[Freeipa-users] Synology DSM5 and freeIPA

Fri Apr 10 17:05:08 UTC 2015

Here's the link:

https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html/Linux_Domain_Identity_Authentication_and_Policy_Guide/users.html#home-directories

On Fri, Apr 10, 2015 at 12:42 PM, Dmitri Pal <dpal at redhat.com> wrote:

>  On 04/09/2015 07:44 PM, Prasun Gera wrote:
>
> I have a somewhat related question.  Without kerberizing NFS, which I'll
> do eventually since that needs all the clients to be migrated first, how
> does one create home directories automatically ? The IPA server and NFS
> server are different systems. I was able to verify that automatic home
> creation works if the NFS share is exported to the IPA server with
> no_root_squash. What's the proper way of doing this ?
>
>
> The documentation says:
>
>
> Which documentation you are referring to?
> Can you please post the link?
>
>
>
> Use a remote user who has limited permissions to create home directories
> and mount the share on the IdM server as that user. Since the IdM server
> runs as an httpd process, it is possible to use sudo or a similar program
> to grant limited access to the IdM server to create home directories on the
> NFS server.
>
>
>
> What would be the list of steps that would achieve this ? What are the
> limited permissions that the NFS user would need ? Read + Write, but no
> Delete to the /home directory ? Sounds like something that would need ACLs.
> And where does sudo on the IPA server fit into this ?
>
>
>
> On Thu, Mar 19, 2015 at 4:51 PM, Roberto Cornacchia <
> roberto.cornacchia at gmail.com> wrote:
>
>> Thanks, Jakub.
>>
>>
>> On 19 March 2015 at 21:23, Jakub Hrozek <jhrozek at redhat.com> wrote:
>>
>>>
>>> > On 19 Mar 2015, at 21:18, Roberto Cornacchia <
>>> roberto.cornacchia at gmail.com> wrote:
>>> >
>>> > It's possible that I'm simply not getting the point, or that I don't
>>> understand the documentation correctly, but this is what I don't find clear:
>>> >
>>> > I had seen the instructions you pointed me at. These are not
>>> specifically about home directories.
>>> >
>>> > However, this section is:
>>> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Linux_Domain_Identity_Authentication_and_Policy_Guide/index.html#homedir-reqs
>>> >
>>> > It first suggests that automatic creation of home directories over NFS
>>> shares is possible: just automount /home and then use pam_oddjob_mkhomedir
>>> or pam_mkhomedir to create homedirs at first login.
>>> >
>>> > But then it also suggests that mounting the whole /home tree could be
>>> an issue, and says: "Use automount to mount only the user's home directory
>>> and only when the user logs in, rather than loading the entire /home tree."
>>> >
>>> > That means that automatic homedir creation is out of the game, doesn't
>>> it?
>>> >
>>> > That's what I find confusing. What's the recommended way?
>>> >
>>>
>>> It really depends on your environment. For your size, it's perfectly
>>> fine to NFS mount the whole /home tree and be done with it. Don't optimize
>>> prematurely :-)
>>>
>>> >
>>> >
>>> > On 19 March 2015 at 20:49, Dmitri Pal <dpal at redhat.com> wrote:
>>> > On 03/19/2015 02:46 PM, Roberto Cornacchia wrote:
>>> >> Hi Dmitri,
>>> >>
>>> >> I do realise my question is borderline and I accept that it is
>>> considered off-topic.
>>> >>
>>> >> I did post it here because I believe it's not *only* about NFS, but
>>> also about its interaction with freeIPA. The issue of NFS home and in
>>> particular about their creation is touched in all the links I posted (all
>>> about freeIPA) and never really answered.
>>> >>
>>> >
>>> > This is what documented and recommended:
>>> >
>>> https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/7/html-single/Linux_Domain_Identity_Authentication_and_Policy_Guide/index.html#kerb-nfs
>>> >
>>> > RHEL6 has a similar chapter in its doc set though books have changed
>>> significantly between 6 and 7.
>>> >
>>> > I do not see any chicken and egg problem there.
>>> > The instructions show how to create home dirs on the first login.
>>> >
>>> > It mounts the volume and then creates dirs on it as users log in if
>>> they are not already there.
>>> >
>>> > It is unclear what problem you see with doing it the way it is
>>> recommended.
>>> >
>>> >
>>> >
>>> >> Best,
>>> >> Roberto
>>> >>
>>> >> On 19 March 2015 at 19:36, Dmitri Pal <dpal at redhat.com> wrote:
>>> >> On 03/19/2015 05:29 AM, Roberto Cornacchia wrote:
