Ldap 系统启动slapd失败且超时

我试图在Centos 7环境中使用puppet代理安装openldap（v2.4.44）——测试，收到了这个错误

Error: Systems start for slapd failed!
journalctl log for slapd:
systemd[1]: Starting OpenLDAP Server Daemon...
runuser[110317]: pam_unix(runuser:session): session opened for user ldap by 
(uid=0)
runuser[110317]: pam_unix(runuser:session): session closed for user ldap
tlsmc_get_pin: INFO: Please note the extracted key file will not be protected 
with a PIN any more, however it will be still protected at least by file 
permissions.
tlsmc_get_pin: INFO: Please note the extracted key file will not be protected 
with a PIN any more, however it will be still protected at least by file 
permissions.
tlsmc_get_pin: INFO: Please note the extracted key file will not be protected 
with a PIN any more, however it will be still protected at least by file 
permissions.
... loop until timeout

注意：如果我也手动安装，则会发生这种情况

也可能是环境问题，因为我在不同的环境中试过，看起来不错

有人有线索吗