1. 需求說明

? ?glance作為openstack中p_w_picpath服務(wù)，支持多種適配器，支持將p_w_picpath存放到本地文件系統(tǒng)，http服務(wù)器，ceph分布式文件系統(tǒng)，glusterfs和sleepdog等開源的分布式文件系統(tǒng)上，本文，通過將講述glance如何和ceph結(jié)合。

? ?目前glance采用的是本地filesystem的方式存儲，存放在默認(rèn)的路徑/var/lib/glance/p_w_picpaths下，當(dāng)把本地的文件系統(tǒng)修改為分布式的文件系統(tǒng)ceph之后，原本在系統(tǒng)中鏡像將無法使用，所以建議當(dāng)前的鏡像刪除，部署好ceph之后，再統(tǒng)一上傳至ceph中存儲。

2.原理解析

? ?使用ceph的rbd接口，需要通過libvirt，所以需要在客戶端機器上安裝libvirt和qemu，關(guān)于ceph和openstack結(jié)合的結(jié)構(gòu)如下，同時，在openstack中，需要用到存儲的地方有三個:1. glance的鏡像，默認(rèn)的本地存儲，路徑在/var/lib/glance/p_w_picpaths目錄下，2. nova虛擬機存儲，默認(rèn)本地，路徑位于/var/lib/nova/instances目錄下，3. cinder存儲，默認(rèn)采用LVM的存儲方式。

3. glance與ceph聯(lián)動

1.創(chuàng)建資源池pool

1、ceph默認(rèn)創(chuàng)建了一個pool:rbd [root@controller_10_1_2_230?~]#?ceph?osd?lspools 0?rbd,[root@controller_10_1_2_230?~]#?ceph?osd?pool?stats pool?rbd?id?0nothing?is?going?on2、創(chuàng)建一個pool，指定pg_num的大小為128 [root@controller_10_1_2_230?~]#?ceph?osd?pool?create?p_w_picpaths?128 pool?'p_w_picpaths'?created3、查看pool的pg_num和pgp_num大小 [root@controller_10_1_2_230?~]#?ceph?osd?pool?get?p_w_picpaths?pg_num pg_num:?128 [root@controller_10_1_2_230?~]#?ceph?osd?pool?get?p_w_picpaths?pgp_num pgp_num:?1284、查看ceph中的pools [root@controller_10_1_2_230?~]#?ceph?osd?lspools 0?rbd,1?p_w_picpaths,???????????? [root@controller_10_1_2_230?~]#?ceph?osd?pool?stats pool?rbd?id?0nothing?is?going?onpool?p_w_picpaths?id?1????????????????#增加了一個pool，id號碼是1nothing?is?going?on

2.配置ceph客戶端

1.?glance作為ceph的客戶端，即glance-api，需要有ceph的配置文件，從ceph的monitor節(jié)點復(fù)制一份配置文件過去即可，我所在環(huán)境中控制節(jié)點和ceph?monitor為同一臺機器，不需要操作#如果controller節(jié)點和ceph的monitor節(jié)點是分開，則需要復(fù)制 [root@controller_10_1_2_230?~]#?scp?/etc/ceph/ceph.conf?root@controller_10_1_2_230:/etc/ceph/ ceph.conf??2.?安裝客戶端rpm包[root@controller_10_1_2_230?~]#?yum?install?python-rbd?-y

