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• Clear / Flush cached memory

  - by TheDave

  I have a small VPS with 6GB RAM hosting a couple of websites. Recently I have noticed that my cached memory size is quite high - see below: Cpu(s): 0.1%us, 0.1%sy, 0.0%ni, 99.1%id, 0.0%wa, 0.2%hi, 0.4%si, 0.0%st Mem: 6113256k total, 5949620k used, 163636k free, 398584k buffers Swap: 1048564k total, 104k used, 1048460k free, 3586468k cached After investigating if there is some method to have this flushed or cleared I stumbled upon a command which is: sync; echo 3 > /proc/sys/vm/drop_caches I read it could be useful to add this to a chron-task/job. Is this method recommended or could this lead to potential problems? The only concern I have is that I use one Magento installation on Memcached - could this have any negative effects on it? I am certainly not a pro therefore I would very much appreciate some expert advise. PS: My VPS runs on CentOS 5 x64 and I have WHM + NGINX installed.

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• How to repair Java in Ubuntu after trying to switch to Java 6 using update-java-alternatives

  - by Kau-Boy

  I tried to switch from Java 5 to Java 6 using the "update-java-alternatives" command like explained on this page: https://help.ubuntu.com/community/Java But afterwards I get the following error when I tried to execute java: root@webserver:~# java Error occurred during initialization of VM Could not reserve enough space for object heap Could not create the Java virtual machine. I also tried to reinstall the java binaries using "apt-get" but I didn't succeed reinstalling it. I would like to post the "apt-get" errors, but unfortunately I don't know how to print out the error messages in English and not in German. My system is a Ubuntu 8.04 ROOT server.

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• Difference between ps output and top output?

  - by Soumya Prasad Ukil

  I find it difficult to understand the output produced by ps and top? This is the output by top: PID PSID USERNAME TID PRI NICE SIZE RES STATE TIME CPU COMMAND 26439 23712 soumyau 26439 15 0 7512M 5234M sleep 286:25 16.67% or_lse2 (18) 26523 23712 soumyau 26439 -2 0 7512M 5234M cpu9 143:10 8.33% or_lse2 26522 23712 soumyau 26439 -2 0 7512M 5234M cpu3 143:10 8.33% or_lse2 This is by ps (ps -L -p 26439 -o pcpu,psr,pid,user,tid): %CPU PSR PID USER TID 99.9 3 26439 soumyau 26522 99.9 9 26439 soumyau 26523 0.0 8 26439 soumyau 26439 Why are there differences in two result? Can you briefly explain the significance of the two CPU% ?

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• Convert color photos of documents to good black-and-white images?

  - by Norman Ramsey

  Since I don't have a copier or scanner, I'm using an 8 megapixel camera to copy documents. This works pretty well except they need a lot of processing afterward. I'd like to get from a photo to a bitmap, but using djpeg -grayscale -pnm photo.jpg | pgmtopbm -threshold -value XXX does not work so well, for two reasons: It's hard to guess what XXX should be, and XXX is different for different photos. Illumination varies, and sometimes a single threshold isn't what's right for the image. How can I do better? The ideal solution will be fully automatic command-line program that I can run on Linux. (I have already written a program to remove dark pixels from the edges of images.)

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• to measure throughput of testing device connect to server via AP

  - by samantha

  Description of project- I have a test tool to which DUT connects. The test tool has an access point in it and once DUT get connected to it via mac address we check RSSI and some other features of WiFi of DUT. Now I am wondering is there is any way I can measure throughput of Device under test via mac address of DUT from server side. Test-tool has LINUX fedora 11 in it and major coding is done in c/C++ and json command. Previously, I have tried to install ftp server on test-tool and DUT can connect to it and we can measure the throughput or data transfer rate, but this is not feasible solution as it requires lot of intervention from DUT. What I am interested in is 1) To run some script on server side /test tool and it gives me throughput of bandwidth of connected device may be via mac address of DUT OR 2) Server script transfer some files/packets to DUT and we can measure the throughput. Coding is not a major challenge at this stage , I just need some tool which requires minimum intervention from DUT.

