Stickiness documentation
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Ludovic Fernandez
Traefiker
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8 changed files with 102 additions and 61 deletions
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@ -346,12 +346,33 @@ For example:
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- Another possible value for `extractorfunc` is `client.ip` which will categorize requests based on client source ip.
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- Lastly `extractorfunc` can take the value of `request.header.ANY_HEADER` which will categorize requests based on `ANY_HEADER` that you provide.
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### Sticky sessions
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Sticky sessions are supported with both load balancers.
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When sticky sessions are enabled, a cookie called `_TRAEFIK_BACKEND` is set on the initial request.
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When sticky sessions are enabled, a cookie is set on the initial request.
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The default cookie name is an abbreviation of a sha1 (ex: `_1d52e`).
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On subsequent requests, the client will be directed to the backend stored in the cookie if it is still healthy.
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If not, a new backend will be assigned.
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For example:
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To activate sticky session:
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```toml
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[backends]
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[backends.backend1]
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[backends.backend1.loadbalancer.stickiness]
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```
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To customize the cookie name:
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```toml
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[backends]
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[backends.backend1]
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[backends.backend1.loadbalancer.stickiness]
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cookieName = "my_cookie"
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```
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The deprecated way:
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```toml
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[backends]
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[backends.backend1]
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@ -359,6 +380,8 @@ For example:
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sticky = true
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```
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### Health Check
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A health check can be configured in order to remove a backend from LB rotation as long as it keeps returning HTTP status codes other than `200 OK` to HTTP GET requests periodically carried out by Traefik.
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The check is defined by a pathappended to the backend URL and an interval (given in a format understood by [time.ParseDuration](https://golang.org/pkg/time/#ParseDuration)) specifying how often the health check should be executed (the default being 30 seconds).
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Each backend must respond to the health check within 5 seconds.
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@ -118,12 +118,11 @@ To enable constraints see [backend-specific constraints section](/configuration/
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Additional settings can be defined using Consul Catalog tags.
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| Tag | Description |
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|---------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|-----------------------------------------------------------|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `traefik.enable=false` | Disable this container in Træfik |
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| `traefik.protocol=https` | Override the default `http` protocol |
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| `traefik.backend.weight=10` | Assign this weight to the container |
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| `traefik.backend.circuitbreaker=EXPR` | Create a [circuit breaker](/basics/#backends) to be used against the backend, ex: `NetworkErrorRatio() > 0.` |
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| `traefik.backend.loadbalancer=drr` | Override the default load balancing mode |
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| `traefik.backend.maxconn.amount=10` | Set a maximum number of connections to the backend. Must be used in conjunction with the below label to take effect. |
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| `traefik.backend.maxconn.extractorfunc=client.ip` | Set the function to be used against the request to determine what to limit maximum connections to the backend by. Must be used in conjunction with the above label to take effect. |
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| `traefik.frontend.rule=Host:test.traefik.io` | Override the default frontend rule (Default: `Host:{{.ServiceName}}.{{.Domain}}`). |
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@ -131,3 +130,7 @@ Additional settings can be defined using Consul Catalog tags.
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| `traefik.frontend.priority=10` | Override default frontend priority |
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| `traefik.frontend.entryPoints=http,https` | Assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`. |
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| `traefik.frontend.auth.basic=EXPR` | Sets basic authentication for that frontend in CSV format: `User:Hash,User:Hash` |
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| `traefik.backend.loadbalancer=drr` | override the default `wrr` load balancer algorithm |
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| `traefik.backend.loadbalancer.stickiness=true` | enable backend sticky sessions |
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| `traefik.backend.loadbalancer.stickiness.cookieName=NAME` | Manually set the cookie name for sticky sessions |
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| `traefik.backend.loadbalancer.sticky=true` | enable backend sticky sessions (DEPRECATED) |
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@ -149,12 +149,14 @@ To enable constraints see [backend-specific constraints section](/configuration/
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Labels can be used on containers to override default behaviour.
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| Label | Description |
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|---------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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|-----------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
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| `traefik.backend=foo` | Give the name `foo` to the generated backend for this container. |
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| `traefik.backend.maxconn.amount=10` | Set a maximum number of connections to the backend. Must be used in conjunction with the below label to take effect. |
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| `traefik.backend.maxconn.extractorfunc=client.ip` | Set the function to be used against the request to determine what to limit maximum connections to the backend by. Must be used in conjunction with the above label to take effect. |
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| `traefik.backend.loadbalancer.method=drr` | Override the default `wrr` load balancer algorithm |
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| `traefik.backend.loadbalancer.sticky=true` | Enable backend sticky sessions |
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| `traefik.backend.loadbalancer.stickiness=true` | Enable backend sticky sessions |
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| `traefik.backend.loadbalancer.stickiness.cookieName=NAME` | Manually set the cookie name for sticky sessions |
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| `traefik.backend.loadbalancer.sticky=true` | Enable backend sticky sessions (DEPRECATED) |
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| `traefik.backend.loadbalancer.swarm=true` | Use Swarm's inbuilt load balancer (only relevant under Swarm Mode). |
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| `traefik.backend.circuitbreaker.expression=EXPR` | Create a [circuit breaker](/basics/#backends) to be used against the backend |
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| `traefik.port=80` | Register this port. Useful when the container exposes multiples ports. |
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@ -125,12 +125,14 @@ Træfik needs the following policy to read ECS information:
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Labels can be used on task containers to override default behaviour:
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| Label | Description |
