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• How to use supervisord to run a PHP script as a daemon?

  - by Alasdair

  I need to have 8 threads of the same PHP script running in the background on a server continuously (as a daemon), and each script need to be automatically restarted if it exits for any reason. I've been advised to use supervisord to do this, but I don't at all understand their documentation, which seems very complicated to me. I also want each of the 8 threads of the script to be initially started at 2 minute intervals (2 minutes in between each launch) but then after this all 8 threads of the same PHP script should continue running on the server forever (and restarting if any exit for any reason). Could someone please explain how to do this with supervisord, or any other easy way of doing it? I'm on CentOS 6. Thank you!

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• How to make the start menu finds a program based on a custom keyword?

  - by Pierre-Alain Vigeant

  I am searching for a way to type a keyword in the start menu Search programs and files field and that it will return the application that match the keyword. An example will better explain this: Suppose that I want to start the powershell. Currently what I can type in the search field is power and the first item that appear is the 64bits powershell shortcut. Now suppose that I'd like ps to return powershell as the first item of the search list. Currently, typing ps return all files with the .ps extension, alongs with a control panel options about recording steps but not the powershell executable itself. How can I do that?

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• Sync files between Mac, PC and Linux automatically

  - by Siriss

  Hello everyone- I have a MacBook Pro, a Windows 7 desktop, and a Fedora 13 netbook. I have been searching far and wide for an automatic solution to sync files (pictures, music, docs, etc...) between the three when they are all on the same LAN. To better explain, when I get home and turn my MacBook on, I want it to sync automatically any file changes to Windows 7 and the netbook. Likewise if I make changes on my Windows 7 box, I want them to be reflected on my Mac. I can use rsync, but it is not automatic as far as I can tell, and I would use Dropbox but I have a lot more that 2 gigs and do not want to pay. I also do not need internet syncing. I just want local LAN. Does anyone have any ideas? Thank you very much in advance.

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• Root access on media temple.com dv server

  - by Chris M

  This may be a dumb question. I just purchased dv access at media temple.com. I set up root access as required, set up a root access password. Now, for the life of me I can not figure out how this password gets used. Everywhere i try to use the password it does not work. Even tried to ssh with Putty and that didnt work either. Can somebody possibly explain to me what this root access is and how I use it. Im a newbie just trying to learn something new.

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• How do I use wine's new multi-channel audio support?

  - by Forest

  Wine supposedly added Multi-channel support to the ALSA driver in a recent release. However, I haven't found any documentation about it or any reports of anyone successfully using it. I have 5.1 surround sound through ALSA (not Pulse) on my linux system, yet games in wine don't seem to use anything more than stereo, no matter which ALSA device I select in winecfg. Can someone explain what must be done to get wine games to use all my speakers for positional audio, or failing that, point me toward some useful documentation on the new multi-channel support?

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• Memory usages in Linux drops frequently

  - by FunkyChicken

  I run a CentOS 5.6 (64bit) machine that has Nginx (latest version) running, with php-fpm (latest version). Things run very well, but since about 2 weeks I noticed in my Munin graphs that about every 2 hours the 'cache' usages drops. Before it used be a steady fully graph, that didn't seem to reset every so often. PHP-FPM settings: pm.max_children = 300 daemonize = yes pm = static listen = /tmp/fpm.sock pm.max_requests = 1000 I have checked the php-fpm.log, and about once per 5 seconds a child process is killed, and restarted. But this is all the time, so this does not explain the sudden drops. I only run Nginx, PHP (via fpm), Munin and vsftpd on this machine. No crons run at exactly the time of the drops. My question: What could be causing these drops in cache usage?

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• directory listing on Mac OS X

  - by user27150

  I dumped a bunch of files (music and otherwise) onto my shiny new Macbook, and since I'm more comfortable with linux than Mac (at this point) I tend to use the terminal. I did a ls -al on the files I'd transfered, and some had an "@" at the end of the permissions string, and some did not. Something like: drwxrwxr--@ 93 user staff etc. drwxrwxr-- 107 user staff etc. The ones without "@" could be seen in Finder and accessed by other programs-- the "@" files and directories were invisible. Can anyone explain what the "@" means, and how to chmod (or whatever) so I can use these files? I assume it is some sort of system flag but I don't know how to unset it. Chmod 777 had no effect and I already own the files. Thanks

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• SQL Server "Long running transaction" performance counter: why no workee?

