Start multiple instances of MySQL on the same machine
There are various methods to run multiple instances of mysql (on different ports) on the same machine. Here I have used the same binary and used a separate configuration file (with separate port, pid, socket and data directory). We need to create new directories for our datadir and log folder (if used). Also we need to assign proper permissions on those folders: # mkdir /var/lib/mysql2 # chown -R mysql.mysql...

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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...

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Mozilla Firefox Installation on Fedora Linux
Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. As of October 2010, Firefox is the second most widely used browser, with 30% of worldwide usage share of web browsers. In Germany, Firefox is the most popular browser with 60% usage says Wikipedia. To install Firefox 4 on Fedora Linux, # vim ...

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PowerDNS Installation on Linux
PowerDNS is a DNS server, written in C++ and licensed under the GPL. It runs on most Unix derivatives and on Microsoft Windows. PowerDNS can be managed through a web interface (PowerAdmin). Install MySQL, # yum install mysql* -y After installation, start it and create system startup links for MySQL. # service mysqld start; chkconfig mysqld on If you want to set root password, # mysqladmin -u root...

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Download YouTube Videos in Linux
Do you want to Download your favorite you tube video in Linux? No problem! Here I have mentioned all steps to download you tube video using Linux Terminal. Step 1: Install youtube-dl package by executing, On Ubuntu, $ sudo apt-get install youtube-dl On Fedora, RedHat, CentOS, # yum install youtube-dl -y Step 2: After having successfully installed youtube-dl, open a...

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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...

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Linux Swap Space Configuration ( Using File )
Swap space in Linux is used when the amount of physical memory (RAM) is full. If the system needs more memory resources and the RAM is full, inactive pages in memory are moved to the swap space. While swap space can help machines with a small amount of RAM, it should not be considered a replacement for more RAM. Swap space is located on hard drives, which have a slower access time than physical...

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Linux – Open HTTP Web Server Port 80
The default configuration for firewall is to reject all incoming packets from outside. To allow it, we need to open particular port in Firewall. The default configuration file for iptables based firewall under RHEL / CentOS / Fedora Linux is /etc/sysconfig/iptables. Open /etc/sysconfig/iptables, # vim /etc/sysconfig/iptables Append rule as follows: -A RH-Firewall-1-INPUT -m state...

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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...

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Nikto - Web Server Scanner
Nikto is a web server scanner tool, which performs comprehensive checking against web servers for multiple items, including over 3500 potentially dangerous files/CGIs, versions on over 700 servers, and version specific problems more than 200 servers. Nikto is built on LibWhisker and can run on any platform which has a Perl environment, and supports SSL, proxies, host authentication, IDS...

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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, ...

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eAccelerator Configuration With PHP5
eAccelerator is a free open-source PHP accelerator, optimizer, and dynamic content cache. It increases the performance of PHP scripts by caching them in their compiled state, so that the overhead of compiling is almost completely eliminated. It also optimizes scripts to speed up their execution. eAccelerator typically reduces server load and increases the speed of your PHP code by 1-10 times. I have tested this...

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Performance Monitoring Using “vmstat” on Linux
vmstat reports information about processes, memory, paging, block IO, traps, and cpu activity. The first report produced gives averages since the last reboot. Additional reports give information on a sampling period of length delay. The process and memory reports are instantaneous in either case. [root@linuxArticles.org ~]# vmstat -s 4087800 total memory 1643176 used m...

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Linux Kernel Performance and Tuning with vm.swappiness
vm.swappiness is a tunable kernel parameter that controls how much the kernel favors swap over RAM. At the source code level, it’s also defined as the tendency to steal mapped memory. A high swappiness value means that the kernel will be more apt to unmap mapped pages. A low swappiness value means the opposite, the kernel will be less apt to unmap mapped pages. In other words, the higher the v...

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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...

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SparkleShare
SparkleShare is a syncing and collaboration tool that shines by its absence. it's designed to get out of your way, to make sharing documents and collaboration easier, and to make peers aware of what you are doing says its project site. With SparkleShare, you are given an option to host your remote folder on your own server, Github, Gitorious, The GNOME Project. Sharing...

