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• Linux: Limiting data throughput (pipe) in bytes per second?

  - by sdaau

  Hi all, I was wandering if there is a Linux program that can limit data throughput of a pipe - in actual bytes per second?. From what I gather, applicable for the purposes would be bfr, however, it has been removed from Debian (Removal candidate: bfr) cpipe, however, it seems the lowest resolution it will support is kB/s, meaning that buffer writes can still reach MB/s ([SOLVED] Is there a program to limit terminal pipe speed? - Page 2 - Ubuntu Forums) What I'd want is to be able to specify something like cat example.txt | ratelimit -Bps 100 > /dev/ttyUSB0 ... and actually have a single byte from example.txt sent each 1/100 = 0.01 sec (or 10 ms) to 'output'.. Thanks in advance for any suggestions, Cheers!

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• Software RAID 1 broken, how do I fix this?

  - by Edward

  I'm running CentOS 6 x86_64. There is a software RAID 1 being used on the two internal 80GB drives. I got the following e-mail sent to me: A DegradedArray event had been detected on md device /dev/md1. Faithfully yours, etc. P.S. The /proc/mdstat file currently contains the following: Personalities : [raid1] md0 : active raid1 sda1[0] 511988 blocks super 1.0 [2/1] [U_] md1 : active raid1 sda2[0] 8190968 blocks super 1.1 [2/1] [U_] bitmap: 1/1 pages [4KB], 65536KB chunk md4 : active raid1 sdc1[0] sdb1[1] 1953512400 blocks super 1.2 [2/2] [UU] md3 : active raid1 sdd5[1] sda5[0] 61224892 blocks super 1.1 [2/2] [UU] bitmap: 1/1 pages [4KB], 65536KB chunk md2 : active raid1 sdd3[1] sda3[0] 8190968 blocks super 1.1 [2/2] [UU] unused devices: <none> The system appears to have booted fine and is working. The two drives' content did not change at all. I only removed and reinstalled them while I was booted on the CentOS Live DVD. How do I get the array working again?

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• How do I start mysqld with options

  - by xiankai

  I need to start up mysqld with command line options as from here: http://dev.mysql.com/doc/refman/5.1/en/server-options.html#option_mysqld_skip-grant-tables I normally do sudo service mysqld start, but passing the option as sudo service mysqld start --skip-grant-tables does not seem to work. Alternatively I have tried starting as a daemon, sudo mysqld_safe --skip-grant-tables & But it seems to terminate too soon: 131101 04:59:57 mysqld_safe Logging to '/var/lib/mysql/vagrant.example.com.err'. 131101 04:59:57 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 131101 05:00:03 mysqld_safe mysqld from pid file /var/lib/mysql/vagrant.example.com.pid ended My last option seems to specify the option in /etc/my.cnf instead, but is there any way to do it via the command line?

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• What methods are there to configure puppet to serve resources for multiple environments?

  - by cclark

  I seem to come across two ways for using puppet in multiple environments: 1) Install a puppetmaster in each environment and only update the recipes from source control for that environment when ready to deploy the recipes in that environment. 2) Use one puppetmaster and use a variable in the puppet.conf of each client to specify the environment and then in the puppetmaster specify a different modulepath for each environment and each of those paths is updated to the branch of the recipe repository intended for that environment (e.g. dev, staging, production). Only running one puppetmaster seems like it is one less piece of infrastructure to keep running but there is some additional complexity in the configuration. Are there additional pros or cons to one of these methods or something which I'm missing entirely?

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• How to partition a 1 TB drive for performance on a windows development machine?

  - by dip

  I saw a similar question for linux, but nothing for windows. I'm getting a new 1TB drive for my dev box @ work. The OS will be Windows 7 Pro with 8GB of RAM and just the single 1TB drive. Backups are not a concern, and I won't be storing large multimedia files. I want the fastest possible performance for general windows usage and for compilation. I will defrag nightly with a smart defragger liker perfectdisk. Should I just go with a single partition, or is there some way I can lay things out for the best performance?

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• MySQL 5.0 Unavailable but still working every monday morning

  - by user1578031

  So I have a MySQL server with 4-5 databases and every monday morning, I can't login with PHPmyAdmin or the cmd line tools or options and the funny thing is the connection can be made later in the day around 3:30 - 4PM. I can't replicate the issues on any dev boxes and cant upgrade to 5.5 for a number of reasons. I want to try and poll the sql databases with a simple script and just connect to it and then disconnect. I'm not very good with SQL but would like to know if anyone could help with a script which I can automate to run sunday every 30mins or so, to see if the issue can be stopped by the database being connected to over the very quiet period of sunday... After this im out of ideas and have to wait for the HW/SW refresh to get 5.5 on there...

