icinga2/doc/9-icinga2-api.md

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Icinga 2 API

Introduction

The Icinga 2 API allows you to manage configuration objects and resources in a simple, programmatic way using HTTP requests.

The URL endpoints are logically separated allowing you to easily make calls to

This chapter will start with a general overview followed by detailed information about specific URL endpoints.

Requests

Any tool capable of making HTTP requests can communicate with the API, for example curl.

Requests are only allowed to use the HTTPS protocol so that traffic remains encrypted.

By default the Icinga 2 API listens on port 5665 which is shared with the cluster stack. The port can be changed by setting the bind_port attribute in the ApiListener configuration object in the /etc/icinga2/features-available/api.conf file.

Supported request methods:

Method Usage
GET Retrieve information about configuration objects. Any request using the GET method is read-only and does not affect any objects.
POST Update attributes of a specified configuration object.
PUT Create a new object. The PUT request must include all attributes required to create a new object.
DELETE Remove an object created by the API. The DELETE method is idempotent and does not require any check if the object actually exists.

HTTP Statuses

The API will return standard HTTP statuses including error codes.

When an error occurs, the response body will contain additional information about the problem and its source.

A status in the range between 200 and 299 generally means that the request was succesful and no error was encountered.

Return codes within the 400 range indicate that there was a problem with the request. Either you did not authenticate correctly, you are missing the authorization for your requested action, the requested object does not exist or the request was malformed.

A status in the range of 500 generally means that there was a server-side problem and Icinga 2 is unable to process your request currently.

Responses

Succesful requests will send back a response body containing a results list. Depending on the number of affected objects in your request, the results may contain one or more entries.

The output will be sent back as a JSON object:

{
    "results": [
        {
            "code": 200.0,
            "status": "Object was created."
        }
    ]
}

Authentication

There are two different ways for authenticating against the Icinga 2 API:

  • username and password using HTTP basic auth
  • X.509 certificate

In order to configure a new API user you'll need to add a new ApiUser configuration object. In this example root will be the basic auth username and the password attribute contains the basic auth password.

# vim /etc/icinga2/conf.d/api-users.conf

object ApiUser "root" {
  password = "icinga"
}

Alternatively you can use X.509 client certificates by specifying the client_cn the API should trust. The X.509 certificate has to be signed by the CA certificate that is configured in the ApiListener object.

# vim /etc/icinga2/conf.d/api-users.conf

object ApiUser "api-clientcn" {
  password = "CertificateCommonName"
}

An ApiUser object can have both methods configured. Sensitive information such as the password will not be exposed through the API itself.

New installations of Icinga 2 will automatically set up a new ApiUser named root with an auto-generated password in the /etc/icinga2/conf.d/api-users.conf file.

You can manually invoke the CLI command icinga2 api setup which will generate a new local CA, self-signed certificate and a new API user configuration.

Once the API user is configured make sure to restart Icinga 2:

# service icinga2 restart

You can test authentication by sending a GET request to the API:

$ curl -u root:icinga -k -s 'https://localhost:5665/v1'

In case you get an error message make sure to check the API user credentials.

Permissions

By default an API user does not have any permissions to perform actions on the URL endpoints.

Permissions for API users must be specified in the permissions attribute as array. The array items can be a list of permission strings with wildcard matches.

Example for an API user with all permissions:

permissions = [ "*" ]

A yet more sophisticated approach is to specify additional permissions and their filters. The latter must be defined as lamdba function returning a boolean expression.

The permission attribute contains the action and the specific capitalized object type name. Instead of the type name it is also possible to use a wildcard match.

The following example allows the API user to query all hosts and services with the custom host attribute os matching the regular expression ^Linux.

permissions = [
  {
    permission = "objects/query/Host"
    filter = {{ regex("^Linux", host.vars.os)  }}
  },
  {
    permission = "objects/query/Service"
    filter = {{ regex("^Linux", host.vars.os)  }}
  },
]

Available permissions for specific URL endpoints:

Permissions URL Endpoint
actions/<action> /v1/actions
config/query /v1/config
config/modify /v1/config
objects/query/<type> /v1/objects
objects/create/<type> /v1/objects
objects/modify/<type> /v1/objects
objects/delete/<type> /v1/objects
status/query /v1/status
events/<type> /v1/events

The required actions or types can be replaced by using a wildcard match ("*").

Parameters

Depending on the request method there are two ways of passing parameters to the request:

  • JSON body (POST, PUT)
  • Query string (GET, DELETE)

Reserved characters by the HTTP protocol must be passed url-encoded as query string, e.g. a space becomes %20.

Example for query string:

/v1/objects/hosts?filter=match(%22nbmif*%22,host.name)&attrs=host.name&attrs=host.state

Example for JSON body:

{ "attrs": { "address": "8.8.4.4", "vars.os" : "Windows" } }

Filters

Use the same syntax as for apply rule expressions for filtering specific objects.

Example for all services in NOT-OK state:

https://localhost:5665/v1/objects/services?filter=service.state!=0

Example for matching all hosts by name (Note: " are url-encoded as %22):

https://localhost:5665/v1/objects/hosts?filter=match(%22nbmif*%22,host.name)

Output Format

The request and reponse body contain a JSON encoded string.

