Setting up Trusted Storage Pools

Before you can configure a GlusterFS volume, you must create a trusted storage pool consisting of the storage servers that provides bricks to a volume.

A storage pool is a trusted network of storage servers. When you start the first server, the storage pool consists of that server alone. To add additional storage servers to the storage pool, you can use the probe command from a storage server that is already trusted.

Note: Do not self-probe the first server/localhost from itself.

The GlusterFS service must be running on all storage servers that you want to add to the storage pool. See ? for more information.

Adding Servers to Trusted Storage Pool

To create a trusted storage pool, add servers to the trusted storage pool

1. The servers used to create the storage pool must be resolvable by hostname.

   To add a server to the storage pool:

   # gluster peer probe

   For example, to create a trusted storage pool of four servers, add three servers to the storage pool from server1:

   # gluster peer probe server2
   Probe successful
   
   # gluster peer probe server3
   Probe successful
   
   # gluster peer probe server4
   Probe successful
   

2. Verify the peer status from the first server using the following commands:

   # gluster peer status
   Number of Peers: 3
   
   Hostname: server2
   Uuid: 5e987bda-16dd-43c2-835b-08b7d55e94e5
   State: Peer in Cluster (Connected)
   
   Hostname: server3
   Uuid: 1e0ca3aa-9ef7-4f66-8f15-cbc348f29ff7
   State: Peer in Cluster (Connected)
   
   Hostname: server4
   Uuid: 3e0caba-9df7-4f66-8e5d-cbc348f29ff7
   State: Peer in Cluster (Connected)
   

   1. Assign the hostname to the first server by probing it from another server (not the server used in steps 1 and 2):

      server2# gluster peer probe server1 Probe successful

3. Verify the peer status from the same server you used in step 3 using the following command:

   server2# gluster peer status
   Number of Peers: 3
   
   Hostname: server1
   Uuid: ceed91d5-e8d1-434d-9d47-63e914c93424
   State: Peer in Cluster (Connected)
   
   Hostname: server3
   Uuid: 1e0ca3aa-9ef7-4f66-8f15-cbc348f29ff7
   State: Peer in Cluster (Connected)
   
   Hostname: server4
   Uuid: 3e0caba-9df7-4f66-8e5d-cbc348f29ff7
   State: Peer in Cluster (Connected)
   

Removing Servers from the Trusted Storage Pool

To remove a server from the storage pool:

# gluster peer detach

For example, to remove server4 from the trusted storage pool:

# gluster peer detach server4
Detach successful