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Articles indexed Sunday March 20 2011

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• wireshark not seeing all packets on WiFi

  - by Caffeine Coma

  I'm using Wireshark on OSX, trying to sniff my home network over WiFi. While I can see packets that are sent to/from the host I'm sniffing on, I'm not seeing anything else that goes over the WiFi. It's like I'm not in promiscuous mode or something (the promiscuous mode box is in fact checked). The router is an Apple Airport Extreme, protected by WPA2. I'm attached to the network I'm trying to sniff, so I'm confused about why I can't see other traffic. Edit: I solved this by the following: Plug Macbook directly into the Airport Extreme router Enable "internet sharing" on Macbook, with no password. Bind wireless device (the one I wanted to sniff) to the WiFi hotspot generated by Internet sharing in step 2. Run Wireshark on the Macbook, bound to device en1. Don't forget to disable sharing after you're done. :-)

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• How to access remotly to a mysql server?

  - by ÉricP

  Hi, I'm trying to access my remote mysql server from my own computer. I uncommented: bind-address = 80.10.65.45 I added 80.10.65.45 as a server in privilege root 80.10.65.45 yes ALL PRIVILEGES yes I'm using Sequel Pro on MacosX to connect via SSH here is the debug log: debug1: Authentication succeeded (password). debug1: Local connections to LOCALHOST:58517 forwarded to remote address 127.0.0.1:3306 debug1: Local forwarding listening on ::1 port 58517. debug1: channel 0: new [port listener] debug1: Local forwarding listening on 127.0.0.1 port 58517. debug1: channel 1: new [port listener] debug1: Entering interactive session. debug1: Connection to port 58517 forwarding to 127.0.0.1 port 3306 requested. debug1: channel 2: new [direct-tcpip] channel 2: open failed: connect failed: Connection refused debug1: channel 2: free: direct-tcpip: listening port 58517 for 127.0.0.1 port 3306, connect from 127.0.0.1 port 58519, nchannels 3

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• mkfs Operation Takes Very Long on Linux Software Raid 5

  - by Elmar Weber

  I've set-up a Linux software raid level 5 consisting of 4 * 2 TB disks. The disk array was created with a 64k stripe size and no other configuration parameters. After the initial rebuild I tried to create a filesystem and this step takes very long (about half an hour or more). I tried to create an xfs and ext3 filesystem, both took a long time, with mkfs.ext3 I observed the following behaviour, which might be helpful: writing inode tables runs fast until it reaches 1053 (~ 1 second), then it writes about 50, waits for two seconds, then the next 50 are written (according to the console display) when I try to cancel the operation with Control+C it hangs for half a minute before it is really canceled The performance of the disks individually is very good, I've run bonnie++ on each one separately with write / read values of around 95 / 110MB/s. Even when I run bonnie++ on every drive in parallel the values are only reduced by about 10 MB. So I'm excluding hardware / I/O scheduling in general as a problem source. I tried different configuration parameters for stripe_cache_size and readahead size without success, but I don't think they are that relevant for the file system creation operation. The server details: Linux server 2.6.35-27-generic #48-Ubuntu SMP x86_64 GNU/Linux mdadm - v2.6.7.1 Does anyone has a suggestion on how to further debug this?

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• Configure Apache to use external proxy for internet connection

  - by warpech

  In my application I am using following rewrite rule: RewriteRule ^/ajax(.*) http://api.externalserver.com/$1 [P,QSA,L] You know what it does. Now the problem is that my corporate network requires me to use HTTP proxy for external internet connections. To ilustrate, this doesn't work: curl -v http://api.externalserver.com/login But this works: curl -v -x 11.22.11.22:8585 http://api.externalserver.com/login How can I make Apache use the corporate proxy for external internet requests?