Version

Each url contains the version string as prefix (currently "/v1").

URL Endpoints

The Icinga 2 API provides multiple URL endpoints:

URL Endpoints Description
/v1/actions Endpoint for running specific API actions.
/v1/config Endpoint for managing configuration modules.
/v1/objects Endpoint for querying, creating, modifying and deleting config objects.
/v1/status Endpoint for receiving icinga2 status and statistics.
/v1/events Endpoint for subscribing to API event streams.
/v1/types Endpoint for listing Icinga 2 configuration object types and their attributes.

Please check the respective sections for detailed urls and parameters.

Actions

There are several actions available for Icinga 2 provided by the actions URL endpoint.

In case you have been using the external commands in the past, the API actions provide a similar interface with filter capabilities for some of the more common targets which do not directly change the configuration.

Some actions require specific target types (e.g. type=Host) and a filter expression. For each object matching the filter the action in question is performed once.

In the following each the actions are listed with their parameters, targets and examples. The calls are first shown with all their possible query parameters and their type. Optional parameters are encapsulated by () and [] mark array parameters. If an optional parameter has no default value explicitly stated it is either 0, NULL, Empty depending on the type. Timestamps are always time_t, the seconds since the UNIX epoch.

Process Check Result Action

/v1/actions/process-check-result?exit_status=int&(plugin_output=string)&(performance_data[]=string)&\
(check_command[]=string)&(check_source=string)&(execution_end=time_t)&(execution_start=time_t)&\
(schedule_end=time_t)&(schedule_start=time_t)

Target: Service or Host

This is used to submit a passive check result for a service or host. Passive checks need to be enabled for the check result to be processed. The exit_status field should be one of the following for services: 0=OK, 1=WARNING, 2=CRITICAL, 3=UNKNOWN or for hosts: 0=OK, 1=CRITICAL. The plugin_output field contains text output from the service check, the performance data is submitted via performance_data as one array entry per ';' separated block.

Example:

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/actions/process-check-result?filter=service.name=="ping6"'

reschedule-check

/v1/actions/reschedule-check?next_check=time_t&force_check=boolean

Target: Service or Host

Schedules an active check of a collection of hosts or services at next_check. If the `forced_check" flag is set the checks are performed regardless of what time it is (e.g. timeperiod restrictions are ignored) and whether or not active checks are enabled on a host/service-specific or program-wide basis.

send-custom-notification

/v1/actions/send-custom-notification?author=string&comment=string&(force=bool)

Target: Service or Host

Allows you to send a custom host/service notification. Very useful in dire situations, emergencies or to communicate with all admins that are responsible for a host or service. The notification requires an author and a comment, though those may be empty. If force (default: false) is set to true the notification will be send regardless of downtimes or whether notifications are enabled or not.

delay-notification

/v1/actions/delay-notification?timestamp=time_t

Target: Service or Host

Delays the next notifications for a collection of services or hosts until timestamp. Note that this will only have an effect if the service stays in the same problem state that it is currently in. If the service changes to another state, a new notification may go out before the time you specify in the timestamp argument.

acknowledge-problem

/v1/actions/acknowledge-problem?author=string&comment=string&(expiry=time_t)&(sticky=bool)&(sticky=bool)

Target: Service or Host

Allows you to acknowledge the current problem for hosts or services. By acknowledging the current problem, future notifications (for the same state) are disabled. Acknowledgements require an author and a comment for documentation purposes, though both may be empty. If you set an expiry time the acknowledgement will vanish after that timestamp. If the sticky option is set (the default), the acknowledgement will remain until the host recovers. Otherwise the acknowledgement will automatically be removed when the host changes state. If the notify option is set, a notification will be sent out to contacts indicating that the current host problem has been acknowledged, if set to false (the default) there will be no notification.

remove-acknowledgement

/v1/actions/remove-acknowledgement

Target: Service or Host

Removes acknowledgements for services or hosts. Once the acknowledgement has been removed, notifications can once again be sent out.

add-comment

/v1/actions/add-comment?author=string&comment=string

Target: service or host

Adds a comment by author to services or hosts.

remove-comment

/v1/actions/remove-comment

Target: Service or Host

Removes ALL comments for services or hosts.

remove-comment-by-id

/v1/actions/remove-comment-by-id?comment_id=int

Target: None

Removes the comment with the legacy ID comment_id

schedule-downtime

/v1/actions/schedule-downtime?start_time=time_t&end_time=time_t&duration=int&author=string&comment=string&\
(fixed=bool)&(trigger_id=int)

Target: Host or Service

Schedules downtime for services or hosts. If the fixed argument is set to true (default: false) the downtime will start and end at the times specified by the start_time and end_time arguments. Otherwise, downtime will begin between start_time and start_end and last for duration seconds. The downtime can be triggered by another downtime entry if the trigger_id is set to the ID of another scheduled downtime entry. Set the trigger_id argument to zero (the default) if the downtime for the specified host should not be triggered by another downtime entry. All downtimes also need a comment and with it an author, even though both can be empty.

remove-downtime

/v1/actions/remove-downtime

Target: Host or Service

Removes ALL downtimes for services or hosts.

remove-downtime-by-id

/v1/actions/remove-downtime-by-id?downtime_id=int

Target: None

Removes the comment with the legacy ID downtime_id

shutdown-process

/v1/actions/shutdown-process

Target: None

Shuts down Icinga2. May or may not return.

restart-process

/v1/actions/restart-process

Target: None

Restarts Icinga2. May or may not return.

