759 0 19:16 pts/1 00:00:00 grep --color=auto nano davidparks21@devdb1:/opt/frugg_batch$ Is there a way I can bring the nano process back under my control in the new terminal? Or any way to force it to save remotely (from my new terminal)?

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• Use linefeed or carriage return in Subversion commit message from the command line

  - by Scott

  I am using Subversion 1.6.6 on Ubuntu 10.04. I would like to insert a carriage return, or linefeed, or newline into my commit message so that when reading the log, the comments are formatted appropriately. It works fine when I use the system editor, or specify a file for the commit comment, but what I really want is to be able to do something like the following: svn ci -m "This is the first line\nThis is the second line" and have the comment presented as: This is the first line This is the second line My example does not work, it produces output: This is the first line\nThis is the second line So, is there a way to do this? If so, how?

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• FreeNX Server w/ nxagent 3.5 not able to create shadow sessions

  - by Jenna Whitehouse

  I am running a FreeNX server on Ubuntu 11.10 and am unable to do session shadowing. I get the authorization prompt, but the shadow client crashes after. The NX server log in the user's .nx directory is as follows: Error: Aborting session with 'Server is already active for display 3000 If this server is no longer running, remove /tmp/.X3000-lock and start again'. Session: Aborting session at 'Mon Oct 1 14:26:44 2012'. Session: Session aborted at 'Mon Oct 1 14:26:44 2012'. This then deletes the lock file, which is the lock file for the initial Unix session and crashes out. Everything works for a normal session, and shadowing works up to the authorization prompt. I am using this software: Ubuntu 11.10 freenx-server 0.7.3.zgit.120322.977c28d-0~ppa11 nx-common 0.7.3.zgit.120322.977c28d-0~ppa11 nxagent 1:3.5.0-1-2-0ubuntu1ppa8 nxlibs 1:3.5.0-1-2-0ubuntu1ppa8 Any help is appreciated, thanks!

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• Prevent IIS7 HTTPS from binding to all SSL IP addresses

  - by robpaveza

  I've had this interesting problem with IIS7. I have a number of HTTPS sites in IIS7. That hasn't been a problem, until I wanted to go and set up VisualSVN Server using an SSL certificate. The installer had trouble starting the service. When I looked in the event log, the error was that "the file is already in use by another process." I figured that the "file" was really a socket, and checked with netstat - even though IIS was only bound to three specific IP addresses (.160, .156, and .168) with port 443, it was consuming *:443. I could stop the World Wide Web Publishing Service, start VisualSVN, and then start IIS, but then none of my SSL servers would start. Any helpful hints about how I could make IIS not try to default-bind to *:443? Thanks!!

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• Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)

  - by snitko

  I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx. Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too. Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output: $ iostat avg-cpu: %user %nice %system %iowait %steal %idle 0.17 0.00 0.02 0.57 0.16 99.07 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvda 2.25 39.50 16.08 147042 59856 xvdb 0.00 0.05 0.00 192 0 xvdc 2.20 25.93 24.93 96530 92808 xvdd 0.01 0.12 0.00 434 16 xvde 0.04 0.23 0.35 858 1304 xvdf 0.37 0.31 4.12 1162 15352 Rebooting didn't help either. Any ideas where should I be looking?

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• What software can I use to pinpoint why Windows Server 2003 takes 15 seconds for any operation?

  - by Dr. Zim

  Ram is about 1/2 in use, four CPUs are all but idle. I tried "Microsoft Server Performance Advisor" with no luck. No entries in the Event Log for hardware failures, etc. And yet I can click on the start menu and wait 15 seconds for any new attempt. Launching software takes 30 seconds to respond. The server has an 8 drive WD RE 250 gig each Dell Perc 6 Sata raid array with Intel gigabit network cards. Anyone have any software titles that could analyze what is going wrong with this server?

