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• Route53 only for wildcard subdomain

  - by Philippe Gerber

  We recently moved our web application to AWS. One thing that is still managed by our old hoster is DNS. OLD HOSTER example.com. NS <Old hoster's name server> example.com. A <ElasticIP on EC2 instance> *.example.com. CNAME example.com. ... I'm now trying to setup and play around with Route53 and use it for name resolution of our EC2 instances. ROUTE53 web-01.aws.example.com. CNAME ec2-xx-xx-xx-xx.eu-west-1.compute.amazonaws.com. web-02.aws.example.com. CNAME ec2-xx-xx-xx-xx.eu-west-1.compute.amazonaws.com. ... Now my question: Is it possible to forward DNS queries for *.aws.example.com to Route53 (ns-xxxx.awsdns-59.co.uk.)? What kind of record would I have to add?

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• Why does my computer not always automatically request a new DHCP lease when switching networks?

  - by KingJ

  I've noticed an interesting problem recently where my laptop will not automatically refresh my DHCP lease when changing between wireless networks. Instead, it will attempt to use the existing lease for the new network. Of course, since each network has different settings any connections will fail when using the old lease. While Windows will eventually request a new DHCP lease, it's often much faster for me to release the old lease and request a new, correct, lease. It puzzles me as to why this is not automatically done when associating to the network? One possible cause is that the laptop is put to sleep while connected to one network, then woken when in range of the other network. Nevertheless, I would expect that the lease would be renewed when the laptop associates to the other network rather than attempting to use the old lease. It should be noted that the two networks are completely different, both in terms of size, number of APs, network settings, SSIDs etc. One network is my home network and the other one is the campus-wide network at my University.

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• AWS instance went down for restart, came back up and has been "Waiting for network configuration... " for 12 hours

  - by kavisiegel

  What happened was about a month ago, I created a new instance, re-configured everything, and mounted the old instances drive to the new one. I then detached the old drive from the instance, but it was still mounted, so it errored out. Now, come the outage last month, and when the instance boots back up - the drive isn't there, because in the downtime, it dismounted. It hangs because the fstab is looking for it. I get word that the server's not up today, I check the logs, re-attach the drive and restart. Now I'm getting "Waiting for network configuration..." and it doesn't seem to be doing anything. Some googling told me that I'm going to need to start from zero again, which I don't think is right. I created a new instance, which booted no problem, then I stopped it and swapped the two old drives into the new instance. Still the same error. Using the fresh AMI, it worked. I figure it's just a misconfigured Amazon file. I can attach the drive to a functioning instance on the same AMI and copy some files over, then try again - but I don't know where to even start or what files to check.

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• Mixing both local and nonlocal addresses on three switches

  - by klew

  I have four computers that have nonlocal addresses like 150.X.X.X. Now I also get another few computers that should be only accessible through a gateway (it will be computing cluster) and they addresses are 10.0.0.X. I also wanted to include those four older computers to this new cluster, but I want them to be accessible from internet on nonlocal addresses (so I would like to set up them on both 150.X.X.X and 10.0.0.X addresses - I've set up it as interface eth0:0 since I have only one NIC). Those new computers have their switch and old computers also have their own switch. Both of them are connected to another (third) switch. The problem is that those old computers see each other (I can ping them), and also new computers see each other, but I can't ping old computer from new computer and vice versa. However pinging on nonlocal adresses works as expected. I looked into switch configuration and didn't find anything useful. I have no idea what I missed here. Can somebody help? All computers have Ubuntu Server 10.04

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• Ubuntu's garbage collection cron job for PHP sessions takes 25 minutes to run, why?

  - by Lamah

  Ubuntu has a cron job set up which looks for and deletes old PHP sessions: # Look for and purge old sessions every 30 minutes 09,39 * * * * root [ -x /usr/lib/php5/maxlifetime ] \ && [ -d /var/lib/php5 ] && find /var/lib/php5/ -depth -mindepth 1 \ -maxdepth 1 -type f -cmin +$(/usr/lib/php5/maxlifetime) ! -execdir \ fuser -s {} 2> /dev/null \; -delete My problem is that this process is taking a very long time to run, with lots of disk IO. Here's my CPU usage graph: The cleanup running is represented by the teal spikes. At the beginning of the period, PHP's cleanup jobs were scheduled at the default 09 and 39 minutes times. At 15:00 I removed the 39 minute time from cron, so a cleanup job twice the size runs half as often (you can see the peaks get twice as wide and half as frequent). Here are the corresponding graphs for IO time: And disk operations: At the peak where there were about 14,000 sessions active, the cleanup can be seen to run for a full 25 minutes, apparently using 100% of one core of the CPU and what seems to be 100% of the disk IO for the entire period. Why is it so resource intensive? An ls of the session directory /var/lib/php5 takes just a fraction of a second. So why does it take a full 25 minutes to trim old sessions? Is there anything I can do to speed this up? The filesystem for this device is currently ext4, running on Ubuntu Precise 12.04 64-bit. EDIT: I suspect that the load is due to the unusual process "fuser" (since I expect a simple rm to be a damn sight faster than the performance I'm seeing). I'm going to remove the use of fuser and see what happens.

