299 lines
8.5 KiB
Plaintext
299 lines
8.5 KiB
Plaintext
---
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layout: api
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page_title: Variables - HTTP API
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description: The /var endpoints are used to query for and interact with variables.
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---
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# Variables HTTP API
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The `/var` and `/vars` endpoints are used to query for and interact with
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variables.
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See the [Variables] documentation for information how these capabilities are
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used. For a CLI to perform these operations manually, please see the
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documentation for the [`nomad var`] commands.
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## List Variables
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This endpoint lists all variables. Note this API returns only variable metadata
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without decrypting the variable body.
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| Method | Path | Produces |
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|--------|------------|--------------------|
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| `GET` | `/v1/vars` | `application/json` |
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The table below shows this endpoint's support for [blocking queries] and
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[required ACLs].
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| Blocking Queries | ACL Required |
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|------------------|-----------------------------------------------------------------------------------------|
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| `YES` | `namespace:* variables:list`<br />The list capability on the namespace and path queried |
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### Parameters
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- `prefix` `(string: "")` - Specifies a string to filter variables on based on
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an index prefix. This is specified as a query string parameter.
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- `next_token` `(string: "")` - This endpoint supports paging. The `next_token`
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parameter accepts a string which identifies the next expected job. This value
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can be obtained from the `X-Nomad-NextToken` header from the previous
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response.
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- `per_page` `(int: 0)` - Specifies a maximum number of variables to return for
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this request. If omitted, the response is not paginated. The value of the
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`X-Nomad-NextToken` header of the last response can be used as the
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`next_token` of the next request to fetch additional pages.
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- `filter` `(string: "")` - Specifies the [expression](/nomad/api-docs#filtering) used
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to filter the results. Consider using pagination or a query parameter to
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reduce resources used to serve the request.
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- `namespace` `(string: "default")` - Specifies the target namespace. Specifying
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`*` will return all variables across all the authorized namespaces.
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### Sample Request
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```shell-session
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$ curl \
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https://localhost:4646/v1/vars?namespace=prod&prefix=example
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```
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### Sample Response
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```json
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[
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{
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"Namespace": "prod",
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"Path": "example/first",
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"CreateIndex": 1457,
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"ModifyIndex": 1457,
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"CreateTime": 1662061225600373000,
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"ModifyTime": 1662061225600373000
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},
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{
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"Namespace": "prod",
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"Path": "example/second",
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"CreateIndex": 800,
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"ModifyIndex": 1000,
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"CreateTime": 1662061717905426000,
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"ModifyTime": 1662062162982630000
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}
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]
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```
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## Read Variable
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This endpoint reads a specific variable by path. This API returns the decrypted
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variable body.
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| Method | Path | Produces |
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|--------|--------------------|--------------------|
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| `GET` | `/v1/var/:var_path` | `application/json` |
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The table below shows this endpoint's support for [blocking queries] and
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[required ACLs].
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| Blocking Queries | ACL Required |
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|------------------|--------------------------------------------------------------------------------------------|
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| `YES` | `namespace:* variables:read`<br />The read capability on the variable's namespace and path |
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### Parameters
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- `namespace` `(string: "default")` - Specifies the variable's namespace.
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### Sample Request
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```shell-session
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$ curl \
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https://localhost:4646/v1/var/example/first?namespace=prod
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```
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### Sample Response
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```json
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{
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"Namespace": "prod",
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"Path": "example/first",
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"CreateIndex": 1457,
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"ModifyIndex": 1457,
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"CreateTime": 1662061225600373000,
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"ModifyTime": 1662061225600373000
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"Items": {
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"user": "me",
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"password": "passw0rd1"
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}
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}
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```
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## Create Variable
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This endpoint creates or updates a variable.
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| Method | Path | Produces |
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|--------|---------------------|--------------------|
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| `PUT` | `/v1/var/:var_path` | `application/json` |
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The table below shows this endpoint's support for [blocking queries] and
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[required ACLs].
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| Blocking Queries | ACL Required |
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|------------------|---------------------------------------------------------------------------------------------|
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| `NO` | `namespace:* variables:write`<br />The read capability on the variable's namespace and path |
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### Parameters
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- `namespace` `(string: "default")` - Specifies the variable's namespace. If
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set, this will override the request body.
