Lots of telnet sessions

[George Toft]

What does vmstat tell you - are you paging too much?

George



Bill Warner wrote:
> 
> Anyone with experience on Linux with large numbers of users telneted in?
> (500+)
> 
> 9:23am  up 1 day,  8:50, 482 users,  load average: 143.52, 87.73, 44.33
> 
> typical usage is ~4-5 load
> 
> When ever a connection drops from a user the telnetd seems to spin out
> of control for about 2 minutes before finally dieing.  Some times one of
> our off site clients with a shacky t1 line drops 100+ users.  We are
> keeping track of it with a script that parses a ps -ef and hunts down
> and kills these processes as fast as it can find them.  This seems like
> quite a hack to me :)
> 
> also,
> 
> has anyone seen where a ps will take a long time to run.  I know we have
> quite a race condition (that hasn't really affected us that we know of)
> in the way our script runs, because a ps seems to take from 2-5minutes
> to run.  This is a system with 2k processes at any one time.
> 
> any suggestions would be cool.
> 
> Thanks
> 
> ps...for the security concerned about telnet running this is all on a
> firewalled lan.  the off site connection is a dedicated t1.  These
> systems don't send any traffic over the Internet directly.  Although not
> great for keeping out inside hackers we are pretty secure from the
> Internet.
> 
> --
> Bill Warner
> Unix/Linux Admin.
> Direct Alliance Corporation
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