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open-nomad/website/content/api-docs/agent.mdx
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Co-authored-by: Kendall Strautman <kendallstrautman@gmail.com>
2023-01-25 09:31:14 -08:00

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---
layout: api
page_title: Agent - HTTP API
description: |-
The /agent endpoints interact with the local Nomad agent to interact with
members and servers.
---
# Agent HTTP API
The `/agent` endpoints are used to interact with the local Nomad agent.
## List Members
This endpoint queries the agent for the known peers in the gossip pool. This
endpoint is only applicable to servers. Due to the nature of gossip, this is
eventually consistent.
| Method | Path | Produces |
| ------ | ---------------- | ------------------ |
| `GET` | `/agent/members` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `node:read` |
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/members
```
### Sample Response
```json
{
"ServerName": "bacon-mac",
"ServerRegion": "global",
"ServerDC": "dc1",
"Members": [
{
"Name": "bacon-mac.global",
"Addr": "127.0.0.1",
"Port": 4648,
"Tags": {
"mvn": "1",
"build": "0.5.5dev",
"port": "4647",
"bootstrap": "1",
"role": "nomad",
"region": "global",
"dc": "dc1",
"vsn": "1"
},
"Status": "alive",
"ProtocolMin": 1,
"ProtocolMax": 5,
"ProtocolCur": 2,
"DelegateMin": 2,
"DelegateMax": 4,
"DelegateCur": 4
}
]
}
```
## List Servers
This endpoint lists the known server nodes. The `servers` endpoint is used to
query an agent in client mode for its list of known servers. Client nodes
register themselves with these server addresses so that they may dequeue work.
The servers endpoint can be used to keep this configuration up to date if there
are changes in the cluster.
| Method | Path | Produces |
| ------ | ---------------- | ------------------ |
| `GET` | `/agent/servers` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `agent:read` |
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/servers
```
### Sample Response
```json
["127.0.0.1:4647"]
```
## Update Servers
This endpoint updates the list of known servers to the provided list. This
**replaces** all previous server addresses with the new list.
| Method | Path | Produces |
| ------ | ---------------- | -------------- |
| `POST` | `/agent/servers` | `(empty body)` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------- |
| `NO` | `agent:write` |
### Parameters
- `address` `(string: <required>)` - Specifies the list of addresses in the
format `ip:port`. This is specified as a query string.
### Sample Request
```shell-session
$ curl \
--request POST \
https://localhost:4646/v1/agent/servers?address=1.2.3.4:4647&address=5.6.7.8:4647
```
## Query Self
This endpoint queries the state of the target agent (self).
| Method | Path | Produces |
| ------ | ------------- | ------------------ |
| `GET` | `/agent/self` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `agent:read` |
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/self
```
### Sample Response
```json
{
"config": {
"Addresses": {
"HTTP": "127.0.0.1",
"RPC": "127.0.0.1",
"Serf": "127.0.0.1"
},
"AdvertiseAddrs": {
"HTTP": "127.0.0.1:4646",
"RPC": "127.0.0.1:4647",
"Serf": "127.0.0.1:4648"
},
"BindAddr": "127.0.0.1",
"Client": {
"AllocDir": "",
"ChrootEnv": {},
"ClientMaxPort": 14512,
"ClientMinPort": 14000,
"DisableRemoteExec": false,
"Enabled": true,
"GCDiskUsageThreshold": 99,
"GCInodeUsageThreshold": 99,
"GCInterval": 600000000000,
"MaxKillTimeout": "30s",
"Meta": {},
"NetworkInterface": "lo0",
"NetworkSpeed": 0,
"NodeClass": "",
"Options": {
"driver.docker.volumes": "true"
},
"Reserved": {
"CPU": 0,
"DiskMB": 0,
"MemoryMB": 0,
"ParsedReservedPorts": null,
"ReservedPorts": ""
