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RE: cfengine failover on copy does not seem to work as documented

From: Mark Burgess
Subject: RE: cfengine failover on copy does not seem to work as documented
Date: Mon, 07 Nov 2005 07:11:37 +0100

On Mon, 2005-11-07 at 04:35 +0000, Chip Seraphine wrote:
> >> I'd rather have it simply triggered when we have any result other than
> >> either a sucessful copy *or* the copy is not attempted.   That would
> >> also catch things like "server up, file found but unreadable" (happens
> >> when you are reading from an NFS server with root squashed).
> >
> > In this case, I don't think it is right that cfengine tries to do an end
> > run around NFS. these seem to be orthogonal issues -- either you copy
> > from the server or you use NFS, but not both??
> I do indeed use both.  We have a core NFS server that provides various
> resources; if Cfengine uses those resources, I generally copy them into
> /var/cfengine first in order to provide some ability to function if the
> NFS server or network becomes unavailable.   I typically do cfengine
> copies from the server rather than have clients hit the NFS server
> directly so as to avoid having several hundred clients exercising the
> automounter in rapid succession, and also to allow hosts that are not NFS
> clients to be able to use the resources.
> I think the disagreement stems from an assumption that failover classes
> are used to try copies by other means (and that is indeed a fine use for
> them).  However, I primarily use the failover classes to trigger a
> complaint mechanism that alerts a monitoring system.  (IMHO, Cfengine [or
> any app] should not try to make assumptions about what the admin will do
> with information provided.)  Once I know cfengine did not know what I
> expected it to do, I can go poke around and find the exact problem.

Failover, in my world, is generally used to talk about network services
and that is the meaning it carries in cfengine today. I can agree that
there is a general need for some kind of exception handling for other
cases too. Then what you are really asking for is another kind of class


to complement failover=

This can be patched into the current cfengine without any real
difficulty. And it should be better designed in cfengine 3.

Is it not true that, if the file is unreadable, you get an error message


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