several services displayed for "magnum service-list"

[Jean Chorin]

Following the installation guide in https://docs.openstack.org/install-guide/index.html, I installed Keystone, Glance, Nova, Neutron, Horizon and Heat.

Then using https://docs.openstack.org/magnum/latest/install/index.html, followed Magnum installation.
When I arrived at "Verifying operation", and using
"$ magnum service-list",
I got:

+----+------+------------------+-------+----------+-----------------+---------------------------+---------------------------+
| id | host | binary | state | disabled | disabled_reason | created_at | updated_at |
+----+------+------------------+-------+----------+-----------------+---------------------------+---------------------------+
| 1 | - | magnum-conductor | up | | - | 2018-01-16T09:33:11+00:00 | 2018-01-16T09:33:11+00:00 |
| 2 | - | magnum-conductor | up | | - | 2018-01-16T09:33:11+00:00 | 2018-01-16T09:33:11+00:00 |
| 3 | - | magnum-conductor | up | | - | 2018-01-16T09:33:11+00:00 | 2018-01-16T09:33:11+00:00 |
+----+------+------------------+-------+----------+-----------------+---------------------------+---------------------------+

According to the documentation, only one magnum-compute service should have appeared, with the host value being "controller"
I have two nodes, "controller" and "compute1".

For another installation I had the same issue, but with only two lines. I uninstalled Magnum and HeaT, reinstalled it, got 2 lines.

Then I checked with
"$ openstack compute service list",
there was a nova-compute service on the controller node. The daemon for nova-compute was down, I restarted it, it disappeared from the list of compute services, went masked and did nothing afterwards.

There, after restarting the Magnum daemon, only one magnum-conductor appeared, with no host.