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Provider documentation fixes

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Brendan Le Glaunec 2021-02-11 19:04:03 +01:00 • committed by GitHub
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docs/content/providers/docker.md
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@ -11,23 +11,24 @@ Traefik works with both [Docker (standalone) Engine](https://docs.docker.com/eng
and [Docker Swarm Mode](https://docs.docker.com/engine/swarm/).
!!! tip "The Quick Start Uses Docker"
If you haven't already, maybe you'd like to go through the [quick start](../getting-started/quick-start.md) that uses the docker provider!
If you have not already read it, maybe you would like to go through the [quick start guide](../getting-started/quick-start.md) that uses the Docker provider.
## Configuration Examples
??? example "Configuring Docker & Deploying / Exposing Services"
Enabling the docker provider
```toml tab="File (TOML)"
[providers.docker]
```
```yaml tab="File (YAML)"
providers:
docker: {}
```
```bash tab="CLI"
--providers.docker=true
```
@ -55,7 +56,7 @@ and [Docker Swarm Mode](https://docs.docker.com/engine/swarm/).
endpoint = "tcp://127.0.0.1:2377"
swarmMode = true
```
```yaml tab="File (YAML)"
providers:
docker:
@ -65,7 +66,7 @@ and [Docker Swarm Mode](https://docs.docker.com/engine/swarm/).
endpoint: "tcp://127.0.0.1:2377"
swarmMode: true
```
```bash tab="CLI"
# swarm classic (1.12-)
# --providers.docker.endpoint=tcp://127.0.0.1:2375
@ -102,17 +103,18 @@ When using Docker Compose, labels are specified by the directive
["services" objects](https://docs.docker.com/compose/compose-file/compose-file-v3/#service-configuration-reference).
!!! tip "Not Only Docker"
Please note that any tool like Nomad, Terraform, Ansible, etc.
that is able to define a Docker container with labels can work
with Traefik & the Docker provider.
with Traefik and the Docker provider.
### Port Detection
Traefik retrieves the private IP and port of containers from the Docker API.
Ports detection works as follows:
Port detection works as follows:
- If a container [exposes](https://docs.docker.com/engine/reference/builder/#expose) only one port,
- If a container [exposes](https://docs.docker.com/engine/reference/builder/#expose) a single port,
then Traefik uses this port for private communication.
- If a container [exposes](https://docs.docker.com/engine/reference/builder/#expose) multiple ports,
or does not expose any port, then you must manually specify which port Traefik should use for communication
@ -126,12 +128,11 @@ the IP address of the host is resolved as follows:
<!-- TODO: verify and document the swarm mode case with container.Node.IPAddress coming from the API -->
- try a lookup of `host.docker.internal`
- otherwise fall back to `127.0.0.1`
- if the lookup was unsuccessful, fall back to `127.0.0.1`
On Linux, (and until [github.com/moby/moby/pull/40007](https://github.com/moby/moby/pull/40007) is included in a release),
for `host.docker.internal` to be defined, it should be provided as an `extra_host` to the Traefik container,
using the `--add-host` flag. For example, to set it to the IP address of the bridge interface (docker0 by default):
`--add-host=host.docker.internal:172.17.0.1`
On Linux, for versions of Docker older than 20.10.0, for `host.docker.internal` to be defined, it should be provided
as an `extra_host` to the Traefik container, using the `--add-host` flag. For example, to set it to the IP address of
the bridge interface (`docker0` by default): `--add-host=host.docker.internal:172.17.0.1`
### Docker API Access
@ -145,9 +146,10 @@ You can specify which Docker API Endpoint to use with the directive [`endpoint`]
If Traefik is attacked, then the attacker might get access to the underlying host.
{: #security-note }
As explained in the Docker documentation: ([Docker Daemon Attack Surface page](https://docs.docker.com/engine/security/#docker-daemon-attack-surface)):
As explained in the [Docker Daemon Attack Surface documentation](https://docs.docker.com/engine/security/#docker-daemon-attack-surface):
!!! quote
[...] only **trusted** users should be allowed to control your Docker daemon [...]
