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• Server responses "bus error" to every command

  - by Temnovit

  I have a linux machine dedicated to MySQL server with a pretty high load. Today I woke up and was terrified to see, that database server is down. I could connect to it via SSH, but it was responding with bus error to each and every command. [root@r1304 home]# ls Bus error [root@r1304 home]# tail /var/log/messages Bus error [root@r1304 home]# reboot Bus error [root@r1304 home]# free -m Bus error [root@r1304 home]# chkdisk Bus error I went to Data Center and did a hard reset, which seemed to help, but after a half an hour situation reapeated and now I can't even connet via SSH anymore. Any ideas what this could be? how to diagnose such a problem and what are possible fixes? Server has 32 GB RAM, 2xSSD drives with software RAID UPDATE According to Zabbix, when MySQL died, number of processes stated to increase drammaticaly, until I did a hard reset. What could those be? Number of processes

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• Why are my DNS Lookups so long (300+ms) when accessing my web site?

  - by Travis

  I'm running a Fedora 11 server with Apache 2. I'm trying to optimize so things are as fast as possible from the server side, and I'm noticing (via Firebug for Firefox) that upon loading the homepage of one of the sites on the web server that for every file it loads (HTML, CSS, JavaScript, GIF, PNG, JPG, etc.), it does a DNS lookup. All of the files it is looking up are local to the server, so I'm surprised to see it even do a DNS lookup. Also, each of these lookups is in the 150-450ms range, which is way too high for my liking. I've tried adjusting /etc/resolve.conf to use Google's Public DNS servers. I restarted the network service and tapped the page again, but the numbers didn't go down. I've reverted back to the default DNS servers since I didn't see any gain. Any ideas on what is causing it to: a) do the dns lookup in the first place, and b) take so long when doing the actual lookup? Thanks in advance.

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• latency, regular alternations. Pfsense, network

  - by Tillebeck

  Any idea why grapgh is a shown? It i two pfsense boxes and I have not looked into where they ping to and if it is related to the server they ping. Trafic graphs are following a normal 24 hour cycle and not related to either of the latency graphs Img1: High frequent ulteration in latency. Just started a few days back. Peaks are not perfectly regular but varies from 40min to 1hour Img2: This is a different router on another internet connection. Most of our routers shown this kind of latency graphs - so for our setup it is "normal". Please note that second graph is for a whole week and not just some hours

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• Can I run my OS from a DVD?

  - by Dave D

  I'm thinking of ways to get around the high cost of hard drives lately. I was thinking an optical jukebox would be interesting (though more expensive than just buying a hard drive), then thought I've heard of OS's run from DVD so why not boot from a Blue-ray drive. I think a smaller OS like a linux flavor would work. I'd like to know if there's a way I could burn Windows 7 to DVD for this use. Just curious. Anyone know if this is possible? Thanks, Mac

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• Google Chrome passphrase : where is it?

  - by danielson

  Every time I do a fresh install, Google Chrome asks me for my passphrase. Have searched high and low in Google's help forum and have yet to receive or find any form of response. When I do a fresh install, if I try to enter the passphrase (with all possible passwords i can recall) nothing works and I can't recover my extensions, bookmarks etc. On the other hand, if I wait a bit, everything falls to place. I close that window asking for passphrase and all my extensions, bookmarks are back. The failure to enter a proper passphrase code gets me a message to change my passphrase in my account settings. Who knows where that is! No one at Google's forum seems to know anything about this "passphrase".

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• Formatting a 5.25" floppy disk

  - by Spütnik

  So after the massive trouble of finding a 5.25" floppy drive and a connecting it up, then changing the BIOS so it's set as my A: drive, I tried to format a couple of high-density 1.2MB floppy disks using the "format A:" command in Command Prompt. Both times it formatted only 160KB and left it at that. If I then check the amount of space on those disks, it then comes up as 160KB. Why is this the case? How can I get my the full value out of my 1.2MB? For reference, I have a Mitsubishi MF504C-318UG, which should support 1.2MB disks.