>>> >>> On 6 March 2015 at 11:15, Martin Kosek <mkosek at redhat.com> wrote:
>>> >>> On 03/06/2015 10:56 AM, Roberto Cornacchia wrote:
>>> >>> Hi there,
>>> >>>
>>> >>> I'm planning to deploy freeIPA on our lan.
>>> >>> It's small-ish and completely based on FC21, so I expect everything
>>> to work
>>> >>> like a charm.
>>> >>>
>>> >>> Except one detail. We have Synology NAS station, which uses DSM 5.0.
>>> >>> The ideal plan is to use it as host for shared NFS home dirs once we
>>> switch our
>>> >>> desktops to freeIPA.
>>> >>>
>>> >>> Great!
>>> >>>
>>> >>>
>>> >>> Hello,
>>> >>>
>>> >>> The first thing I'm struggling  with is to find the correct approach
>>> about NFS home dirs.
>>> >>> The ideal setting would be:
>>> >>> - home dirs on the NAS
>>> >>> - IPA manages automount maps
>>> >>> - home dirs are created automatically at first login
>>> >>>
>>> >>> The documentation I could find on these topics includes only
>>> not-so-recent pages (anything I missed?):
>>> >>>
>>> >>> http://wiki.linux-nfs.org/wiki/index.php/NFS_and_FreeIPA
>>> >>>
>>> http://docs.fedoraproject.org/en-US/Fedora/18/html/FreeIPA_Guide/automount.html
>>> >>>
>>> http://docs.fedoraproject.org/en-US/Fedora/18/html/FreeIPA_Guide/users.html#home-directories
>>> >>>
>>> http://adam.younglogic.com/2011/06/automount-and-home-directory-creation/
>>> >>>
>>> >>> Now, I admit I don't have much experience with setting up NFS homes,
>>> with or without freeIPA, so trying to get this done correctly in the
>>> context of freeIPA and without clear howtos isn't very easy, but I'm
>>> willing to get my hands dirty.
>>> >>>
>>> >>> The first problem I struggle with is on the correct approach.
>>> >>> From the documentation above, I understand that there is a bit of a
>>> chicken-egg problem about the creation of home dirs.
>>> >>> On the one hand, it would be optimal to have automount maps to load
>>> only single home dirs on demand, rather than the entire /home tree.
>>> >>> On the other hand, if the /home tree is not available, then creating
>>> /home/user1 dir automatically isn't really possible.
>>> >>>
>>> >>> Just mounting the whole /home tree would make things easier, but I
>>> don't have a feeling of when it starts to become a performance issue
>>> (assuming recent hardware and up to date software). 10 users? 50? 100? 500?
>>> No idea.
>>> >>> The realm I'm dealing with at the moment is in the range of 5-10
>>> users and probably won't be larger than 50 in the next few years (and if it
>>> will, it means things are going well, so what the heck ;)
>>> >>> Also true that, with such few users, I could just create the
>>> homedirs manually when needed (this is not an organisation where many users
>>> come and go) and just mount the individually.
>>> >>> Any tips about this?
>>> >>>
>>> >>> Best, Roberto
>>> >>>
>>> >>>
>>> >>>
>>> >>>
>>> >> Some of these questions are really outside the scope of this list.
>>> >> You might consider asking them on the NFS list.
>>> >>
>>> >> --
>>> >> Thank you,
>>> >> Dmitri Pal
>>> >>
>>> >> Sr. Engineering Manager IdM portfolio
>>> >> Red Hat, Inc.
>>> >>
>>> >>
>>> >> --
>>> >> Manage your subscription for the Freeipa-users mailing list:
>>> >> https://www.redhat.com/mailman/listinfo/freeipa-users
>>> >> Go to http://freeipa.org for more info on the project
>>> >>
>>> >>
>>> >>
>>> >
>>> >
>>> > --
>>> > Thank you,
>>> > Dmitri Pal
>>> >
>>> > Sr. Engineering Manager IdM portfolio
>>> > Red Hat, Inc.
>>> >
>>> >
>>> > --
>>> > Manage your subscription for the Freeipa-users mailing list:
>>> > https://www.redhat.com/mailman/listinfo/freeipa-users
>>> > Go to http://freeipa.org for more info on the project
>>> >
>>> > --
>>> > Manage your subscription for the Freeipa-users mailing list:
>>> > https://www.redhat.com/mailman/listinfo/freeipa-users
>>> > Go to http://freeipa.org for more info on the project
>>>
>>>
>>
>> --
>> Manage your subscription for the Freeipa-users mailing list:
>> https://www.redhat.com/mailman/listinfo/freeipa-users
>> Go to http://freeipa.org for more info on the project
>>
>
>
>
>
>
> --
> Thank you,
> Dmitri Pal
>
> Sr. Engineering Manager IdM portfolio
> Red Hat, Inc.
>
>
> --
> Manage your subscription for the Freeipa-users mailing list:
> https://www.redhat.com/mailman/listinfo/freeipa-users
> Go to http://freeipa.org for more info on the project
>
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