[Beowulf] cluster authentication part II

Rémy Dernat remy.dernat at umontpellier.fr
Wed Jan 17 03:08:37 PST 2018

I would switch to sssd. I had many problems with nslcd (connection, 

Best regards

On 16/01/2018 00:35, Jörg Saßmannshausen wrote:
> Dear all,
> reading the Cluster Authentication (LDAP,AD) thread which was posted at the
> end of last year reminds me of a problem we are having.
> For our Ubuntu 14 virtual machines we are authenticating against AD and I am
> using the nslcd daemon to do that.
> This is working very well in a shell, i.e. when I am doing this in a shell:
> $ su -l USER
> It is fast, it is creating the home directory if I need it (or not if I want
> to mount the file space elsewhere and use a local home) and the standard lookup
> tools like
> $ getent password USER
> are fast as well.
> However, and here is where I am stuck: when I want to log in to the machine
> using the GUI, this takes forever. We measures it and it takes up to 90 sec.
> until it finally works. I also noticed that it is not reading the
> /etc/nslcd.conf file but either /etc/ldap.conf or /etc/ldap/ldap.conf. The
> content of the ldap.conf file is identical with the nslcd.conf file. I am using
> TLS and not SSL for the secure connection .
> Furthermore, and here I am not sure whether it is the same problem or a
> different one, if I want to ssh into the Ubuntu VM, this also take a very long
> time (90 sec) until I can do that.
> Strangely enough, our HPC cluster is using nslcd as well (I used that
> nslcd.conf file as a template for the Ubuntu setup), authenticating against the
> same AD and that works instantaneous.
> Does anybody has some ideas of where to look at? It somehow puzzles me.
> I am a bit inclined to say the problem is within Ubuntu 14 as the cluster is
> running CentOS and my Debian chroot environment ist Stretch.
> All the best from London
> Jörg
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