• Install LDAP client

apt-get install libnss-ldap

When prompted enter:

LDAP Version 3
Make local root Database admin? No
Does the LDAP database require login? No

• Edit /etc/ldap.conf

host IP1 IP2
#uri ldapi:///

• Set up nss and pam to use LDAP

auth-client-config -t nss -p lac_ldap
pam-auth-update