How to automatically create user accounts ( SSH + LDAP )

I set up remote LDAP server (Server1) and SSH with pam_ldap on Server2. Everything is working ok, I can login to SSH with LDAP credentials. But when I want to add new user, I have to firstly create it in LDAP databases and then run adduser on Server2.

How can I automatically create the user account on Server2 after adding it to LDAP database ? For example when the user first logs in? Thanks.

You don't need to actually make the user on the server2, only their home directory on first login. You're looking for pam_mkhomedir:

http://www.linux-pam.org/Linux-PAM-html/sag-pam_mkhomedir.html

Google will find you many howtos and examples on getting this set up.

Have you enabled the LDAP module for NSS?

See here on how to do this: http://wiki.debian.org/LDAP/NSS