},
"Servers": null,
"StateDir": ""
},
"Consul": {
"Addr": "",
"Auth": "",
"AutoAdvertise": true,
"CAFile": "",
"CertFile": "",
"ChecksUseAdvertise": false,
"ClientAutoJoin": true,
"ClientServiceName": "nomad-client",
"EnableSSL": false,
"KeyFile": "",
"ServerAutoJoin": true,
"ServerServiceName": "nomad",
"Timeout": 5000000000,
"Token": "",
"VerifySSL": false
},
"DataDir": "",
"Datacenter": "dc1",
"DevMode": true,
"DisableAnonymousSignature": true,
"DisableUpdateCheck": false,
"EnableDebug": true,
"EnableSyslog": false,
"Files": null,
"HTTPAPIResponseHeaders": {},
"LeaveOnInt": false,
"LeaveOnTerm": false,
"LogLevel": "DEBUG",
"NodeName": "",
"Ports": {
"HTTP": 4646,
"RPC": 4647,
"Serf": 4648
},
"Region": "global",
"Revision": "f551dcb83e3ac144c9dbb90583b6e82d234662e9",
"Server": {
"BootstrapExpect": 0,
"DataDir": "",
"Enabled": true,
"EnabledSchedulers": null,
"HeartbeatGrace": "",
"NodeGCThreshold": "",
"NumSchedulers": 0,
"ProtocolVersion": 0,
"RejoinAfterLeave": false,
"RetryInterval": "30s",
"RetryJoin": [],
"RetryMaxAttempts": 0,
"StartJoin": []
},
"SyslogFacility": "LOCAL0",
"TLSConfig": {
"CAFile": "",
"CertFile": "",
"EnableHTTP": false,
"EnableRPC": false,
"KeyFile": "",
"VerifyServerHostname": false
},
"Telemetry": {
"CirconusAPIApp": "",
"CirconusAPIToken": "",
"CirconusAPIURL": "",
"CirconusBrokerID": "",
"CirconusBrokerSelectTag": "",
"CirconusCheckDisplayName": "",
"CirconusCheckForceMetricActivation": "",
"CirconusCheckID": "",
"CirconusCheckInstanceID": "",
"CirconusCheckSearchTag": "",
"CirconusCheckSubmissionURL": "",
"CirconusCheckTags": "",
"CirconusSubmissionInterval": "",
"CollectionInterval": "1s",
"DataDogAddr": "",
"DataDogTags": [],
"DisableHostname": false,
"PublishAllocationMetrics": false,
"PublishNodeMetrics": false,
"StatsdAddr": "",
"StatsiteAddr": "",
"UseNodeName": false
},
"Vault": {
"Addr": "https://vault.service.consul:8200",
"AllowUnauthenticated": true,
"ConnectionRetryIntv": 30000000000,
"Enabled": null,
"Role": "",
"TLSCaFile": "",
"TLSCaPath": "",
"TLSCertFile": "",
"TLSKeyFile": "",
"TLSServerName": "",
"TLSSkipVerify": null,
"TaskTokenTTL": "",
"Token": "root"
},
"Version": "0.5.5",
"VersionPrerelease": "dev"
},
"member": {
"Addr": "127.0.0.1",
"DelegateCur": 4,
"DelegateMax": 4,
"DelegateMin": 2,
"Name": "bacon-mac.global",
"Port": 4648,
"ProtocolCur": 2,
"ProtocolMax": 5,
"ProtocolMin": 1,
"Status": "alive",
"Tags": {
"role": "nomad",
"region": "global",
"dc": "dc1",
"vsn": "1",
"mvn": "1",
"build": "0.5.5dev",
"port": "4647",
"bootstrap": "1"
}
},
"stats": {
"runtime": {
"cpu_count": "8",
"kernel.name": "darwin",
"arch": "amd64",
"version": "go1.8",
"max_procs": "7",
"goroutines": "79"
},
"nomad": {
"server": "true",
"leader": "true",
"leader_addr": "127.0.0.1:4647",
"bootstrap": "false",
"known_regions": "1"
},
"raft": {
"num_peers": "0",
"fsm_pending": "0",
"last_snapshot_index": "0",
"last_log_term": "2",
"commit_index": "144",
"term": "2",
"last_log_index": "144",
"snapshot_version_max": "1",
"latest_configuration_index": "1",
"latest_configuration": "[{Suffrage:Voter ID:127.0.0.1:4647 Address:127.0.0.1:4647}]",
"last_contact": "never",
"applied_index": "144",
"state": "Leader",
"last_snapshot_term": "0"
},
"client": {
"heartbeat_ttl": "17.79568937s",
"node_id": "fb2170a8-257d-3c64-b14d-bc06cc94e34c",
"known_servers": "127.0.0.1:4647",
"num_allocations": "0",
"last_heartbeat": "10.107423052s"
},
"serf": {
"event_time": "1",
"event_queue": "0",
"encrypted": "false",
"member_time": "1",
"query_time": "1",
"intent_queue": "0",
"query_queue": "0",
"members": "1",
"failed": "0",
"left": "0",
"health_score": "0"
}
}
}
```
## Join Agent
This endpoint introduces a new member to the gossip pool. This endpoint is only
eligible for servers.
