Kapacitor command line client

Two key executables are packaged as a part of Kapacitor. The kapacitord daemon runs the Kapacitor server, including its HTTP interface. The kapacitor command line interface (CLI) leverages the HTTP interface and other resources, to provide access to many Kapacitor features.

A general introduction to the kapacitor client is presented in the Getting started with Kapacitor.

When executed the client can take two options and one command followed by arguments applicable to that command.

kapacitor [options] [command] [args]

This document provides an overview of the commands provided by the kapacitor CLI:

• General options
• Core commands
• Server management
  • Services
  • Logging
• Data sampling
• Topics and topic handlers
• Tasks and task templates
• Flux tasks

General options

By default the client attempts HTTP communication with the server running on localhost at port 9092. The server can also be deployed with SSL enabled. Two command line options make it possible to override the default communication settings and to use the client against any Kapacitor server.

-url

The -url option supplies an HTTP url string (http(s)://host:port) to the Kapacitor server. When not set on the command line the value of the environment variable KAPACITOR_URL is used. This can be used to run kapacitor commands on a remote Kapacitor server.

export KAPACITOR_URL=https://192.168.67.88:9092?u=username&p=password

# When KAPACITOR_URL is defined, the -url flag isn't necessary.
kapacitor list tasks

-skipVerify

The -skipVerify option disables SSL verification. This option should be used when connecting to a Kapacitor server secured using a self-signed SSL certificate. When not set on the command line, the value of the environment variable KAPACITOR_UNSAFE_SSL is used.

Use command line options

$ kapacitor -skipVerify -url https://192.168.67.88:9093 list tasks
ID                                                 Type      Status    Executing Databases and Retention Policies
batch_load_test                                    batch     enabled   true      ["telegraf"."autogen"]
chronograf-v1-b12b2554-cf38-4d7e-af24-5b0cd3cecc54 stream    enabled   true      ["telegraf"."autogen"]
cpu_alert                                          stream    disabled  false     ["telegraf"."autogen"]
cpu_alert_topic                                    stream    disabled  false     ["telegraf"."autogen"]
top_scores                                         stream    disabled  false     ["game"."autogen"]

Core commands

Core commands are those most common in a command line application or are those which are the most commonly used.

help

The help command brings up the help message. To get more detailed help on any command type kapacitor help <command>.

version

The version command prints out the release version of the kapacitor client.

list

The list command can be used to print out lists of different Kapacitor artifacts.

delete

The delete command can be used to remove different Kapacitor artifacts.

The commands list and delete are presented in more detail in the following sections.

Server management

The kapacitor client can be used to investigate aspects of the server, to backup its data and to work with logs. One planned feature will be the ability to push task definitions to other servers.

backup

The backup command creates a backup of the Kapacitor database at a specified filepath.

# Syntax
kapacitor backup [PATH_TO_BACKUP_FILE]

# Example
kapacitor backup ~/bak/kapacitor-20180101.db

stats

The stats command displays statistics about the Kapacitor server. It requires either the general or ingress argument.

# Syntax
kapacitor stats <general|ingress>

stats general

Use kapacitor stats general to view values such as the server ID or hostname and counts such as the number of tasks and subscriptions used by Kapacitor.

$ kapacitor stats general
ClusterID:                    ef3b3f9d-0997-4c0b-b1b6-5d0fb37fe509
ServerID:                     90582c9c-2e25-4654-903e-0acfc48fb5da
Host:                         localhost
Tasks:                        8
Enabled Tasks:                2
Subscriptions:                12
Version:                      1.7.1~n201711280812

stats ingress

Use the kapacitor stats ingress command to view InfluxDB measurements and the number of data points that pass through the Kapacitor server. This command can be used to ensure InfluxDB data is being written to Kapacitor.

$ kapacitor stats ingress
Database   Retention Policy Measurement    Points Received
_internal  monitor          cq                        5274
_internal  monitor          database                 52740
_internal  monitor          httpd                     5274
_internal  monitor          queryExecutor             5274
_internal  monitor          runtime                   5274
_internal  monitor          shard                   300976
_internal  monitor          subscriber              126576
_internal  monitor          tsm1_cache              300976
_internal  monitor          tsm1_engine             300976
_internal  monitor          tsm1_filestore          300976
_internal  monitor          tsm1_wal                300976
_internal  monitor          write                     5274
_kapacitor autogen          edges                    26370
_kapacitor autogen          ingress                  73817
_kapacitor autogen          kapacitor                 2637
_kapacitor autogen          load                      2637
_kapacitor autogen          nodes                    23733
_kapacitor autogen          runtime                   2637
_kapacitor autogen          topics                   73836
chronograf autogen          alerts                    1560
telegraf   autogen          cpu                      47502
telegraf   autogen          disk                     31676
telegraf   autogen          diskio                   52800
telegraf   autogen          kernel                    5280
telegraf   autogen          mem                       5280
telegraf   autogen          processes                 5280
telegraf   autogen          swap                     10560
telegraf   autogen          system                   15840

vars

The vars command displays a wide range of variables associated with the Kapacitor server. Results are output in JSON format.

