Longhorn 云原生容器分布式存储

内容来源于官方 Longhorn 1.1.2 英文技术手册。

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目前，您可以使用 Longhorn UI 操作 Longhorn。同时，您可以使用 Python 访问 Longhorn API，如下所示。

获取 Longhorn API 端点

与 Longhorn 通信的一种方式是通过 longhorn-frontend service。

如果您在安装 Longhorn 的同一集群中运行自动化/脚本(automation/scripting)工具，请连接到端点 http://longhorn-frontend.longhorn-system/v1

如果您在本地机器上运行自动化/脚本(automation/scripting)工具，请使用 kubectl port-forward 将 longhorn-frontend service 转发到 localhost：
```
kubectl port-forward services/longhorn-frontend 8080:http -n longhorn-system
```
并连接到端点 http://localhost:8080/v1

使用 Python Client

将 longhorn.py 文件(包含 Python client)导入到以下 Python 脚本中，并从 API 端点创建一个 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

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Longhorn 云原生容器分布式存储 - Python Client

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