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feat: add highest random weight in kubernetes CRD

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Landry Benguigui 2025-09-19 10:18:04 +02:00 • committed by GitHub
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252
docs/content/reference/dynamic-configuration/kubernetes-crd-definition-v1.yml
View file

@ -331,11 +331,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
@ -1292,11 +1293,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
@ -2791,6 +2793,243 @@ spec:
spec:
description: TraefikServiceSpec defines the desired state of a TraefikService.
properties:
highestRandomWeight:
description: HighestRandomWeight defines the highest random weight
service configuration.
properties:
services:
description: Services defines the list of Kubernetes Service and/or
TraefikService to load-balance, with weight.
items:
description: Service defines an upstream HTTP service to proxy
traffic to.
properties:
healthCheck:
description: Healthcheck defines health checks for ExternalName
services.
properties:
followRedirects:
description: |-
FollowRedirects defines whether redirects should be followed during the health check calls.
Default: true
type: boolean
headers:
additionalProperties:
type: string
description: Headers defines custom headers to be sent
to the health check endpoint.
type: object
hostname:
description: Hostname defines the value of hostname
in the Host header of the health check request.
type: string
interval:
anyOf:
- type: integer
- type: string
description: |-
Interval defines the frequency of the health check calls for healthy targets.
Default: 30s
x-kubernetes-int-or-string: true
method:
description: Method defines the healthcheck method.
type: string
mode:
description: |-
Mode defines the health check mode.
If defined to grpc, will use the gRPC health check protocol to probe the server.
Default: http
type: string
path:
description: Path defines the server URL path for the
health check endpoint.
type: string
port:
description: Port defines the server URL port for the
health check endpoint.
type: integer
scheme:
description: Scheme replaces the server URL scheme for
the health check endpoint.
type: string
status:
description: Status defines the expected HTTP status
code of the response to the health check request.
type: integer
timeout:
anyOf:
- type: integer
- type: string
description: |-
Timeout defines the maximum duration Traefik will wait for a health check request before considering the server unhealthy.
Default: 5s
x-kubernetes-int-or-string: true
unhealthyInterval:
anyOf:
- type: integer
- type: string
description: |-
UnhealthyInterval defines the frequency of the health check calls for unhealthy targets.
When UnhealthyInterval is not defined, it defaults to the Interval value.
Default: 30s
x-kubernetes-int-or-string: true
type: object
kind:
description: Kind defines the kind of the Service.
enum:
- Service
- TraefikService
type: string
name:
description: |-
Name defines the name of the referenced Kubernetes Service or TraefikService.
The differentiation between the two is specified in the Kind field.
type: string
namespace:
description: Namespace defines the namespace of the referenced
Kubernetes Service or TraefikService.
type: string
nativeLB:
description: |-
NativeLB controls, when creating the load-balancer,
whether the LB's children are directly the pods IPs or if the only child is the Kubernetes Service clusterIP.
The Kubernetes Service itself does load-balance to the pods.
By default, NativeLB is false.
type: boolean
nodePortLB:
description: |-
NodePortLB controls, when creating the load-balancer,
whether the LB's children are directly the nodes internal IPs using the nodePort when the service type is NodePort.
It allows services to be reachable when Traefik runs externally from the Kubernetes cluster but within the same network of the nodes.
By default, NodePortLB is false.
type: boolean
passHostHeader:
description: |-
PassHostHeader defines whether the client Host header is forwarded to the upstream Kubernetes Service.
By default, passHostHeader is true.
type: boolean
passiveHealthCheck:
description: PassiveHealthCheck defines passive health checks
for ExternalName services.
properties:
failureWindow:
anyOf:
- type: integer
- type: string
description: FailureWindow defines the time window during
which the failed attempts must occur for the server
to be marked as unhealthy. It also defines for how
long the server will be considered unhealthy.
x-kubernetes-int-or-string: true
maxFailedAttempts:
description: MaxFailedAttempts is the number of consecutive
failed attempts allowed within the failure window
before marking the server as unhealthy.
type: integer
type: object
port:
anyOf:
- type: integer
- type: string
description: |-
Port defines the port of a Kubernetes Service.
