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Chapter 6. Operations on a Red Hat Gluster Storage Pod in an OpenShift Environment

This chapter lists out the various operations that can be performed on a Red Hat Gluster Storage pod (gluster pod):
  1. To list the pods, execute the following command : 
    # oc get pods
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    For example: 
    # oc get pods
NAME                                                     READY     STATUS    RESTARTS   AGE
storage-project-router-1-v89qc                           1/1       Running   0          1d
glusterfs-dc-node1.example.com                           1/1       Running   0          1d
glusterfs-dc-node2.example.com                           1/1       Running   1          1d
glusterfs-dc-node3.example.com                           1/1       Running   0          1d
heketi-1-k1u14                                           1/1       Running   0          23m
rhel1                                                    1/1       Running   0          26s
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    Following are the gluster pods from the above example: 
    glusterfs-dc-node1.example.com                           
glusterfs-dc-node2.example.com                           
glusterfs-dc-node3.example.com
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    Note

    The topology.json file will provide the details of the nodes in a given Trusted Storage Pool (TSP) . In the above example all the 3 Red Hat Gluster Storage nodes are from the same TSP.
  2. To enter the gluster pod shell, execute the following command: 
    # oc rsh <gluster_pod_name>
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    For example: 
    # oc rsh glusterfs-dc-node1.example.com

sh-4.2#
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  3. To get the peer status, execute the following command: 
    # gluster peer status
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    For example: 
    # gluster peer status

Number of Peers: 2

Hostname: node2.example.com
Uuid: 9f3f84d2-ef8e-4d6e-aa2c-5e0370a99620
State: Peer in Cluster (Connected)
Other names:
node1.example.com

Hostname: node3.example.com
Uuid: 38621acd-eb76-4bd8-8162-9c2374affbbd
State: Peer in Cluster (Connected)
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  4. To list the gluster volumes on the Trusted Storage Pool, execute the following command: 
    # gluster volume info
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    For example: 
    Volume Name: heketidbstorage
Type: Distributed-Replicate
Volume ID: 2fa53b28-121d-4842-9d2f-dce1b0458fda
Status: Started
Number of Bricks: 2 x 3 = 6
Transport-type: tcp
Bricks:
Brick1: 192.168.121.172:/var/lib/heketi/mounts/vg_1be433737b71419dc9b395e221255fb3/brick_c67fb97f74649d990c5743090e0c9176/brick
Brick2: 192.168.121.233:/var/lib/heketi/mounts/vg_0013ee200cdefaeb6dfedd28e50fd261/brick_6ebf1ee62a8e9e7a0f88e4551d4b2386/brick
Brick3: 192.168.121.168:/var/lib/heketi/mounts/vg_e4b32535c55c88f9190da7b7efd1fcab/brick_df5db97aa002d572a0fec6bcf2101aad/brick
Brick4: 192.168.121.233:/var/lib/heketi/mounts/vg_0013ee200cdefaeb6dfedd28e50fd261/brick_acc82e56236df912e9a1948f594415a7/brick
Brick5: 192.168.121.168:/var/lib/heketi/mounts/vg_e4b32535c55c88f9190da7b7efd1fcab/brick_65dceb1f749ec417533ddeae9535e8be/brick
Brick6: 192.168.121.172:/var/lib/heketi/mounts/vg_7ad961dbd24e16d62cabe10fd8bf8909/brick_f258450fc6f025f99952a6edea203859/brick
Options Reconfigured:
performance.readdir-ahead: on
 
