Author: Rahul

Openfire is a real time collaboration server. It uses XMPP protocol for instant messaging. This tutorial will help you to install and configure your won instant messaging server using Openfire and Spark. You can configure it to use in your LAN as well as over internet also. Step 1 – Prerequisites Before installing Openfire make sure you have java installed on your system. If you do not have Java installed use following tutorials to install Java on your system. How to Install Oracle JAVA 8 on Debian How to Install Oracle JAVA 8 on Ubuntu & LinuxMint How to Install…

Varnish is an Web accelerator used for content-heavy dynamic web sites. Its used as front-end caching server for web servers. This tutorial will help you to setup Varnish on your System. Step 1: Add Atomic Repository There are latest release available in Atomic repository in RPM format. For RHEL/CentOS 5: # rpm -Uvh http://www6.atomicorp.com/channels/atomic/centos/5EL/i386/RPMS/atomic-release-1.0-16.el5.art.noarch.rpm For RHEL/CentOS 6: # rpm -Uvh http://www6.atomicorp.com/channels/atomic/centos/6/i386/RPMS/atomic-release-1.0-16.el6.art.noarch.rpm Step 2: Install Apache and Configure Use following commands to install Apache on your system. # yum install httpd Configure Apache to work on port 82. Edit Apache configuration file /etc/httpd/conf/httpd.conf and change value of Listen from 80 to…

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…