  - by Sleepless

  Please explain to me the following observation: I have the following piece of T-SQL code that I run from SSMS: BEGIN TRAN SELECT COUNT (*) FROM m WHERE m.[x] = 123456 or m.[y] IN (SELECT f.x FROM f) SELECT COUNT (*) FROM m WHERE m.[x] = 123456 or m.[y] IN (SELECT f.x FROM f) COMMIT TRAN The query takes about twenty seconds to run. I have no other user queries running on the server. Under these circumstances, I would expect the performance counter "MSSQL$SQLInstanceName:Transactions\Longest Transaction Running Time" to rise constantly up to a value of 20 and then drop rapidly. Instead, it rises to around 12 within two seconds and then oscillates between 12 and 14 for the duration of the query after which it drops again. According to the MS docs, the counter measures "The length of time (in seconds) since the start of the transaction that has been active longer than any other current transaction." But apparently, it doesn't. What gives?

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• "Fast link detected" warning in GP management console

  - by ???????? ??????

  There is a message that is shown in every report i make in Group Policy Results section of Group Policy Management Console, saying that "A fast link is detected". I followed the link in the waring, but after I read the page several times, I concluded, that I can ignore the warning. However, I noticed that the group policies are not applied when security filtering is used untl "gpupdate /sync" is executed... Is this related to the fast sync? In general, can somebody explain me the consequences of fast links briefly?

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• How Does Failover Clustering Work in Windows 2008 R2?

  - by Kyle Brandt

  I am trying to learn how the failover clustering features works with Windows 2008 R2 as I am going to be using as part of SQL Server 2012 always on. I have been able to find information on how to set it up, and what it does. However, I am having trouble finding a nice technical document on how it actually works in detail (For example with keepalived there are docs that explain how often are heartbeat packets sent, what they look like etc). I know this is a pretty broad question, but I would like to have a good understanding of mechanisms of this feature.

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• MySQL dump, output each table row on a new line whilst using --extended-insert

  - by soopadoubled

  I'm having an issue, where for ease of use, I'd like to be able to format a command line MySQL dump so that each row of a given table is on a new line when using the --extended-insert option. Usually when using --extended-insert, every row of a given table is outputted on one line, and as far as I am aware there's no way to change this, other than post-processing the dump with perl or such like. The format I'm looking for is: -- -- Dumping data for table `ww_tbCountry` -- INSERT INTO `ww_tbCountry` (`iCountryId_PK`, `vCountryName`, `vShortName`, `iSortFlag`, `fTax`, `vCountryCode`, `vSageTaxCode`) VALUES (22, 'Albania', 'AL', 1, 0.00, '8', 'T9'), (33, 'Austria', 'AT', 1, 15.00, '40', 'T9'), (40, 'Belarus', 'BY', 1, 0.00, '112', 'T9'), (41, 'Belgium', 'BE', 1, 15.00, '56', 'T9'), (51, 'Bulgaria', 'BG', 1, 15.00, '100', 'T9' However, when I dump a database using Phpmyadmin, using --extended-insert, each row is dumped on a new line (as shown by the example above). I've gone through Phpmyadmin and can't find any documentation that would explain this. Is anyone able to shed any light on this? Thanks in advance, Ian

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• Understanding Zabbix Triggers

  - by Mediocre Gopher

  I have zabbix set with an item to monitor a log file on a zabbix client: log["/var/log/program_name/client.log","ERROR:","UTF-8",100] And a trigger to determine when that log file get's more ERRORs: {Template_Linux:log["/var/log/program_name/client.log","ERROR:","UTF-8",100].change(0)}#0 This trigger gets tripped when the log file gets ERRORs the first time, but then that first trigger just sits around for ever in Monitoring-Triggers. My understanding is that the next time the server checks the value of log["/var/log/program_name/client.log","ERROR:","UTF-8",100] and sees that it hasn't changed that the trigger would go away. Obviously this isn't the case. Could someone explain why this first trigger isn't going away? Ultimately my goal is to receive an email whenever ERRORs are added to that log file, but I would like to understand how triggers are working first.

