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New constraints management.

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Co-authored-by: Mathieu Lonjaret <mathieu.lonjaret@gmail.com>
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Ludovic Fernandez 2019-06-21 09:24:04 +02:00 • committed by Traefiker Bot
parent e9792b446f
commit fe68e9e243
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52
docs/content/providers/docker.md
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@ -37,7 +37,7 @@ Attach labels to your containers and let Traefik do the rest!
Enabling the docker provider (Swarm Mode)
```toml
[docker]
[providers.docker]
# swarm classic (1.12-)
# endpoint = "tcp://127.0.0.1:2375"
# docker swarm mode (1.12+)
@ -193,8 +193,8 @@ The container service name can be accessed as the `Name` identifier,
and the template has access to all the labels defined on this container.
```toml tab="File"
[docker]
defaultRule = ""
[providers.docker]
defaultRule = "Host(`{{ .Name }}.{{ index .Labels \"customLabel\"}}`)"
# ...
```
@ -215,6 +215,48 @@ _Optional, Default=15_
Defines the polling interval (in seconds) in Swarm Mode.
### `constraints`
_Optional, Default=""_
Constraints is an expression that Traefik matches against the container's labels to determine whether to create any route for that container.
That is to say, if none of the container's labels match the expression, no route for the container is created.
If the expression is empty, all detected containers are included.
The expression syntax is based on the `Label("key", "value")`, and `LabelRegexp("key", "value")` functions, as well as the usual boolean logic, as shown in examples below.
??? example "Constraints Expression Examples"
```toml
# Includes only containers having a label with key `a.label.name` and value `foo`
constraints = "Label(`a.label.name`, `foo`)"
```
```toml
# Excludes containers having any label with key `a.label.name` and value `foo`
constraints = "!Label(`a.label.name`, `value`)"
```
```toml
# With logical AND.
constraints = "Label(`a.label.name`, `valueA`) && Label(`another.label.name`, `valueB`)"
```
```toml
# With logical OR.
constraints = "Label(`a.label.name`, `valueA`) || Label(`another.label.name`, `valueB`)"
```
```toml
# With logical AND and OR, with precedence set by parentheses.
constraints = "Label(`a.label.name`, `valueA`) && (Label(`another.label.name`, `valueB`) || Label(`yet.another.label.name`, `valueC`))"
```
```toml
# Includes only containers having a label with key `a.label.name` and a value matching the `a.+` regular expression.
constraints = "LabelRegexp(`a.label.name`, `a.+`)"
```
## Routing Configuration Options
### General
@ -286,10 +328,6 @@ You can tell Traefik to consider (or not) the container by setting `traefik.enab
This option overrides the value of `exposedByDefault`.
#### `traefik.tags`
Sets the tags for [constraints filtering](./overview.md#constraints-configuration).
#### `traefik.docker.network`
Overrides the default docker network to use for connections to the container.