ceph 对接openstack liberty
Ceph 准备工作
官方文档：http://docs.ceph.com/docs/master/rbd/rbd-openstack/
官方中文文档：http://docs.ceph.org.cn/rbd/rbd-openstack/
环境准备：保证openstack节点的hosts文件里有ceph集群的各个主机名，也要保证ceph集群节点有openstack节点的各个主机名
创建存储池
# ceph osd pool create volumes 128
# ceph osd pool create images 128
# ceph osd pool create backups 128
# ceph osd pool create vms 128
Create Ceph User ceph---为openstack创建ceph用户
如果你启用了 cephx 认证，需要分别为 Nova/Cinder 和 Glance 创建新用户。命令如下：
ceph auth get-or-create client.cinder mon 'allow r' osd 'allow class-read object_prefix rbd_children, allow rwx pool=volumes, allow rwx pool=vms, allow rx pool=images'
ceph auth get-or-create client.glance mon 'allow r' osd 'allow class-read object_prefix rbd_children, allow rwx pool=images'
ceph auth get-or-create client.cinder-backup mon 'allow r' osd 'allow class-read object_prefix rbd_children, allow rwx pool=backups'
每创建一个用户会输出一个对应用户的秘钥环，秘钥环是其他节点访问集群的钥匙,如图：
用户创建完我们可以在ceph集群的mon节点上ceph auth list看下创建的用户是否正确，出现下面图那种，会导致接下来的调用ceph出现权限不正确的报错
报错信息：
例子--{your-glance-api-server}节点：
把 client.cinder 、 client.glance 和 client.cinder-backup 的密钥环复制到适当的节点，并更改所有权：
ceph auth get-or-create client.glance | ssh {your-glance-api-server} sudo tee /etc/ceph/ceph.client.glance.keyring
ceph auth get-or-create client.glance | ssh controller sudo tee /etc/ceph/ceph.client.glance.keyring
ssh controller sudo chown glance:glance /etc/ceph/ceph.client.glance.keyring
也可以登录到{your-glance-api-server}节点，更改秘钥的所有权
注意：必须已经在controller节点上安装过ceph包，也就是要有/etc/ceph这个文件夹，完成后可以在controller下面看到ceph.client.glance.keyring秘钥环
例子--{your-volume-server}：
ceph auth get-or-create client.cinder | ssh {your-volume-server} sudo tee /etc/ceph/ceph.client.cinder.keyring
ceph auth get-or-create client.cinder | ssh computer-1 sudo tee /etc/ceph/ceph.client.cinder.keyring
也可以登录到{your-volume-server}节点，更改秘钥的所有权
注意：必须已经在computer-1节点上安装过ceph包，也就是要有/etc/ceph这个文件夹,完成后可以在computer-1下面看到ceph.client.cinder.keyring秘钥环
运行着 glance-api 、 cinder-volume 、 nova-compute 或 cinder-backup 的主机被当作 Ceph 客户端，它们都需要 ceph.conf 文件，copy user.keyring to glance-api node and cinder-volume node
ceph-deploy# ceph auth get-or-create client.ceph >> ceph.client.ceph.keyring
# scp ceph.client.ceph.keyring ceph.conf controller:/etc/ceph/
# scp ceph.client.ceph.keyring ceph.conf cinder-volume:/etc/ceph/对接glance-api
install rbd
# yum install ceph-common python-rbd
设置key权限
# chown glance:glance /etc/ceph/ceph.client.ceph.keyring
vim /etc/glance/glance-api.conf 添加下面的参数
[DEFAULT]
verbose=True
show_image_direct_url=True
[glance_store]
default_store=rbd
stores = rbd
rbd_store_pool = images
rbd_store_user = glance ////这里的用户是我们上面创建的client.glance 只写glance
rbd_store_ceph_conf = /etc/ceph/ceph.conf
rbd_store_chunk_size = 8
filesystem_store_datadir=/var/lib/glance/images/
注意：网上有的把这个给注释掉了，亲测liberty 注释不注释都是不会在给/var/lib/glance/image下存储镜像了，镜像存在了ceph集群glance pool里了
