tag:blogger.com,1999:blog-5288382310076556802017-07-14T20:16:30.176-07:00Adminnoreply@blogger.comBlogger586125tag:blogger.com,1999:blog-528838231007655680.post-20223449616366411122017-04-05T22:06:00.014-07:002017-04-05T22:06:52.032-07:00

Hamachi is used or setup VPN and connect system with each other using vpn network. For this tutorial I have already created hamachi network from its web interface and get a network id and connected a windows system with this network. This tutorial will help you to add Linux machine to this existing network and communicate other systems ( windows + linux ) on this network. Network ID:

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-22744022432896788162017-04-05T22:06:00.011-07:002017-04-05T22:06:38.808-07:00

Mod_Security is a Web Application Firewall that execute as a Module on your Web Server and provides protection against various attacks to our web applications. It monitors HTTP traffic and performs real time analysis. It’s a product developed by Breach Security and is available a free software under the GNU License. It is Available for Apache, Nginx and IIS. Mod_Security can be deployed and

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-22997525104092507732017-04-05T22:06:00.008-07:002017-04-05T22:06:28.069-07:00

While connecting to remote server from Nagios server using NRPE, Some times we faced this issue “CHECK_NRPE: Error – Could not complete SSL handshake.” If you see this error, don’t panic. This issue can be solve easily within minute. Issue/Error: Getting error “CHECK_NRPE: Error – Could not complete SSL handshake” while connecting nagios server trying to connect remote NRPE server. # /usr

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-37553828472288007702017-04-05T22:06:00.005-07:002017-04-05T22:06:17.039-07:00

VirtualHosting is an implementation of hosting multiple domains on single server. It enabled to utilize maximum resources of server and reduces cost. Now a days mostly all web servers supports virtualhosting environment. In our earlier article we describe to install Lighttpd server on CentOS/RHEL. This article will help you to setup VirtualHosts in Lighttpd server. For example we are using

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-73421481023454671922017-04-05T22:06:00.002-07:002017-04-05T22:06:06.213-07:00

All the sites running with SSL are used https protocol on default port 443. SSL provides secure data communication by encrypting data between server and client. In our earlier articles we have described about installing lighttpd and creating virtualhosts in CentOS/RHEL systems. This article will help you to configure SSL in Lighttpd server. For this example we are using an self signed

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-74703995490910312312017-04-05T22:04:00.005-07:002017-04-05T22:04:32.967-07:00

S3cmd is created for managing S3 buckets on Linux servers. But we also use this tool on windows servers as well. This article will help you to setup s3cmd in windows systems. If you are searching here to setup s3cmd on Linux system read next article install s3cmd on Linux. S3cmd System Requirements: s3cmd required Python 2.4 or greater version to run. We also need to install GPG. Step 1:

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-6234485653113527992017-04-05T22:04:00.002-07:002017-04-05T22:04:19.687-07:00

MariaDB is an relational database management system (RDBMS). Generally we use single node of database server for small application but think about application which have thousands of users keep online at a time, In that situation we need a structure which will capable to handle this load and provides high availability. So we need to add multiple database servers interconnected with each

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-12591147506921185282017-04-05T22:03:00.003-07:002017-04-05T22:03:34.227-07:00

Crontabs are very useful in Linux for scheduling repeated jobs. We can schedule any script or command to run on particular time interval. All the jobs executed by cron runs in background. As a system admin, we know the importance of backups of system or application configuration files and we do it through cronjob but most of time to forget to take back of cronjobs. This article will describe

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-84220831288753947762017-04-05T21:56:00.000-07:002017-04-05T22:02:34.199-07:00

MariaDB has more features and advantages over MySQL server described here. If you are thinking to switch to MariaDB, this article will help you. Today I am going to show you how to replace MySQL with MariaDB with all you existing Data in Linux CentOS. To do This we are going to follow these steps as root. Step 1: Backup Existing Databases Firstly take a backup of all existing databases, In

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-82093642729676317692017-04-05T21:55:00.009-07:002017-04-05T22:02:34.186-07:00

In the Global word, we always wants to keep connect to everyone. To accomplish this email is also a very popular method to send and receive information. Linux systems also provides tools to send emails from command line which is useful to get system details, to send emails from shell scripts etc. When we simply send email from Linux terminal, email send as system username@hostname. Some of

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-31901804766490743622017-04-05T21:55:00.006-07:002017-04-05T22:02:34.038-07:00

Port Knocking is a technique used to secure connections or port access from unwanted users. Using this technique we maintain one or more previously configured ports closed and these will only be opened using a sequence of requests to a number of ports that wepreviouslyset . To give an example , if we configure port Knocking access to port 50, this port will only be open when we make requests

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-23599078293313825182017-04-05T21:55:00.003-07:002017-04-05T22:02:34.004-07:00

RAID stands for Redundant Array of Inexpensive (Independent) Disks. RAID-1 is also known as striping. RAID-1 required minimum two disks. The max data on RAID-1 can be stored to size of smallest disk in RAID array. In this article we are using CentOS 6.5 running with VMWare. I have added two virtual disks as /dev/sdb and /dev/sdc for configuring RAID-1 partition. Each disk size is 10GB and we

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-1335984118143795982017-04-05T21:55:00.000-07:002017-04-05T22:02:33.974-07:00

