Exec

Collect output from a process running on the host

status: beta role: sidecar delivery: at-least-once acknowledgements: no egress: stream state: stateless output: log
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Configuration

Example configurations 

{
  "sources": {
    "my_source_id": {
      "type": "exec",
      "command": [
        "echo"
      ],
      "mode": "scheduled"
    }
  }
}
[sources.my_source_id]
type = "exec"
command = [ "echo" ]
mode = "scheduled"

---
sources:
  my_source_id:
    type: exec
    command:
      - echo
    mode: scheduled

{
  "sources": {
    "my_source_id": {
      "type": "exec",
      "command": [
        "echo"
      ],
      "include_stderr": true,
      "maximum_buffer_size_bytes": 1000000,
      "mode": "scheduled"
    }
  }
}
[sources.my_source_id]
type = "exec"
command = [ "echo" ]
include_stderr = true
maximum_buffer_size_bytes = 1_000_000
mode = "scheduled"

---
sources:
  my_source_id:
    type: exec
    command:
      - echo
    include_stderr: true
    maximum_buffer_size_bytes: 1000000
    mode: scheduled

command

required [string]
The command to be run, plus any arguments required.
Array string literal
Examples 
[
  "echo",
  "Hello World!"
]

decoding

optional object
Configures how events are decoded from raw bytes.

decoding.codec

optional string literal enum
The codec to use for decoding events.
Enum options
OptionDescription
bytesUses the raw bytes as-is.
gelfDecodes the raw bytes as a GELF message.
jsonDecodes the raw bytes as JSON.
native

Decodes the raw bytes as Vector’s native Protocol Buffers format.

This codec is experimental.

native_json

Decodes the raw bytes as Vector’s native JSON format.

This codec is experimental.

syslog

Decodes the raw bytes as a Syslog message.

Will decode either as the RFC 3164-style format (“old” style) or the more modern RFC 5424-style format (“new” style, includes structured data).

default: bytes

framing

optional object

Framing configuration.

Framing deals with how events are separated when encoded in a raw byte form, where each event is a “frame” that must be prefixed, or delimited, in a way that marks where an event begins and ends within the byte stream.

framing.character_delimited

required object
Options for the character delimited decoder.
Relevant when: method = "character_delimited"
framing.character_delimited.delimiter
required uint
The character that delimits byte sequences.
framing.character_delimited.max_length
optional uint

The maximum length of the byte buffer.

This length does not include the trailing delimiter.

By default, there is no maximum length enforced. If events are malformed, this can lead to additional resource usage as events continue to be buffered in memory, and can potentially lead to memory exhaustion in extreme cases.

If there is a risk of processing malformed data, such as logs with user-controlled input, consider setting the maximum length to a reasonably large value as a safety net. This will ensure that processing is not truly unbounded.

framing.method

required string literal enum
The framing method.
Enum options
OptionDescription
bytesByte frames are passed through as-is according to the underlying I/O boundaries (e.g. split between messages or stream segments).
character_delimitedByte frames which are delimited by a chosen character.
length_delimitedByte frames which are prefixed by an unsigned big-endian 32-bit integer indicating the length.
newline_delimitedByte frames which are delimited by a newline character.
octet_countingByte frames according to the octet counting format.
Examples 
"bytes"
"character_delimited"
"length_delimited"
"newline_delimited"
"octet_counting"

framing.newline_delimited

optional object
Options for the newline delimited decoder.
Relevant when: method = "newline_delimited"
framing.newline_delimited.max_length
optional uint

The maximum length of the byte buffer.

This length does not include the trailing delimiter.

By default, there is no maximum length enforced. If events are malformed, this can lead to additional resource usage as events continue to be buffered in memory, and can potentially lead to memory exhaustion in extreme cases.

If there is a risk of processing malformed data, such as logs with user-controlled input, consider setting the maximum length to a reasonably large value as a safety net. This will ensure that processing is not truly unbounded.

framing.octet_counting

optional object
Options for the octet counting decoder.
Relevant when: method = "octet_counting"
framing.octet_counting.max_length
optional uint
The maximum length of the byte buffer.

include_stderr

optional bool
Whether or not the output from stderr should be included when generating events.
default: true

maximum_buffer_size_bytes

optional uint
The maximum buffer size allowed before a log event will be generated.
default: 1e+06

mode

required string literal enum
Mode of operation for running the command.
Examples 
"scheduled"
"streaming"
Enum options string literal
OptionDescription
scheduledThe command is run on a schedule.
streamingThe command is run until it exits, potentially being restarted.

scheduled

optional object
Configuration options for scheduled commands.

scheduled.exec_interval_secs

optional uint

The interval, in seconds, between scheduled command runs.

If the command takes longer than exec_interval_secs to run, it will be killed.

default: 60

streaming

optional object
Configuration options for streaming commands.

streaming.respawn_interval_secs

optional uint
The amount of time, in seconds, that Vector will wait before rerunning a streaming command that exited.
default: 5

streaming.respawn_on_exit

optional bool
Whether or not the command should be rerun if the command exits.
default: true

working_directory

optional string literal
The directory in which to run the command.

Outputs

<component_id>

Default output stream of the component. Use this component’s ID as an input to downstream transforms and sinks.