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• Change the logical name of sql server express 2005 database file?

  - by oob

  In Microsoft SQL Server Management Studio Express for Sql Server Express 2005, I needed to copy a database for testing and keep it on the same server as the old database. I did the following: Right Click on Databases Created new database Detached the database I wanted to copy "Restored" my new database from the backup file of my old database. I did this by clicking the 'Overwrite the existing database' box on the Options pane, and I changed the paths in the 'restore as' options so that they pointed to my new .mdf and .ldf files. Everything is working like I want. Problem is, when I right-click - Properties - Files on my new database, the logical name of the .mdf file is the same as the logical name of the old .mdf file. They are actually different files - they just share the same logical name? I guess maybe this isn't a short-term problem, but I can see it confusing somebody down the road. Any way to change the logical name of the .mdf file? UPDATE EDIT - Apparently you can just change the logical name through the GUI by, get this, clicking on it and typing a new name. I could swear that was not possible when I posted this, but maybe it was and I somehow missed it! Either way - the solution below should still work but doing it through the GUI is also an option.

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• Connecting WD World Book to my new laptop using downloaded win 7 driver

  - by Jeanie

  HELP!!! I have just been reading through and seeing that you can connect using a USB straight to your laptop. This would be great is I actually had the cable! My problem is I have a lovely new laptop with windows 7 - I had to buy this as my old laptop isnt working anymore and I have just ordered an external sata enclosure to see whether I can get any inormation of the old drive and put onto my new laptop, so at least I don't lose any work. This in itself will probably present problems as my old OS was Windows XP! I will deal with that when i get to it!! My problem at present is that I have a World Book and I wish to connect and configure it to my new laptop but again I need to download drivers for Windows 7, which I believe I have done, but now I can't seem to work out just what to do next to help these 2 devices to recognize each other and configure. If anyone has any answers or could talk me through it I would be really grateful. Thanks - Jeanie

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• Logging won't stop on log file after renaming/moving it.... how do I stop it?

  - by Jakobud

  Just discovered that logrotate is not rotating our firewall log. So it's up to 12G in size. I need to split up the file into smaller chunks and start manually rotating them so I can get things back on track. However before I start splitting the firewall up, I need to stop the firewall from logging to the current firewall log file and force it to start logging to a new empty file. This way I'm not trying to split up or rotate a log file that is still constantly growing. I tried to simply do this: mv firewall firewall.old touch firewall I expected to see the new empty firewall file to start growing in size, but no... the firewall.old is still be logged to. Then I tried to start/stop iptables. No change. firewall.old is still the log file. I tried to move it to another directory. That didn't help. I tried to stop iptables, then change the filename and create a new firewall file and then start iptables again, but no change. How do I stop the logging on this file and force it to start logging on a new file?

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• Did Windows 7 Startup Repair trash My Documents?

  - by Metaphile

  Earlier today, I rebooted my computer. Partway through the boot process, it shut down suddenly. When I tried again, I was prompted to run Startup Repair, and I did. Afterwards, my computer booted normally and everything seemed to be in order. Then I noticed that my My Documents folder contains a mix of old and new files. On closer inspection, it appears that Windows has reverted my system to a previous state. Two things puzzle me: 1) According to Microsoft, "System Restore does not affect personal files, such as e-mail, documents, or photos [...]", yet many of my personal files have been affected. 2) Why were some things reverted, but not others? I had recently reorganized a bunch of files in My Documents. The reverted directory structure seems to be a hybrid of old a new, with a lot of new stuff missing. It's hard to say for sure, but it looks like the stuff that's missing would have been in conflict (two folders with the same name, for example), and Windows favored the old stuff. Is this normal behavior for Startup Repair/System Restore? To modify personal files, I mean? Is there a pattern to the mess it's made of My Documents?

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• How do I remove a printer connection without the user's intervention?

