How to Reset the Directory Manager Password on RHEL 7 / CentOS 7
In the digital world, it’s a common practice to remember passwords. However, due to the sheer number of passwords we need to remember, it’s not uncommon to forget one or…
How to Reset Forgotten Root Password on Linux RHEL 7 / CentOS 7
This short howto will explain the steps to reset a lost root password or to reset a forgotten root password on Linux RHEL 7 or CentOS 7. Basically, we will…
How to Change RunLevel on CentOS 7 / RHEL 7
In Linux operating systems, specifically Redhat Enterprise Linux (RHEL) and CentOS, the method to change the runlevel via /etc/inittab has become obsolete as of RHEL 7 and CentOS 7. These…
How to Remove / Uninstall Nginx on CentOS 7 / RHEL 7 / Oracle Linux 7
Nginx is a popular web server and reverse proxy server, known for its high performance and low resource consumption. However, if you have decided to switch to another web server…
How to Grant a New User to Root Privileges on CentOS 6 / CentOS 7
One recommended way to manage virtual private server (VPS) or a dedicated linux server is not using the root account as the main access for SSH login. This is because…
How to Create LVM in Linux CentOS 7 / RHEL 7 / Oracle Linux 7
Storage technology plays a important role in improving the availability, performance, and ability to manage Linux servers. One of the most useful and helpful technology to linux system administrator is…
Rescan SCSI Bus to Add or Remove a SCSI Devices on Linux
Introduction The SCSI (Small Computer System Interface) is a protocol used to communicate with storage devices such as hard drives, tape drives, and CD/DVD drives. SCSI is used in many…
How to Add a New Hard Disk Without Rebooting on CentOS 7/ RHEL 7
Normally when you have added new storage to a running Virtual machine, you probably won’t see the new storage automatically. This is because the SCSI bus to which the storage…
How to Prepare for Zimbra 8 Installation Prerequisites on RHEL 7/CentOS 7
Before we install Zimbra 8, I would recommend you to meet all of these requirements. Some software prerequisites should be installed first, then setup the DNS and MX records, provides…
How to Install Zimbra 8.6.0 on RHEL 7/CentOS 7
Zimbra 8.6.0 brings new features, improvements in Mail server and better web clients experience. Some that caught my attention was local lmtp client can communicate over ssl for mail server,…
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…
3 Command to Change the Linux Date and Time in CentOS 7/RHEL 7
Red Hat Enterprise Linux 7 or CentOS 7 come with three default utilities or command line that help to configure and display the information about the system date and time:…