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• Setting up a home server - what to use? (ZFS vs btrfs, BSD vs Linux, misc other requirements)

  - by monch1962

  I need to get all our home content off individual machines and onto a central server. What I'd like to have is the metaphorical "server under the stairs". Stuff we need: expandable storage. I want to be able to add extra disc as we go along, with minimal maintenance required. Currently we've got about 3Tb of files we need to host, and that's likely to grow by another Tb every 6-12 months based on recent history. I need to be able to add additional disc with minimal pain needs to store all the media (i.e. photos, video, music) we have, and run services to serve the various devices we have in the house to playback (e.g. DAAP so we can play stuff through iTunes, ccxstream so we can play stuff over XBMC). DAAP and ccxstream are needed now, but we also need to support new standards as they emerge (so a closed-box solution isn't going to work) RAID 5, or something broadly equivalent (e.g. RAID-Z) BitTorrent client ssh, NFS, Samba access snapshot capability (as in ZFS), so we can snapshot individual file systems regularly and rollback when my kids delete their school assignments the day before they're due... ability to recover quickly from power outages (it's not unusual for us to have power outages that last longer than our UPS' batteries) FOSS software a modern distributed version control system running on the box, such as Mercurial Stuff I'd like to have on the server, but can live without: PVR capability, so I could record TV to the box Web server. We currently run a small Web server on a very old box, and I'd ideally like to turn the old box off and move the content to the new server just to save some electricity Nagios + mrtg I've been looking at using a EEE Box as the server, primarily because I can get them cheap and they don't consume much power. The choice of OS and file system is more difficult, from what I've found: I've got most experience with various Linux distros, but am happy to use another Unix FreeBSD and OpenSolaris seem to be the best choices for hosting ZFS OpenSolaris' hardware support is nowhere near as good as e.g. Ubuntu btrfs, while looking very good, doesn't seem ready for prime-time yet ZFS doesn't let you (easily?) add new discs to a RAID5 or RAID-Z reading around, it seems that ZFS is a bit short of tools for recovering lost data At the moment, I'm leaning towards running FreeNAS+ZFS, but I'm concerned about the requirement to be able to add new disc on a fairly regular basis to an existing RAID-Z. Can anyone provide some recommendations, or share experiences? Thanks in advance

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• Core i7 c1e and speedstepping - BSOD on shutdown

  - by DeaconDesperado

  I'm having an interesting problem with my recent Core i7 Digital Audio workstation build that I am curious to see if others have encountered. First, here are the specs on the machine. ASUS P6TD Deluxe Intel X58 Socket LGA1366 MB Intel Core i7-950 3.06Ghz 8M LGA1366 CPU CORSAIR DOMINATOR 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 Western Digital Caviar Black WD5001AALS 500GB Plus a couple ASUS optical drives and a 750W Corsair PSU. Running Windows 7 x64. All this is connected to the nefarious Digi 002 firewire audio interface for use with Pro Tools. I following mostly the specs posted by many other I7 users in the digidesign community who pooled their collective knowledge in this thread. Now after completing my build, I fell victim to the "UD5 squeal" described at that forum thread. So taking the advice posted, I disabled c1e advanced halt state and Intel speed stepping (I would likely have done this anyway to maintain a stable clock, power consumption isn't really a relevant concern on this machine.) I enabled XMP to set the ram timings properly as well. What I am experiencing is a BSOD upon shutdown, but only immediately after windows fully exits and ends all processes. The error is a MACHINE_CHECK_EXCEPTION 0x000000. The funny thing is that it is extremely intermitent and only occurs if the shutdown immediately followed a period of relative idleness. It does not a generate a minidump, I suspect because windows monitoring has terminated by the time this error occurs. No damage is evident and one can simply turn off manually and the system will act as though a proper shutdown had occurred. If anything it is a annoyance, I just want to be certain it is not affecting my long term stability. I have read that the i7 950 does not like DRAM voltages past 1.65, but that they are acceptable if they are within .5 of the BLCK setting. I have tried disabling XMP and setting all timings to auto and the problem still manifests in an identical way. It is suspect that the cpu idleness preceding shutdown is the determining factor, as both c1e and speedstepping are both settings intended to modify handling of this state. Any suggestions or prior experiences would be greatly appreciated. EDIT: The behavior very closely resembles what's described in this thread: http://www.tomshardware.com/forum/12003-63-shut-problem-windows The benign nature of it of is identical. I can't seem to download the hotfix cited there however.

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• Problems migrating an EBS backed instance over AWS Regions

  - by gshankar

  Note: I asked this question on the EC2 forums too but haven't received any love there. Hopefully the ServerFault community will be more awesome. The new AWS Sydney region opening up is something that we've been waiting for for a long time but I'm having a lot of trouble migrating our instances over from N. California. I managed to migrate 1 instance over using CloudyScripts to move a snapshot and then firing up a new instance in the Sydney region. This was a very new instance so both the source and destination were running on a Ubuntu 12.04 LTS server and I had no issues there. However, the rest of our instances are all Ubuntu 10.04 LTS and with these, I'm having a lot of problems. I've tried following: 1- following the AWS whitepaper on moving instances which was given to us at the recent Customer Appreciation Day in Sydney where the new region was launched. The problem with this approach was with the last step (Step 19) here you register the image: ec2-register -s snap-0f62ec3f -n "Wombat" -d "migrated Wombat" --region ap-southeast-2 -a x86_64 --kernel aki-937e2ed6 --block-device-mapping "/dev/sdk=ephemeral0" I keep getting this error: Client.InvalidAMIID.NotFound: The AMI ID 'ami-937e2ed6' does not exist which I think is due to the kernel_id not existing in the Sydney region? 2- Using CloudyScripts to move a snapshot and then creating a new volume and attaching to a new instance in Sydney This results in the instance just hanging on boot and failing the status checks. I can't SSH in or look at the server log I suspect that my issue is with finding the right kernel_id for the volume in the new region. However I can't seem to work out how to go about finding this kernel_id, the ones I've tried (from the original instance) don't result in the Client.InvalidAMIID.NotFound: The AMI ID 'ami-937e2ed6' error and any other kernel_id just won't boot. I've tried both 12.04 and 10.04 versions of Ubuntu. Nothing seems to work, I've been banging my head against a wall for a while now, please help! New (broken) instance i-a1acda9b ami-9b8611a1 aki-31990e0b Source instance i-08a6664e ami-b37e2ef6 aki-937e2ed6 p.s. I also tried following this guide on updating my Ubuntu LTS version to 12.04 before doing the migration but it didn't seem to work either, still getting stuck on updating the kernel_id http://ubuntu-smoser.blogspot.com.au/2010/04/upgrading-ebs-instance.html

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• Hyper-V causes boot loop/failure on a non-Gigabyte Win8 Pro system

