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Implement support for URL and Host Header Rewrite for Application Load Balancer
* Implement support for RegexValues in conditions annotation * Implement support for RegexValues in ingress spec paths * Add `alb.ingress.kubernetes.io/use-regex-path-match` annotation * Update `buildPathPatternsForImplementationSpecificPathType` to treat spec path as regex when annotation is "true" * Implement transforms annotation * Implement `buildTransforms` to get transforms from `transforms.${svc-name}` annotation * Implement `buildSDKTransforms` to marshall transforms * Add interface for transforms model * Update enhanced backend, `ListenerRuleManager`, `buildListenerRules`, `matchResAndSDKListenerRules` to handle transforms * Rename `resLRDesiredActionsAndConditionsPair` to `resLRDesiredRuleConfig`, extend to support transforms property * Update `matchResAndSDKListenerRules` and related helpers to support transforms property * Implement `CompareOptionForTransform` to compare transforms objects * Add and update unit tests * Misc * Add documentation for URL Rewrite * Add client-side validation to prevent mixing Values and RegexValues for host-name and path-pattern conditions * Remove leading slash from regex rule path * Implement host regex value support
1 parent 1dd68b7 commit 5ab8fb1

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‎docs/guide/ingress/annotations.md‎

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@@ -62,7 +62,9 @@ You can add annotations to kubernetes Ingress and Service objects to customize t
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| [alb.ingress.kubernetes.io/auth-session-cookie](#auth-session-cookie) | string |AWSELBAuthSessionCookie| Ingress,Service | N/A |
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| [alb.ingress.kubernetes.io/auth-session-timeout](#auth-session-timeout) | integer |'604800'| Ingress,Service | N/A |
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| [alb.ingress.kubernetes.io/actions.${action-name}](#actions) | json |N/A| Ingress | N/A |
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| [alb.ingress.kubernetes.io/transforms.${transforms-name}](#transforms) | json |N/A| Ingress | N/A |
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| [alb.ingress.kubernetes.io/conditions.${conditions-name}](#conditions) | json |N/A| Ingress | N/A |
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| [alb.ingress.kubernetes.io/use-regex-path-match](#use-regex-path-match) | boolean |N/A| Ingress | false |
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| [alb.ingress.kubernetes.io/target-node-labels](#target-node-labels) | stringMap |N/A| Ingress,Service | N/A |
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| [alb.ingress.kubernetes.io/mutual-authentication](#mutual-authentication) | json |N/A| Ingress | Exclusive |
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| [alb.ingress.kubernetes.io/multi-cluster-target-group](#multi-cluster-target-group) | boolean |N/A| Ingress, Service | N/A |
@@ -362,11 +364,67 @@ Traffic Routing can be controlled with following annotations:
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name: use-annotation
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```
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- <a name="transforms">`alb.ingress.kubernetes.io/transforms.${transforms-name}`</a> Provides a method for specifying transforms on Ingress spec.
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The `transforms-name` in the annotation must match the serviceName in the Ingress rules.
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!!!example "URL rewrite"
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Example transform to remove the leading `/api/` from request paths:
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```yaml
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alb.ingress.kubernetes.io/transforms.my-service: >
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[
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{
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"type": "url-rewrite",
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"urlRewriteConfig": {
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"rewrites": [
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{
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"regex": "^\\/api\\/(.+)$",
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"replace": "/$1"
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}
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]
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}
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}
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]
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```
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!!!example "Host header rewrite"
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Example transform to replace `example.com` with `example.org` from request host headers:
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```yaml
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alb.ingress.kubernetes.io/transforms.my-service: >
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[
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{
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"type": "host-header-rewrite",
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"hostHeaderRewriteConfig": {
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"rewrites": [
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{
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"regex": "^(.+)\\.example\\.com$",
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"replace": "$1.example.org"
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}
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]
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}
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}
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]
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```
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- <a name="conditions">`alb.ingress.kubernetes.io/conditions.${conditions-name}`</a> Provides a method for specifying routing conditions **in addition to original host/path condition on Ingress spec**.
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The `conditions-name` in the annotation must match the serviceName in the Ingress rules.
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It can be a either real serviceName or an annotation based action name when servicePort is `use-annotation`.
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Condition values can be specified using *either* `values` or `regexValues`:
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- `values`: Wildcard syntax, where `*` matches 0 or more characters, and `?` matches exactly 1 character.
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`values` is supported for all condition types: `host-header`, `http-header`, `http-request-method`, `path-pattern`, and `source-ip`.
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- `regexValues`: Regex syntax.
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`regexValues` is supported for the following condition types: `host-header`, `http-header`, and `path-pattern`.
