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

What is Vagrant? Vagrant is an open-source virtualization manager, used for managing VM(Virtual Machine) and their configurations with few commands. It is supported by VirtualBox, Docker, Hyper-V as well as VMWare virtualization. Vagrants helps managing the configurations of VM created using any of the mentioned virtualization. Its available for Mac OS X,… Continue Reading Simple guide to start using Vagrant with VirtualBox

Date Posted: EFS is a aws service which is similar to NFS service where we can add a single disk across multiple servers. The advantage of using EFS is we dont have to worry about data storage. Limitation: EFS has a limited to few regions as of now and it… Continue Reading Working with EFS (Elastic File System)

Date Posted:11-03-2017 In this post, we deals with how to redirect all non www request to www request. If nginx is not installed, follow the posts. Ubuntu 16.04 Centos 7 Implementation: If you followed the above posts, the default location of nginx configuration is /etc/nginx/sites-enabled/default. Open nginx configuration and add the… Continue Reading Redirect non www request to www nginx

Date Posted:22-02-2017 Its a biggest challenge for a new mail server to reach popular mail provider user’s inbox. One of the best way is to sign the outgoing mail server using dkim. There are multiple ways to implement dkim signing. We are going to use opendkim as a service to… Continue Reading Dkim Setup on Postfix Mailserver – Centos 6/7