1：简介
在企业生产环境中，随着时间的迁移数据会存在磁盘空间不足，或者机器节点故障等情况。OSD又是实际存储数据，所以扩容和缩容OSD就很有必要性
随着我们数据量的增长，后期可能我们需要对osd进行扩容。目前扩容分为两种，一种为横向扩容，另外一种为纵向扩容
1：横向扩容scale out增加节点，添加更多的节点进来，让集群包含更多的节点
2：纵向扩容scale up增加磁盘，添加更多的硬盘进行，来增加存储容量
2：实战操作
2.1：横向扩容
横向扩容实际上就是把新机器加入Ceph集群而已，这里我快速过一遍
新增节点名称为 ceph-4
# NTP SERVER (ntp server 与阿里与ntp时间服务器进行同步)
[root@virtual_host ~]# yum install -y ntp
[root@virtual_host ~]# systemctl start ntpd
[root@virtual_host ~]# systemctl enable ntpd
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpd.service to /usr/lib/systemd/system/ntpd.service.
[root@virtual_host ~]# timedatectl set-timezone Asia/Shanghai
[root@virtual_host ~]# timedatectl set-local-rtc 0
[root@virtual_host ~]# systemctl restart rsyslog
systemctl restart rsyslog
[root@virtual_host ~]# systemctl restart crond
ntp agent需要修改ntp server的地址
[root@virtual_host ~]# cat /etc/ntp.conf | grep server | grep -v "^#"
server 10.0.0.10 iburst
[root@virtual_host ~]# ntpq -pn
remote refid st t when poll reach delay offset jitter
==============================================================================
* 10.0.0.10 .INIT. 16 u - 64 0 0.000 0.000 0.000
# ceph节点操作相同
在ntp_agent节点添加定时同步任务
[root@virtual_host ~]# crontab -l
*/5 * * * * /usr/sbin/ntpdate 10.0.0.10
# 更改所有节点的host 加入新的机器
10.0.0.10 ceph-1
10.0.0.11 ceph-2
10.0.0.12 ceph-3
10.0.0.13 ceph-4
# 更改host
[root@virtual_host ~]# hostnamectl set-hostname ceph-4
# 关闭防火墙与selinux等
[root@ceph-4 ~]# systemctl stop firewalld
[root@ceph-4 ~]# systemctl disable firewalld
[root@ceph-4 ~]# iptables -F && iptables -X && iptables -F -t nat && iptables -X -t nat
[root@ceph-4 ~]# iptables -P FORWARD ACCEPT
[root@ceph-4 ~]# setenforce 0
[root@ceph-4 ~]# sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config
# 配置源地址
[root@ceph-4 ~]# curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
[root@ceph-4 ~]# wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
[root@ceph-4 ~]# wget -O /etc/yum.repos.d/ceph.repo http://down.i4t.com/ceph/ceph.repo
[root@ceph-4 ~]# yum clean all && yum makecache
# 安装ceph
[root@ceph-4 ~]# yum install -y ceph vim wget
# 使用 ceph-1配置免密到 ceph-4
[root@ceph-1 ceph-deploy]# ssh-copy-id root@ceph-4
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
The authenticity of host 'ceph-4 (10.0.0.13)' can't be established.
ECDSA key fingerprint is SHA256:2ysKwIOq1nrOh1CXWJyKU/DupX/wPD1PQeJeNHYQaC8.
ECDSA key fingerprint is MD5:7c:ae:c3:90:f6:6b:06:b1:46:1c:9d:81:7d:cc:2b:9d.
Are you sure you want to continue connecting (yes/no)? yes
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@ceph-4's password:
Number of key(s) added: 1
Now try logging into the machine, with: "ssh 'root@ceph-4'"
and check to make sure that only the key(s) you wanted were added.
