About: Kolab is a free and open-source groupware suite

Step1. Install the epel release

yum -y install epel-release

Step2. Set the hostname

vi /etc/hosts
IP_ADDRESS server83.example.com

Step3. Check the SELinux status

sestatus

Step4. Disable the SELinux

setenforce 0

Note: To completely disable SELinux, you will need to edit /etc/selinux/config file.
vi /etc/selinux/config
SELINUX=disabled

Step5. Reboot the machine

shutdown -r now

Step6. Allow ports on the firewall

firewall-cmd –permanent –add-service=http
firewall-cmd –permanent –add-service=https
firewall-cmd –permanent –add-service=pop3s
firewall-cmd –permanent –add-service=imaps
firewall-cmd –permanent –add-service=smtp
firewall-cmd –permanent –add-service=ldap
firewall-cmd –permanent –add-service=ldaps
firewall-cmd –permanent –add-port=110/tcp
firewall-cmd –permanent –add-port=143/tcp
firewall-cmd –permanent –add-port=587/tcp
firewall-cmd –reload

Step7. Download the Kolab repo

wget http://obs.kolabsys.com/repositories/Kolab:/16/CentOS_7/Kolab:16.repo -O /etc/yum.repos.d/Kolab:16.repo
rpm –import https://ssl.kolabsys.com/community.asc

Step8. Install the package

yum -y install yum-plugin-priorities

Step9. Modify the repo file

bash -c ‘for f in /etc/yum.repos.d/Kolab*.repo; do echo “priority = 60” >> $f; done’

Step10. Install the kolab package

yum -y install kolab

Step11. Configure the Kolab

setup-kolab

Note: The following questions will be asked during setup.

Administrator password: #’admin’
Directory Manager password [qhZlb2P9OYubDJv]: #Provide LDAP directory manger password
User [dirsrv]: #Press the enter
Group [dirsrv]: #Press the enter
rackvoucher.com [Y/n]: #Press the enter
dc=rackvoucher,dc=com [Y/n]: #Press the enter
Cyrus Administrator password [Awt7z1O2UTl-HZs]: #Press the enter
Kolab Service password [T_T4ut8pvE_G_Os]: #Press the enter
Choice: 2 #Press the enter
MySQL root password [E7FIj_MWGNEVXPF]: #Press the enter
MySQL kolab password [8MYG_Hveb4FPCW3]: #Press the enter
Timezone ID [UTC]: Asia/Kolkata #Press the enter
MySQL roundcube password [iz3gP7sqaBa6Vh6]: #Press the enter
NOTE: and here is my error in my case

NOTE: here is my error in my case end the stage, when error does resolve then complete the installation

Step12. Access via browser

http://ip_address/kolab-webadmin

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