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• How many reverse proxies (nginx, haproxy) is too many?

  - by Alysum

  I'm setting up a HA (high availability) cluster using nginx, haproxy & apache. I've been reading great things about nginx and haproxy. People tend to choose one or the other but I like both. Haproxy is more flexible for load balancing than nginx's simple round robin (even with the upstream-fair patch). But I'd like to keep nginx for redirecting non-https to https among other things right at the point of entry to the cluster. On the other hand, nginx is a lot faster for serving static contents and would reduce the load on the powerful apache which loves to eat a lot of RAM! Here is my planned setup: Load balancer: nginx listens on port 80/443 and proxy_forwards to haproxy on 8080 on the same server to load balance between the multiple nodes. Nodes: nginx on the node listens to requests coming from haproxy on 8080, if the content is static, serve it. But if it's a backend script (in my case PHP), proxy forward to apache2 on the same node server listenning on a different port number. Technically this setup works but my concerns are whether having the requests going through several proxies is going to slow down requests? Most of the requests will be PHP requests as the backends are services (which means groing from nginx - haproxy - nginx - apache). Thoughts? Cheers

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• TFTP Timing Out on Ubuntu VM

  - by valsidalv

  I'm running a Windows 7 PC with VMware installed which has my Ubuntu (10.04 Lucid Lynx). I recently installed a DHCP server and TFTP (Xinet tftpd) using these instructions. I've mapped a network drive so that my Windows has access to all the files in my VM through a 192.x.x.x IP address. I'm trying to throw some custom firmware onto a router. The router has its own built-in TFTP utility that will download the image. It successfully manages to do everything but it is slow because it writes it to flash memory. There is another method that is much quicker because it writes to RAM directly but it must use the TFTP server in Ubuntu. The issue I'm facing is that the Ubuntu TFTP transfer seems to be timing out. The transfer starts but never goes past ~60%. Here's my /etc/xinetd.d/tftp file (similar to a known working config): service tftp { protocol = udp port = 69 socket_type = dgram wait = yes user = nobody server = /usr/sbin/in.tftpd server_args = -s /home/user/tftp/ disable = no cps = 300 2 per_source = 60 } I've done some searching but can't find any parameters for this file to control timeout time or number of retries. The last two arguments (cps, per_source) and completely alien to me (can anyone explain). I have a few possible solutions but the easiest would be to get this TFTP server working. Can anyone help? Either with a timeout configuration or maybe even recommend a different TFTP server? Thanks!

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• Backing up default windows installation with dd from linux running on another partition - is this fe

  - by Marek

  I am preparing to reinstall my system. I am thinking about creating a multi boot with a linux distro+Windows 7 to choose from when starting up. I would love to be able to skip all the hassle of reinstalling Windows and all programs when it starts becoming too slow in the future, thus I would like to mirror my fresh Windows system partition with some programs preinstalled. I am thinking about installing Ubuntu, making a partition for windows, installing windows with the basic environment (Visual Studio, Office, etc.) then booting into Linux and making an image of the windows partition with dd. I am not familiar with linux at all so I am a little afraid something may go wrong along the way. Is it possible to do it this way? Will I be able to partition my existing disk for multi boot easily after I install Ubuntu? Will I be able to recover the Windows partition easily using dd when I will need to re-create a fresh windows partition in the future? What other (better) approach can you recommend to achieve the goal of easy disk mirroring (for free)?

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• Disable "Do you want to change the color scheme to improve performance?" warning

  - by William Lawn Stewart

  Sometimes this dialog box will pop up (see screenshot below). Every time it appears I select "Keep the current color scheme, and don't show this message again". Windows then reminds me again -- either the next day or after reboot, or sometimes another 5 minutes later. Do you want to change the color scheme to improve performance? Windows has detected your computer's performance is slow. This could be because there are not enough resources to run the Windows Aero color scheme. To improve performance, try changing the color scheme to Windows 7 Basic. Any change you make will be in effect until the next time you log on to Windows Change the color scheme to Windows 7 Basic Keep the current color scheme, but ask me again if my computer continues to perform slowly Keep the current color scheme, and don't show this message again Is there some reason why Windows is ignoring/forgetting my attempts to suppress the dialog? I'd love to never ever see it again, it's annoying, and it alt-tabs me out of fullscreen applications. If it matters, I'm running Windows 7 x64 Professional. I believe the dialog appears because I'm forcing Vsync and Triple Buffering for DirectX applications.

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• Connection problems via Wifi (multiple devices)

  - by Kelvin Farrell

  I'm having connection issues with my router (Linksys WRT610N) at home. There are a number of things that are happening (may be more, this is just what I've mainly noticed)... 1) Using my laptop (Macbook Pro OSX Lion), I am unable to complete any operations with my external FTP server, hosted with FatCow. I can connect to it, navigate through all the files, but when I try to edit/delete/add a file the operation times out. EVERY time. I've used two other Wifi connection on my laptop and neither have this issue. 2) I am unable to upload photos/videos to Facebook or Twitter using my phone (Samsung Galaxy S2) or my tablet (HP Touchpad - CM9). Neither am I able to upload files to Dropbox via either of the devices. Same thing happens in all situations; the upload will begin and it will just hang on 0% forever. After about 10 mins I am always forced to disconnect the Wifi to stop the action. 3) My laptop is having slow internet speed, even though we are on 20mb broadband. Speedtests say I'm getting a good connection and my Ping is good, but when using streaming services like Spotify, it takes forever to load a page and frequently stops to buffer whilst playing a song. Don't know if it's worth mentioning but I have no issues with my XBox (Ethernet), AppleTV (Wifi) or my girlfrield's phone (Nokia Lumia 800 - WP7.5) on the network. I'd really appreciate any help. This is driving me insane and is really affecting both my working and leisure use of the internet.

