簡介

Linux持續不斷進軍可擴充套件計算空間，特別是可擴充套件儲存空間，Ceph 最近加入到 Linux 中令人印象深刻的檔案系統備選行列，它是一個分散式檔案系統，能夠在維護 POSIX 相容性的同時加入了複製和容錯功能
Ceph 生態系統架構可以劃分為四部分：
1、Clients：客戶端（資料使用者）
2、cmds：Metadata server cluster，元資料伺服器（快取和同步分散式元資料）
3、cosd：Object storage cluster，物件儲存叢集（將資料和元資料作為物件儲存，執行其他關鍵職能）
4、cmon：Cluster monitors，叢集監視器（執行監視功能）

前期準備

準備兩臺Centos8虛擬機器，配置IP地址和hostname，同步系統時間，關閉防火牆和selinux，修改IP地址和hostname對映，每臺虛擬機器新增一塊硬碟

配置openstack可參考:https://blog.51cto.com/14832653/2542863
注：若已經建立openstack叢集，需要先把例項，映象和捲進行刪除
安裝ceph源

[root@controller ~]# yum install centos-release-ceph-octopus.noarch -y
[root@computer ~]# yum install centos-release-ceph-octopus.noarch -y
 

安裝ceph元件

[root@controller ~]# yum install cephadm -y
[root@computer ~]# yum install ceph -y

computer結點安裝libvirt

[root@computer ~]# yum install libvirt -y

部署ceph叢集

建立叢集

[root@controller ~]# mkdir -p /etc/ceph
[root@controller ~]# cd /etc/ceph/
[root@controller ceph]# cephadm boostrap --mon-ip 192.168.29.148
[root@controller ceph]# ceph status
[root@controller ceph]#  cephadm install ceph-common
[root@controller ceph]# ssh-copy-id -f -i /etc/ceph/ceph.pub root@computer
 

修改配置

[root@controller ceph]# ceph config set mon public_network 192.168.29.0/24

新增主機

[root@controller ceph]# ceph orch host add computer
[root@controller ceph]# ceph orch host ls

初始化叢集監控

[root@controller ceph]# ceph orch host label add controller mon
[root@controller ceph]# ceph orch host label add computer mon
[root@controller ceph]# ceph orch apply mon label:mon
[root@controller ceph]# ceph orch daemon add mon computer:192.168.29.149

建立OSD

[root@controller ceph]# ceph orch daemon add osd controller:/dev/nvme0n2
[root@controller ceph]# ceph orch daemon add osd computer:/dev/nvme0n3

檢視叢集狀態

[root@controller ceph]# ceph -s

檢視叢集容量

[root@controller ceph]# ceph df

建立pool

[root@controller ceph]# ceph osd pool create volumes 64
[root@controller ceph]# ceph osd pool create vms 64

#設定自啟動
[root@controller ceph]# ceph osd pool application enable vms mon
[root@controller ceph]# ceph osd pool application enable volumes mon

檢視mon,osd,pool狀態

[root@controller ceph]# ceph mon stat
[root@controller ceph]#  ceph osd status
[root@controller ceph]# ceph osd lspools

檢視pool情況

[root@controller ~]# rbd ls vms
[root@controller ~]# rbd ls volumes

ceph叢集與openstack對接

建立cinder並設定許可權

[root@controller ceph]# 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'

設定金鑰

[root@controller ceph]# ceph auth get-or-create client.cinder | tee /etc/ceph/ceph.client.cinder.keyring

#傳送金鑰到computer
[root@controller ~]# ceph auth get-key client.cinder > client.cinder.key
[root@controller ~]# scp client.cinder.key computer:/root/

#修改許可權
[root@controller ceph]# chown  cinder.cinder /etc/ceph/ceph.client.cinder.keyring

設定金鑰

#computer生成uuid
[root@computer ~]#uuidgen
1fad1f90-63fb-4c15-bfc3-366c6559c1fe 

#建立金鑰檔案
[root@computer ~]# vi secret.xml
 <secret ephemeral='no' private='no'>
   <uuid>1fad1f90-63fb-4c15-bfc3-366c6559c1fe </uuid>
   <usage type='ceph'>
    <name>client.cinder secret</name>
   </usage>
</secret>

#定義金鑰
virsh secret-define --file secret.xml

#設定金鑰
virsh secret-set-value --secret 1fad1f90-63fb-4c15-bfc3-366c6559c1fe  --base64 $(cat client.cinder.key) && rm -rf client.cinder.key secret.xml

設定對接cinder模組

修改配置檔案

[root@controller ~]# vi /etc/cinder/cinder.conf
[default]
rpc_backend = rabbit
auth_strategy = keystone
my_ip = 192.168.29.148
enabled_backends = ceph

[ceph]
default_volume_type= ceph
glance_api_version = 2  
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
rbd_user = cinder
#對應computer建立的uuid
rbd_secret_uuid = 1fad1f90-63fb-4c15-bfc3-366c6559c1fe 

同步資料庫

#若已經有資料庫，對資料庫進行刪除並重新建立和同步
[root@controller ~]# su -s /bin/sh -c "cinder-manage db sync" cinder

重啟服務

[root@controller ~]# systemctl restart openstack-cinder-api.service openstack-cinder-scheduler.service openstack-cinder-volume.service

設定ceph的型別和儲存型別

[root@controller ~]# source admin-openrc 
[root@controller ~]# cinder type-create  ceph 
[root@controller ~]# cinder type-key ceph set volume_backend_name=ceph

對接nova-compute模組

computer結點修改配置檔案

[root@computer ~]# vi /etc.nova/nova.conf
[libvirt]
virt_type = qemu
inject_password = true
inject_partition = -1
images_type = rbd
images_rbd_pool = vms
images_rbd_ceph_conf = /etc/ceph/ceph.conf
rbd_user = cinder
rbd_secret_uuid = 1fad1f90-63fb-4c15-bfc3-366c6559c1fe
disk_cachemodes = "network=writeback"
live_migration_flag = "VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE,VIR_MIGRATE_PERSIST_DEST,VIR_MIGRATE_TUNNELLED"
hw_disk_discard = unmap

[root@computer ~]# vi /etc/ceph/ceph.conf 
[client]
rbd cache=true
rbd cache writethrough until flush=true
admin socket = /var/run/ceph/guests/$cluster-$type.$id.$pid.$cctid.asok
log file = /var/log/qemu/qemu-guest-$pid.log
rbd concurrent management ops = 20

建立日誌目錄

[root@computer ~]# mkdir -p /var/run/ceph/guests/ /var/log/qemu/
[root@computer ~]# chown 777 -R /var/run/ceph/guests/ /var/log/qemu/

controller下發金鑰

[root@controller ~]# cd /etc/ceph
[root@controller ~]# scp ceph.client.cinder.keyring root@computer:/etc/ceph

重啟服務

[root@computer ~]# systemctl stop libvirtd openstack-nova-compute
[root@computer ~]# systemctl start libvirtd openstack-nova-compute