Nodes not removed from /etc/hosts

[Roman Sokolkov]

Description:
/etc/hosts contains entries for nodes that were removed from cluster (or redeployed)

Environment:
- MOS 6.0
- any deployment mode
- any OS

How to reproduce:
1) Deploy cluster with 2 nodes (controller, compute).
2) Remove compute node from cluster (and push "Deploy changes")
3) Add same node to cluster (and push "Deploy changes")
4) Login to controller and check /etc/hosts
Expected result:
it will contain TWO entities (i.e. node-1, node-3)

Actual result:
it contains THREE entities (node-[1,2,3])

VERSION:
  feature_groups:
    - mirantis
  production: "docker"
  release: "6.0"
  api: "1.0"
  build_number: "58"
  build_id: "2014-12-26_14-25-46"
  astute_sha: "16b252d93be6aaa73030b8100cf8c5ca6a970a91"
  fuellib_sha: "fde8ba5e11a1acaf819d402c645c731af450aff0"
  ostf_sha: "a9afb68710d809570460c29d6c3293219d3624d4"
  nailgun_sha: "5f91157daa6798ff522ca9f6d34e7e135f150a90"
  fuelmain_sha: "81d38d6f2903b5a8b4bee79ca45a54b76c1361b8"

[Sebastian Kalinowski (prmtl)]

Please remember to add VERSION and diagnostic snapshot.

[Sergey Vasilenko (xenolog)]

looks like after any add-remove node operation
setup /etc/hosts task should be executed on each node on ENV.

Question: What should be happen if some ENV nodes are down at this time?

[Bogdan Dobrelya (bogdando)]

Good point. This also applies to any of the generic questions like "What if node X is down then the node Y was removed and how to retry this update operation for the component Z?" where Z is actually everything: /etc/hosts, corosync cluster, CEPH cluster, galera, AMQP etc.

So. how should we retry life-cycle management tasks? This cannot be fixed as a bug, this requires a separate lify management blueprint. There are probably some component should exist which would track pending update actions and accomplish them of report failed, eventually.

[Matthew Mosesohn (raytrac3r)]

This functionality would work automatically if this bug was fixed: https://bugs.launchpad.net/fuel/+bug/1485505
Marking as duplicate.

[OpenStack Infra (hudson-openstack)]

Change abandoned by Dmitry Ilyin (<email address hidden>) on branch: master
Review: https://review.openstack.org/197963