Zimbra is a well known collaboration suite which includes email, calendaring, file sharing, activity streams, social communities and more. The most popular product from Zimbra is Zimbra Collaboration Server. Zimbra Collaboration Server comes with two version: Network Edition and Open Source Edition (FOSS). This documentation shows a simple way to install Zimbra Collaboration Server Open Source Edition in CentOS 6.5.

###Getting Started

Prepare the system

# yum update

Disable SELinux

Quantum Espresso is a software for electronic-structure calculations and materials modeling at the nanoscale. The installation of Quantum Espresso is quite easy because it includes external libraries which it needs. But we are encouraged to install Quantum Espresso using our own machine optimized external libraries such as Basic Linear Algebra Subprograms (BLAS), Linear Algebra Package (LAPACK), Scalable LAPACK (SCALAPACK), and Fastest Fourier Transform in the West (FFTW). ###External Libraries There are several repositories or development teams which provide external libraries. For example is Netlib which provides BLAS, LAPACK, and SCALAPACK. But, for machines with Intel processor, maybe the best external libraries out there is Intel® Math Kernel Library which has a non-commercial version as standalone or included in Intel® Parallel Studio XE 2013 for Linux that can be downloaded in Intel Non-Commercial Software Development. Intel® Math Kernel Library provides BLAS, LAPACK, SCALAPACK, and even FFTW interfaces. ###Getting Started My test machine is Supermicro X9DRD-7LN4F which has Intel(R) Xeon(R) CPU E5-2660 0 @ 2.20GHz with 8 cores and 16 threads and 64 GB RAM. For compilers I will be using Intel compilers which is included in Intel® Parallel Studio XE 2013 for Linux and OpenMPI for parallelization. ####Installing Intel® Parallel Studio XE 2013 for Linux

Icinga is a well-known server or network monitoring that runs in many Unix/Linux distribution. Server/Network monitoring is an essential part of Network Operations Center because by monitoring network engineers can always get the feedback and status from network and production servers. This is a simple documentation of Icinga installation in Scientific Linux 6.4 server. ###Getting started Before we install icinga, it best to keep our system updated.

# yum update

Search icinga package using yum search in RPMForge repository.

Cacti is a network graphic monitoring tools which used the potential of RRDTool. RRDTool is a data logging and graphing system for time series data. Cacti can show us a real time performance of network or servers which make this software become one of the most popular open source monitoring software. ###Getting Started Always update your box before we install new software.

# yum update

Install dependencies for cacti.

Hello, I want to share a documentation how to setup a mail server using CentOS 6.5 using Postfix as SMTP server and Dovecot as IMAP/POP3 server. Postfix is a well known Message Transfer Agent that mostly used today and Dovecot is also one of the widely used Mail User Agent. ###Preparing The Machine In this documentation we use a CentOS 6.5 server and before we start, let’s update the system.

# yum update

A mail server needs to have a MX record in its DNS, so make sure we have that. It is also a good thing to set the PTR record pointing to our domain too.

CentOS community now works together with Redhat alongside Fedora. It’s good news. So, we can hope to get a better software and support for next release of our beloved CentOS. As one of Linux (CentOS) fan, I want to share my experience installing nginx (engine-x) in CentOS 6.5. My VPS was installed as minimal server and then I added new packages, such as “Development tools” group and new repos (EPEL, CentALT).