OpenStack 使用Ceph 配置指导
概述Ceph 作为分布式文件系统，不但具有高可靠性、高扩展性、高性能。 也是统一存储系统。支持对象存储、块存储、文件存储，本文介绍怎样使用Ceph 块存储作为OpenStack的Glance、Nova、Cinder组件的后端存储
前面已经分享过ceph 集群的部署，以下怎样让openstack在glance、cinder、nova组件后端配置使用ceph来进行存储
參考文档
http://docs.ceph.com/docs/master/rbd/rbd-openstack/
http://docs.openfans.org/ceph/ceph4e2d658765876863/ceph-1/copy_of_ceph-block-device3010ceph57578bbe59073011/openstack301057578bbe59077684openstack3011#u
环境信息
192.168.3.8 ceph node1（部署mon,mds）
192.168.3.9 ceph node2（部署osd)
192.168.3.10 ceph node3 (部署osd)
192.168.3.4 openstack （devstack 部署，包含 controller, network,compute)
说明
ceph 不支持qcow2格式的镜像。所以假设配置nova部分假设要启动虚拟机在ceph ，镜像必须是raw
配置glance
配置认证
1. 将node1节点/etc/ceph文件夹下的两个文件复制到openstack 的 controller节点和compute节点（我这里都在一个节点）
cd /etc/ceph/
scp ceph.conf ceph.client.admin.keyring 192.168.3.4:/etc/ceph/
2. 改动ceph.client.admin.keyring的权限
chmod +r /etc/ceph/ceph.client.admin.keyring
3. 在ceph148上创建glance的存储池
rados mkpool glance
4. 编辑openstack上glance的配置文件/etc/glance/glance-api.conf中例如以下配置项
rbd_store_ceph_conf = /etc/ceph/ceph.conf
stores = rbd (L 曾经版本号不须要这个)
default_store = rbd
rbd_store_user = admin(这里的username是上面cephx认证的用户)
rbd_store_pool = glance
rbd_store_chunk_size = 8
6,重新启动glance-api 服务
7,上传一个镜像
stack@map-VirtualBox:~/devstack$ glance image-create --name "cirros-0.3.2-x86_64-10" --disk-format qcow2 --container-format bare <./files/images/cirros-0.3.4-x86_64-uec/cirros-0.3.4-x86_64-blank.img
+------------------+--------------------------------------+
| Property | Value |
+------------------+--------------------------------------+
| checksum | eb9139e4942121f22bbc2afc0400b2a4 |
| container_format | bare |
| created_at | 2016-02-02T06:45:09Z |
| disk_format | qcow2 |
| id | 5d57ba01-a905-42b6-bc9b-39a10b8c7fcb |
| min_disk | 0 |
| min_ram | 0 |
| name | cirros-0.3.2-x86_64-10 |
| owner | bffb0c753d004509b0ef6ae9bd4777ba |
| protected | False |
| size | 25165824 |
| status | active |
| tags | [] |
| updated_at | 2016-02-02T06:45:19Z |
| virtual_size | None |
| visibility | private |
+------------------+--------------------------------------+
8，查看ceph 池中的对象。刚上传的镜像已经到ceph池
root@map-VirtualBox:/etc/glance# rbd ls images
5d57ba01-a905-42b6-bc9b-39a10b8c7fcb
root@map-VirtualBox:/etc/glance#
9,查看 image 池中占用情况
root@map-VirtualBox:~# rados df
pool name category KB objects clones degraded unfound rd rd KB wr wr KB
cephfs_data - 0 0 0 0 0 0 0 0 0
cephfs_metadata - 0 0 0 0 0 0 0 0 0
data - 0 0 0 0 0 0 0 0 0
<span>images - 24577 6 0 0 0 113 87 20 24577</span>
metadata - 2 20 0 0 0 6 5 31 8
nova - 0 0 0 0 0 0 0 0 0
rbd - 0 0 0 0 0 0 0 0 0
test - 137633 46 0 0 0 287 1110 642 132406
vms - 0 1 0 0 0 308 598 1572 43931
volumes - 0 0 0 0 0 0 0 0 0
total used 10891912 73
total avail 5085560
total space 15977472
配置nova 1,创建nova pool
rados mkpool vms
root@map-VirtualBox:/etc/nova# rados mkpool nova
successfully created pool nova
root@map-VirtualBox:/etc/nova# rados lspools
data
metadata
rbd
cephfs_data
cephfs_metadata
test
volumes
images
vms
nova2,生成uuid
root@map-VirtualBox:/etc/nova# uuidgen
ebdba075-59bc-4408-9a2c-d44b16d56bd3
3,创建screen
root@map-VirtualBox:/etc/nova# cat > secret.xml <<EOF
