简介
Linux持续不断进军可扩展计算空间，特别是可扩展存储空间，Ceph 最近加入到 Linux 中令人印象深刻的文件系统备选行列，它是一个分布式文件系统，能够在维护 POSIX 兼容性的同时加入了复制和容错功能
Ceph 生态系统架构可以划分为四部分：
1、Clients：客户端（数据用户）
2、cmds：Metadata server cluster，元数据服务器（缓存和同步分布式元数据）
3、cosd：Object storage cluster，对象存储集群（将数据和元数据作为对象存储，执行其他关键职能）
4、cmon：Cluster monitors，集群监视器（执行监视功能）
前期准备
准备两台Centos8虚拟机，配置IP地址和hostname，同步系统时间，关闭防火墙和selinux，修改IP地址和hostname映射，每台虚拟机添加一块硬盘
| ip | hostname |
|---|---|
| 192.168.29.148 | controller |
| 192.168.29.149 | computer |
配置openstack可参考:https://blog.51cto.com/14832653/2542863
注：若已经创建openstack集群，需要先把实例，镜像和卷进行删除
安装ceph源
[root@controller ~]# yum install centos-release-ceph-octopus.noarch -y
[root@computer ~]# yum install centos-release-ceph-octopus.noarch -y安装ceph组件
[root@controller ~]# yum install cephadm -y
[root@computer ~]# yum install ceph -ycomputer结点安装libvirt
[root@computer ~]# yum install libvirt -y部署ceph集群
创建集群
[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添加主机
[root@controller ceph]# ceph orch host add computer
[root@controller ceph]# ceph orch host ls初始化集群监控
[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创建OSD
[root@controller ceph]# ceph orch daemon add osd controller:/dev/nvme0n2
[root@controller ceph]# ceph orch daemon add osd computer:/dev/nvme0n3查看集群状态
[root@controller ceph]# ceph -s查看集群容量
[root@controller ceph]# ceph df创建pool
[root@controller ceph]# ceph osd pool create volumes 64
[root@controller ceph]# ceph osd pool create vms 64
#设置自启动
[root@controller ceph]# ceph osd pool application enable vms mon
[root@controller ceph]# ceph osd pool application enable volumes mon查看mon,osd,pool状态
[root@controller ceph]# ceph mon stat
[root@controller ceph]# ceph osd status
[root@controller ceph]# ceph osd lspools查看pool情况
[root@controller ~]# rbd ls vms
[root@controller ~]# rbd ls volumesceph集群与openstack对接
创建cinder并设置权限
[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'设置密钥
[root@controller ceph]# ceph auth get-or-create client.cinder | tee /etc/ceph/ceph.client.cinder.keyring
#传送密钥到computer
[root@controller ~]# ceph auth get-key client.cinder > client.cinder.key
[root@controller ~]# scp client.cinder.key computer:/root/
#修改权限
[root@controller ceph]# chown cinder.cinder /etc/ceph/ceph.client.cinder.keyring设置密钥
#computer生成uuid
[root@computer ~]#uuidgen
1fad1f90-63fb-4c15-bfc3-366c6559c1fe
#创建密钥文件
[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>
#定义密钥
virsh secret-define --file secret.xml
#设置密钥
virsh secret-set-value --secret 1fad1f90-63fb-4c15-bfc3-366c6559c1fe --base64 $(cat client.cinder.key) && rm -rf client.cinder.key secret.xml设置对接cinder模块
修改配置文件
[root@controller ~]# vi /etc/cinder/cinder.conf
[default]
rpc_backend = rabbit
auth_strategy = keystone
my_ip = 192.168.29.148
enabled_backends = ceph
[ceph]
default_volume_type= ceph
glance_api_version = 2
volume_driver = cinder.volume.drivers.rbd.RBDDriver
volume_backend_name = ceph
rbd_pool = volumes
rbd_ceph_conf = /etc/ceph/ceph.conf
rbd_flatten_volume_from_snapshot = false
rbd_max_clone_depth = 5
rbd_store_chunk_size = 4
rados_connect_timeout = -1
rbd_user = cinder
#对应computer创建的uuid
rbd_secret_uuid = 1fad1f90-63fb-4c15-bfc3-366c6559c1fe 同步数据库
#若已经有数据库，对数据库进行删除并重新创建和同步
[root@controller ~]# su -s /bin/sh -c "cinder-manage db sync" cinder重启服务
[root@controller ~]# systemctl restart openstack-cinder-api.service openstack-cinder-scheduler.service openstack-cinder-volume.service设置ceph的类型和存储类型
[root@controller ~]# source admin-openrc
[root@controller ~]# cinder type-create ceph
[root@controller ~]# cinder type-key ceph set volume_backend_name=ceph对接nova-compute模块
computer结点修改配置文件
[root@computer ~]# vi /etc.nova/nova.conf
[libvirt]
virt_type = qemu
inject_password = true
inject_partition = -1
images_type = rbd
images_rbd_pool = vms
images_rbd_ceph_conf = /etc/ceph/ceph.conf
rbd_user = cinder
rbd_secret_uuid = 1fad1f90-63fb-4c15-bfc3-366c6559c1fe
disk_cachemodes = "network=writeback"
live_migration_flag = "VIR_MIGRATE_UNDEFINE_SOURCE,VIR_MIGRATE_PEER2PEER,VIR_MIGRATE_LIVE,VIR_MIGRATE_PERSIST_DEST,VIR_MIGRATE_TUNNELLED"
hw_disk_discard = unmap[root@computer ~]# vi /etc/ceph/ceph.conf
[client]
rbd cache=true
rbd cache writethrough until flush=true
admin socket = /var/run/ceph/guests/$cluster-$type.$id.$pid.$cctid.asok
log file = /var/log/qemu/qemu-guest-$pid.log
rbd concurrent management ops = 20创建日志目录
[root@computer ~]# mkdir -p /var/run/ceph/guests/ /var/log/qemu/
[root@computer ~]# chown 777 -R /var/run/ceph/guests/ /var/log/qemu/controller下发密钥
[root@controller ~]# cd /etc/ceph
[root@controller ~]# scp ceph.client.cinder.keyring root@computer:/etc/ceph重启服务
[root@computer ~]# systemctl stop libvirtd openstack-nova-compute
[root@computer ~]# systemctl start libvirtd openstack-nova-compute来源：oschina
链接：https://my.oschina.net/u/4340062/blog/4685282