This can be a reference to a named port.
x-kubernetes-int-or-string: true
responseForwarding:
description: ResponseForwarding defines how Traefik forwards
the response from the upstream Kubernetes Service to the
client.
properties:
flushInterval:
description: |-
FlushInterval defines the interval, in milliseconds, in between flushes to the client while copying the response body.
A negative value means to flush immediately after each write to the client.
This configuration is ignored when ReverseProxy recognizes a response as a streaming response;
for such responses, writes are flushed to the client immediately.
Default: 100ms
type: string
type: object
scheme:
description: |-
Scheme defines the scheme to use for the request to the upstream Kubernetes Service.
It defaults to https when Kubernetes Service port is 443, http otherwise.
type: string
serversTransport:
description: |-
ServersTransport defines the name of ServersTransport resource to use.
It allows to configure the transport between Traefik and your servers.
Can only be used on a Kubernetes Service.
type: string
sticky:
description: |-
Sticky defines the sticky sessions configuration.
More info: https://doc.traefik.io/traefik/v3.5/routing/services/#sticky-sessions
properties:
cookie:
description: Cookie defines the sticky cookie configuration.
properties:
domain:
description: |-
Domain defines the host to which the cookie will be sent.
More info: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#domaindomain-value
type: string
httpOnly:
description: HTTPOnly defines whether the cookie
can be accessed by client-side APIs, such as JavaScript.
type: boolean
maxAge:
description: |-
MaxAge defines the number of seconds until the cookie expires.
When set to a negative number, the cookie expires immediately.
When set to zero, the cookie never expires.
type: integer
name:
description: Name defines the Cookie name.
type: string
path:
description: |-
Path defines the path that must exist in the requested URL for the browser to send the Cookie header.
When not provided the cookie will be sent on every request to the domain.
More info: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#pathpath-value
type: string
sameSite:
description: |-
SameSite defines the same site policy.
More info: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite
enum:
- none
- lax
- strict
type: string
secure:
description: Secure defines whether the cookie can
only be transmitted over an encrypted connection
(i.e. HTTPS).
type: boolean
type: object
type: object
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
description: |-
Weight defines the weight and should only be specified when Name references a TraefikService object
(and to be precise, one that embeds a Weighted Round Robin).
minimum: 0
type: integer
required:
- name
type: object
type: array
type: object
mirroring:
description: Mirroring defines the Mirroring service configuration.
properties:
@ -3100,11 +3339,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
@ -3246,11 +3486,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
@ -3479,11 +3720,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:

3
docs/content/reference/dynamic-configuration/traefik.io_ingressroutes.yaml
View file

@ -331,11 +331,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:

3
docs/content/reference/dynamic-configuration/traefik.io_middlewares.yaml
View file

@ -484,11 +484,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:

246
docs/content/reference/dynamic-configuration/traefik.io_traefikservices.yaml
View file

@ -44,6 +44,243 @@ spec:
spec:
description: TraefikServiceSpec defines the desired state of a TraefikService.
properties:
highestRandomWeight:
description: HighestRandomWeight defines the highest random weight
service configuration.
properties:
services:
description: Services defines the list of Kubernetes Service and/or
TraefikService to load-balance, with weight.
items:
description: Service defines an upstream HTTP service to proxy
traffic to.
properties:
healthCheck:
description: Healthcheck defines health checks for ExternalName
services.
properties:
followRedirects:
description: |-
FollowRedirects defines whether redirects should be followed during the health check calls.
Default: true
type: boolean
headers:
additionalProperties:
type: string
description: Headers defines custom headers to be sent
to the health check endpoint.
type: object
hostname:
description: Hostname defines the value of hostname
in the Host header of the health check request.
type: string
interval:
anyOf:
- type: integer
- type: string
description: |-
Interval defines the frequency of the health check calls for healthy targets.
