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• Server Recovery from Denial of Service

  - by JMC

  I'm looking at a server that might be misconfigured to handle Denial of Service. The database was knocked offline after the attack, and was unable to restart itself after it failed to restart when the attack subsided. Details of the Attack: The Attacker either intentionally or unintentionally sent 1000's of search queries using the applications search query url within a couple of seconds. It looks like the server was overwhelmed and it caused the database to log this message: Server Specs: 1.5GB of dedicated memory Are there any obvious mis-configurations here that I'm missing? **mysql.log** 121118 20:28:54 mysqld_safe Number of processes running now: 0 121118 20:28:54 mysqld_safe mysqld restarted 121118 20:28:55 [Warning] option 'slow_query_log': boolean value '/var/log/mysqld.slow.log' wasn't recognized. Set to OFF. 121118 20:28:55 [Note] Plugin 'FEDERATED' is disabled. 121118 20:28:55 InnoDB: The InnoDB memory heap is disabled 121118 20:28:55 InnoDB: Mutexes and rw_locks use GCC atomic builtins 121118 20:28:55 InnoDB: Compressed tables use zlib 1.2.3 121118 20:28:55 InnoDB: Using Linux native AIO 121118 20:28:55 InnoDB: Initializing buffer pool, size = 512.0M InnoDB: mmap(549453824 bytes) failed; errno 12 121118 20:28:55 InnoDB: Completed initialization of buffer pool 121118 20:28:55 InnoDB: Fatal error: cannot allocate memory for the buffer pool 121118 20:28:55 [ERROR] Plugin 'InnoDB' init function returned error. 121118 20:28:55 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 121118 20:28:55 [ERROR] Unknown/unsupported storage engine: InnoDB 121118 20:28:55 [ERROR] Aborting **ulimit -a** core file size (blocks, -c) 0 data seg size (kbytes, -d) unlimited scheduling priority (-e) 0 file size (blocks, -f) unlimited pending signals (-i) 13089 max locked memory (kbytes, -l) 64 max memory size (kbytes, -m) unlimited open files (-n) 1024 pipe size (512 bytes, -p) 8 POSIX message queues (bytes, -q) 819200 real-time priority (-r) 0 stack size (kbytes, -s) 8192 cpu time (seconds, -t) unlimited max user processes (-u) 1024 virtual memory (kbytes, -v) unlimited file locks (-x) unlimited **httpd.conf** StartServers 10 MinSpareServers 8 MaxSpareServers 12 ServerLimit 256 MaxClients 256 MaxRequestsPerChild 4000 **my.cnf** innodb_buffer_pool_size=512M # Increase Innodb Thread Concurrency = 2 * [numberofCPUs] + 2 innodb_thread_concurrency=4 # Set Table Cache table_cache=512 # Set Query Cache_Size query_cache_size=64M query_cache_limit=2M # A sort buffer is used for optimizing sorting sort_buffer_size=8M # Log slow queries slow_query_log=/var/log/mysqld.slow.log long_query_time=2 #performance_tweak join_buffer_size=2M **php.ini** memory_limit = 128M post_max_size = 8M

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• Windows file association for README, INSTALL, LICENSE and the like [closed]

  - by Lumi

  Possible Duplicate: How to set the default program for opening files without an extension in Windows? Many files originating in the UNIX world come without file extension. Popular examples include README, INSTALL, LICENSE. We know for a fact that these are text files. It is therefore a bit disappointing not to be able to just double-click them open in Explorer and see them in Notepad (actually, Notepad2 because of the UNIX line endings which silly Microsoft Notepad doesn't render correctly). Does anyone know of a way to create a file association for, say, README files without extension? This could then be replicated to cover the most frequently occurring file types, and then double-clicking them open would work. Update (Sort of in response to all your comments.) Thanks, folks, your comments and answers have helped me. @Indrek, yes, I was under the assumption that you could somehow create an association for just README or Makefile, and couldn't do so for files without extension. Turns out the contrary is true, and yes, that is a workaround that neatly solves the issue. Ultimately, I just want to be able to double-click to open a README or Makefile, that's all. @Sampo, the SendMe trick is also useful, although usability is not as great as a straight double-click. (I'm really lazy sometimes.) Turns out the following trick using ftype and ftype from an Administrator prompt does the double-click enabling job: assoc .=no_ext ftype no_ext=%SystemRoot%\system32\NOTEPAD.EXE %1 :: You can see it created some entries in the registry: reg query hkcr\no_ext /s reg query hkcr\. /s

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• Server memory issues, and expected level of service from hosting company

