Zammad-installation on a fresh CentOS8-server

Your starting point for the open-source-variant is https://zammad.org

These are the direct installation manual links to the used dependencies:
– PostgresSQL for CentOS: https://www.postgresql.org/download/linux/redhat/
– Ngingx for CentOS: https://nginx.org/en/linux_packages.html#RHEL-CentOS
– Elasticsearch for CentOS: https://www.elastic.co/guide/en/elasticsearch/reference/7.14/rpm.html

source
centos 8