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Building fault-tolerant and scalable web application is a MUST for every serious business and platform. Here you can find nice overview of techniques to achieve that in AWS. But since AWS is a platform which allows you to build whatever-you-want on the top of it, some extra work is needed to achieve completely redundant and [...] So… everyone are speaking about having single storage unit in AWS. That’s a real demand these days, and here is one way of doing that. The answer is – NFS! So basically, you do the following: - launch/create VPC http://docs.aws.amazon.com/AmazonVPC/latest/GettingStartedGuide/ExercisePreqs.html - create VPC private subnet http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/VPC_Scenario2.html - Launch instance in public subnet, and create NFS [...] Few steps you need to perform, for example creating Raid1 and preserving it’s creation after server reboot: # yum install mdadm Now, first check your devices, for this example we will presume their names are /dev/xvdf and /dev/xvdg (modify this to suit your needs): # mdadm –create –verbose /dev/md0 –level=1 –raid-devices=2 /dev/xvdf /dev/xvdg Next, we [...] I have installed Ubuntu 11 to my Sony Vaio laptop, but mouse touchpad was working very bad (i.e. was not working). Solution: First, check your Sony version, just to be sure: # dmidecode -s system-product-name After that, tell Ubuntu to use your touchpad as mouse PS2: # echo options psmouse proto=imps | tee -a /etc/modprobe.d/psmouse.conf; [...] Recently I wanted to install some Perl modules for mail server vacation.pl script, but it was failing do to so: # perl -MCPAN -e shell # cpan> install DBD::mysql … Uncompressed /root/.cpan/sources/authors/id/C/CA/CAPTTOFU/DBD-mysql-4.022.tar.gz successfully Using Tar:/bin/tar xvf /root/.cpan/sources/authors/id/C/CA/CAPTTOFU/DBD-mysql-4.022.tar: Couldn’t untar /root/.cpan/sources/authors/id/C/CA/CAPTTOFU/DBD-mysql-4.022.tar Hmm, but /bin/tar exists: [...] Recently I just wanted to copy some files from one server to another, regularly using scp. However, even if I opened all ports, transfer failed with SCP, but without any error message, just the output from my .bashrc which I used as identification for every server (I just put simple “echo server1″ into .bashrc as [...] Instead of using “tcpdump”, why not trying “tcpflow”? From the man page: tcpflow is a program that captures data transmitted as part of TCP connections (flows), and stores the data in a way that is convenient for protocol analysis or debugging. A program like tcpdump(4) shows a summary of packets seen on the wire, but [...] Bash script for changing extension type on many files inside the directory (for example, if you have many pictures ending in .jpeg and you want to change them to .gif): #!/bin/bash echo "source extension?" read source echo "destination extension?" read target for i in `ls *$source`; do file=`ls $i | sed "s/$source/$target/"` echo "changing source [...] If you need Amazon VPC but you don’t have any piece of hardware equipment that will satisfy requirements (as described here), don’t panic! There is a solution – you can use Linux to route your traffic to Amazon VPC! This scenario has been successfully tested and is working on following configuration: Debian 6 with one [...] Very useful thing if you want to extend your usage of VIM (which is, by my opinion, best editor in the world ) Basically it is acting as plugin to vim, after you run vim just type “:NERDTree” and see the magic – it will open tree with all files and directories from location where [...] |
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