In the previous article we describe to how to Setup RAID-1 in RHEL/CentOS systems. Some times disks attached with the array get failed working, RAID simply mark it as faulty device and do not use it any more. In that situation we need to replace the faulty device with new working device. The below image is showing that /dev/sdc1 disk has been marked as faulty and new disk attached has taken

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-62577846368562284292017-04-05T21:54:00.009-07:002017-04-05T22:02:34.141-07:00

While working with bash programming, we many times need to check if file already exists, create new files, inserts data in files. Also some times we required to execute other scripts from other scripts. This article has few details about testing file and directories existence in system. Which can be very helpful for you while writing shell scripting. 1. Bash Shell – Test if File Exists If

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Lighttpd is high performance web server created suitable for running on production environment. It is highly optimize, secure and very flexible web server. Lighttpd utilize very low Memory and CPU than other web servers. Its event-driven architecture is optimized for a large number of parallel connections (keep-alive) Lighttpd powers several popular Web 2.0 sites. It provides high speed

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-28795383020713435532017-04-05T21:54:00.003-07:002017-04-05T22:02:34.020-07:00

Lighttpd is an alternative to Apache. It is a opensource web server. Lighttpd is popular for its low memory and cpu uses, This can be best option for high traffic sites. PHP is a programming language used server-side programming. MariaDB is an alternative of MySQL with various of enhancements. Step 1: Add Required Yum Repositories Before starting setup, make sure that we have required yum

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-32232496990243801082017-04-05T21:54:00.001-07:002017-04-05T22:02:34.041-07:00

Ubuntu 14.04 LTS (Trusty Tahr) is has been released publicly on April 17, 2014. Ubuntu provides and release upgrader by which we can easily upgrade our system to latest available release. This article will help you to upgrade Ubuntu 12.04 LTS to Ubuntu 14.04 LTS. Read more about Ubuntu 14.04 LTS. Note: Before starting release upgrade on Ubuntu, We recommend to take backup of impotent data

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-655695584868383992017-04-05T21:53:00.008-07:002017-04-05T22:02:34.147-07:00

EPEL or “Extra Packages for Enterprise Linux” is an online yum repository providing high quality of rpm packages. These packages are developed and tested on fedora, which is available for RHEL. RHEL 7 beta packages are also available to install now. 1. Add EPEL Repository Download and install epel-release package as per your system version and architecture. Basically they provides noarch

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-91937351075718204582017-04-05T21:53:00.006-07:002017-04-05T22:02:34.202-07:00

XCache is a fast, stable PHP opcode cacher. This relatively new opcode caching software has been developed by mOo. XCache optimizes performance caching the compiled state of PHP scripts into the RAM and uses the compiled version straight from the RAM. This may increase php execution 1-5 times faster than default installation. Read more about XCache. Step 1: Install XCache PHP Module in

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-59169696979491213912017-04-05T21:53:00.003-07:002017-04-05T22:02:34.109-07:00

Mencoder is a companion program to the MPlayer media player that can be used to encode or transform any audio or video stream that MPlayer can read. See the RestrictedFormats wiki page for instructions for enabling non-free formats in MPlayer and gmplayer. For more information visit the MPlayer web site. Step 1. Install MenCoder and MPlayer CentOS/RHEL and Fedora users, make sure that you

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-39030353510651784192017-04-05T21:53:00.001-07:002017-04-05T22:02:34.063-07:00

VsFTPd stands for Very Secure FTP Daemon. VSFTPD is the most popular ftp server. Also probably the most secure and fastest FTP server for UNIX-like systems. If you are searching an FTP server which can provide you Security, Performance and Stability then your searching is finished here, vsFTPd can be best suitable option for you. This article will help you to setup vsFTPd server on CentOS/

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-19796895790554122332017-04-05T21:52:00.009-07:002017-04-05T22:02:33.994-07:00

s3.exe is a standalone windows command line utility available for managing s3 buckets and EC2 environments. this file don’t required any installation. To work with this script, we just need to have installed .Net framework 2.0 or above version. As much as I know, this script has limited options but it will be helpful for you for s3 bucket tasks and managing snapshots of EBS volumes.

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-44186605850191183352017-04-05T21:52:00.006-07:002017-04-05T22:02:34.082-07:00

MariaDB 10.0 stable version has been released on Mar 31, 2014. It is an enhanced, drop-in replacement for MySQL. MariaDB can be an better choice for choice for database professionals looking for a robust, scalable, and reliable SQL server. MariaDB has a number of updated features over MySQL. Use below links to read features comparison between MariaDB and MySQL This article will help you to

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As a System Administrator I don’t prefer to use / directory to store MySQL data files. Each time when I install MySQL for a production server, I tried to use secondary disk for storing application and database file. In that way I always change the default data directory of MySQL to secondary disk mounted on system. Mostly MySQL uses /var/lib/mysql directory as default data directory for

Adminnoreply@blogger.com0tag:blogger.com,1999:blog-528838231007655680.post-60553615883160465072017-04-05T21:52:00.001-07:002017-04-05T22:02:34.126-07:00

In earlier articles we have provided the steps to install MongoDB on CentOS and RHEL or Ubuntu and Debian Systems. Now find this article to how to create and drop database in MongoDB. 1. Create Database in MongoDB It’s strange to listen but true that MongoDB doesn’t provide any command to create databases. Then the question is how would we create database ?. The answer is – We don’t create

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