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• Linux HA - Best Heartbeat hardware solution

  - by Martino Dino

  Hi all I would ask anyone what is the best layer 2 medium for heartbeat in Linux and how it's best configured. More precisely I've been thinking about a dedicated NIC for that purpose but then i thought that if a switch breaks then i would loose the heartbeat connection for most of the cluster and STONITH 'BUM'!!! Will probably loose my job after :) Distributing the heartbeat onto the main NICs of every node trough a vif sounds reasonable but im not sure if this is the best option (at least the switches are redundant to some extent). Is it possible to use heartbeat over a bonded interface and that sounds reasonable? Do you have any other tip/solution for that issue?

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• Rewrite request URI based on Host header in HAProxy

  - by DorinC

  I would like to set up HAProxy to forward HTTP requests to some backend servers but I need it to also rewrite the URI part based on the Host. I've read through the doc but it seems that reqirep isn't suitable for this purpose. Any idea if this is even possible with HAProxy? Here are the details of what I'm trying to accomplish: Requests that come in on: http://www.original-domain.com/ would be balanced between: http://server1/domains/www.original-domain.com/ ... http://serverN/domains/www.original-domain.com/ The proxy should be able to handle this for any number of domains (original-domain.com can be anything, it's not limited to a fixed set of values). For this to work HAProxy would need to rewrite a request like this: GET /original-uri HTTP/1.1 Host: original-domain.com to: GET /domains/original-domain.com/original-uri HTTP/1.1 Host: serverN and forward that request to one of the internal servers.

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• Are there any statistics on the number of networks using Ethernet Jumbo frames?

  - by Russell Heilling

  I am often told by Sales Engineers and Product managers that a Layer 2 Ethernet service is not fit for purpose if the maximum supported frame size is in the 1518-1522 range (enough to support standard Ethernet frames or VLAN tagged frames). Or in other words: an MTU of 1500 is not enough (see this blog post for my definition of MTU and a short rant on how the term is often misused) I am never able to get any details from them on: a) What proportion of customers (Enterprise / SMB) require Jumbo frames b) What are typical expectations on frame size for Jumbos on WAN links? 1600, 2000, 9k, etc... I know that in Telco and Data Centre environments Jumbos are pretty common, but I am after some insight as to how common this is within Enterprise and SMB networks.

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• Tool to maintain/keep track of filesystem content integrity?

  - by Jesse

  I'm looking for a tool to maintain the integrity of a filesystem and it's contents using checksums. Effectively storing a list of checksums/filename pairs somewhere on the filesystem in a way that can be verified later if files are somehow damaged or lost. Git does what I want, but because it stores the contents of every file in it's object database, the disk usage will at least double. And the fact that it does not provide a progress bar when scanning files tells me it was not designed for the multi-terabyte filesystem I have in mind. I can do this crudely by storing the output of md5deep, but is there a tool specifically designed for this purpose, using whatever smarts possible to make the process efficient?

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• conditional formatting for subsequent rows or columns

  - by Trailokya Saikia

  I have data in a range of cells (say six columns and one hundred rows). The first four column contains data and the sixth column has a limiting value. For data in every row the limiting value is different. I have one hundred such rows. I am successfully using Conditional formatting (e.g. cells containing data less than limiting value in first five columns are made red) for 1st row. But how to copy this conditional formatting so that it is applicable for entire hundred rows with respective limiting values. I tried with format painter. But it retains the same source cell (here limiting value) for the purpose of conditional formatting in second and subsequent rows. So, now I am required to use conditional formatting for each row separately s

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• How to connect to WPA2 encrypted wireless-network when booted from CloneZilla Live-CD?

  - by caligula

  My intention is to perform a backup of my laptop's (Dell Vostro 3350) sda1 disk to my desktop. After some googling I decided to use CloneZilla for that purpose. I have an OpenSSH server installed and running on my desktop. So I inserted CloneZilla CD to CD-rom, booted from it, then chose an option smth like "use ssh server to store image". Then I got an invitation to choose a network interface. I chose wlan0 and entered shell to manualy configure connection. And that's where I got into trouble, for wifi-network which I wanted to use is WPA2-encrypted, and I don't know how to connect to it from command line. Can somebody assist me. Appreciation for advance.

