influxdb_listener

InfluxDB Listener Input Plugin

InfluxDB Listener is a service input plugin that listens for requests sent according to the InfluxDB HTTP API. The intent of the plugin is to allow Telegraf to serve as a proxy/router for the /write endpoint of the InfluxDB HTTP API.

Note: This plugin was previously known as http_listener. If you wish to send general metrics via HTTP it is recommended to use the http_listener_v2 instead.

The /write endpoint supports the precision query parameter and can be set to one of ns, u, ms, s, m, h. All other parameters are ignored and defer to the output plugins configuration.

When chaining Telegraf instances using this plugin, CREATE DATABASE requests receive a 200 OK response with message body {"results":[]} but they are not relayed. The output configuration of the Telegraf instance which ultimately submits data to InfluxDB determines the destination database.

Service Input

This plugin is a service input. Normal plugins gather metrics determined by the interval setting. Service plugins start a service to listens and waits for metrics or events to occur. Service plugins have two key differences from normal plugins:

1. The global or plugin specific interval setting may not apply
2. The CLI options of --test, --test-wait, and --once may not produce output for this plugin

Global configuration options

In addition to the plugin-specific configuration settings, plugins support additional global and plugin configuration settings. These settings are used to modify metrics, tags, and field or create aliases and configure ordering, etc. See the CONFIGURATION.md for more details.

Configuration

# Accept metrics over InfluxDB 1.x HTTP API
[[inputs.influxdb_listener]]
  ## Address and port to host HTTP listener on
  service_address = ":8186"

  ## maximum duration before timing out read of the request
  read_timeout = "10s"
  ## maximum duration before timing out write of the response
  write_timeout = "10s"

  ## Maximum allowed HTTP request body size in bytes.
  ## 0 means to use the default of 32MiB.
  max_body_size = 0

  ## Maximum line size allowed to be sent in bytes.
  ##   deprecated in 1.14; parser now handles lines of unlimited length and option is ignored
  # max_line_size = 0

  ## Set one or more allowed client CA certificate file names to
  ## enable mutually authenticated TLS connections
  tls_allowed_cacerts = ["/etc/telegraf/clientca.pem"]

  ## Add service certificate and key
  tls_cert = "/etc/telegraf/cert.pem"
  tls_key = "/etc/telegraf/key.pem"

  ## Optional tag name used to store the database name.
  ## If the write has a database in the query string then it will be kept in this tag name.
  ## This tag can be used in downstream outputs.
  ## The default value of nothing means it will be off and the database will not be recorded.
  ## If you have a tag that is the same as the one specified below, and supply a database,
  ## the tag will be overwritten with the database supplied.
  # database_tag = ""

  ## If set the retention policy specified in the write query will be added as
  ## the value of this tag name.
  # retention_policy_tag = ""

  ## Optional username and password to accept for HTTP basic authentication
  ## or authentication token.
  ## You probably want to make sure you have TLS configured above for this.
  ## Use these options for the authentication token in the form
  ##   Authentication: Token <basic_username>:<basic_password>
  # basic_username = "foobar"
  # basic_password = "barfoo"

  ## Optional JWT token authentication for HTTP requests
  ## Please see the documentation at
  ##   https://docs.influxdata.com/influxdb/v1.8/administration/authentication_and_authorization/#authenticate-using-jwt-tokens
  ## for further details.
  ## Please note: Token authentication and basic authentication cannot be used
  ##              at the same time.
  # token_shared_secret = ""
  # token_username = ""

  ## Influx line protocol parser
  ## 'internal' is the default. 'upstream' is a newer parser that is faster
  ## and more memory efficient.
  # parser_type = "internal"

Metrics

Metrics are created from InfluxDB Line Protocol in the request body.

Troubleshooting

Example Query:

curl -i -XPOST 'http://localhost:8186/write' --data-binary 'cpu_load_short,host=server01,region=us-west value=0.64 1434055562000000000'

Example Output