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• Fastest web server for serving static content

  - by Swader

  Hello, I'm optimizing our system for some faster static content delivery, and was wondering if anyone has any proper experience with the fastest web servers out there for such a purpose. From the three main candidates I've considered, Nginx, Cherokee and Lighttpd, each seems to have its own problems - but the reports I've read online are somewhat biased and lean towards whichever server the user is currently using. Any ideas on where to see a proper benchmark for this specific purpose, or at least a non-biased list of pros and cons? Any personal experiences and pitfalls I should be vary of? Thanks Edit: Serverfault.com gave the answer as nginx. I'd still like to hear some developer thoughts from this end of the universe.

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• Install problems with XSendFile on Ubuntu

  - by Dan

  I installed the apache dev headers: sudo apt-get install apache2-prefork-dev Downloaded and compiled the module as outlined here: http://tn123.ath.cx/mod_xsendfile/ Added the following line to /etc/apache2/mods-available/xsendfile.load: LoadModule xsendfile_module /usr/lib/apache2/modules/mod_xsendfile.so Added this to my VirtualHost: <VirtualHost *:80> XSendFile on XSendFilePath /path/to/protected/files/ Enabled the module by doing: sudo a2enmod xsendfile Then I restarted Apache. Then this code still just provides me with an empty file with 0 bytes: file_path = '/path/to/protected/files/some_file.zip' file_name = 'some_file.zip' response = HttpResponse('', mimetype='application/zip') response['Content-Disposition'] = 'attachment; filename=%s' % smart_str(file_name) response['X-Sendfile'] = smart_str(file_path) return response And there is not in the Apache error log that pertains to XSendFile. What am I doing wrong?

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• ProFTPD / PAM issues with new centos/virtualmin install

  - by iamthewit

  Hi All, I just installed CentOS 5.4 on a rackspace cloud server and installed virtualmin which all seemed to go fine. The only problem I have is that I can not access the virtual servers directories via FTP. I get the following from filezilla: Status: Connecting to 1.1.1.1:21... Status: Connection established, waiting for welcome message... Response: 220 FTP Server ready. Command: USER username Response: 331 Password required for username. Command: PASS ******* Response: 230 User username logged in. Status: Connected Status: Retrieving directory listing... Command: PWD Response: 257 "/" is current directory. Command: TYPE I Response: 200 Type set to I Command: PASV Response: 227 Entering Passive Mode (1,1,1,1,216,214) Command: LIST Error: Connection timed out Error: Failed to retrieve directory listing and I get this from my /var/secure/log file Sep 22 19:40:42 stickeeserver proftpd: pam_unix(proftpd:session): session opened for user username by (uid=0) Sep 22 19:40:42 server proftpd[14051]: 94.136.40.82 (::ffff:217.207.31.60[::ffff:217.207.31.60]) - USER nastypasty: Login successful. Sep 22 19:40:42 server proftpd[14051]: 94.136.40.82 (::ffff:217.207.31.60[::ffff:217.207.31.60]) - Preparing to chroot to directory '/home/username' Sep 22 19:40:42 server proftpd[14051]: 94.136.40.82 (::ffff:217.207.31.60[::ffff:217.207.31.60]) - mod_delay/0.5: delaying for 728 usecs Sep 22 19:40:42 server proftpd[14051]: 94.136.40.82 (::ffff:217.207.31.60[::ffff:217.207.31.60]) - error setting IPV6_V6ONLY: Protocol not available Any help would be greatly appreciated, I'm not totally new to Linux but it's not my strongest subject. I do like to know exactly why problems occur though and how exactly to fix them so the more detail the better! cheers

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• Amazon EC2 - Reserved Private Addresses

  - by reach4thelasers

  I've got a private DNS Server running on Amazon EC2. I don't need a public IP Address because its only used for private addressing web1.xxx.internal database1.xxx.internal Problem is I had to terminate the instance recently and start a new one. This meant that the private IP address of the DNS server changed and I had to log in to each of my other 15 server one-by-one and change the DNS address to point to the new DNS server. There must be a better way to do this, if so, what is it?

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• Techniques to Monitor cron tasks?