  - by 1.618

  Here's the situation: We're replacing 11 printers with newer models, and we'll be installing them on our print server and sharing them out. The plan is to share the new printers under different names than the ones they're replacing, and un-share the old ones. So I need to come up with a way to remove the client connections to old printers automatically. Clients are mostly Windows 7 with a few XP. My first idea was to call prnmngr.vbs from the login script to remove each old printer explicitly by name. The problem is that some users don't log out when they're done for the day, so I can't count on their login script running before they next need to print. I could remotely run prnmngr.vbs using SCCM, but if it's not 'impersonating' the user, I don't think it will remove their printers. Any ideas? Could I lookup how to access WMI using c# code and write a "trojan" to remove specific printers without requiring the user to do anything? (I'm only half joking). I'm open to any suggestion! Thanks!

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• Prevent RDP logon brute force in mikrotik router via winbox

  - by holian

  Masters, I need help, how to config our router to block RDP brute force attacks I would like to set our router to only allow RDP connection from a specified country (our specified IP ranges), plus i need to set up router to block (take ips to black list) and drop brute force attepmst to specified port numbers. I try to set this with changeing the ftp port to rdp port. http://wiki.mikrotik.com/wiki/Bruteforce_login_prevention_%28FTP_%26_SSH Any suggestion tnx. H Current configuration: I try to configure the router via Winbox. I set some NAT rules (from dyndns to local address, rdp port) In the filter rules tab: I'm not sure this configuration should do the trick?! Is the content text "530 login incorrect" is fit for RDP connection to? Because in the tutorial used for filtering FTP connection. How to set router to allow RDP attempts from specified IP ranges? Thank you // New config

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• iptables is not allowing me to contact my dns nameservers

  - by user1272737

  I have the follwing iptables rules: Chain INPUT (policy DROP) target prot opt source destination ACCEPT tcp -- anywhere anywhere tcp dpt:ssh ACCEPT tcp -- anywhere anywhere tcp dpt:http ACCEPT tcp -- anywhere anywhere tcp dpt:https ACCEPT tcp -- localhost.localdomain anywhere tcp dpt:mysql ACCEPT tcp -- anywhere anywhere tcp dpt:14443 ACCEPT tcp -- anywhere anywhere tcp dpt:ftp ACCEPT tcp -- anywhere anywhere tcp dpt:ftp-data ACCEPT tcp -- anywhere anywhere tcp dpt:xxxxxxx Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination When I turn off iptables I am able to use wget and all other commands. When these rules are enabled I cannot connect to any address. Any idea why this would be?

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• AesManaged and RijndaelManaged

  - by xscape

  Im currently developing a Silverlight application that connects to an old webservice. Our old webservice uses an encryption tool which silverlight does not support. Finally, we decided to used AesManaged for encryption, however, our webservice does not support AesManaged. Is their a way to decrypt an AesManaged to RijndaelManaged? If yes, can you please post a sample snippet? Your feedback is highly needed. Thank you.

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• TFS 2010, can I migrate source code only ?

  - by driis

  Our old TFS 2008 installation is getting old, and we would like to migrate to TFS 2010. However, the structure of our team projects is not so well thought out, and there has been various experiments with process templates and editing of work items and so on. Therefore, I would like to migrate our source code to TFS 2010, with full history, and keep all other aspects of the new TFS 2010 installation as clean as possible. How can I do that ?

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• Winforms BindingSource

  - by Erez

  I have a binding source object that fills some textboxes. In run time, after editing the textboxes I want to be able to retrieve the old values. how can I retrieve the Textbox's old value and refresh the screen ? Maybe the binding source has history or something ?!

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• Why isn't ICMP routing with iptables nat routing

  - by Scott Forsyth - MVP

  I'm using iptables on Ubuntu server to route a public IP to a private IP. I want to nat all traffic, including 80, 443 and ICMP. However, it appears that ICMP isn't routing. I have a steady ping going to the public IP and it never stops, even with NAT pointing to a bogus IP. Here are the rules that I'm using: iptables -t nat -I PREROUTING -d 206.72.119.76 -j DNAT --to-destination 10.240.5.5 iptables -t nat -I POSTROUTING -s 10.240.5.5 -j SNAT --to-source 206.72.119.76 I tried with rules for ICMP specifically, but no such luck: iptables -t nat -I PREROUTING -d 206.72.119.76 - icmp --icmp-type echo-request -j DNAT --to-destination 10.240.5.5 Any ideas?