  - by Nick

  Hardware: Intel i7 2600K (not overclocked, SLAT compatible, virt. features enabled in bios) Asus Maximus IV Extreme-Z (Z68) 16Gb RAM 256Gb SSD Other non-trivial working parts Adding Hyper-V is causing a boot loop resulting in an attempt at automatic repair by Windows 8 after the second or third loop: I'm trying to get the Windows Phone 8 SDK installed and I've narrowed down my troubles to the Hyper-V feature in Win8. This is required to run the WP8 emulator and there are no install options to omit this feature. My first attempt completely borked the OS as I did not have a recent restore point or system image, so I did a completely clean install and made plenty of backups/restore points. I skipped the SDK install and went straight for the windows feature add-on for Hyper-V. This confirmed that Hyper-V is the issue as the same behavior resulted. I cannot find any hint in the Event Logs. Cancelling automatic recovery causes the same behavior to repeat. I don't have any other VM products installed. My only recourse is to use a restore point, try something else, install it again, and see what happens. No luck so far. I'm on my 10th attempt here. Any help would be much appreciated. EDIT: I found a collection of tips here.. http://social.msdn.microsoft.com/Forums/en-US/wptools/thread/b06cc9f2-aa5e-4cb3-9df1-0c273e1dfd68 So i've been attempting various bios settings to resolve this issue with no luck. I've tried setting 'CPUID Limit' to disabled. This seems to work partly as Win8 boots but no USB devices work at all. I also attempted disabling the usb 3.0 controller as the msdn topic lists an issue with USB controllers on Gigabyte boards. This also doesn't work. The USB devices light up but no input is received by the OS. All of my other bios CPU settings are in line with the info in the post. I'm totally stumped. Bios screenshots: http://i.imgur.com/yKN5u.png http://i.imgur.com/Y9wI4.png http://i.imgur.com/F6EuO.png

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• 500 Internal Server Error when setting up Apache on Ubuntu+Django

  - by ApacheQ

  I tried with Apache on ubuntu 9.04 and get the same error: Internal Server Error The server encountered an internal error or misconfiguration and was unable to complete your request. Please contact the server administrator, webmaster@localhost and inform them of the time the error occurred, and anything you might have done that may have caused the error. More information about this error may be available in the server error log. And my apache/error.log is: [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] ServerName: 'sapint2' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] DocumentRoot: '/etc/apache2/htdocs' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] URI: '/' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Location: '/' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Directory: None [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Filename: '/etc/apache2/htdocs' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] PathInfo: '/' [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] Traceback (most recent call last): [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/lib/python2.7/dist-packages/mod_python/importer.py", line 1537, in HandlerDispatch\n default=default_handler, arg=req, silent=hlist.silent) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/lib/python2.7/dist-packages/mod_python/importer.py", line 1229, in _process_target\n result = _execute_target(config, req, object, arg) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/lib/python2.7/dist-packages/mod_python/importer.py", line 1128, in _execute_target\n result = object(arg) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/modpython.py", line 180, in handler\n return ModPythonHandler()(req) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/modpython.py", line 142, in call\n self.load_middleware() [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py", line 45, in load_middleware\n mod = import_module(mw_module) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/utils/importlib.py", line 35, in import_module\n import(name) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/contrib/sessions/middleware.py", line 4, in \n from django.utils.cache import patch_vary_headers [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/utils/cache.py", line 25, in \n from django.core.cache import get_cache [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/cache/init.py", line 187, in \n cache = get_cache(DEFAULT_CACHE_ALIAS) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/cache/init.py", line 179, in get_cache\n cache = backend_cls(location, params) [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] File "/usr/local/lib/python2.7/dist-packages/django/core/cache/backends/memcached.py", line 139, in init\n "Memcached cache backend requires either the 'memcache' or 'cmemcache' library" [Sat Oct 06 09:32:04 2012] [error] [client 10.0.64.10] InvalidCacheBackendError: Memcached cache backend requires either the 'memcache' or 'cmemcache' library [Sat Oct 06 09:51:30 2012] [notice] caught SIGTERM, shutting down [Sat Oct 06 09:51:31 2012] [notice] mod_python: Creating 8 session mutexes based on 150 max processes and 0 max threads. [Sat Oct 06 09:51:31 2012] [notice] mod_python: using mutex_directory /tmp [Sat Oct 06 09:51:31 2012] [notice] Apache/2.2.17 (Ubuntu) PHP/5.3.5-1ubuntu7.11 with Suhosin-Patch mod_python/3.3.1 Python/2.7.1+ mod_wsgi/3.3 configured -- resuming normal operations I need some help Thanks

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• Trouble using gitweb with nginx

  - by Rayne

  I have a git repository in a directory inside of /home/raynes/pubgit/. I'm trying to use gitweb to provide a web interface to it. I use nginx as my web server for everything else, so I don't really want to have to use another just for this. I'm mostly following this guide: http://michalbugno.pl/en/blog/gitweb-nginx, which is the only guide I can find via google and is really recent. fcgiwrap apparently isn't in Lucid Lynx's repositories, so I installed it manually. I spawn instances via spawn-fcgi: spawn-fcgi -f /usr/local/sbin/fcgiwrap -a 127.0.0.1 -p 9001 That's all good. My /etc/gitweb.conf is as follows: # path to git projects (<project>.git) #$projectroot = "/home/raynes/pubgit"; $my_uri = "http://mc.raynes.me"; $home_link = "http://mc.raynes.me/"; # directory to use for temp files $git_temp = "/tmp"; # target of the home link on top of all pages #$home_link = $my_uri || "/"; # html text to include at home page $home_text = "indextext.html"; # file with project list; by default, simply scan the projectroot dir. $projects_list = $projectroot; # stylesheet to use $stylesheet = "/gitweb/gitweb.css"; # logo to use $logo = "/gitweb/git-logo.png"; # the 'favicon' $favicon = "/gitweb/git-favicon.png"; And my nginx server configuration is this: server { listen 80; server_name mc.raynes.me; location / { root /usr/share/gitweb; if (!-f $request_filename) { fastcgi_pass 127.0.0.1:9001; } fastcgi_index index.cgi; fastcgi_param SCRIPT_FILENAME /scripts$fastcgi_script_name; include fastcgi_params; } } The only difference here is that I've set fastcgi_pass to 127.0.0.1:9001. When I go to http://mc.raynes.me I'm greeted with a page that simply says "403" and nothing else. I have not the slightest clue what I did wrong. Any ideas?

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• nginx proxypath https redirects to http

  - by Thermionix

  I'm trying to setup Nginx to forward requests to several backend services using proxy_pass however several pages load with 404s The links on the pages have https:// in front, but result in a http request - which ends in a 404 - I only want these services to be available through https. I've tried with varied trailing forward slashes appended to the proxypath and location in proxy.conf, I've also tried commenting out www.conf (just incase its location blocks could have caused any conflicts) to no effect. So if a link is too https://example.com/sickbeard/errorlogs in a browser when loaded https://example.com/sickbeard/errorlogs gives a 404 in a browser https://example.com/sickbeard/errorlogs/ loads nginx error log; 2011/11/23 14:21:58 [error] 28882#0: *6 "/var/www/sickbeard/errorlogs/recent.html" is not found (2: No such file or directory), client: 192.168.1.99, server: example.com, request: "GET /sickbeard/errorlogs/ HTTP/1.1", host: "example.com" Config files; proxy.conf location /sickbeard { proxy_pass http://localhost:8081/sickbeard; include proxy.inc; } .... more entries .... sites-enabled/main server { listen 80; include www.conf; } server { listen 443; include proxy.conf; include www.conf; ssl on; } www.conf root /var/www; server_name example.com; location / { autoindex off; allow all; rewrite ^/$ /mainsite last; location ~* \.(jpg|jpeg|gif|css|png|js|ico)$ { expires max; } location ~ \.php$ { fastcgi_index index.php; include fastcgi_params; if (-f $request_filename) { fastcgi_pass 127.0.0.1:9000; } } } proxy.inc proxy_connect_timeout 59s; proxy_send_timeout 600; proxy_read_timeout 600; proxy_buffer_size 64k; proxy_buffers 16 32k; proxy_pass_header Set-Cookie; proxy_redirect off; proxy_hide_header Vary; proxy_busy_buffers_size 64k; proxy_temp_file_write_size 64k; proxy_set_header Accept-Encoding ''; proxy_ignore_headers Cache-Control Expires; proxy_set_header Referer $http_referer; proxy_set_header Host $host; proxy_set_header Cookie $http_cookie; proxy_set_header X-Real-IP $remote_addr; proxy_set_header X-Forwarded-Host $host; proxy_set_header X-Forwarded-Server $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

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• CakePHP in a subdirectory using nginx (Rewrite rules?)

