d24a135e14
Change-Id: I0a8a7a7ac7144d3f751c8501b2d35ac847130cfc
229 lines
5.5 KiB
ReStructuredText
229 lines
5.5 KiB
ReStructuredText
.. _external-ceph-guide:
|
|
|
|
=============
|
|
External Ceph
|
|
=============
|
|
|
|
Sometimes it is necessary to connect OpenStack services to an existing Ceph
|
|
cluster instead of deploying it with Kolla. This can be achieved with only a
|
|
few configuration steps in Kolla.
|
|
|
|
Requirements
|
|
============
|
|
|
|
* An existing installation of Ceph
|
|
* Existing Ceph storage pools
|
|
* Existing credentials in Ceph for OpenStack services to connect to Ceph
|
|
(Glance, Cinder, Nova, Gnocchi)
|
|
|
|
Enabling External Ceph
|
|
======================
|
|
|
|
Using external Ceph with Kolla means not to deploy Ceph via Kolla. Therefore,
|
|
disable Ceph deployment in ``/etc/kolla/globals.yml``
|
|
|
|
::
|
|
|
|
enable_ceph: "no"
|
|
|
|
There are flags indicating individual services to use ceph or not which default
|
|
to the value of ``enable_ceph``. Those flags now need to be activated in order
|
|
to activate external Ceph integration. This can be done individually per
|
|
service in ``/etc/kolla/globals.yml``:
|
|
|
|
::
|
|
|
|
glance_backend_ceph: "yes"
|
|
cinder_backend_ceph: "yes"
|
|
nova_backend_ceph: "yes"
|
|
gnocchi_backend_storage: "ceph"
|
|
|
|
The combination of ``enable_ceph: "no"`` and ``<service>_backend_ceph: "yes"``
|
|
triggers the activation of external ceph mechanism in Kolla.
|
|
|
|
Configuring External Ceph
|
|
=========================
|
|
|
|
Glance
|
|
------
|
|
|
|
Configuring Glance for Ceph includes three steps:
|
|
|
|
1) Configure RBD back end in glance-api.conf
|
|
2) Create Ceph configuration file in /etc/ceph/ceph.conf
|
|
3) Create Ceph keyring file in /etc/ceph/ceph.client.<username>.keyring
|
|
|
|
Step 1 is done by using Kolla's INI merge mechanism: Create a file in
|
|
``/etc/kolla/config/glance/glance-api.conf`` with the following contents:
|
|
|
|
::
|
|
|
|
[glance_store]
|
|
stores = rbd
|
|
default_store = rbd
|
|
rbd_store_pool = images
|
|
rbd_store_user = glance
|
|
rbd_store_ceph_conf = /etc/ceph/ceph.conf
|
|
|
|
Now put ceph.conf and the keyring file (name depends on the username created in
|
|
Ceph) into the same directory, for example:
|
|
|
|
/etc/kolla/config/glance/ceph.conf
|
|
|
|
::
|
|
|
|
[global]
|
|
fsid = 1d89fec3-325a-4963-a950-c4afedd37fe3
|
|
mon_initial_members = ceph-0
|
|
mon_host = 192.168.0.56
|
|
auth_cluster_required = cephx
|
|
auth_service_required = cephx
|
|
auth_client_required = cephx
|
|
|
|
/etc/kolla/config/glance/ceph.client.glance.keyring
|
|
|
|
::
|
|
|
|
[client.glance]
|
|
key = AQAg5YRXS0qxLRAAXe6a4R1a15AoRx7ft80DhA==
|
|
|
|
Kolla will pick up all files named ceph.* in this directory an copy them to the
|
|
/etc/ceph/ directory of the container.
|
|
|
|
Cinder
|
|
------
|
|
|
|
Configuring external Ceph for Cinder works very similar to
|
|
Glance.
|
|
|
|
Edit /etc/kolla/config/cinder/cinder-volume.conf with the following content:
|
|
|
|
::
|
|
|
|
[DEFAULT]
|
|
enabled_backends=rbd-1
|
|
|
|
[rbd-1]
|
|
rbd_ceph_conf=/etc/ceph/ceph.conf
|
|
rbd_user=cinder
|
|
backend_host=rbd:volumes
|
|
rbd_pool=volumes
|
|
volume_backend_name=rbd-1
|
|
volume_driver=cinder.volume.drivers.rbd.RBDDriver
|
|
rbd_secret_uuid = {{ cinder_rbd_secret_uuid }}
|
|
|
|
.. note::
|
|
|
|
``cinder_rbd_secret_uuid`` can be found in ``/etc/kolla/passwords.yml`` file.
