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https://github.com/containous/traefik.git
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Add least time load balancing strategy
This commit is contained in:
Simon Delicata
GitHub
@@ -485,6 +485,48 @@ Power of two choices algorithm is a load balancing strategy that selects two ser
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url = "http://private-ip-server-3/"
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```
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## Least-Time
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The Least-Time load balancing algorithm selects the server with the lowest average response time (Time To First Byte - TTFB),
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combined with the fewest active connections, weighted by server capacity.
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This strategy is ideal for heterogeneous backend environments where servers have varying performance characteristics,
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different hardware capabilities, or varying network latency.
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The algorithm continuously measures each backend's response time and tracks active connection counts.
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When routing a request,
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it calculates a score for each healthy server using the formula: `(avg_response_time × (1 + active_connections)) / weight`.
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The server with the lowest score receives the request.
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When multiple servers have identical scores,
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Weighted Round Robin (WRR) with Earliest Deadline First (EDF) scheduling is used as a tie-breaker to ensure fair distribution.
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??? example "Basic Least-Time Load Balancing -- Using the [File Provider](../../../install-configuration/providers/others/file.md)"
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```yaml tab="YAML"
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## Dynamic configuration
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http:
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services:
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my-service:
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loadBalancer:
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strategy: "leasttime"
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servers:
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- url: "http://private-ip-server-1/"
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- url: "http://private-ip-server-2/"
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- url: "http://private-ip-server-3/"
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```
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```toml tab="TOML"
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## Dynamic configuration
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[http.services]
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[http.services.my-service.loadBalancer]
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strategy = "leasttime"
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[[http.services.my-service.loadBalancer.servers]]
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url = "http://private-ip-server-1/"
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[[http.services.my-service.loadBalancer.servers]]
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url = "http://private-ip-server-2/"
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[[http.services.my-service.loadBalancer.servers]]
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url = "http://private-ip-server-3/"
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```
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## Mirroring
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The mirroring is able to mirror requests sent to a service to other services. Please note that by default the whole request is buffered in memory while it is being mirrored. See the `maxBodySize` option in the example below for how to modify this behaviour. You can also omit the request body by setting the `mirrorBody` option to false.
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@@ -57,7 +57,7 @@ spec:
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httpOnly: true
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name: cookie
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secure: true
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strategy: RoundRobin
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strategy: wrr
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weight: 10
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tls:
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# Generate a TLS certificate using a certificate resolver
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@@ -47,7 +47,7 @@ spec:
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httpOnly: true
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name: cookie
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secure: true
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strategy: RoundRobin
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strategy: wrr
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```
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```yaml tab="TraefikService"
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@@ -75,41 +75,41 @@ spec:
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httpOnly: true
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name: cookie
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secure: true
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strategy: RoundRobin
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strategy: wrr
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```
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## Configuration Options
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| Field | Description | Default | Required |
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|:---------------------------------------------------------------------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------------------|:---------|
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| <a id="opt-kind" href="#opt-kind" title="#opt-kind">`kind`</a> | Kind of the service targeted.<br />Two values allowed:<br />- **Service**: Kubernetes Service<br /> **TraefikService**: Traefik Service.<br />More information [here](#externalname-service). | "Service" | No |
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| <a id="opt-name" href="#opt-name" title="#opt-name">`name`</a> | Service name.<br />The character `@` is not authorized. <br />More information [here](#middleware). | | Yes |