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• Wireless card on HP laptop not working

  - by D. Strout

  I just bought an HP Envy m6-1125dx online from Best Buy. When I got it home and started it up, the wireless card did not work well - at all. I could connect, but any real usage would cause the connection to start dropping every 30 seconds or so, and it would be really slow. Taking another look at the reviews on the Best Buy site, it seems only a few others had this problem, so I took it to my local Best Buy and exchanged it for another unit. Got it home again and the card had the same issues. Which leads to my dilemma. First: does this model have several different cards that it could come with? Mine is a Ralink RT5390R (on both units I received). If it does, then I can keep exchanging until I get a unit with a different card. I wouldn't ask this, except it seems weird that only a few people mentioned this issue, so I thought that might be one possibility. I looked in to replacing the card with a different one myself, but it seems that HP blocks certain wireless cards. However, some people reported success in replacing the card, and this site said it was only an issue on "older HP computer[s]". Can anyone confirm this? Finally, if that fails/will not work, does anyone know what I can get through Best Buy? I am concerned that they will not put any different card than the Ralink, and after two of those, I don't want that. Can I ask Best Buy support to use a different card? Can they even get another card from HP? I guess the base question is: should I attempt to replace the card myself (two days via Amazon to get a new card), should I try to get the laptop repaired through Best Buy (two - four weeks), should I go for a different model laptop from Best Buy, or should I try a different unit of the same model (three's the charm?).

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• Logitech QuickCam Pro 9000 & Windows 7 64-bit failing miserably

  - by Saxtus

  I am trying to install a Logitech QuickCam Pro 9000 webcam to Windows 7 64-bit. If I do it without using the Logitech drivers but instead the Windows Update ones, the camera works with low frame rate and without face tracking and all other bells and whistles that it's full driver provides. The moment I install the latest official Logitech driver, the problems begin: Camera works fine, until I decide to go to audio settings of the LWS panel or Windows'. Then LWS freezes and with it everything that tries to output audio. I am not able to open Playback/Recording devices window (it just doesn't appear) and system gets unstable and slow with LWS.EXE process not been able to close forcefully. If I reboot and forget the camera connected, this situation continues and system gets unstable from the beginning. If I reboot without the camera connected, everything works fine until I connect it and try to do something with audio settings of Windows or LWS panel. I should note, that until the freezing occurs, camera works as expected, with full frame rate, face tracking and everything that is expected to do. The soundcard is the ASUS SupremeFX II of the ASUS Striker II Extreme motherboard. Any ideas of what is causing this or what else to try so I can make it work as advertised? Thank you.

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• All virtualhosts serving Apache default files

  - by tj111

  I'm trying to configure Apache as an in-network webserver, and am using the sites-available/sites-enabled feature as opposed to just static vhost files. I set up a couple VirtualHosts, all with a unique DocumentRoot, however request for all the VirtualHosts just serve up the "It's Working!" default file. I can't for the life of me figure out why it won't serve the content out of the correct directory. Here's the contents of the virtualhost directive files, let me know if I need to post more. default (note that apache renames this to 000-default in sites-enabled, so it's not an ordering issue) NameVirtualHost *:80 ServerName emp <VirtualHost *:80> ServerAdmin webmaster@localhost ServerName emp DocumentRoot /var/www <Directory /> Options FollowSymLinks AllowOverride None </Directory> <Directory /var/www/> Options Indexes FollowSymLinks MultiViews AllowOverride None Order allow,deny allow from all </Directory> ScriptAlias /cgi-bin/ /usr/lib/cgi-bin/ <Directory "/usr/lib/cgi-bin"> AllowOverride None Options +ExecCGI -MultiViews +SymLinksIfOwnerMatch Order allow,deny Allow from all </Directory> ErrorLog /var/log/apache2/error.log # Possible values include: debug, info, notice, warn, error, crit, # alert, emerg. LogLevel warn CustomLog /var/log/apache2/access.log combined Alias /doc/ "/usr/share/doc/" <Directory "/usr/share/doc/"> Options Indexes MultiViews FollowSymLinks AllowOverride None Order deny,allow Deny from all Allow from 127.0.0.0/255.0.0.0 ::1/128 </Directory> </VirtualHost> billmed <VirtualHost *:80> ServerName billmed.emp ServerRoot /home/empression/Projects/billmed/web/httpdocs <Directory "/home/empression/Projects/billmed/web/httpdocs"> Order Allow,Deny Allow from All </Directory> </VirtualHost> Note that I have DNS zones for both emp and billmed.emp, as well as entries in /etc/hosts. My ultimate goal is to set up this machine as an in-house webserver with a custom tld (emp), but progress has been pretty slow.

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• Nginx : Proper use of limit_req_zone and limit_req

  - by xperator

  I have 2 website running on VPS. Their purpose is sharing music files and publishing news. Both of them use wordpress. What I am trying is that I want to prevent little hackers from flooding the webserver and putting stress on the server to make it crash. The problem is that after using limit_req_zone and limit_req my website became very slow. Browsing Wordpress control panel takes a long long time. I tried changing values but it didn't improve much. I guess the problem is Wordpress because it's the only script I am using on both front and back end. Here is the last setting which seems to be more responsive than others : limit_req_zone $binary_remote_addr zone=flood:5m rate=10r/m; location ~ \.php$ { limit_req zone=flood burst=100 nodelay; } What are the optimal values that should be used in my case (wp) ? I want the website have it's normal behavior, On the other hand stopping lifeless people from flooding. Another question, Is it safe and enough to use limit_req only on php files ?

