Daniel Bray wrote:
> On Tue, 2007-03-27 at 10:13 +0200, Andrew Beekhof wrote:
>
>> You're trying to start pingd by two ways - both by the respawn
>> directive, and also as a resource.
>>
>> You can't do that.
>>
>> And, you're not using the attribute that pingd is creating in your
>> CIB.
>>
>> See http://linux-ha.org/pingd for a sample rule to use a pingd
>> attribute
>> - or you can see my linux-ha tutorial for similar information:
>> http://linux-ha.org/HeartbeatTutorials - first tutorial listed
>> starting at about slide 139...
>>
>> Here's the example from the pingd page:
>>
>> <rsc_location id="my_resource:not_connected" rsc="my_resource">
>> <rule id="my_resource:not_connected:rule" score="-INFINITY">
>> <expression id="my_resource:not_connected:expr"
>> attribute="pingd_score" operation="not_defined"/>
>> </rule>
>> </rsc_location>
>>
>> In fact, I'm not 100% sure it's right...
>>
>> it does exactly what the title claims it will:
>> "Only Run my_resource on Nodes with Access to a Single Ping Node"
>>
>> there are other examples on that page that cover more complicated
>> scenarios, complete with worked solutions
>>
>>
>> I think the example from the tutorial is a little more general...
>>
>> <rsc_location id="my_resource:connected" rsc="my_resource">
>> <rule id="my_resource:connected:rule"
>> score_attribute="pingd" >
>> <expression id="my_resource:connected:expr:defined"
>> attribute="pingd"
>> operation="defined"/>
>> </rule>
>> </rsc_location>
>>
>>
>> What this rule says is:
>>
>> For resource "my_resource", add the value of the pingd attribute
>> to the amount score for locating my_resource on a given
>> machine.
>>
>> For your example flags to pingd, you use a multiplier (-m flag) of
>> 100,
>> so having access to 0 ping nodes is worth zero, 1 ping nodes is worth
>> 100 points, 2 ping nodes is worth 200 points, and so on...
>>
>> So, if one node has access to a ping node and the other one does not
>> have access to a ping node, then the first node would get 100 added to
>> its location score, and the second node would have an unchanged
>> location
>> score.
>>
>> If the the second node scored as much as 99 points higher than the
>> first
>> node, it would locate the resource on the first node. If you don't
>> like
>> that, you can change your ping count multiplier, write a different
>> rule,
>> or add a rule.
>>
>> You can change how much ping node access is worth with the -m flag, or
>> the "multiplier" attribute in the pingd resource. Note that you
>> didn't
>> supply a multiplier attribute in your pingd resource - so it would
>> default to 1 -- probably not what you wanted...
>>
>> And, don't run pingd twice - especially not with different
>> parameters...
>
>
>
> Thanks for the detailed feedback!
>
>
> I've made the alterations you suggested, via the GUI, but saw some
> issues. I think one of my biggest issues here, is all the documentation
> points to creating XML files by hand, and then "importing" them into the
> cluster. What I'm trying to do, is strictly use the GUI, so that I can
> do some video documentation for the rest of my team. Once I have
> everything working, I will distribute the videos so that my team members
> can learn from this. Unfortunately, things don't always work as
> expected from within the GUI.
>
> For instance, in your example above:
>
> <rsc_location id="my_resource:not_connected" rsc="my_resource">
> <rule id="my_resource:not_connected:rule" score="-INFINITY">
> <expression id="my_resource:not_connected:expr"
> attribute="pingd_score" operation="not_defined"/>
> </rule>
> </rsc_location>
>
> You don't have a "value" set for the expression. In the GUI, it will
> not let you add an expression like that, unless you give it a value.
> Here is my updated config files.
The GUI is running behind where we'd like for it to be, unfortunately
:-( We added a bunch of features and changed a number of things at a
time when there was little effort being put into the GUI.
By the way, you might be interested in the newly-founded education
sub-project:
http://linux-ha.org/Education
which has a screencast (video) for a simple GUI operation, here:
http://linux-ha.org/Education/Newbie/IPaddrScreencast
I haven't finished adding all the audio for it. Maybe I can do that today?
--
Alan Robertson <[EMAIL PROTECTED]>
"Openness is the foundation and preservative of friendship... Let me
claim from you at all times your undisguised opinions." - William
Wilberforce
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