# 进入mon节点，分发配置文件，添加osd节点 (ceph-1操作)
[root@ceph-1 ceph-deploy]# cd /root/ceph-deploy/
[root@ceph-1 ceph-deploy]# ceph-deploy --overwrite-conf config push ceph-4
[root@ceph-1 ceph-deploy]# ceph-deploy osd create --data /dev/sdb ceph-4
[root@ceph-1 ceph-deploy]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.06857 root default
-3 0.01959 host ceph-1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
-5 0.01959 host ceph-2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
4 hdd 0.00980 osd.4 up 1.00000 1.00000
-7 0.01959 host ceph-3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
-9 0.00980 host ceph-4
6 hdd 0.00980 osd.6 up 1.00000 1.00000
[root@ceph-1 ceph-deploy]# ceph -s
cluster:
id: fb39bc5c-ac88-4b06-a580-5df5611ee976
health: HEALTH_WARN
Degraded data redundancy: 24/1380 objects degraded (1.739%), 3 pgs degraded
services:
mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 16h)
mgr: ceph-1(active, since 16h), standbys: ceph-2, ceph-3
mds: cephfs_devopsdu:1 {0=ceph-1=up:active} 2 up:standby
osd: 7 osds: 7 up (since 57s), 7 in (since 57s) # 因为前面的机器都带了两块盘所以加上ceph-4正好7块
rgw: 1 daemon active (ceph-1)
task status:
data:
pools: 10 pools, 416 pgs
objects: 460 objects, 867 MiB
usage: 9.9 GiB used, 60 GiB / 70 GiB avail
pgs: 24/1380 objects degraded (1.739%)
9/1380 objects misplaced (0.652%)
412 active+clean
3 active+recovery_wait+undersized+degraded+remapped
1 active+recovering+undersized+remapped
io:
recovery: 4.0 MiB/s, 2 objects/s
progress:
Rebalancing after osd.6 marked in
[============================..]
# 这样横向扩容就完成了
2.2：纵向扩容
纵向扩容即添加一块新硬盘即可 (我这里只添加ceph-4服务器一块10G盘)，理想状态是 osd为8，虚拟化热加载就OK了
扫描命令如下
[root@ceph-4 ~]# echo "- - -" >/sys/class/scsi_host/host0/scan
[root@ceph-4 ~]# echo "- - -" >/sys/class/scsi_host/host1/scan
[root@ceph-4 ~]# echo "- - -" >/sys/class/scsi_host/host2/scan
[root@ceph-4 ~]# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 20G 0 disk
├─sda1 8:1 0 1G 0 part /boot
└─sda2 8:2 0 19G 0 part
├─centos-root 253:0 0 17G 0 lvm /
└─centos-swap 253:1 0 2G 0 lvm
sdb 8:16 0 10G 0 disk
└─ceph--d1007d7d--b140--4aa5--bf5d--9d7f1a111b3c-osd--block--568f45a6--cf64--4af0--89e1--e375228dfbda 253:2 0 10G 0 lvm
sdc 8:32 0 10G 0 disk
sr0 11:0 1 1024M 0 rom
可以看到sdc已经刷新出来了
如果我们新增的硬盘有数据和分区需要初始化，可以通过下面的命令进行处理
[root@ceph-4 ~]# fdisk -l /dev/sdc
Disk /dev/sdc: 10.7 GB, 10737418240 bytes, 20971520 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
[root@ceph-1 ceph-deploy]# ceph-deploy disk zap ceph-4 /dev/sdc
[ceph_deploy.conf][DEBUG ] found configuration file at: /root/.cephdeploy.conf
[ceph_deploy.cli][INFO ] Invoked (2.0.1): /usr/bin/ceph-deploy disk zap ceph-4 /dev/sdc
[ceph_deploy.cli][INFO ] ceph-deploy options:
[ceph_deploy.cli][INFO ] username : None
[ceph_deploy.cli][INFO ] verbose : False
[ceph_deploy.cli][INFO ] debug : False
[ceph_deploy.cli][INFO ] overwrite_conf : False
[ceph_deploy.cli][INFO ] subcommand : zap
[ceph_deploy.cli][INFO ] quiet : False
[ceph_deploy.cli][INFO ] cd_conf : <ceph_deploy.conf.cephdeploy.Conf instance at 0x7f083f211440>
[ceph_deploy.cli][INFO ] cluster : ceph
[ceph_deploy.cli][INFO ] host : ceph-4
[ceph_deploy.cli][INFO ] func : <function disk at 0x7f083f45f938>
[ceph_deploy.cli][INFO ] ceph_conf : None
[ceph_deploy.cli][INFO ] default_release : False
[ceph_deploy.cli][INFO ] disk : ['/dev/sdc']
[ceph_deploy.osd][DEBUG ] zapping /dev/sdc on ceph-4
[ceph-4][DEBUG ] connected to host: ceph-4
[ceph-4][DEBUG ] detect platform information from remote host
[ceph-4][DEBUG ] detect machine type
[ceph-4][DEBUG ] find the location of an executable
[ceph_deploy.osd][INFO ] Distro info: CentOS Linux 7.9.2009 Core
[ceph-4][DEBUG ] zeroing last few blocks of device
[ceph-4][DEBUG ] find the location of an executable
[ceph-4][INFO ] Running command: /usr/sbin/ceph-volume lvm zap /dev/sdc
[ceph-4][WARNIN] --> Zapping: /dev/sdc
[ceph-4][WARNIN] --> --destroy was not specified, but zapping a whole device will remove the partition table
[ceph-4][WARNIN] Running command: /bin/dd if=/dev/zero of=/dev/sdc bs=1M count=10 conv=fsync
[ceph-4][WARNIN] stderr: 10+0 records in
[ceph-4][WARNIN] 10+0 records out
[ceph-4][WARNIN] 10485760 bytes (10 MB) copied
[ceph-4][WARNIN] stderr: , 0.0217859 s, 481 MB/s
[ceph-4][WARNIN] --> Zapping successful for: <Raw Device: /dev/sdc>
# 你可以理解为，这里其实就是使用了 dd对磁盘进行了覆盖
# 扩容
[root@ceph-1 ceph-deploy]# ceph-deploy osd create ceph-4 --data /dev/sdc
[root@ceph-1 ceph-deploy]# ceph -s
cluster:
id: fb39bc5c-ac88-4b06-a580-5df5611ee976
health: HEALTH_WARN
Degraded data redundancy: 153/1380 objects degraded (11.087%), 33 pgs degraded
services:
mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 16h)
mgr: ceph-1(active, since 16h), standbys: ceph-2, ceph-3
mds: cephfs_devopsdu:1 {0=ceph-1=up:active} 2 up:standby
osd: 8 osds: 8 up (since 29s), 8 in (since 29s); 9 remapped pgs # 可以看到，数量上来了
rgw: 1 daemon active (ceph-1)
task status:
data:
pools: 10 pools, 416 pgs
objects: 460 objects, 867 MiB
usage: 11 GiB used, 69 GiB / 80 GiB avail # 8块盘都是10G，大小为80G正好
pgs: 153/1380 objects degraded (11.087%)
9/1380 objects misplaced (0.652%)
377 active+clean
22 active+recovery_wait+degraded
11 active+recovery_wait+undersized+degraded+remapped
3 active+recovery_wait
2 active+recovering
1 active+recovering+undersized+remapped
io:
recovery: 11 MiB/s, 7 objects/s
progress:
Rebalancing after osd.7 marked in
[=======================.......]
# 通过ceph osd tree查看
[root@ceph-1 ceph-deploy]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.07837 root default
-3 0.01959 host ceph-1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
-5 0.01959 host ceph-2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
4 hdd 0.00980 osd.4 up 1.00000 1.00000
-7 0.01959 host ceph-3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
-9 0.01959 host ceph-4
6 hdd 0.00980 osd.6 up 1.00000 1.00000
7 hdd 0.00980 osd.7 up 1.00000 1.00000
3：数据重分布
数据重分布原理
当Ceph OSD添加到Ceph存储集群时，集群映射会使用新的 OSD 进行更新。回到计算 PG ID中，这会更改集群映射。因此，它改变了对象的放置，因为它改变了计算的输入。下图描述了重新平衡过程（尽管相当粗略，因为它对大型集群的影响要小得多），其中一些但不是所有 PG 从现有 OSD（OSD 1 和 OSD 2）迁移到新 OSD（OSD 3） ）。即使在再平衡时，许多归置组保持原来的配置，每个OSD都获得了一些额外的容量，因此在重新平衡完成后新 OSD 上没有负载峰值。
PG中存储的是subject，因为subject计算比较复杂，所以ceph会直接迁移pg保证集群平衡
# 我们将文件复制到CEPHFS文件存储中，通过ceph健康检查，就可以看到下面的PG同步的状态
[root@ceph-1 devopsdu]# dd if=/dev/zero of=devopsdu bs=1M count=4096
[root@ceph-1 ceph-deploy]# ceph -s
cluster:
id: fb39bc5c-ac88-4b06-a580-5df5611ee976
health: HEALTH_OK
services:
mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 77s)
mgr: ceph-1(active, since 16h), standbys: ceph-2, ceph-3
mds: cephfs_devopsdu:1 {0=ceph-1=up:active} 2 up:standby
osd: 8 osds: 8 up (since 6m), 8 in (since 6m)
rgw: 1 daemon active (ceph-1)
task status:
data:
pools: 10 pools, 416 pgs
objects: 758 objects, 2.0 GiB
usage: 14 GiB used, 66 GiB / 80 GiB avail
pgs: 416 active+clean
io:
client: 52 MiB/s wr, 0 op/s rd, 48 op/s wr
# 当PG数据同步完成后，ceph集群health状态就变更为OK
# 温馨提示，当ceph osd执行重分配时，会影响ceph集群正常写入的操作。所以当更新升级osd节点时建议一台一台进行更新，或者临时关闭rebalance
ceph osd 重分布以及写入数据是可以指定2块网卡，生产环境建议ceph配置双网段。cluster_network为osd数据扩容同步重分配网卡，public_network为ceph客户端连接的网络。设置双网段可以减少重分布造成的影响
[root@ceph-1 ceph-deploy]# ceph osd set norebalance
norebalance is set
[root@ceph-1 ceph-deploy]# ceph osd set nobackfill
nobackfill is set
[root@ceph-1 ceph-deploy]# ceph -s
cluster:
id: fb39bc5c-ac88-4b06-a580-5df5611ee976
health: HEALTH_WARN
nobackfill,norebalance flag(s) set
services:
mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 6m)
mgr: ceph-1(active, since 16h), standbys: ceph-2, ceph-3
mds: cephfs_devopsdu:1 {0=ceph-1=up:active} 2 up:standby
osd: 8 osds: 8 up (since 11m), 8 in (since 11m)
flags nobackfill,norebalance
rgw: 1 daemon active (ceph-1)
task status:
data:
pools: 10 pools, 416 pgs
objects: 2.79k objects, 10 GiB
usage: 38 GiB used, 42 GiB / 80 GiB avail
pgs: 416 active+clean
# 当我们设置了norebalance nobackfill ，ceph会将重分布给暂停掉。ceph业务就可以访问正常
解除rebalance命令如下
[root@ceph-1 ceph-deploy]# ceph osd unset norebalance
norebalance is unset
[root@ceph-1 ceph-deploy]# ceph osd unset nobackfill
nobackfill is unset
[root@ceph-1 ceph-deploy]# ceph -s
cluster:
id: fb39bc5c-ac88-4b06-a580-5df5611ee976
health: HEALTH_OK
services:
mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 6m)
mgr: ceph-1(active, since 16h), standbys: ceph-2, ceph-3
mds: cephfs_devopsdu:1 {0=ceph-1=up:active} 2 up:standby
osd: 8 osds: 8 up (since 12m), 8 in (since 12m)
rgw: 1 daemon active (ceph-1)
task status:
data:
pools: 10 pools, 416 pgs
objects: 2.79k objects, 10 GiB
usage: 38 GiB used, 42 GiB / 80 GiB avail
pgs: 416 active+clean
4：OSD缩容
当某个时间段我们OSD服务器受到外部因素影响，硬盘更换，或者是节点DOWN机需要手动剔除OSD节点。
目前ceph osd状态
[root@ceph-1 ceph-deploy]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.07837 root default
-3 0.01959 host ceph-1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
-5 0.01959 host ceph-2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
4 hdd 0.00980 osd.4 up 1.00000 1.00000
-7 0.01959 host ceph-3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
-9 0.01959 host ceph-4
6 hdd 0.00980 osd.6 up 1.00000 1.00000
7 hdd 0.00980 osd.7 up 1.00000 1.00000
目前我们ceph节点一共有4台，其中ceph-1有2个osd节点。 假设我们ceph-4节点出现故障，软件或者硬件故障，需要将ceph-4从ceph集群中剔除
ceph osd perf 可以看到ceph中osd的延迟，如果生产中遇到哪块盘延迟较大，可以进行手动剔除
[root@ceph-1 ceph-deploy]# ceph osd perf
osd commit_latency(ms) apply_latency(ms)
7 0 0
6 0 0
5 0 0
4 0 0
0 0 0
1 0 0
2 0 0
3 0 0
故障发生后，如果一定时间后重新上线故障 OSD，那么 PG 会进行以下流程:
1：故障OSD上线，通知Monitor并注册，该OSD在上线前会读取存在持久化的设备的PGLog
2：Monitor 得知该OSD的旧id，因此会继续使用以前的PG分配，之前该OSD下线造成的Degraded PG会被通知该OSD已经中心加入
3：这时候分为两种情况，以下两种情况PG会标记自己为Peering状态并暂时停止处理请求
3.1：故障OSD是拥有Primary PG,它作为这部分数据权责主题，需要发送查询PG元数据请求给所有属于该PG的Replicate角色节点。该PG的Replicate角色节点实际上在故障OSD下线时期成为了Primary角色并维护了权威的PGLog，该PG在得到OSD的Primary PG的查询请求后会发送回应。Primary PG通过对比Replicate PG发送的元数据和PG版本信息后发现处于落后状态，因此会合并到PGLog并建立权威PGLog，同时会建立missing列表来标记过时数据
3.2：故障OSD是拥有Replicate PG,这时上线后故障OSD的Replicate PG会得到Primary PG的查询请求，发送自己这份过时的元数据和PGLog。Primary PG对比数据后发现该PG落后时，通过PGLog建立missing列表。
4：PG开始接受IO请求，但是PG所属的故障节点仍存在过时数据，故障节点的Primary PG会发起Pull请求从Replicate节点获得最新数据，Replicate PG会得到其它OSD节点的Primary PG的Push请求来恢复数据
4：恢复完成后标记自己Clean
# 第三步是PG唯一不处理请求的阶段，它通常会在1s内完成来减少不可用时间。但是这里仍然有其他问题，比如恢复期间故障OSD会维护missing列表，如果IO正好是处于missing列表的数据，那么PG会进行恢复数据的插队操作，主动将该IO涉及的数据从Replicate PG拉过来，提前恢复该部分数据。这个情况延迟大概几十毫秒
首先我们模拟ceph-4节点异常，异常的情况有很多，我直接down掉ceph-4
检查ceph状态
[root@ceph-1 ceph-deploy]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.07837 root default
-3 0.01959 host ceph-1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
-5 0.01959 host ceph-2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
4 hdd 0.00980 osd.4 up 1.00000 1.00000
-7 0.01959 host ceph-3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
-9 0.01959 host ceph-4
6 hdd 0.00980 osd.6 down 1.00000 1.00000
7 hdd 0.00980 osd.7 down 1.00000 1.00000
ceph-4中的osd状态已经是down的状态
[root@ceph-1 ceph-deploy]# ceph -s
cluster:
id: fb39bc5c-ac88-4b06-a580-5df5611ee976
health: HEALTH_WARN
2 osds down
1 host (2 osds) down
Degraded data redundancy: 2158/8358 objects degraded (25.820%), 106 pgs degraded
services:
mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 21m)
mgr: ceph-1(active, since 17h), standbys: ceph-2, ceph-3
mds: cephfs_devopsdu:1 {0=ceph-1=up:active} 2 up:standby
osd: 8 osds: 6 up (since 39s), 8 in (since 26m)
rgw: 1 daemon active (ceph-1)
task status:
data:
pools: 10 pools, 416 pgs
objects: 2.79k objects, 10 GiB
usage: 38 GiB used, 42 GiB / 80 GiB avail
pgs: 2158/8358 objects degraded (25.820%)
233 active+undersized
106 active+undersized+degraded
77 active+clean
# 可以看到，大概有2158个object受到影响
通过ceph -s可以看到异常的osd在ceph-4上，osd的节点为osd.6，osd.7。下面执行osd out，可以将权重变小
[root@ceph-1 ceph-deploy]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.07837 root default
-3 0.01959 host ceph-1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
-5 0.01959 host ceph-2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
4 hdd 0.00980 osd.4 up 1.00000 1.00000
-7 0.01959 host ceph-3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
-9 0.01959 host ceph-4
6 hdd 0.00980 osd.6 down 0 1.00000
7 hdd 0.00980 osd.7 down 0 1.00000
[root@ceph-1 ceph-deploy]# ceph osd out osd.6
osd.6 is already out.
[root@ceph-1 ceph-deploy]# ceph osd out osd.7
osd.7 is already out.
