Re: pcp updates: pmdadocker

Hi Lukas,

On 2016-12-09 22:39, Lukas Berk wrote:
> 
> If I could get a review on my pmdadocker branch it'd be most
> appreciated.  More qa needs to be added with a fake http request/reply
> but the jist of the pmda is there.

This is certainly an interesting area of work! Few higher level questions:

- Is this PMDA intended to be purely for Docker-based containers also in
the long run or could it be expanded to be a generic pmdacontainer to
support alternatives like rkt and OCI as well? Since there is a growing
momentum to avoid fragmentation and standardize in this area (see
https://www.opencontainers.org/) perhaps it would be wise for PCP to be
format/vendor neutral in this area, too?

- How do you envision this PMDA to work with container management
systems like OpenShift / Kubernetes or Mesos and how it would
intermingle with concepts like pods where there is 1-N containers per
pod? Are there perhaps plans to provide higher level PCP components
which would better match to container management systems' abstraction
levels (see also the next question)?

- Since containers / pods are most often considered ephemeral and there
may be N replicas of a pod running at any time, is this kind of dynamics
something in scope for PCP to be aware of? I mean, for example, if there
are N replicas of a pod which each happen to contain M containers, and
I'd want to get an overview of them, how would this work with PCP? Also,
if a node hosting pods goes down or the pods get replaced for whatever
reason, how to take this into account, esp. with archive mode? Since
higher level management tools abstract away the need to care where and
when an individual container is running a tool that merely connects to a
single, hand-picked container feels perhaps a bit developer oriented -
would you say that this is the intent or my imagination only or merely
the current state of affairs which is aimed to be improved during the
next steps on this front?

Thanks,

-- 
Marko Myllynen

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