$ kapacitor vars
{"cluster_id": "39545771-7b64-4692-ab8f-1796c07f3314",
"cmdline": ["kapacitord"],
"host": "localhost",
"kapacitor": {"795eb8bd-00b5-4a78-9a10-6190546e0a08": {"name": "nodes", "tags": {"host": ...

# Output example has been truncated

# Example using a Python JSON formatter
kapacitor vars | python -m json.tool

push

The push command is reserved for a planned feature which will allow tasks to be pushed from one Kapacitor server to another.

Services

Services are functional modules of the Kapacitor server that handle communications with third-party applications, server configuration, and the discovery and scraping of data. For more information about services see the Configuration documentation.

list service-tests

The list service-tests lists all service tests currently available on the server.

# Syntax
kapacitor list service-tests [ <SERVICE_NAME> | <PATTERN> ]

# Example
kapacitor list service-tests

PATTERN can be a grep-like pattern. For example, to run tests of all services beginning with the letter ‘a’ use the string ‘a*’.

Example list services-test output

Service Name
alerta
azure
consul
dns
ec2
file-discovery
gce
hipchat
httppost
influxdb
kubernetes
marathon
mqtt
nerve
opsgenie
pagerduty
pushover
scraper
sensu
serverset
slack
smtp
snmptrap
static-discovery
swarm
talk
telegram
triton
victorops

service-tests

The service-tests command executes one or more of the available service tests.

kapacitor service-tests [ <SERVICE_NAME> | <PATTERN> ]

PATTERN can be a grep-like pattern. For example, to run tests of all services beginning with the letter ‘a’ use the string ‘a*’.

Example of running service tests

$ kapacitor service-tests slack talk smtp
Service             Success   Message
slack               true
talk                false     service is not enabled
smtp                false     service is not enabled

kapacitor list service-tests | xargs kapacitor service-tests

Logging

Kapacitor records a wealth of information about itself, its services and its tasks. Information about configuring logging is available in the Configuration document.

logs

The logs command outputs the entire Kapacitor log stream or the log stream of a specific service. Log streams can be filtered by log level.

# Syntax
kapacitor logs [service=<SERVICE_ID>] [lvl=<LEVEL>]

The value for lvl can be one of the following:

1. debug
2. info
3. error

By default this will return messages only for the selected level. To view messages for the selected level and higher, add a + character to the end of the string.

Monitoring log messages of level DEBUG and above for the HTTP service

$ kapacitor logs service=http lvl=debug+
ts=2018-01-15T10:47:10.017+01:00 lvl=info msg="http request" service=http host=127.0.0.1 username=- start=2018-01-15T10:47:10.014048161+01:00 method=POST uri=/write?consistency=&db=_internal&precision=ns&rp=monitor protocol=HTTP/1.1 status=204 referer=- user-agent=InfluxDBClient request-id=0e3c47c4-f9d9-11e7-85c5-000000000000 duration=3.234836ms
ts=2018-01-15T10:47:10.020+01:00 lvl=info msg="http request" service=http host=127.0.0.1 username=- start=2018-01-15T10:47:10.013091282+01:00 method=POST uri=/write?consistency=&db=_internal&precision=ns&rp=monitor protocol=HTTP/1.1 status=204 referer=- user-agent=InfluxDBClient request-id=0e3c2267-f9d9-11e7-85c4-000000000000 duration=7.555256ms
ts=2018-01-15T10:47:10.301+01:00 lvl=info msg="http request" service=http host=127.0.0.1 username=- start=2018-01-15T10:47:10.301315013+01:00 method=POST uri=/write?consistency=&db=telegraf&precision=ns&rp=autogen protocol=HTTP/1.1 status=204 referer=- user-agent=InfluxDBClient request-id=0e681d20-f9d9-11e7-85c7-000000000000 duration=306.967µs
ts=2018-01-15T10:47:10.301+01:00 lvl=info msg="http request" service=http host=127.0.0.1 username=- start=2018-01-15T10:47:10.301249656+01:00 method=POST uri=/write?consistency=&db=telegraf&precision=ns&rp=autogen protocol=HTTP/1.1 status=204 referer=- user-agent=InfluxDBClient request-id=0e681a95-f9d9-11e7-85c6-000000000000 duration=387.042µs
# ...

