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• DNS failover across multiple datacenters?

  - by Jae Lee

  I've got a site that is starting to get a lot of traffic and just the other day, we had a network outage at the datacenter where our loadbalancer (haproxy) is hosted at. This worried me as despite all my efforts of making the system fully redundant, I still could not make our DNS redundant, which I think isn't an easy solution. Only thing I was able to find was to sign up for DNS failover from places like dnsme, etc .... but they cost too much for budding startups. Even their Corporate plan only gives you 50 million queries per month and we use that up in a week. So my question is, are there any self hosted DNS we can do that provides the failover like how dnsme does it?

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• How to host a scalable social networking app

  - by christopher-mccann

  I am in the middle of developing a social networking application for a very select user niche which could scale to a few million users. Right now I have always hosted applications on RackSpace Cloud and I have no issues with them at all - always been a really good service and never had any downtime. My question is though does anyone think that cloud computing is not the way to host scalable web apps? Or can anyone with experience of this recommend a better solution. I have always shunned trying to run big servers from my own facilities as I think it seems silly to go to the expense of bringing in big alternative power supplies and all the other necessary precautions when other companies already do this. I looked at managed hosting services but this proved to be a bit too expensive for us at the start and the scalability of it wasnt good enough - it would take a day or two to get a new server provisioned. Therefore I ended up on a cloud platform. If anyone has any recommendations or advice it would be greatly appreciated.

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• hung up troubleshooting packet discards

  - by Chris Satola

  I realize my question is generic, but hopefully someone may have some guidance for me. My network consists of Cisco switches. I am seeing a significant amount (upwards of millions of packets per day) transmit drops between two switches. One being a 3750 and the other a 3560. The peak throughput of this link is only upper 400Mbps, so it shouldn't be a bandwidth issue. At this point, I am sort of clueless where to look or what tools I can use to determine what packets are dropping and why. I can setup a SPAN port on that link and wireshark it, but I don't know if that could tell me anything. Does anyone have any suggestions? Thanks in advance.

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• Logrotate, is this a proper config for what I want to do?

  - by Felthragar

  I started using logrotate a few days ago on a new server setup (actually three of them). My config is as follows. /var/www/mywebsite.com/logs/*.log { rotate 14 daily dateext compress delaycompress sharedscripts postrotate /usr/sbin/apache2ctl graceful > /dev/null endscript } Problem is that this is putting several days of logs into the same file. For example, I've currently got a file called access.log-20121005 which has logs for Oct 3rd, Oct 4th and Oct 5th in it. Is that proper behaviour? What I want for it to do is to create one logfile for each day and keep 14 days of logs. Any help appreciated, thanks.

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• ssh-agent is broken after running Meerkat - can connect to git in terminal but not in Tower - no keychain access

  - by marblegravy

  My mac running Snow leopard 10.6.8 is having trouble handling it's ssh keys. I could previously access all my git repo's via Tower without an issue. The other day I ran Meerkat to see what it was about and it looks like it has broken the way ssh works. Terminal doesn't seem to have a problem and can still connect to Git, but it can't access the keychain. Tower doesn't seem to be able to access anything. The Tower support crew have been super helpful, but I wanted to float this here and see if anyone has any ideas on how to fix my problem. The only hints I have are: $ which ssh returns: /usr/bin/ssh and echo $SSH_AUTH_SOCK returns: /tmp/ssh-nBhRYVEg8t/agent.199 (This one seems to be wrong as I think it's supposed to point to a Listener, but no idea how to fix it) additional: Keychain first-aid finds no problems. The problem seems to be that ssh-agent is not being run properly... but that's just a guess.

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• How to rename a BTRFS subvolume?

  - by hochl

  I have a BTRFS filesystem with a set of subvolumes in it. So far so good. I need to change the name of a subvolume, unfortunately the btrfs program does not allow me to rename a subvolume. Searching with Google has yielded some results, one said I can just mv, the other said I can just snapshot to a new name and delete the old subvolume. Before I crash my partition and have to reload it from the backup (it's quite large), my question is: What is the currently best way to rename a subvolume? Is it ok to just mv it, or will it invalidate some internal structures? Is making a new snapshot and removing the old subvolume the way to go, or has this some drawbacks? I know everything is still experimental, but for my purposes it has been working quite well (so far, and I have incremental backups for each day).