  - by Greg

  I'm involved in maintaining an Ubuntu VPS which runs our django websites (nginx/apache/mod_wsgi) and we've been having some memory spikes which have either caused the database to die, or induced kernel panic when the memory management system can't find any killable processes. I'm working on fixing the memory spikes, but I'm wondering whether there's anything I can do to better deal with the problem if it occurs again. Are there any tools I could use to detect the memory spikes and then, say, kill the offending process and email the server admin to fix it up? Killing off one website so that the server can remain operational is certainly preferable to the whole thing falling over. Also, we were charged $600 for after-hours service because we had to get the hosting company to restart the server - is this standard practice among hosting companies? Another provider I work with provides a panel with which I can stop and start the server myself, and given that a restart was all that was needed, $600 seems mightily excessive. (That's NZD, it's around $445 USD)

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• Nexenta under KVM?

  - by Nick

  I have an Ubuntu Server running KVM. I'd like to get the benefits of ZFS so I was thinking of installing a virtual machine under KVM running Nexenta (or NexentaStor), allowing that virtual machine to have raw access to a couple of physical hard disks, and then having it share its file system with NFS so that Ubuntu can access it. I've never tried setting up KVM so that the virtual machine has access to physical drives. Does this sound feasible, and is there anything I need to watch out for? Has someone already documented something like this? Does Nexenta/ZFS function basically as well in the virtual environment as if they were running base bones? I can take a small performance hit, but I don't want it to not be as reliable because of the virtualization. Thanks.

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• Hide Drive / Avoid Low Diskspace Warning on ReadyBoost Cache?

  - by Simon Richter

  I've just added an SSD as a ReadyBoost cache drive, and have two minor cosmetic issues with it: the drive still shows up in the drive list I get a warning balloon every five minutes that the drive is full and that I should empty the Recycle Bin. The former is ignorable (and I guess I can solve it with a group policy); the latter is somewhat going on my nerves. Are there official buttons "hide ReadyBoost drives" and "do not warn on low diskspace for ReadyBoost drives" somewhere that I may have missed? If not, I guess I can use the group policy to hide the drive; I'd still need a way for the system to not warn about the drive being full. Also, am I right that I need to assign a drive letter and format the drive with NTFS to use it for ReadyBoost, or is there a way to just use the raw device?

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• Mailgun Is Not Detecting My New MX Records

  - by Tyler Crompton

  When I issue a DiG command to verify my MX records, I get the following output: $ dig example.com MX ; <<>> DiG 9.9.5-3-Ubuntu <<>> example.com MX ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 47700 ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 5 ;; OPT PSEUDOSECTION: ; EDNS: version: 0, flags:; udp: 4096 ;; QUESTION SECTION: ;example.com. IN MX ;; ANSWER SECTION: example.com. 85468 IN MX 10 mxa.mailgun.org. example.com. 85468 IN MX 10 mxb.mailgun.org. ;; REMAINDER OF OUTPUT REMOVED FOR BREVITY However, when I click "Check DNS Records Now" on Mailgun, it verifies the changes to the TXT and CNAME records but says that my MX records have not been changed. Type | Priority | Enter This Value | Current Value -----+----------+------------------+-------------------- MX | 10 | mxa.mailgun.org | 10 mail.example.com MX | 10 | mxb.mailgun.org | 10 mail.example.com I updated these records three to fours ago. I know it said to wait up to twenty-four to forty-eight hours. But I feel that if it detected the other DNS changes, then it should detect the MX record changes. Am I being impatient or is this a legitimate concern? What do you suggest I do? Note: I'd create a Mailgun tag for this; I feel that it'd be appropriate, but I don't have enough reputation to do so.

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• Default audio device gives an error on WINDOWS 7 (x64) when triing to run VLC from CMD (VideoLAN, VL

  - by Ole Jak

  I use WINDOWS 7 (x64) (Russian) I want to stream life audio from my default audio capture device (microphone) When I set up VLM settings using visual enviroment instruments - VLM settings it all works fine. But when I export created settings/configuration *.vlm file and try to inport it into VLM it gives me nothing I opened that .vlm there is some text... so now I try to run VLC with default settings like this: vlc -i dshow:// --dshow-adev= :sout=#transcode{acodec=mp3,ab=128,channels=2,samplerate=44100}:std{access=http,mux=raw,dst=127.0.0.1:8084} but it dies giving me errors...=( So what shall I do to do live MP3 streaming from my default audio input device using VLC in non UI mode?

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• Is there a clean way to tell Windows to release a volume?

