discovery.docker
discovery.docker
discovers Docker Engine containers and exposes them as targets.
Usage
discovery.docker "<LABEL>" {
host = "<DOCKER_ENGINE_HOST>"
}
Arguments
You can use the following arguments with discovery.docker
:
At most, one of the following can be provided:
authorization
blockbasic_auth
blockbearer_token_file
argumentbearer_token
argumentoauth2
block
no_proxy
can contain IPs, CIDR notations, and domain names. IP and domain names can contain port numbers.
proxy_url
must be configured if no_proxy
is configured.
proxy_from_environment
uses the environment variables HTTP_PROXY, HTTPS_PROXY, and NO_PROXY (or the lowercase versions thereof).
Requests use the proxy from the environment variable matching their scheme, unless excluded by NO_PROXY.
proxy_url
and no_proxy
must not be configured if proxy_from_environment
is configured.
proxy_connect_header
should only be configured if proxy_url
or proxy_from_environment
are configured.
Blocks
You can use the following blocks with discovery.docker
:
The >
symbol indicates deeper levels of nesting.
For example, oauth2 > tls_config
refers to a tls_config
block defined inside an oauth2
block.
authorization
The authorization
block configures generic authorization to the endpoint.
credential
and credentials_file
are mutually exclusive, and only one can be provided inside an authorization
block.
basic_auth
The basic_auth
block configures basic authentication to the endpoint.
password
and password_file
are mutually exclusive, and only one can be provided inside a basic_auth
block.
filter
The filter
block configures a filter to pass to the Docker Engine to limit the number of containers returned.
You can specify the filter
block multiple times to provide more than one filter.
Refer to List containers from the Docker Engine API documentation for the list of supported filters and their meaning.
oauth2
The oauth
block configures OAuth 2.0 authentication to the endpoint.
client_secret
and client_secret_file
are mutually exclusive, and only one can be provided inside an oauth2
block.
The oauth2
block may also contain a separate tls_config
sub-block.
no_proxy
can contain IPs, CIDR notations, and domain names. IP and domain names can contain port numbers.
proxy_url
must be configured if no_proxy
is configured.
proxy_from_environment
uses the environment variables HTTP_PROXY, HTTPS_PROXY, and NO_PROXY (or the lowercase versions thereof).
Requests use the proxy from the environment variable matching their scheme, unless excluded by NO_PROXY.
proxy_url
and no_proxy
must not be configured if proxy_from_environment
is configured.
proxy_connect_header
should only be configured if proxy_url
or proxy_from_environment
are configured.
tls_config
The tls_config
block configures TLS settings for connecting to the endpoint.
The following pairs of arguments are mutually exclusive and can’t both be set simultaneously:
ca_pem
andca_file
cert_pem
andcert_file
key_pem
andkey_file
When configuring client authentication, both the client certificate (using cert_pem
or cert_file
) and the client key (using key_pem
or key_file
) must be provided.
When min_version
isn’t provided, the minimum acceptable TLS version is inherited from Go’s default minimum version, TLS 1.2.
If min_version
is provided, it must be set to one of the following strings:
"TLS10"
(TLS 1.0)"TLS11"
(TLS 1.1)"TLS12"
(TLS 1.2)"TLS13"
(TLS 1.3)
Exported fields
The following fields are exported and can be referenced by other components:
Each target includes the following labels:
__meta_docker_container_id
: ID of the container.__meta_docker_container_label_<labelname>
: Each label from the container.__meta_docker_container_name
: Name of the container.__meta_docker_container_network_mode
: Network mode of the container.__meta_docker_network_id
: ID of the Docker network the container is in.__meta_docker_network_ingress
: Set totrue
if the Docker network is an ingress network.__meta_docker_network_internal
: Set totrue
if the Docker network is an internal network.__meta_docker_network_ip
: The IP of the container in the network.__meta_docker_network_label_<labelname>
: Each label from the network the container is in.__meta_docker_network_name
: Name of the Docker network the container is in.__meta_docker_network_scope
: The scope of the network the container is in.__meta_docker_port_private
: The private port on the container.__meta_docker_port_public_ip
: The public IP of the container, if a port mapping exists.__meta_docker_port_public
: The publicly exposed port from the container, if a port mapping exists.
Each discovered container maps to one target per unique combination of networks and port mappings used by the container.
Component health
discovery.docker
is only reported as unhealthy when given an invalid configuration.
In those cases, exported fields retain their last healthy values.
Debug information
discovery.docker
doesn’t expose any component-specific debug information.
Debug metrics
discovery.docker
doesn’t expose any component-specific debug metrics.
Examples
Linux or macOS hosts
This example discovers Docker containers when the host machine is macOS or Linux:
Replace the following:
<PROMETHEUS_REMOTE_WRITE_URL>
: The URL of the Prometheus remote_write-compatible server to send metrics to.<USERNAME>
: The username to use for authentication to theremote_write
API.<PASSWORD>
: The password to use for authentication to theremote_write
API.
Windows hosts
This example discovers Docker containers when the host machine is Windows:
Note
This example requires the “Expose daemon on tcp://localhost:2375 without TLS” setting to be enabled in the Docker Engine settings.
Replace the following:
<PROMETHEUS_REMOTE_WRITE_URL>
: The URL of the Prometheus remote_write-compatible server to send metrics to.<USERNAME>
: The username to use for authentication to theremote_write
API.<PASSWORD>
: The password to use for authentication to theremote_write
API.
Compatible components
discovery.docker
has exports that can be consumed by the following components:
- Components that consume Targets
Note
Connecting some components may not be sensible or components may require further configuration to make the connection work correctly. Refer to the linked documentation for more details.