Command Center

PHP Hide your Files location

2012-02-02T15:23:00.000-08:00

This Code , will Help you Hide your files location, Images, MP3, Video .. and Create a Mask Link to the files . Example : Your link is : http://www.somesitehere.com/image.jpg with this code the link will look like : http://www.somesitehere.com/getfile.php?file=image.jpg u can even make catgoreys , and the link will look like Download Make sure to edit the code Below to Put down the Name of

Redundant Servers and Load Balancing using MX Records

2012-02-01T12:22:00.001-08:00

The normal mail delivery process looks up DNS Mail Exchange (MX) records to determine the destination host. A MX record tells the sending system where to deliver mail for a certain domain. It is also possible to have several MX records for a single domain, they can have different priorities. For example, our MX record looks like that: Code:> dig -t mx proxmox.com ;; ANSWER SECTION: proxmox.com.

How can I mount an FTP to a drive letter in windows?

2012-01-31T11:02:00.000-08:00

Webdrive FTPDrive REFERENCES http://serverfault.com/questions/6079/how-can-i-mount-an-ftp-to-a-drive-letter-in-windows

Linux Package Manager Command Line Comparison

2012-01-26T10:31:00.000-08:00

This page pulls heavily from openSUSE's Software Management Command Line Comparison. It has been simplified and has added Arch to the comparison, as well as modified the order in which each distribution exists for the benefit of Arch users.Users from other Linux distributions can benefit from pacman by using a simple wrapper: pacapt. The script could also be intended for Arch users having to

Set Up Rsyslog and LogAnalyzer on CentOS Linux 5.5 for Centralized Logging

2012-01-25T11:04:00.000-08:00

LogAnalyzer is a web based program that allows you to view event messages from a syslog source within your web browser. Rsyslog is a drop in replacement for the syslog daemon that among other things allows syslog messages to be saved in a MySQL database. Combining these two great programs and directing other network devices to forward syslog messages to a central server allows for a very

Linux - Find string in files.

2012-01-24T13:05:00.000-08:00

find . | xargs grep 'string' -sl The -s is for summary and won't display warning messages such as grep: ./directory-name: Is a directoryThe -l is for list, so we get just the filename and not all instances of the match displayed in the results.Performing the search on the current directory I get: ./javascript_open_new_window_form.php ./excel_large_number_error.php ./

Htaccess Rewrites – Rewrite Tricks and Tips

2012-01-24T12:15:00.000-08:00

ContentsHtaccess rewrites TOC .htaccess rewrite examples should begin with: Require the www Loop Stopping Code Cache-Friendly File Names SEO friendly link for non-flash browsers Removing the Query_String Sending requests to a php script Setting the language variable based on Client Deny Access To Everyone Except PHP fopen Deny access to anything in a subfolder except php fopen Require no www

3 Ways to Serve PDF Files using Htaccess Cookies, Headers, Rewrites

2012-01-23T14:20:00.000-08:00

3 Ways to Serve PDF Files using Htaccess Cookies, Headers, Rewrites ContentsWhat's Going On How It WorksUnique HTTP Headers ReturnedSave As Mode (askapache_pdf=s) Inline Mode (askapache_pdf=i) Download Mode (askapache_pdf=a) Htaccess Demo File Javascript used by Demo Alternative Method - No Cookies + PHPpdf-dl.php Alternate Method .htaccess More InfoInteresting Reading Intense Reading FYI,

.htaccess Examples: Cookies, Variables, Custom Headers

2012-01-23T14:19:00.000-08:00

.htaccess Examples: Cookies, Variables, Custom Headers ContentsMod_Rewrite .htaccess ExamplesRedirect Request ending in .html/ to .html Or a lower quality alternative Redirect All Feeds to Feedburner's MyBrand Cookie Manipulation and Tests with mod_rewriteSet a Cookie based on Requested directory Get Cookie Value Rewrite Based on Cookie Value Redirect If Cookie Not Set Setting Environment

11 useful commands for Linux/Unix administrators

2012-01-23T10:53:00.000-08:00

Command line is more powerful because you can do lot with them, you can tell your computer exactly what you want and get the appropriate answer, while GUI application can only tell your computer what the GUI programmer has defined. Recently, CLI is mostly used by Linux/Unix administrators since most popular linux distros come with a complete set of GUI applications that make the user use less

RHEV 3 vs Vsphere 5 0

2012-01-19T11:02:00.000-08:00

Some days ago Red Hat has announced the availability of its Red Hat Enterprise Virtualization (RHEV) 3.0 public beta. The first beta of RHEV 3.0 was announced in August, but was not available to the general public. You needed to have an active RHEV subscription at that time. The evaluation is immediately available to anyone with a Red Hat Network account.About the new features and the

92 Open Source Apps That Replace Everyday Software

2012-01-19T10:56:00.000-08:00

http://www.datamation.com/open-source/92-open-source-apps-that-replace-everyday-software-1.html