  - by lhnz

  I managed to get this to work a while back, but on returning to the cakephp project I had started it seems that whatever changes I've made to nginx recently (or perhaps a recent update) have broken my rewrite rules. Currently I have: worker_processes 1; events { worker_connections 1024; } http { include mime.types; default_type application/octet-stream; sendfile on; keepalive_timeout 65; server { listen 80; server_name localhost; location / { root html; index index.php index.html index.htm; } location /basic_cake/ { index index.php; if (-f $request_filename) { break; } if (!-f $request_filename) { rewrite ^/basic_cake/(.+)$ /basic_cake/index.php?url=$1 last; break; } } location /cake_test/ { index index.php; if (-f $request_filename) { break; } if (!-f $request_filename) { rewrite ^/cake_test/(.+)$ /cake_test/index.php?url=$1 last; break; } } # redirect server error pages to the static page /50x.html # error_page 500 502 503 504 /50x.html; location = /50x.html { root html; } # pass the PHP scripts to FastCGI server listening on 127.0.0.1:9000 # location ~ \.php$ { root html; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } } server { listen 8081; server_name localhost; root /srv/http/html/xsp; location / { index index.html index.htm index.aspx default.aspx; } location ~ \.(aspx|asmx|ashx|asax|ascx|soap|rem|axd|cs|config|dll)$ { fastcgi_pass 127.0.0.1:9001; fastcgi_param SCRIPT_FILENAME $document_root$fastcgi_script_name; include fastcgi_params; } } } The problem that I have is that the css and images will not load from the webroot. Instead if I visit http://localhost/basic_cake/css/cake.generic.css, I get a page which tells me: CakePHP: the rapid development php framework Missing Controller Error: CssController could not be found. Error: Create the class CssController below in file: app/controllers/css_controller.php var $name = 'Css'; } ? Notice: If you want to customize this error message, create app/views/errors/missing_controller.ctp CakePHP: the rapid development php framework Does anybody have any ideas on how to fix this?

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• amd gpu but display on intel integrated graphics

  - by pitseeker

  On my Ubuntu 12.04 I connected my monitor to the onboard intel graphics. I'd like to use my ati radeon 6770 for opencl tasks (e.g. bitcoin mining). So far I couldn't figure out how to get the ati driver working. When calling "aticonfig --initial -f" it always writes a new xorg.conf that ignores the intel graphics. At boot time it works only when I attached the monitor to the ati card. So I manually tampered with the xorg.conf and got this: Section "ServerLayout" Identifier "Default Monitor" Screen 0 "myscreen" 0 0 Screen 1 "deadscreen" RightOf "myscreen" EndSection Section "Module" EndSection Section "Monitor" Identifier "Default Monitor" Option "VendorName" "Monitor Vendor" Option "ModelName" "Monitor Name" Option "DPMS" "true" EndSection Section "Monitor" Identifier "null Monitor" Option "Enable" "false" EndSection Section "Device" Identifier "Intel Integrated Graphics" Driver "intel" BusID "PCI:0:2:0" Screen 0 EndSection Section "Device" Identifier "aticonfig-Device[0]-0" Driver "fglrx" BusID "PCI:1:0:0" Screen 1 EndSection Section "Screen" Identifier "myscreen" Device "Intel Integrated Graphics" Monitor "Default Monitor" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection Section "Screen" Identifier "deadscreen" Device "aticonfig-Device[0]-0" Monitor "null Monitor" DefaultDepth 24 SubSection "Display" Viewport 0 0 Depth 24 EndSubSection EndSection I think this might be the right way since I see that X tries to start both drivers in /var/log/Xorg.0.log. However the fglrx driver seems crash (end of xorg.0.log): Backtrace: [ 6.625] 0: /usr/bin/X (xorg_backtrace+0x26) [0x7fb5cd41b846] [ 6.625] 1: /usr/bin/X (0x7fb5cd293000+0x18c6ea) [0x7fb5cd41f6ea] [ 6.625] 2: /lib/x86_64-linux-gnu/libpthread.so.0 (0x7fb5cc5b9000+0xfcb0) [0x7fb5cc5c8cb0] [ 6.625] 3: /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so (xdl_xs111_atiddxGetGPUMapInfo+0x1b1) [0x7fb5c88e16b1] [ 6.625] 4: /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/drivers/fglrx_drv.so (atiddxGetGPUMapInfo+0xd) [0x7fb5c87bcc0d] [ 6.625] 5: /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/extensions/libglx.so (0x7fb5ca12d000+0x1ab29) [0x7fb5ca147b29] [ 6.625] 6: /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/extensions/libglx.so (0x7fb5ca12d000+0x1cf8c) [0x7fb5ca149f8c] [ 6.625] 7: /usr/lib/x86_64-linux-gnu/xorg/extra-modules/extra-modules.dpkg-tmp/modules/extensions/libglx.so (0x7fb5ca12d000+0x1ee55) [0x7fb5ca14be55] [ 6.626] 8: /usr/bin/X (InitExtensions+0x99) [0x7fb5cd350069] [ 6.626] 9: /usr/bin/X (0x7fb5cd293000+0x3d605) [0x7fb5cd2d0605] [ 6.626] 10: /lib/x86_64-linux-gnu/libc.so.6 (__libc_start_main+0xed) [0x7fb5cb44e76d] [ 6.626] 11: /usr/bin/X (0x7fb5cd293000+0x3daad) [0x7fb5cd2d0aad] [ 6.626] Segmentation fault at address 0x14 [ 6.626] Caught signal 11 (Segmentation fault). Server aborting [ 6.626] I'd be very happy if someone can give me a hint on how to configure my ATI card while using the integrated graphics for display. Update I used most of jjhughes57 config and successfully booted the X server on intel (keyboard layout is changed though, funnily). Unfortunately the 2nd X server (fglrx) doesn't fully start. It shuts itself down right after starting [ 6.265] (II) fglrx(0): Restoring Recent Mode via PCS is not supported in RANDR 1.2 capable environments [ 6.296] (II) UnloadModule: "mouse" [ 6.296] (II) Unloading mouse [ 6.296] (II) UnloadModule: "kbd" [ 6.296] (II) Unloading kbd [ 6.298] (II) fglrx(0): Shutdown CMMQS [ 6.298] (II) fglrx(0): [uki] removed 1 reserved context for kernel [ 6.298] (II) fglrx(0): [uki] unmapping 8192 bytes of SAREA 0x2000 at 0x7fbef8209000 [ 6.337] (II) fglrx(0): Interrupt handler Shutdown. [ 6.470] ddxSigGiveUp: Closing log [ 6.470] Server terminated successfully (0). Closing log file. Thanks for any hints what is wrong here.

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• Anyone else experiencing high rates of Linux server crashes during a leap second day?