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• Win7 System folder contains infinitely looping SYSTEM(!) directory

  - by Matt

  My Windows 7 Enterprise computer has been crashing fairly frequently recently, so I decided to boot up in safe mode and run the TrendMicro client I have installed. It froze about 10 minutes into the full system scan, so in the spirit of http://whathaveyoutried.com, I started scanning each folder individually. When I got to ProgramData, the AV failed with an uncaught exception. I then went down a level and tried scanning Application Data, which failed as well. Imagine my surprise when I open the folder just to see the same folder again! As far as I can tell, this folder loop continues indefinitely. (If you are trying to recreate this, keep in mind that ProgramData is a hidden folder.) I'm actually a bit concerned that these are system folders, as this is a brand-new computer with a clean installation. I guess I have three questions: Has anyone else seen/experienced this before? I'm running Win7 SP1. How do I fix this? I've run CHKDSK \F with no success (although it was incredibly slow). What are the ramifications of an infinitely recursive directory? Theoretically speaking, each link takes up memory, so shouldn't I have no space available on my hard drive? (I've got about 180GB left.) I noticed that the tree view on the left only shows the "linked folder" icon on the deeper folders--does this mean anything special? (I've circled the icons or lack thereof in red.) How can the OS even resolve this aberration? And above all, what would happen if I were to select "Expand all folders"??? :P Matt

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• Modify or disable Windows 8 swipe gestures on touchpad / laptop

  - by Matsemann

  I have an ASUS G75VW laptop with a Synaptic touchpad (/trackpad). When I move my finger from one edge towards the middle (the swipe), Windows 8 will bring up different stuff. This is a problem because the area where I can actually move the mouse with my finger is too small (or, I mostly use the top left of the touchpad). So I often end up doing a swipe and bringing up some menu, or to do the swipe so slow that no menu is appearing but the mouse pointer is also not moving when I move my finger. Quite annoying. When swiping from left edge it earlier swapped apps like crazy. I disabled that, so now it only brings up the same menu as pressing win+tab (or some times the charms bar, I never know which). I could change that by: Win+I - Change PC settings - General - When I swipe from the left edge, switch directly to my most recent app I've tried Mouse settings in Control Panel, driver settings for my touchpad and searching for swipe and gestures on my computer (which was what led me to the setting above) with no luck. How can I disable the swipe gestures, or change what they do? Thanks.

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• Can I use a Drobo FS over the internet? -Or alternative?

  - by SeniorShizzle

  I have a lot of files. A HUGE Aperture library, lots of design work from Photoshop, and a rather large iTunes library too. I really want to get a Drobo FS, the networked one, to store all of my stuff on, so that I can get to it from my MacBook Air (which obviously with its minuscule 64GB drive can't hold my Aperture library by itself) and my iMac which is my main powerhouse. The dealbreaker for me is that I NEED to be able to access my Aperture library, and especially my iTunes library from across the internet. I understand that it will probably be slow and everything, but there's nothing else I can do besides hauling around a huge hard drive with me. So, is there any way I can somehow share my Drobo across the internet, on a VPN or something? My other alternative is to upload everything to my web host, FatCow, which offers unlimited disk space (something I hope to make them regret) and then access it using Expandrive. My only thoughts with this are that with the Drobo, any work that I do locally will be much snappier than if I have to work everything off the cloud. Any suggestions about alternatives would also be welcome.

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• Handling the Outlook 2007 AutoArchive PST file

  - by Doug Luxem

  We encourage our users to enable AutoArchive in Outlook 2007 as a way to manage their mailbox sizes. However, we frequently end up running in to problems with the archive.pst file that is generated. The two main problems we have are: The archive.pst file is located in the user's local profile directory and is never backed up. A dead hard drive or stolen laptop could result in months or years of missing email. All other personal data is stored on network shares, but we can't do that for Outlook PST files. Without some sort of manual intervention, the archive will grow to enormous sizes. Although Outlook 2007 SP2 handles the large files better than before, it still results in slow response times from Outlook and an increase likelihood of a corrupt PST file. To mitigate these problems personally, I move the archives to a c:\Outlook folder and manually back that up to a shared drive every month or so. Additionally, I rotate archive files every year so that I have one file for each year (archive2008.pst, etc). Obviously, asking our users to do this same wouldn't help much. We need some sort of automated solution to take care of points 1 and 2. I have to imagine this is a common problem for Exchange organizations, so what is the best method to handle this?

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• mysqld crashes on any statement