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• Virtualbox, merging snapshots and base disk

  - by Henrik

  Hi, I have a virtual machine with about 30 snapshots in branches. The current development path is 22 snapshots plus the base disk. The amount of files is seemingly having an impact now on IO and the dev laptop I'm using (don't know if it is host disk performance issues with the 140GB total size over a lot of fragments, or just the fact that it is hitting sectors distributed across a lot of files). I would like to merge the current development branch of snapshots together with the base disk, but I am unsure if the following command would produce the correct outcome. I am not able to boot this disk after the procedure completes (5-6 hours). vboxmanage clonehd "C:\VPC-Storage\.VirtualBox\Machines\CRM\Snapshots\{245b27ac-e658-470a-b978-8e62137c33b1}.vhd" "E:\crm-20100624.vhd" --format VHD --type normal Could anyone confirm if this is the correct approach or not?

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• Set Thunderbird "from" address by incoming "to" address

  - by user293698

  I have configured my email server to cache all email to my mailbox. So [email protected] and [email protected] go to one mailbox. Every forum, registration, and guy get their own address for sending me emails so I can deliver it to /dev/null if anyone start spamming. That's the working setup. Now the problem: If I reply to a message, then Thunderbird always sets my default Identity as sender. I know I can add additional identities, but I don't want to add every address. How can I configure when a email is sent to [email protected], I answer with [email protected].

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• Can expire_logs_days be less than 1 day in MySQL?

  - by Scott

  So... yesterday I received an "after the fact email" about a campaign that has started for one of the services that I run. Now the DB server is getting hammered, hard, to the tune of about 300mb/min in binary logging for the replicate. As you could imagine, this is chewing up space at a fairly tremendous rate. My normal 7 day expiry of binary logs just isn't cutting it. I've resorted to truncating logs to just the last for 4 hours with(I'm verifying that replication is up to date with mk-heartbeat): PURGE MASTER LOGS BEFORE DATE_SUB( NOW(), INTERVAL 4 HOUR); I'm just running that from cron every few hours to weather the storm, but it made me question the minimum value for expire_logs_days. I haven't come across a value that is less than 1, but that doesn't mean that it isn't possible. http://dev.mysql.com/doc/refman/5.0/en/server-system-variables.html#sysvar_expire_logs_days gives the type as being numeric, but doesn't indicate if it's expecting integers.

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• Add a right click context menu in certain WIndows folders that will open a web browser URL?

  - by jasondavis

  In a Windows Explorer window where you browse files in Windows 7, I would like to add a new context menu that will allow me to open a file on my local Dev Server. So it would have to open a browser like Google Crome and the URL would have to be the file path but slightly different removing part of it and prepending my localhost URL. For example if the file I am right clicking on, the path for that file might be... E:\Server\htdocs\labs\php\testProject\test.php I would need a button to click in the context menu Open in Browser and it would open my Web Browser with a URL like this... http://localhost/labs/php/testProject/test.php I would love to be able to do this, any ideas or help would greatly be appreciated! To go one step further, would to be able to somehow make the context menu item only show up on File that are under this folder.... ``E:\Server\htdocs` but this is far less important.

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• Make Google Chrome "Application" Windows Use High-Quality Icons in Windows 7

  - by The How-To Geek

  Whenever I use Google Chrome's "Create Application" shortcut (which I heavily use, and recommend), the icons shown on the Windows 7 taskbar are really blurry, probably the result of the 16x16 favicon being stretched out. I'd like to be able to replace these with another, high-quality icon, but even when I replace the cached file, it doesn't update for some reason. For reference, here's the path to the icon, for Gmail, at least. I'm also using the latest Dev channel version of Chrome. %USERPROFILE%\AppData\Local\Google\Chrome\USERDA~1\Default\PLUGIN~1\GOOGLE~1\mail.google.com\https_443\icons#desktop\

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• Permission denied when trying to execute a binary burned to a CD-R

  - by user16654

  On an Ubuntu 9.10 (Karmic Koala) machine, I burned a CD from the command prompt using: cdrecord -v speed=16 dev=0,1,0 /FPS.iso The CD now contains an executable and some files. I tested the CD by loading it onto another machine (Red Hat 5.3) and when I try to run the program I get the following message: bash: ./FPS1_1: Permission denied I can open other files like text documents (the executable also comes with shared libraries). I realized I had burned the CD as root so I burned another one as another user but I still have the same problem. How can I remove this permission or what is the problem? P.S. the image was in / if that helps

