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Displaying posts with tag: Linux Apache MySQL PHP (reset)

[CentOS] OpenVZ – container based virtualization quick guide. Part 2
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In this guide, we will be exploring how to use the tools which come with OpenVZ and setup a internet facing container/vm. This part of the guide also assumes you have followed part 1 to setup the container already and have a working environment.

In part 1, we setup a CentOS container which we could enter/exit but we didn’t do anything else on the network. What we want to do is set it up so we have the ability to bridge our hosts’ network and define static IP for network interface.

yum install bridge-utils

[root@tooncent ~]# cat /etc/sysconfig/network-scripts/ifcfg-eth0
# Broadcom Corporation NetXtreme BCM5761

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[CentOS] OpenVZ – container based virtualization quick guide. Part 1 of 2
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This quick guide will walk you through setting up OpenVZ on CentOS. I followed these steps on CentOS release 5.5 x64 version. If you want more detail on install via different methods and/or have different flavor of CentOS and run into an issue, you can follow instructions provided by OpenVZ site. Once you are done with this guide, you will have CentOS container running for you to play with.

For my purposes, I started with very basic installation of CentOS 5.5. I have done this on existing installations of CentOS without any issues as well. Ok so let’s start with getting the OpenVZ repository added to our system. This means that we will be going down “yum” path instead of “rpm” path. This is the quickest and easiest way to get OpenVZ installed.


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[Bash] Performing array intersection with Bash
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I am currently working on a project to deploy new website builds to a
small number of servers. I needed something simple and reliable that could
be built in a very short period of time. I decided to whip something up in
bash with the intent of refining it in Python later.

As I began to write this code, I realized that it probably would have been
quicker to do it in Python from the start. I decided to stick with bash as
somewhat of an academic exercise. The vast majority of these deployment
scripts were trivial; check the code out of git, create a manifest, package
it up, spew it to the servers, etc, etc. The problem came during the last
step. We decided to use a symlink to point to the active build out of a
number of builds that could be available on the server at any given time.
Since all of our servers should be

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How do you print number of files for each folder in a directory [Linux]
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I have been annoyed by the fact that I couldn’t easily print file count for all of the folders in certain directory.  Most of the time I just want to see what space each folder is using (du -hs *) but there are times when I need to know how many files are in each folder (checking cache folder, session folders etc).   So I whipped together a command line which does just that for me:

for i in `find -maxdepth 1 -type d`; do  echo -n $i " ";find $i|wc -l; done

I am sure there are many different ways to show file count for each folder in a directory and I am curious to see what people do so please do post comments with what you do.

Above command is pretty simple and can be expanded to do whatever you need.  For example, you can throw it into a bash script and be able to pass parameters.  For example:  count_files /home/  In this case

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PHP: Curl being slow from php call on CentOS 5.4
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I ran into an issue where curl request run within few ms from command line but same url fetch was taking over 10 secs. After doing some debugging and research it turned out that call to check (getaddr ipv6 was timing out. Obviously you can do multiple things to fix this (including enabling ipv6 support) but since I did not have a need for ipv6 (it is disabled in my network configuration), I decided to recompile curl and disable ipv6. Here is the command for recompiling curl and installing into /usr/local/curl directory with ipv6 disabled.

./configure –prefix=/usr/local/curl –disable-ipv6

DISCLAIMER: Please be smart and use code found on internet carefully. Make backups often. And yeah.. last but not least.. I am not responsible for any damage caused by this

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Virus: What is virus on facebook?
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If you are a facebook user, please be aware that virus is spreading quickly on facebook. From what I have seen online so far, it seems to redirect to a site which probably is stealing data from you computer and/or installing trojans. Initially it looks like this site allows to create generation tree and looks like a legit domain. This is being spread via messages to you from other friends of yours who are “infected”.

One of the things you can do to prevent getting “infected” is to not click on any links on facebook. Even if it comes from friends you trust.  It would also be a good idea to arm your self with the best virus protection software.  If you do click on a link, make sure you don’t enter any login/passwords  on any sites you end up on.

Here is an article on eHow

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Health: H1N1 Swine Flu Google Map
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There has been a lot of talk on the news about the swine flu and how it is spreading fast and a lot of people are affected. Here is something worth checking out, a google map with incidents marked with information on areas affected, how many dead, infection reported, etc.

Watch where you hang out and if you are feeling any symptoms, go see a doctor.

Here is some info from  wikipedia:

Mexican officials state that since March 2009 there have been over 1600 reported cases and put the death toll at 149, with 20 confirmed to be linked to a new swine

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Telnet: shell script to issue commands to telnet session.
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This is a quick post to show how one can issue commands to telnet session from a shell script or command line with out going into interactive mode. I use this to get stats from our memcache servers or issue a flush_all via telnet from a script/cron.

So without further delay, following command will telnet to local memcached server on port 11211 and issue one of the memcached commands, stats

(sleep .5;echo stats) | telnet localhost 11211
You may have to play with the sleep timer to get it to work for your environment but in our .5 was the sweet spot. Good luck and let me know if you have another shell command. Obviously we can do this from perl, php, python, etc but the beauty of this is that you do not need

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RewriteRule: How to avoid passing query string when you redirect.
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Today I ran into an issue which I could not figure out for quite a while. I was trying to redirect a url to another url using RewriteRule. It was supposed to be a pretty straightforward redirect which made it even more annoying than complicated ones. Hopefully somebody is able to explain what I am missing here and if my solution is a good solution or not.

I needed to redirect a url: to

So I added this to .htaccess file:

RewriteRule ^testpage\.php / [R=301,L]

This did do a 301 redirect as I wanted but query string passed so my redirected url looked like:

Obviously this is not what I wanted so in order for me to fix it, I had to take a rather lame approach.  My new redirect is:

RewriteRule ^testpage\.php

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SVN: How do you use svn command line on Windows with ssh tunneling?
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If you ever used svn command line, you know it is not optimal to type in your password every time you do checkout, checkin, info, etc.  In linux world, it is very easy to setup keys to get around this.  Of course in the world of Windows it is not as easy.  Here are the steps you need to follow to get private/public keys working with your SVN under Windows using ssh tunneling.

Assumptions:  you will be connecting as user “root” to svn server located at “″.  All your files will be saved at c:\ including your svn command line utility

First we will have to generate a key.  We can accomplish this by using a free utility called

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Showing entries 1 to 10 of 33 10 Older Entries

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