Tailing Kapacitor logs

To tail all Kapacitor logs, run the command without the service and level arguments.

$ kapacitor logs
ts=2018-01-15T10:54:07.884+01:00 lvl=info msg="created log session" service=sessions id=33a21e96-49d5-4891-aad8-0bc96099d148 content-type=
ts=2018-01-15T10:54:10.017+01:00 lvl=info msg="http request" service=http host=127.0.0.1 username=- start=2018-01-15T10:54:10.014885535+01:00 method=POST uri=/write?consistency=&db=_internal&precision=ns&rp=monitor protocol=HTTP/1.1 status=204 referer=- user-agent=InfluxDBClient request-id=0893527c-f9da-11e7-8672-000000000000 duration=2.870539ms
ts=2018-01-15T10:54:10.020+01:00 lvl=info msg="http request" service=http host=127.0.0.1 username=- start=2018-01-15T10:54:10.017509083+01:00 method=POST uri=/write?consistency=&db=_internal&precision=ns&rp=monitor protocol=HTTP/1.1 status=204 referer=- user-agent=InfluxDBClient request-id=0893b8f6-f9da-11e7-8673-000000000000 duration=2.920775ms
# ...

level

The level command sets the log level for the Kapacitor log stream written to the log file from the Kapacitor server. On Linux systems this file is located by default at /var/log/kapacitor/kapacitor.log. The form it takes is as follows:

kapacitor level <LEVEL>

The value for LEVEL can be one of the following:

1. debug
2. info
3. error

To see the command take effect, tail the log file (e.g., $sudo tail -f -n 128 /var/log/kapacitor/kapacitor.log) and then set the log level to error.

Set Kapacitor log level to ERROR

kapacitor level error

The stream to the Kapacitor log should appear to stop. To activate it again, reset the log level to debug.

Setting the log level to DEBUG

kapacitor level debug

The tailed stream should become active again.

watch

The watch command follows logs associated with a task.

# Syntax
kapacitor watch <TASK_ID> [<TAGS> ...]

Steam logs from the cpu_alert tasks**

$ kapacitor watch cpu_alert
ts=2018-01-15T11:31:30.301+01:00 lvl=debug msg="alert triggered" service=kapacitor task_master=main task=cpu_alert node=alert2 level=CRITICAL id=cpu:nil event_message="cpu:nil is CRITICAL" data="&{cpu map[cpu:cpu6 host:algonquin] [time usage_guest usage_guest_nice usage_idle usage_iowait usage_irq usage_nice usage_softirq usage_steal usage_system usage_user] [[2018-01-15 10:31:30 +0000 UTC 0 0 0 0 0 0 0 0 0 100.00000000000199]]}"
ts=2018-01-15T11:31:30.315+01:00 lvl=debug msg="alert triggered" service=kapacitor task_master=main task=cpu_alert node=alert2 level=OK id=cpu:nil event_message="cpu:nil is OK" data="&{cpu map[cpu:cpu7 host:algonquin] [time usage_guest usage_guest_nice usage_idle usage_iowait usage_irq usage_nice usage_softirq usage_steal usage_system usage_user] [[2018-01-15 10:31:30 +0000 UTC 0 0 99.89989989990681 0 0 0 0 0 0 0.1001001001001535]]}"
ts=2018-01-15T11:31:30.325+01:00 lvl=debug msg="alert triggered" service=kapacitor task_master=main task=cpu_alert node=alert2 level=CRITICAL id=cpu:nil event_message="cpu:nil is CRITICAL" data="&{cpu map[host:algonquin cpu:cpu6] [time usage_guest usage_guest_nice usage_idle usage_iowait usage_irq usage_nice usage_softirq usage_steal usage_system usage_user] [[2018-01-15 10:31:30 +0000 UTC 0 0 0 0 0 0 0 0 0 100.00000000000199]]}"
ts=2018-01-15T11:31:30.335+01:00 lvl=debug msg="alert triggered" service=kapacitor task_master=main task=cpu_alert node=alert2 level=OK id=cpu:nil event_message="cpu:nil is OK" data="&{cpu map[host:algonquin cpu:cpu7] [time usage_guest usage_guest_nice usage_idle usage_iowait usage_irq usage_nice usage_softirq usage_steal usage_system usage_user] [[2018-01-15 10:31:30 +0000 UTC 0 0 99.89989989990681 0 0 0 0 0 0 0.1001001001001535]]}"
# ...