MULTIPLE DROPBOX INSTANCES ON WINDOWS 7

2012-01-18T16:03:00.000-08:00

At Semi-Legitimate Software, we use and highly recommend DropBox for file sync, backup, and collaboration.We recently had a need to run two DropBox instances concurrently on a few of our Windows 7/Vista workstations (if you are running Mac or Linux there are alternate methods to do this documented here. If you are running an older version of Windows, this may work for you. We've not tested either

Dropbox and vimwiki

2012-01-18T15:24:00.000-08:00

“vimwiki let g:vimwiki_use_mouse = 1 let g:vimwiki_list = [{'path': '~/Dropbox/vimwiki', \ 'path_html': '~/Dropbox/vimwiki/html', \ 'html_header': '~/Dropbox/vimwiki/template/header.tpl',}] REFERENCES http://gaowhen.com/post/anytime-anywhere-vimwiki.html http://www.cach.me/blog/2011/01/weierophinney-is-a-genius-vim-task-lists-wikis-and-more/ http://superuser.com/questions/239960/

10 Open Source Shopping Carts to Run Your Ecommerce Business

2012-01-18T14:11:00.000-08:00

More and more companies have turned to the Web to transact business. And, of course, if you are going to sell on the Web, the right shopping cart can mean the difference between red and black ink. When shopping for your own ecommerce shopping cart software the most important aspect to consider is how well the cart software meets your business objectives. An ecommerce shopping cart has to be

Rebooting When Filesystem Fails

2012-01-16T13:45:00.000-08:00

Recently I found myself stuck with a system that allowed me to ssh into it but the root filesystem was read-only and all the binaries in /sbin, /bin, or /usr/bin were simply not accessible.I attempted to run shutdown -r now and reboot without any success. I was really stuck as I did not have physical or KVM access to the server which was located in our office and no one were going to be there

upstream timed out while reading response header from upstream

2012-01-12T12:12:00.000-08:00

Testing mcrypt library in PHP, this error occurs: #sudo tail -100 /var/log/php5-fpm.log Jan 04 12:17:14.425241 [WARNING] [pool www] child 28983 exited with code 2 after 1.756421 seconds from start Jan 04 12:17:14.431710 [NOTICE] [pool www] child 28997 started #tail /var/log/nginx/error.php2012/01/12 11:33:25 [error] 29037#0: *6042 upstream timed out (110: Connection timed out) while reading

Unicode-friendly PHP and MySQL

2012-01-10T16:37:00.000-08:00

Nowadays, full Unicode support is a must-have for good web applications; shuffling text around as single-byte Latin characters isn’t enough, even if you’re only targeting English speakers.PHP’s UTF-8 support still isn’t tightly integrated, but it’s good enough if you’re careful. However, I’ve encountered a lot of conflicting information and examples that didn’t work for me, so here’s a summary of

The Absolute Minimum Every Software Developer Absolutely, Positively Must Know About Unicode and Character Sets

2012-01-10T16:36:00.000-08:00

Ever wonder about that mysterious Content-Type tag? You know, the one you're supposed to put in HTML and you never quite know what it should be?Did you ever get an email from your friends in Bulgaria with the subject line "???? ?????? ??? ????"?I've been dismayed to discover just how many software developers aren't really completely up to speed on the mysterious world of character sets, encodings

Fixing ip_conntrack Bottlenecks: The Tale Of The DNS Server With Many Tiny Connections

2012-01-09T14:56:00.001-08:00

Server management is a funny thing. No matter how long you have been doing it, new interesting and unique challenges continue to pop up keeping you on your toes. This is a story about one of those challenges. I manage a server which has a sole purpose: serving DNS requests. We use PowerDNS, which has been great. It is a DNS server whose backend is SQL, making administration of large numbers

redeliver or resend all mails in queue

2012-01-09T14:42:00.000-08:00

How to force Sendmail to redeliver or resend all mails in queue ?Here is the command **You must be root to execute this command. sendmail -q -vPostfix queue tools Here are a few handy items for Postfix email server users: 1. If your system is acting as a spam / antivirus / relay server for secondary internal servers, and your destination mail server is down, postfix will queue your messages

load average

2012-01-09T10:36:00.001-08:00

If your load average is less than the number of cores in there, don't worry about it. easy way to think is.. a load of 1 for 1 cpu system is 100% if your OS sees 8 cpus.. a load of .78 is nothing.. a load of 8 is something to check into REFERENCEShttp://serverfault.com/questions/346893/load-average-cpu-linux-server

opensource Asset Managment software : Uranos

2012-01-09T10:18:00.001-08:00

In the 3 former articles of this series we have saw OCSInventory, Fusion Inventory and GLPI 3 software that can create an asset inventory with your computers hardware and software.Today we’ll take a look at another software: Uranos (Unattended Resolution in A Nutshell – OS).Unattended Resolution in A Nutshell – OS is an open source software that will let you perform Asset Managment, Monitoring,

git - the simple guide

2012-01-09T10:02:00.001-08:00

setup Download git for OSX Download git for Windows create a new repository create a new directory, open it and perform a git init to create a new git repository. checkout a repository create a working copy of a local repository by running the command git clone /path/to/repository when using a remote server, your command will be git clone username@host:/path/to/repository trees your local