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• "error 1723 there is a pr*blem with this windows installer package a dll required for this install to complete could not be run" while uninstall java

  - by user1650410

  I am having the following problem:I've installed java 1.6u33 on my windows 7 machine.Everything was fine, i was running eclipse for example.But i did a mistake -i deleted the jre6 dir.Now i am trying to reinstall java with no success.I got this msg when i try to uninstall it: "error 1723 there is a problem with this windows installer package a dll required for this install to complete could not be run..."I've deleted everything i had found for java in the registry,the Java dir, also tried JavaRa.I saw in MSI**.LOG files what dll is mising and put it where it was searched for.No success. So is there a way i can reinstall java without reinstalling windows?

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• Is this possible?

  - by PythonNewbie2

  Hello, I'm exploring some technologies and JSP with JSF 2.0 and Primefaces seems really cool. I'm new to all of these, but I'm a fast learner. I wondering if I can create the web app I want withh JSP/JSF/Primefaces or should I be looking to different technologies? If I should, which ones do you recommend? Here's a basic description of the app: Users log in with their username and password (maybe I can somehow incorporate google OPENID)? With a really nice UI, they will be presented a large list of questions specific to a certain category, for example, JSP. When they click on any of these questions, a little input opens up below it to allow the user to put in a link. If the link they enter has the same question on that webpage the URL points to, they will be awarded one point. This question then disappears and gets added to a different page that has a list of all correctly linked questions. On the right side of the screen, there will be a leaderboard with the usernames of the people with the top ten points. Is this possible with JSP/JSF/Primefaces, or should I be looking elsewhere for a different web technology? The idea is relatively simple - to be able to compile links to external websites for specific questions. I know I can build the UI easily with Primefaces. What I'm not sure is if JSP/JSF gives the ability to parse HTML at a certain URL to see if it contains words. I can do this with python easily by using urllib. Any help would be appreciated!!! What would be more helpful than a "Yes" or "No" answer would be links to where I can see sample code of external HTML parsing. Your input is truly appreciated! Thanks!

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• How important is graceful degradation of JavaScript? [closed]

  - by Stephen

  Should web developers continue to spend effort progressively enhancing our web applications with JavaScript, ensuring that features gracefully degrade, thereby ensuring accessibility? Or should we spend that time focused on new features or other areas of development? The subtext of that question would be: How many of our customers/clients/users utilize our websites or applications with JavaScript disabled? Do you have any projects with requirements that specifically demand JavaScript functionality (almost all of mine do), and do those requirements also demand graceful degradation? For the sake of asking this question, I pulled up programmers.stackexchange.com without JavaScript enabled, and I was greeted with this message: "Programmers - Stack Exchange works best with JavaScript enabled". It was difficult to log in, albeit the site seemed to generally work okay. (I wasn't able to vote up any questions.) I think this is a satisfactory approach to development. Imagine the effort involved in making all of the site's features work with plain old HTML and server-side logic. On the other hand, I wonder how many users have been alienated by this approach. We've all been trained (at least the good developers among us) to use progressive enhancement and to ensure our web applications' dynamic features degrade gracefully. Is this progressive enhancement just pissing into the wind, or do some of our customers actually utilize certain web services without JavaScript enabled?

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• Linux Software RAID: How to fsck on hard drive?

  - by Rick-Rainer Ludwig

  We have a Linux server running with Software RAID1. We see some issues in /var/log/messages like: unreadable sector. I want to perform a complete fsck on the drive to get some more information, but a fsck /dev/md0 brings a clean due to the Software RAID layer in between. How can I check the real hard drive? Do I need to disassemble the whole RAID? How do I deal with the inconsistency in the partition due to the additional Software RAID header? Does anyone have a good idea for this?

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• Load login shell inside user cronjob

  - by sa125

  I'm trying to run a rake task using a scheduled cronjob. My crontab looks something like this: 0 1 * * 1-7 /bin/bash -l -c "cd ~/jobs/rake && rake reports:create >> ~/jobs/logs/cron.log" Ruby on my account is provided by RVM, which is loaded via ~/.bashrc (before the no-interaction check): # load RVM env [[ -s $HOME/.rvm/scripts/rvm ]] && source $HOME/.rvm/scripts/rvm # If not running interactively, don't do anything [ -z "$PS1" ] && return # ... rest of logic Time and again, this task fails to run since RVM isn't loaded when the task is called (uses system's /usr/bin/ruby instead), and gem dependencies are missing. How can I make crontab load my shell environment before executing my scheduled jobs? thanks.

