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[Chris <christian.schmitz@xxxxxxxxxxxxxx>]

Public bug reported:

I have multiple nova compute nodes and for maintenance reasons I want to
disable one of them.

Migration of a virtual machine is not possible, due to bug
https://bugs.launchpad.net/cinder/+bug/1348811, so it would be ok, if it
is not possible, to start a machine on that compute node.

I stopped virtual machine "foo" on compute node "bar"
$ nova stop 86db11f7-a1e4-4be0-880c-0720cd24c3aa

disabled nova-compute service
$ sudo nova-manage service disable bar nova-compute

and checked it with 
$ sudo nova-manage service list --host bar
------------------------------------------
Binary           Host                                 Zone             Status     State Updated_At
nova-compute     bar                            Cluster X        disabled   :-)   2015-08-10 12:29:10
------------------------------------------

Expected result:
VM foo is not able to run on that host

Actual result:
VM foo is able to run on that host

$ nova start 86db11f7-a1e4-4be0-880c-0720cd24c3aa
The machine is running 

I tested, if its possible to create new virtual machines on that compute node bar with the disabled nova-compute service
$ nova boot --image "c196615d-d3ed-49d7-8bc6-c65f8360aa02" --flavor m1.smaller --nic net-id=6a38402f-4a5b-4239-a683-ceb4ae220c30 --availability-zone "Cluster X":bar foo2

This machine is also running.

Versions:

$ dpkg -l | grep nova
ii  nova-common                         1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - common files
ii  nova-compute                        1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - compute node base
ii  nova-compute-kvm                    1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - compute node (KVM)
ii  nova-compute-libvirt                1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - compute node libvirt support
ii  python-nova                         1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute Python libraries
ii  python-novaclient                   1:2.17.0-0ubuntu1.2                   all          client library for OpenStack Compute API

$ dpkg -l | grep ceph
ii  ceph-common                         0.94.1-1trusty                        amd64        common utilities to mount and interact with a ceph storage cluster
ii  ceph-fs-common                      0.94.1-1trusty                        amd64        common utilities to mount and interact with a ceph file system
ii  ceph-fuse                           0.94.1-1trusty                        amd64        FUSE-based client for the Ceph distributed file system
ii  libcephfs1                          0.94.1-1trusty                        amd64        Ceph distributed file system client library
ii  python-cephfs                       0.94.1-1trusty                        amd64        Python libraries for the Ceph libcephfs library

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1483236

Title:
  It´s not possible to disable the nova compute service on one compute
  node

Status in OpenStack Compute (nova):
  New

Bug description:
  I have multiple nova compute nodes and for maintenance reasons I want
  to disable one of them.

  Migration of a virtual machine is not possible, due to bug
  https://bugs.launchpad.net/cinder/+bug/1348811, so it would be ok, if
  it is not possible, to start a machine on that compute node.

  I stopped virtual machine "foo" on compute node "bar"
  $ nova stop 86db11f7-a1e4-4be0-880c-0720cd24c3aa

  disabled nova-compute service
  $ sudo nova-manage service disable bar nova-compute

  and checked it with 
  $ sudo nova-manage service list --host bar
  ------------------------------------------
  Binary           Host                                 Zone             Status     State Updated_At
  nova-compute     bar                            Cluster X        disabled   :-)   2015-08-10 12:29:10
  ------------------------------------------

  Expected result:
  VM foo is not able to run on that host

  Actual result:
  VM foo is able to run on that host

  $ nova start 86db11f7-a1e4-4be0-880c-0720cd24c3aa
  The machine is running 

  I tested, if its possible to create new virtual machines on that compute node bar with the disabled nova-compute service
  $ nova boot --image "c196615d-d3ed-49d7-8bc6-c65f8360aa02" --flavor m1.smaller --nic net-id=6a38402f-4a5b-4239-a683-ceb4ae220c30 --availability-zone "Cluster X":bar foo2

  This machine is also running.

  Versions:

  $ dpkg -l | grep nova
  ii  nova-common                         1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - common files
  ii  nova-compute                        1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - compute node base
  ii  nova-compute-kvm                    1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - compute node (KVM)
  ii  nova-compute-libvirt                1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute - compute node libvirt support
  ii  python-nova                         1:2014.1.4-0ubuntu2.1                 all          OpenStack Compute Python libraries
  ii  python-novaclient                   1:2.17.0-0ubuntu1.2                   all          client library for OpenStack Compute API

  $ dpkg -l | grep ceph
  ii  ceph-common                         0.94.1-1trusty                        amd64        common utilities to mount and interact with a ceph storage cluster
  ii  ceph-fs-common                      0.94.1-1trusty                        amd64        common utilities to mount and interact with a ceph file system
  ii  ceph-fuse                           0.94.1-1trusty                        amd64        FUSE-based client for the Ceph distributed file system
  ii  libcephfs1                          0.94.1-1trusty                        amd64        Ceph distributed file system client library
  ii  python-cephfs                       0.94.1-1trusty                        amd64        Python libraries for the Ceph libcephfs library

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