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• Apache2 - mod_expire and mod_rewrite not working in httpd.conf - serving content from tomcat

  - by Ankit Agrawal

  Hi, I am using apache2 server running on debian which forwards all the http request to tomcat installed on same machine. I have two files under my /etc/apache2/ folder apache2.conf and httpd.conf I modified httpd.conf file to look like following. # forward all http request on port 80 to tomcat ProxyPass / ajp://127.0.0.1:8009/ ProxyPassReverse / ajp://127.0.0.1:8009/ # gzip text content AddOutputFilterByType DEFLATE text/plain AddOutputFilterByType DEFLATE text/html AddOutputFilterByType DEFLATE text/xml AddOutputFilterByType DEFLATE text/css AddOutputFilterByType DEFLATE text/javascript AddOutputFilterByType DEFLATE application/xml AddOutputFilterByType DEFLATE application/xhtml+xml AddOutputFilterByType DEFLATE application/rss+xml AddOutputFilterByType DEFLATE application/javascript AddOutputFilterByType DEFLATE application/x-javascript DeflateCompressionLevel 9 BrowserMatch ^Mozilla/4 gzip-only-text/html BrowserMatch ^Mozilla/4\.0[678] no-gzip BrowserMatch \bMSIE !no-gzip !gzip-only-text/html # Turn on Expires and mark all static content to expire in a week # unset last modified and ETag ExpiresActive On ExpiresDefault A0 <FilesMatch "\.(jpg|jpeg|png|gif|js|css|ico)$" ExpiresDefault A604800 Header unset Last-Modified Header unset ETag FileETag None Header append Cache-Control "max-age=604800, public" </FilesMatch RewriteEngine On # rewrite all www.example.com/content/XXX-01.js and YYY-01.css files to XXX.js and YYY.css RewriteRule ^content/(js|css)/([a-z]+)-([0-9]+)\.(js|css)$ /content/$1/$2.$4 # remove all query parameters from URL after we are done with it RewriteCond %{THE_REQUEST} ^GET\ /.*\;.*\ HTTP/ RewriteCond %{QUERY_STRING} !^$ RewriteRule .* http://example.com%{REQUEST_URI}? [R=301,L] # rewrite all www.example.com to example.com RewriteCond %{HTTP_HOST} ^www\.example\.com$ [NC] RewriteRule ^(.*)$ http://example.com/$1 [R=301,L] I want to achieve following. forward all traffic to tomcat GZIP all the text content. Put 1 week expiry header to all static files and unset ETag/last modified header. rewrite all js and css file to certain format. remove all the query parameters from URL forward all www.example.com to example.com The problem is only 1 and 2 are working. I tried a lot with many combinations but the expire and rewrite rule (3-6) do not work at all. I also tried moving these rules to apache2.conf and .htaccess files but it didn't work either. It does not give any error but these rules are simple ignored. expires and rewrite modules are ENABLED. Please let me know what should I do to fix this. 1. Do I need to add something else in httpd.conf file (like Options +FollowSymLink) or something else? 2. Do I need to add something in apache2.conf file? 3. Do I need to move these rules to .htaccess file? If yes, what should I write in that file and where should I keep that file? in /etc/apache2/ folder or /var/www/ folder? 4. Any other info to make this work? Thanks, Ankit

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• Why aren't we programming on the GPU???

  - by Chris

  So I finally took the time to learn CUDA and get it installed and configured on my computer and I have to say, I'm quite impressed! Here's how it does rendering the Mandelbrot set at 1280 x 678 pixels on my home PC with a Q6600 and a GeForce 8800GTS (max of 1000 iterations): Maxing out all 4 CPU cores with OpenMP: 2.23 fps Running the same algorithm on my GPU: 104.7 fps And here's how fast I got it to render the whole set at 8192 x 8192 with a max of 1000 iterations: Serial implemetation on my home PC: 81.2 seconds All 4 CPU cores on my home PC (OpenMP): 24.5 seconds 32 processors on my school's super computer (MPI with master-worker): 1.92 seconds My home GPU (CUDA): 0.310 seconds 4 GPUs on my school's super computer (CUDA with static domain decomposition): 0.0547 seconds So here's my question - if we can get such huge speedups by programming the GPU instead of the CPU, why is nobody doing it??? I can think of so many things we could speed up like this, and yet I don't know of many commercial apps that are actually doing it. Also, what kinds of other speedups have you seen by offloading your computations to the GPU?