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• mapping server 2008 network drive to vista home premium x64

  - by rboorgapally

  Hi, We have a windows server 2008 box at my work place. I want to map a drive from the server to my laptop. I use windows vista home premium x64. I am connected to my workplace through VPN. i can map the drive when I use the administrator account on the server. But the log on is unsuccessful if I use my personal account on the server to map the drive. My personal account on the server is part of Administrators group. Can any one help me with this?

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• libgdx intersection problem between rectangle and circle

  - by Chris

  My collision detection in libgdx is somehow buggy. player.png is 20*80px and ball.png 25*25px. Code: @Override public void create() { // ... batch = new SpriteBatch(); playerTex = new Texture(Gdx.files.internal("data/player.png")); ballTex = new Texture(Gdx.files.internal("data/ball.png")); player = new Rectangle(); player.width = 20; player.height = 80; player.x = Gdx.graphics.getWidth() - player.width - 10; player.y = 300; ball = new Circle(); ball.x = Gdx.graphics.getWidth() / 2; ball.y = Gdx.graphics.getHeight() / 2; ball.radius = ballTex.getWidth() / 2; } @Override public void render() { Gdx.gl.glClearColor(1, 1, 1, 1); Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT); camera.update(); // draw player, ball batch.setProjectionMatrix(camera.combined); batch.begin(); batch.draw(ballTex, ball.x, ball.y); batch.draw(playerTex, player.x, player.y); batch.end(); // update player position if(Gdx.input.isKeyPressed(Keys.DOWN)) player.y -= 250 * Gdx.graphics.getDeltaTime(); if(Gdx.input.isKeyPressed(Keys.UP)) player.y += 250 * Gdx.graphics.getDeltaTime(); if(Gdx.input.isKeyPressed(Keys.LEFT)) player.x -= 250 * Gdx.graphics.getDeltaTime(); if(Gdx.input.isKeyPressed(Keys.RIGHT)) player.x += 250 * Gdx.graphics.getDeltaTime(); // don't let the player leave the field if(player.y < 0) player.y = 0; if(player.y > 600 - 80) player.y = 600 - 80; // check collision if (Intersector.overlaps(ball, player)) Gdx.app.log("overlaps", "yes"); }

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• Wammu - USB Device Name?

  - by Paul

  I'm trying to get to my phone's filesystem through USB in Wammu, but I'm stuck in the configuration wizard when it asks for a USB device name. After about an hour of Internet searching, here are the failed solutions I've already tried, starting with the relevant information returned by lsusb in terminal. lsusb Bus 001 Device 003: ID 12d1:101e Huawei Technologies Co., Ltd. So I tried opening Wammu through sudo wammu in terminal and inputting "/dev/bus/usb/001/003" as the device name, which returns: Error opening device Device /dev/bus/usb/001/003 does not exist! and then "/dev/bus/usb/001/", which returns: Failed to connect to phone Description: Error opening device. Unknown, busy, or no permissions.<br> Function: Init<br> Error code: 2 Another proposed solution was to try "tail -f /var/log/messages" in terminal. But that only returned a "No such file or directory" message. Seemingly relevant dmesg info: [ 4739.716214] usb 1-1: new high-speed USB device number 8 using ehci_hcd [ 4739.854137] scsi9 : usb-storage 1-1:1.0 [ 4740.854416] scsi 9:0:0:0: CD-ROM HUAWEI T Mass Storage 2.31 PQ: 0 ANSI: 2 [ 4740.867051] sr0: scsi-1 drive [ 4740.867806] sr 9:0:0:0: Attached scsi CD-ROM sr0 [ 4740.870464] sr 9:0:0:0: Attached scsi generic sg1 type 5 I don't know why it is coming up as CD-ROM. But there it is. If you haven't noticed already, I'm an absolute beginner when it comes to Linux and terminal. So speaking to me like I'm a three year old is welcome if you can propose a solution. I'm running Ubuntu 12.04 LTS, and the phone is a Huawei U1250. My computer is an Acer Aspire One D250/KAV60. Any help is much appreciated.

