How to Setup Installation of Kolab Groupware on CentOS 7.0

October 13, 2015 | By
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Kolab is a free, secure, scalable, reliable and open source groupware server with a web administration interface, management resources, synchronization for several devices and more. Different clients can have access to variety of it features that includes Kolab client for Mozilla, Outlook and KDE. The core features that can be availed using the Kolab groupware are Emails Solution, Calendering, Address Books and Task Management.

So, using the Kolab Groupware multiple functionality is provided for email server, spam and virus filtering and web interface that supports secure protocols such as imaps, https, smtps, https, etc. The web interface can be used to add, modify and remove users, domains, distributions list, shared folders, among other things.

1) System Preparation

Kolab installation process is very simple to follow, but we need to take care of few things before installing it on CentOS 7.0.

The base operating system we are using in this tutorial is CentOS-7.0 with minimal installation packages. Let's connect to your centos server with root user and configure your basic server settings by following few steps.

Network Setup

Configure your CentOS 7 server with the static IP address and a fully qualified domain name as it has strict DNS requirements for how this machine refers to itself, and how people will locate this machine.

You can check and setup your hostname using following commands respectively.

# hostname -f
# hostnamectl set-hostname cen-kolab
# vim /etc/hosts cen-kolab

Configure Firewall

If you are working on a critical environment then you must Enable SELinux and Firewalld on your CentOS 7 server, while its better if you could disable both in a test or non-production environment.

Acording to Kolab officials SELinux is not fully compatible with SELinux features so its quite recommended that you consider configuring SELinux to be permissive mode.

The SELinux can be checked and configured with below commands.

# sestatus
# setenforce 0

To enable and start firewall service in CentOS 7, run the following commands.

# systemctl enable firewalld
# systemctl start firewalld

In order to allow the required ports used by Kolab in CentOS-7 firewall, let's create a simple script with all required ports and services to be executed on the system.

# vim

for s in ssh http https pop3s imaps smtp ldap ldaps
firewall-cmd --permanent --add-service=$s
for p in 110/tcp 143/tcp 587/tcp
firewall-cmd --permanent --add-port=$p
firewall-cmd --reload

After saving changes execute this script and then run the below command to check if all the mentioned ports are allowed.

# iptables -L -n -v

Allowed Ports

2) Installing Kolab on CentOS 7

Now we will be installing Kolab by adding its latest EPEL repository for CentOS-7. Let's run the below command to install its latest EPEL repository.

Ading EPEL

# rpm -Uhv

Kolab EPEL

Downloading EPEL

Now run the below commands to download the newly added repositories on your centos 7 server.

# wget
# wget

To add its GPG key , use the following command.

# rpm --import

Download Kolab Repository

Installing Yum Plugin

To install yum plugin priorities package, run the below command.

# yum install yum-plugin-priorities

yum plugin priorities

To proceed the installation process "Y" to proceed with the installation package.

Package Arch Version Repository Size
yum-plugin-priorities noarch 1.1.31-29.el7 base 24 k

Transaction Summary
Install 1 Package

Total download size: 24 k
Installed size: 28 k
Is this ok [y/d/N]: y

Install Kolab Groupware

Finally we reached at the point to install kolab groupware, let's run the command to start its installation on centos 7 with yum.

# yum install kolab

installing kolab

This will install kolab groupware with a number of packages including its various dependencies. To proceed with press "Y" to continue if you agree to install these packages as shown below.

Transaction Summary
Install 1 Package (+341 Dependent packages)
Upgrade ( 7 Dependent packages)

Total download size: 198 M
Is this ok [y/d/N]: y

During the installation process you will be asked to confirm the GPG Key before the installation of packages starts. Press "Y" to accept the changes and let the installation complete.

import GPG Key

3) Starting Services

After kolab groupware installation start the Apache web server, MariaDB and Postfix services and enable them to auto start at each reboot using the following commands.

For Apache

#systemctl start httpd.service
#systemctl enable httpd.service

For MariaDB

#systemctl start mariadb.service
#systemctl enable mariadb.service

For Postfix

#systemctl start postfix.service
#systemctl enable postfix.service

4) Configuring Kolab Groupware

Now we will start the Kolab setup process by using the below command. So first thing it will ask to configure is the FQDN, then it will ask for the password to configure that will be used later on.

Let's run the following command to start Kolab setup as shown.

# setup-kolab

Kolab Setup

Configure the hostname accordingly. [Y/n]: n
Domain name to use:

The standard root dn we composed for you follows. Please confirm this is the root
dn you wish to use.

dc=cen-kolab,dc=linoxide,dc=com [Y/n]: Y

Setup is now going to set up the 389 Directory Server. This may take a little
while (during which period there is no output and no progress indication).

Once the Kolab setup is complete , it better to reboot your server as a good practice and make sure that all services are up and running.

5) Kolab Web Login

Now we can login to the web admin using the URL and the credentials that you had configured during it setup.

Let's open the Kolab web admin page as shown below.

Kolab Web Admin

After providing successful credentials you will be greeted with Kolab Web Administration page, where you can manage users, resource and other objects.

Kolab Server Maintenance


We have successfully installed and configured Kolab on CentOs 7, which is one of the best groupware solution. Its email and calendar services are completely secure, so your private data will never be crawled and get ready your own Kolab server. Do let us know if you find any difficulty.


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