  - by zneak

  Hey guys, I'm trying, under Windows 7, to run a virtual machine with VMWare Player from an OS installed on a physical partition. However, when I boot the virtual machine, VMWare Player says that it couldn't access the physical drive and has to abort there. This seems to be a generally acknowledged problem in the VMWare community, as Windows Vista introduced a compelling new security feature that makes it impossible to write to a raw drive without obtaining exclusive access to it. I have googled the issue and found a few workarounds. However, the clean ones seem to only work on whole physical disks, and not on partitions. So I would be left with the dirty solution. In short, it meddles with the MBR to erase any trace of the partitions to use, makes Windows forget about them, then restores the MBR so we can launch the VM. Is there a way to let VMWare acquire exclusive access to the partition without requiring me to nuke it away?

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• Repair Lacie 2Big Network 2

  - by Donier

  hi i buy from you Lacie 2big network 2 I was have problem with drive 2 "missed" then i try format HDD to mac os journal end RAW Now i can't connect to the device from network asistant please hep me I can't connect to Doshboard and i can't connect from USB on Lacie 2 big network 2device. I can connect to HDD from Lacie 2big network 2. how create lacie doshbaoard boot on HDD device. i format disks because one of HDD is work not correctly... in the Dashboard RAID menu disk 2 missed.... Thank you i wiil wait your answer....

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• Subdomain only accessible from one computer

  - by Edan Maor

  I recently added a wildcard A record to my domain (*.root.com), mapping it to a certain elastic ip on AWS. I've configured apache to redirect all references to something.root.com to root.com, except for one specific "dev" subdomain, which is hosting its own site (a Django app, specifically). The Problem: This setup works perfectly for me on my computer. But on other computers around the office, it doesn't seem to work. Specifically, trying to visit dev.root.com gives an "unable to find server" error. Pinging dev.root.com gives a "cannot resolve hostname" error. The weird thing: pinging any other subdomain of root.com does work, from all machines. I would think this was all due to DNS propagation, except all the computers are behind the same office router, so how could that be the case? Any ideas?

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• Dual HDD dual boot Win7/Win7 hibernate corrupts partitions?

  - by Ivan Zlatev

  I have two SSDs in my laptop. Both have 2 partitions each one with Windows 7 64bit and another one with OEM stuff on it (SYSTEM_DRV). I use the BIOS boot menu to boot between the drives. I have removed the drive letters so that no partitions of drive 1 are mapped in windows 2 on drive 2 and wise-versa. What I have observered however is that when I hibernate windows 1, boot windows 2 do some work and shutdown then resume windows 1 - the windows 2 partition will get corrupt quite often. Just happened actually - it is shown as "RAW" in the Disk manager instead of NTFS and windows will blue screen at boot. Alternatively I've seen cases where chkdsk will run and will wipe out all security descriptors making the partition completly unbootable. Why am I seeing these corruptions and what can I do to prevent them?

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• Optimal way to make MySQL backups for fairly large databases (MyISAM / InnoDB)

  - by WinkyWolly

  Currently we have one beefy MySQL database that runs a couple of high traffic Django based websites as well as some e-commerce websites of decent size. As a result we have a fair amount of large databases using both InnoDB and MyISAM tables. Unfortunately we've recently hit a wall due to the amount of traffic so I've setup another master server to help alleviate reads / backups. Now at the moment I simply use mysqldump with a few arguments and it's proven to be fine.. until now. Obviously mysqldump is a slow quick method however I believe we've outgrown its use. I now need a good alternative and have been looking into utilizing Maatkits mk-parallel-dump utility or an LVM snapshot solution. Succinct short version: I have a fairly large MySQL databases I need to backup Current method using mysqldump is inefficient and slow (causing issues) Looking into something such as mk-parallel-dump or LVM snapshots Any recommendations or ideas would be appreciated - since I have to re-do how we're doing things I rather have it done properly / most efficient :).

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• Sorting IPv4 Addresses

  - by Kumba

  So I've run into a quandary on sorting IPv4 addresses, and didn't know if there was a set rule in some obscure networking document. Do I do a straight sort on the raw address only (such as converting the IP address to a 32bit number and then sorting), do I factor in the CIDR via some mathematical formula, do I sort via the CIDR only (as if I'm comparing the network size and not the addresses directly)? I.e., normal math, we'd do something like -1 < 0 < 1 to denote the order of precedence. Given say, 10.1.0.0/16, 172.16.0.0/12, 192.168.1.0/24, and 192.168.1.42, what would be the order of precedence?

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• How do you monitor the health of a mirrored disk in Windows?

