Hi,

based on this below instruction I installed the Zabbix server and Zabbix web on my CentOS server.
https://www.zabbix.com/documentation/current/manual/installation/install_from_packages/rhel_centos

The commands are:
rpm -Uvh https://repo.zabbix.com/zabbix/4.4/rhel/7/x86_64/zabbix-release-4.4-1.el7.noarch.rpm
yum-config-manager --enable rhel-7-server-optional-rpms
yum install zabbix-server-pgsql
yum install zabbix-web-pgsql
sudo -u postgres createuser --pwprompt zabbix

The last command was failed, because:
sudo: unknown user: postgres
sudo: unable to initialize policy plugin

The /usr/pgsql* folder also doesn't exists, so I cannot run pgsql command.

What would be the problem?

Thank you!