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| <a id="opt-namespace" href="#opt-namespace" title="#opt-namespace">`namespace`</a> | Service namespace.<br />Can be empty if the service belongs to the same namespace as the IngressRoute. <br />More information [here](#externalname-service). | | No |
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| <a id="opt-port" href="#opt-port" title="#opt-port">`port`</a> | Service port (number or port name).<br />Evaluated only if the kind is **Service**. | | No |
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| <a id="opt-responseForwarding-flushInterval" href="#opt-responseForwarding-flushInterval" title="#opt-responseForwarding-flushInterval">`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 |
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| <a id="opt-scheme" href="#opt-scheme" title="#opt-scheme">`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 |
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| <a id="opt-serversTransport" href="#opt-serversTransport" title="#opt-serversTransport">`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 |
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| <a id="opt-passHostHeader" href="#opt-passHostHeader" title="#opt-passHostHeader">`passHostHeader`</a> | Forward client Host header to server.<br />Evaluated only if the kind is **Service**. | true | No |
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| <a id="opt-healthCheck-scheme" href="#opt-healthCheck-scheme" title="#opt-healthCheck-scheme">`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](#externalname-service). | "" | No |
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| <a id="opt-healthCheck-mode" href="#opt-healthCheck-mode" title="#opt-healthCheck-mode">`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](#externalname-service). | "http" | No |
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| <a id="opt-healthCheck-path" href="#opt-healthCheck-path" title="#opt-healthCheck-path">`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](#externalname-service). | "" | No |
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| <a id="opt-healthCheck-interval" href="#opt-healthCheck-interval" title="#opt-healthCheck-interval">`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](#externalname-service). | "100ms" | No |
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| <a id="opt-healthCheck-unhealthyInterval" href="#opt-healthCheck-unhealthyInterval" title="#opt-healthCheck-unhealthyInterval">`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](#externalname-service). | "100ms" | No |
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| <a id="opt-healthCheck-method" href="#opt-healthCheck-method" title="#opt-healthCheck-method">`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](#externalname-service). | "GET" | No |
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| <a id="opt-healthCheck-status" href="#opt-healthCheck-status" title="#opt-healthCheck-status">`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 |
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| <a id="opt-healthCheck-port" href="#opt-healthCheck-port" title="#opt-healthCheck-port">`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](#externalname-service). | | No |
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| <a id="opt-healthCheck-timeout" href="#opt-healthCheck-timeout" title="#opt-healthCheck-timeout">`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](#externalname-service). | "5s" | No |
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| <a id="opt-healthCheck-hostname" href="#opt-healthCheck-hostname" title="#opt-healthCheck-hostname">`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](#externalname-service). | "" | No |
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| <a id="opt-healthCheck-followRedirect" href="#opt-healthCheck-followRedirect" title="#opt-healthCheck-followRedirect">`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](#externalname-service). | true | No |
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| <a id="opt-healthCheck-headers" href="#opt-healthCheck-headers" title="#opt-healthCheck-headers">`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](#externalname-service)). | | No |
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| <a id="opt-sticky-cookie-name" href="#opt-sticky-cookie-name" title="#opt-sticky-cookie-name">`sticky.`<br />`cookie.name`</a> | Name of the cookie used for the stickiness.<br />When sticky sessions are enabled, a `Set-Cookie` header is set on the initial response to let the client know which server handles the first response.<br />On subsequent requests, to keep the session alive with the same server, the client should send the cookie with the value set.<br />If the server pecified in the cookie becomes unhealthy, the request will be forwarded to a new server (and the cookie will keep track of the new server).<br />Evaluated only if the kind is **Service**. | "" | No |
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| <a id="opt-sticky-cookie-httpOnly" href="#opt-sticky-cookie-httpOnly" title="#opt-sticky-cookie-httpOnly">`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 |
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| <a id="opt-sticky-cookie-secure" href="#opt-sticky-cookie-secure" title="#opt-sticky-cookie-secure">`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 |
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| <a id="opt-sticky-cookie-sameSite" href="#opt-sticky-cookie-sameSite" title="#opt-sticky-cookie-sameSite">`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 |
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| <a id="opt-sticky-cookie-maxAge" href="#opt-sticky-cookie-maxAge" title="#opt-sticky-cookie-maxAge">`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 |
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| <a id="opt-strategy" href="#opt-strategy" title="#opt-strategy">`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 |
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| <a id="opt-nativeLB" href="#opt-nativeLB" title="#opt-nativeLB">`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 |
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| <a id="opt-nodePortLB" href="#opt-nodePortLB" title="#opt-nodePortLB">`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 |
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| Field | Description | Default | Required |
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|:---------------------------------------------------------------------------------|:---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|:---------------------------------------------------------------------|:---------|
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| <a id="opt-kind" href="#opt-kind" title="#opt-kind">`kind`</a> | Kind of the service targeted.<br />Two values allowed:<br />- **Service**: Kubernetes Service<br /> **TraefikService**: Traefik Service.<br />More information [here](#externalname-service). | "Service" | No |
