第 8 章 替换 DistributedComputeHCI 节点

流程

1. 在 undercloud 上，使用 SSH 连接到您要删除的 DistributedComputeHCI 节点：

   $ ssh tripleo-admin@<dcn-computehci-node>

   Copy to Clipboard Toggle word wrap

2. 启动 cephadm shell。使用要删除的主机的站点的配置文件和密钥环文件：

   $ sudo cephadm shell --config /etc/ceph/dcn2.conf \
   --keyring /etc/ceph/dcn2.client.admin.keyring

   Copy to Clipboard Toggle word wrap

3. 记录与 DistributedComputeHCI 节点关联的 OSD （对象存储设备），您要删除以在以后的步骤中使用引用：

   [ceph: root@dcn2-computehci2-1 ~]# ceph osd tree -c /etc/ceph/dcn2.conf
   …
   -3       0.24399     host dcn2-computehci2-1
    1   hdd 0.04880         osd.1                           up  1.00000 1.00000
    7   hdd 0.04880         osd.7                           up  1.00000 1.00000
   11   hdd 0.04880         osd.11                          up  1.00000 1.00000
   15   hdd 0.04880         osd.15                          up  1.00000 1.00000
   18   hdd 0.04880         osd.18                          up  1.00000 1.00000
   …

   Copy to Clipboard Toggle word wrap

4. 使用 SSH 连接到同一集群中的另一节点，并从集群中删除该监控器：

   $ sudo cephadm shell --config /etc/ceph/dcn2.conf \
   --keyring /etc/ceph/dcn2.client.admin.keyring
   
   [ceph: root@dcn-computehci2-0]# ceph mon remove dcn2-computehci2-1 -c /etc/ceph/dcn2.conf
   removing mon.dcn2-computehci2-1 at [v2:172.23.3.153:3300/0,v1:172.23.3.153:6789/0], there will be 2 monitors

   Copy to Clipboard Toggle word wrap
5. 使用 SSH 再次登录到您要从集群中删除的节点。

6. 停止并禁用 mgr 服务：

   [tripleo-admin@dcn2-computehci2-1 ~]$ sudo systemctl --type=service | grep ceph
   ceph-crash@dcn2-computehci2-1.service    loaded active     running       Ceph crash dump collector
   ceph-mgr@dcn2-computehci2-1.service      loaded active     running       Ceph Manager
   
   [tripleo-admin@dcn2-computehci2-1 ~]$ sudo systemctl stop ceph-mgr@dcn2-computehci2-1
   
   [tripleo-admin@dcn2-computehci2-1 ~]$ sudo systemctl --type=service | grep ceph
   ceph-crash@dcn2-computehci2-1.service  loaded active running Ceph crash dump collector
   
   [tripleo-admin@dcn2-computehci2-1 ~]$ sudo systemctl disable ceph-mgr@dcn2-computehci2-1
   Removed /etc/systemd/system/multi-user.target.wants/ceph-mgr@dcn2-computehci2-1.service.

   Copy to Clipboard Toggle word wrap

7. 启动 cephadm shell：

   $ sudo cephadm shell --config /etc/ceph/dcn2.conf \
   --keyring /etc/ceph/dcn2.client.admin.keyring

   Copy to Clipboard Toggle word wrap

8. 验证该节点的 mgr 服务是否已从集群中删除：

   [ceph: root@dcn2-computehci2-1 ~]# ceph -s
   
   cluster:
       id:     b9b53581-d590-41ac-8463-2f50aa985001
       health: HEALTH_WARN
               3 pools have too many placement groups
               mons are allowing insecure global_id reclaim
   
     services:
       mon: 2 daemons, quorum dcn2-computehci2-2,dcn2-computehci2-0 (age 2h)
       mgr: dcn2-computehci2-2(active, since 20h), standbys: dcn2-computehci2-0 

   1

   
       osd: 15 osds: 15 up (since 3h), 15 in (since 3h)
   
     data:
       pools:   3 pools, 384 pgs
       objects: 32 objects, 88 MiB
       usage:   16 GiB used, 734 GiB / 750 GiB avail
       pgs:     384 active+clean

   Copy to Clipboard Toggle word wrap

   1

   当 mgr 服务成功移除时，从中删除 mgr 服务的节点将不再列出。

9. 导出 Red Hat Ceph Storage 规格：

   [ceph: root@dcn2-computehci2-1 ~]# ceph orch ls --export > spec.yml

   Copy to Clipboard Toggle word wrap

10. 编辑 spec.yaml 文件中的规格：

    • 从 spec.yml 中删除主机 <dcn-computehci-node> 的所有实例

    • 从以下内容中删除 <dcn-computehci-node> 条目的所有实例：

      • service_type: osd
      • service_type: mon
      • service_type: host

11. 重新应用 Red Hat Ceph Storage 规格：

    [ceph: root@dcn2-computehci2-1 /]# ceph orch apply -i spec.yml

    Copy to Clipboard Toggle word wrap

12. 删除您使用 ceph osd tree 来标识的 OSD：

    [ceph: root@dcn2-computehci2-1 /]# ceph orch osd rm --zap 1 7 11 15 18
    Scheduled OSD(s) for removal

    Copy to Clipboard Toggle word wrap

13. 验证正在移除的 OSD 的状态。在以下命令返回没有输出前不要继续：

    [ceph: root@dcn2-computehci2-1 /]# ceph orch osd rm status
    OSD_ID  HOST                    STATE     PG_COUNT  REPLACE  FORCE  DRAIN_STARTED_AT
    1       dcn2-computehci2-1      draining  27        False    False  2021-04-23 21:35:51.215361
    7       dcn2-computehci2-1      draining  8         False    False  2021-04-23 21:35:49.111500
    11      dcn2-computehci2-1      draining  14        False    False  2021-04-23 21:35:50.243762

    Copy to Clipboard Toggle word wrap

14. 验证您要删除的主机上没有剩余的守护进程：

    [ceph: root@dcn2-computehci2-1 /]# ceph orch ps dcn2-computehci2-1

    Copy to Clipboard Toggle word wrap

    如果守护进程仍然存在，您可以使用以下命令删除它们：

    [ceph: root@dcn2-computehci2-1 /]# ceph orch host drain dcn2-computehci2-1

    Copy to Clipboard Toggle word wrap

15. 从 Red Hat Ceph Storage 集群中删除 <dcn-computehci-node> 主机：

    [ceph: root@dcn2-computehci2-1 /]# ceph orch host rm dcn2-computehci2-1
    Removed host ‘dcn2-computehci2-1’

    Copy to Clipboard Toggle word wrap