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|---------------------------------------------------|------------------------------------------------------------------------------------------|
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|-----------------------------------------------------------|------------------------------------------------------------------------------------------|
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| `traefik.protocol=https` | override the default `http` protocol |
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| `traefik.weight=10` | assign this weight to the container |
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| `traefik.enable=false` | disable this container in Træfik |
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| `traefik.backend.loadbalancer.method=drr` | override the default `wrr` load balancer algorithm |
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| `traefik.backend.loadbalancer.sticky=true` | enable backend sticky sessions |
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| `traefik.backend.loadbalancer.stickiness=true` | enable backend sticky sessions |
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| `traefik.backend.loadbalancer.stickiness.cookieName=NAME` | Manually set the cookie name for sticky sessions |
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| `traefik.backend.loadbalancer.sticky=true` | enable backend sticky sessions (DEPRECATED) |
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| `traefik.frontend.rule=Host:test.traefik.io` | override the default frontend rule (Default: `Host:{containerName}.{domain}`). |
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| `traefik.frontend.passHostHeader=true` | forward client `Host` header to the backend. |
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| `traefik.frontend.priority=10` | override default frontend priority |
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@ -93,8 +93,12 @@ Annotations can be used on the Kubernetes service to override default behaviour:
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- `traefik.backend.loadbalancer.method=drr`
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Override the default `wrr` load balancer algorithm
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- `traefik.backend.loadbalancer.sticky=true`
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- `traefik.backend.loadbalancer.stickiness=true`
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Enable backend sticky sessions
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- `traefik.backend.loadbalancer.stickiness.cookieName=NAME`
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Manually set the cookie name for sticky sessions
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- `traefik.backend.loadbalancer.sticky=true`
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Enable backend sticky sessions (DEPRECATED)
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You can find here an example [ingress](https://raw.githubusercontent.com/containous/traefik/master/examples/k8s/cheese-ingress.yaml) and [replication controller](https://raw.githubusercontent.com/containous/traefik/master/examples/k8s/traefik.yaml).
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@ -153,7 +153,9 @@ Labels can be used on containers to override default behaviour:
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| `traefik.backend.maxconn.amount=10` | set a maximum number of connections to the backend. Must be used in conjunction with the below label to take effect. |
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| `traefik.backend.maxconn.extractorfunc=client.ip` | set the function to be used against the request to determine what to limit maximum connections to the backend by. Must be used in conjunction with the above label to take effect. |
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| `traefik.backend.loadbalancer.method=drr` | override the default `wrr` load balancer algorithm |
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| `traefik.backend.loadbalancer.sticky=true` | enable backend sticky sessions |
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| `traefik.backend.loadbalancer.sticky=true` | enable backend sticky sessions (DEPRECATED) |
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| `traefik.backend.loadbalancer.stickiness=true` | enable backend sticky sessions |
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| `traefik.backend.loadbalancer.stickiness.cookieName=NAME` | Manually set the cookie name for sticky sessions |
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| `traefik.backend.circuitbreaker.expression=NetworkErrorRatio() > 0.5` | create a [circuit breaker](/basics/#backends) to be used against the backend |
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| `traefik.backend.healthcheck.path=/health` | set the Traefik health check path [default: no health checks] |
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| `traefik.backend.healthcheck.interval=5s` | sets a custom health check interval in Go-parseable (`time.ParseDuration`) format [default: 30s] |
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@ -115,12 +115,17 @@ secretKey = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
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Labels can be used on task containers to override default behaviour:
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| Label | Description |
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|----------------------------------------------|------------------------------------------------------------------------------------------|
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| `traefik.protocol=https` | override the default `http` protocol |
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| `traefik.weight=10` | assign this weight to the container |
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| `traefik.enable=false` | disable this container in Træfik |
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| `traefik.frontend.rule=Host:test.traefik.io` | override the default frontend rule (Default: `Host:{containerName}.{domain}`). |
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| `traefik.frontend.passHostHeader=true` | forward client `Host` header to the backend. |
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| `traefik.frontend.priority=10` | override default frontend priority |
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| `traefik.frontend.entryPoints=http,https` | assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`. |
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|-----------------------------------------------------------------------|------------------------------------------------------------------------------------------|
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| `traefik.protocol=https` | Override the default `http` protocol |
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| `traefik.weight=10` | Assign this weight to the container |
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| `traefik.enable=false` | Disable this container in Træfik |
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| `traefik.frontend.rule=Host:test.traefik.io` | Override the default frontend rule (Default: `Host:{containerName}.{domain}`). |
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| `traefik.frontend.passHostHeader=true` | Forward client `Host` header to the backend. |
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| `traefik.frontend.priority=10` | Override default frontend priority |
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| `traefik.frontend.entryPoints=http,https` | Assign this frontend to entry points `http` and `https`. Overrides `defaultEntryPoints`. |
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| `traefik.frontend.auth.basic=EXPR` | Sets basic authentication for that frontend in CSV format: `User:Hash,User:Hash`. |
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| `traefik.backend.circuitbreaker.expression=NetworkErrorRatio() > 0.5` | Create a [circuit breaker](/basics/#backends) to be used against the backend |
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| `traefik.backend.loadbalancer.method=drr` | Override the default `wrr` load balancer algorithm |
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| `traefik.backend.loadbalancer.stickiness=true` | Enable backend sticky sessions |
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| `traefik.backend.loadbalancer.stickiness.cookieName=NAME` | Manually set the cookie name for sticky sessions |
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| `traefik.backend.loadbalancer.sticky=true` | Enable backend sticky sessions (DEPRECATED) |
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@ -126,7 +126,7 @@ docker-machine ssh manager "docker service create \
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```
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!!! note
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We set `whoami1` to use sticky sessions (`--label traefik.backend.loadbalancer.sticky=true`).
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We set `whoami1` to use sticky sessions (`--label traefik.backend.loadbalancer.stickiness=true`).
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We'll demonstrate that later.
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!!! note
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