# 因为本身没权重，ceph就不会让此节点提供服务
[root@ceph-1 ceph-deploy]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.07837 root default
-3 0.01959 host ceph-1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
-5 0.01959 host ceph-2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
4 hdd 0.00980 osd.4 up 1.00000 1.00000
-7 0.01959 host ceph-3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
-9 0.01959 host ceph-4
6 hdd 0.00980 osd.6 down 0 1.00000
7 hdd 0.00980 osd.7 down 0 1.00000
# 可以看到后面的权重为0
删除CRUSHMAP信息，默认情况下ceph osd out不会删除crush中的信息
[root@ceph-1 ceph-deploy]# ceph osd crush dump | head
{
"devices": [
{
"id": 0,
"name": "osd.0",
"class": "hdd"
},
{
"id": 1,
"name": "osd.1",
从集群里面删除这个节点的记录
[root@ceph-1 ceph-deploy]# ceph osd crush rm osd.6
removed item id 6 name 'osd.6' from crush map
[root@ceph-1 ceph-deploy]# ceph osd crush rm osd.7
removed item id 7 name 'osd.7' from crush map
# 当前ceph osd里面没有任何数据了，但是ceph集群中还有保留
[root@ceph-1 ceph-deploy]# ceph osd tree
ID CLASS WEIGHT TYPE NAME STATUS REWEIGHT PRI-AFF
-1 0.05878 root default
-3 0.01959 host ceph-1
0 hdd 0.00980 osd.0 up 1.00000 1.00000
3 hdd 0.00980 osd.3 up 1.00000 1.00000
-5 0.01959 host ceph-2
1 hdd 0.00980 osd.1 up 1.00000 1.00000
4 hdd 0.00980 osd.4 up 1.00000 1.00000
-7 0.01959 host ceph-3
2 hdd 0.00980 osd.2 up 1.00000 1.00000
5 hdd 0.00980 osd.5 up 1.00000 1.00000
-9 0 host ceph-4
6 0 osd.6 down 0 1.00000
7 0 osd.7 down 0 1.00000
# 虽然没有提供数据，但是还有存在这个节点
从集群中删除异常节点
[root@ceph-1 ceph-deploy]# ceph osd rm osd.6
removed osd.6
[root@ceph-1 ceph-deploy]# ceph osd rm osd.7
removed osd.7
[root@ceph-1 ceph-deploy]# ceph -s | grep osd
osd: 6 osds: 6 up (since 93s), 6 in (since 19m)
删除auth中的osd key
# 此时我们通过ceph -s参数还可以看到有集群状态，是因为auth中osd的key没有删除
# 通过下面的命令删除auth中的key
# 查看auth list
[root@ceph-1 ceph-deploy]# ceph auth list|grep osd
installed auth entries:
caps: [osd] allow rwx
caps: [osd] allow rwx
caps: [osd] allow rwx
osd.0
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
osd.1
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
osd.2
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
osd.3
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
osd.4
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
osd.5
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
osd.6
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
osd.7
caps: [mgr] allow profile osd
caps: [mon] allow profile osd
caps: [osd] allow *
caps: [osd] allow *
client.bootstrap-osd
caps: [mon] allow profile bootstrap-osd
caps: [osd] allow rwx
caps: [osd] allow *
caps: [osd] allow *
caps: [osd] allow *
#删除osd.6 osd.7
[root@ceph-1 ceph-deploy]# ceph auth rm osd.6
updated
[root@ceph-1 ceph-deploy]# ceph auth rm osd.7
updated
# 注意不要删除osd
# 状态恢复
[root@ceph-1 ceph-deploy]# ceph -s
cluster:
id: fb39bc5c-ac88-4b06-a580-5df5611ee976
health: HEALTH_OK
services:
mon: 3 daemons, quorum ceph-1,ceph-2,ceph-3 (age 5m)
mgr: ceph-1(active, since 17h), standbys: ceph-2, ceph-3
mds: cephfs_devopsdu:1 {0=ceph-1=up:active} 2 up:standby
osd: 6 osds: 6 up (since 5m), 6 in (since 23m)
rgw: 1 daemon active (ceph-1)
task status:
data:
pools: 10 pools, 416 pgs
objects: 2.79k objects, 10 GiB
usage: 36 GiB used, 24 GiB / 60 GiB avail
pgs: 416 active+clean
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