Longhorn 雲原生容器分散式儲存 - Python Client

為少發表於2021-09-03
分散式Pythonclient

內容來源於官方 Longhorn 1.1.2 英文技術手冊。

系列

目前，您可以使用 Longhorn UI 操作 Longhorn。同時，您可以使用 Python 訪問 Longhorn API，如下所示。

  1. 獲取 Longhorn API 端點

    與 Longhorn 通訊的一種方式是通過 longhorn-frontend service。

    如果您在安裝 Longhorn 的同一叢集中執行自動化/指令碼(automation/scripting)工具，請連線到端點 http://longhorn-frontend.longhorn-system/v1

    如果您在本地機器上執行自動化/指令碼(automation/scripting)工具，請使用 kubectl port-forward 將 longhorn-frontend service 轉發到 localhost：

    kubectl port-forward services/longhorn-frontend 8080:http -n longhorn-system

    並連線到端點 http://localhost:8080/v1

  2. 使用 Python Client

    將 longhorn.py 檔案(包含 Python client)匯入到以下 Python 指令碼中，並從 API 端點建立一個 client：

    https://github.com/longhorn/longhorn-tests/blob/master/manager/integration/tests/longhorn.py

    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

公眾號：黑客下午茶

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