Make a User "nice"

Ryujin · 2007-05-03 03:34:25

I figure with the intense bash skils in the Arch community this should be an easy question,

I need to create a user who automaticly invokes

nice --adjustment=20

on ALL commands for a hybrid cluster environment, can anyone tell me how this can be done?

This will basicly make the user a total pushover and thier processes will all be superceded by any other system activity

Last edited by Ryujin (2007-05-03 03:36:29)

somairotevoli · 2007-05-03 07:23:36

DO you mean something like

renice 20 -u user

dmartins · 2007-05-03 07:58:08

How is the user executing commands? Will they all be through bash (or some other shell), or will they be X apps? ie run from a menu in X?

Ryujin · 2007-05-03 18:00:05

The commands will be executed through rsh and ssh from a head node, so each command is a new login

Ryujin · 2007-05-03 18:10:04

that renice might work, I could put it on a cron job that executes every couple of minutes to make sure that all processes for the given user are bumped down, although that starts to get messy with multiple users, is there a way to make all bash commands for a user just have a prefix so the user can only invoke processes at nice 19?

somairotevoli · 2007-05-03 22:48:16

My understanding is that the command will only have to ran once. I use it to renice all my main user processes to -15. All processes started afterwards still start @ -15.

Leffe · 2007-05-04 14:11:34

I'd take a look at /etc/security/limits.conf and see if anything can be done with the priority setting. I don't think I've ever had limits.conf work for me though.

briest · 2007-05-04 18:36:35

/etc/security/limits.conf is a config file for pam_limits module. So, you have to check that:

- your ssh/rsh daemon can use PAM
- it is configured to do so (i.e. OpenSSH PAM support is a bit messy and defaults change between versions)
- its pam config uses pam_limits

Last edited by briest (2007-05-04 18:36:54)

Ryujin · 2007-05-10 14:32:08

Sorry about being late to reply (I have been out of town), these should help! I will post some info once I get the system running!

harlekin · 2007-05-10 20:23:13

I don't really know wether you want this or wether it's working as I didn't test it by myself. But I found that you can set the priority of processes being launched in /etc/passwd.

You just have to insert pri=[nice_factor] in the user's info field.
Syntax is:
Username: Password: UID: GID: Info: Home: Shell

I got it from here (sorry about a german page. I'm sure you'll find a english one): http://www.linuxfibel.de/useradmin.htm

Ryujin · 2007-05-11 02:37:20

WOW! Thanks! that will work much better! Thanks a ton, I will tell you how it goes!

Arch Linux

#1 2007-05-03 03:34:25

Make a User "nice"

#2 2007-05-03 07:23:36

Re: Make a User "nice"

#3 2007-05-03 07:58:08

Re: Make a User "nice"

#4 2007-05-03 18:00:05

Re: Make a User "nice"

#5 2007-05-03 18:10:04

Re: Make a User "nice"

#6 2007-05-03 22:48:16

Re: Make a User "nice"

#7 2007-05-04 14:11:34

Re: Make a User "nice"

#8 2007-05-04 18:36:35

Re: Make a User "nice"

#9 2007-05-10 14:32:08

Re: Make a User "nice"

#10 2007-05-10 20:23:13

Re: Make a User "nice"

#11 2007-05-11 02:37:20

Re: Make a User "nice"

Board footer