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• I want to install an MSI twice

  - by don.vince

  I have a peculiar wish to install an msi twice on a machine. The purpose of the double install is to first install under the pre-production folder, run the deployment in a safe environment prior to deploying in the production folder. We typically use separate machines to represent these different environments however in this case I need to use the same box. The two scenarios I get are as follows: I've installed pre-production, I'm happy, I want to install production, I run the msi, it asks whether I want to repair or remove the installation I've production installed, I want to install the new version of the msi, it tells me I already have a version of the product installed and I must first un-install the current version The first scenario isn't too bad as we can at that point sensibly un-install and re-install under the production folder, but the second scenario is a pain as we don't want to un-install the live production deployment. Is there a setting I can give to msiexec that will allow this? Is there a more suitable different approach I could use?

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• hardware for pushing buttons

  - by Elazar Leibovich

  Many times I want my computer to interface old hardware. Such as radio, light switch, etc. This mostly involves pushing pressing and moving various buttons and switches. I don't want to buy new hardware I want my computer to interface the old hardware I already have. I thought about it and reached to the conclusion that what I need is a general purpose button-pusher hardware. I need a simple device I can interface by a computer and would be able to push most of the buttons we have in daily accessories, without damaging the button. Is there any such accessory availible?

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• Ubuntu not installed-Please Remove installation media and close tray and press enter

  - by Ram

  I have downloaded Ubuntu 12.04.1 LTS 32 bit, burned it on DVD and tried to install it on my PC. My PC is running in Windows 7 Ultimate 32 bit mounted on the C: drive. Now I want install Ubuntu along with my Windows 7. When I boot Ubuntu through the CD, It boots and the Ubuntu install windows opens It offers "Try Ubuntu" and "Install Ubuntu". I choose "Install Ubuntu" Then I go on to install Ubuntu with Windows(First Option)-install It shows some blank screen with some lines, and says "Please Remove installation media and close tray and press enter" Then the PC restarts and runs Windows 7 same as before normally. But Ubuntu is not installed. How to solve this problem and install Ubuntu on my PC properly? Note: I am an Android Developer. So I need to install Ubuntu for my Android Development purpose.

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• Snow Leopard directories after hard disk crash and restore from Migrate Utility

  - by ennuikiller

  My hard drive on my macbook pro crashed the other day and I got a replacement from Apple with a vanilla snow leopard install. Upon returning home I used the Migration Utility to restore my previous data and configuration. So far, so good! Everything looks and works exactly the same as before the crash. However, I noticed these 2 directories that are taking up quite a bit of space: /Developer (from old Mac) /opt (from old Mac) The question is can I safely remove these? As I said, my macbook pro appears to be restored completely to before the hard drive crash. I can run all my apps and all my files appear to be intact. Therefore it seems the system is not using these directories. Also because of their odd names it doesn't seem that os x is using them for any purpose. Thanks in advance for any help!

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• Saving music wisely: Why save 'Queen - Bohemian Rhapsody.mp3' millions of times?

  - by hsmit

  As far as I'm concerned, Queen's song 'bohemian rhapsody' is one of the most popular songs all time. But for the purpose of this message you may replace this with another track. At the same time I think 60% of the digital-music listeners have this track. Sometimes we have multiple copies: different versions of the track, different devices, unwanted duplicates in download folders, itunes folders etc.. Wouldn't it be much smarter to store these songs only once? You can imagine various solutions for this. How would you accomplish this? Some criteria that may help you find an answer: It must reduce disk space It must remember which music belongs to you (DRM) It must use network traffic efficiently

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• How should I isolate computers with different roles on a network

  - by fishhead

  I work in an industrial plant and we have one network(physical wire) that us used for both office usage and for process systems. The office computers are only used for typical office needs but occasionally do connect to the process computers to obtain information from a sql server or for some other purpose. A new initiative is in the works and is rolling down hill from corporate and that is to standardize how the the computers are used at work and they would be severely locked down and only a standard set of applications will be allowed to execute. one of the requirements is to also have non office computers isolated from the company domain. our non-office computers are a mix of Man-Machine interfaces and sql-servers all running software that non standard. My question is, how can we divorce the control systems computers from the company domain but still have access to the servers from the company domain. thanks