??? success "Solutions"
@ -165,6 +167,7 @@ You can specify which Docker API Endpoint to use with the directive [`endpoint`]
- SSH public key authentication (SSH is supported with Docker > 18.09)
??? info "More Resources and Examples"
- ["Paranoid about mounting /var/run/docker.sock?"](https://medium.com/@containeroo/traefik-2-0-paranoid-about-mounting-var-run-docker-sock-22da9cb3e78c)
- [Traefik and Docker: A Discussion with Docker Captain, Bret Fisher](https://blog.traefik.io/traefik-and-docker-a-discussion-with-docker-captain-bret-fisher-7f0b9a54ff88)
- [KubeCon EU 2018 Keynote, Running with Scissors, from Liz Rice](https://www.youtube.com/watch?v=ltrV-Qmh3oY)
@ -194,15 +197,15 @@ This behavior is only enabled for docker-compose version 3+ ([Compose file refer
Docker Swarm does not provide any [port detection](#port-detection) information to Traefik.
Therefore you **must** specify the port to use for communication by using the label `traefik.http.services.<service_name>.loadbalancer.server.port`
Therefore, you **must** specify the port to use for communication by using the label `traefik.http.services.<service_name>.loadbalancer.server.port`
(Check the reference for this label in the [routing section for Docker](../routing/providers/docker.md#port)).
### Docker API Access
Docker Swarm Mode follows the same rules as Docker [API Access](#docker-api-access).
As the Swarm API is only exposed on the [manager nodes](https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/#manager-nodes), you should schedule Traefik on the Swarm manager nodes by default,
by deploying Traefik with a constraint on the node's "role":
Since the Swarm API is only exposed on the [manager nodes](https://docs.docker.com/engine/swarm/how-swarm-mode-works/nodes/#manager-nodes),
these are the nodes that Traefik should be scheduled on by deploying Traefik with a constraint on the node "role":
```shell tab="With Docker CLI"
docker service create \
@ -223,13 +226,13 @@ services:
```
!!! tip "Scheduling Traefik on Worker Nodes"
Following the guidelines given in the previous section ["Docker API Access"](#docker-api-access),
if you expose the Docker API through TCP, then Traefik can be scheduled on any node if the TCP
socket is reachable.
Please consider the security implications by reading the [Security Note](#security-note).
A good example can be found on [Bret Fisher's repository](https://github.com/BretFisher/dogvscat/blob/master/stack-proxy-global.yml#L124).
## Provider Configuration
@ -238,21 +241,6 @@ services:
_Required, Default="unix:///var/run/docker.sock"_
```toml tab="File (TOML)"
[providers.docker]
endpoint = "unix:///var/run/docker.sock"
```
```yaml tab="File (YAML)"
providers:
docker:
endpoint: "unix:///var/run/docker.sock"
```
```bash tab="CLI"
--providers.docker.endpoint=unix:///var/run/docker.sock
```
See the sections [Docker API Access](#docker-api-access) and [Docker Swarm API Access](#docker-api-access_1) for more information.
??? example "Using the docker.sock"
@ -278,14 +266,14 @@ See the sections [Docker API Access](#docker-api-access) and [Docker Swarm API A
endpoint = "unix:///var/run/docker.sock"
# ...
```
```yaml tab="File (YAML)"
providers:
docker:
endpoint: "unix:///var/run/docker.sock"
# ...
```
```bash tab="CLI"
--providers.docker.endpoint=unix:///var/run/docker.sock
# ...
@ -302,23 +290,66 @@ See the sections [Docker API Access](#docker-api-access) and [Docker Swarm API A
endpoint = "ssh://traefik@192.168.2.5:2022"
# ...
```
```yaml tab="File (YAML)"
providers:
docker:
endpoint: "ssh://traefik@192.168.2.5:2022"
# ...
```
```bash tab="CLI"
--providers.docker.endpoint=ssh://traefik@192.168.2.5:2022
# ...
```
```toml tab="File (TOML)"
[providers.docker]
endpoint = "unix:///var/run/docker.sock"
```
```yaml tab="File (YAML)"
providers:
docker:
endpoint: "unix:///var/run/docker.sock"
```
```bash tab="CLI"
--providers.docker.endpoint=unix:///var/run/docker.sock
```
### `useBindPortIP`
_Optional, Default=false_
Traefik routes requests to the IP/port of the matching container.
When setting `useBindPortIP=true`, you tell Traefik to use the IP/Port attached to the container's _binding_ instead of its inner network IP/Port.
When used in conjunction with the `traefik.http.services.<name>.loadbalancer.server.port` label (that tells Traefik to route requests to a specific port),
Traefik tries to find a binding on port `traefik.http.services.<name>.loadbalancer.server.port`.
If it cannot find such a binding, Traefik falls back on the internal network IP of the container,
but still uses the `traefik.http.services.<name>.loadbalancer.server.port` that is set in the label.
