How to Reset Forgotten Root Password on Linux RHEL 7/CentOS 7

This article will explain the steps to reset a lost root password or to reset forgotten root password on Linux RHEL 7 or CentOS 7. Basically, the steps will adding a “rd.break” to the end of the line with kernel parameters in Grub to stops the start up process before the regular root filesystem is […]

How to a Add and Remove User Account on RHEL 6/7, CentOS 6/7, Oracle Linux 6/7

This article will explain and share how to add and remove user account with useradd(add) and userdel (remove) from the command-line on linux RHEL 6/7, CentOS 6/7, Oracle Linux 6/7 server. 1. Adding a New User to an Linux System. a) Get the useradd manual : # man useradd useradd – create a new user or […]

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 EPEL Yum Repository on Linux CentOS 7 / RHEL 7

Epel yum repository is an open source centos yum repository or rpm repository for developers and system administrators to perform the installation of RPM packages via yum on their virtual private server (VPS) or dedicated server. EPEL yum repository is redhat yum repository for CentOS and additional yum repository for the existing CentOS repository. It […]

How to Remove / Uninstall Nginx on CentOS 7 / RHEL 7 / Oracle Linux 7

Nginx web server is alternative web server to Apache and Lighttpd. Nginx popularity now growing because it focuses on high concurrency, high performance while maintaining low memory usage. However, due to certain reasons webmaster or system administrator can not use Nginx on their server and decide to uninstall Nginx. Most of the webmaster, administrator and […]

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 usually the hackers will try to brute force your root password and potentially get access to your server. Instead of using the default root account, […]

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 Linux Logical Volume Manager(LVM), version 2 (or LVM 2). LVM is a widely-used technique and extremely flexible disk management scheme for deploying logical rather than […]

Rescan SCSI Bus to Add or Remove a SCSI Devices on Linux

When you need to add a hard disk or network interface cards on the new VMware virtual machine on the production server, but you are not allowed to shutdown the server or you have several related issues as below. The following quick article shows how to rescan SCSI Bus to add or remove a SCSI […]

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 devices are connected needs to be rescanned to make the new hardware visible. As a system administrator, to maintain the linux server uptime is very […]

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 internet access to and from the Zimbra server, install the latest patches on the server zimbra 8, properly configure iptables filter or firewalld service, turn […]

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, better organization of shared folders for web client and the calendar now can run search on description for location or resources. You can get detailed […]

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