Zimbra Domain Admin Delegation Open Source version 8.x and up

We were assigned a task of creating user account with access to only certain things. This can be done with this simple approach on Zimbra Open Source addition. 1. First create user admin_usr@domain.com for domain for which you want to grant delegation admin access. 2. We create admin_deleg.sh script in /opt/zimbra directory. The script should…

Deploy AWStats on CentOS 7 to report SMTP traffic

Let’s look at deploying AWStats on CentOS 7 Mail gateway running postfix and MailScanner 1. First lets install httpd if not yet installed yum install httpd 2. In order to install AWStats we will need to install and add EPEL repository yum install epel-release 3. Now we can install AWStats yum install awstats AWStats Configuration…

Manage Time service on RH and CentOS 7

When Linux system first boots the hardware clock is read first. The time on the hardware clock read from local hardware clock in UTC – Universal Time. Local time is the actual time in the current time zone. System time, unlike Hardware clock maintained by operating system. System clock is completely independent of the hardware…

Deploy LAMP on CentOS7

Many open source p[projects require LAMP with database and database user ready to go. Here we will look at basic commands on CentOS7 to get it up and running quickly.

Using TLS Encription with Postfix CentOS 6

This tutorial based on CentOS 6.4 Linux Asymmetric encryption uses key pair public and private. With asymmetric encryption we use digital certificates to discover other people public keys. Certificate stores information like Organization name , users email address , department and so on. Before encrypted communication starts one of the party’s sends public certificate to…

Protect CentOS Linux system with SELinux

In many cases users simply turn off SELinux due to lack of understanding of this great security feature provided with every RedHat , CentOS , Fedora and some other Linux distributions. Another popular alternative, available on Novell’s SuSE Linux and Canonical’s Ubuntu platform, is called AppArmor. In this article we will take closer look at…

Install Nagios NRPE from source code on CentOS or Debian

In order to monitor internal resources of remote systems with Nagios you will need NRPE installed and configured on a client. There will be two pieces to install NRPE daemon and nrpe plugins. This particular install was tested with CentOS and Debian.

Basic NTP Configuration on CentOS 6

It is very important to have proper time set on your VPS system. There are many reasons for this. One of them is security, all log entries must have proper time stamp for successful troubleshooting, also some networking applications will not work properly with time not set properly. On Linux time synchronization is done with…