[ClusterLabs] R: Re: Antw: Re: Ordering Sets of Resources

[ivagal at libero.it]

You are right, but i had to use option symmetrical=false because i need to 
stop, when all resources are running, even the single primitive with no impact 
to others resources.

I have also used symmetrical=false with kind=Optional.
The stop of the individual resource does not stop the others resources, but if 
during the startup or shutdown of the resources is used a list of primitives 
without any order, the resources will start or stop without respecting the 
constraint strictly.

Regards
Ivan


>----Messaggio originale----
>Da: "Ken Gaillot" <kgaillot at redhat.com>
>Data: 01/03/2017 15.57
>A: "Ulrich Windl"<Ulrich.Windl at rz.uni-regensburg.de>, <users at clusterlabs.org>
>Ogg: Re: [ClusterLabs] Antw: Re:  Ordering Sets of Resources
>
>On 03/01/2017 01:36 AM, Ulrich Windl wrote:
>>>>> Ken Gaillot <kgaillot at redhat.com> schrieb am 26.02.2017 um 20:04 in 
Nachricht
>> <dbf562ff-a830-fc3c-84dc-487b892fcba4 at redhat.com>:
>>> On 02/25/2017 03:35 PM, ivagal at libero.it wrote:
>>>> Hi all,
>>>> i have configured a two node cluster on redhat 7.
>>>>
>>>> Because I need to manage resources stopping and starting singularly when
>>>> they are running I have configured cluster using order set constraints.
>>>>
>>>> Here the example
>>>>
>>>> Ordering Constraints:
>>>>   Resource Sets:
>>>>     set MYIP_1 MYIP_2 MYFTP MYIP_5 action=start sequential=false
>>>> require-all=true set MYIP_3 MYIP_4 MYSMTP action=start sequential=true
>>>> require-all=true setoptions symmetrical=false
>>>>     set MYSMTP MYIP_4 MYIP_3 action=stop sequential=true
>>>> require-all=true set MYIP_5 MYFTP MYIP_2 MYIP_1 action=stop
>>>> sequential=true require-all=true setoptions symmetrical=false 
kind=Mandatory
>>>>
>>>> The constrait work as expected on start but when stopping the resource
>>>> don't respect the order.
>>>> Any help is appreciated
>>>>
>>>> Thank and regards
>>>> Ivan
>>>
>>> symmetrical=false means the order only applies for starting
>> 
>> From the name (symmetrical) alone it could also mean that it only applies 
for stopping ;-)
>> (Another example where better names would be nice)
>
>Well, more specifically, it only applies to the action specified in the
>constraint. I hadn't noticed before that the second constraint here has
>action=stop, so yes, that one would only apply for stopping.
>
>In the above example, the two constraints are identical to a single
>constraint with symmetrical=true, since the second constraint is just
>the reverse of the first.
>
>
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