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* VAULT-11510 Vault Agent can start listeners without caching * VAULT-11510 fix order of imports * VAULT-11510 changelog * VAULT-11510 typo and better switch * VAULT-11510 update name * VAULT-11510 New api_proxy stanza to configure API proxy * VAULT-11510 First pass at API Proxy docs * VAULT-11510 nav data * VAULT-11510 typo * VAULT-11510 docs update
88 lines
3.4 KiB
Plaintext
88 lines
3.4 KiB
Plaintext
---
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layout: docs
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page_title: Vault Agent API Proxy
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description: >-
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Vault Agent's API Proxy functionality allows you to use Vault Agent's API as a proxy
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for Vault's API.
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---
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# Vault Agent API Proxy
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Vault Agent's API Proxy functionality allows you to use Vault Agent's API as a proxy
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for Vault's API.
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## Functionality
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The [`listener` stanza](/docs/agent#listener-stanza) for Vault Agent configures a listener for Vault Agent. If
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its `role` is not set to `metrics_only`, it will act as a proxy for the Vault server that
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has been configured in the [`vault` stanza](/docs/agent#vault-stanza) stanza of Vault Agent. This enables access to the Vault
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API from the Agent API, and can be configured to optionally allow or force the automatic use of
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the Auto-Auth token for these requests, as described below.
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If a `listener` has been configured alongside a `cache` stanza, the API Proxy will
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first attempt to utilize the cache subsystem for qualifying requests, before forwarding the
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request to Vault. See the [caching docs](/docs/agent/caching) for more information on caching.
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## Using Auto-Auth Token
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Vault Agent allows for easy authentication to Vault in a wide variety of
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environments using [Auto-Auth](/docs/agent/autoauth). By setting the
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`use_auto_auth_token` (see below) configuration, clients will not be required
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to provide a Vault token to the requests made to the Agent. When this
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configuration is set, if the request doesn't already bear a token, then the
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auto-auth token will be used to forward the request to the Vault server. This
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configuration will be overridden if the request already has a token attached,
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in which case, the token present in the request will be used to forward the
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request to the Vault server.
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## Forcing Auto-Auth Token
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Vault Agent can be configured to force the use of the auto-auth token by using
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the value `force` for the `use_auto_auth_token` option. This configuration
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overrides the default behavior described above in [Using Auto-Auth
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Token](/docs/agent/apiproxy#using-auto-auth-token), and instead ignores any
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existing Vault token in the request and instead uses the auto-auth token.
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## Configuration (`api_proxy`)
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The top level `api_proxy` block has the following configuration entries:
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- `use_auto_auth_token` `(bool/string: false)` - If set, the requests made to Agent
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without a Vault token will be forwarded to the Vault server with the
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auto-auth token attached. If the requests already bear a token, this
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configuration will be overridden and the token in the request will be used to
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forward the request to the Vault server. If set to `"force"` Agent will use the
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auto-auth token, overwriting the attached Vault token if set.
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The following two `api_proxy` options are only useful when making requests to a Vault
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Enterprise cluster, and are documented as part of its
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[Eventual Consistency](/docs/enterprise/consistency#vault-agent-and-consistency-headers)
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page.
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- `enforce_consistency` `(string: "never")` - Set to one of `"always"`
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or `"never"`.
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- `when_inconsistent` `(string: optional)` - Set to one of `"fail"`, `"retry"`,
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or `"forward"`.
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### Example Configuration
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Here is an example of a `listener` configuration alongside `api_proxy` configuration to force the use of the auto_auth token
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and enforce consistency.
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```hcl
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# Other Vault Agent configuration blocks
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# ...
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api_proxy {
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use_auto_auth_token = "force"
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enforce_consistency = "always"
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}
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listener "tcp" {
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address = "127.0.0.1:8100"
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tls_disable = true
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}
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```
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