Python Client
Currently, you can operate Longhorn using Longhorn UI. We are planning to build a dedicated Longhorn CLI in the upcoming releases.
In the meantime, you can access Longhorn API using Python binding, as we demonstrated below.
Get Longhorn endpoint
One way to communicate with Longhorn is through longhorn-frontend
service.
If you run your automation/scripting tool inside the same cluster in which Longhorn is installed, connect to the endpoint http://longhorn-frontend.longhorn-system/v1
If you run your automation/scripting tool on your local machine,
use kubectl port-forward
to forward the longhorn-frontend
service to localhost:
kubectl port-forward services/longhorn-frontend 8080:http -n longhorn-system
and connect to endpoint http://localhost:8080/v1
Using Python Client
Import file longhorn.py which contains the Python client into your Python script and create a client from the endpoint:
import longhorn
# If automation/scripting tool is inside the same cluster in which Longhorn is installed
longhorn_url = 'http://longhorn-frontend.longhorn-system/v1'
# If forwarding `longhorn-frontend` service to localhost
longhorn_url = 'http://localhost:8080/v1'
client = longhorn.Client(url=longhorn_url)
# Volume operations
# List all volumes
volumes = client.list_volume()
# Get volume by NAME/ID
testvol1 = client.by_id_volume(id="testvol1")
# Attach TESTVOL1
testvol1 = testvol1.attach(hostId="worker-1")
# Detach TESTVOL1
testvol1.detach()
# Create a snapshot of TESTVOL1 with NAME
snapshot1 = testvol1.snapshotCreate(name="snapshot1")
# Create a backup from a snapshot NAME
testvol1.snapshotBackup(name=snapshot1.name)
# Update the number of replicas of TESTVOL1
testvol1.updateReplicaCount(replicaCount=2)
# Find more examples in Longhorn integration tests https://github.com/longhorn/longhorn-tests/tree/master/manager/integration/tests
# Node operations
# List all nodes
nodes = client.list_node()
# Get node by NAME/ID
node1 = client.by_id_node(id="worker-1")
# Disable scheduling for NODE1
client.update(node1, allowScheduling=False)
# Enable scheduling for NODE1
client.update(node1, allowScheduling=True)
# Find more examples in Longhorn integration tests https://github.com/longhorn/longhorn-tests/tree/master/manager/integration/tests
# Setting operations
# List all settings
settings = client.list_setting()
# Get setting by NAME/ID
backupTargetsetting = client.by_id_setting(id="backup-target")
# Update a setting
backupTargetsetting = client.update(backupTargetsetting, value="s3://backupbucket@us-east-1/")
# Find more examples in Longhorn integration tests https://github.com/longhorn/longhorn-tests/tree/master/manager/integration/tests
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