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• How should I isolate computers with different roles on a network

  - by fishhead

  I work in an industrial plant and we have one network(physical wire) that us used for both office usage and for process systems. The office computers are only used for typical office needs but occasionally do connect to the process computers to obtain information from a sql server or for some other purpose. A new initiative is in the works and is rolling down hill from corporate and that is to standardize how the the computers are used at work and they would be severely locked down and only a standard set of applications will be allowed to execute. one of the requirements is to also have non office computers isolated from the company domain. our non-office computers are a mix of Man-Machine interfaces and sql-servers all running software that non standard. My question is, how can we divorce the control systems computers from the company domain but still have access to the servers from the company domain. thanks

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• Two Google accounts in firefox for email/reader/openid

  - by deddebme

  I usually checking my personal gmail account account at work, and I have another gmail account for work/professional purpose. Now I am starting to see more sites using OpenID. The problem I am facing is that I want to check my gmail from firefox, but I want to use my work google account to login with OpenID website. Is there an easy to do so? Of course one way is to logout my personal account, login my work account, OpenID login to those sites. Second way is to use another browser for my personal gmail and firefox for work, but are there a better way because I hate using two browsers at the same time?

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• New standalone ESXi 5 deployments - USB versus SD card?

  - by ewwhite

  Now that the old full VMWare ESX with service console is no longer, I'm redeploying some standalone ESXi servers. I'm using HP ProLiant ML and DL G6 and G7 servers. Does it make more sense to utilize the internal USB port for ESXi or the internal SD card slot? I'm using the HP ESXi 5 build, but am not sure what the recommended practice is. Any recommendations on cards/USB drives for this purpose? BTW - these will be all-in-one storage servers with the onboard disk storage presented via PCIe passthrough.

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• PHP5 without PHP4 compatibility

  - by Serty Oan

  This is the opposite question of this one. My purpose is that there is no need when you write only PHP5 code to have PHP4 compatibility. It is not helpful at all and due to differences between object models in those two version, it must be penalizing on interpreter performances (or am I wrong ?). So my questions are : is it possible to recompile PHP5 without retrocompatibility with PHP4 or to disable it in any other way to gain performances ? if it is not possible, is there a project somewhere which aim that goal ?

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• Where can I learn various hacking techniques on the web?

  - by Carson Myers

  I would like to try my hand at hacking -- that is, exploiting various website vulnerabilities. Not for any illegal purpose mind you, but so I can have a better understanding and appreciation of these exploits while writing my own web software. I seem to recall that there was a community that hosted a bunch of demo websites, and you had to find and exploit certain vulnerabilities with each one. I can't remember what it is called but this is the sort of thing I am looking for -- I have read a tonne of little XSS and CSRF examples but have yet to find a real-life hands-on example of one. Does anyone know of such a place, where I can be given an example page and look for security holes? I would really rather not try this with actual websites, I don't want to break any laws.

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• How to subscribe to a youtube feed from linux command line?

  - by Tim

  I want to subscribe to a youtube channel and automatically download new videos to my linux machine. I know I could do this e.g. with miro, but I will not watch the videos using Miro, want to choose the quality and would like to run it as a cronjob. It should be able to: know which feed entries are new and not download old entries resume (or at least redownload) failed/incomplete downloads from older sessions Are there any complete solutions for this? If not it would be enough for me (maybe even preferable) to just have a command line rss reader that remembers which entries have already been there and writes the new video urls (e.g. http://www.youtube.com/watch?v=FodYFMaI4vQ&feature=youtube_gdata from http://gdata.youtube.com/feeds/api/users/tedxtalks/uploads) into a file. I could then accomplish the rest using a bash script and youtube-dl. What would be programs usable for this purpose?

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• How to limit disk performance?

  - by DrakeES

  I am load-testing a web application and studying the impact of some config tweaks (related to disk i/o) on the overall app performance, i.e. the amount of users that can be handled simultaneously. But the problem is that I hit 100% CPU before I can see any effect of the disk-related config settings. I am therefore wondering if there is a way I could deliberately limit the disk performance so that it becomes the bottleneck and the tweaks I am trying to play with actually start impacting performance. Should I just make the hard disk busy with something else? What would serve the best for this purpose? More details (probably irrelevant, but anyway): PHP/Magento/Apache, studying the impact of apc.stat. Setting it to 0 makes APC not checking PHP scripts for modification which should increase performance where disk is the bottleneck. Using JMeter for benchmarking.