Default: 30s
x-kubernetes-int-or-string: true
method:
description: Method defines the healthcheck method.
type: string
mode:
description: |-
Mode defines the health check mode.
If defined to grpc, will use the gRPC health check protocol to probe the server.
Default: http
type: string
path:
description: Path defines the server URL path for the
health check endpoint.
type: string
port:
description: Port defines the server URL port for the
health check endpoint.
type: integer
scheme:
description: Scheme replaces the server URL scheme for
the health check endpoint.
type: string
status:
description: Status defines the expected HTTP status
code of the response to the health check request.
type: integer
timeout:
anyOf:
- type: integer
- type: string
description: |-
Timeout defines the maximum duration Traefik will wait for a health check request before considering the server unhealthy.
Default: 5s
x-kubernetes-int-or-string: true
unhealthyInterval:
anyOf:
- type: integer
- type: string
description: |-
UnhealthyInterval defines the frequency of the health check calls for unhealthy targets.
When UnhealthyInterval is not defined, it defaults to the Interval value.
Default: 30s
x-kubernetes-int-or-string: true
type: object
kind:
description: Kind defines the kind of the Service.
enum:
- Service
- TraefikService
type: string
name:
description: |-
Name defines the name of the referenced Kubernetes Service or TraefikService.
The differentiation between the two is specified in the Kind field.
type: string
namespace:
description: Namespace defines the namespace of the referenced
Kubernetes Service or TraefikService.
type: string
nativeLB:
description: |-
NativeLB controls, when creating the load-balancer,
whether the LB's children are directly the pods IPs or if the only child is the Kubernetes Service clusterIP.
The Kubernetes Service itself does load-balance to the pods.
By default, NativeLB is false.
type: boolean
nodePortLB:
description: |-
NodePortLB controls, when creating the load-balancer,
whether the LB's children are directly the nodes internal IPs using the nodePort when the service type is NodePort.
It allows services to be reachable when Traefik runs externally from the Kubernetes cluster but within the same network of the nodes.
By default, NodePortLB is false.
type: boolean
passHostHeader:
description: |-
PassHostHeader defines whether the client Host header is forwarded to the upstream Kubernetes Service.
By default, passHostHeader is true.
type: boolean
passiveHealthCheck:
description: PassiveHealthCheck defines passive health checks
for ExternalName services.
properties:
failureWindow:
anyOf:
- type: integer
- type: string
description: FailureWindow defines the time window during
which the failed attempts must occur for the server
to be marked as unhealthy. It also defines for how
long the server will be considered unhealthy.
x-kubernetes-int-or-string: true
maxFailedAttempts:
description: MaxFailedAttempts is the number of consecutive
failed attempts allowed within the failure window
before marking the server as unhealthy.
type: integer
type: object
port:
anyOf:
- type: integer
- type: string
description: |-
Port defines the port of a Kubernetes Service.
This can be a reference to a named port.
x-kubernetes-int-or-string: true
responseForwarding:
description: ResponseForwarding defines how Traefik forwards
the response from the upstream Kubernetes Service to the
client.
properties:
flushInterval:
description: |-
FlushInterval defines the interval, in milliseconds, in between flushes to the client while copying the response body.
A negative value means to flush immediately after each write to the client.
This configuration is ignored when ReverseProxy recognizes a response as a streaming response;
for such responses, writes are flushed to the client immediately.
Default: 100ms
type: string
type: object
scheme:
description: |-
Scheme defines the scheme to use for the request to the upstream Kubernetes Service.
It defaults to https when Kubernetes Service port is 443, http otherwise.
type: string
serversTransport:
description: |-
ServersTransport defines the name of ServersTransport resource to use.
It allows to configure the transport between Traefik and your servers.
Can only be used on a Kubernetes Service.
type: string
sticky:
description: |-
Sticky defines the sticky sessions configuration.
More info: https://doc.traefik.io/traefik/v3.5/routing/services/#sticky-sessions
properties:
cookie:
description: Cookie defines the sticky cookie configuration.
properties:
domain:
description: |-
Domain defines the host to which the cookie will be sent.