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• Tests for hard drive health

  - by Samik R

  I have a 5-year old hard drive (bought new at the time), but it was sitting in my closet for 5 years, unused. I have just started using it, and seems to be getting a whirring sound (rather distinct from the other noises like fans etc.). I ran a few diagnostics tests, like Seagate's SeaTools, and the SMART test, and a few generic tests and all passed. Should I be concerned? Is there any other test that I should run? It's an internal IDE WD 5400RPM drive. Being used for a desktop, which is itself pretty high-end (AMD Phenom II X6 1100T, AMD Radeon GPU etc.), but would be used rather occasionally to begin with (avg. 1-2 hrs. per day). Thanks for any pointers.

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• mount samba share on a vmware instance

  - by Riduidel

  I've a windows machine in which a linux server is run by a "VMWare player". From the windows machine, I want some folders to be mounted on the Linux virtual server. All this is done in a maven build (which is quite irrevelant here, in fact). From what I understand, to make these windows folders available as mountable ones, I have to do the following operations Share the folders as Samba ones using net share, this I have done. Access my virtual server and check which folders are already mounted (which seems to be doable using a less /etc/fstab), this I'll do soon Mount my samba shares using smbmount All that seems to my by far too hackish code. Could the same be done using ... say ... JMX/SNMP or any other high-level technology ?

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• nginx errors: upstream timed out (110: Connection timed out)

  - by Sparsh Gupta

  Hi, I have a nginx server with 5 backend servers. We serve around 400-500 requests/second. I have started getting a large number of Upstream Timed out errors (110: Connection timed out) Error string in error.log looks like 2011/01/10 21:59:46 [error] 1153#0: *1699246778 upstream timed out (110: Connection timed out) while reading response header from upstream, client: {IP}, server: {domain}, request: "GET {URL} HTTP/1.1", upstream: "http://{backend_server}:80/{url}", host: "{domain}", referrer: "{referrer}" Any suggestions how to debug such errors. I am unable to find a munin plugin to keep a check on number of upstream errors. Sometime the number of errors per day is way too high and somedays its a more decent 3 digit number. A munin graph would probably help us finding out any pattern or correlation with anything else How can we make the number of such error as ZERO

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• Does my dd-wrt installation support firewall logging?

  - by SpikeX

  I would like to log firewall events. I know this is possible with dd-wrt, but a lot of the documentation I've read states that this isn't possible with a micro installation of dd-wrt (based on BusyBox). I have a Netgear WNDR3700v2 router, and it does have BusyBox installed on it, but I don't know if the dd-wrt build is a micro build or not. How can I find this out, or how can I find out if my router supports firewall logging or not? Currently, if I enable all firewall logging (setting everything to "Enabled" and/or "High" gives me back blank firewall logs - but syslogd is working because I can view other system log messages).

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• Options not available anymore in my Samsung 932bw lcd

  - by Sávio Mendes

  I think a friend messed up something in my monitor. I left him playing a game and when i came back, i noticed that the brightness was very high. I tried to change it but i couldn't, brithness, contrast, color warm and a few other options are marked as "not available" (he probably adjusted the brightness and changed something else too, that it's causing this thing). I updated the monitor driver, the vcard driver, plugged the monitor in other pc (I'm connected through dvi, but in the other pc i plugged through rgb) but nothing fixed it. Is there someway to force reset all the options or something like that to fix this? (I'm running Win7 RC1 but I don't think that it has something to do with it, it was working perfectly until he messed it up, and the other pc where I plugged it, runs winxp and the problem occurs too. And it doens't look like a the monitor is broken, it works like it always did, just these options are marked "not available" now...)

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• svnrepo + trac hosting

  - by Shikhar

  Does anyone know of a good and economic svn + trac hosting site. Specific requirements 1) trac hooks should be in place, which enables commmit messages to be updated in trac issues. 2) It should have emailTotracScript or MailToTracPlugin installed, with which an issue can be reported via email. If its located in Asia pacific it would be great, as time delay from the US is very high. I am already using sourcerepo.com and its very good. Only short coming is they dont have emailtotrac and the time delay is significant. any other inputs would be helpful. TIA

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• Why no Win16 support in 64-bit Windows?

  - by dsimcha

  My understanding (from Wikipedia) is that the x64 instruction set supports executing 16-bit protected mode code from long mode, but cannot execute real mode code without being switched out of long mode because long mode lacks virtual 8086 mode. Therefore, it stands to reason that real mode DOS apps can't be run in Win64 w/o software emulation or dynamic translation. However, why was support for Win16 protected-mode apps excluded when support for them seems (at least at first glance) to be reasonably implementable and is included in newer versions of Win32? Was it just a matter of demand not being high enough to justify implementation costs (and the win32 version was already implemented), or is there a good technical reason?