  - by Bron Gondwana

  POSTMORTEM Anticlimax: only thing that died was my VPN (openvpn) link to the cluster, so there was an exciting few seconds while it re-established. Everything else was fine. Starting back ntp everywhere. If you look at Marco's blog at http://my.opera.com/marcomarongiu/blog/2012/06/01/an-humble-attempt-to-work-around-the-leap-second - he has a solution for phasing the time change over 24 hours using ntpd -x to avoid the 1 second skip. Give that a go if it matters to you. For the systems I run, the jump isn't a problem. Just today, Sat June 30th - starting soon after the start of the day GMT. We've had a handful of blades in different datacentres as managed by different teams all go dark - not responding to pings, screen blank. They're all running Debian Squeeze - with everything from stock kernel to custom 3.2.21 builds. Most are Dell M610 blades, but I've also just lost a Dell R510 and other departments have lost machines from other vendors too. There was also an older IBM x3550 which crashed and which I thought might be unrelated, but now I'm wondering. The one crash which I did get a screen dump from said: [3161000.864001] BUG: spinlock lockup on CPU#1, ntpd/3358 [3161000.864001] lock: ffff88083fc0d740, .magic: dead4ead, .owner: imapd/24737, .owner_cpu: 0 Unfortunately the blades all supposedly had kdump configured, but they died so hard that kdump didn't trigger - and they had console blanking turned on. I've disabled console blanking now, so fingers crossed I'll have more information after the next crash. Just want to know if it's a common thread or "just us". It's really odd that they're different units in different datacentres bought at different times and run by different admins (I run the FastMail.FM ones)... and now even different vendor hardware. Most of the machines which crashed had been up for weeks/months and were running 3.1 or 3.2 series kernels. The most recent crash was a machine which had only been up about 6 hours running 3.2.21. THE WORKAROUND Ok people, here's how I worked around it. disabled ntp: /etc/init.d/ntp stop created http://linux.brong.fastmail.fm/2012-06-30/fixtime.pl (code stolen from Marco, see blog posts in comments) ran fixtime.pl without an argument to see that there was a leap second set ran fixtime.pl with an argument to remove the leap second NOTE: depends on adjtimex. I've put a copy of the squeeze adjtimex binary at http://linux.brong.fastmail.fm/2012-06-30/adjtimex - it will run without dependencies on a squeeze 64 bit system. If you put it in the same directory as fixtime.pl, it will be used if the system one isn't present. Obviously if you don't have squeeze 64 bit... find your own. I'm going to start ntp again tomorrow. As an anonymous user suggested - an alternative to running adjtimex is to just set the time yourself, which will presumably also clear the leapsecond counter.

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• 10.6.4 Apple Wiki: New just created users can do nothing?

  - by beefon

  Hello, After update to 10.6.4 there's an issue: any new users that I create in Server Prefs/WGM can't post to their blogs, comment, create wiki pages... They can't do anything! There's log from Wiki errors (when user DURAK tries to create new blog entry): [HTTPChannel,5,127.0.0.1] Traceback (most recent call last): [HTTPChannel,5,127.0.0.1] File "/usr/share/caldavd/lib/python/twisted/web/server.py", line 126, in process self.render(resrc) [HTTPChannel,5,127.0.0.1] File "/usr/share/caldavd/lib/python/twisted/web/server.py", line 133, in render body = resrc.render(self) [HTTPChannel,5,127.0.0.1] File "/usr/share/wikid/lib/python/apple_xmlrpc_server/WebAppServer.py", line 90, in render d = defer.maybeDeferred(function, *args) [HTTPChannel,5,127.0.0.1] File "/usr/share/caldavd/lib/python/twisted/internet/defer.py", line 104, in maybeDeferred result = f(*args, **kw) [HTTPChannel,5,127.0.0.1] --- <exception caught here> --- [HTTPChannel,5,127.0.0.1] File "/usr/share/wikid/lib/python/apple_xmlrpc_server/ContentServiceBase.py", line 121, in xmlrpc_addEntry aPage = ContentEntry.newBundleBasedContentEntry (path = path, content = content, author = author, title = title, uid = uid, type = kind, versioned = self.versioned, templateName = template) [HTTPChannel,5,127.0.0.1] File "/usr/share/wikid/lib/python/apple_wlt/ContentEntry.py", line 794, in newBundleBasedContentEntry aPage.save('First created', 'created') [HTTPChannel,5,127.0.0.1] File "/usr/share/wikid/lib/python/apple_wlt/ContentEntry.py", line 445, in save revisions.addRevision(self.serializeEntry(revisionAttributes), inComment = comment, inAuthor = updateAuthor, inChangeType = editType) [HTTPChannel,5,127.0.0.1] File "/usr/share/wikid/lib/python/apple_utilities/sqlitersion.py", line 36, in _func result = f(self, *args, **kwargs) [HTTPChannel,5,127.0.0.1] File "/usr/share/wikid/lib/python/apple_utilities/sqlitersion.py", line 49, in addRevision contentPlistStr = plistlib.writePlistToString(inContentDict).decode("utf-8") [HTTPChannel,5,127.0.0.1] File "/S-m/Lib-ry/Fr-ks/Python.fr-k/Ver-s/2.6/lib/pyth-2.6/plistlib.py", line 110, in writePlistToString [HTTPChannel,5,127.0.0.1] File "/S-m/Lib-ry/Fr-ks/Python.fr-k/Ver-s/2.6/lib/pyth-2.6/plistlib.py", line 94, in writePlist [HTTPChannel,5,127.0.0.1] File "/S-m/Lib-ry/Fr-ks/Python.fr-k/Ver-s/2.6/lib/pyth-2.6/plistlib.py", line 251, in writeValue [HTTPChannel,5,127.0.0.1] File "/S-m/Lib-ry/Fr-ks/Python.fr-k/Ver-s/2.6/lib/pyth-2.6/plistlib.py", line 280, in writeDict [HTTPChannel,5,127.0.0.1] File "/S-m/Lib-ry/Fr-ks/Python.fr-k/Ver-s/2.6/lib/pyth-2.6/plistlib.py", line 238, in writeValue [HTTPChannel,5,127.0.0.1] File "/S-m/Lib-ry/Fr-ks/Python.fr-k/Ver-s/2.6/lib/pyth-2.6/plistlib.py", line 171, in simpleElement [HTTPChannel,5,127.0.0.1] File "/S-m/Lib-ry/Fr-ks/Python.fr-k/Ver-s/2.6/lib/pyth-2.6/plistlib.py", line 221, in _escapeAndEncode [HTTPChannel,5,127.0.0.1] exceptions.UnicodeDecodeError: 'ascii' codec can't decode byte 0xd0 in position 0: ordinal not in range(128) [HTTPChannel,5,127.0.0.1] 'Unparseable html in page, removing whatever was already written.' [HTTPChannel,5,127.0.0.1] Removing /Library/Collaboration/Users/durak/weblog/27133.page Any "old" user CAN create, modify, comment, etc. What can you recommend to fix this issue? Hope for your help...