> <secret ephemeral='no' private='no'>
> <uuid>ebdba075-59bc-4408-9a2c-d44b16d56bd3</uuid>
> <usage type='ceph'>
> <name>client.admin secret</name>
> </usage>
> </secret>
> EOF4,运行virsh secret-define --file secret.xml
root@map-VirtualBox:/etc/nova# virsh secret-define --file secret.xml
Secret ebdba075-59bc-4408-9a2c-d44b16d56bd3 created5,运行例如以下命令，设置
root@map-VirtualBox:/etc/nova# cat /etc/ceph/ceph.client.admin.keyring
key = AQDPoZRWcIQCDhAAwGapOCdp2uql2HJN2HpD9w==
root@map-VirtualBox:/etc/nova# echo "AQDPoZRWcIQCDhAAwGapOCdp2uql2HJN2HpD9w==">key
root@map-VirtualBox:/etc/nova# virsh secret-set-value --secret ebdba075-59bc-4408-9a2c-d44b16d56bd3 --base64 $(cat key)
Secret value set
查看secret验证配置是否正确
root@map-VirtualBox:~# virsh secret-define
error: command 'secret-define' requires <file> option
root@map-VirtualBox:~# virsh secret-list
UUID Usage
--------------------------------------------------------------------------------
ebdba075-59bc-4408-9a2c-d44b16d56bd3ceph client.admin secret
root@map-VirtualBox:~# virsh secret-dumpxml ebdba075-59bc-4408-9a2c-d44b16d56bd3
<secret ephemeral='no' private='no'>
<uuid>ebdba075-59bc-4408-9a2c-d44b16d56bd3</uuid>
<usage type='ceph'>
<name>client.admin secret</name>
</usage>
</secret>
root@map-VirtualBox:~#
6,配置nova.conf
先备份nova.conf
root@map-VirtualBox:/etc/nova# ls
api-paste.inikeynova.confpolicy.jsonrootwrap.confrootwrap.dsecret.xml
root@map-VirtualBox:/etc/nova# cp nova.conf nova.conf.bak编辑nova.conf 中例如以下内容 images_type=rbd
images_rbd_pool=vms
images_rbd_ceph_conf=/etc/ceph/ceph.conf
rbd_user=admin
rbd_secret_uuid=ebdba075-59bc-4408-9a2c-d44b16d56bd3
cpu_mode=none
7,重新启动nova-compute
8,创建一个虚拟机
9，查看ceph 池中的对象，刚创建的虚拟机已经到ceph池
root@map-VirtualBox:/etc/cinder# rados df
pool name category KB objects clones degraded unfound rd rd KB wr wr KB
cephfs_data - 0 0 0 0 0 0 0 0 0
cephfs_metadata - 0 0 0 0 0 0 0 0 0
data - 0 0 0 0 0 0 0 0 0
images - 49153 11 0 0 0 269 24785 40 49154
metadata - 2 20 0 0 0 6 5 31 8
nova - 0 0 0 0 0 0 0 0 0
rbd - 0 0 0 0 0 0 0 0 0
test - 137633 46 0 0 0 287 1110 642 132406
<span>vms - 37455 20 0 0 0 491 919 2400 78635</span>
volumes - 0 0 0 0 0 0 0 0 0
total used 10990976 97
total avail 4986496
total space 15977472
root@map-VirtualBox:/etc/cinder# rbd ls vms
06aedb93-087f-4110-9d18-8428aa9ede29_disk
06aedb93-087f-4110-9d18-8428aa9ede29_disk.config
2a1ef5e0-97ee-4c41-8ad9-f253d019c5d2_disk
2a1ef5e0-97ee-4c41-8ad9-f253d019c5d2_disk.config
root@map-VirtualBox:/etc/cinder#
stack@map-VirtualBox:~/devstack$ nova list
+--------------------------------------+------+---------+------------+-------------+------------------+
| ID | Name | Status| Task State | Power State | Networks |
+--------------------------------------+------+---------+------------+-------------+------------------+
| 06aedb93-087f-4110-9d18-8428aa9ede29 | sdf| ACTIVE| - | Running | private=10.0.0.3 |
| 2a1ef5e0-97ee-4c41-8ad9-f253d019c5d2 | we | SHUTOFF | - | Shutdown | private=10.0.0.2 |
+--------------------------------------+------+---------+------------+-------------+------------------+
stack@map-VirtualBox:~/devstack$
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