fixed links and clarified some sections in gateway configuration doc
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layout: docs
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page_title: Consul API Gateway Gateway
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description: >-
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Consul API Gateway Gateway
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This topic descrbes how to configure the Consul API Gateway Gateway object
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---
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# Gateway
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@ -22,34 +22,36 @@ Specify the following parameters to declare a Gateway:
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| `kind` | Specifies the type of configuration object. The value should always be `Gateway`. | Required |
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| `description` | Human-readable string that describes the purpose of the `Gateway`. | Optional |
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| `version ` | Specifies the Kubernetes API version. The value should always be `gateway.networking.k8s.io/v1alpha2` | Required |
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| `scope` | Specifies the effective scope of the Gateway. The value should always be namespaced. | Required |
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| `fields` | Specifies the configurations for the Gateway. The fields are listed in the Configuration model. Details for each field are described in the Specification. | Required |
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| `scope` | Specifies the effective scope of the Gateway. The value should always be `namespaced`. | Required |
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| `fields` | Specifies the configurations for the Gateway. The fields are listed in the [configuration model](#configuration-model). Details for each field are described in the [specification](#specification). | Required |
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## Configuration model
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* [`gatewayClassName`](#gatewayClassName): string | required
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The following outline shows how to format the configurations in the `Gateway` object. Click on a property name to view details about the configuration.
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* [`gatewayClassName`](#gatewayclassname): string | required
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* [`listeners`](#listeners): array of objects | required
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* [`allowedRoutes`](#listeners-allowedRoutes): object | required
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* [`namespaces`](#listeners-namespaces): object | required
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* [`from`](#listeners-namespaces-from): string | required
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* [`selector`](#listeners-namespaces-selector): object | required if from is configured to selector
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* [`matchExpressions`](#listeners-namespaces-selector-matchExpressions): array of objects | required if matchLabels is not configured
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* [`key`](#listeners-namespaces-selector-matchExpressions-key): string | required if matchExpressions is declared
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* [`operator`](#listeners.namespaces-selector-operator): string | required if matchExpressions is declared
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* [`values`](#listeners.namespaces-selector-values): array of strings | required if matchExpressions is declared
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* [`matchLabels`](#listeners-namespaces-selector-matchLabels): map of strings | required if matchExpressions is not configured
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* [`allowedRoutes`](#listeners-allowedroutes): object | required
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* [`namespaces`](#listeners-allowedroutes-namespaces): object | required
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* [`from`](#listeners-namespaces-from): string | required
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* [`selector`](#listeners-allowedroutes-namespaces-selector): object | required if `from` is configured to `selector`
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* [`matchExpressions`](#listeners-allowedroutes-namespaces-selector-matchexpressions): array of objects | required if `matchLabels` is not configured
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* [`key`](#listeners-allowedroutes-namespaces-selector-matchexpressions): string | required if `matchExpressions` is declared
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* [`operator`](#listeners-allowedroutes-namespaces-selector-matchexpressions): string | required if `matchExpressions` is declared
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* [`values`](#listeners-allowedroutes-namespaces-selector-matchexpressions): array of strings | required if `matchExpressions` is declared
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* [`matchLabels`](#listeners-allowedroutes-namespaces-selector-matchlabels): map of strings | required if `matchExpressions` is not configured
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* [`hostname`](#listeners-hostname): string | required
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* [`name`](#listeners-name): string | required
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* [`port`](#listeners-port): integer | required
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* [`protocol`](#listeners-protocol)`: string | required
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* [`tls`](#listeners-tls): object | required if protocol is set to HTTPS
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* [`certificateRefs`](#listeners-tls-certificateRefs): array or objects | required if tls is declared
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* [`name`](#listeners-tls-certificateRefs-name): string | required if certificateRefs is declared
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* [`namespace`](#listeners-tls-certificateRefs-namespace): string | required if certificateRefs is declared
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* [`mode`](#listeners-tls-mode): string | required if certificateRefs is declared
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* [`options`](#listeners-tls-options): map of strings | optional
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* [`tls`](#listeners-tls): object | required if `protocol` is set to `HTTPS`
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* [`certificateRefs`](#listeners-tls): array or objects | required if `tls` is declared
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* [`name`](#listeners-tls): string | required if `certificateRefs` is declared
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* [`namespace`](#listeners-tls): string | required if `certificateRefs` is declared
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* [`mode`](#listeners-tls): string | required if `certificateRefs` is declared
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* [`options`](#listeners-tls): map of strings | optional
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## Specification
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@ -74,37 +76,34 @@ Specifies a `namespace` object that defines the types of routes that may be atta
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Determines which routes are allowed to attach to the `listener`. Only routes in the same namespace as the `Gateway` may be attached by default.
