To install Znuny or Znuny LTS you need:

  • 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

dnf install -y epel-release httpd mariadb mariadb-server cpanminus gcc dnf-plugins-core
yum config-manager --set-enabled powertools

Ubuntu / Debian

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

Install an RPM#

The installation via RPM

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

# Znuny 6.3
yum install -y

Install From Source#

The installation from the source takes some more steps:

# Download Znuny
cd /opt

# Extract
tar xfz znuny-latest-6.0.tar.gz

# Create a symlink
sudo ln -s /opt/znuny-6.0.38 /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.

CentOS / Red Hat

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

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)"

cpanm JavaScript::Minifier::XS CSS::Minifier::XS

yum remove -y gcc

Ubuntu / Debian

apt -y install 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

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


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

character-set-server = utf8 collation-server = utf8_general_ci

Restart the MariaDB database to apply the changes

systemctl start mariadb

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

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

Start / Restart the web server to apply the changes.

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