More info: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#domaindomain-value
type: string
httpOnly:
description: HTTPOnly defines whether the cookie
can be accessed by client-side APIs, such as JavaScript.
type: boolean
maxAge:
description: |-
MaxAge defines the number of seconds until the cookie expires.
When set to a negative number, the cookie expires immediately.
When set to zero, the cookie never expires.
type: integer
name:
description: Name defines the Cookie name.
type: string
path:
description: |-
Path defines the path that must exist in the requested URL for the browser to send the Cookie header.
When not provided the cookie will be sent on every request to the domain.
More info: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie#pathpath-value
type: string
sameSite:
description: |-
SameSite defines the same site policy.
More info: https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite
enum:
- none
- lax
- strict
type: string
secure:
description: Secure defines whether the cookie can
only be transmitted over an encrypted connection
(i.e. HTTPS).
type: boolean
type: object
type: object
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
description: |-
Weight defines the weight and should only be specified when Name references a TraefikService object
(and to be precise, one that embeds a Weighted Round Robin).
minimum: 0
type: integer
required:
- name
type: object
type: array
type: object
mirroring:
description: Mirroring defines the Mirroring service configuration.
properties:
@ -353,11 +590,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
@ -499,11 +737,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:
@ -732,11 +971,12 @@ spec:
strategy:
description: |-
Strategy defines the load balancing strategy between the servers.
Supported values are: wrr (Weighed round-robin) and p2c (Power of two choices).
Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), and hrw (Highest Random Weight).
RoundRobin value is deprecated and supported for backward compatibility.
enum:
- wrr
- p2c
- hrw
- RoundRobin
type: string
weight:

140
docs/content/reference/routing-configuration/kubernetes/crd/http/traefikservice.md
View file

@ -3,11 +3,12 @@ title: "Traefik Kubernetes Services Documentation"
description: "Learn how to configure routing and load balancing in Traefik Proxy to reach Services, which handle incoming requests. Read the technical documentation."
---
A `TraefikService` is a custom resource that sits on top of the Kubernetes Services. It enables advanced load-balancing features such as a [Weighted Round Robin](#weighted-round-robin) load balancing or a [Mirroring](#mirroring) between your Kubernetes Services.
A `TraefikService` is a custom resource that sits on top of the Kubernetes Services. It enables advanced load-balancing features such as a [Weighted Round Robin](#weighted-round-robin) load balancing, a [Highest Random Weight](#highest-random-weight) load balancing, or a [Mirroring](#mirroring) between your Kubernetes Services.
Services configure how to reach the actual endpoints that will eventually handle incoming requests. In Traefik, the target service can be either a standard [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/)—which exposes a pod—or a TraefikService. The latter allows you to combine advanced load-balancing options like:
- [Weighted Round Robin load balancing](#weighted-round-robin).
- [Highest Random Weight load balancing](#highest-random-weight).
- [Mirroring](#mirroring).
## Weighted Round Robin
@ -255,6 +256,143 @@ In the example above, to keep a session open with the same server, the client wo
curl -H Host:example.com -b "lvl1=default-whoami1-80; lvl2=http://10.42.0.6:80" http://localhost:8000/foo
```
## Highest Random Weight
The HRW (Highest Random Weight) load balancer uses consistent hashing to ensure that requests from the same client IP are always routed to the same service. Unlike weighted round-robin which distributes requests based on weights, HRW provides consistent routing based on the client's remote address.
This is particularly useful for maintaining session affinity without requiring sticky cookies, as clients will consistently reach the same backend service based on their IP address.
