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---
layout: api
page_title: Operator - HTTP API
sidebar_current: api-operator
description: |-
The /operator endpoints provides cluster-level tools for Nomad operators, such
as interacting with the Raft subsystem.
---
# /v1/operator
The `/operator` endpoint provides cluster-level tools for Nomad operators, such
as interacting with the Raft subsystem.
~> Use this interface with extreme caution, as improper use could lead to a
Nomad outage and even loss of data.
See the [Outage Recovery](/guides/operations/outage.html) guide for some examples of how
these capabilities are used. For a CLI to perform these operations manually,
please see the documentation for the
[`nomad operator`](/docs/commands/operator.html) command.
## Read Raft Configuration
This endpoint queries the status of a client node registered with Nomad.
| Method | Path | Produces |
| ------ | --------------------------------- | -------------------------- |
| `GET` | `/v1/operator/raft/configuration` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries) and
[required ACLs](/api/index.html#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `management` |
### Parameters
- `stale` - Specifies if the cluster should respond without an active leader.
This is specified as a query string parameter.
### Sample Request
```text
$ curl \
https://localhost:4646/v1/operator/raft/configuration
```
### Sample Response
```json
{
"Index": 1,
"Servers": [
{
"Address": "127.0.0.1:4647",
"ID": "127.0.0.1:4647",
"Leader": true,
"Node": "bacon-mac.global",
"RaftProtocol": 2,
"Voter": true
}
]
}
```
#### Field Reference
- `Index` `(int)` - The `Index` value is the Raft corresponding to this
configuration. The latest configuration may not yet be committed if changes
are in flight.
- `Servers` `(array: Server)` - The returned `Servers` array has information
about the servers in the Raft peer configuration.
- `ID` `(string)` - The ID of the server. This is the same as the `Address`
but may be upgraded to a GUID in a future version of Nomad.
- `Node` `(string)` - The node name of the server, as known to Nomad, or
`"(unknown)"` if the node is stale and not known.
- `Address` `(string)` - The `ip:port` for the server.
- `Leader` `(bool)` - is either "true" or "false" depending on the server's
role in the Raft configuration.
- `Voter` `(bool)` - is "true" or "false", indicating if the server has a vote
in the Raft configuration. Future versions of Nomad may add support for
non-voting servers.
## Remove Raft Peer
This endpoint removes a Nomad server with given address from the Raft
configuration. The return code signifies success or failure.
| Method | Path | Produces |
| -------- | ---------------------------| -------------------------- |
| `DELETE` | `/v1/operator/raft/peer` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries) and
[required ACLs](/api/index.html#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `management` |
### Parameters
- `address` `(string: <optional>)` - Specifies the server to remove as
`ip:port`. This cannot be provided along with the `id` parameter.
- `id` `(string: <optional>)` - Specifies the server to remove as
`id`. This cannot be provided along with the `address` parameter.
### Sample Request
```text
$ curl \
--request DELETE \
https://localhost:4646/v1/operator/raft/peer?address=1.2.3.4
```
## Read Autopilot Configuration
This endpoint retrieves its latest Autopilot configuration.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/v1/operator/autopilot/configuration` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries) and
[required ACLs](/api/index.html#acls).
| Blocking Queries | ACL Required |
| ---------------- | --------------- |
| `NO` | `operator:read` |
### Sample Request
```text
$ curl \
https://localhost:4646/v1/operator/autopilot/configuration
```
### Sample Response
```json
{
"CleanupDeadServers": true,
"LastContactThreshold": "200ms",
"MaxTrailingLogs": 250,
"ServerStabilizationTime": "10s",
"EnableRedundancyZones": false,
"DisableUpgradeMigration": false,
"EnableCustomUpgrades": false,
"CreateIndex": 4,
"ModifyIndex": 4
}
```
For more information about the Autopilot configuration options, see the
[agent configuration section](/docs/configuration/autopilot.html).
