System Requirements: Red Hat Subscriptions: You must have an active OpenShift Container Platform subscription on your Red Hat account to proceed. Minimum Hardware Requirements: For Master: 2 Physical or virtual system. Base OS: RHEL 7.3 or 7.4 with the “Minimal” installation. 2 vCPU. (You can use 1 CPU for testing […]

RedHat OpenShift Installation on RHEL 7


MYSQL Database Backup and Rsync Bash Script. A bash script is a great and powerful utility to automate the “MySQL” backup in Linux like environment. With the help of Bash script, you can take dump automatically at a defined time and transfer that dump to any remote location with the […]

MYSQL Database Backup and Rsync Bash Script



Benefits of Docker Containers Docker Container has many benefits over physical and virtualized systems, here we are mentioning some points. Portability: let’s suppose in the case of Linux you have your own customized Nginx container. You can run that Nginx container anywhere, no matter it’s a cloud or Data Center on […]

Benefits of Docker Containers a simpler way.


Difference between entrypoint and CMD in Dockerfile or Docker. CMD is nothing but argument to the EntryPoint by default docker uses “/bin/sh -c” as an entry point. So if we are defining only CMD in docker file it uses “/bin/sh -c” for example, If dockerfile will having below format, CMD […]

Difference between entrypoint and CMD in Dockerfile.



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Kubernetes Secure ETCD Data Store Cluster with TLS Certificate configuration Step by Step. This article is all about configuration of ETCD kubernetes data store with high security  measurement. We will use TLS/SSL certificate so that all communication within cluster will secure and private. Environment: 3 RHEL 7 / Centos 7 […]

Kubernetes ETCD Data Store Cluster with TLS Certificate.


Apache Tomcat Installation on Linux (RHEL 7 and Centos 7) in Highly Secure Mode Apache Tomcat, often referred to as Tomcat Server, is an open-source Java Servlet Container developed by the Apache Software Foundation (ASF). Tomcat implements several Java EE specifications including Java Servlet, JavaServer Pages (JSP), Java EL, and […]

Apache Tomcat Installation on Linux, RHEL 7 and Centos ...



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Installing Kubernetes on Centos 7/RHEL7 with kubeadm step by step. Overview Kubeadm is utility which is currently is in alpha which provides kubernetes very easily. Prerequisites 1. One or more physical and virtual machines running CentOS 7 or RHEL 7. 2. 1GB or more of RAM per machine . 3. […]

Installing Kubernetes on Centos 7/RHEL7 with kubeadm.


First installing Realtek wifi driver in Ubuntu, use below command for the same. #sudo apt-get install linux-headers-generic build-essential git #git clone https://github.com/lwfinger/rtlwifi_new.git #cd rtlwifi_new #make #sudo make install #sudo modprobe rtl8723be Disable WiFi power saving mode by below command. #sudo vi /etc/modprobe.d/rtl8723be.conf and type below parameter in to above file. […]

How to resolve Hp – Ubuntu 16 and Linux mint ...



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Zimbra by default, saves email for 5 days if the quota of a mailbox is exceeded. Zimbra then sends the email to the recipient if (during this time) the mailbox has space. This can be a huge a problem if you have thousands of mailboxes. In this KB, we will drop an […]

Send an immediate bounce to recipient when user quota is ...


Qmail is one of the oldest mailing system of this world. It is also the  pioneer of mailing system, Most of the modern mailing system was built keeping qmail in mind.In this small tutorial we will show you how to change maximum mailing size in qmail. # Below command will […]

Changing maximum mail size in Qmail



Linux users are very font of ISO files as this is the most common format that Linux distributions come in. You can use them as local repositories/media to update. By the help of fallowing process you can able to mount iso files in your local system or server. #Login via […]

How to mount Iso file in Linux RHEL entos Ubantu


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Many time after changing the femware of LVM or removing the disk/LUN’s without clean shutdown/unmount you may get fallowing error: /dev/sdf: read failed after 0 of 4096 at 0: Input/output error /dev/sdf: read failed after 0 of 4096 at 3298534817792: Input/output error /dev/sdf: read failed after 0 of 4096 at […]

How to remove LVM Input/output error



Logrotate is designed to ease administration of systems that generate large numbers of log files. It allows automatic rotation, compres-sion, removal, and mailing of log files. Each log file may be handled daily, weekly, monthly, or when it grows too large. You can change zimbra log rotation timing by editing […]

How to change Zimbra log rotation timing


Log-rotate is designed to ease administration of systems that generate large numbers of log files. It allows automatic rotation, compression, removal, and mailing of log files. Each log file may be handled daily, weekly, monthly, or when it grows too large. cd /etc/logrotate.d/ Open service name file on which you […]

Change log rotation timing in Linux (RHEL-CENTOS-6/7)



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Since version 4.0, Samba can, additionally to a NT4 PDC, act as a Domain Controller that is compatible with Microsoft Active Directory. In the following, we explain how to set up Samba as an Active Directory Domain Controller from scratch. # Turn off SELINUX vi /etc/sysconfig/selinux SELINUX=disabled setenforce 0 # […]

How To Install and Configure Samba4 as an ...


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Squid Analysis Report Generator  is a Squid proxy log analysis tool for Linux. SARG provides web based logfile analysis and divides traffic based on IP address. Traffic is then categorized by web site visited, traffic volume, and other useful statistics. It enables you to see your Squid users internet usage. […]

Sarg report configuration with user interface.