Improve reliability of docker containers

[Fabrizio Soppelsa]

Improve the reliability of the Fuel Master node docker containers.
A /var partition data fillup should not corrupt them.

Discuss auto-recover, preventive measures, monitoring strategies.

[Fabrizio Soppelsa (fsoppelsa)]

See also https://blueprints.launchpad.net/fuel/+spec/isolate-var-log-on-master

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/170823

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/170823
Committed: https://git.openstack.org/cgit/stackforge/fuel-main/commit/?id=5ca339f8ed6e8f2de877eac5f21b2442bae56194
Submitter: Jenkins
Branch: master

commit 5ca339f8ed6e8f2de877eac5f21b2442bae56194
Author: Matthew Mosesohn <email address hidden>
Date: Mon Apr 6 14:48:56 2015 +0300

    Create logvol /var/lib/docker and balance usage

    Modified Fuel Master partition schema to match
    the following schema:
      * swap default
      * / 10gb
      * /var 10gb + 30% of remaining free space
      * /var/log 4gb + 50% of remaining free space
      * /var/lib/docker 17gb + 20% of remaining free space

    Effectively, the following partition changes are made:
      * Reduce /var to 30% of remaining free space (was 60%)
      * Increase /var/log to 50% of remaining free space (was 40%)
      * Add new logvol /var/lib/docker (17gb + 20% remaining)
      * Raise minimum disk size to 41GB

    This new logvol will prevent docker from running out
    of disk space because of logs, diagnostic snapshots,
    or Fuel backup.

    Change-Id: I79b0ebfeeddbef67e4c7c1650b6cdc2b8ea96937
    Closes-Bug: #1415946
    Doc-Impact: ops

[Alexander Arzhanov (aarzhanov)]

Verified on #476 iso

api: '1.0'
astute_sha: 5d570ae5e03909182db8e284fbe6e4468c0a4e3e
auth_required: true
build_id: 2015-05-27_22-12-45
build_number: '476'
feature_groups:
- mirantis
fuel-library_sha: ca9dc7589b9a1f7db945df0fb7c6bd21b60f0280
fuel-ostf_sha: 4cd2fef040ae9e7645a6b17a7cb44d3cd8fbe0be
fuelmain_sha: 6b5712a7197672d588801a1816f56f321cbceebd
nailgun_sha: ac8668cc06368fe22330e293c9ce8655d46846bd
openstack_version: 2014.2.2-6.1
production: docker
python-fuelclient_sha: e19f1b65792f84c4a18b5a9473f85ef3ba172fce
release: '6.1'
release_versions:
  2014.2.2-6.1:
    VERSION:
      api: '1.0'
      astute_sha: 5d570ae5e03909182db8e284fbe6e4468c0a4e3e
      build_id: 2015-05-27_22-12-45
      build_number: '476'
      feature_groups:
      - mirantis
      fuel-library_sha: ca9dc7589b9a1f7db945df0fb7c6bd21b60f0280
      fuel-ostf_sha: 4cd2fef040ae9e7645a6b17a7cb44d3cd8fbe0be
      fuelmain_sha: 6b5712a7197672d588801a1816f56f321cbceebd
      nailgun_sha: ac8668cc06368fe22330e293c9ce8655d46846bd
      openstack_version: 2014.2.2-6.1
      production: docker
      python-fuelclient_sha: e19f1b65792f84c4a18b5a9473f85ef3ba172fce
      release: '6.1'