Data sampling

At times it can be useful to record a sample of data or a query to troubleshoot tasks before they are enabled. The Kapacitor command line client includes a number of useful commands for managing data sampling.

record

The record command can be used to record either a snapshot of data or the result of an InfluxDB query into the Kapacitor database. The data snapshot is later accessible using its recording-id. Three types of recording are available: batch, stream and query.

record batch

kapacitor record batch records the result of an InfluxDB query used in a batch type task. It requires either a time value for a window of past data from now, defined by the argument -past or a past interval defined by the arguments -start and -stop. A -recording-id is optional and will be generated if not provided. The -task argument with its TASK_ID is also required. The optional Boolean argument -no-wait will spawn the replay into a separate process and exit leaving it to run in the background.

# Syntax
kapacitor record batch (-no-wait) [-past <WINDOW_IN_PAST> | -start <START_TIME> -stop <STOP_TIME>] [-recording-id <ID>] -task <TASK_ID>

# Example
kapacitor record batch -past 5m -recording-id BlueJaySilverTree -task batch_load_test

record stream

kapacitor record stream records a live stream of data. It requires a -duration value to determine how long the recording will run. The -task argument identifying the target task is also required A -recording-id value is optional. When not provided will be automatically generated. The optional boolean argument, -no-wait, will spawn the replay into a separate process and exit leaving it to run in the background.

# Syntax
kapacitor record stream -duration <DURATION> (-no-wait) (-recording-id <ID> ) -task <TASK_ID>

# Example
kapacitor record stream -duration 1m -task cpu_alert

record query

kapacitor record query records an InfluxDB query. It requires an InfluxDB query provided through the -query argument. It also requires a -type value of either batch or stream. A -recording-id can also be provided and when not provided will be generated. The optional boolean argument -no-wait will spawn the replay into a separate process and exit leaving it to run in the background.

# Syntax
kapacitor record query [-cluster <INFLUXDB_CLUSTER_NAME>] [-no-wait] -query <QUERY> [-recording-id <RECORDING_ID>] -type <stream|batch>

# Example
$ kapacitor record query -query 'SELECT cpu, usage_idle from "telegraf"."autogen"."cpu" where time > now() - 5m' -type stream

replay

The replay command replays a recording to a task to verify how the task will behave. It requires a recording ID provided through the -recording argument and a task ID provided through the -task argument. The optional boolean argument, -real-clock, will toggle replaying the data according to the intervals between the timestamps contained in the recording. The optional Boolean argument -rec-time will toggle using the actual recorded times instead of present times. Use of present times is the default behavior. An optional -replay-id can also be provided and when not provided will be generated. The optional Boolean argument -no-wait will spawn the replay into a separate process and exit leaving it to run in the background.

# Syntax
kapacitor replay [-no-wait] [-real-clock] [-rec-time] -recording <ID> [-replay-id <REPLAY_ID>] -task <TASK_ID>

# Example
$ kapacitor replay -recording 4e0f09c5-1426-4778-8f9b-c4a88f5c2b66 -task cpu_alert

replay-live

The replay-live command allows for data to be played on the fly to verify task behavior. It can be executed against either a batch or a query recording. Kapacitor neither saves nor records the data in its database.

replay-live query

With the query argument, the replay executes an InfluxDB query against the task. The query should include the database, retention policy and measurement string.

# Syntax
kapacitor replay-live query [-cluster <CLUSTER_URL>] [-no-wait] -query <QUERY> [-real-clock] [-rec-time] [-replay-id <REPLAY_ID>] -task <TASK_ID>

# Example
kapacitor replay-live query -task cpu_alert -query 'select cpu, usage_idle from "telegraf"."autogen"."cpu" where time > now() - 5m'

This command requires an InfluxDB query provided through the -query argument. It also requires a task identified by the -task argument. A -replay-id is option, but when not provided will be automatically generated. The optional boolean argument, -no-wait, will spawn the replay into a separate process and exit leaving it to run in the background. The optional boolean argument, -real-clock, will toggle replaying the data according to the intervals between the timestamps contained within. The optional boolean argument, -rec-time, will toggle using the actual recorded times instead of present times. Use of present times is the default behavior.

replay-live batch

With the batch argument the replay executes the task with batch data already stored to InfluxDB. It takes the following form:

# Syntax
kapacitor replay-live batch [-no-wait] [ -past <TIME_WINDOW> | -start <START_TIME> -stop <STOP_TIME> ] [-real-clock] [-rec-time] [-replay-id <REPLAY_ID>] -task <TASK_ID>

# Example
kapacitor replay-live batch -start 2018-01-16T00:00:00Z -stop 2018-01-16T12:00:00Z -replay-id GoldRoosterColdBridge180116 -task batch_load_test

This command requires either a time value for a window of past data from now, defined by the argument -past or a past interval defined by the arguments -start and -stop. A -replay-id is optional and will be generated if not provided. The -task argument with its TASK_ID is also required. The optional Boolean argument -no-wait will spawn the replay into a separate process and exit leaving it to run in the background. The optional Boolean argument -real-clock will toggle replaying the data according to the intervals between the timestamps contained within. The optional Boolean argument -rec-time will toggle using the actual recorded times instead of present times. Use of present times is the default behavior.

list recordings

The list recordings command can be used to list existing recordings and replays.