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• Best filesystem for an external drive? ExFAT?

  - by GiH

  What is the best filesystem for use with multiple OS's? I saw this question but its old and doesn't take into account ExFAT. Here is what I know from my findings: NTFS - Can't write from Mac FAT32 - Doesn't support files larger than 4GB HFS - Only mac ExFAT - ??? I don't know much about this but it seems like it got rid of the 4GB limit of FAT32 and can be read on Windows, Mac, and Linux. Is ExFAT the best bet? I tried formatting the drive in ExFAT just now, but on Windows XP SP3 it was showing up as not formatted... It seems to me like FAT32 is still the best, but I wanted to see what other people had to say.

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• Setup a automatic server reboot on when a particular service fails

  - by user1179459

  I am running linux based server (centos 6.0) with cpanle and WHM, I have critical website running with a chat server which uses a openfire as the chat server backend server, i have monitored last few weeks this service crashes quite often, i have no way of knowing that, and i have to wait till the next day to restart the server. (and this can only be fixed by using server reboot as its got to do with some java memory problem) is there a way i can setup a monitoring service to the server and if this service goes down server itself will reboot ? is this something possible or is there a better way to overcome this problem ?

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• how to change VMWare 1.x guest boot order

  - by bo gusman

  I have 4 VMs on a linux host, call them A, B, C, D running on Z. I really don't care when A and B come up, but I would like to make sure that D comes up before C. I believe that in VMWare 2.x it's possible to change the boot order. Is this possible in 1.x as well? Is this done in /etc/vmware/vm-list? I see that there are a number of vms listed there, including some that have long since been deleted. Thanks! Bo

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• FBReader: How do I get it to display partial images?

  - by someguy

  I've been using FBReader so far for reading e-books, but my problem with it is how it handles images. Whenever there's an image, it isn't displayed until all of it can be displayed (i.e. it won't show if you haven't scrolled down far enough) and scrolling isn't smooth because the image is treated as one line. Is there a way to change this so that it displays the partially visible images? If there is not a way to change this, I am open to software suggestions to use as an alternative (I'm using Linux). I have already tried Calibre, but I find that it's too bloated. It takes ages to start up, and I don't want a directory for all my e-books...

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• What does dd conv=sync,noerror do?

  - by dding

  So what is the case when adding conv=sync,noerror makes a difference when backing up an entire hard disk onto an image file? Is conv=sync,noerror a requirement when doing forensic stuff? If so, why is it the case with reference to linux fedora? Edit: OK, so if I do dd without conv=sync,noerror, and dd encounters read error when reading the block (let's size 100M), does dd just skip 100M block and reads the next block without writing something (dd conv=sync,noerror writes zeros to 100M of output - so what about this case?)? And if is hash of original hard disk and output file different if done without conv=sync,noerror? Or is this only when read error occurred?

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• Howto maintain an EXT3 filesystem

  - by Reinoud van Santen

  Lately I had several servers which encountered a write error on an EXT3 filesystem and as a result of that remounted the filesystem read-only. Understandably on a production server this causes severe problems. On a reboot the filesystem where fixed but on large partitions this takes a lot of time. After the filesystem was fixed, correcting several errors, the server runs well again. What can I do to minimize the rate at which this happens? I can't seem to find much information on periodically checking the filesystem(s) on a running server. Is it possible to change the way in which EXT3 / the system handles write errors? What would be a sane solution. All servers which this is regarding to are running CentOS Linux 5.4 or 5.5.

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• Browser-based Operating System

  - by Ross Peoples

  I have a bunch of touchscreen machines that I want to display a webpage on and have users interact with the webpage via the touchscreen. Right now, this is done with a full-blown OS with a browser set to run at startup. I think maybe the ideal solution is to use a Linux-based OS that boots up, starts X, then starts a web browser (Chrome, Firefox, or whatever) in full screen mode. What kind of options do I have? I really want to avoid using a full-blown OS like I do now. It looks unprofessional and takes a while to boot up. I was thinking maybe Chrome OS or something, but I wouldn't know how to set it up for my purposes, since it's still designed to be used as a desktop OS instead of a kiosk-type OS.