  - by ??iu

  I restarted my slave to change configuration settings to skip reverse hostname lookup on connecting and to enable the slow query log. I edited /etc/my.cnf making only these changes, then restarted mysqld with /etc/init.d/mysql restart All appeared to be well but when I connect to msyqld remotely or locally though it connects okay a slight problem is that mysqld crashes whenever you try to issue any kind of statement. The client looks like: Reading table information for completion of table and column names You can turn off this feature to get a quicker startup with -A Welcome to the MySQL monitor. Commands end with ; or \g. Your MySQL connection id is 3 Server version: 5.1.31-1ubuntu2-log Type 'help;' or '\h' for help. Type '\c' to clear the buffer. mysql> show tables; ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... Connection id: 1 Current database: mydb ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... ERROR 2003 (HY000): Can't connect to MySQL server on 'xx.xx.xx.xx' (61) ERROR: Can't connect to the server ERROR 2006 (HY000): MySQL server has gone away No connection. Trying to reconnect... ERROR 2003 (HY000): Can't connect to MySQL server on 'xx.xx.xx.xx' (61) ERROR: Can't connect to the server ERROR 2006 (HY000): MySQL server has gone away Bus error The mysqld error log looks like: 101210 16:35:51 InnoDB: Error: (1500) Couldn't read the MAX(job_id) autoinc value from the index (PRIMARY). 101210 16:35:51 InnoDB: Assertion failure in thread 140245598570832 in file handler/ha_innodb.cc line 2595 InnoDB: Failing assertion: error == DB_SUCCESS InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.1/en/forcing-recovery.html InnoDB: about forcing recovery. 101210 16:35:51 - mysqld got signal 6 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. key_buffer_size=16777216 read_buffer_size=131072 max_used_connections=3 max_threads=600 threads_connected=3 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1328077 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. thd: 0x18209220 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... stack_bottom = 0x7f8d791580d0 thread_stack 0x20000 /usr/sbin/mysqld(my_print_stacktrace+0x29) [0x8b4f89] /usr/sbin/mysqld(handle_segfault+0x383) [0x5f8f03] /lib/libpthread.so.0 [0x7f902a76a080] /lib/libc.so.6(gsignal+0x35) [0x7f90291f8fb5] /lib/libc.so.6(abort+0x183) [0x7f90291fabc3] /usr/sbin/mysqld(ha_innobase::open(char const*, int, unsigned int)+0x41b) [0x781f4b] /usr/sbin/mysqld(handler::ha_open(st_table*, char const*, int, int)+0x3f) [0x6db00f] /usr/sbin/mysqld(open_table_from_share(THD*, st_table_share*, char const*, unsigned int, unsigned int, unsigned int, st_table*, bool)+0x57a) [0x64760a] /usr/sbin/mysqld [0x63f281] /usr/sbin/mysqld(open_table(THD*, TABLE_LIST*, st_mem_root*, bool*, unsigned int)+0x626) [0x641e16] /usr/sbin/mysqld(open_tables(THD*, TABLE_LIST**, unsigned int*, unsigned int)+0x5db) [0x6429cb] /usr/sbin/mysqld(open_normal_and_derived_tables(THD*, TABLE_LIST*, unsigned int)+0x1e) [0x642b0e] /usr/sbin/mysqld(mysqld_list_fields(THD*, TABLE_LIST*, char const*)+0x22) [0x70b292] /usr/sbin/mysqld(dispatch_command(enum_server_command, THD*, char*, unsigned int)+0x146d) [0x60dc1d] /usr/sbin/mysqld(do_command(THD*)+0xe8) [0x60dda8] /usr/sbin/mysqld(handle_one_connection+0x226) [0x601426] /lib/libpthread.so.0 [0x7f902a7623ba] /lib/libc.so.6(clone+0x6d) [0x7f90292abfcd] Trying to get some variables. Some pointers may be invalid and cause the dump to abort... thd->query at 0x18213c70 = thd->thread_id=3 thd->killed=NOT_KILLED The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash. 101210 16:35:51 mysqld_safe Number of processes running now: 0 101210 16:35:51 mysqld_safe mysqld restarted InnoDB: The log sequence number in ibdata files does not match InnoDB: the log sequence number in the ib_logfiles! 101210 16:35:54 InnoDB: Database was not shut down normally! InnoDB: Starting crash recovery. InnoDB: Reading tablespace information from the .ibd files... InnoDB: Restoring possible half-written data pages from the doublewrite InnoDB: buffer... 101210 16:35:56 InnoDB: Started; log sequence number 456 143528628 101210 16:35:56 [Warning] 'user' entry 'root@PSDB102' ignored in --skip-name-resolve mode. 101210 16:35:56 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname changed!! Please use '--relay-log=mysqld-relay-bin' to avoid this problem. 101210 16:35:56 [Note] Event Scheduler: Loaded 0 events 101210 16:35:56 [Note] /usr/sbin/mysqld: ready for connections. Version: '5.1.31-1ubuntu2-log' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu) 101210 16:36:11 InnoDB: Error: (1500) Couldn't read the MAX(job_id) autoinc value from the index (PRIMARY). 101210 16:36:11 InnoDB: Assertion failure in thread 139955151501648 in file handler/ha_innodb.cc line 2595 InnoDB: Failing assertion: error == DB_SUCCESS InnoDB: We intentionally generate a memory trap. InnoDB: Submit a detailed bug report to http://bugs.mysql.com. InnoDB: If you get repeated assertion failures or crashes, even InnoDB: immediately after the mysqld startup, there may be InnoDB: corruption in the InnoDB tablespace. Please refer to InnoDB: http://dev.mysql.com/doc/refman/5.1/en/forcing-recovery.html InnoDB: about forcing recovery. 