$ kapacitor list recordings
ID                                   Type    Status    Size      Date
0970bcb5-685c-48cc-9a92-741633633f1f stream  finished  3.2 kB    15 Jan 18 16:37 CET
78d3a26e-ea1f-4c52-bd56-2016997313fe stream  finished  23 B      15 Jan 18 15:33 CET
4e0f09c5-1426-4778-8f9b-c4a88f5c2b66 stream  finished  2.2 kB    15 Jan 18 15:25 CET
BlueJaySilverTree                    batch   finished  1.0 kB    15 Jan 18 15:18 CET
7d30caff-e443-4d5f-a0f2-6a933ea35284 batch   finished  998 B     15 Jan 18 15:17 CET

list replays

The list replays command to lists all replays.

$ kapacitor list replays
ID                                   Task            Recording                            Status   Clock   Date
d861ee94-aec1-43b8-b362-5c3d9a036aff cpu_alert       4e0f09c5-1426-4778-8f9b-c4a88f5c2b66 running  real    16 Jan 18 11:02 CET
GoldRoosterColdBridge180116          batch_load_test                                      finished fast    16 Jan 18 10:23 CET
2d9be22c-647a-425e-89fb-40543bdd3670 cpu_alert                                            finished fast    16 Jan 18 10:12 CET
b972582b-5be9-4626-87b7-c3d9bfc67981 batch_load_test                                      finished fast    15 Jan 18 17:26 CET
c060f960-6b02-49a7-9376-0ee55952a7f0 cpu_alert                                            finished fast    15 Jan 18 17:25 CET
4a43565c-4678-4c98-94b7-e534efdff860 cpu_alert       4e0f09c5-1426-4778-8f9b-c4a88f5c2b66 finished fast    15 Jan 18 16:52 CET
31f8ea34-455b-4eee-abf2-ed1eb60166a5 cpu_alert       4e0f09c5-1426-4778-8f9b-c4a88f5c2b66 finished real    15 Jan 18 16:50 CET
bbe8567c-a642-4da9-83ef-2a7d32ad5eb1 cpu_alert       4e0f09c5-1426-4778-8f9b-c4a88f5c2b66 finished fast    15 Jan 18 16:49 CET

delete recordings

The delete recordings command deletes one or more recordings.

# Syntax
kapacitor delete recordings <Recording-ID | Pattern>

# Examples
kapacitor delete recordings d861ee94-aec1-43b8-b362-5c3d9a036aff
kapacitor delete recordings "test*"

ID needs to be the full ID of the recording, preferably copied and pasted from the results of the list recordings command.

Pattern can be a grep-like pattern used to identify a set of recordings. For example, if the value test0<N> was assigned to multiple recording-ids, (e.g. test01, test02, test03) then all test recordings could be removed with the pattern "test*".

This command returns no status or additional messages. It fails or succeeds silently. To verify results, use the list recordings command.

delete replays

The delete replays command deletes one or more replays.

# Syntax
kapacitor delete replays <Replay-ID | Pattern>

# Examples
kapacitor delete replays d861ee94-aec1-43b8-b362-5c3d9a036aff
kapacitor delete replays "jan-run*"

ID needs to be the full ID of the replay, preferably copied and pasted from the results of the list replays command.

Pattern can be a grep-like pattern used to identify a set of replays. For example, if the value test0<N> was assigned to multiple replay-ids, (e.g. jan-run01, jan-run02, jan-run03) then all run replays could be removed with the pattern "jan-run*".

This command returns no status or additional messages. It fails or succeeds silently. To verify the results, use the list replays command.

Topics and topic handlers

Topics are classes of subjects to which alerts can publish messages and to which other services can subscribe in order to receive those messages. Topic handlers bind topics to services, allowing messages to be forwarded by various means.

Working with topics and topic handlers is introduced in the Using alert topics documentation.

Topics are created through the topic() method of the AlertNode in TICKscripts.

define-topic-handler

The define-topic-handler command defines or redefines a topic handler based on the contents of a topic handler script.

# Syntax
kapacitor define-topic-handler <PATH_TO_HANDLER_SCRIPT>

# Example
$ kapacitor define-topic-handler ./slack_cpu_handler.yaml

This command returns no status or additional messages. It fails or succeeds silently. To verify the results, use the list topic-handlers command.

list topics

The list topics displays all topics currently stored by Kapacitor.

