Hi Piers, Alternatively, you could use flock to do the same.
Something like this, http://www.elevatedcode.com/2013/05/07/flock-for-cron-jobs.html -Manoj.C On Wed, Feb 13, 2019 at 1:40 PM Tony White via luv-main <[email protected]> wrote: > Hi Piers, > You could try creating a new file in the /tmp folder in process > then remove it on closing of the script. Subsequent scripts might > start then check for for the presence of this file. If it exists > simply delay until it is gone or exit the script. > Don't forget to log the exec and the exits if they are produced. > At least you will then see the issues clearly. > > > Example > #ScriptRun > # > while fileexists /tmp/ScriptOn > Sleep(5) > # or > if FileExists /tmp/ScriptOn Exit; > CreateFile /tmp/ScriptOn > #Do the rest of your work after the check. > ... > #On exit from current instance > Ddeletefile /tmp/ScriptOn > > Hope this helps. > > best wishes > Tony White > > On 13/2/19 12:45 pm, Piers via luv-main wrote: > > Hi there, > > > > I have a server that regularly runs jobs to import email via IMAP from > remote servers. > > > > The cron runs a bash scrip that in turn iterates through the customer's > install directories and then goes through each > > mail box that users have configured and parses the email. This is done > by going back to get 100 email headers checking > > that the message ID hasn't been imported and if not getting the full > body. > > > > The problem is that these jobs seem to run over each other and then > eventually (occasionally) it will hang the server. > > > > I've tried a few things like getting less headers, spacing the cron jobs > out and using lock files but neither combination > > has resolved this issue. I suspect that some of the IMAP services take > too long to respond or rate limit connections (but > > since I don't control them I can't be sure). > > > > I am looking for suggestions as to: > > > > - How to fix the underlying problem > > > > - How to configure Nagios to monitor specific processes > > > > Many thanks > > > > Piers > > > > > > _______________________________________________ > > luv-main mailing list > > [email protected] > > https://lists.luv.asn.au/cgi-bin/mailman/listinfo/luv-main > > _______________________________________________ > luv-main mailing list > [email protected] > https://lists.luv.asn.au/cgi-bin/mailman/listinfo/luv-main >
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