[ale] After 15 years, Nohup is sttll broken???

[Raj Wurttemberg]

Why not just use screen or tmux?  Both allow you to reconnect to a
disconnected session. 

Thanks,
/Raj

-----Original Message-----
From: Ale <ale-bounces at ale.org> On Behalf Of Neal Rhodes via Ale
Sent: Wednesday, July 31, 2019 10:04 AM
To: ale at ale.org
Subject: [ale] After 15 years, Nohup is sttll broken???

So, about 15 years ago, when we were transitioning from SCO Unix to Linux,
we noticed that nohup didn't work on long running Progress Database jobs.

We would start an update job via nohup, leave, several hours later the ssh
session would timeout, and at some point the job would get a hangup signal
and die.  Which is sometimes really annoying if it's a 15 hour job.

Our workaround at the time was a script, "mynohup":

#!/bin/bash
set -x
echo "at `date` Starting: $* " >> mynohup.out echo "$*  >> mynohup.out " |
at now set +x

Which has worked flawlessly for 14.9 years.

Now we are transitioning to new servers, running
2.6.32-696.30.1.el6.x86_64 #1 SMP Tue May 22 03:28:18 UTC 2018 x86_64
x86_64 x86_64 GNU/Linux

inside VMs, and we experienced some awkwardness with some admin UI which had
Apache -> PHP -> sh -> sudo - adminuser -> mynohup something.  
Barfing up some messages about tty devices.   I thought of at least 
unwinding the old kluge.

So, I thought, surely this has been fixed now, and tried running a job via
nohup from an ssh session.

Sure enough, at some point after leaving the office, the DB log shows....

[2019/07/30 at 22:07:25.844-0500] P-28382  7: (562)   HANGUP signal 
received.
[2019/07/30 at 22:07:25.847-0500] P-28382  7: (453)   Logout by neal on 
/dev/pts/4.
[2019/07/30 at 22:07:28.241-0500] P-28439  8: (562)   HANGUP signal 
received.
[2019/07/30 at 22:07:28.241-0500] P-28439  8: (453)   Logout by tdiadmin on 
batch.

Wuh? The sole point of nohup is to not get a hangup, and ....????

regards,

Neal

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