$ kapacitor list topics
ID                                                             Level     Collected
1252f40d-c998-430d-abaf-277c43d390e1:cpu_alert:alert2          OK                0
32fdb276-4d60-42bc-8f5d-c093e97bd3d0:batch_cpu_alert:alert2    OK                0
666c444c-a33e-42b5-af4d-732311b0e148:batch_cpu_alert:alert2    CRITICAL          0
cpu                                                            OK                0
main:batch_load_test:alert2                                    OK                7
main:chronograf-v1-b12b2554-cf38-4d7e-af24-5b0cd3cecc54:alert3 OK             1028
main:chronograf-v1-e77137c5-dcce-4fd5-a612-3cdaa5f98ef9:alert7 OK                0
main:cpu-alert-test:alert3                                     OK                0

list topic-handlers

The list topic-handlers command displays handlers stored by Kapacitor.

$ kapacitor list topic-handlers
Topic      ID         Kind
cpu        slack      slack

show-topic

Use the show-topic command to see the details of a topic.

# Syntax
kapacitor show-topic [TOPIC_ID]

# Example
$ kapacitor show-topic 1252f40d-c998-430d-abaf-277c43d390e1:cpu_alert:alert2
ID: 1252f40d-c998-430d-abaf-277c43d390e1:cpu_alert:alert2
Level: OK
Collected: 0
Handlers: []
Events:
Event   Level    Message       Date
cpu:nil OK       cpu:nil is OK 13 Nov 17 13:34 CET

show-topic-handler

The show-topic-handler command outputs the topic-handler’s contents to the console.

# Syntax
kapacitor show-topic-handler [TOPIC_ID] [HANDLER_ID]

# Example
$ kapacitor show-topic-handler cpu slack
ID: slack
Topic: cpu
Kind: slack
Match:
Options: {"channel":"#kapacitor"}

delete topics

Use the delete topics command to remove one or more topics.

# Syntax
kapacitor delete topics <Topic-ID | Pattern>

# Examples
kapacitor delete topics 1252f40d-c998-430d-abaf-277c43d390e1:cpu_alert:alert2
kapacitor delete topics "cluster*"

Pattern can be a grep-like pattern used to identify a set of topics. For example, if the value cluster0<N> was assigned to multiple topics, (e.g. cluster01, cluster02, cluster03), then all cluster topics could be removed with the pattern "cluster*".

This command returns no status or additional messages. It fails or succeeds silently. To verify the results, use the list topics command.

delete topic-handlers

The topic-handlers command removes a topic handler.

# Syntax
kapacitor delete topic-handlers [TOPIC_ID] [HANDLER_ID]

# Example
kapacitor delete topic-handlers cpu slack

This command returns no status or additional messages. It fails or succeeds silently. To verify the results, use the list topics command.

Tasks and task templates

Tasks and task definitions comprise the core Kapacitor functionality. Tasks are introduced in the Getting Started guide and are explored in detail along side the TICKscript.

Task templates make it easy to reuse generic task structures to create a suite of similar tasks. They are introduced in the Template Tasks document.

define

The define command is used to create a new task from a TICKscript. It takes one of the following three forms:

1. As a straight-forward task
2. From a template
3. From a template with a descriptor file

Define a straight-forward task

# Syntax
kapacitor define <TASK_ID> -tick <PATH_TO_TICKSCRIPT> -type <stream|batch> [-no-reload] -dbrp <DATABASE>.<RETENTION_POLICY>

# Example
kapacitor define sandbox -tick sandbox.tick -type stream -dbrp "telegraf"."autogen"

This form of the define command requires a new or existing task identifier provided immediately after the define token. If the identifier does not yet exist in Kapacitor, a new task will be created. If the identifier already exists, the existing task will be updated. A required path to a TICKscript is provided through the argument tick. The -type of task is also required, as is the target database and retention policy identified by the argument -dbrp. The optional Boolean argument -no-reload will prevent reloading the task into memory. The default behavior is to reload an updated task.

This command returns no status or additional messages. Some error messages associated with malformed or invalid TICKscripts may be returned. To verify the results, use the list tasks command.

Define a task from a template

# Syntax
kapacitor define <TASK_ID> -template <TEMPLATE_ID> -vars <PATH_TO_VARS_FILE> [-no-reload] -dbrp <DATABASE>.<RETENTION_POLICY>

# Example
kapacitor define cpu_idle -template generic_mean_alert -vars cpu_vars.json -dbrp "telegraf"."autogen"

This form of the define command requires a new or existing task identifier provided immediately after the define token. If the identifier does not yet exist in Kapacitor, a new task will be created. If the identifier already exists, the existing task will be updated. The required template to be used is identified with the -template argument. The target database and retention policy identified by the argument -dbrp is also required as is a path to the file containing variable definitions identified by the -var argument. The optional Boolean argument -no-reload will prevent reloading the task into memory. The default behavior is to reload an updated task.