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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...

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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...

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MemCache Installation On Linux
“MemCached” is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Activate the RPMForge repository, #wget http://packages.sw.be/rpmforge-release/rpmforge-release-0.5.2-2.el5.rf.i386.rpm # rpm -ivh rpmforge-release-0.5.2-2.el5.rf.i386.rpm Now install memcache rpm from rpm...

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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 ...

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GRUB Password Setting in Linux
When your system is rebooted, grub presents the boot option menu called splace screen. From here, you or anybody can easily login into a single user mode (sometimes it is called Rescue Mode) without the password which might result into breaching computer security. You can set a password for the GRUB boot loader. This prevents users from rescue or Singe-User mode or changing settings at boot ...

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SARG
SARG – Squid Analysis Report Generator Configuration is a tool that allow you to view “where” your users are going to on the Internet. SARG provides many information about Squid users activities like, times, bytes, sites, etc… Download latest version of SARG from here. # wget http://...

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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...

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Linux – Switch MySQL to Listen on TCP
By default, MySQL only allows connections from the localhost address – 127.0.0.1. The configuration file is usually found in /etc/my.cnf. To switch MySQL to listen on TCP, Open /etc/my.cnf or /etc/mysql/my.cnf. # vim /etc/my.cnf Modify line as below # bind-address = 127.0.0.1 Save and Exit the file. Now restart the database server by executing, # /e...

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Recover MySQL root Password
Do you lost or forgot mysql root password ? No problem...! You can recover MySQL database server password with following steps. First Stop mysql service. # /etc/init.d/mysqld stop Start MySQL server without password: # mysqld_safe - -skip-grant-tables & Connect to mysql server using mysql client: # mysql -u root Setup new MySQL root user password mysql> use mysql; mysql> update user set p...

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SQUID – Timezone Modifications

Squid is a proxy server and web cache daemon. It has a wide variety of uses, from speeding up a web server by caching repeated requests; to caching web, DNS and other computer network lookups for a group of people sharing network resources; to aiding security by filtering traffic.

Once after you have configured Squid, you may notice at the bottom of error page signature appears with GMT timezone. You might want to change to local timezone.

Generated Mon, 10 Nov 2010 10:49:15 GMT by LinuxArticles.org (squid/2.6.STABLE21)

To change time zone, edit every files stored in /usr/share/squid/errors/English. Put Below signature at the bottom of every page to display local timezone.

< BR clear=”all” >
< HR noshade size=”1px” >
< ADDRESS >
Generated %t by %h (%s)
< /ADDRESS >
< /BODY ></HTML >

Generated 10/Nov/2010 16:21:17 +0530 by LinuxArticles.org (squid/2.6.STABLE21)

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This entry was posted by on May 30, 2011 at 11:06 AM, and is filed under All. Follow any responses to this post through RSS 2.0. You can leave a response or trackback from your own site.

Start multiple instances of MySQL on the same machine

Monitor Failed Login Attempts

Mozilla Firefox Installation on Fedora Linux

PowerDNS Installation on Linux

Download YouTube Videos in Linux

SSH Welcome Banner Configuration In Linux

Linux Swap Space Configuration ( Using File )

Linux – Open HTTP Web Server Port 80

LAMP on Linux Server

Nikto - Web Server Scanner

Release memory in Linux (Unused or Cached)

eAccelerator Configuration With PHP5

Performance Monitoring Using “vmstat” on Linux

Linux Kernel Performance and Tuning with vm.swappiness

Ctrl Alt Delete Deactivation in CentOS / RedHat / Fedora

SparkleShare

Set up Google Public DNS on Linux

Linux - Turn off Beep Sound of Terminal

MemCache Installation On Linux

Difference between su and root

GRUB Password Setting in Linux

SARG

Windows Fonts in Linux

Linux – Switch MySQL to Listen on TCP

Recover MySQL root Password

SQUID – Timezone Modifications

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