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Re: dividing into imports


From: Mark Burgess
Subject: Re: dividing into imports
Date: Sat, 21 Jan 2006 16:55:36 +0100

On Sat, 2006-01-21 at 14:55 +0100, John Smith wrote:
> I'm 99.999% sure no other instances are started, especially through cron.
> This is a testbox for cfengine, crontab is empty and I run each cfengine
> with a launch.sh, (see below) which cleans out cron after cfexecd runs.
> What I forgot to mention was that this is an older version: 2.1.10, 
> because it is the only common one we could get over all platforms.

Then what you suggest is simply not possible. Cfagent is not
multithreaded.

> I am building a separate test environment at the moment to track down
> this specific problem. Will keep you posted on my findings.
> 
> Sincerely,
> 
> Jan.
> 
> PS. Is address@hidden down, since I don't get any mails from
> it at the moment, but you _do_ answer? ;-)

No it's not down.


> =======================================================================
> 
> #!/bin/sh
> # COMMENTEDOUT='# '
> COMMENTEDOUT=
> NOWS=$(date +%S)
> NOWS=${NOWS#0}
> NOWM=$(date +%M)
> NOWM=${NOWM#0}
> NOWH=$(date +%H)
> NOWH=${NOWH#0}
> FROMNOW=1
> if [[ $NOWS > 58 ]] ; then
>   FROMNOW=2
> fi
> MIN=$(((${NOWM}+${FROMNOW})%60))
> HOUR=$(((${NOWH}+((${NOWM}+${FROMNOW})/60))%24))
> time (crontab -l ; echo $COMMENTEDOUT$MIN' '$HOUR' * * * echo "[d-i] 
> [postinstall] -run cfexecd-" ; /usr/sbin/cfexecd -F ; (crontab -l | grep -v 
> /usr/sbin/cfexecd) | crontab -') | crontab -
> 
> =======================================================================
> 
> On Sat, 21 Jan 2006 08:25:35 +0100
> Mark Burgess <address@hidden> wrote:
> 
> > 
> > I think that the only way this could happen (if I understand you
> > correctly) is if another instantiation of cfengine starts while you are
> > still copying the files across). Could this come from cron? Maybe you
> > need to make sure the copying happens quickly, or block the start of an
> > update while copying is taking place. You could do this by creating a
> > lock file like touch /etc/nocfengine and making actions conditional on
> > this??
> > 
> > I am not sure this is a correct diagnosis. What do you think? 
> > 
> > M
> > 
> > On Fri, 2006-01-20 at 22:32 +0100, John Smith wrote:
> > > Hi All,
> > > 
> > >   situation:
> > > 
> > >   bunch of servers and workstations, linux, bsd, solaris, hpux.
> > > 
> > >   there was a 1st attempt to use cfengine, but this was used 
> > > only to prevent known errors to ocure again (corrective).
> > > 
> > >   new project to roll out all servers anew, from installation
> > > servers, including cfengine in the 'paranoid' setting (installation,
> > > configuration, detection and correction).
> > > 
> > >   Divided my cfengine server from out of a cvs server into
> > > four separte policy environments, old, old-test, new and new-test 
> > > (with automatic transfer mechanisms for hosts between the different 
> > > environments), with a common update.conf which decides which 
> > > cfagent.conf from which environment a client gets, based on the 
> > > following criteria:
> > > 
> > >   iprange
> > >   os
> > >   domain 
> > >   policy (group membership)
> > > 
> > >   Commonly used variables are also centrally defined.
> > > 
> > >   The first criteria are defined as classes and groups and
> > > stored in a 'general.classes'. The second in a 'general.main' and
> > > consists of 1 large control section (without an actionsequence).
> > > 
> > >   Each policy environment consists of a cfagent.conf that
> > > does as little as possible except for to import the common 
> > > 'general.*' files and the policies own cfagent.* files and define
> > > an actionsequence. Purpose of the cfagent.* files to compartmentalize
> > > and share application settings among policies.
> > > 
> > >   The cfagent.conf (and policy dependent files) distribution
> > > according to policy, goes well. We even defined an 'alien' class
> > > for hosts that are not part of any policy and that get reported and
> > > taken care of very well.
> > > 
> > >   problem:
> > > 
> > >   It is with the action sequence that I run into trouble.
> > > 
> > >   Decesision was made for each cfexecd -F run to copy all 
> > > for the client relevant files from a central server, based on classes 
> > > etc. into a local data repository which at the end is copied in 1 go 
> > > into the live filesystem. It's purpose is to correct errors under a 
> > > DOS attack and directly after a reboot.
> > > 
> > >   First action is then 'copy', which is divided into multiple
> > > server to local repository copies and 1 final repository to /. All 
> > > following actions are policy dependent.
> > > 
> > >   My main problem is that the actions are started before the
> > > final copy (from the local repository to the live filesystem) is 
> > > finished. And yes, there is only one copy: statement.
> > > 
> > >   I tried several things (defines at the end of each copy
> > > statements to enforce sequence -they do not-, run everything 
> > > from 1 cfagent.conf), I can't get it to work.
> > > 
> > >   I presume that I make a fundamental mistake somewhere, so
> > > that's the main reason for this elaborate description.
> > > 
> > >   Can somebody please give a hint of what I do wrong or give
> > > a general description on how to take care of this problem.
> > > 
> > > Sincerely,
> > > 
> > > Jan.
> > > 
> > > 
> > > _______________________________________________
> > > Help-cfengine mailing list
> > > address@hidden
> > > http://lists.gnu.org/mailman/listinfo/help-cfengine
> > 





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