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• How to control fan speed on Compaq Presario under Ubuntu?

  - by Josh

  I have a Compaq Presario R4000 running Ubuntu Linux 9.10 karmic. The system runs very hot and one of the fans is wither never running or always running at the slowest speed. For a while I thought the fan was dead but I just updated the BIOS (Phoenix BIOS) and during the update, that fan suddenly kicked in at full speed! How can I get that fan to spin up during normal usage? I have tried sensores-detect but all it found was k8temp, no fans... (SpeedFan under windows found no fans either)

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• May the file size returned by stat be compromised?

  - by codeholic

  I want to make sure that nobody changed a file. In order to accomplish that, I want not only to check MD5 sum of the file, but also check its size, since as far as I understand this additional simple check can sophisticate falsification by several digits. May I trust the size that stat returns? I don't mean if changes were made to stat itself. I don't go that deep. But, for instance, may one compromise the file size that stat returns by hacking the directory file? Or by similar means, that do not require superuser privileges? It's Linux.

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• Move all images in folder to subfolder, and update all references to those images to their new location?

  - by Professor Frink

  I have a folder which contains a ~50 text files (PHP) and hundreds of images. I would like to move all the images to a subfolder, and update the PHP files so any reference to those images point to the new subfolder. I know I can move all the images quite easily (mv *.jpg /image, mv *.gif /image, etc...), but don't know how to go about updating all the text files - I assume a Regex has to be created to match all the images in a file, and then somehow the new directory has to be appended to the image file name? Is this best done with a shell script? Any help is appreciated (Server is Linux/CentOs5) Thanks!

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• Suphp connection reset by peer in error logs

  - by trante

  In my Linux server's logs I have this record nearly every 5 minutes. I couldn't find the reason for two weeks and I would be very happy if you can recommend me a way to diagnose the problem. It is inside error_log file. I use php 5.3.8 and litespeed. 2012-09-03 16:01:28.399 [INFO] [95.7.223.91:63814-0#APVH_example.com] connection to [/tmp/lshttpd/ APVH_example.com_Suphp.sock. 781] on request #151, confirmed, 0, associated process: 845244, running: 0, error: Connection reset by peer!

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• How to get a maximum file size of VZFS parition?

  - by Nulldevice

  I have a VPS hosting with a VZFS file system. How can I determine maximum file size of VZFS partition? UPD: Free space (or total space) is not what i need. Sometimes file cannot occupy a hole partition volume - fat16 with 2Gb limit is a good example. I need to use a large database file (say, 64Gb) and so I need to know if a file system of VPS hosting will cope with it. It is easy to calculate for an ext3 filesystem using tune2fs, but VPS uses VSFS by Virtuozzo, and it is documented bad. Is it any generic way to calculate maximum file size for some filesystem in linux?

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• Best practices to avoid Jenkins error: sudo: no tty present and no askpass program specified

  - by s g

  When running any sudo command from Jenkins I get the following error: sudo: no tty present and no askpass program specified I understand that I can solve this by adding a NOPASSWD entry to my /etc/sudoers file which will allow user jenkins to run commands without needing a password. I can add an entry like this: %jenkins ALL=(ALL)NOPASSWD:/home/vts_share/test/sudotest.sh ...but this leads to the following issue: how to avoid specifying full path in sudoers file? I can add an entry like this: %jenkins ALL=NOPASSWD: ALL ...but this allows user jenkins to avoid the password prompt for all commands, which seems a bit unsafe. I'm just curious what my options are here, and if there are any best practices I should consider.

