LDAP Client on Ubuntu

You will need to set up a number of applications on the client.
# apt-get install libpam-ldap libnss-ldap nss-updatedb libnss-db
This series of articles will help you understand the benefits of LDAP as well as implementation of LDAP.
LDAP Basics for Ubuntu
LDAP Server for Ubuntu
LDAP Client for Ubuntu 

Once the applications are installed you will need to supply a few answers. Set up the server IP for the LDAP server.
LDAP Ubuntu
Enter your domain information.
ldap Ubuntu
Be sure to correctly list your LDAP version, by default Ubuntu will install version 3.
LDAP Version on Ubuntu

Allow pam to act like you would for changing local passwords.
pam with LDAP
Allow LDAP database to be accessible without a password.
LDAP database
Create your administrator account.
Set up your LDAP admin password.

Configure Local Files

You will need to configure several local files for LDAP to work with password information.
Edit /etc/nsswitch.conf
Change the file so that files ldap replaces compat.
#passwd: compat
passwd: files ldap
#group: compat
group: files ldap
If this is working correctly when you use this command:
getent passwd
You should see similar /etc/passwd like output:
snort:x:112:124:Snort IDS:/var/log/snort:/bin/false

Edit /etc/pam.d/common-account
You will need to edit the file so you have these two lines.
account sufficient pam_ldap.so
account required pam_unix.so

Edit /etc/pam.d/common-auth
auth sufficient pam_ldap.so
auth required pam_unix.so nullok_secure use_first_pass

Edit /etc/pam.d/common-password
password sufficient pam_ldap.so
password required pam_unix.so nullok obscure min=4 max=8 md5

This should complete the client setup on Ubuntu 8.04.

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