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• Packaging python software with custom dependencies

  - by viraptor

  Hi, I'm looking for a good way to package a Python application that is going to be deployed on a Debian server. The application itself depends on some modules which are not included in base Debian repository, although they might be in the future. This creates some problems... I depend on some patches to those modules. If the original module gets installed one day, the application will break. However if I install everything I need in a virtualenv just for that application, I lose the ability to upgrade Python itself (in case of security updates). The third option would be to rename my fork of the upstream module and just treat it as a completely separate one. But that would mean changing the code (not much work, but it wouldn't be that clean / universal anymore). Are there any other options that I missed? Are there any pros / cons I didn't see in the solutions above?

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• How to install and Configure MTA on Linux [closed]

  - by Umair Mustafa

  I need to know which MTA's is better and simple to handle and configure in linux. As I need to run a script that will send me the output of that command whenever it will run using cron. Ok the case is this. Every day I have to manually check the Disk space of server which are more than 30 which is headache and have to document that. So I will simply add the follwing command DF- H and the output of this command should be send on my email. So now IF u got the story then tell me what MTA is better sendmail, postfix and some instructions on HOW TO INSTALL and CONFIGURE it. And after configuring the How do I add the DF -H so that it will start seniding me the output on my email. Thanks in advance.

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• IBM x226 server with Windows 2003 freezing and showing one HDD degraded

  - by Zvonko Telefonko

  We have an IBM x226 server with Windows 2003 running on it. For weeks it's been very slow and it freezes at least once each day. At the boot it show message "degraded" for one HDD and optimal for other HDDs. We have 4 HDDs in it set up in Raid 1. HDD 1 - HDD 2, HDD 3 - HDD4. It seems that HDD2 is the one who is causing problems (showing degraded status). There's an amber led blinking on it together with the green one. We installed ServerRAID manager downloaded from IBM and it gave us option for "rebuild". But the server froze at some point and now it's rebuilding from start again. I've done some Googling and it says that it could be to failing HDD or some cache battery. How can we verify what is the cause of this?

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• IIS site hacked with ww.robint.us malware

  - by sucuri

  A bunch of IIS sites got hacked with a javascript malware pointing to ww.robint.us/u.js. Google cache says more than 1,000,000 different pages got affected: http://www.google.com/#hl=en&source=hp&q=http%3A%2F%2Fww.robint.us%2Fu.js http://blog.sucuri.net/2010/06/mass-infection-of-iisasp-sites-robint-us.html My question is: Did anyone here got hacked with that and still have any logs (or network dump) available for analysis? If you do, have you spotted anything interesting in there? Sites as big as wsj.com got hacked and some people are saying that maybe a zero-day on IIS/ASP.net is in the wild...

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• Fine-tuning a LNMP stack

  - by Norman

  I'm in the process of setting up a server with 4GB RAM and 2 CPUs. The stack will be CentOS + NGINX + MySQL + PHP (with APC) and spawn-fcgi. It will be used to serve 10 Wordpress blogs, 3 of which receive about 20,000 hits per day. Each Wordpress instance is equipped with the W3 TotalCache. I have a few variables to play with: NGINX (How many worker_processes, worker_connections, etc) PHP (What parameters in php.ini should I change? What about apc?) Spawn-fcgi (Right now I have 6 php-cgi spawned. How many of them should I have?) I realize it's hard to tell without testing, but if you could please provide me with some ballpark numbers, that would be helpful too.

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• Incremental backup services with change only charges?

  - by wowowewah

  I'm looking for online backup services that provide incremental, change-only backups. I'm looking to transfer as little data as possible and would like to find a service that provides full backups every week along with incremental backups every day. Are there any specialist companies that deal with this or do I just use standard backup ones? Any recommendation appreciated. To expand on this Im looking for software/services which work on Unix. I guess Linux is fine aswell as FreeBSDs Linux compatibility layer should run it. Oh and command line would be ideal and not require the use of X Window. Thanks.

