Memcached Role in Fedora Server 23

[Stephen Gallagher]

On Fri, 2015-07-17 at 09:23 -0400, Stephen Gallagher wrote:
> At this week's Fedora Server SIG meeting, I indicated that things 
> were
> looking bleak for landing the containerized memcached role in F23. It
> turns out things weren't as bad as I feared (with some caveats).
> 
> I was able to find the time this week (mostly by turning off IRC) to
> get the memcached role built. It's not the final version I was hoping
> for (producing a nulecule app), but it *can* serve memcached using 
> the
> official Fedora Dockerfiles version of the service uploaded to the
> Docker Hub.
> 
> What do I need help with?
>  * I need someone to run through the open code review requests[1]. I
> think things are in good shape, but I would prefer a second set of 
> eyes
> on them.
> 
> 
> So, what can it do right now?
>  * You can deploy a memcached role entirely on the local machine, the
> same way that you can deploy the database server role or the domain
> controller role.
>  * You can deploy the role with no arguments (it has sensible
> defaults).
>  * You can pass arguments to control the cache size, number of
> connections and number of threads.
>  * You can pass a special boolean argument "contained". This will 
> cause
> the role to be deployed by pulling down the fedora/memcached image 
> from
> Docker Hub and creating a systemd unit file to load it at boot.
> 
> Caveats:
>  * The containerized version is just that; memcached in a container. 
> It
> has no advanced orchestration capabilities.
>  * The version of the fedora/memcached image in the Docker Hub 
> doesn't
> have the capability to tune the same values as the local version. 
> Right
> now, these are ignored. I have a pull request[1] open to fix this.
> 
> 
> 
> [1] https://reviewboard-fedoraserver.rhcloud.com/r/
> [2] https://github.com/fedora-cloud/Fedora-Dockerfiles/pull/115


I just built a COPR repo containing all of the patches currently up for
code review: 
https://copr.fedoraproject.org/coprs/sgallagh/rolekit-prototypes/

Please feel welcome (nee: encouraged) to install it on F22, F23 or
Rawhide and put it through its paces.
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