David Boyes wrote:
[snip] BTW is it enough for a guest to send the Q
NAME command to keep the guest alive? I am trying to overcome the
problem of a guest logging off after someone accidentally disconnects
a
terminal session. Following an earlier suggestion on this mailing
list,
I want to schedule a cron to issue a CP Q NAME or CP Q V STORE only
to
keep the session alive. Would it work?
No. If the virtual machine is interrupted or placed in VM READ/CP READ
due to the console going away, then your Linux-based command automation
will never run -- the virtual machine is stopped waiting for that BEGIN
command.
The solution to your problem is to educate people to do what they need
to do via SCIF (CP SEND) or other means. There's zero reason to be
actually logging into the machine via the console during normal
operations.
Agree. But there are situations when you have to operate in single user
mode to fix problems. You have to log into the console. The z/VM
environment allows the virtual machine to be stopped when the terminal
session is interrupted - by mistake or due to the network dropping out.
I see this as a weakness in a production situation. Having raised this
issue a few times on this mailing list, I would like to know how best
one can prevent or overcome it. No one is suggesting wanton log in to a
terminal session and carelessly terminating without a disconnect.
Suppose someone pulls the plug on me or my VPN session disconnects while
I am not at my laptop. Any number of situations can lead to a
production guest disappearing. My point is that we need to identify,
understand the threat and find a way to deal with it. If there is no
other way, then we will accept that and work that into the procedure.
From what I understand that is probably the case here.
-- db
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Ranga Nathan
Work: 714-442-7591
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