sudo rm -rf /usr/lib/systemd/system/slapd.service
sudo cat > /usr/lib/systemd/system/slapd.service <<EOF
[Unit]
Description=OpenLDAP Server Daemon
After=syslog.target network-online.target
Documentation=man:slapd
Documentation=man:slapd-config
Documentation=man:slapd-hdb
Documentation=man:slapd-mdb
Documentation=file:///usr/share/doc/openldap-servers/guide.html

[Service]
Type=forking
Environment="SLAPD_URLS=ldap:/// ldapi:///" "SLAPD_OPTIONS="
EnvironmentFile=/etc/sysconfig/slapd
ExecStartPre=/usr/libexec/openldap/check-config.sh
ExecStart=/usr/sbin/slapd -u ldap -h \${SLAPD_URLS} \$SLAPD_OPTIONS

[Install]
WantedBy=multi-user.target
Alias=openldap.service
EOF

sudo systemctl daemon-reload
sudo systemctl restart slapd