• A database of your choice (MySQL, MariaDB, Postgresql)

  • MySQL 8 or newer requires Znuny 6.1 or newer

  • A webserver (Apache)

  • Some additional perl modules, depending on the distribution you are using

  • Disabled SELinux when using Red Hat Linux, CentOS, Rocky Linux, etc.


This manual is based on the assumption that you are installing on a fresh and empty system using MariaDB.


Some basic packages are needed to get going. This includes the web server, database (MariaDB in this case), cpanminus to install additional. Perl modules and tar to extract the source.

CentOS / Red Hat / Rocky Linux

dnf update -y
# Enable Powertools
dnf config-manager --set-enabled powertools
## CentOS / RHEL / Rocky Linux 9
dnf config-manager --enable crb
dnf install -y epel-release httpd cpanminus gcc dnf-plugins-core
# If you will use mariadb
dnf install -y mariadb mariadb-server

## Set selinux to Permissive
vi /etc/selinux/config

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
# See also:
# NOTE: In earlier Fedora kernel builds, SELINUX=disabled would also
# fully disable SELinux during boot. If you need a system with SELinux
# fully disabled instead of SELinux running with no policy loaded, you
# need to pass selinux=0 to the kernel command line. You can use grubby
# to persistently set the bootloader to boot with selinux=0:
#    grubby --update-kernel ALL --args selinux=0
# To revert back to SELinux enabled:
#    grubby --update-kernel ALL --remove-args selinux
# SELINUXTYPE= can take one of these three values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.


Ubuntu / Debian

apt update
apt install -y apache2 mariadb-client mariadb-server cpanminus

RPM Install#

Install the RPM via YUM

# Znuny LTS (modify version to latest see:
yum install -y

# Znuny 6.5
yum install -y

Install From Source#

The installation from the source takes some more steps:

# Download Znuny
cd /opt

# Extract
tar xfz znuny-latest-6.5.tar.gz

# Create a symlink
sudo ln -s /opt/znuny-6.5.8 /opt/otrs

# Add user for RHEL/CentOS
useradd -d /opt/otrs -c 'Znuny user' -g apache -s /bin/bash -M -N otrs

# Add user for Debian/Ubuntu
useradd -d /opt/otrs -c 'Znuny user' -g www-data -s /bin/bash -M -N otrs

# Copy Default Config
cp /opt/otrs/Kernel/ /opt/otrs/Kernel/

# Set permissions

# As otrs User - Rename default cronjobs
su - otrs
cd /opt/otrs/var/cron
for foo in *.dist; do cp $foo `basename $foo .dist`; done

Install Required Perl Modules#

Based on your distribution, there are several different was to install the needed modules.

To see which modules are missing but required, verify these with the following command.

~otrs/bin/ --all

CentOS / Red Hat / Rocky Linux

Some of the needed Perl Modules are installed, when installing the RPM. You just need to complete the missing ones.

yum install -y jq

yum install -y "perl(Moo)"  "perl(Text::CSV_XS)" "perl(YAML::XS)" "perl(ModPerl::Util)" "perl(Mail::IMAPClient)" "perl(JSON::XS)" "perl(Encode::HanExtra)" "perl(Crypt::Eksblowfish::Bcrypt)" "perl(Data::UUID)"

cpanm Jq JavaScript::Minifier::XS iCal::Parser Hash::Merge Crypt::JWT CSS::Minifier::XS Data::UUID Spreadsheet::XLSX Crypt::OpenSSL::X509

# Note to install the Crypt::OpenSSL::X509, you will need to install openssl-devel

# If you will use MySQL or MariaDB

Ubuntu / Debian

apt -y install apache2 mariadb-client mariadb-server cpanminus libapache2-mod-perl2 libdbd-mysql-perl libtimedate-perl libnet-dns-perl libnet-ldap-perl libio-socket-ssl-perl libpdf-api2-perl libsoap-lite-perl libtext-csv-xs-perl libjson-xs-perl libapache-dbi-perl libxml-libxml-perl libxml-libxslt-perl libyaml-perl libarchive-zip-perl libcrypt-eksblowfish-perl libencode-hanextra-perl libmail-imapclient-perl libtemplate-perl libdatetime-perl libmoo-perl bash-completion libyaml-libyaml-perl libjavascript-minifier-xs-perl libcss-minifier-xs-perl libauthen-sasl-perl libauthen-ntlm-perl libhash-merge-perl libical-parser-perl libspreadsheet-xlsx-perl libcrypt-jwt-perl libcrypt-openssl-x509-perl jq

cpanm install Jq

Database Configuration#

MySQL / Maria DB needs some config modifications. If you are using postgresql you can skip this step:

Create a new file for the mysql config:

CentOS / Red Hat


Ubuntu / Debian


innodb_log_file_size = 256M
character-set-server  = utf8
collation-server      = utf8_general_ci


The web installer requires a password. The networking “bind-address” should be localhost. By default,, a synonym for skip-networking, is set. Additionally, there is no information about the requirement for utf8 whereas the default is utf8mb4

If started, restart the MariaDB database to apply the changes otherwise enable and start the MariaDB.

systemctl restart mariadb
# or
systemctl enable --now mariadb

Run mysql_secure_installation

Webserver Configuration#

CentOS / Red Hat

The Apache config is already in place if you used the RPM install.

Enable MPM prefork module:

sed -i '/^LoadModule mpm_event_module modules\/^/#/' /etc/httpd/conf.modules.d/00-mpm.conf
sed -i '/^#LoadModule mpm_prefork_module modules\/^#//' /etc/httpd/conf.modules.d/00-mpm.conf


In case you did a source install on an RPM based system

To enable the Znuny Apache config you need to create a symlink to our sample config.

ln -s /opt/otrs/scripts/apache2-httpd.include.conf /etc/httpd/conf.d/zzz_znuny.conf

Ubuntu / Debian

To enable the Znuny Apache config you need to create a symlink to our sample config.

ln -s /opt/otrs/scripts/apache2-httpd.include.conf /etc/apache2/conf-available/zzz_znuny.conf

Enable the needed Apache modules:

a2enmod perl headers deflate filter cgi
a2dismod mpm_event
a2enmod mpm_prefork
a2enconf zzz_znuny
## RHEL / CentOS / Rocky Linux
systemctl restart httpd
# or
systemctl enable --now httpd
## Ubuntu / Debian
systemctl restart apache2
# or
systemctl enable --now apache2

CentOS / Red Hat

systemctl restart httpd

Ubuntu / Debian

systemctl restart apache2

You should be able to access the installer script using:


Start-up Configuration#

You should enable the web server and the database to get started on boot.

CentOS / Red Hat

systemctl enable mariadb httpd

Ubuntu / Debian

systemctl enable mariadb apache2

Enable Znuny Cron#

Switch to the otrs user:

su - otrs
bin/ start