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• resolve access violation exception (0xC0000005) crashing IIS app pool

  - by Joseph

  IIS 7.5, server 2008 r2, classic asp and asp .net 2.0, 3.5 website same server, same app pool. The past 4 weeks thousands of these errors 'C0000005' are occurring. I know from IIS debug diag tool that 'C0000005' is an access violation error. Below is the top line from my debug diag report. In w3wp__PID__6656__Date__01_08_2011__Time_01_42_46AM__281__First Chance Access Violation.dmp the assembly instruction at asp!CActiveScriptEngine::GetApplication+27 in \\?\C:\Windows\System32\inetsrv\asp.dll from Microsoft Corporation has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000000 on thread 29 Thread 29 - System ID 6736 Entry point 0x00000000 Create time 1/8/2011 12:46:26 AM Time spent in user mode 0 Days 00:00:00.140 Time spent in kernel mode 0 Days 00:00:00.078 Function Source asp!CActiveScriptEngine::GetApplication+27 vbscript!COleScript::GetDebugApplicationCoreNoRef+2b vbscript!COleScript::FDebuggerEnabled+30 vbscript!COleScript::SetScriptSite+cd asp!CActiveScriptEngine::Init+125 asp!CScriptManager::GetEngine+252 asp!AllocAndLoadEngines+28f asp!ExecuteGlobal+17a asp!Execute+b5 asp!CHitObj::ViperAsyncCallback+3fc asp!CViperAsyncRequest::OnCall+6a comsvcs!CSTAActivityWork::STAActivityWorkHelper+32 ole32!EnterForCallback+f4 ole32!SwitchForCallback+1a8 ole32!PerformCallback+a3 ole32!CObjectContext::InternalContextCallback+15b ole32!CObjectContext::DoCallback+1c comsvcs!CSTAActivityWork::DoWork+12f comsvcs!CSTAThread::DoWork+18 comsvcs!CSTAThread::ProcessQueueWork+37 comsvcs!CSTAThread::WorkerLoop+135 msvcrt!_endthreadex+44 msvcrt!_endthreadex+ce kernel32!BaseThreadInitThunk+e ntdll!__RtlUserThreadStart+70 ntdll!_RtlUserThreadStart+1b BELOW is the faulting module. ASP report Executing ASP requests 0 Request(s) ASP templates cached 0 Template(s) ASP template cache size 0.00 Bytes Loaded ASP applications 1 Application(s) ASP.DLL Version 7.5.7600.16620 ASP application report ASP application metabase key Physical Path Virtual Root Session Count 0 Session(s) Request Count 0 Request(s) Session Timeout 0 minutes(s) Path to Global.asa Server side script debugging enabled False Client side script debugging enabled False Out of process COM servers allowed False Session state turned on False Write buffering turned on False Application restart enabled False Parent paths enabled False ASP Script error messages will be sent to browser False ASP!CACTIVESCRIPTENGINE::GETAPPLICATION+27In w3wp__PID__6656__Date__01_08_2011__Time_01_42_46AM__281__First Chance Access Violation.dmp the assembly instruction at asp!CActiveScriptEngine::GetApplication+27 in \\?\C:\Windows\System32\inetsrv\asp.dll from Microsoft Corporation has caused an access violation exception (0xC0000005) when trying to read from memory location 0x00000000 on thread 29 recent events: server was being brute forced by hackers all of Dec and probably earlier, they weren't able to gain access but did get a virus on and blasted out spam. insatlled AVG and about the 17 or 22 latest patches. after that the app pool started crashing and the server has crashed a couple times since then. I am in no mans land as I am a developer and not a sys admin but I have to assume many roles. So I'm reaching out for help. Sometimes I will see hundreds of these 'C0000005' scriptengine errors in the event log in a matter of seconds and other times just a few times an hour. I googled this line 'ASP!CACTIVESCRIPTENGINE::GETAPPLICATION' and got nothing. Its like the function don't exist or something. I have spent many hours google-ing to no avail and am now turning to the experts on the forums. Thank you for your help

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• Excessive Outbound DNS Traffic

  - by user1318414

  I have a VPS system which I have had for 3 years on one host without issue. Recently, the host started sending an extreme amount of outbound DNS traffic to 31.193.132.138. Due to the way that Linode responded to this, I have recently left Linode and moved to 6sync. The server was completely rebuilt on 6sync with the exception of postfix mail configurations. Currently, the daemons run are as follows: sshd nginx postfix dovecot php5-fpm (localhost only) spampd (localhost only) clamsmtpd (localhost only) Given that the server was 100% rebuilt, I can't find any serious exploits against the above stated daemons, passwords have changed, ssh keys don't even exist on the rebuild yet, etc... it seems extremely unlikely that this is a compromise which is being used to DoS the address. The provided IP is noted online as a known SPAM source. My initial assumption was that it was attempting to use my postfix server as a relay, and the bogus addresses it was providing were domains with that IP registered as their nameservers. I would imagine given my postfix configuration that DNS queries for things such as SPF information would come in with equal or greater amount than the number of attempted spam e-mails sent. Both Linode and 6Sync have said that the outbound traffic is extremely disproportionate. The following is all the information I received from Linode regarding the outbound traffic: 21:28:28.647263 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647264 IP 97.107.134.33 > 31.193.132.138: udp 21:28:28.647264 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647265 IP 97.107.134.33 > 31.193.132.138: udp 21:28:28.647265 IP 97.107.134.33.32775 > 31.193.132.138.53: 28720 op8+% [b2&3=0x4134] [17267a] [30550q] [28773n] [14673au][|domain] 21:28:28.647266 IP 97.107.134.33 > 31.193.132.138: udp 6sync cannot confirm whether or not the recent spike in outbound traffic was to the same IP or over DNS, but I have presumed as such. For now my server is blocking the entire 31.0.0.0/8 subnet to help deter this while I figure it out. Anyone have any idea what is going on?

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• unable to access a NAT'ed IP via a VPN on Windows 7

  - by crmpicco

  I connect to a range of servers hosted by one provider via a VPN. I can connect to the VPN fine, however when I then go and try and connect to the server(s) it fails. A NAT'ed IP address that has worked up until today, has stopped working either via SSH/SFTP. As you can see below, if I try and ping the IP then it responds with Destination host unreachable, but, for some reason it says the reply is from 192.168.0.8? If it enter this IP address in my browser, I get nothing. Where is this IP coming from and is there any good reason why I cannot access the IP I am trying to ping? C:\Users\crmpicco>ping 172.26.100.x Pinging 172.26.100.x with 32 bytes of data: Reply from 192.168.0.8: Destination host unreachable. Reply from 192.168.0.8: Destination host unreachable. Reply from 192.168.0.8: Destination host unreachable. Reply from 192.168.0.8: Destination host unreachable. Ping statistics for 172.26.100.x: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), I have the VPN remote host address of 80.75.67.x, which shows me as being connected. But i'm unsure if there is a config issue at the server side or my end that has caused this issue? I have had some recent Win7 (automatic) updates, but it's hard to tell if that's caused this problem. This is my output from arp: C:\Users\cmorton>arp -a Interface: 192.168.0.8 --- 0xe Internet Address Physical Address Type 192.168.0.1 00-18-4d-b9-68-5e dynami 192.168.0.6 00-f4-b9-68-0c-9a dynami 192.168.0.7 08-00-27-f2-9f-d6 dynami 192.168.0.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.251 01-00-5e-00-00-fb static 224.0.0.252 01-00-5e-00-00-fc static 239.255.255.250 01-00-5e-7f-ff-fa static 255.255.255.255 ff-ff-ff-ff-ff-ff static Interface: 192.168.56.1 --- 0x15 Internet Address Physical Address Type 192.168.56.255 ff-ff-ff-ff-ff-ff static 224.0.0.22 01-00-5e-00-00-16 static 224.0.0.251 01-00-5e-00-00-fb static 224.0.0.252 01-00-5e-00-00-fc static 255.255.255.255 ff-ff-ff-ff-ff-ff static

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• Any way to recover ext4 filesystems from a deleted LVM logical volume?