## Update Autopilot Configuration
This endpoint updates the Autopilot configuration of the cluster.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `PUT` | `/v1/operator/autopilot/configuration` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries) and
[required ACLs](/api/index.html#acls).
| Blocking Queries | ACL Required |
| ---------------- | ---------------- |
| `NO` | `operator:write` |
### Parameters
- `cas` `(int: 0)` - Specifies to use a Check-And-Set operation. The update will
only happen if the given index matches the `ModifyIndex` of the configuration
at the time of writing.
### Sample Payload
```json
{
"CleanupDeadServers": true,
"LastContactThreshold": "200ms",
"MaxTrailingLogs": 250,
"ServerStabilizationTime": "10s",
"EnableRedundancyZones": false,
"DisableUpgradeMigration": false,
"EnableCustomUpgrades": false,
"CreateIndex": 4,
"ModifyIndex": 4
}
```
- `CleanupDeadServers` `(bool: true)` - Specifies automatic removal of dead
server nodes periodically and whenever a new server is added to the cluster.
- `LastContactThreshold` `(string: "200ms")` - Specifies the maximum amount of
time a server can go without contact from the leader before being considered
unhealthy. Must be a duration value such as `10s`.
- `MaxTrailingLogs` `(int: 250)` specifies the maximum number of log entries
that a server can trail the leader by before being considered unhealthy.
- `ServerStabilizationTime` `(string: "10s")` - Specifies the minimum amount of
time a server must be stable in the 'healthy' state before being added to the
cluster. Only takes effect if all servers are running Raft protocol version 3
or higher. Must be a duration value such as `30s`.
- `EnableRedundancyZones` `(bool: false)` - (Enterprise-only) Specifies whether
to enable redundancy zones.
- `DisableUpgradeMigration` `(bool: false)` - (Enterprise-only) Disables Autopilot's
upgrade migration strategy in Nomad Enterprise of waiting until enough
newer-versioned servers have been added to the cluster before promoting any of
them to voters.
- `EnableCustomUpgrades` `(bool: false)` - (Enterprise-only) Specifies whether to
enable using custom upgrade versions when performing migrations.
## Read Health
This endpoint queries the health of the autopilot status.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/v1/operator/autopilot/health` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries) and
[required ACLs](/api/index.html#acls).
| Blocking Queries | ACL Required |
| ---------------- | --------------- |
| `NO` | `operator:read` |
### Sample Request
```text
$ curl \
https://localhost:4646/v1/operator/autopilot/health
```
### Sample response
```json
{
"Healthy": true,
"FailureTolerance": 0,
"Servers": [
{
"ID": "e349749b-3303-3ddf-959c-b5885a0e1f6e",
"Name": "node1",
"Address": "127.0.0.1:8300",
"SerfStatus": "alive",
"Version": "0.8.0",
"Leader": true,
"LastContact": "0s",
"LastTerm": 2,
"LastIndex": 46,
"Healthy": true,
"Voter": true,
"StableSince": "2017-03-06T22:07:51Z"
},
{
"ID": "e36ee410-cc3c-0a0c-c724-63817ab30303",
"Name": "node2",
"Address": "127.0.0.1:8205",
"SerfStatus": "alive",
"Version": "0.8.0",
"Leader": false,
"LastContact": "27.291304ms",
"LastTerm": 2,
"LastIndex": 46,
"Healthy": true,
"Voter": false,
"StableSince": "2017-03-06T22:18:26Z"
}
]
}
```
- `Healthy` is whether all the servers are currently healthy.
- `FailureTolerance` is the number of redundant healthy servers that could be
fail without causing an outage (this would be 2 in a healthy cluster of 5
servers).
- `Servers` holds detailed health information on each server:
- `ID` is the Raft ID of the server.
- `Name` is the node name of the server.
- `Address` is the address of the server.
- `SerfStatus` is the SerfHealth check status for the server.
- `Version` is the Nomad version of the server.
- `Leader` is whether this server is currently the leader.
