Author: Rahul

OpenSSH is a widely used software suite for secure remote access to systems and servers over the internet. It provides an encrypted communication channel between two systems, preventing unauthorized access and eavesdropping. However, relying solely on a password for authentication can leave your system vulnerable to brute-force attacks and password guessing. Two-factor authentication (2FA) provides an extra layer of security to OpenSSH by requiring users to provide an additional piece of information, usually a one-time code generated by a mobile app, in addition to their password. In this article, we will explore how to set up OpenSSH with two-factor authentication…

Issue: Today, I found that /tmp was showing 100% full but, After deleting all files from /tmp it was still showing full. After google it, I found that there are some file which deleted from /tmp folder but still used by process used all space. Generally these files used by apache or mysql. Use following command to check files # lsof | grep /tmp mysqld 3236 mysql 6u REG 202,5 0 2373 /tmp/ibZzBzJ8 (deleted) mysqld 3236 mysql 7u REG 202,5 0 2378 /tmp/ibfoQY3a (deleted) mysqld 3236 mysql 11u REG 202,5 0 2393 /tmp/ibz2IDcI (deleted) mysqld 3236 mysql 220u REG 202,5…

Error: Below issue generally comes with database incompatibilities with the current version of MySQL. It may happen due to MySQL server upgrade or downgrade. Error in query (1548): Cannot load from mysql.proc. The table is probably corrupted Solution: This issue may resolve by repairing mysql databse using following command. # mysqlcheck -r mysql proc -u root -p Enter password: mysql.proc OK In case you are still getting same error while accessing proc table, You need to execute mysql_upgrade command to fix issue. Read more about mysql_upgrade # mysql_upgrade -u root -p

While installing magento, if you face issue like below, This the is known issue Error: Exception printing is disabled by default for security reasons. Error log record number: xxxxxx Solution: Step 1. Go to /errors/ folder in magento document root. Step 2. Copy local.xml.sample as local.xml # cp local.xml.sample local.xml Step 3. Edit magento/lib/Zend/Cache/Backend/File.php file, Find and change cache_dir setting. From: protected $_options = array( ‘cache_dir’ => ‘null’, To: protected $_options = array( ‘cache_dir’ => ‘tmp/’, Step 4. Finally create tmp folder in magento document root # mkdir tmp/ Step 5. done

Error: I faced following error after installing ffmpeg on our CentOS 6.5 server. ffmpeg: error while loading shared libraries: libavdevice.so.55: cannot open shared object file: No such file or directory Solution: In my case this issue comes, when we don’t not added codecs libraries path in ldconfig. I have fixed it by adding following entries in /etc/ld.so.conf. # vim /etc/ld.so.conf include ld.so.conf.d/*.conf /usr/lib /usr/local/lib Save file and run command # ldconfig All working now.

Wkhtmltopdf is a very useful application to create pdf from html (webpage). This article will help to create pdf of a webpage using php script and Linux command line tool. Step 1: Install wkhtmltopdf in Linux Download wkhtmltopdf from google code and install to linux system. # cd /opt # wget https://wkhtmltopdf.googlecode.com/files/wkhtmltopdf-0.9.9-static-i386.tar.bz2 # tar xjf wkhtmltopdf-0.9.9-static-i386.tar.bz2 # mv wkhtmltopdf-i386 /usr/bin/wkhtmltopdf # chown apache:apache /usr/bin/wkhtmltopdf # chmod +x /usr/bin/wkhtmltopdf Step 2: Create Pdf Using Command Line First check wkhtmltopdf script it its properly working from command line. Below command will create pdf of http://google.com web page. # /usr/bin/wkhtmltopdf http://google.com google.pdf Step…

If you’re using a Linux machine and want to find your public IP address without visiting a website, you can do so easily from the command line. In this tutorial, we’ll go through the steps to finding your public IP address using a few different methods. How to Check Local IP Address on Linux Finding Your Public IP Address Method 1: Using the dig Command The dig command is used for querying DNS servers, but it can also be used to find your public IP address. Open a terminal and type the following command: dig +short myip.opendns.com @resolver1.opendns.com You should…

VLC Media Player is a free and open-source multimedia player that supports various audio and video formats. It is widely popular among Linux users due to its versatility, simplicity, and robustness. In this article, we will guide you on how to install VLC Media Player on Fedora Linux. There are two ways to install VLC on Fedora – The first method will use the Snap package to install VLC and the second method will use the traditional way with rpm repositories for installing VLC on the Fedora system. Method 1 – Installing VLC using Snap Snapcraft is the latest way…

Hi Guys, This tutorial will help to for installing MySQL 5.6 on CentOS/RHEL system. I am using CentOS 6, 32 bit version. For other OS version you can download files from here. Also change the rpm names in all given commands in this tutorial. Step 1: Download RPMs from MySQL Download required rpm files from MySQL cdn network using following download links. # cd /opt/ # wget http://cdn.mysql.com/Downloads/MySQL-5.6/MySQL-server-5.6.15-1.el6.i686.rpm # wget http://cdn.mysql.com/Downloads/MySQL-5.6/MySQL-client-5.6.15-1.el6.i686.rpm # wget http://cdn.mysql.com/Downloads/MySQL-5.6/MySQL-shared-5.6.15-1.el6.i686.rpm Step 2: Install MysQL RPMs Install downloaded rpms using rpm command line tool. # rpm -ivh MySQL-server-5.6.15-1.el6.i686.rpm # rpm -ivh MySQL-client-5.6.15-1.el6.i686.rpm # rpm -ivh MySQL-shared-5.6.15-1.el6.i686.rpm Step…

Email authentication has become an integral part of today’s digital world. It’s a crucial process that verifies the legitimacy of an email sender. Among the many methods of email authentication, SPF (Sender Policy Framework) is a prominent technique that aids in verifying that the emails are sent from an authorized server and helps in reducing email spam. To bolster the security and reputation of your server, it’s recommended to implement SPF records on your cPanel server. This article will guide you through the process of adding SPF records for all accounts on a cPanel server. Understanding SPF Before we dive…