centOSTag Archive

Install iotop on linux host Iotop is utility used to identify which process, user consumes more io. This post explains on how to install iptop on linux host. By default iostat won’t be come by default. Implementation: On ubuntu host, execute the following command to install iotop. Press y to… Continue Reading Install iotop on linux host

Yum roll back an update on centos: Date Posted: 16-06-2017 There are few scenarios after installing new packages, some functionality may break. In such scenario, its hard to figure out what went wrong so we immediately want to revert back. In this post, we will explain on how to roll… Continue Reading Yum roll back an update on centos

Install Fail2ban on Centos 7 Date Posted: 13-06-2017 Fail2ban is a service used to ban IP address which makes unsuccessful attempts. In this post, we will explain on how to install fail2ban on centos server. Implementation: Fail2ban normally available on epel  repo. Incase if epel package is not installed then install… Continue Reading Install Fail2ban on Centos 7

Install and Configure Nagios Server Date Posted: 08-06-2017 Nagios is an open source monitor tool widely used to monitor client machines. Here, we are going to explain on how to install and configure nagios server. Prerequisites: Centos 7.0 Server – In this post, we are using centos server 7.0. We… Continue Reading Install and Configure Nagios Server

Introduction Vagrant is an open-source tool used to create, configure, and manage virtual development environments using a simple command-line interface. It works with virtualization providers such as VirtualBox, VMware, Hyper-V, and Docker. Vagrant allows developers and system administrators to create reproducible and portable virtual environments with predefined configurations. Instead of… Continue Reading Simple guide to start using Vagrant with VirtualBox

Introduction EFS can be used in scenarios where multiple servers need access to the same files and directories. Similar to NFS, an EFS file system can be mounted on multiple instances within the same AWS Region. Prerequisites Limitations Implementation Step 1: Create an EFS File System Log in to the… Continue Reading Working with EFS (Elastic File System)

Introduction Redirecting non-www requests to www is a common web server configuration used to maintain a consistent website URL. Nginx can handle this redirection using a simple server block configuration. This helps ensure that visitors accessing the website without www are automatically redirected to the www version. A permanent 301… Continue Reading How to Configure Nginx to Redirect Non-WWW to WWW

Introduction Email deliverability is one of the major challenges when setting up a new mail server. Emails sent from an untrusted or unauthenticated mail server may be delivered to spam folders or rejected by popular email providers. DomainKeys Identified Mail (DKIM) is an email authentication mechanism that allows an outgoing… Continue Reading DKIM Setup on Postfix Mail Server Using OpenDKIM – CentOS 6/7