3.配置ceph認(rèn)證

1.?添加認(rèn)證的key [root@controller_10_1_2_230?~]#?ceph?auth?get-or-create?client.glance?mon?'allow?r'?osd?'class-read?object_prefix?rbd_children,allow?rwx?pool=p_w_picpaths'??? [client.glance]key?=?AQB526lWOOIQBxAA0ZSk30DBShtti3fKkm4aeA==2.?查看認(rèn)證列表 [root@controller_10_1_2_230?~]#?ceph?auth?list installed?auth?entries:osd.0key:?AQDsx6lWYGehDxAAGwcYP9jDvH2Zaa8JlGwj1Q==caps:?[mon]?allow?profile?osdcaps:?[osd]?allow?* osd.1key:?AQD1x6lWQCYBERAAjIKO1LVpj8FvVefDvNQZSA==caps:?[mon]?allow?profile?osdcaps:?[osd]?allow?* client.adminkey:?AQCexqlWQL6OGBAA2v5LsYEB5VgLyq/K2huY3A==caps:?[mds]?allowcaps:?[mon]?allow?*caps:?[osd]?allow?* client.bootstrap-mdskey:?AQCexqlWUMNRMRAAZEp/UlhQuaixMcNy5d5pPw==caps:?[mon]?allow?profile?bootstrap-mds client.bootstrap-osdkey:?AQCexqlWQFfpJBAAfPCx4sTLNztBESyFKys9LQ==caps:?[mon]?allow?profile?bootstrap-osd client.glance?????????????????????????????????????????????#glance連接ceph的認(rèn)證信息key:?AQB526lWOOIQBxAA0ZSk30DBShtti3fKkm4aeA==caps:?[mon]?allow?rcaps:?[osd]?class-read?object_prefix?rbd_children,allow?rwx?pool=p_w_picpaths?3.?將glance生成的key拷貝至 [root@controller_10_1_2_230?~]#?ceph?auth?get-or-create?client.glance [client.glance]key?=?AQB526lWOOIQBxAA0ZSk30DBShtti3fKkm4aeA==#將key導(dǎo)出到客戶端?????????????? [root@controller_10_1_2_230?~]#?ceph?auth?get-or-create?client.glance?|?tee?/etc/ceph/ceph.client.glance.keyring [client.glance]key?=?AQB526lWOOIQBxAA0ZSk30DBShtti3fKkm4aeA== [root@controller_10_1_2_230?~]#?chown?glance:glance?/etc/ceph/ceph.client.glance.keyring? [root@controller_10_1_2_230?~]#?ll?/etc/ceph/ceph.client.glance.keyring? -rw-r--r--?1?glance?glance?64?Jan?28?17:17?/etc/ceph/ceph.client.glance.keyring

4. 配置glance使用ceph做為后端存儲

1、備份glance-api的配置文件，以便于恢復(fù) [root@controller_10_1_2_230?~]#?cp?/etc/glance/glance-api.conf?/etc/glance/glance-api.conf.orig2、修改glance配置文件，連接至ceph [root@controller_10_1_2_230?~]#?vim?/etc/glance/glance-api.conf [DEFAULT] notification_driver?=?messaging rabbit_hosts?=?10.1.2.230:5672 rabbit_retry_interval?=?1 rabbit_retry_backoff?=?2 rabbit_max_retries?=?0 rabbit_ha_queues?=?True rabbit_durable_queues?=?False rabbit_userid?=?glance rabbit_password?=?GLANCE_MQPASS rabbit_virtual_host?=?/glancedefault_store=rbd?????????????#glance使用的后端存儲 known_stores=glance.store.rbd.Store??????#配置rbd的驅(qū)動rbd_store_ceph_conf=/etc/ceph/ceph.conf????#ceph的配置文件，包含有monitor的地址，通過查找monitor，可以獲取認(rèn)證信息 rbd_store_user=glance??????????????????????#認(rèn)證用戶，即是剛創(chuàng)建的用戶 rbd_store_pool=p_w_picpaths??????????????????????#連接的存儲池 rbd_store_chunk_size=8?????????????????????#設(shè)置chunk?size，即切割的大小3.?重啟glance服務(wù) [root@controller_10_1_2_230?~]#?/etc/init.d/openstack-glance-api?restart????????????????? Stopping?openstack-glance-api:?????????????????????????????[??OK??] Starting?openstack-glance-api:?????????????????????????????[??OK??] [root@controller_10_1_2_230?~]#?/etc/init.d/openstack-glance-registry?restart Stopping?openstack-glance-registry:????????????????????????[??OK??] Starting?openstack-glance-registry:????????????????????????[??OK??] [root@controller_10_1_2_230?~]#?tail?-2?/etc/glance/glance-api.conf #?location?strategy?defined?by?the?'location_strategy'?config?option. #store_type_preference?= [root@controller_10_1_2_230?~]#?tail?-2?/var/log/glance/registry.log 2016-01-28?18:40:25.231?21890?INFO?glance.wsgi.server?[-]?Started?child?21896 2016-01-28?18:40:25.232?21896?INFO?glance.wsgi.server?[-]?(21896)?wsgi?starting?up?on?http://0.0.0.0:9191/

