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Reference

Components

remote

remote.kubernetes.configmap

General availability (GA) Open source

`remote.kubernetes.configmap`

remote.kubernetes.configmap reads a ConfigMap from the Kubernetes API server and exposes its data for other components to consume.

This can be useful anytime Alloy needs data from a ConfigMap that is not directly mounted to the Alloy Pod.

Usage

remote.kubernetes.configmap "<LABEL>" {
  namespace = "<NAMESPACE_OF_CONFIGMAP>"
  name = "<NAME_OF_CONFIGMAP>"
}

Arguments

You can use the following arguments with remote.kubernetes.configmap:

Name	Type	Description	Default	Required
`name`	`string`	Name of the Kubernetes ConfigMap		yes
`namespace`	`string`	Kubernetes namespace containing the desired ConfigMap.		yes
`poll_frequency`	`duration`	Frequency to poll the Kubernetes API.	`"1m"`	no
`poll_timeout`	`duration`	Timeout when polling the Kubernetes API.	`"15s"`	no

When this component performs a poll operation, it requests the ConfigMap data from the Kubernetes API. A poll is triggered by the following:

When the component first loads.
Every time the component’s arguments get re-evaluated.
At the frequency specified by the poll_frequency argument.

Any error while polling will mark the component as unhealthy. After a successful poll, all data is exported with the same field names as the source ConfigMap.

Blocks

You can use the following blocks with remote.kubernetes.configmap:

Block	Description	Required
`client`	Configures Kubernetes client used to find ConfigMaps.	no
`client` > `authorization`	Configure generic authorization to the Kubernetes API.	no
`client` > `basic_auth`	Configure basic authentication to the Kubernetes API.	no
`client` > `oauth2`	Configure OAuth 2.0 for authenticating to the Kubernetes API.	no
`client` > `oauth2` > `tls_config`	Configure TLS settings for connecting to the Kubernetes API.	no
`client` > `tls_config`	Configure TLS settings for connecting to the Kubernetes API.	no

The > symbol indicates deeper levels of nesting. For example, client > basic_auth refers to a basic_auth block defined inside a client block.

`client`

The client block configures the Kubernetes client used to discover ConfigMaps. If the client block isn’t provided, the default in-cluster configuration with the service account of the running Alloy Pod is used.

The following arguments are supported:

Name	Type	Description	Default	Required
`api_server`	`string`	URL of the Kubernetes API server.		no
`bearer_token_file`	`string`	File containing a bearer token to authenticate with.		no
`bearer_token`	`secret`	Bearer token to authenticate with.		no
`enable_http2`	`bool`	Whether HTTP2 is supported for requests.	`true`	no
`follow_redirects`	`bool`	Whether redirects returned by the server should be followed.	`true`	no
`http_headers`	`map(list(secret))`	Custom HTTP headers to be sent along with each request. The map key is the header name.		no
`kubeconfig_file`	`string`	Path of the `kubeconfig` file to use for connecting to Kubernetes.		no
`no_proxy`	`string`	Comma-separated list of IP addresses, CIDR notations, and domain names to exclude from proxying.		no
`proxy_connect_header`	`map(list(secret))`	Specifies headers to send to proxies during CONNECT requests.		no
`proxy_from_environment`	`bool`	Use the proxy URL indicated by environment variables.	`false`	no
`proxy_url`	`string`	HTTP proxy to send requests through.		no

At most, one of the following can be provided:

authorization block
basic_auth block
bearer_token_file argument
bearer_token argument
oauth2 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.

`authorization`

Name	Type	Description	Required
`credentials_file`	`string`	File containing the secret value.	no
`credentials`	`secret`	Secret value.	no
`type`	`string`	Authorization type, for example, “Bearer”.	no

credential and credentials_file are mutually exclusive, and only one can be provided inside an authorization block.

Warning
Using credentials_file causes the file to be read on every outgoing request. Use the local.file component with the credentials attribute instead to avoid unnecessary reads.

