Linux Howtos, Linux Tutorials for Administration and Discussion Forum

Howto change MYSQL Root Password on linux CENTOS, REDHAT, FEDORA, UBUNTU, FREEBSD and other Unix – Linux based Operating system

Ashwin — Mon, 19 Sep 2011 17:44:39 +0000

How to change MYSQL Root Password on Linux Distributions like CENTOS, REDHAT, FEDORA, UBUNTU, FREEBSD and other Unix – Linux based Operating system. By default when you install a new Operating System any of the linux variants the best way to install MYSQL would be using yum for RPM based distros or apt-get for debian [...] Related posts:

The Ten Deadliest and Killer Commands on LINUX

Ashwin — Sun, 24 Jul 2011 11:29:29 +0000

Ten Deadliest and Killer Commands on Linux 1. # rm -rf / This command will delete all the files and folders inside your / directory recursively and forcefully. This will give you a GRUB error 15 2. # mkfs.ext3 /dev/sda This will reformat or wipeout all the files of the device that is mentioned after [...] No related posts.

Howto configure Network Time Protocol NTP Server on Linux Centos, Ubuntu, Fedora, RHEL

Ashwin — Mon, 07 Feb 2011 10:29:26 +0000

This tutorial will guide you with step by step installation of NTP Server on your server which can help your local network sync the time with it. Acroynm NTP – Network Time Protocol Question 1 ==> Why do we need network time protocol, why do i need to sync my time with the server. ? [...] Related posts:

How to Change System Timezone on Linux Distros – Centos, Ubuntu, Redhat, Fedora

Ashwin — Mon, 07 Feb 2011 09:45:52 +0000

Many a times after initial installation of Linux operating system we see the date not to be in our local timezone, instead its in default PST time zone, So here are the steps which will guide you to have your local time zone. So lets start the action The system dates are displayed using a [...] Related posts:

Using Sendmail to Relay Mails from Your MSP/ISP in Centos, RHEL, Ubuntu and Other Linux Distros

Ashwin — Sat, 10 Jul 2010 05:59:27 +0000

Do you want to relay mails from your local sendmail server to your ISP. Just follow the below steps Open sendmail.mc using default editor vi, edit, emacs # vi /etc/mail/sendmail.mc define(`SMART_HOST',`[smtp.yourisphost.com]') FEATUREdnl Save the File and exit Open the File authinfo (If not Present Create a New File). vi /etc/mail/authinfo Add the following Line "AuthInfo:smtp.yourisphost.com [...] Related posts:

Finding First Instance of the Pattern Using Grep in Linux

Ashwin — Sat, 10 Jul 2010 05:36:56 +0000

Grep in Linux Have you ever faced a problem grepping (Parsing) for a pattern from a file, Definately being a Linux Administrator you have done it several times but have you came across a situation where from a huge file you only have to parse the first instance of the pattern, grepping the whole file [...] Related posts:

Blocking Specific Sender to Specific Recipient or IPs Spamming Using Sendmail in Linux

Ashwin — Fri, 09 Jul 2010 09:23:19 +0000

Maintaining a MailServer is really a all time headache for Mail Server Admins, specifically to prevent SPAM relayed from you Server or delivered to your server. In this article we would use some inbuilt feature of Sendmail to block users from sending mail to specific users or domains, this can be attained in many ways [...] Related posts:

Packet Capturing and Analayzing packets Using TCPDUMP on Centos, Fedora, Ubuntu and other Linux Distros

Ashwin — Thu, 08 Jul 2010 09:08:53 +0000

Many a times Linux System Admin2 face problem in network latency, connectivity the servers hampers the services which impact to the business. Using linux basic tools can not really solve it but you can identify the issues faced by the host to host or host to the device. Here we will be using tcpdump tool [...] Related posts:

Solved : Lock table is out of available locker entries – Yum install, yum upgrade

Ashwin — Tue, 29 Jun 2010 06:51:07 +0000

Recently faced a issue while installing a package using yum [root@back ~]# yum install mod-security rpmdb: Lock table is out of available locker entries rpmdb: Unknown locker ID: 3077 error: db4 error(22) from db->close: Invalid argument error: cannot open Packages index using db3 - Cannot allocate memory (12) error: cannot open Packages database in /var/lib/rpm [...] Related posts:

How to Install Mod Security on Linux Centos 5.4, Fedora 11-12

Ashwin — Sat, 05 Jun 2010 11:12:33 +0000

ModSecurity is a free open source Firewall for Web application which can help you to guard against Intrusion on your webservers like local file inclusion attacks, Cross Site Scripting, and SQL injection vulnerabilities and many more. The easiest way to install mod_security is using yum, to get the latest package of modsecurity refer to jason [...] Related posts: