介绍，目前已经创建一个名为ceph的Ceph集群，和一个backup（单节点）Ceph集群，是的这两个集群的数据可以同步，做备份恢复功能
(资料图片)
一、配置集群的相互访问
1.1 安装rbd mirror
rbd-mirror是一个新的守护进程，负责将一个镜像从一个集群同步到另一个集群
如果是单向同步，则只需要在备份集群上安装
如果是双向同步，则需要在两个集群上都安装
rbd-mirror需要连接本地和远程集群
每个集群只需要运行一个rbd-mirror进程，必须手动按章
[root@ceph5 ceph]# yum install rbd-mirror
1.2 互传配置文件
Ceph集群----->backu盘集群
[root@ceph2 ceph]# scp /etc/ceph/ceph.conf /etc/ceph/ceph.client.admin.keyring ceph5:/etc/ceph/
[root@ceph5 ceph]# ll -h
[root@ceph5 ceph]# chown ceph.ceph -R ./[root@ceph5 ceph]# ll
[root@ceph5 ceph]# ceph -s --cluster ceph
cluster: id: 35a91e48-8244-4e96-a7ee-980ab989d20d health: HEALTH_OK services: mon: 3 daemons, quorum ceph2,ceph3,ceph4 mgr: ceph4(active), standbys: ceph2, ceph3 osd: 9 osds: 9 up, 9 in data: pools: 2 pools, 192 pgs objects: 119 objects, 177 MB usage: 1500 MB used, 133 GB / 134 GB avail pgs: 192 active+clean
1.3 把配置文件从从端传到主端
[root@ceph5 ceph]# scp /etc/ceph/backup.conf /etc/ceph/backup.client.admin.keyring ceph2:/etc/ceph/
[root@ceph2 ceph]# ll
[root@ceph2 ceph]# chown -R ceph.ceph /etc/ceph/
[root@ceph2 ceph]# ll
[root@ceph2 ceph]# ceph -s --cluster backup
cluster: id: 51dda18c-7545-4edb-8ba9-27330ead81a7 health: HEALTH_OK services: mon: 1 daemons, quorum ceph5 mgr: ceph5(active) osd: 3 osds: 3 up, 3 in data: pools: 1 pools, 64 pgs objects: 5 objects, 133 bytes usage: 5443 MB used, 40603 MB / 46046 MB avail pgs: 64 active+clean
二、 配置镜像为池模式
如果是单向同步，则只需要在主集群修改，如果是双向同步，需要在两个集群上都修改，(如果只启用单向备份，则不需要在备份集群上开启镜像模式）
rbd_default_features = 125
也可不修改配置文件，而在创建镜像时指定需要启用的功能
2.1 创建镜像池
[root@ceph2 ceph]# ceph osd pool create rbdmirror 32 32
[root@ceph5 ceph]# ceph osd pool create rbdmirror 32 32
[root@ceph2 ceph]# yum -y install rbd-mirror
[root@ceph2 ceph]# rbd mirror pool enable rbdmirror pool --cluster ceph
[root@ceph2 ceph]# rbd mirror pool enable rbdmirror pool --cluster backup
2.2 增加同伴集群
需要将ceph和backup两个集群设置为同伴，这是为了让rbd-mirror进程找到它peer的集群的存储池
[root@ceph2 ceph]# rbd mirror pool peer add rbdmirror client.admin@ceph --cluster backup
[root@ceph2 ceph]# rbd mirror pool peer add rbdmirror client.admin@backup --cluster ceph
[root@ceph2 ceph]# rbd mirror pool info --pool=rbdmirror --cluster backup
[root@ceph2 ceph]# rbd mirror pool info --pool=rbdmirror --cluster ceph
[root@ceph2 ceph]# rbd mirror pool status rbdmirror
[root@ceph2 ceph]# rbd mirror pool status rbdmirror --cluster backup
2.3 创建RBD并开启journaling
在rbdmirror池中创建一个test镜像
[root@ceph2 ceph]# rbd create --size 1G rbdmirror/test
[root@ceph2 ceph]# rbd ls rbdmirror
在从端查看，为空并没有同步，是因为没有开启journing功能，从端没有开启mirror
[root@ceph2 ceph]# rbd ls rbdmirror --cluster backup
[root@ceph2 ceph]# rbd info rbdmirror/test
rbd image "test": size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.fbcd643c9869 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten flags: create_timestamp: Mon Mar 18 21:06:48 2019
[root@ceph2 ceph]# rbd feature enable rbdmirror/test journaling
[root@ceph2 ceph]# rbd info rbdmirror/test
rbd image "test": size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.fbcd643c9869 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, journaling flags: create_timestamp: Mon Mar 18 21:06:48 2019 journal: fbcd643c9869 mirroring state: enabled mirroring global id: 0f6993f2-8c34-4c49-a546-61fcb452ff40 mirroring primary: true #主是true
2.4 从端开启mirror进程
[root@ceph2 ceph]# rbd mirror pool status rbdmirror
2.5 前台手动启动调试
[root@ceph5 ceph]# rbd-mirror -d --setuser ceph --setgroup ceph --cluster backup -i admin
2019-03-18 21:12:39.521126 7f3a7f7c5340 0 set uid:gid to 1001:1001 (ceph:ceph)2019-03-18 21:12:39.521150 7f3a7f7c5340 0 ceph version 12.2.1-40.el7cp (c6d85fd953226c9e8168c9abe81f499d66cc2716) luminous (stable), process (unknown), pid 4512019-03-18 21:12:39.544922 7f3a7f7c5340 1 mgrc service_daemon_register rbd-mirror.admin metadata {arch=x86_64,ceph_version=ceph version 12.2.1-40.el7cp (c6d85fd953226c9e8168c9abe81f499d66cc2716) luminous (stable),cpu=QEMU Virtual CPU version 1.5.3,distro=rhel,distro_description=Red Hat Enterprise Linux Server 7.4 (Maipo),distro_version=7.4,hostname=ceph5,instance_id=4150,kernel_description=#1 SMP Thu Dec 28 14:23:39 EST 2017,kernel_version=3.10.0-693.11.6.el7.x86_64,mem_swap_kb=0,mem_total_kb=1883532,os=Linux}2019-03-18 21:12:42.743067 7f3a6bfff700 -1 rbd::mirror::ImageReplayer: 0x7f3a50016c70 [2/0f6993f2-8c34-4c49-a546-61fcb452ff40] handle_init_remote_journaler: image_id=1037140e0f76, m_client_meta.image_id=1037140e0f76, client.state=connected
[root@ceph5 ceph]# systemctl start ceph-rbd-mirror@admin
[root@ceph5 ceph]# ps aux|grep rbd
ceph 520 1.6 1.5 1202736 29176 ? Ssl 21:13 0:00 /usr/bin/rbd-mirror -f --cluster backup --id admin --setuser ceph --setgroup ceph
2.6 从端验证
查看已经同步
[root@ceph5 ceph]# rbd ls rbdmirror
[root@ceph5 ceph]# rbd info rbdmirror/test
rbd image "test": size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.1037140e0f76 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, journaling flags: create_timestamp: Mon Mar 18 21:12:41 2019 journal: 1037140e0f76 mirroring state: enabled mirroring global id: 0f6993f2-8c34-4c49-a546-61fcb452ff40 mirroring primary: false #从为false
现在相当于单向同步，
2.7 配置双向同步
主端手动启一下mirror
[root@ceph2 ceph]# /usr/bin/rbd-mirror -f --cluster ceph --id admin --setuser ceph --setgroup ceph -d
[root@ceph2 ceph]# systemctl restart ceph-rbd-mirror@admin
[root@ceph2 ceph]# ps aux|grep rbd
ceph 348407 1.0 0.4 1611988 17704 ? Ssl 21:19 0:00 /usr/bin/rbd-mirror -f --cluster ceph --id admin --setuser ceph --setgroup ceph
从端做主端，创建一个镜像：
[root@ceph5 ceph]# rbd create --size 1G rbdmirror/ceph5-rbd --image-feature journaling --image-feature exclusive-lock
[root@ceph5 ceph]# rbd info rbdmirror/ceph5-rbd
rbd image "ceph5-rbd": size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.103e74b0dc51 format: 2 features: exclusive-lock, journaling flags: create_timestamp: Mon Mar 18 21:21:43 2019 journal: 103e74b0dc51 mirroring state: enabled mirroring global id: c41dc1d8-43e5-44eb-ba3f-87dbb17f0d15 mirroring primary: true
[root@ceph5 ceph]# rbd ls rbdmirror
主端变从端
[root@ceph2 ceph]# rbd info rbdmirror/ceph5-rbd
rbd image "ceph5-rbd": size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.fbe541a7c4c9 format: 2 features: exclusive-lock, journaling flags: create_timestamp: Mon Mar 18 21:21:43 2019 journal: fbe541a7c4c9 mirroring state: enabled mirroring global id: c41dc1d8-43e5-44eb-ba3f-87dbb17f0d15 mirroring primary: false
查看基于池的同步信息
[root@ceph2 ceph]# rbd mirror pool status --pool=rbdmirror
查看image状态
[root@ceph2 ceph]# rbd mirror image status rbdmirror/test
test: global_id: 0f6993f2-8c34-4c49-a546-61fcb452ff40 state: up+stopped description: local image is primary last_update: 2019-03-18 21:25:48
三、基于镜像级别的双向同步
把池中的cephrbd1，作为镜像同步
[root@ceph2 ceph]# rbd ls
3.1 先为rbd池开启镜像模式
[root@ceph2 ceph]# rbd mirror pool enable rbd image --cluster ceph
[root@ceph2 ceph]# rbd mirror pool enable rbd image --cluster backup
3.2 增加同伴
[root@ceph2 ceph]# rbd mirror pool peer add rbd client.admin@ceph --cluster backup
[root@ceph2 ceph]# rbd mirror pool peer add rbd client.admin@backup --cluster ceph
[root@ceph2 ceph]# ceph osd pool ls
[root@ceph2 ceph]# rbd info cephrbd1
rbd image "cephrbd1": size 2048 MB in 512 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.fb2074b0dc51 format: 2 features: layering flags: create_timestamp: Sun Mar 17 21:23:52 2019
3.3 打开journaling
[root@ceph2 ceph]# rbd feature enable cephrbd1 exclusive-lock
[root@ceph2 ceph]# rbd feature enable cephrbd1 journaling
[root@ceph2 ceph]# rbd info cephrbd1
rbd image "cephrbd1": size 2048 MB in 512 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.fb2074b0dc51 format: 2 features: layering, exclusive-lock, journaling flags: create_timestamp: Sun Mar 17 21:23:52 2019 journal: fb2074b0dc51 mirroring state: disabled
3.4 开启镜像的mirror功能
[root@ceph2 ceph]# rbd mirror image enable rbd/cephrbd1
[root@ceph2 ceph]# rbd info rbd/cephrbd1
rbd image "cephrbd1":size 2048 MB in 512 objectsorder 22 (4096 kB objects)block_name_prefix: rbd_data.fb2074b0dc51format: 2features: layering, exclusive-lock, journalingflags: create_timestamp: Sun Mar 17 21:23:52 2019journal: fb2074b0dc51mirroring state: enabledmirroring global id: cfa19d96-1c41-47e3-bae0-0b9acfdcb72dmirroring primary: true
[root@ceph2 ceph]# rbd ls
3.5 从端验证
[root@ceph5 ceph]# rbd ls
同步成功
如果主挂掉，可以把从设为主，但是实验状态下，可以把主降级处理，然后把从设为主
3.6 降级处理
[root@ceph2 ceph]# rbd mirror image demote rbd/cephrbd1Image demoted to non-primary[root@ceph2 ceph]# rbd info cephrbd1rbd image "cephrbd1": size 2048 MB in 512 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.fb2074b0dc51 format: 2 features: layering, exclusive-lock, journaling flags: create_timestamp: Sun Mar 17 21:23:52 2019 journal: fb2074b0dc51 mirroring state: enabled mirroring global id: cfa19d96-1c41-47e3-bae0-0b9acfdcb72d mirroring primary: false[root@ceph5 ceph]# rbd mirror image promote cephrbd1Image promoted to primary[root@ceph5 ceph]# rbd info cephrbd1rbd image "cephrbd1": size 2048 MB in 512 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.1043836c40e format: 2 features: layering, exclusive-lock, journaling flags: create_timestamp: Mon Mar 18 21:38:48 2019 journal: 1043836c40e mirroring state: enabled mirroring global id: cfa19d96-1c41-47e3-bae0-0b9acfdcb72d mirroring primary: true #成为主，客户端就可以挂载到这里
3.7 池的升降级
[root@ceph2 ceph]# rbd mirror pool demote rbdmirrorDemoted 1 mirrored images[root@ceph2 ceph]# rbd mirror pool demote rbdmirrorDemoted 1 mirrored images[root@ceph2 ceph]# rbd info rbdmirror/ceph5-rbdrbd image "ceph5-rbd":size 1024 MB in 256 objectsorder 22 (4096 kB objects)block_name_prefix: rbd_data.fbe541a7c4c9format: 2features: exclusive-lock, journalingflags: create_timestamp: Mon Mar 18 21:21:43 2019journal: fbe541a7c4c9mirroring state: enabledmirroring global id: c41dc1d8-43e5-44eb-ba3f-87dbb17f0d15mirroring primary: false[root@ceph5 ceph]# rbd mirror pool promote rbdmirrorPromoted 1 mirrored images[root@ceph5 ceph]# rbd ls rbdmirrorceph5-rbdtest[root@ceph5 ceph]# rbd info rbdmirror/ceph5-rbdrbd image "ceph5-rbd": size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.103e74b0dc51 format: 2 features: exclusive-lock, journaling flags: create_timestamp: Mon Mar 18 21:21:43 2019 journal: 103e74b0dc51 mirroring state: enabled mirroring global id: c41dc1d8-43e5-44eb-ba3f-87dbb17f0d15 mirroring primary: true[root@ceph5 ceph]# rbd info rbdmirror/testrbd image "test": size 1024 MB in 256 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.1037140e0f76 format: 2 features: layering, exclusive-lock, object-map, fast-diff, deep-flatten, journaling flags: create_timestamp: Mon Mar 18 21:12:41 2019 journal: 1037140e0f76 mirroring state: enabled mirroring global id: 0f6993f2-8c34-4c49-a546-61fcb452ff40 mirroring primary: true
3.8 摘掉mirror
[root@ceph2 ceph]# rbd mirror pool info --pool=rbdmirrorMode: poolPeers: UUID NAME CLIENT 40e4fd11-5f9d-44b2-9f11-b57968be62cf backup client.admin [root@ceph2 ceph]# rbd mirror pool info --pool=rbdmirror --cluster backupMode: poolPeers: UUID NAME CLIENT ccb2faba-8108-454b-9c87-1a1bf292a76b ceph client.admin
[root@ceph5 ceph]# rbd mirror pool peer remove --pool=rbdmirror 761872b4-03d8-4f0a-972e-dc61575a785f --cluster backup
[root@ceph5 ceph]# rbd mirror image disable rbd/cephrbd1 --force
[root@ceph5 ceph]# rbd info cephrbd1
rbd image "cephrbd1": size 2048 MB in 512 objects order 22 (4096 kB objects) block_name_prefix: rbd_data.1043836c40e format: 2 features: layering, exclusive-lock, journaling flags: create_timestamp: Mon Mar 18 21:38:48 2019 journal: 1043836c40e mirroring state: disabled #已经关闭了镜像的mirror
Ceph的集群间相互访问备份配置完成！！！
博主声明：本文的内容来源主要来自誉天教育晏威老师，由本人实验完成操作验证，需要的博友请联系誉天教育（http://www.yutianedu.com/），获得官方同意或者晏老师（https://www.cnblogs.com/breezey/）本人同意即可转载，谢谢！
