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 Install and Configure TigerVNC Server on CentOS 7.1 / RHEL 7.1 / Oracle Linux 7

The following article explain how to Install and configure TigerVNC Server on CentOS 7.1 or Red Hat Enterprise Linux (RHEL 7.1) or Oracle Linux 7. TigerVNC (Tiger Virtual Network Computing) is a remote access utility that allows you to control other computers that running graphical desktop sharing in separate sessions in parallel. It is works…

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 Fix GNOME License Not Accepted Issue on CentOS 7

This post assume that you have just finished the Gnome GUI installation on CentOS 7 by using “yum groupinstall “GNOME Desktop” “Graphical Administration Tools” -y” command. Previously you are running a minimum CentOS 7, only with command line via terminal. But after you reboot the server you get the following screen. Initial setup of CentOS…

How to Install and Setup Apache Tomcat 8 on CentOS 7.1 / RHEL 7

Apache Tomcat version 8 is an open source web server and servlet container developed by the Apache Software Foundation (ASF) and provides a web server environment for Java based source code. Tomcat 8 is the first Apache Tomcat release to support the Servlet 3.1, JSP 2.3, EL 2.3, and WebSocket specifications. This post will cover…

How to Adjust the Zimbra Maximum Message and Upload Size via CLI

The following post shows how to check and adjust the Maximum Message Size and upload size for messages passing through the Zimbra MTA (Postfix). The default Postfix message_size_limit was 10MB (10240000 bytes) and the message_size_limit postconf parameter is configured globally for all zimbra MTAs. Q. How to Adjust the Zimbra Maximum Message and Upload Size…

How to Show Mailbox Size on Zimbra via Command Line

Q. How to show user mailbox size on zimbra via command line ? A. please issue the following command to show only the mailbox size on zimbra. 1. Display all users : $ zmprov gqu `zmhostname`|awk {‘print ” “$3″ “$2″ “$1′} Output : 384289 0 [email protected] 222445 0 [email protected] 25568 0 [email protected] 0 0 [email protected]

Nginx Released Version Nginx 1.8.x

Nginx is lightweight fast web server/reverse proxy and e-mail (IMAP/POP3) proxy. On 21 Apr 2015, nginx has release the stable branch version, 1.8.x which includes many new features from the 1.7.x mainline branch – including hash load balancing method, backend SSL certificate verification, experimental thread pools support, proxy_request_buffering and more. : Changes with nginx 1.8.0…

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