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72 lines
3.6 KiB
Plaintext
72 lines
3.6 KiB
Plaintext
---
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layout: docs
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page_title: acl Block in Agent Configuration
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description: >-
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Configure Nomad's Access Control List (ACL) system behavior in the `acl` block of a Nomad agent configuration. Enable ACL enforcement, change token replication and expiration values, and tune the cache for token, role, and policy TTLs.
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---
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# acl Block in Agent Configuration
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<Placement groups={['acl']} />
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This page provides reference information for configuring Nomad's Access Control List (ACL) system behavior in the `acl` block of a Nomad agent configuration. Enable ACL enforcement, change token replication and expiration values, and tune the cache for token, role, and policy TTLs.
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Learn more about configuring Nomad's ACL system in the [Secure
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Nomad with Access Control guide][secure-guide].
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```hcl
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acl {
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enabled = true
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token_ttl = "30s"
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policy_ttl = "60s"
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role_ttl = "60s"
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}
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```
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## `acl` Parameters
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- `enabled` `(bool: false)` - Specifies if ACL enforcement is enabled. All other
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ACL configuration options depend on this value. All agents should have the
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same value for this parameter. For example the Nomad command line will
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send requests for client endpoints such as `alloc exec` directly to Nomad
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clients whenever they are accessible. In this scenario, the client will
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enforce ACLs, so both servers and clients should have ACLs enabled.
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- `token_ttl` `(string: "30s")` - Specifies the maximum time-to-live (TTL) for
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cached ACL tokens. This does not affect servers, since they do not cache tokens.
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Setting this value lower reduces how stale a token can be, but increases
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the request load against servers. If a client cannot reach a server, for example
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because of an outage, the TTL will be ignored and the cached value used.
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- `policy_ttl` `(string: "30s")` - Specifies the maximum time-to-live (TTL) for
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cached ACL policies. This does not affect servers, since they do not cache policies.
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Setting this value lower reduces how stale a policy can be, but increases
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the request load against servers. If a client cannot reach a server, for example
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because of an outage, the TTL will be ignored and the cached value used.
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- `role_ttl` `(string: "30s")` - Specifies the maximum time-to-live (TTL) for
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cached ACL roles. This does not affect servers, since they do not cache roles.
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Setting this value lower reduces how stale a role can be, but increases the
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request load against servers. If a client cannot reach a server, for example
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because of an outage, the TTL will be ignored and the cached value used.
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- `replication_token` `(string: "")` - Specifies the Secret ID of the ACL token
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to use for replicating policies and tokens. This is used by servers in
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non-authoritative region to mirror the policies and tokens into the local
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region from the [`authoritative_region`][authoritative-region]. Setting
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`replication_token` requires that ACLs have been bootstrapped in the
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authoritative region. Refer to [Configure for multiple regions][] in the ACLs
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tutorial.
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- `token_min_expiration_ttl` `(string: "1m")` - Specifies the lowest acceptable
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TTL value for an ACL token when setting expiration. This is used by the Nomad
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servers to validate ACL tokens and ACL authentication methods.
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- `token_max_expiration_ttl` `(string: "24h")` - Specifies the highest acceptable
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TTL value for an ACL token when setting expiration. This is used by the Nomad
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servers to validate ACL tokens and ACL authentication methods.
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[secure-guide]: /nomad/docs/secure/acl
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[authoritative-region]: /nomad/docs/configuration/server#authoritative_region
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[Configure for multiple regions]: /nomad/docs/secure/acl/bootstrap#configure-for-multiple-regions
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