- `LastContact` is the time elapsed since this server's last contact with the leader.
- `LastTerm` is the server's last known Raft leader term.
- `LastIndex` is the index of the server's last committed Raft log entry.
- `Healthy` is whether the server is healthy according to the current Autopilot configuration.
- `Voter` is whether the server is a voting member of the Raft cluster.
- `StableSince` is the time this server has been in its current `Healthy` state.
The HTTP status code will indicate the health of the cluster. If `Healthy` is true, then a
status of 200 will be returned. If `Healthy` is false, then a status of 429 will be returned.
## Read Scheduler Configuration
This endpoint retrieves the latest Scheduler configuration. This API was introduced in
Nomad 0.9 and currently supports enabling/disabling preemption. More options may be added in
the future.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `GET` | `/v1/operator/scheduler/configuration` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries) and
[required ACLs](/api/index.html#acls).
| Blocking Queries | ACL Required |
| ---------------- | --------------- |
| `NO` | `operator:read` |
### Sample Request
```text
$ curl \
https://localhost:4646/v1/operator/scheduler/configuration
```
### Sample Response
```json
{
"Index": 5,
"KnownLeader": true,
"LastContact": 0,
"SchedulerConfig": {
"CreateIndex": 5,
"ModifyIndex": 5,
"PreemptionConfig": {
"SystemSchedulerEnabled": true,
"BatchSchedulerEnabled": false,
"ServiceSchedulerEnabled": false
}
}
}
```
#### Field Reference
- `Index` `(int)` - The `Index` value is the Raft commit index corresponding to this
configuration.
- `SchedulerConfig` `(SchedulerConfig)` - The returned `SchedulerConfig` object has configuration
settings mentioned below.
- `PreemptionConfig` `(PreemptionConfig)` - Options to enable preemption for various schedulers.
- `SystemSchedulerEnabled` `(bool: true)` - Specifies whether preemption for system jobs is enabled. Note that
this defaults to true.
- `BatchSchedulerEnabled` `(bool: false)` (Enterprise Only) - Specifies whether preemption for batch jobs is enabled. Note that
this defaults to false and must be explicitly enabled.
- `ServiceSchedulerEnabled` `(bool: false)` (Enterprise Only) - Specifies whether preemption for service jobs is enabled. Note that
this defaults to false and must be explicitly enabled.
- `CreateIndex` - The Raft index at which the config was created.
- `ModifyIndex` - The Raft index at which the config was modified.
## Update Scheduler Configuration
This endpoint updates the scheduler configuration of the cluster.
| Method | Path | Produces |
| ------ | ---------------------------- | -------------------------- |
| `PUT`, `POST` | `/v1/operator/scheduler/configuration` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/api/index.html#blocking-queries) and
[required ACLs](/api/index.html#acls).
| Blocking Queries | ACL Required |
| ---------------- | ---------------- |
| `NO` | `operator:write` |
### Parameters
- `cas` `(int: 0)` - Specifies to use a Check-And-Set operation. The update will
only happen if the given index matches the `ModifyIndex` of the configuration
at the time of writing.
### Sample Payload
```json
{
"PreemptionConfig": {
"SystemSchedulerEnabled": true,
"BatchSchedulerEnabled": false,
"ServiceSchedulerEnabled": true
}
}
```
- `PreemptionConfig` `(PreemptionConfig)` - Options to enable preemption for various schedulers.
- `SystemSchedulerEnabled` `(bool: true)` - Specifies whether preemption for system jobs is enabled. Note that
if this is set to true, then system jobs can preempt any other jobs.
- `BatchSchedulerEnabled` `(bool: false)` (Enterprise Only) - Specifies whether preemption for batch jobs is enabled. Note that
if this is set to true, then batch jobs can preempt any other jobs.
- `ServiceSchedulerEnabled` `(bool: false)` (Enterprise Only) - Specifies whether preemption for service jobs is enabled. Note that
if this is set to true, then service jobs can preempt any other jobs.
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