  - by Vegar Nilsen

  The other day I had a proper brain fart moment while expanding a disk on a Linux guest under Vmware. I stretched the Vmware disk file to the desired size and then I did what I usually do on Linux guests without LVM: I deleted the LVM partition and recreated it, starting in the same spot as the old one, but extended to the new size of the disk. (Which will be followed by fsck and resize2fs.) And then I realized that LVM doesn't behave the same way as ext2/3/4 on raw partitions... After restoring the Linux guest from the most recent backup (taken only five hours earlier, luckily) I'm now curious on how I could have recovered from the following scenario. It's after all virtually guaranteed that I'll be a dumb ass in the future as well. Virtual Linux guest with one disk, partitioned into one /boot (primary) partition (/dev/sda1) of 256MB, and the rest in a logical, extended partition (/dev/sda5). /dev/sda5 is then setup as a physical volume with pvcreate, and one volume group (vgroup00) created on top of it with the usual vgcreate command. vgroup00 is then split into two logical volumes root and swap, which are used for / and swap, logically. / is an ext4 file system. Since I had backups of the broken guest I was able to recreate the volume group with vgcfgrestore from the backup LVM setup found under /etc/lvm/backup, with the same UUID for the physical volume and all that. After running this I had two logical volumes with the same size as earlier, with 4GB free space where I had stretched the disk. However, when I tried to run "fsck /dev/mapper/vgroup00-root" it complained about a broken superblock. I tried to locate backup superblocks by running "mke2fs -n /dev/mapper/vgroup00-root" but none of those worked either. Then I tried to run TestDisk but when I asked it to find superblocks it only gave an error about not being able to open the file system due to a broken file system. So, with the default allocation policy for LVM2 in Ubuntu Server 10.04 64-bit, is it possible that the logical volumes are allocated from the end of the volume group? That would definitely explain why the restored logical volumes didn't contain the expected data. Could I have recovered by recreating /dev/sda5 with exactly the same size and disk position as earlier? Are there any other tools I could have used to find and recover the file system? (And clearly, the question is not whether or not I should have done this in a different way from the start, I know that. This is a question about what to do when shit has already hit the fan.)

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• Upgrading php from php 5.3 to 5.4 .7

  - by Takingsides

  So, quickly so to speak I have noticed this topic around, I have searched and there are plenty of solutions. However these solutions do not work for me, not only that but I'm intending to learn more about the Debian based OS. Questions I would like to know how to upgrade php5.3 to php 5.4.7 compiling it from source, myself without using a third-party ppa. Is the way (explained below) the correct way of configuring php5.4? I'm new to compiling from source. Set-up I run Ubuntu Server 12.04 64bit. I've currently got: PHP 5.3 MySQL-Server Apache2 Memcached The Problem So I initially installed php5.3 using apt-get. I now wish to upgrade the php 5.4 due to the advantage of traits in OOP and the struct with Arrays and all the other recent patches and such. Possible Solutions I've seen this ondrej/ppa repository, which I refuse to use, given the fact that it may work, but it's an unknown/untrusted source. ALso, i'm not learning how to administer from source, using configure, make and install accordingly. I've seen a solution compiling from source, which is essentially how I was hoping to go about it with some guidance. Conclusion So I didn't just expect to be spoon-fed, and I went out and did some manual reading and atleast started the ball rolling myself; this how far i've got. The first thing I did was su into root (to save the typing sudo all the darn time). $ sudo su The next thing I did was download the latest version of php (5.4.7) and extracted it's contents ready to configure before installing it. $ mkdir php5-new && cd !$ $ wget -O php-5.4.7.tar.bz2 http://php.net/get/php-5.4.7.tar.bz2/from/uk3.php.net/mirror $ bzip2 -d php-5.4.7.tar.bz2 $ tar xvf php-5.4.7.tar.gz $ cd php-5.4.7 $ ./configure --help Finally I decided to have a bash, I looked through the list of options and decided I needed to list ALL of the things I wanted to include in the configuration. $ ./configure --with-mysql --with-apache2 --with-libxml --with-openssl --with-zlib --with-bz2 --with-curl --with-dom --with-gd --with-imap --with-imap-ssl --with-mcrypt --with-mysqli --with-pdo-mysql --with-libxml --enable-ftp --enable-mbstring --enable-soap Finally, the results... When the configuration process had finished, it threw an error: configure: error: xml2-config not found. Please check your libxml2 installation.

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• Thinkpad speaker turns mute - Linux Codec issue?

  - by Curlew

  At some point a few days ago the speakers on my Lenovo Thinkpad T410 (Model number: 2537A11) suddenly stopped working randomly. This error happens every time I watch a video or listen to a music file. The sound just abruptly stops. At the moment, I can't produce a single sound no matter what I do. I am using Debian GNU/Linux on this laptop and there doesn't appear to be anything else wrong (the fan is working, no abnormal heat (staying around ~40°C), no other obvious errors or problems). Here is the output of a nice program someone pointed me to: martin@martin:~/Downloads$ sudo python run.py --monitor Using temporary directory: /dev/shm/hda-analyzer You may remove this directory when finished or if you like to download the most recent copy of hda-analyzer tool. Downloading file hda_analyzer.py Downloading file hda_guilib.py Downloading file hda_codec.py Downloading file hda_proc.py Downloading file hda_graph.py Downloading file hda_mixer.py Downloaded all files, executing hda_analyzer.py Watching 1 cards ====================================== Sound is working normally and then it stops and the following lines appear: Diff for codec 0/0 (0x14f15069): --- +++ @@ -164,17 +164,17 @@ Power: setting=D0, actual=D0 Node 0x1f [Pin Complex] wcaps 0x400501: Stereo Pincap 0x00000010: OUT Pin Default 0x901701f0: [Fixed] Speaker at Int N/A Conn = Analog, Color = Unknown DefAssociation = 0xf, Sequence = 0x0 Misc = NO_PRESENCE Pin-ctls: 0x40: OUT - Power: setting=D0, actual=D0 + Power: setting=D3, actual=D3 Connection: 2 0x10* 0x11 Node 0x20 [Pin Complex] wcaps 0x400781: Stereo Digital Pincap 0x00000010: OUT Pin Default 0x40f001f0: [N/A] Other at Ext N/A Conn = Unknown, Color = Unknown DefAssociation = 0xf, Sequence = 0x0 Misc = NO_PRESENCE And now there is also an error in the dmesg output hda-intel: IRQ timing workaround is activated for card #0. Suggest a bigger bdl_pos_adj. I changed the bdl_pos_adj to various numbers (-1, 0, 64, 1024) and either there is no change at all or dmesg reports that the adjustment is too big. I wonder if this bdl_pos_adj is the real reason for the error. Here is my hardware information provided by alsa-info.sh website. Okay, i did some serious testing and even installed Windows and now i officially conclude that this is a hard-ware related issue with my Laptop speakers. Reason: The error occurs in my installed Debian Linux, an Ubuntu Live distribution and Windows XP No error-message appears in all of the OS. The sound just keeps running and i can't hear a thing. I tested different setups, including OSS, ALSA and the pulseaudio server on top If i use my new usb-headphones i can hear sound all the time without any sudden silences. So obviously, although hard to believe, my laptop speakers are not okay (never heard of similar cases). I'll award the bounty to anyone who can point me to good tutorials or the procedure how to exchange my T410 speakers (i still have warranty. The laptop was bought in Germany, but now i am in Denmark). Or to someone who can explain me the output from hda-analyzer (big log above).

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• Is there a Distributed SAN/Storage System out there?