### Configuration Example
```yaml tab="IngressRoute"
apiVersion: traefik.io/v1alpha1
kind: IngressRoute
metadata:
name: test-hrw
namespace: apps
spec:
entryPoints:
- websecure
routes:
- match: Host(`example.com`) && PathPrefix(`/app`)
kind: Rule
services:
# Set an HRW TraefikService
- name: hrw1
namespace: apps
kind: TraefikService
tls:
secretName: supersecret
```
```yaml tab="TraefikService HRW"
apiVersion: traefik.io/v1alpha1
kind: TraefikService
metadata:
name: hrw1
namespace: apps
spec:
highestRandomWeight:
services:
# Kubernetes Service with weight 10
- name: svc1
namespace: apps
port: 80
weight: 10
# Kubernetes Service with weight 20
- name: svc2
namespace: apps
port: 80
weight: 20
# Another TraefikService
- name: wrr1
namespace: apps
kind: TraefikService
weight: 15
```
```yaml tab="Kubernetes Services"
apiVersion: v1
kind: Service
metadata:
name: svc1
namespace: apps
spec:
ports:
- name: http
port: 80
selector:
app: traefiklabs
task: app1
---
apiVersion: v1
kind: Service
metadata:
name: svc2
namespace: apps
spec:
ports:
- name: http
port: 80
selector:
app: traefiklabs
task: app2
```
### Configuration Options
| Field | Description | Default | Required |
|:---------------------------------------------------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------------------|:---------|
| <a id="hrw-services" href="#hrw-services" title="#hrw-services">`services`</a> | List of any combination of TraefikService and [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/). Each service must have a weight assigned. | | Yes |
| <a id="hrw-servicesm-kind" href="#hrw-servicesm-kind" title="#hrw-servicesm-kind">`services[m].`<br />`kind`</a> | Kind of the service targeted.<br />Two values allowed:<br />- **Service**: Kubernetes Service<br /> - **TraefikService**: Traefik Service. | "" | No |
| <a id="hrw-servicesm-name" href="#hrw-servicesm-name" title="#hrw-servicesm-name">`services[m].`<br />`name`</a> | Service name.<br />The character `@` is not authorized. | "" | Yes |
| <a id="hrw-servicesm-namespace" href="#hrw-servicesm-namespace" title="#hrw-servicesm-namespace">`services[m].`<br />`namespace`</a> | Service namespace. | "" | No |
| <a id="hrw-servicesm-port" href="#hrw-servicesm-port" title="#hrw-servicesm-port">`services[m].`<br />`port`</a> | Service port (number or port name).<br />Evaluated only if the kind is **Service**. | "" | No |
| <a id="hrw-servicesm-weight" href="#hrw-servicesm-weight" title="#hrw-servicesm-weight">`services[m].`<br />`weight`</a> | Service weight used in the HRW algorithm. Higher weights increase the probability of selection for a given client IP. | 1 | No |
| <a id="hrw-servicesm-responseForwarding-flushInterval" href="#hrw-servicesm-responseForwarding-flushInterval" title="#hrw-servicesm-responseForwarding-flushInterval">`services[m].`<br />`responseForwarding.`<br />`flushInterval`</a> | Interval, in milliseconds, in between flushes to the client while copying the response body.<br />A negative value means to flush immediately after each write to the client.<br />This configuration is ignored when a response is a streaming response; for such responses, writes are flushed to the client immediately.<br />Evaluated only if the kind is **Service**. | 100ms | No |
| <a id="hrw-servicesm-scheme" href="#hrw-servicesm-scheme" title="#hrw-servicesm-scheme">`services[m].`<br />`scheme`</a> | Scheme to use for the request to the upstream Kubernetes Service.<br />Evaluated only if the kind is **Service**. | "http"<br />"https" if `port` is 443 or contains the string *https*. | No |
| <a id="hrw-servicesm-serversTransport" href="#hrw-servicesm-serversTransport" title="#hrw-servicesm-serversTransport">`services[m].`<br />`serversTransport`</a> | Name of ServersTransport resource to use to configure the transport between Traefik and your servers.<br />Evaluated only if the kind is **Service**. | "" | No |
| <a id="hrw-servicesm-passHostHeader" href="#hrw-servicesm-passHostHeader" title="#hrw-servicesm-passHostHeader">`services[m].`<br />`passHostHeader`</a> | Forward client Host header to server.<br />Evaluated only if the kind is **Service**. | true | No |
| <a id="hrw-servicesm-healthCheck-scheme" href="#hrw-servicesm-healthCheck-scheme" title="#hrw-servicesm-healthCheck-scheme">`services[m].`<br />`healthCheck.scheme`</a> | Server URL scheme for the health check endpoint.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "" | No |
| <a id="hrw-servicesm-healthCheck-mode" href="#hrw-servicesm-healthCheck-mode" title="#hrw-servicesm-healthCheck-mode">`services[m].`<br />`healthCheck.mode`</a> | Health check mode.<br /> If defined to grpc, will use the gRPC health check protocol to probe the server.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "http" | No |
| <a id="hrw-servicesm-healthCheck-path" href="#hrw-servicesm-healthCheck-path" title="#hrw-servicesm-healthCheck-path">`services[m].`<br />`healthCheck.path`</a> | Server URL path for the health check endpoint.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "" | No |
| <a id="hrw-servicesm-healthCheck-interval" href="#hrw-servicesm-healthCheck-interval" title="#hrw-servicesm-healthCheck-interval">`services[m].`<br />`healthCheck.interval`</a> | Frequency of the health check calls for healthy targets.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "100ms" | No |
| <a id="hrw-servicesm-healthCheck-unhealthyInterval" href="#hrw-servicesm-healthCheck-unhealthyInterval" title="#hrw-servicesm-healthCheck-unhealthyInterval">`services[m].`<br />`healthCheck.unhealthyInterval`</a> | Frequency of the health check calls for unhealthy targets.<br />When not defined, it defaults to the `interval` value.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "100ms" | No |
| <a id="hrw-servicesm-healthCheck-method" href="#hrw-servicesm-healthCheck-method" title="#hrw-servicesm-healthCheck-method">`services[m].`<br />`healthCheck.method`</a> | HTTP method for the health check endpoint.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "GET" | No |
| <a id="hrw-servicesm-healthCheck-status" href="#hrw-servicesm-healthCheck-status" title="#hrw-servicesm-healthCheck-status">`services[m].`<br />`healthCheck.status`</a> | Expected HTTP status code of the response to the health check request.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type ExternalName.<br />If not set, expect a status between 200 and 399.<br />Evaluated only if the kind is **Service**. | | No |
| <a id="hrw-servicesm-healthCheck-port" href="#hrw-servicesm-healthCheck-port" title="#hrw-servicesm-healthCheck-port">`services[m].`<br />`healthCheck.port`</a> | URL port for the health check endpoint.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | | No |
| <a id="hrw-servicesm-healthCheck-timeout" href="#hrw-servicesm-healthCheck-timeout" title="#hrw-servicesm-healthCheck-timeout">`services[m].`<br />`healthCheck.timeout`</a> | Maximum duration to wait before considering the server unhealthy.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "5s" | No |
| <a id="hrw-servicesm-healthCheck-hostname" href="#hrw-servicesm-healthCheck-hostname" title="#hrw-servicesm-healthCheck-hostname">`services[m].`<br />`healthCheck.hostname`</a> | Value in the Host header of the health check request.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | "" | No |
| <a id="hrw-servicesm-healthCheck-followRedirect" href="#hrw-servicesm-healthCheck-followRedirect" title="#hrw-servicesm-healthCheck-followRedirect">`services[m].`<br />`healthCheck.`<br />`followRedirect`</a> | Follow the redirections during the healtchcheck.<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | true | No |
| <a id="hrw-servicesm-healthCheck-headers" href="#hrw-servicesm-healthCheck-headers" title="#hrw-servicesm-healthCheck-headers">`services[m].`<br />`healthCheck.headers`</a> | Map of header to send to the health check endpoint<br />Evaluated only if the kind is **Service**.<br />Only for [Kubernetes service](https://kubernetes.io/docs/concepts/services-networking/service/) of type `ExternalName`. | | No |
