Author: Rahul

I, Rahul Kumar am the founder and chief editor of TecAdmin.net. I am a Red Hat Certified Engineer (RHCE) and working as an IT professional since 2009..

Sometimes we need to insert a line at middle of the existing file. You can add line at specific line number using Linux command line or shell scripts. In this tutorial, we will discuss about adding a text line at middle of file as specific line number. Let’s have an example, I have a text file named file1.txt with following content: cat file1.txt this is line one this is line two this is line three Now I have to insert text “HelloWorld” at the line number 3. To do this run the following command. sed -i ‘3iHelloWorld’ file1.txt Details of…

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Being a system administrator you have all responsibilities to maintain your systems. A system admin is a person having good knowledge about operating systems, networking and applications. Also he must have some primary knowledge about system hardware and software. The responsibilities also varies based on location, organization and infrastructure. Primary Responsibilities of A System Administrator Being a Linux/Windows/Cloud Administrator your primary responsibilities are: User account management. Creating new users and groups. Configure security policies. Changing user passwords at regular intervals. Analyze user security pocily on regular time interval. Data backup and recovery. A good system admin always has a data…

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Introduction In the dynamic world of information technology, keeping your systems up-to-date is crucial for security, performance, and stability. This is especially true for users of CentOS and Red Hat Enterprise Linux (RHEL), two of the most popular Linux distributions in the corporate world. This comprehensive guide will delve into the best practices, tools, and strategies to ensure your CentOS and RHEL systems are always current. Understanding the Importance of Regular Updates Updates in CentOS and RHEL include security patches, bug fixes, and occasionally, new features. Regular updates help protect your systems from vulnerabilities, improve functionality, and ensure compatibility with…

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As a system administrator, you need to take backup on daily basis. Backups are very useful to recover data from any crashes or corruption. I have written a simple script to take database backup from MySQL server and upload it to FTP server. Being a system administrator, I recommend keeping a remote copy of your every backup. You can also try our new advance script for MySQL databases backup and upload to remote locations. Create a shell script file and copy the below script. Then update all the required values and execute.

Setup Details – Edit the above script…

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Linux servers power many of the world’s applications and services, making them a popular target for attackers. Ensuring the security of your Linux server is critical to protect sensitive data and maintain system stability. In this comprehensive guide, we’ll discuss various strategies to harden your Linux server, covering aspects like system updates, user management, file permissions, and more. 1. Regular System Updates One of the most effective ways to improve your server’s security is to keep your system up-to-date with the latest patches and security fixes. Regularly updating your Linux distribution will ensure that you’re protected against known vulnerabilities and…

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Losing or forgetting the root password for MySQL can be a frustrating experience. However, fear not, as this guide will walk you through the process of resetting your MySQL root password on Linux systems step by step. By following these instructions, you’ll be back in control of your MySQL server in no time. Prerequisites Before we begin, make sure you have: Access to the Linux server running MySQL with root privileges or sudo access. MySQL or MariaDB installed on the server. Step 1: Stop the MySQL Service The first step is to stop the MySQL service to perform maintenance tasks.…

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MySQL is one of the most popular open-source relational database management systems used worldwide. As your data grows, it becomes increasingly important to safeguard it by implementing regular backups and having a reliable restoration process. In this article, we will provide a comprehensive guide to MySQL database backup and restoration, covering best practices and tools that will ensure the integrity and availability of your data. Backup Methods There are several methods to create a MySQL database backup, including: Using mysqldump Using MySQL Enterprise Backup (commercial) Using binary log-based incremental backups Using file system snapshots We will focus on the most…

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FreeRadius is an implementation of RADIUS server. Its support multiple types of authentication. This article will help you to setup freeradius authentication with OpenLDAP. Step 1: Setup OpenLDAP Server First its required to setup openldap server to complete below setup. Use below link to install it. Setup Openldap Server on CentOS, RHEL System Step 2: Install freeradius Packages Install all freeradius2 server packages on your system using following command. # yum install freeradius2 freeradius2-utils freeradius2-ldap Step 3: Download Schema File Download radius ldap schema file and copy to ldap schema directory using below commands. 3.1 Download File # wget http://open.rhx.it/phamm/schema/radius.schema…

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OpenLDAP is an opensource implementation of Lightweight Directory Access Protocal. Read more about OpenLDAP Project. I am using CentOS 5 for configuring OpenLDAP server. Below are the steps which I have performed during configuration. This article will help you step by step to Install and Configure OpenLDAP Server. Network Details: Below is the network details used while writing this article. System name: openldap.example.com System IP: 192.168.10.50 Domain Name: example.com Step 1: Create Test Accounts Firsty create two test user accounts in your linux system using following commnands. # useradd ldapuser1 # useradd ldapuser2 # passwd ldapuser1 # passwd ldapuser2 Step…

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MySQL is a database system that stores data for websites. It is a type of RDBMS, or Relational Database Management System. This means that it organizes data into tables, and you can access and update the data using SQL commands. MySQL is used by many popular websites, including Facebook, Twitter, and YouTube. It is also used by some large organizations, such as the US Census Bureau and the National Weather Service. MySQL is free and open-source software, so anyone can download it and use it for their own website. MySQL runs on a server, which means you need to have…

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