| Method | Path | Produces |
| ------ | ------------- | ------------------ |
| `POST` | `/agent/join` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `none` |
### Parameters
- `address` `(string: <required>)` - Specifies the address to join in the
`ip:port` format. This is provided as a query parameter and may be specified
multiple times to join multiple servers.
### Sample Request
```shell-session
$ curl \
--request POST \
https://localhost:4646/v1/agent/join?address=1.2.3.4&address=5.6.7.8
```
### Sample Response
```json
{
"error": "",
"num_joined": 2
}
```
## Force Leave Agent
This endpoint forces a member of the gossip pool from the `"failed"` state to
the `"left"` state. This allows the consensus protocol to remove the peer and
stop attempting replication. This is only applicable for servers.
| Method | Path | Produces |
| ------ | -------------------- | ------------------ |
| `POST` | `/agent/force-leave` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------- |
| `NO` | `agent:write` |
### Parameters
- `node` `(string: <required>)` - Specifies the name of the node to force leave.
### Sample Request
```shell-session
$ curl \
--request POST \
https://localhost:4646/v1/agent/force-leave?node=client-ab2e23dc
```
## Health
This endpoint returns whether or not the agent is healthy. When using Consul it
is the endpoint Nomad will register for its own health checks.
When the agent is unhealthy 500 will be returned along with JSON response
containing an error message.
| Method | Path | Produces |
| ------ | --------------- | ------------------ |
| `GET` | `/agent/health` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `none` |
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/health
```
### Sample Response
```json
{
"client": {
"message": "ok",
"ok": true
},
"server": {
"message": "ok",
"ok": true
}
}
```
## Host
This endpoint returns data about the agent's host environment from the
perspective of the agent. It is included in the archive produced by
nomad operator debug. Known sensitive environment variables are shown as
`<redacted>`, but the response may still contain sensitive
information.
| Method | Path | Produces |
| ------ | ------------- | ------------------ |
| `GET` | `/agent/host` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `agent:read` |
### Parameters
- `server_id` `(string: <optional>)` - Specify the server name for
targeting.
- `node_id` `(string: <optional>)` - Specify the client node id for
targeting.
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/host?node_id=4bb9aca7-d43b-43fc-d604-3a271ef0a6c0
```
### Sample Response
```json
{
"AgentID": "4bb9aca7-d43b-43fc-d604-3a271ef0a6c0",
"HostData": {
"OS": "x86_64 ip-172-31-92-147 4.15.0-1007-aws Linux #7-Ubuntu SMP Tue Apr 24 10:56:17 UTC 2018",
"Network": [
{
"DialPacket": "\"udp4\" \"\"",
"DialStream": "\"tcp4\" \"\"",
"ListenPacket": "\"udp4\" \"\"",
"ListenStream": "\"tcp4\" \"\"",
"address": "127.0.0.1",
"binary": "01111111000000000000000000000001",
"broadcast": "127.255.255.255",
"first_usable": "127.0.0.1",
"hex": "7f000001",
"host": "127.0.0.1",
"last_usable": "127.255.255.254",
"mask_bits": "8",
"netmask": "255.0.0.0",
"network": "127.0.0.0",
"octets": "127 0 0 1",
"port": "0",
"size": "16777216",
"string": "127.0.0.1/8",
"type": "IPv4",
"uint32": "2130706433"
}
],
"ResolvConf": "nameserver 172.17.0.1\nnameserver 8.8.8.8\n",
"Hosts": "127.0.0.1 localhost\n\n# The following lines are desirable for IPv6 capable hosts\n::1 ip6-localhost ip6-loopback\nfe00::0 ip6-localnet\nff00::0 ip6-mcastprefix\nff02::1 ip6-allnodes\nff02::2 ip6-allrouters\nff02::3 ip6-allhosts\n127.0.0.1 ip-172-31-71-163\n127.0.0.1 ip-172-31-92-147\n",
"Environment": {
"INVOCATION_ID": "b106b6ac67764c9b9f85c5cc5c3357e5",
"JOURNAL_STREAM": "9:109527",
"LANG": "C.UTF-8",
"PATH": "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
},
"Disk": {
"/": {
"DiskMB": 7876,
"UsedMB": 4287
}
}
}
}
```
## Stream Logs
This endpoint streams logs from the local agent until the connection is closed
| Method | Path | Produces |
| ------ | ---------------- | ------------------ |
| `GET` | `/agent/monitor` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `agent:read` |
### Parameters
- `log_level` `(string: "info")` - Specifies a text string containing a log level
to filter on, such as `info`. Possible values include `trace`, `debug`,
`info`, `warn`, `error`
- `log_json` `(bool: false)` - Specifies if the log format for streamed logs
should be JSON.