5. 測試glance和ceph聯(lián)動情況

[root@controller_10_1_2_230?~]#?glance?--debug?p_w_picpath-create?--name?glance_ceph_test?--disk-format?qcow2??--container-format?bare??--file??cirros-0.3.3-x86_64-disk.img???? curl?-i?-X?POST?-H?'x-p_w_picpath-meta-container_format:?bare'?-H?'Transfer-Encoding:?chunked'?-H?'User-Agent:?python-glanceclient'?-H?'x-p_w_picpath-meta-size:?13200896'?-H?'x-p_w_picpath-meta-is_public:?False'?-H?'X-Auth-Token:?062af9027a85487997d176c9f1e963f2'?-H?'Content-Type:?application/octet-stream'?-H?'x-p_w_picpath-meta-disk_format:?qcow2'?-H?'x-p_w_picpath-meta-name:?glance_ceph_test'?-d?'<open?file?u'cirros-0.3.3-x86_64-disk.img',?mode?'rb'?at?0x1ba24b0>'?http://controller:9292/v1/p_w_picpathsHTTP/1.1?201?Created content-length:?489 etag:?133eae9fb1c98f45894a4e60d8736619 location:?http://controller:9292/v1/p_w_picpaths/348a90e8-3631-4a66-a45d-590ec6413e7d date:?Thu,?28?Jan?2016?10:42:06?GMT content-type:?application/json x-openstack-request-id:?req-b993bc0b-447e-49b4-a8ce-bd7765199d5a{"p_w_picpath":?{"status":?"active",?"deleted":?false,?"container_format":?"bare",?"min_ram":?0,?"updated_at":?"2016-01-28T10:42:06",?"owner":?"ef4b83a909dc4689b663ff2c70022478",?"min_disk":?0,?"is_public":?false,?"deleted_at":?null,?"id":?"348a90e8-3631-4a66-a45d-590ec6413e7d",?"size":?13200896,?"virtual_size":?null,?"name":?"glance_ceph_test",?"checksum":?"133eae9fb1c98f45894a4e60d8736619",?"created_at":?"2016-01-28T10:42:04",?"disk_format":?"qcow2",?"properties":?{},?"protected":?false}}+------------------+--------------------------------------+ |?Property?????????|?Value????????????????????????????????| +------------------+--------------------------------------+ |?checksum?????????|?133eae9fb1c98f45894a4e60d8736619?????| |?container_format?|?bare?????????????????????????????????| |?created_at???????|?2016-01-28T10:42:04??????????????????| |?deleted??????????|?False????????????????????????????????| |?deleted_at???????|?None?????????????????????????????????| |?disk_format??????|?qcow2????????????????????????????????| |?id???????????????|?348a90e8-3631-4a66-a45d-590ec6413e7d?| |?is_public????????|?False????????????????????????????????| |?min_disk?????????|?0????????????????????????????????????| |?min_ram??????????|?0????????????????????????????????????| |?name?????????????|?glance_ceph_test?????????????????????| |?owner????????????|?ef4b83a909dc4689b663ff2c70022478?????| |?protected????????|?False????????????????????????????????| |?size?????????????|?13200896?????????????????????????????| |?status???????????|?active???????????????????????????????| |?updated_at???????|?2016-01-28T10:42:06??????????????????| |?virtual_size?????|?None?????????????????????????????????| +------------------+--------------------------------------+[root@controller_10_1_2_230?~]#?glance?p_w_picpath-list +--------------------------------------+---------------------+-------------+------------------+----------+--------+ |?ID???????????????????????????????????|?Name????????????????|?Disk?Format?|?Container?Format?|?Size?????|?Status?| +--------------------------------------+---------------------+-------------+------------------+----------+--------+ |?56e96957-1308-45c7-9c66-1afff680b217?|?cirros-0.3.3-x86_64?|?qcow2???????|?bare?????????????|?13200896?|?active?| |?348a90e8-3631-4a66-a45d-590ec6413e7d?|?glance_ceph_test????|?qcow2???????|?bare?????????????|?13200896?|?active?|????#上傳成功 +--------------------------------------+---------------------+-------------+------------------+----------+--------+

6.查看ceph池的數(shù)據(jù)

[root@controller_10_1_2_230?~]#?rados?-p?p_w_picpaths?ls rbd_directory rbd_header.10d7caaf292 rbd_data.10dd1fd73446.0000000000000001 rbd_id.348a90e8-3631-4a66-a45d-590ec6413e7d rbd_header.10dd1fd73446 rbd_data.10d7caaf292.0000000000000000 rbd_data.10dd1fd73446.0000000000000000 rbd_id.8a09b280-5916-44c6-9ce8-33bb57a09dad????@@@glance中的數(shù)據(jù)存儲到了ceph文件系統(tǒng)中@@@

4. 總結(jié)

? ?將openstack的glance的數(shù)據(jù)存儲到ceph中是一種非常好的解決方案，既能夠保障p_w_picpath數(shù)據(jù)的安全性，同時glance和nova在同個存儲池中，能夠基于copy-on-write的方式快速創(chuàng)建虛擬機，能夠在秒級為單位實現(xiàn)vm的創(chuàng)建。

? ?

轉(zhuǎn)載于:https://blog.51cto.com/happylab/1739642

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