  - by Tristan Juricek

  Are there good techniques for monitoring cron tasks over a cluster? We're starting to use cron to launch tasks at daily intervals. A few ideas for checking out information: Add special application handling that logs information into some "network aware" place, like a DB Build up a logfile system that transfers the cron log periodically to a central point for processing/querying (along with other possible log files) I'm wondering if people have had success with doing things separately for cron versus other things, or, if the tasks were integrated into a different approach completely. I'm leaning towards #2, but I'd like to know what more experienced folk might try out.

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• nginx virtual hosts are not working, all vhosts goes to the default one

  - by Adirael

  Hello, I just did a clean install of nginx + php-fpm on a VPS running Ubuntu 10.10, nginx is serving and PHP is working fine, but I'm not able to add vhosts to it. Well, I can add them, but only one works, the rest go to this first one. This is my first vhost, for host1: server { listen 80; server_name host1; access_log /var/log/nginx/host1.log; error_log /var/log/nginx/host1.error.log; location / { root /var/www/vhosts/host1/; index index.html index.htm index.php; } location ~ \.php$ { include /etc/nginx/fastcgi_params; #fastcgi_pass 127.0.0.1:9000; fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_param SCRIPT_FILENAME /var/www/vhosts/host1/$fastcgi_script_name; fastcgi_param PATH_INFO $fastcgi_script_name; fastcgi_index index.php; } } And the second one, for host2: server { listen 80; server_name host2; access_log /var/log/nginx/host2.log; error_log /var/log/nginx/host2.error.log; location / { root /var/www/vhosts/host2/; index index.html index.htm index.php; } location ~ \.php$ { include /etc/nginx/fastcgi_params; #fastcgi_pass 127.0.0.1:9000; fastcgi_pass unix:/var/run/php5-fpm.sock; fastcgi_param SCRIPT_FILENAME /var/www/vhosts/host2/$fastcgi_script_name; fastcgi_param PATH_INFO $fastcgi_script_name; fastcgi_index index.php; } } The problem is, when I go to http://host1 everything is fine, but on http://host2, it just shows host1! I don't have Apache installed and everything comes from repos. Any pointers?

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• How do I restrict the Open/Save dialog in Windows to one folder?

  - by MindModel

  I spend a significant amount of time helping non-techies use their PC's. I realized most of that time is spent trying to explain to them how the Windows folder hierarchy works, where the "open file" dialog is pointing now, and how to find that Word document they saved. All this time, they're telling me they "just want to print the file". They refuse to learn how to read the PC screen, try to memorize a fixed set of steps, and end up calling me back to tell me their files disappeared again. I realize it's not productive to try to restrict where PC apps (e.g. Quicken) store files. But if there was a Windows utility I could turn on or off that would restrict the Open/Save dialogs in Windows apps, my noob user friends and I would save an enormous amount of time. The goal would be to have all files whose locations are chosen by the Save dialog saved to one folder, and have the Open dialog always point to that folder, until the utility is turned off. Does such a Windows utility exist?

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• IP6 seems to be enabled - How do I configure it without interfering with IP4?

  - by Mister IT Guru

  I noticed that some of my Centos boxes have IP6 enabled, and seem to have addresses. I have no problem with this, but I would like to get a handle on it, and even connect to them using IP6. This would really help if for any reason DHCP has a hiccup. But I'm a bit lost as to where the configuration on my CentOS box is. (I am also on google researching this, but I like server fault! :) ) I am hoping that I would be able to log into this via the VPN because every now and then that DHCP device has a bad morning, and needs to be restarted. (I'm also looking into this issue, but someone else handles that, management separation gone mad!) It's a remote client, so it would be a lot easier for me to connect to these systems which seem to self configure, to use that as a pivot via ssh tunnels to get to other remote devices to continue to manage them, while out main route is fixed. I guess, my questions are How can I configure IP6 without interfering with IP4, and On CentOS, can I influence this auto configuration I seem to be seeing?

