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github-actions[bot] edited this page Mar 12, 2026 · 22 revisions

API Reference

All endpoints are served at http://<host>:8080. The API is JSON-over-HTTP; all request and response bodies are application/json.

Endpoint overview

Method Path Description
GET /api/sysinfo Host and process info
GET /api/version OpenZFS version string
GET /api/pools List all pools with usage stats
GET /api/poolstatus Detailed pool status with vdev tree
GET /api/datasets List all datasets and volumes
GET /api/dataset-props/{name} Editable properties for a dataset
GET /api/snapshots List all snapshots
GET /api/iostat Pool I/O statistics (1-second sample)
GET /api/smart S.M.A.R.T. health per disk
GET /api/events Server-Sent Events stream
GET /metrics Prometheus text exposition
POST /api/datasets Create a dataset or volume
PATCH /api/datasets/{name} Update dataset properties
DELETE /api/datasets/{name} Destroy a dataset or volume
POST /api/snapshots Create a snapshot
DELETE /api/snapshots/{name} Destroy a snapshot
GET /api/users List local users
POST /api/users Create a local user
PUT /api/users/{name} Edit user (shell, groups, password)
DELETE /api/users/{name} Delete user and home directory
GET /api/groups List local groups
POST /api/groups Create a local group
PUT /api/groups/{name} Edit group (name, GID, members)
DELETE /api/groups/{name} Delete a local group
GET /api/chown/{dataset} Get mountpoint owner and group
POST /api/chown/{dataset} Set mountpoint owner and/or group
GET /api/acl-status ACL presence map (dataset → bool)
GET /api/acl/{dataset} Get ACL entries for a dataset
POST /api/acl/{dataset} Add or modify an ACL entry
DELETE /api/acl/{dataset} Remove an ACL entry
GET /api/smb-shares List active Samba usershares
POST /api/smb-share/{dataset} Create or update a Samba usershare
DELETE /api/smb-share/{dataset} Remove a Samba usershare
GET /api/smb-users List users registered in smbpasswd
POST /api/smb-users/{name} Add a user to smbpasswd
DELETE /api/smb-users/{name} Remove a user from smbpasswd
POST /api/smb-config/pam Run Samba setup playbook
POST /api/scrub/{pool} Start a pool scrub
DELETE /api/scrub/{pool} Cancel a running pool scrub

Datasets

POST /api/datasets

Create a filesystem or volume.

{
  "name": "tank/data",
  "type": "filesystem",
  "compression": "lz4",
  "quota": "50G",
  "mountpoint": "/mnt/data",
  "recordsize": "128K",
  "atime": "off",
  "exec": "on",
  "sync": "standard",
  "dedup": "off",
  "copies": "1",
  "xattr": "sa"
}

For volumes, use "type": "volume" and add "volsize": "10G". Optional: "volblocksize", "sparse": true.

PATCH /api/datasets/{name}

Update dataset properties. Any subset of editable properties may be sent. An empty string value resets the property to inherited; a non-empty value sets it explicitly. Unknown properties are ignored.

{
  "compression": "zstd",
  "quota": "",
  "readonly": "on"
}

Editable properties: compression, quota, mountpoint, recordsize, atime, exec, sync, dedup, copies, xattr, readonly, acltype, sharenfs, sharesmb.

DELETE /api/datasets/{name}

Destroy a dataset or volume. Append ?recursive=true to also destroy all child datasets and snapshots.

Pool roots (e.g. tank) cannot be deleted via this endpoint — use zpool destroy.

Snapshots

POST /api/snapshots

{
  "dataset": "tank/data",
  "snapname": "2024-01-15_backup",
  "recursive": false
}

DELETE /api/snapshots/{dataset}@{snapname}

Append ?recursive=true to also destroy clones.

Pool scrub

POST /api/scrub/{pool}

Start a scrub on the named pool. Returns Ansible task steps.

DELETE /api/scrub/{pool}

Cancel a running scrub on the named pool. Returns Ansible task steps.

ACLs

GET /api/acl/{dataset}

Returns the ACL type and entries for the dataset's mountpoint.

{
  "dataset": "tank/data",
  "mountpoint": "/mnt/data",
  "acl_type": "posix",
  "entries": [
    { "tag": "user",  "qualifier": "",      "perms": "rwx", "default": false },
    { "tag": "user",  "qualifier": "alice", "perms": "r-x", "default": false },
    { "tag": "group", "qualifier": "",      "perms": "r-x", "default": false },
    { "tag": "mask",  "qualifier": "",      "perms": "rwx", "default": false },
    { "tag": "other", "qualifier": "",      "perms": "---", "default": false }
  ]
}

acl_type is one of "posix", "nfsv4", or "off".

For NFSv4 datasets each entry has the form:

{ "tag": "A", "flags": "fd", "qualifier": "OWNER@", "perms": "rwaDxtTnNcCoy" }

POST /api/acl/{dataset}

Add or modify an ACL entry. The ace string format depends on the dataset's acltype:

  • POSIX: setfacl -m spec — "user:alice:rwx", "group:storage:r-x", "default:user:alice:rwx"
  • NFSv4: full ACE string — "A::alice@localdomain:rwaDxtTnNcCoy" 
{ "ace": "user:alice:rwx", "recursive": false }

recursive (POSIX only) applies setfacl -R to all files inside the mountpoint.

DELETE /api/acl/{dataset}?entry=<spec>

Remove an ACL entry. The entry query parameter:

  • POSIX: user:alice, default:group:storage
  • NFSv4: full ACE string to match

Append &recursive=true (POSIX only) to remove recursively.

Server-Sent Events

GET /api/events

Subscribe to live data updates. The server pushes named events whenever data changes.

Query parameter: topics — comma-separated list of topics to subscribe to.

Available topics:

Topic Data Cadence
pool.query Same JSON as GET /api/pools Every 10 s on change
poolstatus Same JSON as GET /api/poolstatus Every 10 s on change
dataset.query Same JSON as GET /api/datasets Every 10 s on change
snapshot.query Same JSON as GET /api/snapshots Every 10 s on change
iostat Same JSON as GET /api/iostat Every 10 s
user.query Same JSON as GET /api/users Every 10 s on change + after writes
group.query Same JSON as GET /api/groups Every 10 s on change + after writes
ansible.progress Single TaskStep object Streamed during playbook run 
event: pool.query
data: [{"name":"tank","health":"ONLINE",...}]

event: iostat
data: [{"pool":"tank","read_ops":0,"write_ops":443,...}]

Example — watch pool health and I/O live:

curl -N 'http://localhost:8080/api/events?topics=pool.query,iostat'

Error responses

Non-2xx responses return:

{
  "error": "human-readable message",
  "tasks": [ ... ]
}

tasks is populated for Ansible-backed operations and contains the step results up to the point of failure.

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