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| <a id="opt-name" href="#opt-name" title="#opt-name">`name`</a> | Service name.<br />The character `@` is not authorized. <br />More information [here](#middleware). | | Yes |
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| <a id="opt-namespace" href="#opt-namespace" title="#opt-namespace">`namespace`</a> | Service namespace.<br />Can be empty if the service belongs to the same namespace as the IngressRoute. <br />More information [here](#externalname-service). | | No |
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| <a id="opt-port" href="#opt-port" title="#opt-port">`port`</a> | Service port (number or port name).<br />Evaluated only if the kind is **Service**. | | No |
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| <a id="opt-responseForwarding-flushInterval" href="#opt-responseForwarding-flushInterval" title="#opt-responseForwarding-flushInterval">`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 |
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| <a id="opt-scheme" href="#opt-scheme" title="#opt-scheme">`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 |
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| <a id="opt-serversTransport" href="#opt-serversTransport" title="#opt-serversTransport">`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 |
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| <a id="opt-passHostHeader" href="#opt-passHostHeader" title="#opt-passHostHeader">`passHostHeader`</a> | Forward client Host header to server.<br />Evaluated only if the kind is **Service**. | true | No |
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| <a id="opt-healthCheck-scheme" href="#opt-healthCheck-scheme" title="#opt-healthCheck-scheme">`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](#externalname-service). | "" | No |
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| <a id="opt-healthCheck-mode" href="#opt-healthCheck-mode" title="#opt-healthCheck-mode">`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](#externalname-service). | "http" | No |
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| <a id="opt-healthCheck-path" href="#opt-healthCheck-path" title="#opt-healthCheck-path">`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](#externalname-service). | "" | No |
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| <a id="opt-healthCheck-interval" href="#opt-healthCheck-interval" title="#opt-healthCheck-interval">`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](#externalname-service). | "100ms" | No |
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| <a id="opt-healthCheck-unhealthyInterval" href="#opt-healthCheck-unhealthyInterval" title="#opt-healthCheck-unhealthyInterval">`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](#externalname-service). | "100ms" | No |
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| <a id="opt-healthCheck-method" href="#opt-healthCheck-method" title="#opt-healthCheck-method">`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](#externalname-service). | "GET" | No |
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| <a id="opt-healthCheck-status" href="#opt-healthCheck-status" title="#opt-healthCheck-status">`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 |
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| <a id="opt-healthCheck-port" href="#opt-healthCheck-port" title="#opt-healthCheck-port">`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](#externalname-service). | | No |
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| <a id="opt-healthCheck-timeout" href="#opt-healthCheck-timeout" title="#opt-healthCheck-timeout">`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](#externalname-service). | "5s" | No |
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| <a id="opt-healthCheck-hostname" href="#opt-healthCheck-hostname" title="#opt-healthCheck-hostname">`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](#externalname-service). | "" | No |
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| <a id="opt-healthCheck-followRedirect" href="#opt-healthCheck-followRedirect" title="#opt-healthCheck-followRedirect">`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](#externalname-service). | true | No |
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| <a id="opt-healthCheck-headers" href="#opt-healthCheck-headers" title="#opt-healthCheck-headers">`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](#externalname-service)). | | No |
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| <a id="opt-sticky-cookie-name" href="#opt-sticky-cookie-name" title="#opt-sticky-cookie-name">`sticky.`<br />`cookie.name`</a> | Name of the cookie used for the stickiness.<br />When sticky sessions are enabled, a `Set-Cookie` header is set on the initial response to let the client know which server handles the first response.<br />On subsequent requests, to keep the session alive with the same server, the client should send the cookie with the value set.<br />If the server pecified in the cookie becomes unhealthy, the request will be forwarded to a new server (and the cookie will keep track of the new server).<br />Evaluated only if the kind is **Service**. | "" | No |
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| <a id="opt-sticky-cookie-httpOnly" href="#opt-sticky-cookie-httpOnly" title="#opt-sticky-cookie-httpOnly">`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 |
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| <a id="opt-sticky-cookie-secure" href="#opt-sticky-cookie-secure" title="#opt-sticky-cookie-secure">`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 |
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| <a id="opt-sticky-cookie-sameSite" href="#opt-sticky-cookie-sameSite" title="#opt-sticky-cookie-sameSite">`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 |
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| <a id="opt-sticky-cookie-maxAge" href="#opt-sticky-cookie-maxAge" title="#opt-sticky-cookie-maxAge">`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 |
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| <a id="opt-strategy" href="#opt-strategy" title="#opt-strategy">`strategy`</a> | Strategy defines the load balancing strategy between the servers.<br />Supported values are: wrr (Weighed round-robin), p2c (Power of two choices), hrw (Highest Random Weight), and leasttime (Least-Time).<br />Evaluated only if the kind is **Service**. | "RoundRobin" | No |
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| <a id="opt-nativeLB" href="#opt-nativeLB" title="#opt-nativeLB">`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 |
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| <a id="opt-nodePortLB" href="#opt-nodePortLB" title="#opt-nodePortLB">`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 |
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### ExternalName Service
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