101210 16:36:11 - mysqld got signal 6 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. key_buffer_size=16777216 read_buffer_size=131072 max_used_connections=1 max_threads=600 threads_connected=1 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1328077 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. thd: 0x18588720 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... stack_bottom = 0x7f49d916f0d0 thread_stack 0x20000 /usr/sbin/mysqld(my_print_stacktrace+0x29) [0x8b4f89] /usr/sbin/mysqld(handle_segfault+0x383) [0x5f8f03] /lib/libpthread.so.0 [0x7f4c8a73f080] /lib/libc.so.6(gsignal+0x35) [0x7f4c891cdfb5] /lib/libc.so.6(abort+0x183) [0x7f4c891cfbc3] /usr/sbin/mysqld(ha_innobase::open(char const*, int, unsigned int)+0x41b) [0x781f4b] /usr/sbin/mysqld(handler::ha_open(st_table*, char const*, int, int)+0x3f) [0x6db00f] /usr/sbin/mysqld(open_table_from_share(THD*, st_table_share*, char const*, unsigned int, unsigned int, unsigned int, st_table*, bool)+0x57a) [0x64760a] /usr/sbin/mysqld [0x63f281] /usr/sbin/mysqld(open_table(THD*, TABLE_LIST*, st_mem_root*, bool*, unsigned int)+0x626) [0x641e16] /usr/sbin/mysqld(open_tables(THD*, TABLE_LIST**, unsigned int*, unsigned int)+0x5db) [0x6429cb] /usr/sbin/mysqld(open_normal_and_derived_tables(THD*, TABLE_LIST*, unsigned int)+0x1e) [0x642b0e] /usr/sbin/mysqld(mysqld_list_fields(THD*, TABLE_LIST*, char const*)+0x22) [0x70b292] /usr/sbin/mysqld(dispatch_command(enum_server_command, THD*, char*, unsigned int)+0x146d) [0x60dc1d] /usr/sbin/mysqld(do_command(THD*)+0xe8) [0x60dda8] /usr/sbin/mysqld(handle_one_connection+0x226) [0x601426] /lib/libpthread.so.0 [0x7f4c8a7373ba] /lib/libc.so.6(clone+0x6d) [0x7f4c89280fcd] Trying to get some variables. Some pointers may be invalid and cause the dump to abort... thd->query at 0x18599950 = thd->thread_id=1 thd->killed=NOT_KILLED The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash. 101210 16:36:11 mysqld_safe Number of processes running now: 0 101210 16:36:11 mysqld_safe mysqld restarted The config is [mysqld_safe] socket = /var/run/mysqld/mysqld.sock nice = 0 [mysqld] innodb_file_per_table innodb_buffer_pool_size=10G innodb_log_buffer_size=4M innodb_flush_log_at_trx_commit=2 innodb_thread_concurrency=8 skip-slave-start server-id=3 # # * IMPORTANT # If you make changes to these settings and your system uses apparmor, you may # also need to also adjust /etc/apparmor.d/usr.sbin.mysqld. # user = mysql pid-file = /var/run/mysqld/mysqld.pid socket = /var/run/mysqld/mysqld.sock port = 3306 basedir = /usr datadir = /DB2/mysql tmpdir = /tmp skip-external-locking # # Instead of skip-networking the default is now to listen only on # localhost which is more compatible and is not less secure. #bind-address = 127.0.0.1 # # * Fine Tuning # key_buffer = 16M max_allowed_packet = 16M thread_stack = 128K thread_cache_size = 8 # This replaces the startup script and checks MyISAM tables if needed # the first time they are touched myisam-recover = BACKUP max_connections = 600 #table_cache = 64 #thread_concurrency = 10 # # * Query Cache Configuration # query_cache_limit = 1M query_cache_size = 32M # skip-federated slow-query-log skip-name-resolve Update: I followed the instructions as per http://dev.mysql.com/doc/refman/5.1/en/forcing-innodb-recovery.html and set innodb_force_recovery = 4 and the logs are showing a different error but the behavior is still the same: 101210 19:14:15 mysqld_safe mysqld restarted 101210 19:14:19 InnoDB: Started; log sequence number 456 143528628 InnoDB: !!! innodb_force_recovery is set to 4 !!! 101210 19:14:19 [Warning] 'user' entry 'root@PSDB102' ignored in --skip-name-resolve mode. 101210 19:14:19 [Warning] Neither --relay-log nor --relay-log-index were used; so replication may break when this MySQL server acts as a slave and has his hostname changed!! Please use '--relay-log=mysqld-relay-bin' to avoid this problem. 101210 19:14:19 [Note] Event Scheduler: Loaded 0 events 101210 19:14:19 [Note] /usr/sbin/mysqld: ready for connections. Version: '5.1.31-1ubuntu2-log' socket: '/var/run/mysqld/mysqld.sock' port: 3306 (Ubuntu) 101210 19:14:32 InnoDB: error: space object of table mydb/__twitter_friend, InnoDB: space id 1602 did not exist in memory. Retrying an open. 101210 19:14:32 InnoDB: error: space object of table mydb/access_request, InnoDB: space id 1318 did not exist in memory. Retrying an open. 101210 19:14:32 InnoDB: error: space object of table mydb/activity, InnoDB: space id 1595 did not exist in memory. Retrying an open. 101210 19:14:32 - mysqld got signal 11 ; This could be because you hit a bug. It is also possible that this binary or one of the libraries it was linked against is corrupt, improperly built, or misconfigured. This error can also be caused by malfunctioning hardware. We will try our best to scrape up some info that will hopefully help diagnose the problem, but since we have already crashed, something is definitely wrong and this may fail. key_buffer_size=16777216 read_buffer_size=131072 max_used_connections=1 max_threads=600 threads_connected=1 It is possible that mysqld could use up to key_buffer_size + (read_buffer_size + sort_buffer_size)*max_threads = 1328077 K bytes of memory Hope that's ok; if not, decrease some variables in the equation. thd: 0x1753c070 Attempting backtrace. You can use the following information to find out where mysqld died. If you see no messages after this, something went terribly wrong... stack_bottom = 0x7f7a0b5800d0 thread_stack 0x20000 /usr/sbin/mysqld(my_print_stacktrace+0x29) [0x8b4f89] /usr/sbin/mysqld(handle_segfault+0x383) [0x5f8f03] /lib/libpthread.so.0 [0x7f7cbc350080] /usr/sbin/mysqld(ha_innobase::innobase_get_index(unsigned int)+0x46) [0x77c516] /usr/sbin/mysqld(ha_innobase::innobase_initialize_autoinc()+0x40) [0x77c640] /usr/sbin/mysqld(ha_innobase::open(char const*, int, unsigned int)+0x3f3) [0x781f23] /usr/sbin/mysqld(handler::ha_open(st_table*, char const*, int, int)+0x3f) [0x6db00f] /usr/sbin/mysqld(open_table_from_share(THD*, st_table_share*, char const*, unsigned int, unsigned int, unsigned int, st_table*, bool)+0x57a) [0x64760a] /usr/sbin/mysqld [0x63f281] /usr/sbin/mysqld(open_table(THD*, TABLE_LIST*, st_mem_root*, bool*, unsigned int)+0x626) [0x641e16] /usr/sbin/mysqld(open_tables(THD*, TABLE_LIST**, unsigned int*, unsigned int)+0x5db) [0x6429cb] /usr/sbin/mysqld(open_normal_and_derived_tables(THD*, TABLE_LIST*, unsigned int)+0x1e) [0x642b0e] /usr/sbin/mysqld(mysqld_list_fields(THD*, TABLE_LIST*, char const*)+0x22) [0x70b292] /usr/sbin/mysqld(dispatch_command(enum_server_command, THD*, char*, unsigned int)+0x146d) [0x60dc1d] /usr/sbin/mysqld(do_command(THD*)+0xe8) [0x60dda8] /usr/sbin/mysqld(handle_one_connection+0x226) [0x601426] /lib/libpthread.so.0 [0x7f7cbc3483ba] /lib/libc.so.6(clone+0x6d) [0x7f7cbae91fcd] Trying to get some variables. Some pointers may be invalid and cause the dump to abort... thd->query at 0x1754d690 = thd->thread_id=1 thd->killed=NOT_KILLED The manual page at http://dev.mysql.com/doc/mysql/en/crashing.html contains information that should help you find out what is causing the crash.