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• SQL 2008 R2 3rd Party Peer-to-Peer Replication, Global Site Distribution

  - by gombala

  We are looking at hosting 3 globally distributed SQL Server installations at different data centers. The intent is that Site A will serve web traffic and data for a specific region, same with Site B and C. In the case that Site A data center goes down, looses connectivity, etc. the users of Site A users will fail over to Site B or C (depending which is up). Also, if a user from Site A travels to Site C they should be able to access their data as it was on Site A. My questions is what SQL replication technology (SQL Replication or 3rd party) can support this scenario? We are using SQL 2008 R2 Enterprise at each site, each site runs on top of VMWare with a Netapp filer. Would something like distributed caching help in this scenario as well? We have looked at and tested Peer-to-Peer replication but have encountered issues with conflicts during our testing. I imagine there are other global data centers that have encountered and solved this issue.

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• Preventing Thunderbird to add .txt to attachments on open.

  - by Horcrux7

  How can I prevent Thunderbird to add the extension .txt to a file when open the attachment. I have the problem with .patch files which I want look with notepad++. The problem is that notepad++ does not detect the right formating for the file because the extension is .txt. If I drag the file on the desktop an double click all is working. Why change Thunderbird the file name on opening? I am working on Windows 7.

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• Can't sync iphone when sync podcasts selected

  - by spacecadet

  I've gone through the following steps: Loaded up iTunes 10 on a Windows7 machine Went to iTunes store and subscribed to a podcast Selected sync podcasts Clicked sync However, it always hangs on step 1 of 3 - it just gives a status of 'Backing up' and never progresses past that. I've waited over an hour 3 times now. I'm getting so infuriated with this iTunes software; I'm afraid I might damage my PC in frustration ;-) Any help greatly appreciated. Thank you.

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• How do you hide Windows 7 Explorer Toolbar and Property Bar?

  - by xpda

  In Windows 7, Windows Explorer has a large bar just above the status bar that contains properties of the highlighted item. Is it possible to hide this? It takes up a significant amount of screen space I'd prefer using in the file listing. Also, is it possible to hide the tool bar for the same reason? That's what I'm calling the bar near the top with "Organize, Open, Include in Library, Share With..."

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• Is it a very bad idea to create disk image of mounted disk?

  - by Maciek Sawicki

  I would like to backup my server. For example using dd: dd if=/dev/md0 of=/some_network_share I wonder if this image will be vary inconsistent if /dev/md0 is mounted? Would it be possible to convert such dd image to vdi drive and create working virtual machine? Using this command for example: VBoxManage convertfromraw ImageFile.dd OutputFile.vdi Network traffic is disabled on firewall (there is only connection to/from one remote machine where image is copied).

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• How do I uninstall IE9 if it is half-installed and not on the uninstall programs list?

  - by BrianMoynihan

  Today I started to install Internet Explorer 9, but then before the auto-install can complete I forced it to quit. Now I am in an install neverland - it won't let me install because it says it is already there, and it won't let me uninstall from the Uninstall Programs menu because it doesn't doesn't show up in the list. Can anyone give me a backend way of deleting what has been installed so that I can re-run the install process? (Incidentally, I can launch IE9 but for some reason it doesn't download things correctly)

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• In 2011, what are the reasons to stick with plain text mails?

  - by Aaron Digulla

  People entering college today have never known a world without an Internet. HTML was invented 1980, that's more than thirty years ago or 1.5 generations. But plain text mails are still common despite all their problems: Encoding issues Wrapped code segments No links No way to use the "a picture says more than a thousand words" lore Most of the security risks are now handled by the underlying browser engine and smart settings like: Don't allow JavaScript in mails Don't execute attachments Don't download external resources (like web bugs) On top of that, only very few people still read mail only in command line tools like Mutt. Knowing Mutt myself, I'm pretty sure you can configure it to display HTML mail with, say, w3m. On top of that, most HTML mail capable clients send two versions of the mail (pure text with an HTML attachment). I'm not sure if there are any people left on the planet which still use a 56kbit modem to access their mail accounts. So what reasons are left to stick with plain text mails in 2011?