- `node_id` `(string: "a57b2adb-1a30-2dda-8df0-25abb0881952")` - Specifies a text
string containing a node-id to target for streaming.
- `server_id` `(string: "server1.global")` - Specifies a text
string containing a server name or "leader" to target a specific remote server
or leader for streaming.
- `plain` `(bool: false)` - Specifies if the response should be JSON or
plaintext
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/monitor?log_level=debug&server_id=leader
$ curl \
https://localhost:4646/v1/agent/monitor?log_level=debug&node_id=a57b2adb-1a30-2dda-8df0-25abb0881952
```
### Sample Response
```json
{
"Offset": 0,
"Data": "NTMxOTMyCjUzMTkzMwo1MzE5MzQKNTMx..."
"FileEvent": "log"
}
```
#### Field Reference
The return value is a stream of frames. These frames contain the following
fields:
- `Data` - A base64 encoding of the bytes being streamed.
- `FileEvent` - An event that could cause a change in the streams position. The
possible value for this endpoint is "log".
- `Offset` - Offset is the offset into the stream.
## Agent Runtime Profiles
This endpoint is the equivalent of Go's /debug/pprof endpoint but is protected
by ACLs and supports remote forwarding to a client node or server. See the
[Golang documentation](https://golang.org/pkg/runtime/pprof/#Profile) for a list of available profiles.
| Method | Path | Produces |
| ------ | ------------------------------ | -------------------------- |
| `GET` | `/agent/pprof/cmdline` | `text/plain` |
| `GET` | `/agent/pprof/profile` | `application/octet-stream` |
| `GET` | `/agent/pprof/trace` | `application/octet-stream` |
| `GET` | `/agent/pprof/<pprof profile>` | `application/octet-stream` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------- |
| `NO` | `agent:write` |
### Default Behavior
This endpoint is enabled whenever ACLs are enabled. Due to the potentially
sensitive nature of data contained in profiles, as well as their significant
performance impact, the agent/pprof endpoint is protected by a high level ACL:
`agent:write`. For these reasons its recommended to leave [`enable_debug`](/nomad/docs/configuration#enable_debug)
unset and only use the ACL-protected endpoints.
The following table explains when each endpoint is available:
| Endpoint | `enable_debug` | ACLs | **Available?** |
| --------------- | -------------- | ---- | -------------- |
| /v1/agent/pprof | unset | n/a | no |
| /v1/agent/pprof | `true` | n/a | yes |
| /v1/agent/pprof | `false` | n/a | no |
| /v1/agent/pprof | unset | off | no |
| /v1/agent/pprof | unset | on | **yes** |
| /v1/agent/pprof | `true` | off | yes |
| /v1/agent/pprof | `false` | on | **yes** |
### Parameters
- `node_id` `(string: "a57b2adb-1a30-2dda-8df0-25abb0881952")` - Specifies a text
string containing a Node ID to target for profiling.
- `server_id` `(string: "server1.global")` - Specifies a text
string containing a Server ID, name, or `leader` to target a specific remote
server or leader for profiling.
- `seconds` `(int: 3)` - Specifies the amount of time to run a profile or trace
request for.
- `debug` `(int: 1)` - Specifies if a given pprof profile should be returned as
human readable plain text instead of the pprof binary format. Defaults to 0,
setting to 1 enables human readable plain text.