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• My home box as my own host?

  - by Majid

  Hi all, I have a 512 kb/s DSL service at home. I do not have a static IP but I can get one if I pay some extra to my ISP. Now, if I get the static IP, can I make my home box act as my internet host? What else do I need? Thanks P.S. I know that if at all possible, the site I make available this way might be slow, that is alright, my question is if it is possible at all. Edit: I need this for very small traffic. I am a php developer and for my projects I am often asked to provide a demo. I currently use a free hosting for this purpose but it is down most of the time and support is non-existent. So I thought to set-up my home computer as my test server. With this please note that: I will only occasionally have 'visitors' and that will be one or possibly two visitors at any time. These demos, are to showcase functionality, so no big images are served and page views will normally generate under 100KB of traffic.

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• Understanding tcptraceroute versus http response

  - by kojiro

  I'm debugging a web server that has a very high wait time before responding. The server itself is quite fast and has no load, so I strongly suspect a network problem. Basically, I make a web request: wget -O/dev/null http://hostname/ --2013-10-18 11:03:08-- http://hostname/ Resolving hostname... 10.9.211.129 Connecting to hostname|10.9.211.129|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: ‘/dev/null’ 2013-10-18 11:04:11 (88.0 KB/s) - ‘/dev/null’ saved [13641] So you see it took about a minute to give me the page, but it does give it to me with a 200 response. So I try a tcptraceroute to see what's up: $ sudo tcptraceroute hostname 80 Password: Selected device en2, address 192.168.113.74, port 54699 for outgoing packets Tracing the path to hostname (10.9.211.129) on TCP port 80 (http), 30 hops max 1 192.168.113.1 0.842 ms 2.216 ms 2.130 ms 2 10.141.12.77 0.707 ms 0.767 ms 0.738 ms 3 10.141.12.33 1.227 ms 1.012 ms 1.120 ms 4 10.141.3.107 0.372 ms 0.305 ms 0.368 ms 5 12.112.4.41 6.688 ms 6.514 ms 6.467 ms 6 cr84.phlpa.ip.att.net (12.122.107.214) 19.892 ms 18.814 ms 15.804 ms 7 cr2.phlpa.ip.att.net (12.122.107.117) 17.554 ms 15.693 ms 16.122 ms 8 cr1.wswdc.ip.att.net (12.122.4.54) 15.838 ms 15.353 ms 15.511 ms 9 cr83.wswdc.ip.att.net (12.123.10.110) 17.451 ms 15.183 ms 16.198 ms 10 12.84.5.93 9.982 ms 9.817 ms 9.784 ms 11 12.84.5.94 14.587 ms 14.301 ms 14.238 ms 12 10.141.3.209 13.870 ms 13.845 ms 13.696 ms 13 * * * … 30 * * * I tried it again with 100 hops, just to be sure – the packets never get there. So how is it that the server does respond to requests via http, even after a minute? Shouldn't all requests just die? I'm not sure how to proceed debugging why this server is slow (as opposed to why it responds at all).

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• Small TCP Window on WAN between 2 Locations

  - by Brent

  Site A: Denver datacenter. 60MBPS. Site B: Chicago. 100MBPS. ICMP pings: Packets: Sent = 176, Received = 176, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 74ms, Maximum = 94ms, Average = 75ms File transfer between sites that never goes past ~7MBPS: Windows Update download at 60MBPS+: Site to site: IPSec VPN using two Cisco 5520's. CPU at 3-4% and lots of memory to spare. The latency between to two sites is very acceptable so I can't see an issue why it is performing so slow when transferring between the two sites. I have found that any type of transfer (FTP, HTTP, Windows file shares) will never go above ~7MBPS. When the WAN was first setup, I was able to get transfers at 50-60MBPS, which is what is expected due to the WAN connection at the Site A at 60MBPS. Then a few days later, I was not able to get anything going faster than ~7MBPS. Is there a upstream router between Denver and Chicago causing this? I want to take the blame away from our setup as downloads from Windows Update go blazing fast and for the first few days after the site to site VPN came up, I was transferring VM images at 50-60MBPS. Our stack: HP P2000 MSA - HP C7000 Chassis - HP Flex-10 - Cisco Gigabit switch - Cisco ASA - WAN

