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GlusterFS 6 : ノードを削除する
2019/10/08
 
既存のクラスターからノードを削除する場合の設定です。
例として、リンク先の通り構築した分散構成のクラスターから [node03] を削除します。
                                  |
+----------------------+          |          +----------------------+
| [GlusterFS Server#1] |10.0.0.51 | 10.0.0.52| [GlusterFS Server#2] |
|   node01.srv.world   +----------+----------+   node02.srv.world   |
|                      |          |          |                      |
+----------------------+          |          +----------------------+
           ⇑                      |                      ⇑
     file1, file3 ...             |               file2, file4 ...
                                  |
+----------------------+          |
| [GlusterFS Server#3] |10.0.0.53 |
|   node03.srv.world   +----------+
|                      |
+----------------------+

[1] 削除対象ノードを除く、既存ノードのいずれかのノードで、ノード削除の設定をします。
# ボリューム情報確認

[root@node01 ~]#
gluster volume info


Volume Name: vol_distributed
Type: Distribute
Volume ID: 88f71e9f-d509-44c2-a62f-9524bba93fe5
Status: Started
Snapshot Count: 0
Number of Bricks: 3
Transport-type: tcp
Bricks:
Brick1: node01:/glusterfs/distributed
Brick2: node02:/glusterfs/distributed
Brick3: node03:/glusterfs/distributed
Options Reconfigured:
transport.address-family: inet
nfs.disable: on

# ボリュームから対象ノードの削除を開始

# ボリュームのリバランスも自動で実施される

[root@node01 ~]#
gluster volume remove-brick vol_distributed node03:/glusterfs/distributed start

Running remove-brick with cluster.force-migration enabled can result in data corruption. 
It is safer to disable this option so that files that receive writes during migration are not migrated.
Files that are not migrated can then be manually copied after the remove-brick commit operation.
Do you want to continue with your current cluster.force-migration settings? (y/n) y
volume remove-brick start: success
ID: 305e01a7-4bab-4398-b65f-bf01949a2d20

# 進行状況確認

[root@node01 ~]#
gluster volume remove-brick vol_distributed node03:/glusterfs/distributed status


     Node Rebalanced-files          size       scanned      failures       skipped               status  run time in h:m:s
---------      -----------   -----------   -----------   -----------   -----------         ------------     --------------
   node03                1        6Bytes             1             0             0            completed        0:00:00

# 進行状況確認の結果 [status] が [completed] の後、削除実行をコミットする

[root@node01 ~]#
gluster volume remove-brick vol_distributed node03:/glusterfs/distributed commit

volume remove-brick commit: success
Check the removed bricks to ensure all files are migrated.
If files with data are found on the brick path, copy them via a gluster mount point before re-purposing the removed brick.

# ボリューム情報確認

[root@node01 ~]#
gluster volume info


Volume Name: vol_distributed
Type: Distribute
Volume ID: 88f71e9f-d509-44c2-a62f-9524bba93fe5
Status: Started
Snapshot Count: 0
Number of Bricks: 2
Transport-type: tcp
Bricks:
Brick1: node01:/glusterfs/distributed
Brick2: node02:/glusterfs/distributed
Options Reconfigured:
performance.client-io-threads: on
transport.address-family: inet
nfs.disable: on
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