  - by NitroxDM

  I have a Mirrored Dynamic disk on my Windows 2003 Server. How do you monitor the health of the volume? Is there a way to have the server send an email when there is an issue with the volume? Is there a way to have the server run S.M.A.R.T. tests? EDIT: Nothing says WTF like logging into a client server, running DISKPART LIST VOLUME and seeing this. Volume ### Ltr Label Fs Type Size Status Info ---------- --- ----------- ----- ---------- ------- --------- -------- Volume 0 X xDrive NTFS Mirror 233 GB Failed Rd Volume 1 C NTFS Simple 57 GB Healthy System Volume 2 D DVD-ROM 0 B Healthy Volume 3 F RAW Partition 466 GB Healthy Volume 4 E New Volume NTFS Partition 932 GB Healthy

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• Error running Solr

  - by Jon H

  I'm trying to install Apache Solr for Plone, via collective.solr. I've followed the instructions above, and extended my buildout with: [buildout] extends = buildout.cfg https://github.com/Jarn/collective.solr/raw/master/buildout/solr.cfg [instance] eggs += collective.solr bin/buildout runs fine, however, when I try bin/solr-instance fg I get the following error: Traceback (most recent call last): File "bin/solr-instance", line 114, in <module> start(False) File "bin/solr-instance", line 43, in start stdout=logfp, stderr=logfp).pid File "/usr/lib/python2.6/subprocess.py", line 633, in __init__ errread, errwrite) File "/usr/lib/python2.6/subprocess.py", line 1139, in _execute_child raise child_exception OSError: [Errno 2] No such file or directory Graceful stop What am I missing / doing wrong?

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• Snow Leopard crashes my Xerox printer

  - by Ho Li Cow

  Just set up 2 brand new iMac 21.5" with OS X 10.6.2 pre-installed in our office. Now whenever we try to print an e-mail out, it re-sets the printer i.e. it switches off, does a POST and prints out a Printer Config page. I can print web pages and from other apps fine, just Apple Mail seems to be suffering. Printer is a Xerox Phaser 7750. I downloaded the drivers it recommended when i first tried printing which didn't help and then also tried downloading from the Xerox site. The latter seemed to install fine but then right at the end, it would say 'Installation Successful', then ask me to choose a printer (it found it fine, both by Bonjour and Raw TCP - i tried both) and then it would give an error message. Any help appreciated.

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• OARC's DNSSEC validating resolvers validate all my records but A records

  - by demize

  I have DNS set up with powerdns. It serves my DNS pretty well, and it AXFRs to other slaves. The slaves haven't yet updated to the most recent records, but that doesn't affect the validation, it would appear. Any record I can think of (AAAA, MX, TXT, even the CNAME for www) validates -- except for A records: dig @149.20.64.20 +dnssec www.demize95.com CNAME returns ;; flags: qr rd ra ad; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 7 while dig @149.20.64.20 +dnssec demize95.com A returns ;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 7. The same happens with any other A record I have. I set up DNSSEC with pdnssec, and it does work for all the other records, but it's never validated for my A records. What's the problem here? Also, a side-note: I have to use ISC's DLV to create the chain of trust, since my domain registrar doesn't yet support sending the DS records to the com zone.

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• Converting an ancient RH8 system to VMware ESXi

  - by donatello

  I am curious to know what options I have to convert a very old RedHat8 machine to a virtual one on ESXi. Looking at VMware Converter it seems there's an option to login to the RH8 using SSH, and from there it will convert to the ESXi-server. That makes me a bit nervous though, exactly what is happening there? The RH8 machine is slightly critical, and if anything messes up it'll likely result in many hours extra work. :( Another option I thought of was to boot a LiveCD on RH8-system and create a raw "dd dump" of the disk. The similar method is used to restore the image, I boot a LiveCD on the VM in ESXi and use "dd" to write it to disk. Is there any other option I could use? I'm using the cheap version of ESXi, hence I have no access to the Converter BootCD so these rather cumbersome methods is the only I can think of. :)

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• Unreasonably slow stunnel

  - by Kit Sunde

  I setup stunnel on OSX to tunnel traffic to my Django dev server because Facebook needs HTTPS these days but I noticed it's being absurdly slow. It seems like it can only handle a single connection at a time and even the connection is slow when I'm connecting to localhost. I've tried using some performance tips found online and so my config is setup as: pid= # foreground=yes cert=./cacert.pem key=./privkey.pem libwrap=no debug=0 socket = l:TCP_NODELAY=1 socket = r:TCP_NODELAY=1 [https] accept=8443 connect=8000 Is there a way to get more performance or more suitable way of setting up HTTPS for my dev server?