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• Adding users to Sharepoint when they are not in the same domain

  - by jim-work

  Bear with me as I explain this, I'm working my way through Sharepoint access as I go, but I'll clarify my question as I go along. The Problem We have about 10,000 users who need access to our Sharepoint 2005 based reporting. Because our organization is migrating from one domain to another, we need to add each user twice, once for each domain. For the current domain, this is no problem, we've got a powershell script that I tweaked to add all the users in a given CSV file, this takes about 5 minutes to run. The big problem we're having is with users who are NOT in our currently active domain. Because the sharepoint server cannot authenticate the new users, we can't add them directly. What we're doing is creating a temp user, then using STSADM.EXE to migrate that test user to the proper domain/user_name for each of our 10,000 users. The creation and migration takes about 5 seconds per user, or well over 12 hours to run. The Question Has anyone encountered this before? Is there a way to add users without requiring AD authentication? Why is STSADM.EXE running so slow? Thanks a lot for any advice or direction anyone can give me.

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• How to interrupt software raid resync?

  - by Adam5

  I want to interrupt a running resync operation on a debian squeeze software raid. (This is the regular scheduled compare resync. The raid array is still clean in such a case. Do not confuse this with a rebuild after a disk failed and was replaced.) How to stop this scheduled resync operation while it is running? Another raid array is "resync pending", because they all get checked on the same day (sunday night) one after another. I want a complete stop of this sunday night resyncing. [Edit: sudo kill -9 1010 doesn't stop it, 1010 is the PID of the md2_resync process] I would also like to know how I can control the intervals between resyncs and the remainig time till the next one. [Edit2: What I did now was to make the resync go very slow, so it does not disturb anymore: sudo sysctl -w dev.raid.speed_limit_max=1000 taken from http://www.cyberciti.biz/tips/linux-raid-increase-resync-rebuild-speed.html During the night I will set it back to a high value, so the resync can terminate. This workaround is fine for most situations, nonetheless it would be interesting to know if what I asked is possible. For example it does not seem to be possible to grow an array, while it is resyncing or resyncing "pending"]

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• heavy load on mysql

  - by payal

  i have dedicated server with very good configuation like 16 gb ram etc but i am facing heavy load from mysql however only one database is running and 5-10 pages are only running. However whm load is always less than one but when i click on whm load it shows 20% of cpu usage by mysql and after some time it starts saying can not connect to mysql . mysql server has gone away 1691 (Trace) (Kill) mysql 0 19.2 2.7 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log- error=/var/lib/mysql/server.xyz.com.err --pid-file=/var/lib/mysql/server.xyz.com.pid i have tested static pages they are coming blezing fast but all dynamic pages which are using mysql is coming damn slow it takes years to open.. ihave checked log error file it says nothing.i have increased maximum connnection also to 1000 but still same problem is there .if i disconnect that one databasejust by changing the name of database i can see withing half hour the load of server and mysql goes down to negliglble .i have tested everything and if there are some query which can cause heavy load to server can you please list which type of query can cause heavy load on server then also for 5-10 pages it will never cause that much heavy load. i have seen server with 500 websites but was working just fine.

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• heavy load on mysql

  - by payal

  i have dedicated server with very good configuation like 16 gb ram etc but i am facing heavy load from mysql i am running a music wesbite however only one database is running and 5-10 pages are only running.when i click on whm show processlist it shows only 2-3 processes However whm load is always less than one but when i click on whm load it shows 20% of cpu usage by mysql and after some time it starts saying can not connect to mysql . mysql server has gone away 1691 (Trace) (Kill) mysql 0 19.2 2.7 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=mysql --log- error=/var/lib/mysql/server.xyz.com.err --pid-file=/var/lib/mysql/server.xyz.com.pid i have tested static pages they are coming blezing fast but all dynamic pages which are using mysql is coming damn slow it takes years to open.. my.conf file is [mysqld] key_buffer = 1536M max_allowed_packet = 1M max_connections = 250 max_user_connections = 15 wait_timeout=40 connect_timeout=10 table_cache = 512 sort_buffer_size = 2M read_buffer_size = 2M read_rnd_buffer_size = 8M myisam_sort_buffer_size = 64M thread_cache_size = 8 query_cache_size = 32M server-id = 14 old-passwords = 1 [mysqldump] quick max_allowed_packet = 16M [mysql] no-auto-rehash [myisamchk] key_buffer = 256M sort_buffer_size = 256M read_buffer = 2M write_buffer = 2M [mysqlhotcopy] interactive-timeout ihave checked log error file it says nothing.i have increased maximum connnection also to 1000 but still same problem is there .if i disconnect that one databasejust by changing the name of database i can see withing half hour the load of server and mysql goes down to negliglble .i have tested everything and if there are some query which can cause heavy load to server can you please list which type of query can cause heavy load on server then also for 5-10 pages it will never cause that much heavy load. i have seen server with 500 websites but was working just fine.

