I don't think that particular use of ifelapsed would work if the resource
intensive update is also potentially disruptive, so constrained only to be
checked at "Night". The first 5-minute interval in which that promise is
checked, it will be about 18 hours old so all will be done together. The
nearest I have got to this sort of thing is to split my set of clients into 5
pseudo-random groups:-
bundle common class
{
classes:
"Ip0" expression => classmatch("ipv4_[0-9]*_[0-9]*_[0-9]*_[0-9]*[05]");
"Ip1" expression => classmatch("ipv4_[0-9]*_[0-9]*_[0-9]*_[0-9]*[16]");
"Ip2" expression => classmatch("ipv4_[0-9]*_[0-9]*_[0-9]*_[0-9]*[27]");
"Ip3" expression => classmatch("ipv4_[0-9]*_[0-9]*_[0-9]*_[0-9]*[38]");
"Ip4" expression => classmatch("ipv4_[0-9]*_[0-9]*_[0-9]*_[0-9]*[49]");
"Hrs0" or => { "Hr00", "Hr06", "Hr12", "Hr18" };
"Hrs1" or => { "Hr01", "Hr07", "Hr13", "Hr19" };
"Hrs2" or => { "Hr02", "Hr08", "Hr14", "Hr20" };
"Hrs3" or => { "Hr03", "Hr09", "Hr15", "Hr21" };
"Hrs4" or => { "Hr04", "Hr10", "Hr16", "Hr22" };
"Hrs5" or => { "Hr05", "Hr11", "Hr17", "Hr23" };
}
Then combine these along with splaytime (There is a catch-all in the last hour
of the shift):-
bundle agent distribute
{
classes:
"Dist0" and => { Ip0, Hrs0 };
"Dist1" and => { Ip1, Hrs1 };
"Dist2" and => { Ip2, Hrs2 };
"Dist3" and => { Ip3, Hrs3 };
"Dist4" and => { Ip4, Hrs4 };
"Dist" or => { Dist0, Dist1, Dist2, Dist3, Dist4, Hrs5 };
"once_hourly" expression => splayclass("$(sys.host).$(sys.ipv4)", "hourly");
"dist_now" and => { once_hourly, Dist };
}
The actual work uses dist_now:: - but could equally well use dist_now.Night::
instead.
It would be far simpler to arrange this if there was a third possibility in the
second argument to splay class - "shift" to mean "once in a 6 hour shift". Is
this sufficient detail and justification to be considered a feature request?
(Apologies in advance - I realise this is close to a repeat of my previous
posting a few days ago).
Chris Ritson (Computing Officer and School Safety Officer)
Room 707, Claremont Tower, EMAIL: [email protected]
School of Computing Science, PHONE: +44 191 222 8175
Newcastle University, FAX : +44 191 222 8232
Newcastle upon Tyne, UK NE1 7RU. WEB : http://www.cs.ncl.ac.uk/
>-----Original Message-----
>From: [email protected] [mailto:help-cfengine-
>[email protected]] On Behalf Of Mark Burgess
>Sent: 28 April 2011 07:33
>To: Michael Stevens
>Cc: help-cfengine
>Subject: Re: Cfengine Help: Re: Avoiding "Duplicate selection of value"
>
>
>We can look into it if you file a feature request, but I'm not sure it's
>desirable. You can still do your updates every 15 mins even though the
>agent wakes up every 5 if you set the ifelapsed default to 15 mins or
>more.
>
>On 27/04/11 23:32, Michael Stevens wrote:
>> We conceivably could, there's not really a reason other than it
>doesn't seem necessary to update that often. I may well change it just
>to get splayclass working. Any chance of getting the splayclass interval
>as a settable parameter?
>>
>> On Apr 27, 2011, at 11:54 AM, Mark Burgess wrote:
>>
>>> Ah, I see what you mean. Sorry. You're right, one has to assume a
>resolution to do the hashing. Any reason why you can't up to 5 min
>resolution?
>>>
>>> On 27/04/11 19:48, Michael Stevens wrote:
>>>> How would I go about having splayclass work with our current */15
>run interval?
>>>>
>>>> On Apr 26, 2011, at 9:20 PM, Mark wrote:
>>>>
>>>>> No nothing is hardcoded, but the default exec time is 5 minutes.
>You are not missing out.
>>>>>
>>>>>
>>>>> Mark
>>>>>
>>>>>
>>>>> On 27 Apr 2011, at 01:09, Michael Stevens<[email protected]> wrote:
>>>>>
>>>>>> I wasn't aware of this. Correct me if I'm wrong, but from reading
>the docs, the "on" interval is hard-coded to 5 minutes, eg, since we're
>running cf3 every 15 minutes from cron, we'd miss 2/3 of the activations
>unless we up our schedule to every 5 minutes.
>>>>>>
>>>>>> On Apr 26, 2011, at 11:19 AM, [email protected] wrote:
>>>>>>
>>>>>>> Have you looked a splayclass? It can randomize when promises are
>kept without
>>>>>>> the overhead of calling a shell.
>>>>>>> http://www.cfengine.org/manuals/cf3-reference.html#Function-
>splayclass
>>>>>> _______________________________________________
>>>>>> Help-cfengine mailing list
>>>>>> [email protected]
>>>>>> https://cfengine.org/mailman/listinfo/help-cfengine
>>>>
>>
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