|
|
|
|
Edit /etc/kolla/config/cinder/cinder-backup.conf with the following content:
|
|
|
|
::
|
|
|
|
[DEFAULT]
|
|
backup_ceph_conf=/etc/ceph/ceph.conf
|
|
backup_ceph_user=cinder-backup
|
|
backup_ceph_chunk_size = 134217728
|
|
backup_ceph_pool=backups
|
|
backup_driver = cinder.backup.drivers.ceph
|
|
backup_ceph_stripe_unit = 0
|
|
backup_ceph_stripe_count = 0
|
|
restore_discard_excess_bytes = true
|
|
|
|
Next, place the ceph.conf file into
|
|
/etc/kolla/config/cinder/ceph.conf:
|
|
|
|
::
|
|
|
|
[global]
|
|
fsid = 1d89fec3-325a-4963-a950-c4afedd37fe3
|
|
mon_initial_members = ceph-0
|
|
mon_host = 192.168.0.56
|
|
auth_cluster_required = cephx
|
|
auth_service_required = cephx
|
|
auth_client_required = cephx
|
|
|
|
Separate configuration options can be configured for
|
|
cinder-volume and cinder-backup by adding ceph.conf files to
|
|
/etc/kolla/config/cinder/cinder-volume and
|
|
/etc/kolla/config/cinder/cinder-backup respectively. They
|
|
will be merged with /etc/kolla/config/cinder/ceph.conf.
|
|
|
|
Ceph keyrings are deployed per service and placed into
|
|
cinder-volume and cinder-backup directories, put the keyring files
|
|
to these directories, for example:
|
|
|
|
.. note::
|
|
|
|
``cinder-backup`` requires two keyrings for accessing volumes
|
|
and backup pool.
|
|
|
|
/etc/kolla/config/cinder/cinder-backup/ceph.client.cinder.keyring
|
|
|
|
::
|
|
|
|
[client.cinder]
|
|
key = AQAg5YRXpChaGRAAlTSCleesthCRmCYrfQVX1w==
|
|
|
|
/etc/kolla/config/cinder/cinder-backup/ceph.client.cinder-backup.keyring
|
|
|
|
::
|
|
|
|
[client.cinder-backup]
|
|
key = AQC9wNBYrD8MOBAAwUlCdPKxWZlhkrWIDE1J/w==
|
|
|
|
/etc/kolla/config/cinder/cinder-volume/ceph.client.cinder.keyring
|
|
|
|
::
|
|
|
|
[client.cinder]
|
|
key = AQAg5YRXpChaGRAAlTSCleesthCRmCYrfQVX1w==
|
|
|
|
It is important that the files are named ceph.client*.
|
|
|
|
Nova
|
|
------
|
|
|
|
Put ceph.conf, nova client keyring file and cinder client keyring file into
|
|
``/etc/kolla/config/nova``:
|
|
|
|
::
|
|
|
|
$ ls /etc/kolla/config/nova
|
|
ceph.client.cinder.keyring ceph.client.nova.keyring ceph.conf
|
|
|
|
Configure nova-compute to use Ceph as the ephemeral back end by creating
|
|
``/etc/kolla/config/nova/nova-compute.conf`` and adding the following
|
|
contents:
|
|
|
|
::
|
|
|
|
[libvirt]
|
|
images_rbd_pool=vms
|
|
images_type=rbd
|
|
images_rbd_ceph_conf=/etc/ceph/ceph.conf
|
|
rbd_user=nova
|
|
|
|
.. note:: ``rbd_user`` might vary depending on your environment.
|
|
|
|
Gnocchi
|
|
-------
|
|
|
|
Edit ``/etc/kolla/config/gnocchi/gnocchi.conf`` with the following content:
|
|
|
|
::
|
|
|
|
[storage]
|
|
driver = ceph
|
|
ceph_username = gnocchi
|
|
ceph_keyring = /etc/ceph/ceph.client.gnocchi.keyring
|
|
ceph_conffile = /etc/ceph/ceph.conf
|
|
|
|
Put ceph.conf and gnocchi client keyring file in
|
|
``/etc/kolla/config/gnocchi``:
|
|
|
|
::
|
|
|
|
$ ls /etc/kolla/config/gnocchi
|
|
ceph.client.gnocchi.keyring ceph.conf gnocchi.conf
|