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Operating Systems Linux Red Hat Nohup with ampersand & process gets disconnected Post 303033343 by gandolf989 on Wednesday 3rd of April 2019 04:24:42 PM
Old 04-03-2019
Nohup with ampersand & process gets disconnected

For years I have spawned shell scripts with nohup and ampersand and they run whether or not I stay logged in. Recently a client told us that we had to set a keep alive timeout on all of our Redhat 7.6 Linux servers. Our sysadmin set the following parameters in the sshd_config file on all of our Redhat 7.6 servers:

Code:
ClientAliveInterval 900
ClientAliveCountMax 0

Now when I try to nohup an Oracle database clone script or some other type of Oracle database shell script, the script tends to die within 15 minutes. If I run the script through crontab it works fine. I have tried running tests where I use disown after spawning a script with nohup and ampersand, but that doesn't seem to help. Since the scripts are using sqlplus, and that is spawning its own process, my assumption is that the parent process is idle, even though the child process is not idle. Hence, the script dies.

I would use crontab, but then I need to remember to take the job out of crontab, otherwise it will continue to run on the schedule that I used. Does anyone have any suggestions on how to run scripts without them being killed by the OS?

Thanks
 

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script(1)							   User Commands							 script(1)

NAME
script - make record of a terminal session SYNOPSIS
script [-a] [filename] DESCRIPTION
The script utility makes a record of everything printed on your screen. The record is written to filename. If no file name is given, the record is saved in the file typescript. See WARNINGS. The script command forks and creates a sub-shell, according to the value of $SHELL, and records the text from this session. The script ends when the forked shell exits or when Control-d is typed. OPTIONS
The following option is supported: -a Appends the session record to filename, rather than overwriting it. NOTES
script places everything that appears on the screen in filename, including prompts. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsu | +-----------------------------+-----------------------------+ |CSI |Enabled | +-----------------------------+-----------------------------+ SEE ALSO
attributes(5) WARNINGS
script can pose a security risk when used in directories that are writable by other users (for example, /tmp), especially when run by a privileged user, that is, root. Be sure that typescript is not a link before running script. SunOS 5.11 30 Jan 2004 script(1)
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