nofile settings missing for memcached_server role

[Bjoern]

I noticed that we can increase the limits of connections within memcached but do not configure the actual nofile limit, which ultimately will cause memcached crashes.
I like to back port this issues into all open branches

[Bjoern (bjoern-t)]

Proposed review for master: https://review.openstack.org/#/c/317030/

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/317030
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-memcached_server/commit/?id=5c2d8c55ec51bee993d134aa9d4484879b762d62
Submitter: Jenkins
Branch: master

commit 5c2d8c55ec51bee993d134aa9d4484879b762d62
Author: Bjoern Teipel <email address hidden>
Date: Mon May 16 11:48:53 2016 -0500

    Configure nofile OS limit for memcached server role

    This fix adds a new override `memcached_connections` which is
    automatically calculated from the number of memcached
    connection limit plus additional 1k to configure the OS nofile limit.
    Without proper nofile limit configuration, memcached will crash
    in order to support higher parallel connection TCP/Memcache counts.

    Closes-Bug: #1582288

    Change-Id: I558ba329b7247cdfcf660e392c3ae0c4a0d65a53

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: stable/mitaka
Review: https://review.openstack.org/319267

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: liberty
Review: https://review.openstack.org/319280

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/319267
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible-memcached_server/commit/?id=045b2d8f544bc563372c9d82cee94789abf3d3bb
Submitter: Jenkins
Branch: stable/mitaka

commit 045b2d8f544bc563372c9d82cee94789abf3d3bb
Author: Bjoern Teipel <email address hidden>
Date: Mon May 16 11:48:53 2016 -0500

    Configure nofile OS limit for memcached server role

    This fix adds a new override `memcached_connections` which is
    automatically calculated from the number of memcached
    connection limit plus additional 1k to configure the OS nofile limit.
    Without proper nofile limit configuration, memcached will crash
    in order to support higher parallel connection TCP/Memcache counts.

    Closes-Bug: #1582288

    Change-Id: I558ba329b7247cdfcf660e392c3ae0c4a0d65a53
    (cherry picked from commit 5c2d8c55ec51bee993d134aa9d4484879b762d62)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/319280
Committed: https://git.openstack.org/cgit/openstack/openstack-ansible/commit/?id=a9185101a37cdf21c08fb95dbff1010e24128888
Submitter: Jenkins
Branch: liberty

commit a9185101a37cdf21c08fb95dbff1010e24128888
Author: Bjoern Teipel <email address hidden>
Date: Fri May 20 09:27:53 2016 -0500

    Configure nofile OS limit for memcached server role

    This fix adds a new override `memcached_connections` which is
    automatically calculated from the number of memcached
    connection limit plus additional 1k to configure the OS nofile limit.
    Without proper nofile limit configuration, memcached will crash
    in order to support higher parallel connection TCP/Memcache counts.

    Related-To: https://review.openstack.org/#/c/317030/

    Change-Id: Ib9a3a5fdf567e6024819ebcfd574a5d1d15e5e23
    Closes-Bug: #1582288

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/openstack-ansible-memcached_server 13.1.2 release.

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/openstack-ansible 12.0.14 release.

[Thierry Carrez (ttx)]

This issue was fixed in the openstack/openstack-ansible-memcached_server 14.0.0.0b1 development milestone.