[Beowulf] cluster authentication part II

[Jörg Saßmannshausen]

Hi Jonathan,

thanks for the link. That is basically what I was doing as there are many 
tutorials and how-to pages out there. Your page is quite nicely condensed 
which makes it easy to read. 

All the best

Jörg


Am Mittwoch, 17. Januar 2018, 16:36:57 GMT schrieben Sie:
> I don't want to bore anybody, this might be interesting. My parts are
> almost all in. This is a really great topic.
> https://arthurdejong.org/nss-pam-ldapd/setup
> And with several informative web page a.
> 
> On Jan 17, 2018 3:13 PM, "Jörg Saßmannshausen" <
> 
> sassy-work at sassy.formativ.net> wrote:
> > Dear all,
> > 
> > thanks for all your useful comments.
> > In the end, and after some debugging, I found the culprit. For one reason
> > or
> > another I installed libpam-ldap instead of libpam-ldapd. I guess that was
> > a
> > typo as libpam-ldapd will be pulled automatically when you are installing
> > nslcd.
> > Once I corrected that, both su -l USER and ssh USER at localhost (or from a
> > remote host to the Ubuntu VDI) are working fast again.
> > Don't ask me what is the difference between the two, I don't know is the
> > short
> > answer here.
> > 
> > One question: when I was doing some research on the internet, I came
> > across
> > nslcd and sssd. Which one is 'better'? I know that is a bit of an
> > ambiguous
> > question to ask but I have not found a page telling me the difference
> > between
> > the two.
> > 
> > Regarding Ubuntu vs. other distros: that is not my choice. Personally I am
> > in
> > favour of Debian but that is my personal choice. At the workplace I have
> > to
> > work with what is their policy. I am not a great fan of having different
> > distributions floating around at one place as it make the administration a
> > nightmare (you will be never good at all of them) but we are where we are
> > here.
> > 
> > Regarding sudo: that is still a problem on one of the servers: it simply
> > does
> > not accept the password. Once I know more here I can report back to you
> > John.
> > 
> > Sorry for my slow response here. I am not looking at the email list when I
> > am
> > at work and thus it takes me a day or two to reply.
> > 
> > All the best from a cold London (storm about to come tonight)
> > 
> > Jörg
> > 
> > Am Mittwoch, 17. Januar 2018, 12:08:37 GMT schrieben Sie:
> > > I would switch to sssd. I had many problems with nslcd (connection,
> > > cache...).
> > > 
> > > 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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