`basic_auth`

Name	Type	Description	Required
`password_file`	`string`	File containing the basic auth password.	no
`password`	`secret`	Basic auth password.	no
`username`	`string`	Basic auth username.	no

password and password_file are mutually exclusive, and only one can be provided inside a basic_auth block.

Warning
Using password_file causes the file to be read on every outgoing request. Use the local.file component with the password attribute instead to avoid unnecessary reads.

`oauth2`

Name	Type	Description	Default	Required
`client_id`	`string`	OAuth2 client ID.		no
`client_secret_file`	`string`	File containing the OAuth2 client secret.		no
`client_secret`	`secret`	OAuth2 client secret.		no
`endpoint_params`	`map(string)`	Optional parameters to append to the token URL.		no
`no_proxy`	`string`	Comma-separated list of IP addresses, CIDR notations, and domain names to exclude from proxying.		no
`proxy_connect_header`	`map(list(secret))`	Specifies headers to send to proxies during CONNECT requests.		no
`proxy_from_environment`	`bool`	Use the proxy URL indicated by environment variables.	`false`	no
`proxy_url`	`string`	HTTP proxy to send requests through.		no
`scopes`	`list(string)`	List of scopes to authenticate with.		no
`token_url`	`string`	URL to fetch the token from.		no

client_secret and client_secret_file are mutually exclusive, and only one can be provided inside an oauth2 block.

Warning
Using client_secret_file causes the file to be read on every outgoing request. Use the local.file component with the client_secret attribute instead to avoid unnecessary reads.

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_connect_header should only be configured if proxy_url or proxy_from_environment are configured.

`tls_config`

Name	Type	Description	Required
`ca_pem`	`string`	CA PEM-encoded text to validate the server with.	no
`ca_file`	`string`	CA certificate to validate the server with.	no
`cert_pem`	`string`	Certificate PEM-encoded text for client authentication.	no
`cert_file`	`string`	Certificate file for client authentication.	no
`insecure_skip_verify`	`bool`	Disables validation of the server certificate.	no
`key_file`	`string`	Key file for client authentication.	no
`key_pem`	`secret`	Key PEM-encoded text for client authentication.	no
`min_version`	`string`	Minimum acceptable TLS version.	no
`server_name`	`string`	ServerName extension to indicate the name of the server.	no

The following pairs of arguments are mutually exclusive and can’t both be set simultaneously:

ca_pem and ca_file
cert_pem and cert_file
key_pem and key_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:

Name	Type	Description
`data`	`map(string)`	Data from the ConfigMap obtained from Kubernetes.

The data field contains a mapping from field names to values.

Component health

Instances of remote.kubernetes.configmap report as healthy if the most recent attempt to poll the kubernetes API succeeds.

Debug information

remote.kubernetes.configmap doesn’t expose any component-specific debug information.

Debug metrics

remote.kubernetes.configmap doesn’t expose any component-specific debug metrics.

Example

This example reads a Secret and a ConfigMap from Kubernetes and uses them to supply remote-write credentials.

remote.kubernetes.secret "credentials" {
  namespace = "monitoring"
  name = "metrics-secret"
}

remote.kubernetes.configmap "endpoint" {
  namespace = "monitoring"
  name = "metrics-endpoint"
}

prometheus.remote_write "default" {
  endpoint {
    url = remote.kubernetes.configmap.endpoint.data["url"]
    basic_auth {
      username = remote.kubernetes.configmap.endpoint.data["username"]
      password = remote.kubernetes.secret.credentials.data["password"]
    }
  }
}

This example assumes that the Secret and ConfigMap have already been created, and that the appropriate field names exist in their data.

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remote.kubernetes.configmap

Usage

Arguments

Blocks

client

authorization

basic_auth

oauth2

tls_config

Exported fields

Component health

Debug information

Debug metrics

Example

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Related resources from Grafana Labs

`remote.kubernetes.configmap`

`client`

`authorization`

`basic_auth`

`oauth2`

`tls_config`