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• Why not open a PDF file in the browser but first save it to the harddisk?

  - by Lernkurve

  Question Is it correct that saving a PDF to the harddisk first, and then opening it from there with some PDF reader (not the browser) is safer than opening it directly with the browser plugin? My current understanding I know that the PDF browser plugin might have a security leak and a manipulated PDF file might exploit it and get access to the user's computer. I recently heard that saving the PDF file frist and opening it then was safer. I don't understand why that should be safer. Can anyone explain? My logic would suggest that a manipulated file started from the harddisk can just as well exploit a security leak, say for instance, of Adobe Acrobat Reader.

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• What is Openflow?

  - by jmreicha

  Okay, I've been thinking about this a lot recently but I think I may be more confused now than I was originally when I started. I can't find anything about Openflow that helps me understand what it is. None of the websites I have found have given a solid definition of what Openflow really is and what it does, at least if they do I can't comprehend it. Is there an easy way to explain this standard so my small brain can understand it? I understand that Openflow is a way to abstract networking away from switches and can be managed from software, etc etc. I feel like it might be a little easier to grasp if I had exmaples of application. But so far searching has failed me. What is Openflow? How can it help me? What does it offer?

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• Why subnet mask for IP 10.0.1.4 is 255.255.255.0?

  - by Rohit Kandhal

  Well I'm not sure whether I'm missing something here. But all I've read is that if first octet of IP is within 0 - 127 then it is categorized as Class A subnet and correspondingly Subnet Mask for this is 255.0.0.0 but when I connect my system to Apple airport then my system gets IP as 10.0.1.4 however subnet mask is 255.255.255.0 not 255.0.0.0. Please explain what I'm missing here. If there is something like for apple router subnet mask is calculated on some different flags then please let me know.

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• PCI compliance - Setting BIND to no recursion, cURL can't access external sites

  - by Exit

  I was running a PCI scan and was following direction to change the BIND options from: // recursion no; allow-recursion { trusted;}; allow-notify { trusted;}; allow-transfer { trusted;}; to: recursion no; allow-recursion { none;}; allow-notify { trusted;}; allow-transfer { none;}; The end result was that cURL operations stopped being able to access external sites. I realize that not everything will be 100% for PCI compliance, but can someone explain if there is a way to balance this for both PCI compliance and function?

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• RDMA architecture - do you need adapters on both ends?

  - by Bobb

  I know Linux can use RDMA NICs like Solarflare... I just found Intel has something like that NetEffect cards. But Intel is talking all about clusters.. Can someone please explain. If I want low-latency networking and install RDMA NIC on my server. Is there limitation on where the cable can go? Is there a specific device expected on the other end? Is it special RDMA switch or RDMA adapter before switch or what? Why is this cluster talk? What if I want a single server with Windows (I can install HPC Windows or Windows 2008 R2)?

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• Aspect Ratio on Nero 9 for burning DVD

  - by Tara

  I am currently attempting to burn a screen capture file to DVD. I will admit that I know very little about the process, the terminology, and am at a loss of how to find this information. I am using Nero 9 and am very displeased that the manuals available to me online explain very little. My current problem is that when I burn to DVD, my beautiful screen capture ends up being cropped. Through endless amounts of googling I am under the impression that this is due to aspect ratio. However, as windows will not tell me the resolution size for me to determine the correct aspect ratio I do not know how to proceed. Is there a way using Nero 9 for me to be able to burn my screen capture to DVD? Any advice or suggestions are appreciated.

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• Varnish Running VCC-compiler failed on purge

  - by FLX

  I've been following this guide which uses this default.vcl. However, when starting Varnish I get the following error: * Starting HTTP accelerator [fail] storage_malloc: max size 1024 MB. Message from VCC-compiler: Expected '(' got ';' (program line 341), at (input Line 43 Pos 22) purge; ---------------------# Running VCC-compiler failed, exit 1 VCL compilation failed Which means that there is something wrong with purge here: sub vcl_hit { if (req.request == "PURGE") { purge; error 200 "Purged."; } } I don't see anything wrong, can someone explain? Thanks!

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• Cannot run setups from a mapped network drive on Windows 7

  - by Dimitri C.