Output Data

Logs

Line

An individual event from exec.
Fields
command required [string]
The command that was run to generate this event.
data_stream optional string literal
The data stream from which the event originated.
Examples
stdout
stderr
host required string literal
The local hostname, equivalent to the gethostname command.
Examples
my-host.local
message required string literal
The raw line, unparsed.
Examples
2019-02-13T19:48:34+00:00 [info] Started GET "/" for 127.0.0.1
pid required uint
The process ID of the command.
Examples
60085
668
source_type required string literal
The name of the source type.
Examples
exec
timestamp required timestamp
The exact time the event was ingested into Vector.
Examples
2020-10-10T17:07:36.452332Z

Telemetry

Metrics

link

command_executed_total

counter
The total number of times a command has been executed.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

command_execution_duration_seconds

histogram
The command execution duration in seconds.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

component_discarded_events_total

counter
The number of events dropped by this component.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

component_errors_total

counter
The total number of errors encountered by this component.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
error_type
The type of the error
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.
stage
The stage within the component at which the error occurred.

component_received_event_bytes_total

counter
The number of event bytes accepted by this component either from tagged origins like file and uri, or cumulatively from other origins.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
container_name optional
The name of the container from which the data originated.
file optional
The file from which the data originated.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the data originated.
peer_path optional
The pathname from which the data originated.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the data originated.
uri optional
The sanitized URI from which the data originated.

component_received_events_total

counter
The number of events accepted by this component either from tagged origins like file and uri, or cumulatively from other origins.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
container_name optional
The name of the container from which the data originated.
file optional
The file from which the data originated.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the data originated.
peer_path optional
The pathname from which the data originated.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the data originated.
uri optional
The sanitized URI from which the data originated.

component_sent_event_bytes_total

counter
The total number of event bytes emitted by this component.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
output optional
The specific output of the component.
pid optional
The process ID of the Vector instance.

component_sent_events_total

counter
The total number of events emitted by this component.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
output optional
The specific output of the component.
pid optional
The process ID of the Vector instance.

events_in_total

counter
The number of events accepted by this component either from tagged origins like file and uri, or cumulatively from other origins. This metric is deprecated and will be removed in a future version. Use component_received_events_total instead.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
container_name optional
The name of the container from which the data originated.
file optional
The file from which the data originated.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the data originated.
peer_path optional
The pathname from which the data originated.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the data originated.
uri optional
The sanitized URI from which the data originated.

events_out_total

counter
The total number of events emitted by this component. This metric is deprecated and will be removed in a future version. Use component_sent_events_total instead.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
output optional
The specific output of the component.
pid optional
The process ID of the Vector instance.

processed_bytes_total

counter
The number of bytes processed by the component.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
container_name optional
The name of the container from which the bytes originate.
file optional
The file from which the bytes originate.
host optional
The hostname of the system Vector is running on.
mode optional
The connection mode used by the component.
peer_addr optional
The IP from which the bytes originate.
peer_path optional
The pathname from which the bytes originate.
pid optional
The process ID of the Vector instance.
pod_name optional
The name of the pod from which the bytes originate.
uri optional
The sanitized URI from which the bytes originate.

processed_events_total

counter
The total number of events processed by this component. This metric is deprecated in place of using component_received_events_total and component_sent_events_total metrics.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

processing_errors_total

counter
The total number of processing errors encountered by this component. This metric is deprecated in favor of component_errors_total.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
error_type
The type of the error
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

source_lag_time_seconds

histogram
The difference between the timestamp recorded in each event and the time when it was ingested, expressed as fractional seconds.
component_id
The Vector component ID.
component_kind
The Vector component kind.
component_name
Deprecated, use component_id instead. The value is the same as component_id.
component_type
The Vector component type.
host optional
The hostname of the system Vector is running on.
pid optional
The process ID of the Vector instance.

Examples

Exec line

Given this event...
64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.060 ms
...and this configuration...
[sources.my_source_id]
type = "exec"

---
sources:
  my_source_id:
    type: exec

{
  "sources": {
    "my_source_id": {
      "type": "exec"
    }
  }
}
...this Vector event is produced:
{
  "data_stream": "stdout",
  "host": "my-host.local",
  "message": "64 bytes from 127.0.0.1: icmp_seq=0 ttl=64 time=0.060 ms",
  "pid": 5678,
  "source_type": "exec",
  "timestamp": "2020-03-13T20:45:38.119Z"
}

How it works

Context

By default, the exec source augments events with helpful context keys.

Line Delimiters

Each line is read until a new line delimiter, the 0xA byte, is found or the end of the maximum_buffer_size_bytes is reached.

Shutting Down

When Vector begins shutting down (typically due to a SIGTERM), this source will signal to the child process to terminate, if it is running, to shut down.

On *nix platforms, Vector will issue a SIGTERM to the child process, allowing it to gracefully shutdown, and the source will continue reading until the process exits or Vector’s shutdown grace period expires.

On Windows, the subprocess will be issued a SIGKILL and terminate abruptly. In the future we hope to support graceful shutdown of Windows processes as well.

State

This component is stateless, meaning its behavior is consistent across each input.
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