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• Is it possible to do a web search filtered for the user's comprehension level? [migrated]

  - by Tim

  Do any of the major search engines support a filter to indicate the comprehension level of the user and thus to filter out content beyond their scope? So for example, if someone wanted to find results on "astronomy", but to only show content appropriate for someone in junior-high or lower. Alternatively, if there isn't such an existing method directly, any ideas on how this might be accomplished with existing tools? I found this paper, which seems to indicate folks have looked at this, just don't know if there is a real world tool to do this.

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• How to find malicious IPs?

  - by alfish

  Cacti shows irregular and pretty steady high bandwidth to my server (40x the normal) so I guess the server is udnder some sort of DDoS attack. The incoming bandwidth has not paralyzed my server, but of course consuming the bandwidth and affects performance so I am keen to figure out the possible culprits IPs add them to my deny list or otherwise counter them. When I run: netstat -ntu | awk '{print $5}' | cut -d: -f1 | sort | uniq -c | sort -n I get a long list of IPs with up to 400 connections each. I checked the most numerous occurring IPs but they come from my CDN. So I am wondering what is the best way to help monitor the requests that each IP make in order to pinpoint the malicious ones. I am using Ubuntu server. Thanks

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• Creating a seperate static content site for IIS7 and MVC

  - by JK01

  With reference to this serverfault blog post: A Few Speed Improvements where it talks about how static content for stackexchange is served from a separate cookieless domain... How would someone go about doing this on IIS7.5 for a ASP.NET MVC site? The plan so far: Register domain eg static.com, create a new website in IIS Manually copy the js / css / images folders from MVC as is so that they have the same paths on the new server Enable IIS gzip settings (js/css = high compression, images = none) Set caching with far future expiry dates <clientCache cacheControlCustom="public" /> in the web.config Never set any cookies on the static.com site Combine and minimize js / css Auto deploy changes in static content with WebDeploy Is this plan correct? And how can you use WebDeploy to deploy the whole web app to one server and then only the static items to another? I can see there is a similar question, but for apache: Creating a cookie-free domain to serve static content so it doesn't apply

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• Esxi with iSCSI SAN slows down with many multiple VMs running

  - by varesa

  I have a server with ESXi 5 and iSCSI attached network storage(4x1Tb Raid-Z on freenas). Those two machines are connected to each other with Gigabit ethernet, and a procurve switch in between. After a while, if I have many(4-5 or more) vms running, they start to get un-responsive (long delays before anything happens). We are trying to find the reason behind this. Today we looked at esxtop, and found that DAVG of that iSCSI LUN stays at 70-80. I read that +30 is critical! What could be causing those high response-times?

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• video card for only watching videos

  - by Nothing 2 Lose

  I recently quit gaming so I took out my (GeForce GTX 550 Ti) video card and switched back to the (cheap) integrated card because I don't want the dedicated card using up power & making unnecessary heat/noise. But now I get lag when I watch high-res movies, or when I open several videos at the same time, but I don't want to go back to my (big/expensive) video card because that seems like overkill. What is the smallest/cheapest card which will only be good enough for watching videos without lagging ? (but not for gaming) PS. My CPU is: AMD Phenom 9850 Quad-Core Processor

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• TCP 30 small packets per second flood connection with server

  - by Denis Ermolin

  I'm testing connection with flash client and cloud server(boost::asio for software) over TCP connection. My connection with server already is really poor - 120 ms ping in average. I found when i start to send packets with 2 bytes size (without tcp header) with speed 30 packets/s - ping grow to 170-200 average. I think that it's really bad and my bad connection and bad cloud provider is reason for this high ping without any load. What do you think? (I tested my software - it can compute about 50k small packets/s so software is not a problem). I measure my ping through flash client - send packet with timestamp and immediatly send from server to client.