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!!!warning "limitations"
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General ALB limitations applies:
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Refer [ALB documentation](https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-listeners.html#rule-condition-types) for more details.
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!!!example
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!!!example "Examples using `values`"
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- rule-path1:
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- Host is www.example.com OR anno.example.com
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- Path is /path1
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!!!note
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If you are using `alb.ingress.kubernetes.io/target-group-attributes` with `stickiness.enabled=true`, you should add `TargetGroupStickinessConfig` under `alb.ingress.kubernetes.io/actions.weighted-routing`
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!!!example
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!!!example "Example using target group stickiness config"
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```yaml
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apiVersion: networking.k8s.io/v1
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port:
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name: use-annotation
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```
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!!!example "Examples using `regexValues`"
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HTTP header condition using regex values:
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```yaml
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alb.ingress.kubernetes.io/conditions.my-service: >
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[{ "field": "http-header", "httpHeaderConfig": { "httpHeaderName": "User-Agent", "regexValues": [ ".+Chrome.+" ] } }]
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```
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Path condition using regex values:
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```yaml
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alb.ingress.kubernetes.io/conditions.my-service: >
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[{ "field": "path-pattern", "pathPatternConfig": { "regexValues": [ "^/api/?(.*)$" ] } }]
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```
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Host header condition using regex values:
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```yaml
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alb.ingress.kubernetes.io/conditions.my-service: >
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[{ "field": "host-header", "hostHeaderConfig": { "regexValues": [ "^(.+)\\.example\\.com" ] } }]
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```
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!!!warning "Considerations when using `regexValues`"
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ALB does not support mixing `values` (wildcard syntax) and `regexValues` (regex syntax) for the same condition type.
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In particular, when using the AWS Load Balancer Controller:
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- By default, additional `path-pattern` conditions **must** use `values`.
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This is because the AWS Load Balancer Controller automatically adds `path-pattern` conditions using `values` according to your [Ingress specification](../spec/).
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To configure additional `path-pattern` conditions using `regexValues`, configure the [`alb.ingress.kubernetes.io/use-regex-path-match`](#use-regex-path-match) annotation. When this annotation is set to `"true"`, the AWS Load Balancer Controller can add `path-pattern` conditions with `regexValues`.
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- If your [Ingress specification](../spec/) includes a `host` rule, additional `host-header` conditions **must** use `values`.
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To configure `host-header` conditions using `regexValues`, use the `alb.ingress.kubernetes.io/conditions.${conditions-name}` annotation instead of Ingress specification rules.
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In other words:
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- When [`alb.ingress.kubernetes.io/use-regex-path-match`](#use-regex-path-match) is `"false"` (default value), for HTTP paths using `pathType: ImplementationSpecific`, additional `path-pattern` conditions can **only** use `values`.
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- When [`alb.ingress.kubernetes.io/use-regex-path-match`](#use-regex-path-match) is `"true"`, for HTTP paths using `pathType: ImplementationSpecific`, additional `path-pattern` conditions can **only** use `regexValues`.
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- If a ingress rule `host` is specified, additional `host-header` conditions can only use `values`.
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- <a name="use-regex-path-match">`alb.ingress.kubernetes.io/use-regex-path-match`</a> Configure whether HTTP paths in your [Ingress specification](../spec/) should be evaluated using regex.
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* This configuration only applies to HTTP paths using `pathType: ImplementationSpecific`. HTTP paths using `pathType: Exact` or `pathType: Prefix` are not affected by this annotation.
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* A leading `/` must precede the regex. The leading `/` will be removed from the regex.
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!!!example "Ingress rule path evaluated as regex"
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Annotation:
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```yaml
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alb.ingress.kubernetes.io/use-regex-path-match: "true"
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```
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Ingress rule path:
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```yaml
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- path: "/^/api/(.+)$"
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pathType: ImplementationSpecific
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backend:
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service:
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name: service-2048
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port:
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number: 80
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```
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With this configuration, the rule condition regex value will be `^/api/(.+)$` as the leading `/` is removed from the regex.
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## Access control
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Access control for LoadBalancer can be controlled with following annotations:

‎docs/guide/tasks/url_rewrite.md‎

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# URL rewrite
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URL rewrite enables request URLs to be transformed before the request reaches your backend services.
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Consider the following scenario:
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- An ingress exposes two services:
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- An API service exposed at path prefix `/api/`.
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- A users service exposed at path prefix `/users/`.
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- These service **do not expect** the `/api/` or `/users/` prefixes in the request path.
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For this scenario, URL rewrite would be used to remove the leading `/api/` and `/users/` from the request paths.
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Example ingress manifest:
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```yaml
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apiVersion: networking.k8s.io/v1
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kind: Ingress
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metadata:
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namespace: default
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name: ingress
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annotations:
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alb.ingress.kubernetes.io/certificate-arn: arn:aws:acm:us-west-2:xxxx:certificate/xxxxxx
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alb.ingress.kubernetes.io/listen-ports: '[{"HTTP": 80}, {"HTTPS":443}]'
25+
alb.ingress.kubernetes.io/ssl-redirect: "443"
26+
27+
# Add transform to users-service to remove "/users/" prefix from paths
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alb.ingress.kubernetes.io/transforms.users-service: >
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[
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{
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"type": "url-rewrite",
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"urlRewriteConfig": {
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"rewrites": [{
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"regex": "^/users/(.+)$",
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"replace": "/$1"
36+
}]
37+
}
38+
}
39+
]
40+
# Add transform to api-service to remove "/api/" prefix from paths
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alb.ingress.kubernetes.io/transforms.api-service: >
42+
[
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{
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"type": "url-rewrite",
45+
"urlRewriteConfig": {
46+
"rewrites": [{
47+
"regex": "^/api/(.+)$",
48+
"replace": "/$1"
49+
}]
50+
}
51+
}
52+
]
53+
spec:
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ingressClassName: alb
55+
rules:
56+
- http:
57+
paths:
58+
- path: /users/
59+
pathType: Prefix
60+
backend:
61+
service:
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name: users-service
63+
port:
64+
number: 80
65+
- path: /api/
66+
pathType: Prefix
67+
backend:
68+
service:
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name: api-service
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port:
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number: 80
72+
- path: /*
73+
pathType: ImplementationSpecific
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backend:
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service:
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name: default-service
77+
port:
78+
number: 80
79+
```
80+
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## Host header rewrite
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83+
To rewrite from `api.example.com` to `example.com`:
84+
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```yaml
86+
apiVersion: networking.k8s.io/v1
87+
kind: Ingress
88+
metadata:
89+
namespace: default
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name: ingress
91+
annotations:
92+
alb.ingress.kubernetes.io/certificate-arn: arn:aws:acm:us-west-2:xxxx:certificate/xxxxxx
93+
alb.ingress.kubernetes.io/listen-ports: '[{"HTTP": 80}, {"HTTPS":443}]'
94+
alb.ingress.kubernetes.io/ssl-redirect: "443"
95+
96+
# add transform to api-service to replace "api.example.com" hostname with "example.com"
97+
alb.ingress.kubernetes.io/transforms.api-service: >
98+
[
99+
{
100+
"type": "host-header-rewrite",
101+
"hostHeaderRewriteConfig": {
102+
"rewrites": [{
103+
"regex": "^api\\.example\\.com$",
104+
"replace": "example.com"
105+
}]
106+
}
107+
}
108+
]
109+
spec:
110+
ingressClassName: alb
111+
rules:
112+
- host: api.example.com
113+
http:
114+
paths:
115+
- path: /*
116+
pathType: Prefix
117+
backend:
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service:
119+
name: api-service
120+
port:
121+
number: 80
122+
```
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## Additional resources
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- [`alb.ingress.kubernetes.io/transforms.${transforms-name}` annotation documentation](../../ingress/annotations#transforms)

‎go.mod‎

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@@ -3,21 +3,21 @@ module sigs.k8s.io/aws-load-balancer-controller
33
go 1.24.6
44

55
require (
6-
github.com/aws/aws-sdk-go-v2 v1.36.3
6+
github.com/aws/aws-sdk-go-v2 v1.39.2
77
github.com/aws/aws-sdk-go-v2/config v1.27.27
88
github.com/aws/aws-sdk-go-v2/credentials v1.17.27
99
github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.11
1010
github.com/aws/aws-sdk-go-v2/service/acm v1.28.4
1111
github.com/aws/aws-sdk-go-v2/service/appmesh v1.27.7
1212
github.com/aws/aws-sdk-go-v2/service/ec2 v1.173.0
13-
github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2 v1.45.0
13+
github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2 v1.51.0
1414
github.com/aws/aws-sdk-go-v2/service/resourcegroupstaggingapi v1.23.3
1515
github.com/aws/aws-sdk-go-v2/service/servicediscovery v1.31.7
1616
github.com/aws/aws-sdk-go-v2/service/shield v1.27.3
1717
github.com/aws/aws-sdk-go-v2/service/sts v1.30.3
1818
github.com/aws/aws-sdk-go-v2/service/wafregional v1.23.3
1919
github.com/aws/aws-sdk-go-v2/service/wafv2 v1.51.4
20-
github.com/aws/smithy-go v1.22.2
20+
github.com/aws/smithy-go v1.23.0
2121
github.com/evanphx/json-patch v5.9.11+incompatible
2222
github.com/gavv/httpexpect/v2 v2.9.0
2323
github.com/go-logr/logr v1.4.3
@@ -60,8 +60,8 @@ require (
6060
github.com/ajg/form v1.5.1 // indirect
6161
github.com/andybalholm/brotli v1.0.4 // indirect
6262
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 // indirect
63-
github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.34 // indirect
64-
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.34 // indirect
63+
github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.9 // indirect
64+
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.9 // indirect
6565
github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 // indirect
6666
github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3 // indirect
6767
github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.17 // indirect