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### listeners.allowedRoutes.namespaces.from
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Specifies the policy for which namespaces a route may attach to a `Gateway` from. Defaults to `Same`.
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Determines which namespaces are allowed to attach a route to the `Gateway`. You can specify one of the following strings:
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This parameter has the following properties:
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* Type: string
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* Required: required
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You can specify one of the following strings:
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* `All`: Routes in all namespaces may be attached to the `Gateway`.
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* `Same`: Only routes in the same namespace as the `Gateway` may be attached.
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* `Selector`: Only routes in namespaces that match the `selector` may be attached.
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* `Same` (default): Only routes in the same namespace as the `Gateway` may be attached.
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* `Selector`: Only routes in namespaces that match the [`selector`](#listeners-allowedroutes-namespaces-selector) may be attached.
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This parameter is required.
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### listeners.allowedRoutes.namespaces.selector
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Specifies a method of matching namespaces from which routes are allowed to attach to the listener.
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* Type: Object
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* Required: Required when `from` is configured to `Selector`.
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Specifies a method for selecting routes that are allowed to attach to the listener. The `Gateway` checks for namespaces in the network that match either a regular expression or a label. Routes from the matching namespace are allowed to attach to the listener.
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The selector configuration contains one of the following objects:
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* `matchExpressions`
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* `matchLabels`
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You can configure one of the following objects:
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* [`matchExpressions`](#listeners-allowedroutes-namespaces-selector-matchexpressions)
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* [`matchLabels`](#listeners-allowedroutes-namespaces-selector-matchlabels)
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This field is required when [`from`](#listeners-allowedroutes-namespaces-from) is configured to `Selector`.
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### listeners.allowedRoutes.namespaces.selector.matchExpressions
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Specifies an array of requirements for matching namespaces. If a match is found, then routes from the matching namespace(s) are allowed to attach to the `Gateway`. The following table describes members of the `matchExpressions` array:
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| Requirement | Description | Type |
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|:----------- |:------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |:---------------- |
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|`key` | Specifies that label that the key applies to. | string |
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|`operator` | Specifies the key's relation to a set of values. The following values are valid:In: description of what this means NotIn: description of what this means Exists: description of what this means DoesNotExist: description of what this means | string |
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|`values` | Specifies an array of string values. If the operator is configured to In or NotIn,the values array must be non-empty. If theoperator is Exists or DoesNotExist, the values array must be empty. This array is replaced during a strategic merge patch. | array of strings |
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|`scope` | Specifies the effective scope of the Gateway. The value should always be namespaced. | Required |
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|`fields` | Specifies the configurations for the Gateway. The fields are listed in the Configuration model. Details for each field are described in the Specification. | Required |
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| Requirement | Description | Type | Required |
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|--- |--- |--- |--- |
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|`key` | Specifies the label that the `key` applies to. | string | required when `matchExpressions` is declared |
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|`operator` | Specifies the key's relation to a set of values. You can use the following keywords: <ul><li>`In`: Only routes in namespaces that contain the strings in the `values` field can attach to the `Gateway`. </li><li>`NotIn`: Routes in namespaces that do not contain the strings in the `values` field can attach to the `Gateway`. </li><li>`Exists`: Routes in namespaces that contain the `key` value are allowed to attach to the `Gateway`.</li><li>`DoesNotExist`: Routes in namespaces that do not contain the `key` value are allowed to attach to the `Gateway`.</li></ul> | string | required when `matchExpressions` is declared |
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|`values` | Specifies an array of string values. If `operator` is configured to `In` or `NotIn`, then the `values` array must contain values. If `operator` is configured to `Exists` or `DoesNotExist`, then the `values` array must be empty. This array is replaced during a strategic merge patch. | array of strings | required when `matchExpressions` is declared |
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In the following example, routes in namespaces that contain `foo` and `bar` are allowed to attach routes to the `Gateway`.