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• Conference Calling Meetme.conf PROBLEM - Astarisk

  - by Zafer

  I am facing problem in conference calling (OS ubuntu latest) ... I created a conference Room and an extension no .. when i dial from my softphone (3cx or X-Lite) it says "YOU ARE ENTERING CONFERENCE NO 1234. YOU ARE CURRENTLY THE ONLY PERSON IN THE CONFERENCE) and then a music for a second and then shows connected... Now when i dial form another soft phone the same extension it goes to second conference room and plays the same message .. if i create only one conference room .. the second no. didn't connect to it and says no conference room. CAN some one help me out .... I just want to create a conference room OR extension where 4-5 or 6 people can call and make a conference ... i am not very much expert in linux and asterisk so simple steps to achieve my goal .. Thanks

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• how to take a backup of ubuntu system as it is?

  - by rajat

  I have installed ubuntu(dual boot) using wubi(Windows-based UBuntu Installer) installer for windows , and since then i am working in linux now it has many projects with many dependencies now i want to install the same ubuntu to other machines ,so that i don't need to install Ubuntu first and then install each and every project and it's dependencies . There is a folder called ubuntu in my windows driver which was created by wubi and which has all the ubuntu stuff . PS: Other machines have only windows 7 installed and have same configuration . Is there any way to install the save ubuntu i am using to the other machines ?

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• PHP Mail Relay via Remote smtp Server

  - by Toqeer

  We have a php application running on Linux which sends emails to there users. Currently its setup like php.ini is configured to send via local sendmail server but we have separate mail server for our organization for this domain. I want to send the php application emails via that remote smtp server so these emails can have the correct SPF records and sign via DKIM. But I could not see such option in php.ini to specify the remote host address to forward emails to that, its for windows only. I saw some post which suggest phpMailer but I could not find how to configure that so all our php application could send via our remote SMTP.

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• My datacenter is unable to add PTR/rDNS record, then how can I prevent the mail outgoing from going to spam folder?

  - by gilzero

  I am having problem that mail sent out from my server all goes to recipient's spam folder. I am running Drupal sites on Linux server. CentOS w/ cPanel. Our users cannot receive email as the mail went to the spam folder. (such as registration email, contact form email) I was advised that I need to have PTR/rDNS record added for my host. I then contact my datacenter to add PTR/rDNS thing, unfortunately, the datacenter said they are unable to do it. So what can I do? Any other ways I can fix the problem? Thank you!

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• Global hotkeys: songbird on KDE

  - by alpha1

  I'm running songbird on opensuse 11.2 KDE 4.3.1 on my EEE pc. On windows, there is a hotkey thing inside Songbird, so i set META F9,10,11,12 as media keys and it work just fine. On linux, there is not hotkey thing in songbird, and I would like to set those same hotkeys. I've played around with the Amarok Hotkeys, which are now setup that way, and looked in all the KDE shortcuts, but cannot find a way to add a new program and new hot keys. I know its possible, I did it before once, but the KDE shortcut programs have changed and I no longer see the stuff i used to do it before. I'd like to do the same to banshee at some point, but Songbird is the important program. Any Ideas? Any way to set those keys to generic media buttons?

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• Using a 3g usb dongle as Cisco router access point

  - by beakersoft

  We have an office opening, and we aren't going to have comms into the building when management want the building to open. Our only option (I think) Is to try and hook up a 3/4g dongle to something to act as the access point, and send all the traffic via that. The model of router we use wont support the usb dongle, so we need some sort of 'bridge' My idea was to build a Linux box, plug the dongle into that and then via the Ethernet ports plug the router in. We need the Cisco router in the equation as we create VPN connections over that back to head office. My question is will this work?

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• How do you manage updates without a staging environment: CentOS 6.3

  - by Gregg Leventhal

  I am managing about 20 servers, many of them virtual. They are almost all different purpose, and none are clustered. I have a distributed LAMP stack, a few application servers, some build servers, a few KVM hosts. They are CentOS 6.3 mostly with a few Ubuntu (unfortunately). I don't have the resources to setup a staging environment where I can have duplicates of my machines and test updates before rolling them out. I am taking file backups. What I want to know is how you are approaching backing up your Linux systems. I assume you don't just do yum update, but then how are you choosing the packages worthy of updating? When (if ever) are you updating the kernel, etc.. How do you test updates without a staging environment? Snapshot and hope for the best?

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