Backup MySQL Table Structure To a File
The mysqldump client is a backup program originally written by Igor Romanenko. It can be used to dump a database or a collection of databases for backup or transfer to another SQL server (not necessarily a MySQL server). The dump typically contains SQL statements to create the table, populate it, or both. However, mysqldump can also be used to generate files in CSV, other delimited text, or XML...

More
RRDTOOL Installation on Linux
RRDtool is the Open Source industry standard, high performance data logging and graphing system for time series data. Use it to write your custom monitoring shell scripts or create whole applications using its Perl, Python, Ruby, TCL or PHP bindings. RRDTOOL is required by many network monitoring utilities like cacti, nagios & many others. To install RRDTool CentOS/Red Hat, # wget...

More
Hard Drive Tuning with hdparm
hdparm provides a command line interface to various kernel interfaces supported by the Linux SATA/PATA/SAS "libata" subsystem and the older IDE driver subsystem. Many newer (2008 and later) USB drive enclosures now also support "SAT" (SCSI-ATA Command Translation) and therefore may also work with hdparm. To see how your hard disk does compare: # hdparm -t...

More
Multi Router Traffic Grapher – MRTG on Linux
The Multi Router Traffic Grapher (MRTG) is a network or resource monitoring tool used by System Administrators across the Globe. MRTG generates HTML pages containing PNG images, which provides a real time visual representation of network traffic and system resources. STEP 1: Install MRTG with required packages # yum install mrtg net-snmp net-snmp-utils -y STEP 2:...

More
Set up Google Public DNS on Linux
Google has recently released their very own DNS resolver with main goals of making web browsing faster and safer. Since Google's search engine already crawls the web on a daily basis and in the process resolves and caches DNS information, they wanted to make use of their technology to experiment with new ways of addressing some of the existing DNS challenges around performance and security. For advanced...

More
Mount ISO Image Under Linux
An ISO image is an disk image of an optical disc using a conventional ISO format. ISO image files typically have a file extension of .ISO. The name "ISO" is taken from the ISO 9660 file system used with CD-ROM media, but an ISO image can also contain UDF file system because UDF is backward-compatible to ISO 9660. You can mount an ISO images via the loop device under Linux. To mount ISO...

More
Ctrl Alt Delete Deactivation in CentOS / RedHat / Fedora
Anyone who has physical access to the keyboard can simply use the Ctrl Alt Delete key combination to reboot the server without passing any authentication credentials to server. To disable Ctrl Alt Delete, update /etc/inittab and make sure following line is commented out: # vim /etc/inittab # ca::ctrlaltdel:/sbin/shutdown -t3 -r now Save and exit...

More
Monitor Failed Login Attempts
In Linux you can use faillog command to display failed login attempts or you can set login failure limits. faillog formats the contents of the failure log from /var/log/faillog database / secure log file. It also can be used for maintains failure counters and limits. For RHEL/CentOS Linux 5.x, you need to modify /etc/pam.d/system-auth file to monitor or track failed login attempts. You need to...

More
Difference between su and root
As you login as “root” right from booting the system, all the privileges are set to root, what makes your system more vulnerable to your own mistakes and those wishing to enter your system. As you login as normal user, the privileges are limited, thus it´s safer. To be able to do administrative tasks you can temporally login as root using “su” in a console/terminal, that way the root privileges ...

More
Honeypot for SSH - Kojoney Installation and Configuration
In computer terminology, a honeypot is a trap set to detect, deflect, or in some manner counteract attempts at unauthorized use of information systems. Generally it consists of a computer, data, or a network site that appears to be part of a network, but is actually isolated, (un)protected, and monitored, and which seems to contain information or a resource of value to attackers. STEP 1:...

More
LAMP on Linux Server
You may have heard of a server system called LAMP, and wondered what it is. Well, the answer is that LAMP isn't any one thing on its own - it's actually a combination of four technologies. Together, the LAMP technologies form the most popular overall server system on the web today. LAMP is short for Linux, Apache, MySQL, PHP. This will guide you to install LAMP server on your Linux System. Note: I...

More
Ubuntu Linux - Flush DNS cache
Sometimes you may get old web results and old webpages even after updating the web pages. That means, DNS cache holds the problem. To solve this problem, execute below command to flush DNS cache. # /etc/rc.d/init.d/nscd restart

More
Access Windows NTFS Partitions From Linux
Reading or accessing NTFS partitions in Linux is important for many reasons. NTFS-3G is an open source cross-platform implementation of the Microsoft Windows NTFS file system with read-write support. NTFS-3G often uses the FUSE file system interface, so it can run unmodified on many different operating systems. Before we start, make sure that you have rpmforge repository configured. If you do not have,...

More
Release memory in Linux (Unused or Cached)
In computer science, Memory Leakage occurs when a computer software or program consumes required memory but unable to memory after completing its task or when no longer needed to Operating System. There are two types of Memory Leakage. One is Virtual Memory Leakage and another is Real Memory Leakage. Now first Identify cached memory or unused memory by executing, ...

More
YUM – Exclude Package Update
YUM is an interactive, rpm based, package manager. It can automatically perform system updates, including dependency analysis and obsolete processing based on "repository" metadata. It can also perform installation of new packages, removal of old packages and perform queries on the installed and/or available packages among many other commands/services (see below). yum is similar to other high level package ...

More
Linux - Turn off Beep Sound of Terminal
Linux kernel has PC speaker bell driver called pcspkr.ko. It is responsible for generating beeps while users are working on Shell Prompts ( Both Virtual and GUI Terminals ). If you don't like it, simply remove driver from kernel. Login as a root and type the following command to unload the driver: # rmmod -v pcspkr Sample output: rmmod pcspkr, wait=no We...