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• xl create doesn't bring up console

  - by ineff

  I've tryed to run VM in Xen 4.2 using xl command (for what I get this should be standard toolstack, while xm is deprecated). In this case I've the following configuration file kernel = '/media/home_separata/domU_kernel/boot/vmlinuz-linux' ramdisk = '/media/home_separata/domU_kernel/boot/initramfs-linux.img' name = "domU_Arch_linux" memory = "512" root = '/dev/xvda1 ro' disk = ['file:/media/home_separata/domU_kernel/arch_linux_kernel.img,xvda1,w'] vif = ['mac=aa:::10:11:f1,ip=192.168.0.2,bridge=xenbr0'] when I try to start the virtual machine with xl create it seems it works (it also bring up the vif interfaces) but if I try to connect via xl console it gives an error: xenconsole: Could not read tty from store: No such file or directory the fun fact is that the I've the problem inverse using xend/xm (in that case xend doesn't bring up vif interfaces but activate console). Does anyone have any suggestion?

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• Simplification of Apache+Subversion multidirectory configuration

  - by Reinderien

  Hello. With your excellent advice, I've finally pieced together this functional Apache configuration for my Subversion service: # Macro to make an SVN repo set <Macro SVNDir $user> <Location /svn/$user> # Mandatory HTTPS, log in using Active Domain SSLRequireSSL AuthPAM_Enabled on AuthType Basic AuthBasicAuthoritative off AuthName "PAM" Require user AD\$user # Needed to squash spurious error messages AuthUserFile /dev/null # SVN stuff DAV svn SVNParentPath /var/www/svn/$user </Location> </Macro> # List of accounts Use SVNDir user1 Use SVNDir user2 # ... It works, but it isn't optimal. I'd like to somehow redo this so that it can just scan the list of directories in /var/www/svn and automatically do this for each of them. Is that possible? Thanks.

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• What are the common Linux commands for SAN-related activities? How do I check if a LUN is attached to the computer?

  - by Nishant

  How do I check if a LUN has been presented to my server? What are the Linux commands for that? Do the LUNs show up in a fdisk -l command like a normal /dev/sda gets listed? What are other commands associated with general SAN related checks in Linux? What is WWN and how does that have any relevance? If we have LUNs, what is the use of multipathing? Bit lengthy but I am not able to get a grasp on the topic. Any help would be appreciated.

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• File/folder Write/Delete wise, is my server secure?

  - by acidzombie24

  I wanted to know if someone got access to my server by using a nonroot account, how much damage can he do? After i su someuser I used this command to find all files and folders that are writeable. find / -writable >> list.txt Here is the result. Its most /dev/something and /proc/something and these /var/lock /var/run/mysqld/mysqld.sock /var/tmp /var/lib/php5 Is my system secure? /var/tmp makes sense but i am unsure why this user has write access to those folders. Should i change them? stat /var/lib/php5 gives me 1733 which is odd. Why write access? why no read? is this some kind of weird use of a temp file?

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• Cannot reformat flash drive

  - by user933531

  I have tried to reformat on Ubuntu using gparted, in Windows using their tool, and OSX using Disk Utility. I have also attempted by using the terminal but also failed there. When I verify disk using Disk Utility, I get the following output: Verifying volume “REDSTRIPE” ** /dev/disk2s1 ** Phase 1 - Preparing FAT ** Phase 2 - Checking Directories ** Phase 3 - Checking for Orphan Clusters 168 files, 4507316 KiB free (1126829 clusters) MARK FILE SYSTEM CLEAN? no ***** FILE SYSTEM IS LEFT MARKED AS DIRTY ***** Error: This disk needs to be repaired. Click Repair Disk. But I am unable to repair disk. See OSX examples below:

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• Install user scripts on Chrome

  - by Ahatius

  I created a JavaScript file, and named it test.user.js. I tried double clicking it, dragging & dropping it into Chrome and opening it with Chrome, but it won't install. I've already installed the dev version of Chrome, because it's stated somewhere that it's needed, but I can't get it to work. Then, I tried searching for a Chrome Greasemonkey addon, just to see that it was no further developed on, because Chrome has built-in support. Could someboy tell me what I have to do in order to get user scripts working on Chrome v21?