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• Running rsync on network connect

  - by user40495

  I have one mac which is always on and is my main computer. I also have a MacBook and I'm trying to Sync my iphoto library. So I can successfully use rsync to sync files. I'm using a cron to have it run once a day. In reality the macbook isn't always on, so I'm looking for a way to run rsync when ever the two computers are connected on the same wifi network. So I'm guessing the best place is to somehow run rsync when the airport is connected. Whats the best way

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• Is there a smarter Find files utility for Windows 8 than Windows key + F?

  - by Clay Shannon

  Is there any utility for Windows 8 that will basically do the same thing the old "Find" dialog in Explorer did? Often times (many times a day) I need to find a particular file, and I don't know the name of it or where it is, but I can remember a phrase in it, and approximately when it was written, e.g., it has the phrase "Duckbilled Platypus" in it and was written sometime in the last week. The Find Files functionality in Windows 8 is lame by comparison; I know there are probably geeky ways to jump through hoops and do it, but I don't want to have to write GREP expressions, I want something easy like the old functionality...

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• Windows 7 systeminfo reporting incorrect System Boot Time?

  - by rdingwall

  I work 9-5 and switch my PC off when I leave the office each day. When doing timesheets I need to know what time I got to work, so I usually use cmd systeminfo for finding the System Boot Time. Since upgrading to Windows 7 however, it's started reporting bizarre numbers between 11pm-2am instead of 8-9am. Today it says it booted at 11:34pm last night! I checked the event log and there is no entries between when I shutdown at 5:30pm yesterday and booted around 8am this morning. Has anyone else encountered this?

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• Running rsync on network connect

  I have one mac which is always on and is my main computer. I also have a MacBook and I'm trying to Sync my iphoto library. So I can successfully use rsync to sync files. I'm using a cron to have it run once a day. In reality the macbook isn't always on, so I'm looking for a way to run rsync when ever the two computers are connected on the same wifi network. So I'm guessing the best place is to somehow run rsync when the airport is connected. Whats the best way

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• How to stop jucheck from running? Java won't remember "Check for Updates Automatically" setting.

  - by Ken

  I've installed Java on Windows Vista, and every day I get a Vista security warning asking me if I want to run "jucheck". Apparently this is the Java automatic updater. Well, I don't want it to run on its own, ever. I cancel it, and quit it. I right-click on the taskbar and unclick "Check for Updates Automatically", and then click "Never Check", and "Apply". And yet, it never remembers this setting. If I come back to the "Java Control Panel" right after clicking "OK", the very same box is checked again, all on its own. Is there some way to kill jucheck once and for all? If I simply delete jucheck.exe, will Java (other than the automatic check) still work, and will manual updates still work, and will it stop even trying to update every morning?

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• How do I convert an animated GIF to a YouTube friendly video format?

  - by Dave Webb

  My son has made some animations with Pivot Stickfigure Animator which we'd like to upload to YouTube. The problem is Pivot saves as animated GIFs which I can't upload to YouTube. The Wikipedia article recommends using Windows Movie Maker to convert GIF to WMV, but unfortunatley I'm using Window 7 for which you can get the new Windows Live Movie Maker which doesn't seem to support GIFs. I Googled and found an article which said to use Beneton Movie GIF to convert animated GIF to AVI, but this seemed to rely on a 3rd Party application which wasn't installed and so failed. Installing the missing application - pjBmp2Avi - by hand and adding it to the path still didn't allow Beneton to do the conversion. I hoped FFmpeg might do the trick but this only outputs to animated GIFs, it won't read from then. Further Googling found lots of applications with 30 day trials and so on but I was hoping for something free. So any suggestions on how I can convert an animated GIF to a movie file on Windows using free (as in beer) software?

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• Why do my proxy settings keep changing?