??? example "Examples of `usebindportip` in different situations."
| port label | Container's binding | Routes to |
|--------------------|----------------------------------------------------|----------------|
| - | - | IntIP:IntPort |
| - | ExtPort:IntPort | IntIP:IntPort |
| - | ExtIp:ExtPort:IntPort | ExtIp:ExtPort |
| LblPort | - | IntIp:LblPort |
| LblPort | ExtIp:ExtPort:LblPort | ExtIp:ExtPort |
| LblPort | ExtIp:ExtPort:OtherPort | IntIp:LblPort |
| LblPort | ExtIp1:ExtPort1:IntPort1 & ExtIp2:LblPort:IntPort2 | ExtIp2:LblPort |
!!! info ""
In the above table:
- `ExtIp` stands for "external IP found in the binding"
- `IntIp` stands for "internal network container's IP",
- `ExtPort` stands for "external Port found in the binding"
- `IntPort` stands for "internal network container's port."
```toml tab="File (TOML)"
[providers.docker]
useBindPortIP = true
@ -337,38 +368,15 @@ providers:
# ...
```
Traefik routes requests to the IP/Port of the matching container.
When setting `useBindPortIP=true`, you tell Traefik to use the IP/Port attached to the container's _binding_ instead of its inner network IP/Port.
When used in conjunction with the `traefik.http.services.<name>.loadbalancer.server.port` label (that tells Traefik to route requests to a specific port),
Traefik tries to find a binding on port `traefik.http.services.<name>.loadbalancer.server.port`.
If it can't find such a binding, Traefik falls back on the internal network IP of the container,
but still uses the `traefik.http.services.<name>.loadbalancer.server.port` that is set in the label.
??? example "Examples of `usebindportip` in different situations."
| port label | Container's binding | Routes to |
|--------------------|----------------------------------------------------|----------------|
| - | - | IntIP:IntPort |
| - | ExtPort:IntPort | IntIP:IntPort |
| - | ExtIp:ExtPort:IntPort | ExtIp:ExtPort |
| LblPort | - | IntIp:LblPort |
| LblPort | ExtIp:ExtPort:LblPort | ExtIp:ExtPort |
| LblPort | ExtIp:ExtPort:OtherPort | IntIp:LblPort |
| LblPort | ExtIp1:ExtPort1:IntPort1 & ExtIp2:LblPort:IntPort2 | ExtIp2:LblPort |
!!! info ""
In the above table:
- `ExtIp` stands for "external IP found in the binding"
- `IntIp` stands for "internal network container's IP",
- `ExtPort` stands for "external Port found in the binding"
- `IntPort` stands for "internal network container's port."
### `exposedByDefault`
_Optional, Default=true_
Expose containers by default through Traefik.
If set to `false`, containers that do not have a `traefik.enable=true` label are ignored from the resulting routing configuration.
For additional information, refer to [Restrict the Scope of Service Discovery](./overview.md#restrict-the-scope-of-service-discovery).
```toml tab="File (TOML)"
[providers.docker]
exposedByDefault = false
@ -387,14 +395,13 @@ providers:
# ...
```
Expose containers by default through Traefik.
If set to false, containers that don't have a `traefik.enable=true` label will be ignored from the resulting routing configuration.
See also [Restrict the Scope of Service Discovery](./overview.md#restrict-the-scope-of-service-discovery).
### `network`
_Optional, Default=empty_
_Optional, Default=""_
Defines a default docker network to use for connections to all containers.
This option can be overridden on a per-container basis with the `traefik.docker.network` label.
```toml tab="File (TOML)"
[providers.docker]
@ -414,14 +421,17 @@ providers:
# ...
```
Defines a default docker network to use for connections to all containers.
This option can be overridden on a container basis with the `traefik.docker.network` label.
### `defaultRule`
_Optional, Default=```Host(`{{ normalize .Name }}`)```_
The `defaultRule` option defines what routing rule to apply to a container if no rule is defined by a label.
It must be a valid [Go template](https://golang.org/pkg/text/template/), and can use
[sprig template functions](http://masterminds.github.io/sprig/).
The container service name can be accessed with the `Name` identifier,
and the template has access to all the labels defined on this container.
```toml tab="File (TOML)"
[providers.docker]
defaultRule = "Host(`{{ .Name }}.{{ index .Labels \"customLabel\"}}`)"
@ -440,16 +450,12 @@ providers:
# ...
```
For a given container if no routing rule was defined by a label, it is defined by this defaultRule instead.