This task returns no status or additional messages. To verify the results, use the list tasks command.

Define a task from a template with a descriptor file

# Syntax
kapacitor define <TASK_ID> -file <PATH_TO_TEMPLATE_FILE> [-no-reload]

# Example
kapacitor define mem_alert -file mem_alert_from_template.json

This form of the define command requires a new or existing task identifier provided immediately after the define token. If the identifier does not yet exist in Kapacitor a new task will be created. If the identifier already exists the existing task will be updated. A path to the file defining the template, database and retention policy and variables is required and provided through the -file argument. The optional Boolean argument -no-reload will prevent reloading the task into memory. The default behavior is to reload an updated task.

This task returns no status or additional messages. To verify the results, use the list tasks command.

define-template

Use this command to load a task template to Kapacitor. It takes the following form:

# Syntax
kapacitor define-template <TEMPLATE_ID> -tick <PATH_TO_TICKSCRIPT> -type <string|batch>

# Example
kapacitor define-template generic_mean_alert -tick template-task.tick -type stream

This command requires a new or existing template identifier provided immediately after the define-template token. If the identifier does not yet exist in Kapacitor a new template will be created. If the identifier already exists the existing template will be updated. The path to a TICKscript defining the template is also required and is provided through the argument -tick. Finally the -type of task must also be defined.

This task returns no status or additional messages. To verify the results, use the list templates command.

enable

The enable command enables one or more tasks. When tasks are first created, they are in a disabled state.

# Syntax
kapacitor enable <TASK_ID>

# Example
kapacitor enable cpu_alert

This command returns no status or additional messages. To verify the results, use the list tasks command.

disable

The disable command disables one or more active tasks.

# Syntax
kapacitor disable <TASK_ID>...

# Examples
kapacitor disable cpu_alert
kapacitor disable cpu_alert cpu_alert_topic sandbox

This command returns no status or additional messages. To verify the result, use the list tasks command.

reload

The reload command disables and then reenables one or more tasks. It’s useful when troubleshooting a tasks to stop and start it again.

# Syntax
kapacitor reload <TASK_ID>
kapacitor reload cpu_alert

This command returns no status or additional messages. To verify the result use the list tasks command.

list tasks

The list tasks command displays all tasks currently stored by Kapacitor.

$ kapacitor list tasks
ID                                                 Type      Status    Executing Databases and Retention Policies
8405b862-e488-447d-a021-b1b7fe0d7194               stream    disabled  false     ["telegraf"."autogen"]
batch_load_test                                    batch     enabled   true      ["telegraf"."autogen"]
chronograf-v1-b12b2554-cf38-4d7e-af24-5b0cd3cecc54 stream    enabled   true      ["telegraf"."autogen"]
cpu_alert                                          stream    enabled   true      ["telegraf"."autogen"]
cpu_idle                                           stream    disabled  false     ["telegraf"."autogen"]
sandbox                                            stream    disabled  false     ["blabla"."autogen"]

list templates

The list templates command displays all templates currently stored by Kapacitor.

$ kapacitor list templates
ID                 Type      Vars
generic_mean_alert stream    crit,field,groups,measurement,slack_channel,warn,where_filter,window

show

The show command outputs the details of a task.

# Syntax
kapacitor show [-replay <REPLAY_ID>] <TASK_ID>

# Example
kapacitor show cpu_alert

REPLAY_ID is the identifier of a currently running replay.

Example show task output

ID: cpu_alert
Template: template_id (included if task was created from a template)
Error:
Template:
Type: stream
Status: enabled
Executing: true
Created: 13 Nov 17 13:38 CET
Modified: 16 Jan 18 17:11 CET
LastEnabled: 16 Jan 18 17:11 CET
Databases Retention Policies: ["telegraf"."autogen"]
TICKscript:
stream
    // Select just the cpu measurement from our example database.
    |from()
        .measurement('cpu')
    |alert()
        .crit(lambda: int("usage_idle") < 70)
        // Whenever we get an alert write it to a file.
        .log('/tmp/alerts.log')

DOT:
digraph cpu_alert {
graph [throughput="0.00 points/s"];

stream0 [avg_exec_time_ns="0s" errors="0" working_cardinality="0" ];
stream0 -> from1 [processed="2574"];

from1 [avg_exec_time_ns="1.92µs" errors="0" working_cardinality="0" ];
from1 -> alert2 [processed="2574"];

alert2 [alerts_triggered="147" avg_exec_time_ns="1.665189ms" crits_triggered="104" errors="0" infos_triggered="0" oks_triggered="43" warns_triggered="0" working_cardinality="1" ];
}

show-template

The show-template command outputs the details of a task template.