how to extract a rar or zip file on mac os-x

2012-01-05T16:33:00.000-08:00

Find a file ending in .zip or .rar that you can’t seem to open? If you need to get into and expand RAR files in Mac OS X, check out the free app UnRarX. Not only will UnRarX quickly open and extract .rar files, but it also has the ability to restore corrupted and missing archives using par files.How to Open .rar Files in Mac OS XOnce you have downloaded UnRarX, opening and expanding rar files is

fixed Header & Footer Layout: A Beginner’s Guide

2012-01-05T16:26:00.000-08:00

http://www.noobcube.com/tutorials/html-css/fixed-header-footer-layout-a-beginners-guide-/ http://www.webspeaks.in/2011/02/twiiter-style-fixed-header-using-css.html http://limpid.nl/lab/css/fixed/header-and-footer http://www.imaputz.com/cssStuff/bigFourVersion.html http://css.maxdesign.com.au/floatutorial/

Wi-Fi tech conferences?

2012-01-05T12:54:00.000-08:00

Even with good enterprise grade Access Points like Cisco Aironet 1200's and with a managed environment (with WDS\WLSE etc infrastructure) you will struggle to sustain >10 active users per AP on 2.4Ghz. If you can use 5Ghz 802.11n\a then you may be able to hit 30 concurrent users and still get acceptable web browsing traffic. To set this sort of thing up properly you would need about 10 AP's with

Five Steps to Creating a Wireless Network

2012-01-05T12:50:00.000-08:00

Wi-Fi Alliance Five Steps to Creating a Wireless Network Can I set up a Wi-Fi network? Setting up a wireless network is easier than you might think. Whether you are setting up a Wi-Fi network for you home, or for the office, you don’t have to be a tech guru to handle the job. That is why the Wi-Fi Alliance has created this easy-to-follow, step-by-step plan to creating your

How Many Users Can a Wireless Access Point Handle?

2012-01-05T12:33:00.001-08:00

How many users can a wireless access point handle? This is a loaded question and not one that many wireless vendors will answer for several reasons. However, I can give some guidelines and suggestions on what we experience in the field and I can explain some of the differences. If you refer back to my blog“How Much Capacity Does a Wireless N Access Point Have?” or Josh’s blog “Tips To Buy A

Preferred Master Browser

2012-01-04T10:37:00.000-08:00

Yes, Domain Controllers should be Master Browsers - setting your domain controllers as "Preferred Master" should fix most of the Master Browser election problem.One of the common reasons for operating a WINS server is to provide a central reference for NetBIOS names across several subnets. Choosing one primary WINS server and pointing all clients to it lets NetBIOS name resolution work across

CronTrigger Tutorial

2011-12-30T16:17:00.000-08:00

Original question was tagged cron so this first section applies to that. See below for an updated answer for the Quartz CronTrigger tool.Most crontabs don't let you specify the year so you'll probably have to put that in the script itself (or a wrapper around the script/program).You can do this with something like:if [[ $(date +%Y) != 2010 ]] ; then exit fi The option you're looking for to

Linux Redirection Cheat Sheet

2011-12-29T12:36:00.000-08:00

Normal Redirect: command > filename Redirect command output to a file command >> filename APPEND into a file command < filename Type a text file and pass the text to command commandA | commandB Pipe the output from commandA into commandB commandA & commandB Run commandA and then run commandB commandA && commandB Run commandA, if it succeeds then run commandB

IPTables packet traverse map

2011-12-29T12:16:00.001-08:00

1. 2.2. REFERENCES http://www.adminsehow.com/2011/09/iptables-packet-traverse-map/

A simple way to limit file downloads to only logged in users in WordPress

2011-12-28T16:47:00.000-08:00

So, you’ve used WordPress to build your client’s site and to provide downloads for the site’s users. You’re hiding the links to download content based on the user’s logged in status. Great. But what happens when the logged in user copies the download URL and sends it to his friend? Well, unless you’re filtering the download links and checking them with WordPress first his friend gets to

If not found, redirect to a different URL to check

2011-12-28T16:35:00.000-08:00

# Rewrite URLs of the form 'x' to the form 'index.php?q=x'. ##.htaccess RewriteCond %{REQUEST_FILENAME} !-f #RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ([^/\.]+)$ http://www.rose1.com/check_url.php?string=$1 [L] #check_url.php session_start(); require_once ("functions.php"); $db = new db_mysql(); $file_db = $db->getValue ("SELECT pl_name FROM promo_link"); $file_db2 = $db->getValue ("SELECT

Drupal 7: HipHop for PHP vs APC – benchmark

2011-12-22T11:03:00.000-08:00

Drupal is one of two most popular content management systems (CMS) written in PHP . It is used as a back-end system for at least 1.5% of all websites worldwide. It is also one with the the slowest systems of this kind on the InternetThere have been many suggestions on improving Drupal performance, some of them recommend the use of APC module, data caching, or even compilation of the entire system

