[ale] Lab Workstation Mystery

[Todor Fassl]

I am kind of regretting letting my end-users goad me into trying sts. We 
run sts because too many people complain about there being 2 years 
between updates.  What we really need is a distro that is 6 months 
behind everyone  else but does updates every 6 months.

On the other hand, I doubt that 16.04 will fix this bug/feature.  If we 
were still running lts, we'd probably have the same problem when we 
upgraded.







On 04/20/2016 02:32 PM, DJ-Pfulio wrote:
> Stuff like this is a reason why running non-LTS isn't recommended, unless
> absolutely required due to new hardware that hasn't been backported yet. There
> are other reasons NOT to touch non-LTS releases.
>
> "New" != Better
>
> BTW, Ubuntu 16.04 LTS release is TOMORROW.  I'll be waiting a few months before
> deployment (maybe 2 more yrs), but will start playing with the server version
> Friday. I don't touch desktop releases from Canonical anymore.  All the hassles
> just aren't worth the effort.
>
> IMHO, systemd still needs a few more years of painful use by others before it
> will be ready enough for my needs.  14.04 barely has any systemd, but some
> power-related settings are controlled by it.
>
> Of course, I'm not everyone else. Many thanks to folks chasing "new" - I did my
> time in the 1990s doing that.
>
> On 04/20/2016 02:00 PM, Todor Fassl wrote:
>> I verified that if you log in and then just log back out immediately, those same
>> 4 processes remain running, systemd, sd-pam, ibus-daemon, and ibus-dconf. I
>> don't have a plain ubuntu 15.10 system handy but I'll bet it does the same
>> thing. Anybody have a machine like that? Login at the console, log out, ssh to
>> the machine as another user, and see if there are any processes still running
>> for the user who just logged out.
>>
>> I tried switchng a machine to use gdm instead of lightdm, no joy.  I think I'm
>> logging in via gnome. I can try unity too.
>>
>> I think it's a systemd issue. In fact, I think it's a "feature" of systemd. It
>> messes up autofs though.
>>
>>
>>
>>
>>
>> On 04/20/2016 12:31 PM, Jim Kinney wrote:
>>> Anyone using screen, tmux or nohup?
>>> On Wed, 2016-04-20 at 11:52 -0500, Todor Fassl wrote:
>>>> I posted about this problem a couple of weeks ago and still have not
>>>> figured it out. The problem is that on a group of machines running
>>>> ubuntu 15.10, after a period of time, mounting home directories via
>>>> NFS
>>>> hangs. Attempting to mount or unmount home directories via NFS
>>>> simply
>>>> hangs. Eventually, the root filesystem getsremounted read-only and
>>>> the
>>>> machine becomes unusable even as a local user. One thing I've
>>>> discovered
>>>> since my first post about this is that when end-users log out, some
>>>> processes do not get killed off. The automounter can't umount the
>>>> home
>>>> directory because the user still has some processes running.
>>>> Eventually,
>>>> the machine has several home directories mounted via NFS for users
>>>> who
>>>> are no longer logged in. I am thinking that what is happening is
>>>> that
>>>> eventually this causes NFS to get wedged which in turn leads to the
>>>> kernel freaking out. Or something. Here is an example of the output
>>>> from
>>>> listing the processes for a user who has logged out:
>>>>
>>>> # ps -u enduser1
>>>>        PID TTY          TIME CMD
>>>>     101794 ?        00:00:00 systemd
>>>>     101795 ?        00:00:00 (sd-pam)
>>>>     103049 ?        00:00:00 ibus-daemon
>>>>     103057 ?        00:00:00 ibus-dconf
>>>>
>>>>
>>>> So frequently, even though a user has logged out days ago, the
>>>> systemd
>>>> and ibus-deamon might still be running. I am thinking after enough
>>>> time,
>>>> these things mess up the nfsv4 kernel module which eventually messes
>>>> up
>>>> the kernel itself.
>>>>
>>>> But why would logging out *not* killoff all of an end-user's
>>>> processes?
>>>>
>>>>
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>
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-- 
Todd