  - by Joel Coel

  Like many other places, we ask our users not to save files to their local machines. Instead, we encourage that they be put on a file server so that others (with appropriate permissions) can use them and that the files are backed up properly. The result of this is that most users have large hard drives that are sitting mainly empty. It's 2010 now. Surely there is a system out there that lets you turn that empty space into a virtual SAN or document library? What I envision is a client program that is pushed out to users' PCs that coordinates with a central server. The server looks to users just like a normal file server, but instead of keeping entire file contents it merely keeps a record of where those files can be found among various user PCs. It then coordinates with the right clients to serve up file requests. The client software would be able to respond to such requests directly, as well as be smart enough to cache recent files locally. For redundancy the server could make sure files are copied to multiple PCs, perhaps allowing you to define groups in different locations so that an instance of the entire repository lives in each group to protect against a disaster in one building taking down everything else. Obviously you wouldn't point your database server here, but for simpler things I see several advantages: Files can often be transferred from a nearer machine. Disk space grows automatically as your company does. Should ultimately be cheaper, as you don't need to keep a separate set of disks I can see a few downsides as well: Occasional degradation of user pc performance, if the machine has to serve or accept a large file transfer during a busy period. Writes have to be propogated around the network several times (though I suspect this isn't really much of a problem, as reading happens in most places more than writing) Still need a way to send a complete copy of the data offsite occasionally, and this would make it very hard to do differentials Think of this like a cloud storage system that lives entirely within your corporate LAN and makes use of your existing user equipment. Our old main file server is due for retirement in about 2 years, and I'm looking into replacing it with a small SAN. I'm thinking something like this would be a better fit. As a school, we have a couple computer labs I can leave running that would be perfect for adding a little extra redundancy to the system. Unfortunately, the closest thing I can find is Dienst, and it's just a paper that dates back to 1994. Am I just using the wrong buzzwords in my searches, or does this really not exist? If not, is there a big downside that I'm missing?

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• APC PHP cache size does not exceed 32MB, even though settings allow for more

  - by hardy101

  I am setting up APC (v 3.1.9) on a high-traffic WordPress installation on CentOS 6.0 64 bit. I have figured out many of the quirks with APC, but something is still not quite right. No matter what settings I change, APC never actually caches more than 32MB. I'm trying to bump it up to 256 MB. 32MB is a default amount for apc.shm_size, so I am wondering if it's stuck there somehow. I have run the following echo '2147483648' > /proc/sys/kernel/shmmax to increase my system's shared memory to 2G (half of my 4G box). Then ran ipcs -lm which returns ------ Shared Memory Limits -------- max number of segments = 4096 max seg size (kbytes) = 2097152 max total shared memory (kbytes) = 8388608 min seg size (bytes) = 1 Also made a change in /etc/sysctl.conf then ran sysctl -p to make the settings stick on the server. Rebooted, too, for good measure. In my APC settings, I have mmap enabled (which happens by default in recent versions of APC). php.ini looks like: apc.stat=0 apc.shm_size="256M" apc.max_file_size="10M" apc.mmap_file_mask="/tmp/apc.XXXXXX" apc.ttl="7200" I am aware that mmap mode will ignore references to apc.shm_segments, so I have left it out with default 1. phpinfo() indicates the following about APC: Version 3.1.9 APC Debugging Disabled MMAP Support Enabled MMAP File Mask /tmp/apc.bPS7rB Locking type pthread mutex Locks Serialization Support php Revision $Revision: 308812 $ Build Date Oct 11 2011 22:55:02 Directive Local Value apc.cache_by_default On apc.canonicalize O apc.coredump_unmap Off apc.enable_cli Off apc.enabled On On apc.file_md5 Off apc.file_update_protection 2 apc.filters no value apc.gc_ttl 3600 apc.include_once_override Off apc.lazy_classes Off apc.lazy_functions Off apc.max_file_size 10M apc.mmap_file_mask /tmp/apc.bPS7rB apc.num_files_hint 1000 apc.preload_path no value apc.report_autofilter Off apc.rfc1867 Off apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.rfc1867_ttl 3600 apc.serializer default apc.shm_segments 1 apc.shm_size 256M apc.slam_defense On apc.stat Off apc.stat_ctime Off apc.ttl 7200 apc.use_request_time On apc.user_entries_hint 4096 apc.user_ttl 0 apc.write_lock On apc.php reveals the following graph, no matter how long the server runs (cache size fluctuates and hovers at just under 32MB. See image http://i.stack.imgur.com/2bwMa.png You can see that the cache is trying to allocate 256MB, but the brown piece of the pie keeps getting recycled at 32MB. This is confirmed as refreshing the apc.php page shows cached file counts that move up and down (implying that the cache is not holding onto all of its files). Does anyone have an idea of how to get APC to use more than 32 MB for its cache size?? **Note that the identical behavior occurs for eaccelerator, xcache, and APC. I read here: http://www.litespeedtech.com/support/forum/archive/index.php/t-5072.html that suEXEC could cause this problem.

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• Rails /tmp/cache/assets permissions issue using Debian virtual machine hosted on OS X Lion

  - by Jim

  I am running Parallels Desktop 7 on OS X Lion. I have a VM with Debian installed, and inside that VM I setup a Rails development environment. I am using Parallels Tools to share out my OS X home directory to the VM - the goal here is to run the Rails server on the VM, but host the files on OS X (so they are automatically backed up, and so I can use tools like Textmate to develop with). Everything seems to work with the shared directory - my Debian user can read, write, and execute files. However, when I cloned a recent Rails project from Git, I got an error message when it tried to compile the CSS assets. My symptoms are exactly the same as in the question: http://stackoverflow.com/questions/7556774/rails-sprocket-error-compiling-css-assest-chown-issue I believe this is permissions-based, but it is really weird. My entire Rails project directory has permissions set to 777 and my Debian user owns it. If I navigate into /tmp/cache/assets, those permissions are the same. However, the three-character directories Rails is creating (DCE, DA1, D05, etc...) are being created without write permissions! If I refresh the Rails page a few times, about 4 or 5 (with Rails creating new three-character directories every time), eventually it will create one of the directories with the proper 777 permissions and everything will work! This will persist until I make a change to the CSS files and it has to recompile. Does anyone have any idea what might be going on here? I can't fathom why it is creating temp directories with incorrect permissions, or why after a few refreshes the good permissions kick in and it works... It definitely seems to be an issue with the share, since if I move the project into a different directory on the VM, it seems to work fine. On the OS X side, I've given the shared folder 777 permissions as well, but no dice...any ideas? Update I've found that the number of times I need to refresh before it works is not random - it has to do with how many assets are being compiled. For example, if I edit one of my CSS files, and there are four CSS files in the app/assets/stylesheets directory, I have to refresh four times before the app will finally work without the operation not permitted error...

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• ZFS Recover from Faulted Pool State

  - by nickv2002

  I have a six disk ZFS raidz1 pool and had a recent failure requiring a disk replacement. No problem normally, but this time my server hardware died before I could do the replacement (but after and unrelated to the drive failure as far as I can tell). I was able to get another machine from a friend to rebuild the system, but in the process of moving my drives over I had to swap their cables around a bunch until I got the right configuration where the remaining 5 good disks were seen as online. This process seems to have generated some checksum errors for the pool/raidz. I have the 5 remaining drives set up now and a good drive installed and ready to take the place of the drive that died. However, since my pool state is FAULTED I'm unable to do the replacement. root@zfs:~# zpool replace tank 1298243857915644462 /dev/sdb cannot open 'tank': pool is unavailable Is there any way to recover from this error? I would think that having 5 of the 6 drives online would be enough to rebuild the right data, but that doesn't seem to be enough now. Here's the status log of my pool: root@zfs:~# zpool status tank pool: tank state: FAULTED status: One or more devices could not be used because the label is missing or invalid. There are insufficient replicas for the pool to continue functioning. action: Destroy and re-create the pool from a backup source. see: http://zfsonlinux.org/msg/ZFS-8000-5E scan: none requested config: NAME STATE READ WRITE CKSUM tank FAULTED 0 0 1 corrupted data raidz1-0 ONLINE 0 0 8 sdd ONLINE 0 0 0 sdf ONLINE 0 0 0 sdh ONLINE 0 0 0 1298243857915644462 UNAVAIL 0 0 0 was /dev/sdb1 sde ONLINE 0 0 0 sdg ONLINE 0 0 0 Update (10/31): I tried to export and re-import the array a few times over the past week and wasn't successful. First I tried: zpool import -f -R /tank -N -o readonly=on -F tank That produced this error immediately: cannot import 'tank': I/O error Destroy and re-create the pool from a backup source. I added the '-X' option to the above command to try to make it check the transaction log. I let that run for about 48 hours before giving up because it had completely locked up my machine (I was unable to log in locally or via the network). Now I'm trying a simple zpool import tank command and that seems to run for a while with no output. I'll leave it running overnight to see if it outputs anything.