Volume Name: vol_9e86c0493f6b1be648c9deee1dc226a6
Type: Distributed-Replicate
Volume ID: 940177c3-d866-4e5e-9aa0-fc9be94fc0f4
Status: Started
Number of Bricks: 2 x 3 = 6
Transport-type: tcp
Bricks:
Brick1: 192.168.121.168:/var/lib/heketi/mounts/vg_3fa141bf2d09d30b899f2f260c494376/brick_9fb4a5206bdd8ac70170d00f304f99a5/brick
Brick2: 192.168.121.172:/var/lib/heketi/mounts/vg_7ad961dbd24e16d62cabe10fd8bf8909/brick_dae2422d518915241f74fd90b426a379/brick
Brick3: 192.168.121.233:/var/lib/heketi/mounts/vg_5c6428c439eb6686c5e4cee56532bacf/brick_b3768ba8e80863724c9ec42446ea4812/brick
Brick4: 192.168.121.172:/var/lib/heketi/mounts/vg_7ad961dbd24e16d62cabe10fd8bf8909/brick_0a13958525c6343c4a7951acec199da0/brick
Brick5: 192.168.121.168:/var/lib/heketi/mounts/vg_17fbc98d84df86756e7826326fb33aa4/brick_af42af87ad87ab4f01e8ca153abbbee9/brick
Brick6: 192.168.121.233:/var/lib/heketi/mounts/vg_5c6428c439eb6686c5e4cee56532bacf/brick_ef41e04ca648efaf04178e64d25dbdcb/brick
Options Reconfigured:
performance.readdir-ahead: on
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  5. To get the volume status, execute the following command: 
    # gluster volume status <volname>
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    For example: 
    # gluster volume status vol_9e86c0493f6b1be648c9deee1dc226a6

Status of volume: vol_9e86c0493f6b1be648c9deee1dc226a6
Gluster process                             TCP Port  RDMA Port  Online  Pid
------------------------------------------------------------------------------
Brick 192.168.121.168:/var/lib/heketi/mounts/v
g_3fa141bf2d09d30b899f2f260c494376/brick_9f
b4a5206bdd8ac70170d00f304f99a5/brick        49154     0          Y       3462
Brick 192.168.121.172:/var/lib/heketi/mounts/v
g_7ad961dbd24e16d62cabe10fd8bf8909/brick_da
e2422d518915241f74fd90b426a379/brick        49154     0          Y       115939
Brick 192.168.121.233:/var/lib/heketi/mounts/v
g_5c6428c439eb6686c5e4cee56532bacf/brick_b3
768ba8e80863724c9ec42446ea4812/brick        49154     0          Y       116134
Brick 192.168.121.172:/var/lib/heketi/mounts/v
g_7ad961dbd24e16d62cabe10fd8bf8909/brick_0a
13958525c6343c4a7951acec199da0/brick        49155     0          Y       115958
Brick 192.168.121.168:/var/lib/heketi/mounts/v
g_17fbc98d84df86756e7826326fb33aa4/brick_af
42af87ad87ab4f01e8ca153abbbee9/brick        49155     0          Y       3481
Brick 192.168.121.233:/var/lib/heketi/mounts/v
g_5c6428c439eb6686c5e4cee56532bacf/brick_ef
41e04ca648efaf04178e64d25dbdcb/brick        49155     0          Y       116153
NFS Server on localhost                     2049      0          Y       116173
Self-heal Daemon on localhost               N/A       N/A        Y       116181
NFS Server on node1.example.com                                        2049      0          Y       3501
Self-heal Daemon on node1.example.com                                  N/A       N/A        Y       3509
NFS Server on 192.168.121.172                  2049      0          Y       115978
Self-heal Daemon on 192.168.121.172            N/A       N/A        Y       115986
 
Task Status of Volume vol_9e86c0493f6b1be648c9deee1dc226a6
------------------------------------------------------------------------------
There are no active volume tasks
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  6. To take the snapshot of the gluster volume, execute the following command: 
    # gluster snapshot create <snapname> <volname>
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    For example: 
    # gluster snapshot create snap1 vol_9e86c0493f6b1be648c9deee1dc226a6

snapshot create: success: Snap snap1_GMT-2016.07.29-13.05.46 created successfully
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  7. To list the snapshots, execute the following command: 
    # gluster snapshot list
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    For example: 
    # gluster snapshot list

snap1_GMT-2016.07.29-13.05.46
snap2_GMT-2016.07.29-13.06.13
snap3_GMT-2016.07.29-13.06.18
snap4_GMT-2016.07.29-13.06.22
snap5_GMT-2016.07.29-13.06.26
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  8. To delete a snapshot, execute the following command: 
    # gluster snap delete <snapname>
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    For example: 
    # gluster snap delete snap1_GMT-2016.07.29-13.05.46

Deleting snap will erase all the information about the snap. Do you still want to continue? (y/n) y
snapshot delete: snap1_GMT-2016.07.29-13.05.46: snap removed successfully
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    For more information about managing snapshots, refer https://access.redhat.com/documentation/en-US/Red_Hat_Storage/3.1/html-single/Administration_Guide/index.html#chap-Managing_Snapshots.
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