CentOS 8
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GlusterFS 6 : Distributed + Replication
2019/10/09
 
Configure Storage Clustering with GlusterFS.
For example, Create a Distributed + Replication volume with 6 Nodes.
Also Configure Arbiter Volume in order to avoid Split Brain.
                                  |
+----------------------+          |          +----------------------+
| [GlusterFS Server#1] |10.0.0.51 | 10.0.0.54| [GlusterFS Server#4] |
|   node01.srv.world   +----------+----------+   node04.srv.world   |
|                      |          |          |                      |
+----------------------+          |          +----------------------+
                                  |
+----------------------+          |          +----------------------+
| [GlusterFS Server#2] |10.0.0.52 | 10.0.0.55| [GlusterFS Server#5] |
|   node02.srv.world   +----------+----------+   node05.srv.world   |
|                      |          |          |                      |
+----------------------+          |          +----------------------+
                                  |
+----------------------+          |          +----------------------+
| [GlusterFS Server#3] |10.0.0.53 | 10.0.0.56| [GlusterFS Server#6] |
|   node03.srv.world   +----------+----------+   node06.srv.world   |
|                      |                     |                      |
+----------------------+                     +----------------------+
           ⇑                                             ⇑
     file1, file3 ...                             file2, file4 ...

 
It is strongly recommended to use partitions for GlusterFS volumes that are different from the / partition.
On this example, it shows settings on the environment that all nodes has [sdb1] and mount it to [/glusterfs].
[1]
[2] Create a Directory for GlusterFS Volume on all Nodes.
[root@node01 ~]#
mkdir -p /glusterfs/dist-replica

[3] Configure Clustering like follows on a node. (it's OK on any node)
# probe the node

[root@node01 ~]#
gluster peer probe node02

peer probe: success.
[root@node01 ~]#
gluster peer probe node03

peer probe: success.
[root@node01 ~]#
gluster peer probe node04

peer probe: success.
[root@node01 ~]#
gluster peer probe node05

peer probe: success.
[root@node01 ~]#
gluster peer probe node06

peer probe: success.
# confirm status

[root@node01 ~]#
gluster peer status

Number of Peers: 5

Hostname: node02
Uuid: d438d612-77f3-4802-9978-336aa722f796
State: Peer in Cluster (Connected)

Hostname: node03
Uuid: 1f24dd87-c20e-4e14-b6e1-36a7f8b0f360
State: Peer in Cluster (Connected)

Hostname: node04
Uuid: 6d72354c-75ca-4eba-b987-f7bde7da8393
State: Peer in Cluster (Connected)

Hostname: node05
Uuid: 3de23920-aa37-4371-9b1a-7b52af8a3331
State: Peer in Cluster (Connected)

Hostname: node06
Uuid: b61a6b48-98eb-4050-ad9e-63b0b832ba24
State: Peer in Cluster (Connected)

# create volume

[root@node01 ~]#
gluster volume create vol_dist-replica replica 3 arbiter 1 transport tcp \
node01:/glusterfs/dist-replica \
node02:/glusterfs/dist-replica \
node03:/glusterfs/dist-replica \
node04:/glusterfs/dist-replica \
node05:/glusterfs/dist-replica \
node06:/glusterfs/dist-replica

volume create: vol_dist-replica: success: please start the volume to access data
# start volume

[root@node01 ~]#
gluster volume start vol_dist-replica

volume start: vol_dist-replica: success
# confirm volume info

[root@node01 ~]#
gluster volume info


Volume Name: vol_dist-replica
Type: Distributed-Replicate
Volume ID: 656e04be-069f-47ec-8762-6b8e1dc632a0
Status: Started
Snapshot Count: 0
Number of Bricks: 2 x (2 + 1) = 6
Transport-type: tcp
Bricks:
Brick1: node01:/glusterfs/dist-replica
Brick2: node02:/glusterfs/dist-replica
Brick3: node03:/glusterfs/dist-replica (arbiter)
Brick4: node04:/glusterfs/dist-replica
Brick5: node05:/glusterfs/dist-replica
Brick6: node06:/glusterfs/dist-replica (arbiter)
Options Reconfigured:
transport.address-family: inet
nfs.disable: on
performance.client-io-threads: off
[4]
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