| <a id="hrw-servicesm-sticky-cookie-name" href="#hrw-servicesm-sticky-cookie-name" title="#hrw-servicesm-sticky-cookie-name">`services[m].`<br />`sticky.`<br />`cookie.name`</a> | Name of the cookie used for the stickiness.<br />Evaluated only if the kind is **Service**. | Abbreviation of a sha1<br />(ex: `_1d52e`). | No |
| <a id="hrw-servicesm-sticky-cookie-httpOnly" href="#hrw-servicesm-sticky-cookie-httpOnly" title="#hrw-servicesm-sticky-cookie-httpOnly">`services[m].`<br />`sticky.`<br />`cookie.httpOnly`</a> | Allow the cookie can be accessed by client-side APIs, such as JavaScript.<br />Evaluated only if the kind is **Service**. | false | No |
| <a id="hrw-servicesm-sticky-cookie-secure" href="#hrw-servicesm-sticky-cookie-secure" title="#hrw-servicesm-sticky-cookie-secure">`services[m].`<br />`sticky.`<br />`cookie.secure`</a> | Allow the cookie can only be transmitted over an encrypted connection (i.e. HTTPS).<br />Evaluated only if the kind is **Service**. | false | No |
| <a id="hrw-servicesm-sticky-cookie-sameSite" href="#hrw-servicesm-sticky-cookie-sameSite" title="#hrw-servicesm-sticky-cookie-sameSite">`services[m].`<br />`sticky.`<br />`cookie.sameSite`</a> | [SameSite](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Set-Cookie/SameSite) policy.<br />Allowed values:<br />-`none`<br />-`lax`<br />`strict`<br />Evaluated only if the kind is **Service**. | "" | No |
| <a id="hrw-servicesm-sticky-cookie-maxAge" href="#hrw-servicesm-sticky-cookie-maxAge" title="#hrw-servicesm-sticky-cookie-maxAge">`services[m].`<br />`sticky.`<br />`cookie.maxAge`</a> | Number of seconds until the cookie expires.<br />Negative number, the cookie expires immediately.<br />0, the cookie never expires.<br />Evaluated only if the kind is **Service**. | 0 | No |
| <a id="hrw-servicesm-strategy" href="#hrw-servicesm-strategy" title="#hrw-servicesm-strategy">`services[m].`<br />`strategy`</a> | Load balancing strategy between the servers.<br />RoundRobin is the only supported value yet.<br />Evaluated only if the kind is **Service**. | "RoundRobin" | No |
| <a id="hrw-servicesm-nativeLB" href="#hrw-servicesm-nativeLB" title="#hrw-servicesm-nativeLB">`services[m].`<br />`nativeLB`</a> | Allow using the Kubernetes Service load balancing between the pods instead of the one provided by Traefik.<br />Evaluated only if the kind is **Service**. | false | No |
| <a id="hrw-servicesm-nodePortLB" href="#hrw-servicesm-nodePortLB" title="#hrw-servicesm-nodePortLB">`services[m].`<br />`nodePortLB`</a> | Use the nodePort IP address when the service type is NodePort.<br />It allows services to be reachable when Traefik runs externally from the Kubernetes cluster but within the same network of the nodes.<br />Evaluated only if the kind is **Service**. | false | No |
### How HRW Works
The Highest Random Weight algorithm combines consistent hashing with weighted load balancing:
1. **Consistent Hashing**: For each incoming request, the client's remote address is hashed to ensure consistent routing.
2. **Weighted Selection**: Each service is assigned a random value based on both the hash of the client IP and the service's weight.
3. **Highest Selection**: The service with the highest calculated value receives the request.
This approach provides several benefits:
- **Session Affinity**: Clients consistently reach the same backend service
- **Weighted Distribution**: Services with higher weights are more likely to be selected
- **No State Required**: Unlike sticky cookies, no client-side or server-side state is needed
- **Fault Tolerance**: If a service becomes unavailable, requests are redistributed consistently among remaining services
## Mirroring
The mirroring is able to mirror requests sent to a service to other services.