# Syntax
kapacitor show-template <TEMPLATE_ID>

# Example
kapacitor show-template generic_mean_alert

Example show-template output

ID: generic_mean_alert
Error:
Type: stream
Created: 25 Oct 17 10:12 CEST
Modified: 16 Jan 18 16:52 CET
TICKscript:
// Which measurement to consume
var measurement string

// Optional where filter
var where_filter = lambda: TRUE

// Optional list of group by dimensions
var groups = [*]

// Which field to process
var field string

// Warning criteria, has access to 'mean' field
var warn lambda

// Critical criteria, has access to 'mean' field
var crit lambda

// How much data to window
var window = 5m

// The slack channel for alerts
var slack_channel = '#kapacitor'

stream
    |from()
        .measurement(measurement)
        .where(where_filter)
        .groupBy(groups)
    |window()
        .period(window)
        .every(window)
    |mean(field)
    |alert()
        .warn(warn)
        .crit(crit)
        .slack()
        .channel(slack_channel)

Vars:
Name                          Type      Default Value                           Description
crit                          lambda    <required>                              Critical criteria, has access to 'mean' field
field                         string    <required>                              Which field to process
groups                        list      [*]                                     Optional list of group by dimensions
measurement                   string    <required>                              Which measurement to consume
slack_channel                 string    #kapacitor                              The slack channel for alerts
warn                          lambda    <required>                              Warning criteria, has access to 'mean' field
where_filter                  lambda    TRUE                                    Optional where filter
window                        duration  5m0s                                    How much data to window
DOT:
digraph generic_mean_alert {
stream0 -> from1;
from1 -> window2;
window2 -> mean3;
mean3 -> alert4;
}

delete tasks

The delet tasks command removes one or more tasks.

# Syntax
kapacitor delete tasks <Task-IDs | Pattern>

# Example
kapacitor delete tasks 8405b862-e488-447d-a021-b1b7fe0d7194

Pattern can be a GREP like pattern used to identify a set of tasks. For example if the value cpu0<N> was assigned to multiple tasks, (e.g. cpu01, cpu02, cpu03) then all cpu tests could be removed with the pattern "cpu*".

This command returns no status or additional messages. It fails or succeeds silently. To verify the results, use the list tasks command.

delete templates

The delete templates command removes one or more templates.

# Syntax
kapacitor delete templates <Template-IDs | Pattern>

# Example
kapacitor delete templates generic_mean_alert

Pattern can be a GREP like pattern used to identify a set of task templates. For example if the value generic0<N> was assigned to multiple templates, (e.g. generic01, generic02, generic03) then all generic templates could be removed with the pattern "generic*".

This command returns no status or additional messages. It fails or succeeds silently. To verify the results, use the list templates command.

Flux tasks

The flux tasks command and its sub-commands manage Kapacitor Flux tasks.

• flux task create
• flux task list
• flux task update
• flux task retry-failed
• flux task log list
• flux task run list
• flux task run retry

flux task create

The kapacitor flux task create command creates a new Kapacitor Flux task.

kapacitor flux task create [flags] [flux script or '-' to read from stdin]

Flags

For usage examples, see Create Kapacitor Flux tasks.

flux task list

The kapacitor flux task list command lists Kapacitor Flux tasks.

kapacitor flux task list [flags]

Aliases: find, ls

Flags

For usage examples, see List Kapacitor Flux tasks.

flux task update

The kapacitor flux task update command updates a Kapacitor Flux task.

kapacitor flux task update [flags] [flux script or '-' for stdin]

Flags

For usage examples, see Update Kapacitor Flux tasks.

flux task retry-failed

The kapacitor flux task retry-failed command retries failed Kapacitor Flux task runs.

kapacitor flux task retry-failed [flags]

Flags

For usage examples, see Retry failed Kapacitor Flux tasks.

flux task log list

The kapacitor flux task log list command outputs Kapacitor Flux task logs.

kapacitor flux task log list [flags]

Flags

For usage examples, see View Kapacitor Flux task logs.

flux task run list

The kapacitor flux task run list command lists runs of a Kapacitor Flux task.

kapacitor flux task run list [flags]

Aliases: find, ls

Flags

For usage examples, see Mange Kapacitor Flux task runs.

flux task run retry

The kapacitor flux task run retry command retries a run for a Kapacitor Flux task.

kapacitor flux task run retry [flags]

Flags

For usage examples, see Mange Kapacitor Flux task runs.