  - by tjrobinson

  I am running Windows 7 and a few times a day the "Use a proxy server for your LAN (These settings will not apply to dial-up of VPN connections)." under "Local Area Network (LAN) Settings" checkbox becomes checked seemingly on it's own. Am I pressing some kind of hidden keyboard shortcut accidentally? What sort of applications might alter this setting and why? Unfortunately as this is a developer box, there's a lot of stuff that could be interfering, e.g. Visual Studio 2010, Windows Azure SDK and various browsers. Has anyone else come across this?

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• Is zip's encryption really bad?

  - by Nifle

  The standard advice for many years regarding compression and encryption has been that the encryption strength of zip is bad. Is this really the case in this day and age? I read this article about WinZip (it has had the same bad reputation). According to that article the problem is removed provided you follow a few rules when choosing your password. At least 12 characters in length Be random not contain any dictionary, common words or names At least one Upper Case Character Have at least one Lower Case Character Have at least one Numeric Character Have at least one Special Character e.g. $,£,*,%,&,! This would result in roughly 475,920,314,814,253,000,000,000 possible combinations to brute force Please provide recent (say past five years) links to back up your information.

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• How much packet loss is normal?

  - by Fabian

  I started monitoring our network using SmokePing. Users occasionally complain about bad network connections, but the problems went away after some minutes usually. I now wanted to get some more quantitative information about those problems. SmokePing regularly pings servers inside our network, in a connected network and outside hosts. I only have a limited amount of control over our internal network and none at all for the connection to the outside and to the second network. I now see quite often (2-4 times a day) that packets to the second network and the outside are dropped. Most of the times it is 1-2 packets out of 20, sometimes more. Inside our internal network no packets are dropped. Is this an expected amount of packet loss, or does it indicate that something is wrong? I'm mainly wondering if I should bother the university IT department about it, or if I should just accept it as it is.

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• How complex of a daemon should be run through inetd?

  - by amphetamachine

  What is the general rule for which daemons should be started up through inetd? Currently, on my server, sshd, apache and sendmail are set up to run all the time, where simple *NIX services are set up to be started by inetd. I'm the only one who uses ssh on my computer, and break-in attempts aren't a problem because I have it running on a non-standard port, and my HTTP server gets maybe 5 hits a day that aren't GoogleBot. My question is, what are the benefits vs. the performance hits associated with running a complex daemon like sshd or apache through superserver, and what, if any successes or failures have you had running your own daemons in this manner?

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• windows server backup 2008 R2 - what is generating all the change data?

  - by bobjandal

  We have a small relatively idle windows server 2008 R2 installation that does basic filesharing and exchange for about 10 not very active users. When running a windows server backup, the incremental data daily is about 20GB. This is not coming from users shared files, nor from changes in their mailbox sizes. The total size of the installation is 249GB, which is mostly old files. Where is all this data coming from, and how can I reduce it ? Using online backup of the vhd file from the backup is taking a while because of this daily change. Is there some way I can at least see what files are changing and contributing to this data ? Options I can think of but am not sure about: 1) pagefile churning - altho the backup does not include the pagefile, perhaps the changed blocks left behind are included ? 2) logs or something ? but the installation size stays the same every day 3) should I zero free space using sdelete before backing up perhaps ?

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• pdftk issue after updating Ubuntu from 9.04 to 9.10

  - by Crazydog

  We upgraded our server to 9.10 from 9.04 the other day, and it all went well except for one rather important program. We're using pdftk to automatically generate filled out pdf forms. On 9.04, it worked just fine. After updating to 9.10, the pdf forms would no longer be filled out - they'd just be empty. I discovered that if I try to create an fdf file via pdftk from my PDF form, it just creates an empty fdf with no fields. On windows, pdftk generates the fdf file just fine. Any ideas? Thanks.

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• Why do my download speeds drastically vary during a download?

  - by J. Anthony Carter

  I watch the download speed rise and fall like waves in a storm. At night, during low bandwidth usage I have achieve speeds as high as 3.23 M/sec but the watch them decline to 250 K/sec. and then climb back up. Over and over. During the day my best is around 1.67 M/sec with lows into the 65 K/sec. On top of this, why does a download need to slow down when approaching the end of the download? It's not like a multi-hundred ton train needing to decrease speed as it approaches the station.

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