[Pacemaker] Get group behaviour with Master slave or clones envolved

[Andrew Beekhof]

On 17 Feb 2014, at 10:34 pm, Néstor C. <xalabin at gmail.com> wrote:

> 
> 
> 
> 2014-02-17 1:22 GMT+01:00 Andrew Beekhof <andrew at beekhof.net>:
> 
> On 21 Jan 2014, at 10:50 pm, Néstor C. <xalabin at gmail.com> wrote:
> 
> >> Hello.
> >>
> >> When you need that some primitives switch in block you can use a group.
> 
> >Groups are just a syntactic shortcut for ordering and colocation constraints.
> 
> There is a manner of view this "hyde" contraints? 
> 
> 
> >>
> >> There is a manner to get this when you have a clone or a master/slave involved?
> >>
> >> For example:
> >>
> >> Imagine a drbd disk (DR), a filesystem over ti (FS) and a service over all (SRV).
> >> The first one is a ms resource, and the other, primitives.
> >>
> >> The colocation rules are:
> >> colocation fs_on_dr inf: FS DR:Master
> >> colocation srv_on_fs inf: SRV FS
> >>
> >> The order rules are:
> >> order fs_after_dr inf: DR:promote FS:start
> >> order srv_after_fs inf: FS:start SRV:start
> >>
> >> How can switch the entire cluster to other node if SRV fails? (like if all was in a group)
> 
> >In what way does it not do so already with the above constraints?
> 
> I want some kind of  "circular constraint"

We actively detect and prevent colocation and ordering loops.
What version of pacemaker is this?

> like if srv fails move the entire stack to other node.
> If i add other constraint like:
> colocation dr on srv inf: DR:Master SRV
> 
> It doesn't start.
> 
> Thanks!
>  
> 
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