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- `cas` `(int: <unset>)` - If set, the variable will only be updated if the
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`cas` value matches the current variables `ModifyIndex`. If the `cas` value is
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0, the variable is only created if it does not already exist. This paradigm
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allows check-and-set style updates.
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## Restrictions
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Variable paths are restricted to [RFC3986][] URL-safe characters that don't
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conflict with the use of the characters `@` and `.` in template blocks. This
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includes alphanumeric characters and the special characters `-`, `_`, `~`, and
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`/`. Paths may be up to 128 bytes long. The following regex matches the allowed
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paths: `^[a-zA-Z0-9-_~/]{1,128}$`
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Variable items are restricted to 64KiB in size. This limit is calculated by
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taking the sum of the length in bytes of all of the unencrypted keys and values
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in the `Items` field.
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### Sample Request
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```shell-session
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$ curl \
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-XPUT -d@spec.nsv.json \
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https://localhost:4646/v1/var/example/first
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```
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### Sample Payload
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```json
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{
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"Namespace": "prod",
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"Path": "example/first",
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"Items": {
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"user": "me",
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"password": "passw0rd1"
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}
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}
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```
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### Sample Response
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The response body returns the created or updated variable along with metadata
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created by the server:
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```json
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{
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"Namespace": "prod",
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"Path": "example/first",
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"CreateIndex": 1457,
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"ModifyIndex": 1457,
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"CreateTime": 1662061225600373000,
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"ModifyTime": 1662061225600373000,
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"Items": {
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"user": "me",
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"password": "passw0rd1"
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}
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}
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```
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### Sample Response for Conflict
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In the case of a compare-and-set conflict, the API will return HTTP error code
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409 and a response body showing the conflicting variable. If the provided ACL
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token does not also have `read` permissions to the variable path, the response
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will include only metadata and not the `Items` field:
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```json
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{
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"Namespace": "prod",
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"Path": "example/first",
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"CreateIndex": 1457,
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"ModifyIndex": 1457,
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"CreateTime": 1662061225600373000,
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"ModifyTime": 1662061225600373000,
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"Items": {
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"user": "me",
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"password": "passw0rd1"
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}
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}
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```
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## Delete Variable
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This endpoint deletes a specific variable by path.
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| Method | Path | Produces |
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|--------|--------------------|--------------------|
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| `DELETE` | `/v1/var/:var_path` | `application/json` |
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The table below shows this endpoint's support for [blocking queries] and
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[required ACLs].
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| Blocking Queries | ACL Required |
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|------------------|--------------------------------------------------------------------------------------------------|
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| `NO` | `namespace:* variables:destroy`<br />The destroy capability on the variable's namespace and path |
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### Parameters
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- `namespace` `(string: "default")` - Specifies the variable's namespace.
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- `cas` `(int: <unset>)` - If set, the variable will only be deleted if the
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`cas` value matches the current variables `ModifyIndex`.
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### Sample Request
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```shell-session
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$ curl \
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-XDELETE \
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https://localhost:4646/v1/var/example/first?namespace=prod
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```
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### Sample Response
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```json
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{
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"Index": 16
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}
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```
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### Sample Request With CAS
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```shell-session
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$ curl \
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-XDELETE \
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https://localhost:4646/v1/var/example/first?namespace=prod&cas=1
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```
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### Sample Response for Conflict
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In the case of a compare-and-set conflict on delete, the API will return HTTP
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error code 409 and a response body showing the conflicting variable. If the
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provided ACL token does not also have `read` permissions to the variable path,
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the response will include only metadata and not the `Items` field:
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```json
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{
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"Namespace": "prod",
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"Path": "example/first",
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"CreateIndex": 1457,
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"ModifyIndex": 1457,
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"CreateTime": 1662061225600373000,
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"ModifyTime": 1662061225600373000
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}
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```
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[Variables]: /nomad/docs/concepts/variables
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[`nomad var`]: /nomad/docs/commands/var
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[blocking queries]: /nomad/api-docs#blocking-queries
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[required ACLs]: /nomad/api-docs#acls
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[RFC3986]: https://www.rfc-editor.org/rfc/rfc3986#section-2
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