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• can Snort be installed on VPS?

  - by jack

  Hi Linux Admins I want the maximum security for my linux vps. I found many tutorials round the net but it doesn't cover the Snort. Only those like portentry, logsentry, tripwire and so on. So I'm beginning to think that Snort is not appropriate for a linux host. I think it's suitable only as a proxy/middle-man that checks traffic before passing to acutual targets. I'd like to whether Snort can be installed on VPS which serves typical servers like web/mail. Can Snort be in complict with OSSEC which I think it doesn't check the traffic but the log files only for Intrusion Detection/Anomaly? Thank you.

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• CentOS PAM+LDAP login and host attribute

  - by pianisteg

  My system is CentOS 6.3, openldap is configured well, PAM authorization works fine. But after turning pam_check_host_attr to yes, all LDAP-auths fail with message "Access denied for this host". hostname on the server returns correct value, the same value is listed in user's profile. "pam_check_host_attr no" works fine and allows everyone with correct uid/password a piece of /var/log/secure: Sep 26 05:33:01 ldap sshd[1588]: pam_unix(sshd:auth): authentication failure; logname= uid=0 euid=0 tty=ssh ruser= rhost=my-host user=my-username Sep 26 05:33:01 ldap sshd[1588]: Failed password for my-username from 77.AA.BB.CC port 58528 ssh2 Sep 26 05:33:01 ldap sshd[1589]: fatal: Access denied for user my-username by PAM account configuration Another two servers (CentOS 5.7 Debian) authorizes on this LDAP server correctly. Even with pam_check_host_attr yes! I didn't edit /etc/security/access.conf, it is empty, only default comments. I don't know what to do! How to fix this?

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• WICD Network Manager does'nt work in 13.10

  - by Jayakumar J

  I am currently making use of a Wired Broadband, where in the default Network Manager though shows that the Auto Ethernet is connected, I was unable to browse through any websites in the browser. I had to disconnect & connect the Auto Ethernet several times in the Network Manager or restart Ubuntu to get it fixed. But following these steps is quiet annoying as this issue happens very frequently. I browsed through the internet and got to know that WICD Network Manager fixes this issue. Earlier I have been using Ubuntu 12.04 where the same issue was fixed by making use of WCID Network Manager. Recently I upgraded to 13.10 and as I got the same network issue in default Network Manager, I have installed WICD Network Manager but when I try to open WCID, I get an alert message saying, "Could not connect to wicd's D-Bus interface. Check the wicd log for error messages." When I click on OK, I get the same message again and when I click on OK again I get the following message, "Error connecting to wicd service via D-Bus.Please ensure the wicd service is running." Any help to fix this issue is greatly appreciated as this issue was annoying me since I installed 13.10

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• Server error 500 when adding .htaccess file in the root folder

  - by welou

  I read a lot of server error 500 questions related to the famous .htaccess file but I have still not found an answer to this error. I have a folder which I used to test the .htaccess file. =>http://localhost/xampp/example/ I copied the .htaccess in the example folder and I get server error 500 my .htaccess file contains this: <IfModule mod_expires.c> ExpiresActive on ExpiresByType image/png "access plus 1 days" </IfModule> I have changed my httpd.conf file: all AllowOverrride None to AllowOverride All i have also uncommented this line: LoadModule expires_module modules/mod_expires.so error.log says: ExpiresActive not allowed here I still get the error 500 What is actually happening? How can I resolve this error? PS: i am running on localhost with XAMPP

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• how to change document root to public_html from root directory

