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 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 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 […]