Linux: 20 Iptables Examples For New SysAdmins

2011-12-22T11:00:00.000-08:00

Linux comes with a host based firewall called Netfilter. According to the official project site:netfilter is a set of hooks inside the Linux kernel that allows kernel modules to register callback functions with the network stack. A registered callback function is then called back for every packet that traverses the respective hook within the network stack.This Linux based firewall is controlled

Troubleshooting faulty network connectivity

2011-12-21T10:52:00.000-08:00

part 1: A step-by-step guide“My computer won’t connect to the Internet”.“I can’t get online”.“I’m getting ‘page cannot be displayed’ errors”.If you have worked as a network administrator or help desk specialist, you have probably heard these complaints and variants of them more times than you can count. Between improper IP addressing, malfunctioning hardware or faulty cables, incorrect DNS

What to Look for in PHP 5.4.0

2011-12-21T10:46:00.000-08:00

PHP 5.4.0 will arrive soon. The PHP team is working to bring to some very nice presents to PHP developers. In the previous release of 5.3.0 they had added a few language changes. This version is no different. Some of the other changes include the ability to use DTrace for watching PHP apps in BSD variants (there is a loadable kernel module for Linux folks). This release features many speed and

Setting up NGINX SSL reverse proxy for Tomcat

2011-12-20T10:41:00.000-08:00

Setting up Tomcat in some cases can be pain in the ass, especially when your application is pretty complex, in terms of large number of upstream servers which you all want to proxy via SSL.In my case, I was playing around with Shindig — an OpenSocial container, which itself is a Java servlet delivered via Apache Tomcat server. The goal was to reverse proxy Shindig through SSL, i.e. it should be

Installing OpenVZ on Amazon EC2

2011-12-20T10:37:00.001-08:00

Imagine, that your system is pretty complicated and consists of a number of components, each deployed into separate machine. For development & testing needs it’s always too costly to keep up & running all these machines. It’s not that as easy to make modification into your system structure, i.e. adding new machines with different roles, etc.One solution is a to virtualize all your stuff &

php echo a href

2011-12-19T15:18:00.000-08:00

As Russell alluded to, there is no need ot open

Tmux swap panes

2011-12-16T15:35:00.000-08:00

SESSION MANAGEMENTSessions are useful for completely separating work environments. I have a ‘Work’ session and a ‘Play’ session; in ‘Work’, I keep everything open that I need during my day-to-day development, while in ‘Play’, I keep open current open-source gems or other work I hack on at home.tmux new -s session_name creates a new tmux session named session_name tmux attach -t session_name

Nagios Icinga related

2011-12-16T10:42:00.000-08:00

icinga on Ubuntu bash install script http://blog.kyodium.net/search/label/icinga Related Articles http://www.kernelhardware.org/category/nagios/ http://www.thegeekstuff.com/tag/nagios/

Nagios Email Notification Frequency or Interval

2011-12-16T10:38:00.001-08:00

Question:How do I configure how often Nagios emails notifications about problems.Solution:The notification interval setting for service and hosts allows you to configure when email notifications get sent by NagiosNagios NotificationsBefore Nagios sends out a notification the program runs a series of filters.1. Are notifications enabled ?2. Scheduled Downtime for Host/Service ?3. Is service

How should I run fsck on a Linux file system

2011-12-15T12:29:00.000-08:00

Force fsck on boot using /forcefsckBy creating /forcefsck file you will force the Linux system (or rc scripts) to perform a full file system check.Login as the root: $ su - Change directory to root (/) directory: # cd / Create a file called forcefsck: # touch /forcefsckNow reboot the system: # reboot Scenario / Question:I need to check file system for errors using fsck. Can I run fsck on a

Smartd Error: Currently unreadable (pending) sectors

2011-12-15T12:21:00.000-08:00

I am encountering following error in /var/log/messages: Aug 15 03:55:42 hostname smartd[2366]: Device: /dev/sda, 1 Currently unreadable (pending) sectorsWhich cause the / partition to be mounted as read-only. The server is accessible anyway but you cant do anything much inside. Lets troubleshoot this.Collecting Information/TroubleshootingI see read-only filesystem mounted when creating a test

Nmap Network Probing Cheatsheet

2011-12-15T11:09:00.000-08:00

Nmap is a powerful utility for scanning your network and discovering all kinds of information about who is on it and what they’re doing. You can discover used and unused IP addresses, hostnames, services, and operating systems, and their versions – information that can help you monitor who is on your network, and lead you to unsafe or unauthorized servers.Nmap is included in all Linux distros,

Cygwin SSHd Autoblock Failed Logins

2011-12-15T11:05:00.000-08:00

I wrote a program to block IP addresses like you're asking for a couple of years ago, but did it for a Customer as a work-for-hire. Since I ended up with some "spare" time this evening I opted to re-implement the whole thing from the ground up, write some useful documentation, and generally make it a presentable program. Since I've heard from multiple people that this would be a handy thing to

Live USB Install Puts Linux On Your Thumb Drive With Ease

2011-12-13T12:24:00.000-08:00

Boot one of over a hundred Linux distros from a USB disk. With Live USB, software you can run on both Windows and Linux computers, it only takes a couple of clicks to make your USB disk a bootable Linux disk. The live CD just might be the most useful tool in any geek’s arsenal – we’ve pointed out 50 uses for live CDs in the past and plan on showing you many more.As time goes on, however, CD

Detecting and changing the encoding of text files.