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• Configuring bridged network connection --- Windows 7 host, Ubuntu 10.04 guest --- VMWare Workstation 8

  - by H3br3wHamm3r81

  Here is my IPCONFIG /ALL from the host (Windows 7 64-bit): Here is my IFCONFIG from the guest (Ubuntu 10.04): To be honest, I don't have experience configuring a network between a host and a guest in VMWare (a virtual machine). I've searched high and low on the internet, but I haven't seen anything that can help. Perhaps I'm just not using the right keywords when I search. Nevertheless, does anyone here have any experience with establishing a network connection? Edit: One important note. I don't use DHCP to provide private addresses to the hosts on my LAN. I use "static" IP addresses on my internal network by configuring each IP address manually in the host's network configuration utility (I have TV's, XBOX 360, and a few PC's). I would like to configure the IP on the virtual machine guest manually as well. The reason is because my XBOX 360 only works properly using a static IP address. It will kick me off XBOX Live if it has one given by the router (via DHCP).

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• gunzip unexpected end of file

  - by Mark J Seger

  I like to write high volume data directly to a zip file via perl. Works like a champ! However, on some rare occasions I've found that gunzip can't uncompress them declaring an unexpected end-of-file. The thing is I can uncompress it with a simple perl script, which probably misses the corrupted record(s) at the end. My question is, does anyone know of a way to use a standard utility to do the same thing? Maybe with a 'compress-as-much-as-you-can' switch? -mark

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• Sound card problem, no audio device detected

  - by Paul

  I bought a new sound card because my built in sound card did not function. When I open YouTube, Media Player or anything that can create a sound my computer will hang up and sometimes when I start my computer it will hang when the Windows XP sound will activate. Update: My computer has no audio. It says NO AUDIO DEVICE. I already installed Realtek AC97 and Realtek High Definition Audio Driver and I also pasted stream.dll to the Windows and system32 folders and I restarted my computer but it still says NO AUDIO DEVICE. Please help me. Thanks

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• What is a good solution for an intranet video portal (YouTube-like) site? [closed]

  - by Ken Pespisa

  I would like an easy-to-setup site to handle videos to be viewed internally by my company. YouTube is essentially the perfect solution except for its being public. I'm looking for a place where a few people can upload videos, and the system will return a page where they can watch that video in a browser. I figure this would involve a dedicated Web server to run the Web application and process the videos. I've searched and I don't think such a system exists, but I perhaps there's one out there in its infancy that doesn't rank high on Google yet. Essentially the site I'm looking for is what MediaWiki is to Wikis, or what StackExchange is to Q&A sites, but for videos.

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• Sending a large number of mails causing problems on CentOS 6 / Plesk 10

  - by papakost

  I have a VPS running CentOS 6. When the system tries to send daily newsletter, after some time (e.g. after sending about 2000 emails), I get error "Unable to send mail" and the system memory goes really high. Till this moment, the mails are delivered normally. The rest symptoms are: I cannot see anything on /var/log/maillog (File seems not to be written) All files on /var/spool/mail have 0 bytes size. From time to time on httpd log I get errors like: /usr/sbin/sendmail: error while loading shared libraries: libc.so.6: cannot open shared object file: Error 23 "Activate mail service on domain" setting in Plesk is deactivated. Any idea on what's going wrong here?

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• Bsplayer - load audio tracks from external files

  - by torran

  I have a movie file: Video ID : 1 Format : AVC Format/Info : Advanced Video Codec Format profile : [email protected] Format settings, CABAC : Yes Format settings, ReFrames : 5 frames Muxing mode : Container [email protected] Codec ID : V_MPEG4/ISO/AVC Duration : 54mn 13s Bit rate : 3 380 Kbps Nominal bit rate : 3 459 Kbps Width : 1 280 pixels Height : 720 pixels Display aspect ratio : 16:9 Frame rate : 23.976 fps Resolution : 8 bits Colorimetry : 4:2:0 Scan type : Progressive Bits/(Pixel*Frame) : 0.153 Stream size : 1.28 GiB (88%) Writing library : x264 core 88 r1471 1144615 Audio ID : 2 Format : AC-3 Format/Info : Audio Coding 3 Codec ID : A_AC3 Duration : 54mn 16s Bit rate mode : Constant Bit rate : 384 Kbps Channel(s) : 6 channels Channel positions : Front: L C R, Side: L R, LFE Sampling rate : 48.0 KHz Stream size : 149 MiB (10%) and additional audio files in same folder: .mp3 and .ac3. How can I load them with bsplayer? Right click-audio-audio streams is empty. If i open the movie with media players classic I can switch audio files.

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