DO NOT USE
not complete in any way
apt-get install slapd ldap-utils
https://www.linuxjournal.com/article/5505
https://www.openldap.org/doc/admin24/replication.html
https://linoxide.com/linux-how-to/install-openldap-2-different-hosts-configure-mirror-mode/
https://ypbind.de/maus/ldap_ha_loadbalancing.html
https://www.openldap.org/doc/admin24/replication.html#N-Way%20Multi-Provider%20Replication
https://mishikal.wordpress.com/2019/04/23/configuring-mmr-using-delta-syncrepl-in-openldap-updating-an-existing-standalone-configuration/