ceph修复osd为down的情况

尝试一、直接重新激活所有osd

1、查看osd树

root@ceph01:~# ceph osd tree
ID WEIGHT  TYPE NAME       UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 0.29279 root default
-2 0.14639     host ceph01
 0 0.14639         osd.0        up  1.00000          1.00000
-3 0.14639     host ceph02
 1 0.14639         osd.1      down        0          1.00000 

发现osd.1是down掉的。

2、再次激活所有的osd(记住是所有的，不只是down掉这一个)

下面命令当中的/dev/sdb1是每一个osd节点使用的实际存储硬盘或分区。

ceph-deploy osd activate  ceph01:/dev/sdb1 ceph02:/dev/sdb1

3、查看osd树和健康状态

root@ceph01:~/my-cluster# ceph osd tree
ID WEIGHT  TYPE NAME       UP/DOWN REWEIGHT PRIMARY-AFFINITY
- 0.29279 root default
- 0.14639     host ceph01
  0.14639         osd.        up  1.00000          1.00000
- 0.14639     host ceph02
  0.14639         osd.        up  1.00000          1.00000
root@ceph01:~/my-cluster# 

root@ceph01:~/my-cluster# ceph -s
    cluster ecacda71-af9f-46f9-a2a3-a35c9e51db9e
     health HEALTH_OK
     monmap e1:  mons at {ceph01=10.111.131.125:/}
            election epoch , quorum  ceph01
     osdmap e150:  osds:  up,  in
            flags sortbitwise,require_jewel_osds
      pgmap v9284:  pgs,  pools,  bytes data,  objects
             MB used,  GB /  GB avail
                   active+clean

只有为 HEALTH_OK 才算是正常的。

尝试二、修复down掉的osd

该方法主要应用于某个osd物理损坏，导致激活不了

1、查看osd树

root@ceph01:~# ceph osd tree
ID WEIGHT  TYPE NAME       UP/DOWN REWEIGHT PRIMARY-AFFINITY
- 0.29279 root default
- 0.14639     host ceph01
  0.14639         osd.        up  1.00000          1.00000
- 0.14639     host ceph02
  0.14639         osd.      down                  1.00000 

发现osd.1是down掉的。

2、将osd.1的状态设置为out

root@ceph02:~# ceph osd out osd.
osd. is already out. 

3、从集群中删除

root@ceph02:~# ceph osd rm osd.
removed osd.

4、从CRUSH中删除

root@ceph02:~# ceph osd crush rm osd.
removed item id  name 'osd.1' from crush map

5、删除osd.1的认证信息

root@ceph02:~# ceph auth del osd.
updated

6、umount

umount /dev/sdb1

7、再次查看osd的集群状态

root@ceph02:~# ceph osd tree
ID WEIGHT  TYPE NAME       UP/DOWN REWEIGHT PRIMARY-AFFINITY
- 0.14639 root default
- 0.14639     host ceph01
  0.14639         osd.        up  1.00000          1.00000
-            host ceph02    

8、登录ceph-deploy节点

root@ceph01:~# cd /root/my-cluster/
root@ceph01:~/my-cluster# 

9、初始化磁盘

ceph-deploy --overwrite-conf osd  prepare ceph02:/dev/sdb1

10、再次激活所有的osd(记住是所有的，不只是down掉这一个)

ceph-deploy osd activate  ceph01:/dev/sdb1 ceph02:/dev/sdb1

11、查看osd树和健康状态

root@ceph01:~/my-cluster# ceph osd tree
ID WEIGHT  TYPE NAME       UP/DOWN REWEIGHT PRIMARY-AFFINITY
-1 0.29279 root default
-2 0.14639     host ceph01
 0 0.14639         osd.0        up  1.00000          1.00000
-3 0.14639     host ceph02
 1 0.14639         osd.1        up  1.00000          1.00000
root@ceph01:~/my-cluster# 

root@ceph01:~/my-cluster# ceph -s
    cluster ecacda71-af9f-46f9-a2a3-a35c9e51db9e
     health HEALTH_OK
     monmap e1: 1 mons at {ceph01=10.111.131.125:6789/0}
            election epoch 14, quorum 0 ceph01
     osdmap e150: 2 osds: 2 up, 2 in
            flags sortbitwise,require_jewel_osds
      pgmap v9284: 64 pgs, 1 pools, 17 bytes data, 3 objects
            10310 MB used, 289 GB / 299 GB avail
                  64 active+clean

只有为 HEALTH_OK 才算是正常的。