‎go.sum‎

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@@ -31,6 +31,8 @@ github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2 h1:DklsrG3d
3131
github.com/asaskevich/govalidator v0.0.0-20230301143203-a9d515a09cc2/go.mod h1:WaHUgvxTVq04UNunO+XhnAqY/wQc+bxr74GqbsZ/Jqw=
3232
github.com/aws/aws-sdk-go-v2 v1.36.3 h1:mJoei2CxPutQVxaATCzDUjcZEjVRdpsiiXi2o38yqWM=
3333
github.com/aws/aws-sdk-go-v2 v1.36.3/go.mod h1:LLXuLpgzEbD766Z5ECcRmi8AzSwfZItDtmABVkRLGzg=
34+
github.com/aws/aws-sdk-go-v2 v1.39.2 h1:EJLg8IdbzgeD7xgvZ+I8M1e0fL0ptn/M47lianzth0I=
35+
github.com/aws/aws-sdk-go-v2 v1.39.2/go.mod h1:sDioUELIUO9Znk23YVmIk86/9DOpkbyyVb1i/gUNFXY=
3436
github.com/aws/aws-sdk-go-v2/config v1.27.27 h1:HdqgGt1OAP0HkEDDShEl0oSYa9ZZBSOmKpdpsDMdO90=
3537
github.com/aws/aws-sdk-go-v2/config v1.27.27/go.mod h1:MVYamCg76dFNINkZFu4n4RjDixhVr51HLj4ErWzrVwg=
3638
github.com/aws/aws-sdk-go-v2/credentials v1.17.27 h1:2raNba6gr2IfA0eqqiP2XiQ0UVOpGPgDSi0I9iAP+UI=
@@ -39,8 +41,12 @@ github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.11 h1:KreluoV8FZDEtI6Co2xuNk
3941
github.com/aws/aws-sdk-go-v2/feature/ec2/imds v1.16.11/go.mod h1:SeSUYBLsMYFoRvHE0Tjvn7kbxaUhl75CJi1sbfhMxkU=
4042
github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.34 h1:ZK5jHhnrioRkUNOc+hOgQKlUL5JeC3S6JgLxtQ+Rm0Q=
4143
github.com/aws/aws-sdk-go-v2/internal/configsources v1.3.34/go.mod h1:p4VfIceZokChbA9FzMbRGz5OV+lekcVtHlPKEO0gSZY=
44+
github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.9 h1:se2vOWGD3dWQUtfn4wEjRQJb1HK1XsNIt825gskZ970=
45+
github.com/aws/aws-sdk-go-v2/internal/configsources v1.4.9/go.mod h1:hijCGH2VfbZQxqCDN7bwz/4dzxV+hkyhjawAtdPWKZA=
4246
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.34 h1:SZwFm17ZUNNg5Np0ioo/gq8Mn6u9w19Mri8DnJ15Jf0=
4347
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.6.34/go.mod h1:dFZsC0BLo346mvKQLWmoJxT+Sjp+qcVR1tRVHQGOH9Q=
48+
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.9 h1:6RBnKZLkJM4hQ+kN6E7yWFveOTg8NLPHAkqrs4ZPlTU=
49+
github.com/aws/aws-sdk-go-v2/internal/endpoints/v2 v2.7.9/go.mod h1:V9rQKRmK7AWuEsOMnHzKj8WyrIir1yUJbZxDuZLFvXI=
4450
github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0 h1:hT8rVHwugYE2lEfdFE0QWVo81lF7jMrYJVDWI+f+VxU=
4551
github.com/aws/aws-sdk-go-v2/internal/ini v1.8.0/go.mod h1:8tu/lYfQfFe6IGnaOdrpVgEL2IrrDOf6/m9RQum4NkY=
4652
github.com/aws/aws-sdk-go-v2/service/acm v1.28.4 h1:wiW1Y6/1lysA0eJZRq0I53YYKuV9MNAzL15z2eZRlEE=
@@ -51,6 +57,8 @@ github.com/aws/aws-sdk-go-v2/service/ec2 v1.173.0 h1:ta62lid9JkIpKZtZZXSj6rP2AqY
5157
github.com/aws/aws-sdk-go-v2/service/ec2 v1.173.0/go.mod h1:o6QDjdVKpP5EF0dp/VlvqckzuSDATr1rLdHt3A5m0YY=
5258
github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2 v1.45.0 h1:RB7V8wT9ypjE/YJVBgKjoydTOh4IFoqceGiKxFH70mY=
5359
github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2 v1.45.0/go.mod h1:xnCC3vFBfOKpU6PcsCKL2ktgBTZfOwTGxj6V8/X3IS4=
60+
github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2 v1.51.0 h1:Zy1yjx+R6cR4pAwzFFJ8nWJh4ri8I44H76PDJ77tcJo=
61+
github.com/aws/aws-sdk-go-v2/service/elasticloadbalancingv2 v1.51.0/go.mod h1:RuZwE3p8IrWqK1kZhwH2TymlHLPuiI/taBMb8vrD39Q=