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```yaml
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namespaceSelector:
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matchExpressions:
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@ -118,52 +117,62 @@ namespaceSelector:
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### listeners.allowedRoutes.namespaces.selector.matchLabels
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Specifies an array of labels and label values. If a match is found, then routes with the matching label(s) are allowed to attach to the `Gateway`. This selector can contain any arbitrary key/value pair.
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In the following example, routes in namespaces that have a `bar` label are allowed to attache to the `Gateway`.
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```yaml
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namespaceSelector:
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matchLabels:
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foo: bar
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```
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For more on labels, see [Labels and Selectors](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/)
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Refer to [Labels and Selectors](https://kubernetes.io/docs/concepts/overview/working-with-objects/labels/) in the Kubernetes documentation for additional information about labels.
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### listeners.hostname
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Specifies the `listener`'s hostname
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Specifies the `listener`'s hostname.
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* Type: string
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* Required: required
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### listeners.name
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Specifies the `listener`'s name
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Specifies the `listener`'s name.
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* Type: string
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* Required: required
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### listeners.port
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Specifies the port number that the `listener` will attach to
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Specifies the port number that the `listener` attaches to.
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* Type: integer
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* Required: required
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### listeners.protocol
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Specifies the protocol the `listener` will use
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Specifies the protocol the `listener` communicates on.
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* Type: string
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* Required: required
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Allowed values are `TCP`, `HTTP`, or `HTTPS`
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### listeners.tls
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* Type: Object
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* Required: required if `protocol` is set to `HTTPS`
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Specifies the `tls` configurations for the `Gateway`. The `tls` object is required if `protocol` is set to `HTTPS`. The object contains the following fields:
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### listeners.tls.certificateRefs
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`CertificateRefs` contains a series of references to Kubernetes objects that contains TLS certificates and private keys. These certificates are used to establish a TLS handshake for requests that match the hostname of the associated `listener`. Each reference must be a Kubernetes Secret, and, if using a Secret in a namespace other than the`Gateway`'s, must have a corresponding `ReferencePolicy` created.
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* Type: Object or Array
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* Required: required if `tls` is set
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| Parameter | Description | Type | Required |
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| --- | --- | --- | --- |
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| `certificateRefs` | <div style={{width:480}}>Specifies Kubernetes `name` and `namespace` objects that contains TLS certificates and private keys. <br/>The certificates establish a TLS handshake for requests that match the `hostname` of the associated `listener`. Each reference must be a Kubernetes Secret. If you are using a Secret in a namespace other than the `Gateway`'s, each reference must also have a corresponding [`ReferencePolicy`](https://gateway-api.sigs.k8s.io/v1alpha2/references/spec/#gateway.networking.k8s.io/v1alpha2.ReferencePolicy).</div> | Object or array | Required if `tls` is set |
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| `mode` | Specifies the ? | string | Required if `certificateRefs` is set |
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| `options` | ??? | Map of strings | optional |
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### listeners.tls.mode
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* Type: String
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* Required: required if certificateRefs is set
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In the following example, `tls` settings are configured . . .
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```yaml
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tls:
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certificateRefs:
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name: ?
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namespace: ?
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mode: ?
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options:
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- ?
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- ?
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- ?
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```
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### listeners.tls.options
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* Type: Map of Strings
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* Required: optional
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## Complete configuration
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The following example shows a fully configured `Gateway`.
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