2011-12-12T12:25:00.000-08:00

When you receive and need to handle multiple text files that use characters that are not natural to the English language, you may run into the problem that is dealing with different character encodings. This is particularly noticeable in websites, where if the browser try to interpret the text file with an encoding that differs from the actual encoding that the file is using, we can see strange

Nginx PHP-FastCGI https 502 error/white pages

2011-12-09T15:46:00.000-08:00

Server { listen 1.1.1.1:443 ssl; server_name website www.website; access_log logs/website.access.log main; error_log logs/website.error.log error; keepalive_timeout 70; root /srv/http/website/public_html; index index.php index.html index.htm; location /gallery/ { auth_basic "Restricted"; auth_basic_user_file /srv/http/

Bulk Senders Guidelines

2011-12-08T16:03:00.001-08:00

https://support.google.com/mail/bin/answer.py?hl=en&answer=81126

Yahoo is Filtering/Blocking my emails UPDATED

2011-12-08T15:53:00.001-08:00

Yahoo is filtering/blocking my email Yahoo tracks all connections made from outside mail servers and sometimes they will put a cap on how much mail you can send their clients if they think you are spamming, or just sending a lot of email to them in general. One way around this is to let Yahoo know your intentions by filling out the following Yahoo! Mail Bulk Sender Form located at: http://

Bulk Email Marketing - Information you should know before starting

2011-12-08T15:52:00.000-08:00

Before we get started, I would like to say once and for all, here at Anchor; we hate spammers. In saying this however, we do recognise that many of our customers have a legitimate requirement to send out large volumes of email to distribution lists in a largely automated fashion; some legitimate reasons may include sending periodic newsletters to an existing customer base or providing an update

How to get into Yahoo Inbox with your bulk emails

2011-12-08T15:06:00.001-08:00

Yahoo runs one of the strictest Anti Spam setups of all the Free mailServers. If you send any kind of bulk emails then you likely haven't had much success getting into the inbox of yahoo. Your Emails are either bounced with a deferred message, or they end up in the spam folder. After switching IPs of mymail server I had the opportunity to validate many of my theories on how Yahoo's AntiSpam

Setting up your Smart Phone for outgoing SMTP using Gmail

2011-12-08T10:34:00.000-08:00

NEMR does not allow relay of mail. Incoming mail server settings username = your nemr user name herepassword = your nemr password herePOP3 server = mail.nemr.netport = 110Security type = none Outgoing mail server settings You will have to use gmail for this.Sending Email using Gmail Outgoing Mail Server Settings (SMTP Settings)o For the outgoing mail server information enter smtp.gmail.como Check

Bash script to back up Linux, MySQL, Apache2, VMware Workstation, Oracle VirtualBox, Palm WebOS, and more

2011-12-07T11:59:00.000-08:00

#!/bin/bash #shopt -s -o noclobber #shopt -s -o nounset #Description: Bash script to back up Linux, MySQL, Apache2, VMware Workstation, Oracle VirtualBox, Palm WebOS, and more. #Written By: Jeff White (jwhite530@gmail.com) #Version Number: 1.8 #Revision Date: 8-20-2011 #License: This script is released under version three (3) of the GNU General Public License (GPL) of the FSF, the text of which

Backup all databases nightly w/ mysqldump

2011-12-07T11:49:00.000-08:00

So, I want to take a shell script and be able to put it on any machine - and have it backup the databases on that machine using mysqldump.. and put them each separately into a backup directory.. here's what I came up with. Can you make it better? #!/bin/bash DB_BACKUP="/backups/mysql_backup/`date +%Y-%m-%d`" DB_USER="root" DB_PASSWD="secretttt" HN=`hostname | awk -F. '{print $1}'` # Create

Error opening or locking INBOX user

2011-12-06T12:21:00.001-08:00

iPhone and POP3 Accounts As providers of email facilities to business, Toucan Internet LLP is called upon to offer additional support for the many mobile devices that hang on the end of our services. Most of these have their own little foibles that, if you’re unaware of, can cost hours of lost time, raise your blood pressure to dangerous levels and leave you wondering why you ever upgraded

phpMyAdmin config parameters explained

2011-12-05T15:59:00.000-08:00

http://wiki.phpmyadmin.net/pma/Welcome_to_phpMyAdmin_Wiki http://wiki.phpmyadmin.net/pma/Config

Getting the Time a PHP Script Takes to Execute

2011-12-05T13:07:00.001-08:00

If your working with large resource intensive PHP scripts, or are simply looking to refine and optimize an existing bit of code, one of the steps you might take is to look at how long your PHP code is taking to run. We can do this within the PHP code itself by analyzing the time the script is kicked off and comparing it to the time the script completes. I’ve included a simple example of this

How do I connect to my server via IPMI?