restart glance service
systemctl restart openstack-glance-api.service
systemctl restart openstack-glance-registry.service
对接cinder-volume
install ceph-common
yum install ceph-common python-rbd
设置key权限
登录到cinder节点，对秘钥进行授权
chown cinder:cinder /etc/ceph/ceph.client.ceph.keyring
vim /etc/cinder/cinder.conf 添加下面的参数
[DEFAULT]
enabled_backends = ceph
[ceph]
volume_driver = cinder.volume.drivers.rbd.RBDDriver
volume_backend_name = ceph
rbd_pool = volumes
rbd_ceph_conf = /etc/ceph/ceph.conf
rbd_flatten_volume_from_snapshot = false
rbd_max_clone_depth = 5
rbd_store_chunk_size = 4
rados_connect_timeout = -1
glance_api_version = 2
rbd_user = cinder ////这里的用户是我们上面创建的client.cinder 只写cinder
rbd_secret_uuid = 457eb676-33da-42ec-9a8c-9293d545c337restart cinder-volume service
# systemctl restart openstack-cinder-volume.service对接compute
install
# yum install ceph-common python-rbdvim /etc/nova/nova.conf 添加下面的参数
[cinder]
os_region_name = RegionOne
[libvirt]
images_type = rbd
images_rbd_pool = vms
images_rbd_ceph_conf = /etc/ceph/ceph.conf
disk_cachemodes="network=writeback"
rbd_user = cinder ////这里的用户是我们上面创建的client.cinder 只写cinder
rbd_secret_uuid = 457eb676-33da-42ec-9a8c-9293d545c337
inject_password = false
inject_key = false
inject_partition = -2
live_migration_flag="VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE,VIR_MIGRATE_PERSIST_DEST,VIR_MIGRATE_TUNNELLED"
hw_disk_discard = unmap从ceph集群复制ceph.conf到控制节点或者计算节点的/etc/ceph/文件夹下并更改所有权
# scp ceph-node:/etc/ceph/ceph.conf /etc/ceph
# chown cinder:cinder /etc/ceph/ceph.conf
设置libvird
# uuidgen ///这里uuid会生成一个新的随机数，我们这里工这个固定的随机数
457eb676-33da-42ec-9a8c-9293d545c337
# cat > secret.xml <<EOF
<secret ephemeral='no' private='no'>
<uuid>457eb676-33da-42ec-9a8c-9293d545c337</uuid>
<usage type='ceph'>
<name>client.cinder secret</name>
</usage>
</secret>
EOF
virsh secret-list ////可以列出我们设定的secret列表
virsh secret-undefine ///可以取消我们定义的secret，其实相当于删除之前的设定的参数
如果提示我们这样的报错：
这是说明我明我们的几点没有开启libvirtd服务
systemctl start libvirtd.service
systemctl status libvirtd.service
# virsh secret-define --file secret.xml ////定义秘钥
Secret 457eb676-33da-42ec-9a8c-9293d545c337 created
# cat /etc/ceph/ceph.client.cinder.keyring
[client.cinder]
key = AQC62PtZIX7TFRAAQJz981zXIvuMoQlRNnrJiQ==
# virsh secret-set-value --secret 457eb676-33da-42ec-9a8c-9293d545c337 --base64 $(cat client.ceph.key)
virsh secret-set-value --secret 457eb676-33da-42ec-9a8c-9293d545c337 --base64 AQC62PtZIX7TFRAAQJz981zXIvuMoQlRNnrJiQ==
Secret value set
为了省事，用下面命令一下即可：
virsh secret-set-value --secret 457eb676-33da-42ec-9a8c-9293d545c337 --base64 $(cat /etc/ceph/ceph.client.cinder.keyring |grep key|awk -F ' ' '{print $3}')
restart nova-compute
systemctl restart openstack-nova-compute.service
至此修改过的文件，对应的服务重启一下
cinder service-list 查看ceph是都up了