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• Can't run node.js script on server reboot

  - by webstyle

  I need to listen events on port 3240 and I'm using node.js for that purpose. I need to execute my script with forever tool. I also need to run forever on server reboot. When I run forever glh.js everything works: forever list says there is a running process. But when I'm trying to run forever on server reboot I can't get it working. I've created a file in /etc/init.d with the following content: #!/bin/bash /var/www/yan/data/gitlabhook/runglh.sh &>/var/www/yan/data/gitlabhook/runglh.log When I reboot the server, the output log is the following (the same as when I run it manually via console): info: Forever processing file: glh.js But in this case forever doesn't start a process. forever list outputs: info: No forever processes running

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• Rendering Machine Configuration [closed]

  - by user1184598

  I would like to buy a computer for Rendering purpose. The Rendering is based on DirectX in Windows 7. It needed to support multi-thread rendering which is highly demanding (around 20 threads doing rendering and connection to MS SQL Server job simultaneously). Could I have some suggestion on the configuration of the computer? e.g. what kind of CPU, GPU, Mother Board should be used? The budget is around US$1000. Thank you very much.

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• Applocker custom extension (Java, CPL, MSC etc.)

  - by test1839

  We have a Terminal server and want to prevent users from running inappropriate software. Previously we used Software Restriction Policies for this purpose. Now, Microsoft seems to recommend Applocker instead. However we found no possibilities to add custom extensions like JAR, CPL, MSC etc. which was possible in Software Restriction Policies. Do you know how to add custom extensions to the Applocker policies in Windows 2008? Or how can we block custom script interpreters like Perl etc.?

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• How to select a server that supports Windows scheduled file IO

  - by Kristof Verbiest

  Background: I am developing an application that needs to read data from disk with a fairly consistent throughput. It is important that this throughput is not influenced by other actions that happen on the disk (e.g. by other processes). For this purpose, I was hoping to use the 'Scheduled File I/O' feature in Windows (throught the GetFileBandwithReservation and SetFileBandwithReservation functions). However, this StackOverflow question has thought me that this feature is only available if the device driver supports it. Currently I have no computer at my disposition that seems to support this feature (I have an HP Proliant server and a Dell Precision workstation). Question: If I were to order a new server, how can I know beforehand if this feature will be supported by the device driver? How 'upscale' does the server have to be? Has anybody used this feature with success and cares to share his experiences?

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• How to properly create a startup script for tracd on Synology DS209+II?

  - by Daren Thomas

  I'm running tracd on a Synology DS209+II NAS. For that purpose, I have created a script in /opt/etc/init.d called S81trac: myserver> ls -l /opt/etc/init.d -rwxr-xr-x 1 root root 127 May 19 09:56 S80apache -rwxr-xr-x 1 root root 122 Jun 10 10:17 S81trac This file has following contents: #!/bin/sh # run tracd /opt/bin/tracd -p 8888 -auth=*,/volume1/svn/svn-auth-file,mydomain -e /volume1/trac-env And this actually works, except, the NAS never really finishes booting: The blue light keeps flashing. Also, reboot doesn't work anymore (it hangs) and I have to use killall init to reboot the machine. I have tried running tracd in the background, by appending & to the last line of S81trac. After rebooting, the blue light stops flashing. But ps | grep tracd is empty and I can't connect to the trac instance from my PC. I guess I'm doing something wrong here, but what?

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• Is my disk hot or not?

  - by adriangrigore

  I am trying to figure out the temperature of my dedicated server's harddisk. For this purpose, I've downloaded HDTune to monitor the S.M.A.R.T. Status. The problem is that the current temperature for "C2 Temperature" is 73 degrees celsius, but the little thermometer on top of the window shows 27 degrees celsius. See this screenshot: http://screencast.com/t/OGJhZGIxND Another monitoring software (Anfibia Reactor) shows similar behavior: Disk temperature is around 30 degrees, but it says that the disk is too hot. So, is my disk hot or not? Since this is a dedicated server, I can't just open the case and put a thumb on it.

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