nova-manage won't work on a compute node

[Alexander Kurenyshev]

Steps to reproduce:
1) Install master node
2) Create new environment (Ubuntu, any network)
3) Deploy simple environment includes compute node
4) Go to the compute node after deployment finished and run `nova-manage service list` command

Expected result:
There are a list with running services over the all nodes

Actual behaviour:
There is an error about missing memcahce package:
root@node-2:~# nova-manage service list
Command failed, please check log for more info
2015-06-11 12:00:06.837 2491 CRITICAL nova [req-0d9c39fc-e131-4ee3-bc51-6983a8858bc0 None] ImportError: No module named memcache
2015-06-11 12:00:06.837 2491 TRACE nova Traceback (most recent call last):
2015-06-11 12:00:06.837 2491 TRACE nova File "/usr/bin/nova-manage", line 10, in <module>
2015-06-11 12:00:06.837 2491 TRACE nova sys.exit(main())
2015-06-11 12:00:06.837 2491 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/cmd/manage.py", line 1401, in main
2015-06-11 12:00:06.837 2491 TRACE nova ret = fn(*fn_args, **fn_kwargs)
2015-06-11 12:00:06.837 2491 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/cmd/manage.py", line 705, in list
2015-06-11 12:00:06.837 2491 TRACE nova services = availability_zones.set_availability_zones(ctxt, services)
2015-06-11 12:00:06.837 2491 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/availability_zones.py", line 103, in set_availability_zones
2015-06-11 12:00:06.837 2491 TRACE nova service['host'], az)
2015-06-11 12:00:06.837 2491 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/availability_zones.py", line 126, in update_host_availability_zone_cache
2015-06-11 12:00:06.837 2491 TRACE nova cache = _get_cache()
2015-06-11 12:00:06.837 2491 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/availability_zones.py", line 47, in _get_cache
2015-06-11 12:00:06.837 2491 TRACE nova MC = memorycache.get_client()
2015-06-11 12:00:06.837 2491 TRACE nova File "/usr/lib/python2.7/dist-packages/nova/openstack/common/memorycache.py", line 38, in get_client
2015-06-11 12:00:06.837 2491 TRACE nova import memcache
2015-06-11 12:00:06.837 2491 TRACE nova ImportError: No module named memcache
2015-06-11 12:00:06.837 2491 TRACE nova

Fuel used:
api: '1.0'
astute_sha: 7766818f079881e2dbeedb34e1f67e517ed7d479
auth_required: true
build_id: 2015-06-08_06-13-27
build_number: '521'
feature_groups:
- mirantis
fuel-library_sha: f43c2ae1af3b493ee0e7810eab7bb7b50c986c7d
fuel-ostf_sha: 7c938648a246e0311d05e2372ff43ef1eb2e2761
fuelmain_sha: bcc909ffc5dd5156ba54cae348b6a07c1b607b24
nailgun_sha: 4340d55c19029394cd5610b0e0f56d6cb8cb661b
openstack_version: 2014.2.2-6.1
production: docker
python-fuelclient_sha: 4fc55db0265bbf39c369df398b9dc7d6469ba13b
release: '6.1'
release_versions:
  2014.2.2-6.1:
    VERSION:
      api: '1.0'
      astute_sha: 7766818f079881e2dbeedb34e1f67e517ed7d479
      build_id: 2015-06-08_06-13-27
      build_number: '521'
      feature_groups:
      - mirantis
      fuel-library_sha: f43c2ae1af3b493ee0e7810eab7bb7b50c986c7d
      fuel-ostf_sha: 7c938648a246e0311d05e2372ff43ef1eb2e2761
      fuelmain_sha: bcc909ffc5dd5156ba54cae348b6a07c1b607b24
      nailgun_sha: 4340d55c19029394cd5610b0e0f56d6cb8cb661b
      openstack_version: 2014.2.2-6.1
      production: docker
      python-fuelclient_sha: 4fc55db0265bbf39c369df398b9dc7d6469ba13b
      release: '6.1'

[Roman Podoliaka (rpodolyaka)]

nova-manage is an auxiliary tool for managing of Nova deployments. Often, it does not use public Nova API, but works directly with a DB instead, which means it can't be used on the compute nodes (as conceptually those don't have direct access to DB, at least from Nova point of view).

Please use `nova service-list` instead.

Still, this can be a valid issue in a sense, that we should not ship nova-manage binary on computes, if it's not usable.

[Roman Podoliaka (rpodolyaka)]

No longer fixing medium bugs in 7.0, moving to 8.0

[Roman Podoliaka (rpodolyaka)]

Per https://blueprints.launchpad.net/nova/+spec/deprecate-service-management-in-nova-manage I'm not sure we need to care about this 8.0 either.