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• virtualbox 2 vmware disk

  - by anol

  I have a virtualbox disk I'd like to convert to a vmware disk. The disk is dynamic which makes it a lot more trickier. If I follow the instructions at http://xpapad.wordpress.com/2010/02/21/migrating-from-virtualbox-to-vmware-in-linux, the vdi-to-raw conversion will result in a 2 TB file. I don't even have that much disk space! The first step therefore seems to be a dynamic to static conversion of the virtualbox disk, right? How do I do that or is there perhaps a better way to convert to vmware? Help!

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• Why is the `remove rows` button not always present in MySQL Workbench?

  - by Shawn

  I'm using MySQL Workbench to remove rows from a table in my database. Most of the time, I will simply write a select statement, then select the rows I want to erase and use the remove rows button (circled in the screenshot below). But sometimes (quite often actually), the remove rows button does not appear. Instead, I get something like the screenshot below: The remove rows button is not there and the remove rows option is grayed out in the context menu, so basically, I can't remove rows... The only way I've found of solving this issue is to run the select query many times until the button appears (it usually does after 3 of 4 times). Does anyone know why this is happening? UPDATE Today, I've been running a select query dozens of times and the button never appears. It seems my incomprehensible workaround no longer works... Help! btw: Using a delete statement does work, though I would rather not have to write one for each row I want to remove as this happens quite frequently during development...

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• Redirecting a single request to another pages, ignoring www subdomain

  - by Petter Brodin

  I have a site running on IIS 7.5 that does an automatic redirect from 'http://mysite.com/whatever.aspx' to 'http://www.mysite.com/whatever.aspx' On the site, there is a lot of traffic to an old URL that I want to redirect to the front page, index.aspx: 'http://mysite.com/foo/bar/index.cgi%something=asdf&somethingelse=qwerty' The problem is that no matter what I try, I can only get the redirect to work with the www subdomain. If I use the URL without www, I just end up at 'http://www.mysite.com/404.aspx' Any ideas? Thanks in advance for all help! Edit3: it seems like the browser caching the redirect response was messing with me, so edit2 is wrong. See my response below. Edit2: disregard edit1, it doesn't seem like it's working after all. Edit: here's some further info: using this article I've managed to redirect from 'http://mysite.com/foo/bar/index.cgi' to 'http://www.mysite.com/index.aspx', but if I add the query string parameters, it still redirects to 'http://www.mysite.com/404.aspx' Isn't there a way to catch all requests to the cgi file, including query string parameters?

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• OSX Mail.app send only plaintext but read as html

  - by bawkstoo

  I get email which seems properly plaintext formatted, but when I forward it out, the font size ends up being enormous and a few other formatting stupidities. So I tried the following: defaults write com.apple.mail PreferPlainText -bool TRUE And this works great, all outgoing email regardless of the text original is plaintext only, just the way I like it. But now for incoming email only the plaintext portions are available to read without going into View - Message - Raw Source (or something similar to that). Does anyone know how I can force only outgoing mail to include only plaintext, but continue to read incoming mail in the formatting it was intended?

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• Software that will burn DVDs with a SFV or Pararchive file for each disc?

  - by Matt

  I'd like to burn several thousand RAW files (.DNG) of around 10-30 MB each to DVD to backup my photo archive. I'm looking for software that can do this and include an SFV-type file on each disc burnt. These are my requirements: compression is optional, and probably not desirable due to the extra time involved files should be spread amongst the discs as self-contained units, i.e. I don't want to have to load files from more than one disc to be able to read the files on that disc, so that excludes WinRAR's spanning options I don't want to spend time writing ISO images first as this will be a task I'll need to repeat often as I add new images to my archive - the software should write to the DVDs for me as simply as possible I'd like the SFV/Pararchive/recovery record to be stored with the files on each disc, so it only references the files on that particular disk Thanks in advance!

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• Why does a Remote Desktop Redirected Printer Doc appear every time I connect to Windows Server 2003 SBS?

  - by Jim Dagg

  I've run into a weird, persistent issue regarding a remote desktop connection. Every time I successfully log into a server running Windows Server 2003 SBS, without taking any further action, after a few seconds a print job spontaneously appears on my machine, titled "Remote Desktop Redirected Printer Doc". The document is 4K, datatype RAW, processor "WinPrint". I've heard of people running into this issue before, but can't seem to hunt down a coherent solution. It's a minor annoyance, but I get annoyed when Windows complains about a print job that, as far as I know, came from nowhere. Any thoughts on why this would occur and how I could prevent it from happening?

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