keystone: error 500 when creating identity endpoint

Hello

When creating the identity endpoint following the guide http://docs.openstack.org/juno/install-guide/install/apt/content/keystone-services.html, I get a "An unexpected error prevented the server from fulfilling your request. (HTTP 500)" error. My cloud design runs openstack (Juno) over 3 Virtual Machines (Ubuntu server 14.04), but at that point (keystone install and setup) I am only working on the controller node for the moment.

openstack@controller:~$ more source.src
    export OS_SERVICE_TOKEN=f000c6975f9c93d5cb5e
    export OS_SERVICE_ENDPOINT=http://controller:35357/v2.0
    openstack@controller:~$ source source.src
    openstack@controller:~$ keystone --debug endpoint-create --service-id fcb0d0f94e19474fad673041534a902c --publicurl http://controller:5000/v2.0 --internalurl http://controller:5000/v2.0 --adminurl http://controller:35357/v2.0 --region nantes
    DEBUG:keystoneclient.session:REQ: curl -i -X GET http://controller:35357/v2.0/OS-KSADM/services/fcb0d0f94e19474fad673041534a902c -H "User-Agent: python-keystoneclient" -H "X-Auth-Token: f000c6975f9c93d5cb5e"
    INFO:urllib3.connectionpool:Starting new HTTP connection (1): controller
    DEBUG:urllib3.connectionpool:Setting read timeout to 600.0
    DEBUG:urllib3.connectionpool:"GET /v2.0/OS-KSADM/services/fcb0d0f94e19474fad673041534a902c HTTP/1.1" 200 158
    DEBUG:keystoneclient.session:RESP: [200] {'date': 'Tue, 09 Jun 2015 20:42:02 GMT', 'vary': 'X-Auth-Token', 'content-length': '158', 'content-type': 'application/json', 'x-distribution': 'Ubuntu'}
    RESP BODY: {"OS-KSADM:service": {"id": "fcb0d0f94e19474fad673041534a902c", "enabled": true, "type": "identity", "name": "keystone", "description": "OpenStack Identity"}}

    DEBUG:keystoneclient.session:REQ: curl -i -X POST http://controller:35357/v2.0/endpoints -H "User-Agent: python-keystoneclient" -H "Content-Type: application/json" -H "X-Auth-Token: f000c6975f9c93d5cb5e" -d '{"endpoint": {"adminurl": "http://controller:35357/v2.0", "service_id": "fcb0d0f94e19474fad673041534a902c", "region": "nantes", "internalurl": "http://controller:5000/v2.0", "publicurl": "http://controller:5000/v2.0"}}'
    INFO:urllib3.connectionpool:Starting new HTTP connection (1): controller
    DEBUG:urllib3.connectionpool:Setting read timeout to 600.0
    DEBUG:urllib3.connectionpool:"POST /v2.0/endpoints HTTP/1.1" 500 143
    DEBUG:keystoneclient.session:RESP:
    DEBUG:keystoneclient.session:Request returned failure status: 500
    An unexpected error prevented the server from fulfilling your request. (HTTP 500)
    openstack@controller:~$
    openstack@controller:~$
    openstack@controller:~$ netstat -an | grep -i listen
    tcp 0 0 10.0.2.15:3306 0.0.0.0:* LISTEN
    tcp 0 0 127.0.0.1:11211 0.0.0.0:* LISTEN
    tcp 0 0 192.168.122.1:53 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:35357 0.0.0.0:* LISTEN
    tcp 0 0 0.0.0.0:5000 0.0.0.0:* LISTEN
    tcp6 0 0 :::80 :::* LISTEN
    tcp6 0 0 :::22 :::* LISTEN
    unix 2 [ ACC ] STREAM LISTENING 11817 /var/run/libvirt/libvirt-sock
    unix 2 [ ACC ] STREAM LISTENING 11819 /var/run/libvirt/libvirt-sock-ro
    unix 2 [ ACC ] STREAM LISTENING 9263 /var/run/dbus/system_bus_socket
    unix 2 [ ACC ] STREAM LISTENING 8269 @/com/ubuntu/upstart
    unix 2 [ ACC ] STREAM LISTENING 11913 /var/run/mysqld/mysqld.sock
    unix 2 [ ACC ] SEQPACKET LISTENING 8584 /run/udev/control
    unix 2 [ ACC ] STREAM LISTENING 9822 @ISCSIADM_ABSTRACT_NAMESPACE
    unix 2 [ ACC ] STREAM LISTENING 10441 /var/run/acpid.socket

    openstack@controller:~$ more /var/log/keystone/keystone.conf
    /var/log/keystone/keystone.conf: Permission non accordée
    openstack@controller:~$ sudo more /var/log/keystone/keystone.conf
    /var/log/keystone/keystone.conf: Aucun fichier ou dossier de ce type
    openstack@controller:~$ sudo cat /var/log/keystone/keystone.conf
    cat: /var/log/keystone/keystone.conf: Aucun fichier ou dossier de ce type
    openstack@controller:~$ sudo ls /var/log/keystone/
    openstack@controller:~$

    openstack@controller:~$ dmesg | tail
    [ 20.757621] init: mongodb main process (1168) terminated with status 100
    [ 23.891161] Ebtables v2.0 registered
    [ 24.085109] ip_tables: (C) 2000-2006 Netfilter Core Team
    [ 24.184411] ip6_tables: (C) 2000-2006 Netfilter Core Team
    [ 32.976051] init: plymouth-upstart-bridge main process (150) killed by TERM signal
    [ 45.127989] Bridge firewalling registered
    [ 45.297645] nf_conntrack version 0.5.0 (16384 buckets, 65536 max)
    [ 45.345844] IPv6: ADDRCONF(NETDEV_UP): virbr0: link is not ready
    [ 57.975301] cgroup: systemd-logind (652) created nested cgroup for controller "memory" which has incomplete hierarchy support. Nested cgroups may change behavior in the future.
    [ 57.975304] cgroup: "memory" requires setting use_hierarchy to 1 on the root

I tried to uninstall/reinstall keystone with the commands sudo apt-get remove and sudo apt-get install.

As you can see, the keystone logfile does not exist. When entering into mariadb, with sql commands into the keystone database, I can see the "service" table has one record, and the user table has two. Does that mean the keystone db is correctly synchronized?

I have also tried to unset $OS_SERVICE_TOKEN and $OS_SERVICE_ENDPOINT, as suggested in another thread, without success.

Thank you in advance for your help, I am totally stuck here.

Pirlouit