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telegraf/plugins/inputs/exec/README.md

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Exec Input Plugin

The exec input plugin can execute arbitrary commands which output:

Example 1 - JSON

Configuration

In this example a script called /tmp/test.sh and a script called /tmp/test2.sh are configured for [[inputs.exec]] in JSON format.

# Read flattened metrics from one or more commands that output JSON to stdout
[[inputs.exec]]
  # Shell/commands array
  commands = ["/tmp/test.sh", "/tmp/test2.sh"]

  # Data format to consume. This can be "json", "influx" or "graphite" (line-protocol)
  # NOTE json only reads numerical measurements, strings and booleans are ignored.
  data_format = "json"

  # measurement name suffix (for separating different commands)
  name_suffix = "_mycollector"

  ## Below configuration will be used for data_format = "graphite", can be ignored for other data_format
  ## If matching multiple measurement files, this string will be used to join the matched values.
  #separator = "."

  ## Each template line requires a template pattern.  It can have an optional
  ## filter before the template and separated by spaces.  It can also have optional extra
  ## tags following the template.  Multiple tags should be separated by commas and no spaces
  ## similar to the line protocol format.  The can be only one default template.
  ## Templates support below format:
  ## 1. filter + template
  ## 2. filter + template + extra tag
  ## 3. filter + template with field key
  ## 4. default template
  #templates = [
  #  "*.app env.service.resource.measurement",
  #  "stats.* .host.measurement* region=us-west,agent=sensu",
  #  "stats2.* .host.measurement.field",
  #  "measurement*"
  #]

Other options for modifying the measurement names are:

name_prefix = "prefix_"

Let's say that we have the above configuration, and mycollector outputs the following JSON:

{
    "a": 0.5,
    "b": {
        "c": 0.1,
        "d": 5
    }
}

The collected metrics will be stored as fields under the measurement "exec_mycollector":

exec_mycollector a=0.5,b_c=0.1,b_d=5 1452815002357578567

If using JSON, only numeric values are parsed and turned into floats. Booleans and strings will be ignored.

Example 2 - Influx Line-Protocol

In this example an application called /usr/bin/line_protocol_collector and a script called /tmp/test2.sh are configured for [[inputs.exec]] in influx line-protocol format.

Configuration

[[inputs.exec]]
  # Shell/commands array
  # compatible with old version
  # we can still use the old command configuration
  # command = "/usr/bin/line_protocol_collector"
  commands = ["/usr/bin/line_protocol_collector","/tmp/test2.sh"]

  # Data format to consume. This can be "json" or "influx" (line-protocol)
  # NOTE json only reads numerical measurements, strings and booleans are ignored.
  data_format = "influx"

The line_protocol_collector application outputs the following line protocol:

cpu,cpu=cpu0,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
cpu,cpu=cpu1,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
cpu,cpu=cpu2,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
cpu,cpu=cpu3,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
cpu,cpu=cpu4,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
cpu,cpu=cpu5,host=foo,datacenter=us-east usage_idle=99,usage_busy=1
cpu,cpu=cpu6,host=foo,datacenter=us-east usage_idle=99,usage_busy=1

You will get data in InfluxDB exactly as it is defined above, tags are cpu=cpuN, host=foo, and datacenter=us-east with fields usage_idle and usage_busy. They will receive a timestamp at collection time. Each line must end in \n, just as the Influx line protocol does.

Example 3 - Graphite

We can also change the data_format to "graphite" to use the metrics collecting scripts such as (compatible with graphite):

In this example a script called /tmp/test.sh and a script called /tmp/test2.sh are configured for inputs.exec in graphite format.

Configuration

# Read flattened metrics from one or more commands that output JSON to stdout
[[inputs.exec]]
  # Shell/commands array
  commands = ["/tmp/test.sh","/tmp/test2.sh"]

  # Data format to consume. This can be "json", "influx" or "graphite" (line-protocol)
  # NOTE json only reads numerical measurements, strings and booleans are ignored.
  data_format = "graphite"

  # measurement name suffix (for separating different commands)
  name_suffix = "_mycollector"

  ## Below configuration will be used for data_format = "graphite", can be ignored for other data_format
  ## If matching multiple measurement files, this string will be used to join the matched values.
  separator = "."

  ## Each template line requires a template pattern.  It can have an optional
  ## filter before the template and separated by spaces.  It can also have optional extra
  ## tags following the template.  Multiple tags should be separated by commas and no spaces
  ## similar to the line protocol format.  The can be only one default template.
  ## Templates support below format:
  ## 1. filter + template
  ## 2. filter + template + extra tag
  ## 3. filter + template with field key
  ## 4. default template
  templates = [
    "*.app env.service.resource.measurement",
    "stats.* .host.measurement* region=us-west,agent=sensu",
    "stats2.* .host.measurement.field",
    "measurement*"
  ]

Graphite messages are in this format:

metric_path value timestamp\n

metric_path is the metric namespace that you want to populate.

value is the value that you want to assign to the metric at this time.

timestamp is the unix epoch time.

And test.sh/test2.sh will output:

sensu.metric.net.server0.eth0.rx_packets 461295119435 1444234982
sensu.metric.net.server0.eth0.tx_bytes 1093086493388480 1444234982
sensu.metric.net.server0.eth0.rx_bytes 1015633926034834 1444234982
sensu.metric.net.server0.eth0.tx_errors 0 1444234982
sensu.metric.net.server0.eth0.rx_errors 0 1444234982
sensu.metric.net.server0.eth0.tx_dropped 0 1444234982
sensu.metric.net.server0.eth0.rx_dropped 0 1444234982

The templates configuration will be used to parse the graphite metrics to support influxdb/opentsdb tagging store engines.

More detail information about templates, please refer to [The graphite Input] (https://github.com/influxdata/influxdb/blob/master/services/graphite/README.md)