5462
github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3 h1:dT3MqvGhSoaIhRseqw2I0yH81l7wiR2vjs57O51EAm8=
5563
github.com/aws/aws-sdk-go-v2/service/internal/accept-encoding v1.11.3/go.mod h1:GlAeCkHwugxdHaueRr4nhPuY+WW+gR8UjlcqzPr1SPI=
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github.com/aws/aws-sdk-go-v2/service/internal/presigned-url v1.11.17 h1:HGErhhrxZlQ044RiM+WdoZxp0p+EGM62y3L6pwA4olE=
@@ -73,6 +81,8 @@ github.com/aws/aws-sdk-go-v2/service/wafv2 v1.51.4 h1:1khBA5uryBRJoCb4G2iR5RT06B
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github.com/aws/aws-sdk-go-v2/service/wafv2 v1.51.4/go.mod h1:QpFImaPGKNwa+MiZ+oo6LbV1PVQBapc0CnrAMRScoxM=
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github.com/aws/smithy-go v1.22.2 h1:6D9hW43xKFrRx/tXXfAlIZc4JI+yQe6snnWcQyxSyLQ=
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github.com/aws/smithy-go v1.22.2/go.mod h1:irrKGvNn1InZwb2d7fkIRNucdfwR8R+Ts3wxYa/cJHg=
84+
github.com/aws/smithy-go v1.23.0 h1:8n6I3gXzWJB2DxBDnfxgBaSX6oe0d/t10qGz7OKqMCE=
85+
github.com/aws/smithy-go v1.23.0/go.mod h1:t1ufH5HMublsJYulve2RKmHDC15xu1f26kHCp/HgceI=
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github.com/beorn7/perks v1.0.1 h1:VlbKKnNfV8bJzeqoa4cOKqO6bYr3WgKZxO8Z16+hsOM=
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github.com/beorn7/perks v1.0.1/go.mod h1:G2ZrVWU2WbWT9wwq4/hrbKbnv/1ERSJQ0ibhJ6rlkpw=
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github.com/blang/semver/v4 v4.0.0 h1:1PFHFE6yCCTv8C1TeyNNarDzntLi7wMI5i/pzqYIsAM=

‎mkdocs.yml‎

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@@ -44,6 +44,7 @@ nav:
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- Tasks:
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- Cognito Authentication: guide/tasks/cognito_authentication.md
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- SSL Redirect: guide/tasks/ssl_redirect.md
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- URL Rewrite: guide/tasks/url_rewrite.md
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- Use Cases:
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- NLB TLS Termination: guide/use_cases/nlb_tls_termination/index.md
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- Externally Managed Load Balancer: guide/use_cases/self_managed_lb/index.md

‎pkg/annotations/constants.go‎

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IngressSuffixFrontendNlHealthCheckbUnhealthyThresholdCount = "frontend-nlb-healthcheck-unhealthy-threshold-count"
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IngressSuffixFrontendNlbHealthCheckSuccessCodes = "frontend-nlb-healthcheck-success-codes"
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IngressSuffixFrontendNlbTags = "frontend-nlb-tags"
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IngressSuffixUseRegexPathMatch = "use-regex-path-match"
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// NLB annotation suffixes
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// prefixes service.beta.kubernetes.io, service.kubernetes.io

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