It must be a valid [Go template](https://golang.org/pkg/text/template/),
augmented with the [sprig template functions](http://masterminds.github.io/sprig/).
The container service name can be accessed as the `Name` identifier,
and the template has access to all the labels defined on this container.
### `swarmMode`
_Optional, Default=false_
Enables the Swarm Mode (instead of standalone Docker).
```toml tab="File (TOML)"
[providers.docker]
swarmMode = true
@ -468,12 +474,12 @@ providers:
# ...
```
Activates the Swarm Mode (instead of standalone Docker).
### `swarmModeRefreshSeconds`
_Optional, Default=15_
Defines the polling interval (in seconds) for Swarm Mode.
```toml tab="File (TOML)"
[providers.docker]
swarmModeRefreshSeconds = 30
@ -492,12 +498,12 @@ providers:
# ...
```
Defines the polling interval (in seconds) in Swarm Mode.
### `httpClientTimeout`
_Optional, Default=0_
Defines the client timeout (in seconds) for HTTP connections. If its value is `0`, no timeout is set.
```toml tab="File (TOML)"
[providers.docker]
httpClientTimeout = 300
@ -516,12 +522,12 @@ providers:
# ...
```
Defines the client timeout (in seconds) for HTTP connections. If zero, no timeout is set.
### `watch`
_Optional, Default=true_
Watch Docker Swarm events.
```toml tab="File (TOML)"
[providers.docker]
watch = false
@ -540,12 +546,51 @@ providers:
# ...
```
Watch Docker Swarm events.
### `constraints`
_Optional, Default=""_
The `constraints` option can be set to an expression that Traefik matches against the container tags to determine whether
to create any route for that container. If none of the container tags match the expression, no route for that container is
created. If the expression is empty, all detected containers are included.
The expression syntax is based on the ```Tag(`tag`)```, and ```TagRegex(`tag`)``` 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 = "LabelRegex(`a.label.name`, `a.+`)"
```
For additional information, refer to [Restrict the Scope of Service Discovery](./overview.md#restrict-the-scope-of-service-discovery).
```toml tab="File (TOML)"
[providers.docker]
constraints = "Label(`a.label.name`,`foo`)"
@ -564,53 +609,13 @@ providers:
# ...
```
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 `LabelRegex("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 = "LabelRegex(`a.label.name`, `a.+`)"
```
See also [Restrict the Scope of Service Discovery](./overview.md#restrict-the-scope-of-service-discovery).
### `tls`
_Optional_
#### `tls.ca`
Certificate Authority used for the secured connection to Docker.
Certificate Authority used for the secure connection to Docker.
```toml tab="File (TOML)"
[providers.docker.tls]
@ -630,12 +635,15 @@ providers:
#### `tls.caOptional`
Policy followed for the secured connection with TLS Client Authentication to Docker.
Requires `tls.ca` to be defined.
The value of `tls.caOptional` defines which policy should be used for the secure connection with TLS Client Authentication to Docker.
- `true`: VerifyClientCertIfGiven
- `false`: RequireAndVerifyClientCert
- if `tls.ca` is undefined NoClientCert
!!! warning ""
If `tls.ca` is undefined, this option will be ignored, and no client certificate will be requested during the handshake. Any provided certificate will thus never be verified.
When this option is set to `true`, a client certificate is requested during the handshake but is not required. If a certificate is sent, it is required to be valid.
When this option is set to `false`, a client certificate is requested during the handshake, and at least one valid certificate should be sent by the client.
```toml tab="File (TOML)"
[providers.docker.tls]
@ -655,7 +663,7 @@ providers:
#### `tls.cert`
Public certificate used for the secured connection to Docker.
Public certificate used for the secure connection to Docker.
```toml tab="File (TOML)"
[providers.docker.tls]
@ -678,7 +686,7 @@ providers:
#### `tls.key`
Private certificate used for the secured connection to Docker.
Private certificate used for the secure connection to Docker.
```toml tab="File (TOML)"
[providers.docker.tls]
@ -701,7 +709,7 @@ providers:
#### `tls.insecureSkipVerify`
If `insecureSkipVerify` is `true`, TLS for the connection to Docker accepts any certificate presented by the server and any host name in that certificate.
If `insecureSkipVerify` is `true`, the TLS connection to Docker accepts any certificate presented by the server regardless of the hostnames it covers.
```toml tab="File (TOML)"
[providers.docker.tls]