Multiple store locations for Glance images

--原文連接http://egonzalez.org/multiple-store-locations-for-glance-images/

First we need to create the directories where hard disks are going to be mounted

sudo mkdir /var/lib/glance/lvm-images
sudo mkdir /var/lib/glance/extended-images

Next, we mount the devices at the directories created in the previous step

sudo mount /dev/sdc1 /var/lib/glance/lvm-images/
sudo mount /dev/sdd1 /var/lib/glance/extended-images/

An important step is making the glance user the owner of that directories

chown glance:glance /var/lib/glance/lvm-images/
chown glance:glance /var/lib/glance/extended-images/

Once the previous steps has been made, we need to configure the /etc/glance/glance-api.conf file. In this file, we’re going to configure glance to use multiple directories to store images. We search the section 「Filesystem Store Options」 and modify/create the following: We will leave the option 「filesystem_store_datadir=」 empty, if we comment this option, glance will use it as default store location and will show us an error during image creation. And we add the option 「filesystem_store_datadirs」, once for any directory we created in previous steps. We can use priorities on glance, priority 200 has precedence over priority 100, if we don’t specify any priority, default will be 0

# ============ Filesystem Store Options ========================
filesystem_store_datadir=
filesystem_store_datadirs=/var/lib/glance/images
filesystem_store_datadirs=/var/lib/glance/lvm-images:200
filesystem_store_datadirs=/var/lib/glance/extended-images:100

Once we have configured glance-api.conf, restart glance-api service

systemctl restart openstack-glance-api

Now we’re going to create an image

glance image-create --name CirrosDatadir --file ~/Images/cirros-0.3.4-i386-disk.img --disk-format qcow2 --container-format bare --progress
[=============================>] 100%
+------------------+--------------------------------------+
| Property         | Value                                |
+------------------+--------------------------------------+
| checksum         | 79b4436412283bb63c2cba4ac796bcd9     |
| container_format | bare                                 |
| created_at       | 2015-08-13T11:34:00.000000           |
| deleted          | False                                |
| deleted_at       | None                                 |
| disk_format      | qcow2                                |
| id               | 6ac8f5b9-5863-46ca-bb04-db352d35d829 |
| is_public        | False                                |
| min_disk         | 0                                    |
| min_ram          | 0                                    |
| name             | CirrosDatadir                        |
| owner            | 738ec25d8b9c41f9b0cf84ce25730e92     |
| protected        | False                                |
| size             | 12506112                             |
| status           | active                               |
| updated_at       | 2015-08-13T11:34:09.000000           |
| virtual_size     | None                                 |
+------------------+--------------------------------------+