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• How to use AD/GPO/Print Services to "push out" a new printer driver to replace a broken one? How did my server get a broken driver?

  - by Zac B

  Context: We have an AD/GPO-managed corporate network with a little over a hundred PCs running Windows 7 x64, and a few managed printers. Our Server2008R2 primary domain controller is configured as a print server for them all. Problem: After a recent windows update and restart (no printer driver updates were included) on the DC, a particular shared printer (Lexmark T650) has begin exhibiting some strange behavior. First, it prints a preceding and following blank page for almost every document, on jobs submitted by about half of client machines (no separator page is configured on the server or any of the clients I've seen). Second, whenever someone tries to access "Printing Preferences" on any client, they recieve the following error message (this happens everywhere, 100% of the time, and didn't happen before the update on the DC): Once they click "OK", the prefs screen appears (with no separator page selected) and everything seems fine. I'm not even sure if these two issues are related, but everyone seems affected by one or both of those issues. What I've Tried: I've been hesitant to un-deploy the problem printer, or remove it via GPO, as it's pretty heavily used. I've tried updating (via MS update and our internal WSUS server) client machines and the DC. No printer driver updates have appeared, and no number of updates or restarts on the server or the client seems to have achieved anything other than my boss getting grumpy that I'm bouncing the domain controller so often. I've tried deleting the drivers on the server, and re-installing them from the original source that has worked for the past year...no change. I've tried selecting "New Driver" for one of the shared printers on a client machine, running as domain admin, and pushed the latest driver found by MSupdate back up to the DC. This changed the version number of the driver recorded in the print server manager, but caused no change--on the client I pushed from, or on any other. The error still appears. Question: Why the heck is this happening? Obviously, I got a bad driver from somewhere, but how do I get rid of it? I don't know of any "roll back drivers" functionality for centrally managed print drivers like Windows offers for other devices. How would I a) get this issue resolved on a client, and b) push the fix to the other members of the domain?

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• Mysterious visitor to hidden PHP page

  - by B. VB.

  On my website, I have a "hidden" page that displays a list of the most recent visitors. There exist no links at all to this single PHP page, and, theoretically, only I know of its existence. I check it many times per day to see what new hits I have. However, about once a week, I get a hit from a 208.80.194.* address on this supposedly hidden page (it records hits to itself). The strange thing is this: this mysterious person/bot does not visit any other page on my site. Not the public PHP pages, but only this hidden page that prints the visitors. It's always a single hit, and the HTTP_REFERER is blank. The other data is always some variation of Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.2.0; FunWebProducts; .NET CLR 1.1.4322; SpamBlockerUtility 4.8.4; yplus 5.1.04b) ... but sometimes MSIE 6.0 instead of 7, and various other plug ins. The browser is different every time, as with the lowest-order bits of the address. And it's just that. One hit per week or so, to that one page. Absolutely no other pages are touched by this mysterious vistor. Doing a whois on that IP address showed it's from the new york area, and from the "Websense" ISP. The lowest order 8 bits of their address are always different, but always from 208.80.194.*/8. From most of the computers that I access my website, doing a tracerout to my server does not contain a router anywhere along the way with the IP 208.80.*. So that rules out any kind of HTTP sniffing, I might think. I have NO idea how, why this is happening. Does anyone have any clue, or have seen something as strange as this before? It seems completely benign, but unexplainable and a little creepy. Thanks in advance!

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• Correcting tree from messed up file tree in NTFS partition

  - by Fullmooninu

  It's a real messed situation, but I'm quite at the end of my options. It's my personal hardrive, so it's very important for me, and yes, I have no backup =( The short story: 1) I have two discs. One with Windows, and another where I had a bit of empty space at the front of the disk, so i could install Linux. The rest was occupied by a 1.8TB NTFS partition filled with data. 2) I installed Linux, and after a while realized there was not enough space for everything, so I tried using Gparted, and told it to re-size the NTFS partition, to a lesser size. 3) The system jammed. I had to reboot and broke the Resizing operation. Here's what I did to fix it: a) Rebooted into Linux Live, and used Testdisk,to deep analyze the disk, and recover the possible partitions. It found several versions of the NTFS partitions, probably made during the resizing. I told Testdisk to open every one of them, and only one could list its files. When trying to open the other options on Testdisk, it showed an error message. I assumed the one without errors, to be the correct one, and I told Testdisk to recover the partition, and write a new MBR. b) The partition had errors, and Linux has a NTFS fixing tool, used it, but the system still had errors. c) So I booted into windows and use chkdsk to correct all errors in the partition. d) Everything seems fine, but now, back in Windows, when I open one file, it opens another file, or part of another file. As in, some files took up the position of other files. What I think happened is that I recovered an old tree, and not the most current one. And that one just happened to be intact, while the most recent one was damaged. As such, the files that were moved during the failed resizing, were now, during the automatic correction, assumed wrongly to be in their correct places. So when I open a file, it tries to open another one. Radiohead - Creep.mp3 will open and it will actually be a bit from another song, or even code from a jpg. Some files seem to be all right, but others have seemed to have had their position taken by others. Anyone knows of something really powerful that can help me solve this?

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• Need help recovering a corrupt SQL database

  - by user570079

  I have a very special case that I have been working on for several days. I have a very large SQL Server 2008 database (about 2 TB) that contains 500 filegroups to support very large partitioned tables. Recently we had a catastophic failure on one of the drive and lost several filegroups and the database became in-accessible. We have been doing filegroup backups on a daily basis, but due to other issues, we lost our most recent backup of the log and the primary filegroup. We have all the data backed up but the primary filegroup backup is old. There have been no schema changes since the primary filegroup backup, but the lsn's are now all out of sync and we cannot recover the data. I have tried everything I could think of (and have tried just about every trick and hack I could google) but I still end up at the same point where I get messages saying that the files for filegroup x do not match the primary filegroup. I am now at the point of trying to edit the system tables (we have a separate temporary environment to do this so we are not worried about corrupting any production databases). I have tried updated sys.sysdbreg, sys.sysbrickfiles, and sys.sysprufiles to try to trick SQL into thinking all the files are online, but a "Select * From OPENROWSET(TABLE DBPROP, 5)" shows a different database state from what I see in sys.sysdbreg. I am now thinking I need to somehow edit the headers of the actual data files to try to line up the lsn's with the primary. I appreciate any help anyone can give me here, but please do not respond with things like "you are not supposed to do edit mdf, ndf files...." or "see msdn article....", etc. This is an advanced emergency case and I need a real hack so we can just get to the data in this corrupt database and export to a fresh new database. I know there is a way to do this, but not knowing what the DBPROP system functions does (i.e. does it look at system tables or does it actually open the file) is keeping me from trying to figure out how to fool SQL into allowing me to read these files. Thanks for any help.

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