[ClusterLabs] system or ocf resource agent

[Klaus Wenninger]

On 07/08/2016 06:15 PM, Ken Gaillot wrote:
> On 07/08/2016 05:10 AM, Heiko Reimer wrote:
>> Hi,
>>
>> i am setting up new debian 8 ha cluster with drbd, corosync and
>> pacemaker with apache and mysql. In my old environment i had configured
>> resources with ocf resource agents. Now i have seen that there is
>> systemd. Which agent would you recommend?
>>
>>
>> Mit freundlichen Grüßen / Best regards
>>  
>> Heiko Reimer
>
> There's no one answer for all services. Some things to consider:
>
> * Only OCF agents can take parameters, so they may have additional
> capabilities that the systemd agent doesn't.
>
> * Only OCF agents can be used for globally unique clones, clones that
> require notifications, and multistate (master/slave) resources.
>
> * OCF agents are usually written to support a variety of
> OSes/distributions, while systemd unit files are often tailored to the
> particular system. This can give OCF an advantage if you have a variety
> of OSes and want the resource agent to behave as identically as possible
> on all of them, or it can give systemd an advantage if you have a
> homogeneous environment and want to use OS-specific facilities as much
> as possible.
>
> * A lot depends on the particular service. Is the OCF agent widely used
> and actively developed? If so, it is more likely to have better features
> and enhanced support for running in a cluster; if not, the systemd unit
> may be more up-to-date with recent changes in the underlying service.
>
> * Your Pacemaker version matters. Pacemaker added systemd resource
> support in 1.1.8, but there were significant issues until 1.1.13, and
> minor but useful fixes since then.
One of the more recent changes you might be interested in if
experiencing problem with shutdown order
when systemd-services are involved ...
https://github.com/ClusterLabs/pacemaker/commit/6aae8542abedc755b90c8c49aa5c429718fd12f1
>
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