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• ext4 loopback device, Buffer I/O Error on reboot

  - by cvb

  I am trying to mount a loopback device on my ext4 formatted ssd drive. I get these errors when I reboot on Linux kernel 2.6.38.8 Buffer I/O error on device loop1, logical block 0 Here is what I do: dd if=/dev/zero of=/mnt/s/lodev bs=4096 count=250000 mkfs.ext4 /mnt/s/lodev mount -n -o loop,rw /mnt/s/lodev /mnt/test The loopback mount is successful, but on reboot I get errors as mentioned above. Even mouting with 'sync','data=writeback' does not help. I tried to losetup a device, but see the same behavior. I also reformatted the base device and created the loopback device and mounted as above, I still see these errors. I do not see them when I format them as vfat. Appreciate any suggestions on this problem.

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• Subdomain working externally only

  - by Digital Dan

  I am running a Windows Server 2008r2 web server with IIS. I have dev.domain.com and it works fine externally but when I try to access it from within the network it doesn't work. Is there a way to get this to work without changing the dns records for the whole network? I just have IIS Admin rights because our IT is done out of house. I can ask them to add it but I was hoping for another way. Thanks!

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• dhcp code for pxe server

  - by avoq

  I'm trying to understand every single line of the following script but to no avail. I'd be glad if someone could help me. For sure I know its purpose is to start the DHCP server as well as the TFTP...But I'm stuck: killall dnsmasq 2>/dev/null dnsmasq --enable-tftp --tftp-root=$PXEDATA/boot --dhcp-boot=pxelinux.0,"$IP",$IP --dhcp-range=$(echo $IP | cut -d. -f1-3).50,$(echo $IP | cut -d. -f1-3).250, infinite --dhcp-option=option:router,192.168.0.254 --log-dhcp Why killall, why dnsmasq 2 What does "2" stand for? "--" what does it mean? Thanks a lot.

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• BIND unstable with DLZ+MySQL on Ubuntu 9.10, any ideas?

  - by Chris

  My BIND server keeps dropping out and I can't work out why. Here is some info from the syslog that I think pertains to the failure(s): Apr 22 21:12:17 dnsdebug named[6613]: mysql driver unable to return result set for lookup query Apr 22 21:12:17 dnsdebug kernel: [285552.573949] type=1503 audit(1271963537.759:53): operation="open" pid=6618 parent=1 profile="/usr/sbin/named" requested_mask="::rw" denied_mask="::rw" fsuid=107 ouid=0 name="/dev/tty" Apr 22 21:12:17 dnsdebug named[6613]: mysql driver unable to return result set for lookup query Apr 22 21:13:17 dnsdebug named[6613]: last message repeated 7 times Any ideas? Mysql had a segfault sometimes, but that seems to be no longer an issue. It's the 64bit version of ubuntu too. Sometimes it will return records just fine, other times it appears to just randomly go down.

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• Map localhost to IP address on Windows XP & Internet Explorer 7+?

  - by roblocop

  I'm trying to map 'localhost' to an IP address elsewhere on the network, say '10.0.1.1' for example. I've tried editing my hosts file, changing the entry from: 127.0.0.1 localhost to 10.0.1.1 localhost with no luck. The closest I've gotten is using DNS spoofing via Charles. Adding a DNS spoof entry mapping the host name 'localhost' to '10.0.1.1' works fine in Firefox, but fails in Internet Explorer, basically showing IE's 404 page. I'm wondering if there's some specific setting or way I can get DNS spoofing to work in IE? The main issue I'm trying to resolve is that our development environment points to 'localhost' and rather than setting the dev env up in a legacy Windows laptop to try and debug, point to a server that has it all setup and I can make the changes remotely.

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• Putting a whole linux server under source control (git)

  - by Tobias Hertkorn

  I am thinking about putting my whole linux server under version control using git. The reason behind it being that that might be the easiest way to detect malicious modifications/rootkits. All I would naively think is necessary to check the integrity of the system: Mount the linux partition every week or so using a rescue system, check if the git repository is still untempered and then issue a git status to detect any changes made to the system. Apart from the obvious waste in disk space, are there any other negative side-effects? Is it a totally crazy idea? Is it even a secure way to check against rootkits since I most likely would have to at least exclude /dev and /proc ?

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• Recover data from SD card

  - by Paul Tarjan

  I have a 2GB kingston microSD card which is about 3 years old. I put it in a reader today in my Windows Vista computer, wrote a 32MB file onto it, safely removed it, and then tried to read it elsewhere. Nothing. Putting it back in vista it now says You need to format the disk in drive F: before you can use it. What should I do? I have access to many computers and OSes if your recommendations need that. I would be very sad if I lost all the contents of the card. Most of the data is backed up, but there are a few things that aren't. :( Doing a # dd if=/dev/sdg of=~/tmp/sd.bin gives me a 2 gig file, and grepping the file it seems like lots of my data is still there, how can I put it back together?

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