2011-12-05T11:13:00.001-08:00

Every server at Softlayer supports IPMI. This provides the ability to remotely power on, power off, and reboot your server. It also provides a Serial Console and/or Keyboard-Video-Mouse as if you were sitting in front of the physical computer. We use the application IPMIView, provided by Supermicro, to connect to the server. The IPMI connection is established over our private VPN network. You can

Password cracking with John the Ripper on Linux

2011-12-05T10:53:00.000-08:00

1. IntroductionFor those of you who haven't yet heard about John the Ripper (hereby called John for brevity), it is a free password cracking tool written mostly in C. Before going any further, we must tell you that although we trust our readers, we do not encourage or condone any malicious activities that may be performed using this tool or any other tools we talked about in the past.

On RHEL 6, SSH, DNS, Firewalls and slow logins

2011-12-02T14:38:00.001-08:00

I recently ran into an issue where SSH was taking a long time (around 20+ seconds) to log in to a number of RHEL 6 boxes. The funny thing was, the issue only occurred at a single co-location facility, all other RHEL 6 systems would login just fine. Turns out this is because the systems at the co-location facility are located behind a Cisco firewall, and between the firewall and the

CentOS: Disable Unneeded Services at Boot Time

2011-12-02T10:38:00.001-08:00

Determine which Services are Enabled at BootRun the command: # chkconfig --list | grep :onThe first column of this output is the name of a service which is currently enabled at boot. Review each listed service to determine whether it can be disabled.If it is appropriate to disable some service srvname , do so using the command: # chkconfig srvname offServices to disable if possibleanacronIs this

Kill list of processes from command line

2011-12-01T13:10:00.000-08:00

kill `ps aux | grep Mozilla | grep -v grep | awk '{print $2}'` OR ps aux | grep www-data | grep -v grep | awk '{print $2}' | xargs kill -9 4 Ways to Kill a Process – kill, killall, pkill, xkillKill command is use to send signal to a process or to kill a process. We typically use kill -SIGNAL PID, where you know the PID of the process.There are other ways to effectively kill a process —

Mac OS X Viruses: How to Remove and Prevent the Mac Protector Malware

2011-12-01T11:14:00.001-08:00

Every Apple fanboy will tell you that Macs are safe from malware, but it’s just not true. Recently a fake AV program has been targeting and infecting OS X computers in the wild. Here’s a quick look at how it works, how to remove it, and also how to prevent it in the first place.The virus in question is actually a fake antivirus and trojan which goes by a few different names. It may present

Ensure High Availability with CentOS 6 Clustering

2011-12-01T10:39:00.001-08:00

http://olex.openlogic.com/wazi/2011/ensure-high-availability-with-centos-6-clustering/

CentOS 6 with chrooted SFTP-only users + SSH hardening

2011-11-30T14:21:00.001-08:00

Having a new server deployment to do, I wanted to take some time to get a working OpenSSH implementation under CentOS 6 to allow for SFTP-only users in a chrooted environment. This process is rather simple (these days) and here’s both my sshd_config file as well as some other notes to help you along your way as well. You’ll note some of the restrictions are excessive for most people but for my

Firefox – tons of tools for web developers

2011-11-28T16:30:00.000-08:00

One of the goals of Firefox have always been to make the lives of web developers as easy and productive as possible, by providing tools and a very extensible web browser to enable people to create amazing things. The idea here is to list a lot of the tools and options available to you as web developers using Firefox.Native developer tools in FirefoxWe are working on building a great set of

CentOS 6 minimal install CD. You may not want to bother with it

2011-11-28T15:34:00.001-08:00

I tried out the CentOS 6 minimal install CD yesterday when installing CentOS 6 for the first time on a virtual server. Just a precaution: It is really minimal. There are no package selection options during the install process and lots of things which I thought would be on a minimal install (you know based on past releases, that kind of thing) were missing which was frustrating. I think I'll

How To Download a RPM Package Using yum Command Without Installing On Linux

2011-11-24T16:13:00.000-08:00

Iwould like to only download the packages via yum and not install/update them. How do I download a RPM package using yum command under CentOS Enterprise Linux server 5.x or RHEL 5.x systems?You need to install plugin called yum-downloadonly. This plugin adds a --downloadonly flag to yum so that yum will only download the packages and not install/update them. Following options supported by this

20 Most Highly Rated GUI Applications to Install from Ubuntu Software Center

2011-11-24T10:21:00.001-08:00

http://www.techdrivein.com/2011/11/20-most-highly-rated-applications-to.html

Linux: 25 PHP Security Best Practices For Sys Admins

2011-11-24T10:17:00.000-08:00

PHP is an open-source server-side scripting language and it is a widely used. The Apache web server provides access to files and content via the HTTP OR HTTPS protocol. A misconfigured server-side scripting language can create all sorts of problems. So, PHP should be used with caution. Here are twenty-fivephp security best practices for sysadmins for configuring PHP securely.Our Sample Setup For