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• proxy pass for activeMQ

  - by user1172482

  I have a apache server that I'm trying to use for proxy access my activeMQ admin page. I am able to load the inital landing page properly, but I can't seem to load any of the sub-pages (Queues, Connections, etc.). My proxypass rules on the apache server are the following: ProxyPass /foo http://10.5.124.108:8161/admin ProxyPassReverse /foo http://10.5.124.108:8161/admin The activeMQ installation included a activemq-httpd.conf file in /etc/httpd/conf.d/. Proxy connections there are enabled: ProxyRequests On ProxyVia On <Proxy *> Allow from all Order allow,deny </Proxy> ProxyPass /admin http://localhost:8161/admin ProxyPassReverse /admin http://localhost:8161/admin ProxyPass /message http://localhost:8161/admin/send ProxyPassReverse /message http://localhost:8161/admin/send From what I've read the proxypass rules should be recursive (the rule for /foo should also work for /foo/bar). Is there something else that I'm missing here that's preventing me from accessing pages beyond the initial admin landing page?

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• .htaccess 301 redirect without GET var

  - by tvgemert

  Hi, For a website I'm currently working on we're redirecting our old URL's permanently to new ones like this: Redirect 301 /oldfile.php http://www.site.com/show/newurl Now I come across this situation in which the old url has a get var like: Redirect 301 /oldfile.php?var=name http://www.site.com/show/newurl This will redirect the oldfile to the new url plus it adds the get var so it redirects to: http://www.site.com/show/newurl?var=name How would I set up this redirect without the get var?

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• Creating a CD-burning feature for a music player based on Java

  - by jjanggoo

  Hi, I'm trying to create a CD-burning feature for a Java-based music player for my school project. Since I'm new to real-life programming (I've only learned to write codes on AP Computer Science A level), I don't know how I can apply the concepts I learned from APCS A to this task. A friend of mine who is studying computer science at graduate school told me to "look up the cd player control functions and add methods in those classes to read in data that you want to write to the CD, write it to a buffer, write everything in the buffer to the CD itself, clear the buffer and then write a new chunk of data into the buffer," but I can't quite grasp what this means, and tt's really hard to contact her right now because she's busy working on her dissertation. Can someone from this forum please guide me through & explain the general concepts? Thank you!

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• Linux networking "jail" for a single process

  - by halp

  I need to tune up a networking app for network specific things like: make it use a DNS server different than the default one from /etc/resolv.conf make sure it does not try to connect to certain hosts/ports using tcp/udp connections I know I can get away with just modifying /etc/resolv.conf and writing some iptables rules, but going for a default DENY firewall policy for outgoing IP packets can trigger malfunctions in other services running on the server. I know I can set up a virtual machine with a whole OS and run my app there, but it seems a bit overkill. Is it possible to have a networking "jail" for a single app (think single Linux process) that could accept iptables-like rules for network traffic (think in terms of IP packets and above) allowed to and from this particular app? Maybe this is achievable through some dynamically loaded library that can deal with the networking layer, the same manner tsocks does, but more fine-grained?

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• Correct way to treat iptables init failure?

  - by chris_l

  Hi, I'm initializing my iptables rules via /etc/network/if-pre-up.d/iptables, using iptables-restore. This works fine, but I'm a bit worried about what would happen, if that script failed for some reason (maybe the saved iptables file is corrupt or whatever). In case the script failed, I'd like to: Start up my network interfaces without any iptables rules Start up OpenSSH server But not any other services like web server, ... (and maybe stop running instances) Is there a good canonical way to do that? Going into a lower init stage? - I haven't done that in a long time, and I think a lot about init has changed in recent years (?) - which stage should I drop to, and would the OpenSSH server and my network interfaces still run? Thanks Chris (On Debian Lenny)

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• Can't access Linux machine from the network, network from the machine is fine

  - by Matt

  I'm having issues with a machine that stopped replicating with mysql. It's managed by a guy on another continent but recently I've had to get involved. The server is running Ubuntu server 9.10 I can't log in with SSH, there is no response. On the server itself I can ssh to localhost fine. I thought maybe it's the firewall rules. I'm no expert on IP Tables, but I believe that's not the issue as I removed all the rules. But it still won't let me in. Any ideas? it's acting from other machines as though the service isn't listening, but I know that it is. It's like this for all services.

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• linq where clause and count result in null exception.

  - by nestling

  The code below works unless p.School.SchoolName turns out to be null, in which case it results in a NullReferenceException. if (ExistingUsers.Where(p => p.StudentID == item.StaffID && p.School.SchoolName == item.SchoolID).Count() > 0) { // Do stuff. } ExistingUsers is a list of users: public List<User> ExistingUsers; Here is the relevant portion of the stacktrace: System.NullReferenceException: Object reference not set to an instance of an object. at System.Linq.Enumerable.WhereListIterator1.MoveNext() at System.Linq.Enumerable.Count[TSource](IEnumerable1 source) How should I handle this where clause? Thanks very much in advance.

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