More
Back Up files by sending it to Gmail
Nowadays, GMail servers are very much reliable and give you a couple of GiBs for free of cost! So, it is the best place to store your linux system's important data. In order to accomplish this, first create a directory named “backup” in the root directory of your system: # cd / && mkdir backup Now, you need to create a script, which will perform backup and mail it for you...

More
SSH Welcome Banner Configuration In Linux
Every time I connect to Linux server, I receive the same message and I’m getting tired of seeing it, so I decided to change the message to something else. Here’s the message that I get every time: [root@server1 ~]# ssh linuxarticles.org root@linuxarticles.org's password: Last login: Mon Oct 11 18:58:43 2010 from loc...

More
Dropbox
Dropbox is a Web-based file hosting service operated by Dropbox, Inc. which uses cloud computing to enable users to store and share files and folders with others across the Internet using file synchronization. It was founded in 2007 by MIT graduates Drew Houston and Arash Ferdowsi as a Y Combinator startup says Wikipedia. To install DropBox on your system, download appropriate rpm for your...

More
MySQL – Basic Commands To Know
MySQL is a simple SQL shell (with GNU read line capabilities). It supports interactive and non interactive use. When used interactively, query results are presented in an ASCII-table format. When used non interactively (for example, as a filter), the result is presented in tab-separated format. The output format can be changed using command options. After Installation of MySQL on Linux System, start it by, #...

More
Ubuntu - Track MySQL Queries with mysqlsniffer
Wireshark Network Analyzer is use full to track network packets. To sniff MySQL packets and decoding it, we will use mysqlsniffer. Note: This will not usually work for local connections. First, install libpcap-dev, which is the development library that allows an application to sniff network packets. $ sudo apt-get install ...

More
Convert DEB to RPM or RPM to DEB Package
You can convert DEB file to RPM package and RPM to DEB package using alien command, if you have a *.rpm file that you want to install on a Debian or Ubuntu. Convert RPM to DEB Install alien command on Ubuntu as mentioned here: # sudo apt-get install alien Now, use alien command to convert rpm to deb file, # alien...

More
Windows Fonts in Linux
Do you want to create a document using windows fonts in Linux? No problem, please install windows fonts using one of mentioned method. Method 1: Copy the *.ttf (True Type Fonts) fonts like Arial, Tahoma, Verdana, Courier New and Times New Roman from the windows partition to the fonts:// location in nautilus. Method 2: For Ubuntu users, and since Ubuntu does not have a...

More
Restricting users from using the same old password in Linux
For Authentication, Account Management and Authorization, PAM is the core module and pam_unix provides mentioned functionality. Same module can be used to maintain a list of old passwords for every user. This is useful if you want to disallow use of old passwords. You can find out old password list from /etc/security/opasswd file. Open /etc/pam.d/system-auth file of Fedora Core or Red Hat or...

More
SSH Brute Force Attacks Protection using DenyHosts
You can easily block SSH server attacks including dictionary based attacks and brute force attacks using a Python based script - DenyHosts. It analyzes the sshd log messages to determine what hosts or IPs are attempting to hack into your system. STEP 1: Enable Rpmforge Repo in your system, For 32bit CentOS / RHEL Linux enter: # rpm -Uhv...

More

Change console font in Fedora

Ever had the need to change the console font in fedora? Sometimes you need to change it based on your requirements and font support like Greek fonts. The fonts that can be used by the console are kept in the /lib/kbd/consolefonts/ directory.

You can define the desired font in the /etc/sysconfig/i18n file by modifying the SYSCONF entry. I used the iso06.14.gz font, so my SYSFONT variable contains this:

SYSFONT=”iso06.14″

About the author

Cyber Security Analyst, 1st Non-Red Hat RHCA of India, RHCSS, RHCDS

Print article

This entry was posted by Dhaval Soni on August 11, 2011 at 10:33 PM, and is filed under All, CentOS, Fedora, Linux OS, Red Hat. Follow any responses to this post through RSS 2.0. You can leave a response or trackback from your own site.

Backup MySQL Table Structure To a File

RRDTOOL Installation on Linux

Hard Drive Tuning with hdparm

Multi Router Traffic Grapher – MRTG on Linux

Set up Google Public DNS on Linux

Mount ISO Image Under Linux

Ctrl Alt Delete Deactivation in CentOS / RedHat / Fedora

Monitor Failed Login Attempts

Difference between su and root

Honeypot for SSH - Kojoney Installation and Configuration

LAMP on Linux Server

Ubuntu Linux - Flush DNS cache

Access Windows NTFS Partitions From Linux

Release memory in Linux (Unused or Cached)

YUM – Exclude Package Update

Linux - Turn off Beep Sound of Terminal

Back Up files by sending it to Gmail

SSH Welcome Banner Configuration In Linux

Dropbox

MySQL – Basic Commands To Know

Ubuntu - Track MySQL Queries with mysqlsniffer

Convert DEB to RPM or RPM to DEB Package

Windows Fonts in Linux

Restricting users from using the same old password in Linux

SSH Brute Force Attacks Protection using DenyHosts

Change console font in Fedora

Related Articles:

About the author

Search

Categories

Archives

Recent Posts

Who's Online

Change console font in Fedora

Related Articles:

About the author

Search

Categories

Tag Cloud

Popular Posts

Archives

Recent Posts

User Login

Who's Online