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• Vista Home Premium won't upload

  - by longhairedsi

  Hi, I have a sony vaio laptop(VGN-FW31J) running windows Vista Home Premium . I've had it over a year and file upload in a browser has never worked on any website in any browser(IE, Firefox, Chrome). I can select a file and the upload starts running but I always get a timeout. Sometimes it has worked once out of many attempts but only if the file is very small( < 50k). FTP does work. I've tried the following: Disabling anti virus Disabling firewall Can anyone help me here? i'm wondering if this is a vista problem or a vaio problem. Cheers

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• Office 2011 Mac, Sync calendars with google apps and iPhone

  - by Vincent

  Our office will be using Office 2011 for email contacts and calendar. Currently we are using apple mail/ical and address book. My primary concern is syncing calendars with google apps. That said our primary feature that we use google apps calendar for is sharing calendars. Best way to using office 2011... To sync calendars with an iPhone? To sync/share calendars between users? To sync contacts with an iphone? To sync/share contacts with between users? Users are on other computers and mostly work from home Needs to be fool proof once setup :-) I am not fond of the idea of syncing outlook with Mac address book and ical then to the iphone.

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• E-ink screens for desktop PC?

  - by Legooolas

  Are there PC monitors which are e-ink displays? E-ink is so much easier to read documents on that I'd rather like a secondary monitor just for documents, but I can't find any monitors available currently. Perhaps just an e-reader with some kind of remote control from a PC, so that it can be put in a cradle and display a document, but it would also need to have a fairly large screen to make it practical (perhaps something like A4 (EU) or Letter (US) sized?)

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• How do networking ports work? Can I configure the ports that client and server use?

  - by joedotnot

  Let's say i have a "server" program listening on address 1.2.3.4:69 (i.e. remote port 69) When i connect from a "client" program to it, typically i would specify the IP address + port of the target or server system; But what port would the client be using ? And how does the server know which port to connect back to the client on? I understand this question is very general, but just wanting to get a general feel for how things work. Then extending this to a specific protocol, say FTP (typical port 21), can I change it such that the server uses port 69, but the client uses port 100? And similarly, for Remote Desktop in WinXP (typical port 3389), i know how to change the server port to be something other than 3389, but how does one change what port the client uses (if at all possible)?

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• Is there a good alternative to Videora iPod Converter?

  - by Richard

  I use Videora to convert my videos (in DivX/XviD format) to something I can play on my iPod Classic. I really dislike it. It's clunky, riddled with adverts, sometimes doesn't convert properly (the infamous "invalid public atom" error - see Google for more) and has a UI that truly stinks. On the upside, it's free, accepts a list of video files (via the oddly hard to find "1-click convert" button) and just gets on with the converting as it already knows the correct settings for my iPod. One final nice touch is that once they are converted, it'll automatically upload them into iTunes. Are there any alternatives which have all the upsides but none of the downsides? Bonus points if they can set the metadata in iTunes correctly for TV shows (season, show, episode) and delete the converted file afterwards (as my iTunes settings means that a copy is made elsewhere). I've looked at a bunch of applications (handbrake, virtualdub, mediacoder, format factory, any video converter, convertxtodvd) but many of them fail the "just select a list of files and get on with converting" test - let alone all the other features I want. I have no desire to individually set the video size of each file or the codec or the post-processing options. I'm currently using the command line version of HandBrake (handbrakecli) and a hand-written DOS batch file to go through every file in a folder and convert it. It does most of what I want, just not in a very slick way. Can anyone recommend anything better? It needs to work on Windows 7 and be free.

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• Is is possible to slipstream DotNet 4 into Windows XP ?

  - by user43300

  I tried to use nLite but this program is no longer updated. And it seems it has no capability of dealing with dotNet. On my instalation CD there is DOTNETFX folder with version 1.1, but it seems even this old version is not installed with system. I also read somewhere that it is possible to download dotNet as system update, that is a file with name that begins wih KB.... , so that file could be properly digested by nLite ? Any help in this matter ?

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