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• Windows 7 hangs after going into sleep a second time

  - by Brian Stephenson

  I've searched everywhere around Google and can't figure out why this is happening so I decide to ask here to see if anyone has a problem like this. Like it says in the title, whenever I sleep ONCE I'm able to wake the system, but going back to sleep again AFTER waking up for the first time results in it hanging on no input and no output, with the fan spinning as fast as possible and alot of heat being spewed out by the fan as well. I've tried various things like setting all USB Hub Root's to not get switched off for power saving, disabling USB selective suspend, disabling PCI-e link state power management, and even unplugging ALL USB devices and it wont wake up after the second attempt. And I've even waited up to a full hour of the CPU fan spinning loudly and it's still stuck trying to wake up. The only USB devices I use are a Microsoft USB Comfort Curve Keyboard 2000 (IntelliType Pro) and a generic HID compliant mouse from Creative model number OMC90S "CREATIVE MOUSE OPTICAL LITE". My other devices like external drives and controllers are unplugged when I'm not using them as having too many USB devices plugged in at a time causes a deadlock on almost all of the ports I have. Here's my system specifications (Most of these are from CPU-Z): Brand: Gateway DX4300-19 Mainboard: Gateway RS780 Chipset: AMD 780G Rev 00 Southbridge: AMD SB700 Rev 00 LPCIO: ITE IT8718 BIOS: American Megatrends Inc. ver P01-A4 09/15/2009 CPU: AMD Phenom II X4 810 at 2.60 GHz RAM: 8.0 GB DDR2 Dual Channel Ganged Mode at 400 MHz GPU: ATI Radeon HD3200 Graphics Intergrated - RS780 OS: Windows 7 Home Premium x64 OEM (Acer Group) HDD: WDC WD10EADS-22M2B0 1.0 TB (Western Digital Green Caviar) My BIOS has absolutely no control over how I setup the sleep mode to be either S1 or S3. So I can't check these settings or even change them. Hybrid sleep is also disabled, I can successfully go into hibernation and wake from hibernation but this is painfully slow due to a harddrive problem I'm having with this "Green Drive". (Hibernation takes over ~3 minutes to complete) Any help would be appreciated, thanks.

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• 100% CPU load on Ubuntu 10.04.3 LTS 64bit

  - by deadtired

  I have 2 days since I am trying to fix this issue, with no success. The server is a mysql database server. Hardware: DELL Poweredge 1950, 2x Intel Xeon Quad Core E5345 @ 2.33GHz, 16 Gb mem, 2x 146Gb SAS (software RAID1) Software: Ubuntu 10.04.3 LTS, MySQL 5.1.41 Issue: while mysql is not used and runs with no database, everything seems alright. As soon as I install a database, it has the reason to bring all 8 cores in 100% with low memory consumption. So, you can imagine the load average goes high (I saw 212 load average for the first time). The server doesn't become unresponsive, but you can see it's slow while browsing the project installed. Additional info: the database used is not more than 24MB and it was moved from a server with less resources and a lot more larger databases. So it's not the database/project. my.cnf is not a reason also, as I used both default one and the one I use on the same distribution on another server.What is interesting is that mysql doesn't close any process and runs to the limit of the max_connections. Logs are quiet. Nothing there. I switched to this Ubuntu version after I suspected some problems in the newly Ubuntu 11.10 server. This one worked alright for an hour after I made a kernel upgrade to 3.0.1 (it was using the memory also) I tested disk speed and seems alright. Some more output on the running server: dstat -cndymlp -N total -D total 3: htop command: Idea? Did anyone meet the same problem? Any fix you can think of?

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• Good references to know why has my computers stopped responding me

  - by Peterstone

  Hello all! I´m a windows xp user (but not for much time...) and I usually see how my computer stop of responding me. The process is this: Firsly it became totally stopped or very slow for certain periods of 5 minutes. How could I do? After that it gets stopped (Even not totally because If I click on the bar I see a blinking response in the bar botton of the program I click on. It´s could be anything related with security (like the firewall or some virus)? Computer university: I usually experience this, using Matlab (R2007a) with System Generator (its respective compatible version) My personal laptop: It´s usually works well but when stopped periods became to appears I know in not much time it will became totally stopped. I usually see how Word 2007 get stopped and after a while my windows xp gets stopped. (well I can access to the the manage task pressing ctr+alt and...). The only solution I see is to kill program by program... My petition: Please, I need good references that help me how to think in order to avoid or to manage the problems previously described. Does anyone know usefull books or articles? EDIT: Laptop: OS: XP Home Edition Version 2002 SP3 Hardware: HP Mini Intel(R)Atom(TM) CPU N270 @1,60GHz 1.99 GB RAM University Computer: OS: XP Profesional SP3 Hardware: AMD Athlon(tm) XP 1800+ 1.54 GHz, 768 MB RAM

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• What Is The Proper Laptop Battery Care While Running Laptop Solely On Battery?

  - by Boris_yo

  Because of convenience, I had to move my laptop to another room away from room where I always ran laptop on UPS without using battery. Since so far I always run laptop on battery, I question the proper usage to prolong battery life. Currently I run laptop on battery with power supply so battery is constantly being charged until it is full 100% and when it is, I disconnect power supply and continue working until battery meter shows 10% remaining. That's when I plug in power supply and let it charge until 100% once again while I work. But it takes a lot of time to fully charge laptop while working since my power supply is 60W which should be the reason of such slow charge and I think the kind of charger that I use is express charger. The thought of charging laptop until full, all while doing my work makes me think that if it takes way more time to charge, it might keep battery running warm for the period of charging time which brings me to question about whether I should keep running laptop as I've described above or it would be better to leave power supply constantly connected to laptop to keep battery between 99%-100%? On one hand it won't keep battery warm but it will try to frequently supply charge to battery once it gets 99% to replenish charge to 100% (which might reduce battery life?). On the other hand if I'll keep working solely on battery and recharge it when below 10%, the battery will get warm but only when charged. Can anybody suggest the correct way of running laptop on battery to ensure better battery life? Dell Latitude E6420 Windows 7 64-bit

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