2011-11-18T11:22:00.001-08:00

Command line package administration can be powerful but it’s not obvious at first glance. The commands to list, install, upgrade and uninstall are not using the same shell command. Sometime you need apt-get, sometimes apt-cache, sometimes dpkg,… not very consistent.Some commands are also confusing, for instance: 1bash# apt-get install phpmyadmin will install only the phpmyadmin package. However

Setup & Configuration Of OpenVPN On Pfsense 2.0 RC3

2011-11-17T10:59:00.001-08:00

OutlineWith the recent release of Pfsense 2.0 there has been a significant number of improvements to the OpenVPN component. In previous versions of Pfsense, the client, CA and server certificates had to be created on a client machine and then copied across to the relevant configuration panes in OpenVPN. The client configuration was not bundled as a package for download directly from the Pfsense

Upgrade pfSense 1 to 2 IPsec error

2011-11-17T10:45:00.000-08:00

Solution: Can you try with policy unique and proposal checking strict. I was getting the same errors as you and that worked for me. Also set NAT-T to force REFERENCES http://forum.pfsense.org/index.php/topic,34646.msg197636.html#msg197636

no network after copying ubuntu vmware

2011-11-14T11:49:00.001-08:00

After you copy an Ubuntu image, you'll probably lose your network connectivity. After a little bit of digging, it turns out that Ubuntu persists the MAC address of the network device in /etc/udev/rules.d/*net.rules . The fix: sudo rm /etc/udev/rules.d/*net.rules sudo shutdown -r now #to reboot REFERENCEShttp://muness.blogspot.com/2009/01/no-network-after-copying-ubuntu-vmware.html

MySQL wait_timeout default is set too high!

2011-11-10T15:16:00.001-08:00

Recently an OKPublic server was experiencing fairly sporadic bouts of extreme CPU loads (upwards of 80!) every 6 to 12 hours or so. It was severely limiting the web server. As I was monitoring the running processes, I witnessed several of these bouts and noticed that MySQL processes were spawned repeatedly and in great number; about 3-5 new processes per second. So I initially thought that

MySQL server has gone away max_allowed_packet.

2011-11-10T11:44:00.000-08:00

Most MySQL users have tried getting this rather cryptic error message: “MySQL server has gone away”. The MySQL documentation describes lots of possible reasons for this here:http://dev.mysql.com/doc/refman/5.1/en/gone-away.html However this page is of little help for most users, I think. Dozens of reasons are listed, but except for the trivial ones (like physical connection was lost, the MySQL

CentOS 6 RPMForge/EPEL Repositories

2011-11-10T11:09:00.001-08:00

Server - CentOS The primary reason for adding these repositories is that neither the CentOS repository nor the rpmforge repository contain the same packages that were available in CentOS 5.x. There is some serious lag time which will cripple your ability to move to CentOS 6. Therefore, in order to gain access to all of the necessary packages you will need to add these two repositories.

Famous Perl One-Liners Explained

2011-11-10T11:01:00.000-08:00

Here is the general plan:Part I: File spacing. Part II: Line Numbering. Part III: Calculations. Part IV: String creation. Array creation. Part V: Text conversion and substitution. Part VI: Selective printing and deleting of certain lines. Part VII: Handy regular expressions. Part VIII: Release of perl1line.txt. Part IX: Release of Perl One-Liners e-book. REFERENCEShttp://www.catonmat.net/blog/

Diagnosing slow PHP execution with Xdebug and KCachegrind

2011-11-08T12:00:00.001-08:00

Tracking down a performance issue to the actual PHP app can be hard enough by itself, but what do you do once you’re sure that the app itself is the bottleneck? The excellent Xdebug extension has many useful features for assisting application developers, but today we’ll be looking at one specific feature that can help us see exactly what is slow in the application: profiling.Profiling a PHP

Testing Network Performance and Throughput with Iperf

2011-11-08T11:57:00.001-08:00

Scenario 1: You you have two servers located a large geographical distance apart, say one in The US, the other in the UK. You are copying a large file between these two locations via scp but you are only averaging 200Kbps. You know it should be faster and want to increase the TCP window scaling size according to the bandwidth delay product, but want a reliable way to test the changes easily to

One Liners for Apache Log Files

2011-11-08T11:52:00.000-08:00

I frequently need to look at apache log files to diagnose problems. Over time I’ve developed a series of one liners I can copy and paste to quickly analyze a log file to look for a problems, abuse, popular pages, etc.If someone is reporting a slow site, it can be useful to see if one IP is accesing URLs much more than other IPs since this can be an indication of a poorly written crawler which

Making the CentOS 6 Boot Splash Screen More Verbose

2011-11-08T11:43:00.000-08:00

CentOS 6 comes with a splash screen that displays a progress bar as it boots. This looks nice and might be cool on a desktop for some eye candy but I’d rather watch what is happening. You can hit any key during the boot process to make the boot splash screen disappear and display what its doing when its booting but that’s annoying and I’d rather it have it spit out all the gory details of what

The device, \Device\Harddisk0\DR0, has a bad block.