  I'm trying to run an application setup by double-clicking the setup.exe from within Windows Explorer. The file is located on a mapped network drive, and I'm using Windows 7. This results in the following error message: The specified path does not exist. Check the path, and then try again. The workaround I found is to copy the installer to the main hard drive (c:) and run it from there; however, this is rather inconvenient. The same action did work on Windows 2000, Windows XP and Windows Vista. I have the impression that the problem only occurs with installers, as everything seemed to work fine with regular exe's. Is there anyone who can explain this odd behavior?

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• 3Proxy with Rotating IP's

  - by ramesh.mimit

  I want to configure a proxy which can rotate the IP's on session basis. Let me explain what I have done so far and what is exact requirement. I installed 3 proxy configured it to listen on 10 Public interfaces which is working fine. But my requirement is if any user access the internet, IP which will go out should be changed for every new session. Lets say my prxy IP's are from 10.20.30.5-14. When an user opens google.com it will hit google webserver with 10.20.30.5 IP and now if same user opens up yahoo.com then, it should it with 10.20.30.6 or any ip b/w 6 to 14. Is this possible?

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• Optimized CSF LFD to miminize false positive emails on new install? Centos6.2 + ISPConfig3

  - by Damainman

  I have a remote dedicated server running CentOS 6.2 x64bit with ISPConfig3. This is a brand new install. Server Purpose: Basic LAMP Web Hosting with PureFTPD, BIND, CLAMAV, RKHunter. Any advice or link to a guide which will clearly explain how to optimize the CSF+LFD configuration is greatly appreciated. I am not exactly sure on where to start what I shouldn't loosen the restrictions on. At the moment my inbox is flooding with alerts from LFD such as: Suspicious process running under user postfix Excessive resource usage: haldaemon Account: haldaemon Resource: Process Time Exceeded: 1823 1800 (seconds) Executable: /usr/sbin/hald Command Line: hald PID: 1031 Killed: No Excessive resource usage: amavis Time: Tue Jun 5 12:43:35 2012 -0700 Account: amavis Resource: Virtual Memory Size Exceeded: 330 200 (MB) Executable: /usr/bin/perl Command Line: amavisd (virgin child) PID: 27931 Killed: No Excessive resource usage: apache Time: Tue Jun 5 12:35:33 2012 -0700 Account: apache Resource: Virtual Memory Size Exceeded: 437 200 (MB) Executable: /usr/sbin/httpd Command Line: /usr/sbin/httpd PID: 27286 Killed: No

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• Why is business-class storage so expensive?

  - by Mark Henderson

  This is a Canonical Question about the Cost of Enterprise Storage. See also the following question: What's the best way to explain storage issues to developers and other users Regarding general questions like: Why do I have to pay 50 bucks a month per extra gigabyte of storage? Our file server is always running out of space, why doesn't our sysadmin just throw an extra 1TB drive in there? Why is SAN equipment so expensive? The Answers here will attempt to provide a better understanding of how enterprise-level storage works and what influences the price. If you can expand on the Question or provide insight as to the Answer, please post.

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• OS X Headphone jack issue [closed]

  - by Alex Coady

  Possible Duplicate: Optical Audio out stuck on on a MacBook When I plug my headphones into my iMac (27-inch, Mid 2011; OSX 10.8.1) and try to adjust the volume, the volume popup shows a greyed out speaker and there's a circle with a line through it signalling that it isn't working. I've tried the headphones with my iPhone, other iMacs etc and they're fine. This is incredibly frustrating. Other headphones don't generally work either. In Sound preferences the headphones are being listed as "Optical digital-out port" which is incorrect and would explain the problem, but doesn't help me fix it. Any ideas?

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• OS X Lion: Emptying the trash takes "forever": is using rm -r safe?

  - by EOL

  Emptying my Trash in OS X Lion (non securely) is taking about three hours (about 1.5 million files, from a Time Machine backup). I had to stop the process a few times already, because I could not move my laptop with the external harddrive the files are on. This is also a problem because the Trash emptying is restarted from the very beginning each time I empty the Trash again (i.e., files are not deleted when the Trash emptying is aborted). I read that it is faster to use rm -rf on ~/.Trash, in this case. However, is this safe? (I am afraid that does OS X Lion performs tasks behind the scenes—which would explain its slowness—that rm -r does not, which could lead to problems in the future.)

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