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LDAP + PAM + NSS with groups local and in LDAP

I am using LDAP + PAM + NSS on Linux, and am trying to use groups
defined locally as well as in LDAP.  These groups are for (critical)
apps that run on the Linux systems.  I want to define the group locally
as to not have issues when and if LDAP is unavailable.  But to manage
group members, I want to define the same groups (and gids) in LDAP.  

The problem is that the group members cannot 'newgrp' to groups in which
they are members (LDAP defined) if the groups exists locally.

It appears that when the group is defined locally, the server does not
check LDAP for group members. In the following example, user 'tester' is
a member of groups 'postgres' and 'testgrp' (defined in LDAP), and the
group 'testgrp' is also defined locally:

[tester]$ groups
postgres testgrp 

[tester]$ grep testgrp /etc/group
[tester]$ getent group testgrp

[tester]$ grep postgres /etc/group 
[tester]$ grep postgres /etc/gshadow
[tester]$ getent group postgres

As you can see, 'getent group' shows 'tester' is NOT a member of
postgres, although 'groups' shows he is.

My /etc/nsswitch.conf has:

passwd:    files ldap
shadow:    files ldap
group:     files ldap

PAM /etc/pam.d/system-auth has:

# testing for groups local and in ldap - 022809
auth        required      /lib/security/$ISA/pam_group.so debug
auth        required      /lib/security/$ISA/pam_env.so
auth        sufficient    /lib/security/$ISA/pam_unix.so likeauth nullok
auth        sufficient    /lib/security/$ISA/pam_ldap.so use_first_pass
auth        required      /lib/security/$ISA/pam_deny.so

And, in LDAP:

[tester]$ ldapsearch -x -b 'ou=groups,o=partner_x,dc=example,dc=net'
# extended LDIF
# LDAPv3
# base <ou=groups,o=partner_x,dc= example,dc=net> with scope subtree
# filter: cn=postgres
# requesting: ALL

# postgres, groups, partner_x, example.net
dn: cn=postgres,ou=groups,o=partner_x,dc=example,dc=net
objectClass: top
objectClass: posixGroup
cn:: cG9zdGdyZXMg
gidNumber: 110
memberUid: tester
description: Postgres DB Group

Thanks in advance for any help.


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