2011-11-05T18:24:00.001-07:00

That sounds like an issue with your hardrive. It might possibly be manifesting as crashes in some read/write sequences. Prehaps it would be worthwhile checking your hardisks for any faults. Which hardrive do you have (make model)? If your not sure, go into your device manager (Type "Device Manager" in Start search bar. Look under "Disk drives" and make a note of the code and model you see

Using Synergy On Linux And Windows

2011-11-04T17:07:00.000-07:00

REFERENCES http://goinglinux.com/articles/UsingSynergyOnLinuxAndWindows.html

Solution for 504 Gateway Time-out when installing magento

2011-11-01T12:10:00.000-07:00

Have you tried installing magento and then its suddenly stop and display 504 Gateway Time-out on your screen? Last day my task was to install magento on my client's server and this problem occured. I've googled this to solve my problem but unfortunately, I found nothing, maybe because this problem wasn't often to happen. So I've tried to solve it by myself and guess what? I've

Supercharge WordPress

2011-11-01T10:34:00.000-07:00

WordPress, the popular content managing system (CMS), is easy to set up and use, and well supported by both its community and professional consultants. WordPress depends upon a complete stack that comprises an operating system, database, web server, and PHP. If you can optimize this stack, you can enhance the performance of your site. Here are some tricks and best practices for a setup that

Nagios Icinga DISK error

2011-10-31T15:13:00.000-07:00

ERROR: DISK CRITICAL - /home/rdp/.gvfs is not accessible: Permission denied Solution: This is bug #615848. You can either give the nagios user permission to that file or just ignore the file during check. To ignore the file, edit the disk.cfg file located in /etc/nagios-plugins/config and add the arguments [-A -i '.gvfs'] at the end of the command line arguments for the command check_disk

Linux super-duper admin tools: Strace

2011-10-28T10:57:00.000-07:00

In my LKCD and Kdump tutorials, I've mentioned a large number of sequels, including tutorials showing how to work with kernel crash dump processing and analysis tools, how to debug applications and more. Well, one such sequel has just arrived and it's about the most important level II debugging tool available: strace. IntroductionStrace is a utility that can trace system calls. If you're

How to forcibly close a socket in TIME_WAIT?

2011-10-20T15:59:00.000-07:00

Let me elaborate. Transmission Control Protocol (TCP) is designed to be a bidirectional, ordered, and reliable data transmission protocol between two end points (programs). In this context, the term reliable means that it will retransmit the packets if it gets lost in the middle. TCP guarantees the reliability by sending back Acknowledgment (ACK) packets back for a single or a range of packets

debian-security

2011-10-20T15:19:00.000-07:00

# ------------------------------------------------------- # Some common sense basics to secure Debian Linux servers # installing extra security packages apt-get install denyhosts tiger rkhunter chkrootkit snort oinkmaster checksecurity logcheck logwatch fcheck logcheck-database syslog-summary tripwire # after downloading and installing, build the tripwire database: tripwire --init # most of

Apache optimization: KeepAlive On or Off pros and cons?

2011-10-20T12:55:00.000-07:00

Apache is the most widely used web server on the Internet. Knowing how to get the most out of Apache is very important for a systems administrator. Optimizing Apache is always a balancing act. It’s a case of sacrificing one resource in order to obtain savings in another. Apache optimization: KeepAlive On or Off?May 1st, 2011 Apache is the most widely used web

What is the exact difference between a ‘terminal’, a ‘shell’, a ‘tty’ and a ‘console’?

2011-10-20T11:02:00.000-07:00

A great answer by Gilles on stackexchange.comA terminal is at the end of an electric wire, a shell is the home of a turtle, tty is a strange abbreviation and a console is a kind of cabinet.Well, etymologically speaking, anyway.In unix terminology, the short answer is thatterminal = tty = text input/output environment console = physical terminal shell = command line interpreter Console, terminal

Mac OS can't connect to SMB shares after sleep

2011-10-19T12:58:00.000-07:00

http://superuser.com/questions/144327/mac-os-cant-connect-to-smb-shares-after-sleep http://blog.djmnet.org/2009/02/09/macs-needing-unix-network-geekery/

How to find a backdoor in a hacked WordPress

2011-10-19T10:50:00.000-07:00

http://ottopress.com/2009/hacked-wordpress-backdoors/ http://smackdown.blogsblogsblogs.com/2008/06/24/how-to-completely-clean-your-hacked-wordpress-installation/ http://codex.wordpress.org/Hardening_WordPress http://codex.wordpress.org/FAQ_My_site_was_hacked

Use terminal scrollbar with tmux and scrollback

2011-10-18T12:22:00.001-07:00

This is possible in both Screen and in tmux and the workaround is similar: to fool the multiplexers into thinking that the terminal has no "alternate screen" mode (such as that used by pico, mutt, etc). This is accomplished by setting termcap commands for the session. For GNU screen, put this in your .screenrc:termcapinfo xterm*|xs|rxvt|terminal ti@:te@ and for tmux, add this to your .tmux.conf: