[systemd-devel] automount nested nfs share

[Jóhann B. Guðmundsson]

Open up a support case with Red Hat since that's what you are paying for.


On 05/04/2016 08:40 AM, Marco Giunta wrote:
> Hi at all,
> I've a problem with automount features of systemd. I need to mount two 
> nfs share in this way:
>
>
> /srv/nfs        nfs-server.example.com:/share1
> /srv/nfs/nested        nfs-server.example.com:/share2
>
>
> On my old RHEL6 workstation, I used autofs, but now, with a RHEL7 
> workstation, I'd like to use systemd.
>
> I've configure two mount units, and they work like a charm: the nfs 
> export are mounted like I guess. Then, I've configured an automount 
> unit for '/srv/nfs', and it works, BUT when I 've created an unit to 
> automount '/srv/nfs/nested', and started it, immediately '/srv/nfs' 
> has been mounted, and I cannot unmount it (device is busy).
>
> If I stop '/srv/nfs/nested' automount service, I can unmount 
> '/srv/nfs'. I'm trying to figure out the problem, and I think the 
> reason is 'automatic dependencies':
>
> """
> If an automount unit is beneath another mount unit in the file system 
> hierarchy, both a requirement and an ordering dependency between both 
> units are created automatically.
> """
>
> in fact:
>
> # systemctl list-dependencies srv-nfs-nested.automount
> srv-nfs-nested.automount
>   -.mount
>   srv-nfs.mount
>
>
> 'srv-nfs-nested.automount' depends on 'srv-nfs.mount'. I don't want 
> this, I want the 'srv-nfs-nested.automount' depends on 
> 'srv-nfs.automount', because I don't want to have '/srv/nfs' always 
> mounted, I need to mount it on request, I have more then 300 
> workstations to configure.
>
> I've tried to change these settings:
>
> DefaultDependencies = false
> Requires=srv-nfs.automount -.mount
>
> but it doesn't works, because 'DefaultDependencies' doesn't disable 
> all dependencies:
>
> '''
> If set to false, this option does not disable all implicit 
> dependencies, just non-essential ones.
> '''
>
> So, my question is: is there a way to disable implicit dependencies ?? 
> Or is there another way to automount nested nfs share with systemd ??
>
> With autofs, I used a configuration like this:
>
> /srv/nfs    -fstype=nfs4,rw \
>         /        nfs-server.example.com:/share1 \
>         /nested        nfs-server.example.com:/share2 \
>         /nested2    nfs-server.example.com:/share3
>
> and it works as I guess.
>
> Cheers,
>   Marco
>
>
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