  - by manish

  For testing I hosted my website on free server from 000webhost.com They have a directory structure:- (root folder) \ (public folder) \public_html this directory structure enables to keep all the library files in root folder and all public data in \public_html, so I developed my website accordingly, and my final structure looked like:- / /include(this folder contains library files) /logs(log files) /public_html /public_html/index.php /public_html/home.php /public_html/and other public files on 000webhost makes only public_folder available to be accessed via url and my url looked neat and clean like www.xample.com/index.php or www.example.com/home.php but after completion of development I moved website to shared host purchased from go-daddy.com, now they do not have any such kind of directory permission, all the files are kept in root folder and are accessible via url also url has become like:- www.example.com/public_html/home.php or www.example.com/public_html/index.php How should I redirect url request to public_html folder again so as to make library file unavailable to public access and make url neat and clean.

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• Can't send emails through sendmail, error occured

  - by skomak

  Hi, I have sendmail MTA and i use pear:Mail class to send mails through remote sendmail server. Everything was fine till yesterday. Probably nothing changes was made in configs. At maillog i can see: May 6 12:58:55 xxx sendmail[25903]: STARTTLS=server, relay=hostxxxx.static.xx.xx.pl [85.x.x.x], version=TLSv1/SSLv3, verify=NO, cipher=DHE-RSA-AES256-SHA, bits=256/256 May 6 12:58:56 xxx sendmail[25903]: o46AwtqE025903: hostxxxx.static.xx.xx.pl [85.x.x.x] did not issue MAIL/EXPN/VRFY/ETRN during connection to MTA2 and in /var/log/messages: May 6 13:00:17 lilia sendmail[27193]: realm changed: authentication aborted I use ldap to authenticate users but i used the same script to check mailing on another server and it works there good, only this server behave weird. Packets are deliverd to sendmail server i can see it in tcpdump, but there is smaller packets than on other server which sends emails. Could you tell me how can i check what is wrong with that? D.S.

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• Unable to create system partition or locate existing system partition during Windows-7 installation

  - by glenneroo

  I have Windows XP 32-bit installed on an ASUS A8N-SLI Deluxe with 2x 500gb drives in RAID1 using the NV RAID controller. On this there are 3 partitions (XP, XP backup and DATA) There are also 4x 500gb drives in RAID10 using the Silicon Image 3114R RAID controller. I just purchased a Windows 7 64-bit as an ISO download upgrade version which I promptly burned to DVD and attempted to perform an upgrade installation. Here is the error message I am getting: Firstly, where are these "Setup log files" located? Second, does this mean I need to find compatible (64-bit?) drivers for the Mainboard and put them on floppy? EDIT: As suggested on another forum, I tried downloading the nVidia Mainboard RAID drivers for Windows 2003 64-bit. I loaded the drivers successfully using the Load Driver button, but pressing NEXT still returns this error.

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• Strategy to allow emergency access to colocation crew

  - by itsadok

  I'm setting up a server at a new colocation center half way around the world. They installed the OS for me and sent me the root password, so there's obviously a great amount of trust in them. However, I'm pretty sure I don't want them to have my root password on a regular basis. And anyway, I intend to only allow key-based login. On some cases, though, it might be useful to let their technical support log in through a physical terminal. For example, if I somehow mess up the firewall settings. Should I even bother worrying about that? Should I set up a sudoer account with a one-time password that will change if I ever use it? Is there a common strategy for handling something like this?

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• Does SELinux make Redhat more secure?

  - by vfclists

  Does SELinux make Redhat more secure? I can't remember the number of times when I have disabled SELinux because it kept frustrating my ability to get stuff running. Lots of times to there was no obvious reason why stuff wasn't working and I had to Google to discover why. Given that most casual users will disable or weaken security when it appears to get in the way, with the exclusion of serious, enterprisey Redhat users, is SELinux really useful? PS. Is there some tool that helps you log, track and manage SELinux issues across all applications? In spite of being an Ubuntu user I am a closet Fedora fan.

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