How to Change RunLevel on CentOS 7 / RHEL 7

Old method to change the runlevel via /etc/inittab in Redhat Enterprise Linux version and CentOS server has become obsolete on RHEL 7 and CentOS 7. This latest Linux operating system uses systemd system management daemon and relies on systemctl command in order to change the runlevel. RunLevel is set with linking to /etc/systemd/system/default.target. Please make […]

How to Install JAVA 8 (JDK 8u45) on CentOS 6 / CentOS 7

The JDK is a development tool for building applications, applets, and components using the Java programming language . It includes a useful tool for developing and testing programs written in the Java programming language and runs on the Java platform. You can go through this document to know more about new enhancement of Java JDK […]

How To Get Email Alerts for SSH Login on Linux Server

Enable SSH server on a virtual private server (VPS) will expose the server to the internet and provide opportunities for hacking activities, especially when VPS still using root as a primary access. VPS should be configured with a email alert automatically to each successful login attempts via SSH server . VPS server owner shall be […]

How to Disable Autostart for a Service at boot on Linux CentOS 7 / RHEL 7

Question : Due to some reason, I had to stop a service on linux CentOS 7. But when i restarted the server, the service starts again automatically. How to stop or disabled auto start services at boot ? Answer : Just issue the following command to disabled auto start for particular service. Syntax : sudo […]

How to Setup Zimbra Collaboration Suite 8.0.8 on CentOS 7.0

Zimbra Collaboration Suite (ZCS) is a groupware product created by Zimbra, Inc. Zimbra Collaboration Open Source Edition version 8.0.8 is available for us to test, evaluate, deploy, customize and improve. I have prepared the steps to install and configure Zimbra Collaboration Suite 8.0.8 on CentOS 7.0. There are new features and enhancements available in the […]

What are the Differences Between the Open-VM-Tools package and VMware Tools package

Question. Many of the system administrator asked whether they need to install Open-VM-Tools package or VMware Tools package that ships with ESX/ESXi VMware products. Answer. VMware Tools is a suite of utilities that enhances the performance of the virtual machine’s guest operating system and improves management of the virtual machine. –How to Install Vmware-tools for […]

How to Change Hostname on CentOS 7.0/RHEL 7.0

Q. I have CentOS 7.0 virtual private server, but the default hostname still localhost.localdomain. How do i change the hostname to my prefer hostname or FQDN ? [root@localhost ~]# hostname localhost.localdomain A. There are four(4) method to change the hostname on CentOS 7.0/RHEL 7.0. Method 1 1. Login to your VPS as a root. 2. […]

How to Configure Static IP Address on RHEL 7.0/CentOS 7.0/Oracle Linux 7

This article will describe the procedure to configure static Ip address on RHEL 7/CentOS 7/Oracle Linux 7 minimal installation. Network interface configuration files control the software interfaces for individual network devices. As the system boots, it uses these files to determine what interfaces to bring up and how to configure them. These files are usually […]

How to Install ifconfig and netstat on RHEL 7.0/CentOS 7.0/Oracle Linux 7

Question : I have just setup on RHEL 7.0/CentOS 7.0/Oracle Linux 7 minimal server installation but i notice ifconfig and netstat command not found. How to make those command available ? Solution : By default, ifconfig and netstat utility is not installed on RHEL 7.0/CentOS 7.0/Oracle Linux 7 minimal server installation. You need to install […]

How to Disable SELinux on RHEL 7/CentOS 7/Oracle Linux 7

Security-Enhanced Linux (SELinux) is an implementation of security policies for operating systems that provides a mechanism to support and help control access in the linux kernel. On Red Hat Enterprise Linux 7 (RHEL 7), CentOS 7 and Oracle Linux 7 (OL7), SELinux services were installed by default. The following tutorial will show you the basic […]

How to Check Swap Space/Memory/Size on Linux VPS Server

Linux uses swap space as a back up to its physical memory with an overflow area. Swapping is necessary for two important reasons. First, when the system requires more memory than is physically available, the swap space will gives memory to the current application (process) that needs the memory immediately. Second, a significant number of […]

How to Mount CDROM Media on CentOS 5/CentOS 6/CentOS 7

Question : How to mount CDROM/DVDROM media on linux CentOS server ? Solution : In certain situations, system administrators will need to mount cdrom containing the installer or data on linux CentOS or RHEL. Once cdrom mounted, they can access the data in the media discs directly. For reference, here is the easy way to […]

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