### Sample Request
```shell-session
$ curl -O -J \
--header "X-Nomad-Token: 8176afd3-772d-0b71-8f85-7fa5d903e9d4" \
https://localhost:4646/v1/agent/pprof/goroutine?server_id=leader
$ go tool pprof goroutine
$ curl -O -J \
--header "X-Nomad-Token: 8176afd3-772d-0b71-8f85-7fa5d903e9d4" \
https://localhost:4646/v1/agent/profile?seconds=5&node_id=a57b2adb-1a30-2dda-8df0-25abb0881952
$ go tool pprof profile
$ curl -O -J \
--header "X-Nomad-Token: 8176afd3-772d-0b71-8f85-7fa5d903e9d4" \
https://localhost:4646/v1/agent/trace?&seconds=5&server_id=server1.global
go tool trace trace
```
## Fetch all scheduler worker's status
The `/agent/schedulers` endpoint allow Nomad operators to inspect the state of
a Nomad server agent's scheduler workers.
| Method | Path | Produces |
| ------ | ------------------- | ------------------ |
| `GET` | `/agent/schedulers` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `agent:read` |
### Parameters
This endpoint accepts no additional parameters.
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/schedulers
```
### Sample Response
```json
{
"schedulers": [
{
"enabled_schedulers": [
"service",
"batch",
"system",
"sysbatch",
"_core"
],
"id": "5669d6fa-0def-7369-6558-a47c35fdc675",
"started": "2021-12-21T19:25:00.911883Z",
"status": "Paused",
"workload_status": "Paused"
},
{
"enabled_schedulers": [
"service",
"batch",
"system",
"sysbatch",
"_core"
],
"id": "c919709d-6d14-66bf-b425-80b8167a267e",
"started": "2021-12-21T19:25:00.91189Z",
"status": "Paused",
"workload_status": "Paused"
},
{
"enabled_schedulers": [
"service",
"batch",
"system",
"sysbatch",
"_core"
],
"id": "f5edb69a-6122-be8f-b32a-23cd8511dba5",
"started": "2021-12-21T19:25:00.911961Z",
"status": "Paused",
"workload_status": "Paused"
},
{
"enabled_schedulers": [
"service",
"batch",
"system",
"sysbatch",
"_core"
],
"id": "458816ae-83cf-0710-d8d4-35d2ad2e42d7",
"started": "2021-12-21T19:25:00.912119Z",
"status": "Started",
"workload_status": "WaitingToDequeue"
}
],
"server_id": "server1.global"
}
```
## Read scheduler worker configuration
This endpoint returns data about the agent's scheduler configuration from
the perspective of the agent. This is only applicable for servers.
| Method | Path | Produces |
| ------ | -------------------------- | ------------------ |
| `GET` | `/agent/schedulers/config` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------ |
| `NO` | `agent:read` |
### Parameters
This endpoint accepts no additional parameters.
### Sample Request
```shell-session
$ curl \
https://localhost:4646/v1/agent/schedulers/config
```
### Sample Response
```json
{
"enabled_schedulers": [
"service",
"batch",
"system",
"sysbatch",
"_core"
],
"num_schedulers": 8,
"server_id": "server1.global"
}
```
## Update scheduler worker configuration
This allows a Nomad operator to modify the server's running scheduler
configuration, which will remain in effect until another update or until the
node is restarted. For durable changes to this value, set the corresponding
values—[`num_schedulers`][] and [`enabled_schedulers`][]—in the node's
configuration file. The response contains the configuration after attempting
to apply the provided values. This is only applicable for servers.
| Method | Path | Produces |
| ------ | -------------------------- | ------------------ |
| `PUT` | `/agent/schedulers/config` | `application/json` |
The table below shows this endpoint's support for
[blocking queries](/nomad/api-docs#blocking-queries) and
[required ACLs](/nomad/api-docs#acls).
| Blocking Queries | ACL Required |
| ---------------- | ------------- |
| `NO` | `agent:write` |
### Sample Payload
```json
{
"enabled_schedulers": [
"service",
"batch",
"system",
"sysbatch",
"_core"
],
"num_schedulers": 12
"server_id": "server1.global"
}
```
### Sample Request
```shell-session
$ curl \
--request PUT \
--data @payload.json \
https://localhost:4646/v1/agent/schedulers/config
```
### Sample Response
```json
{
"enabled_schedulers": [
"service",
"batch",
"system",
"sysbatch",
"_core"
],
"num_schedulers": 12,
"server_id": "server1.global"
}
```
[`enabled_schedulers`]: /nomad/docs/configuration/server#enabled_schedulers
[`num_schedulers`]: /nomad/docs/configuration/server#num_schedulers
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