Event Streams

You can subscribe to event streams by sending a POST request. The following parameters need to be passed as url parameters:

Parameters Description
types Required. Event type(s). Multiple types as url parameters are supported.
queue Required. Unique queue name. Multiple HTTP clients can use the same queue with existing filters.
filter Optional. Filter for specific event attributes using filter expressions.

Event Stream Types

The following event stream types are available:

Type Description
CheckResult Check results for hosts and services.
StateChange Host/service state changes.
Notification Notification events including notified users for hosts and services.
AcknowledgementSet Acknowledgement set on hosts and services.
AcknowledgementCleared Acknowledgement cleared on hosts and services.
CommentAdded Comment added for hosts and services.
CommentRemoved Comment removed for hosts and services.
DowntimeAdded Downtime added for hosts and services.
DowntimeRemoved Downtime removed for hosts and services.
DowntimeTriggered Downtime triggered for hosts and services.

Note: Each type requires api permissions being set.

Example for all downtime events:

&types=DowntimeAdded&types=DowntimeRemoved&types=DowntimeTriggered

Event Stream Filter

Event streams can be filtered by attributes using the prefix event..

Example for the CheckResult type with the exit_code set to 2:

&types=CheckResult&filter=event.check_result.exit_status==2

Example for the CheckResult type with the service matching the string "random":

&types=CheckResult&filter=match%28%22random*%22,event.service%29

Event Stream Response

The event stream response is separated with new lines. The HTTP client must support long-polling and HTTP/1.1. HTTP/1.0 is not supported.

Example:

$ curl -k -s -u root:icinga -X POST 'https://localhost:5665/v1/events?queue=michi&types=CheckResult&filter=event.check_result.exit_status==2'

{"check_result":{ ... },"host":"www.icinga.org","service":"ping4","timestamp":1445421319.7226390839,"type":"CheckResult"}
{"check_result":{ ... },"host":"www.icinga.org","service":"ping4","timestamp":1445421324.7226390839,"type":"CheckResult"}
{"check_result":{ ... },"host":"www.icinga.org","service":"ping4","timestamp":1445421329.7226390839,"type":"CheckResult"}

Status and Statistics

Contains a list of sub URL endpoints which provide the status and statistics of available and enabled features. Any filters are ignored.

Example for the main URL endpoint /v1/status:

$ curl -k -s -u root:icinga 'https://localhost:5665/v1/status' | python -m json.tool
{
    "results": [
        {
            "name": "ApiListener",
			"perfdata": [ ... ],
			"status": [ ... ]
        },
        ...
        {
            "name": "IcingaAplication",
			"perfdata": [ ... ],
			"status": [ ... ]
        },
        ...
    ]
}

/v1/status is always available as virtual status URL endpoint. It provides all feature status information into a collected overview.

Example for the icinga application URL endpoint /v1/status/IcingaApplication:

$ curl -k -s -u root:icinga 'https://localhost:5665/v1/status/IcingaApplication' | python -m json.tool
{
    "results": [
        {
            "perfdata": [],
            "status": {
                "icingaapplication": {
                    "app": {
                        "enable_event_handlers": true,
                        "enable_flapping": true,
                        "enable_host_checks": true,
                        "enable_notifications": true,
                        "enable_perfdata": true,
                        "enable_service_checks": true,
                        "node_name": "icinga.org",
                        "pid": 59819.0,
                        "program_start": 1443019345.093372,
                        "version": "v2.3.0-573-g380a131"
                    }
                }
            }
        }
    ]
}

Config Objects

Provides functionality for all configuration object URL endpoints provided by config object types:

URL Endpoints Description
/v1/objects/hosts Endpoint for retreiving and updating Host objects.
/v1/objects/services Endpoint for retreiving and updating Service objects.
/v1/objects/notifications Endpoint for retreiving and updating Notification objects.
/v1/objects/dependencies Endpoint for retreiving and updating Dependency objects.
/v1/objects/users Endpoint for retreiving and updating User objects.
/v1/objects/checkcommands Endpoint for retreiving and updating CheckCommand objects.
/v1/objects/eventcommands Endpoint for retreiving and updating EventCommand objects.
/v1/objects/notificationcommands Endpoint for retreiving and updating NotificationCommand objects.
/v1/objects/hostgroups Endpoint for retreiving and updating HostGroup objects.
/v1/objects/servicegroups Endpoint for retreiving and updating ServiceGroup objects.
/v1/objects/usergroups Endpoint for retreiving and updating UserGroup objects.
/v1/objects/zones Endpoint for retreiving and updating Zone objects.
/v1/objects/endpoints Endpoint for retreiving and updating Endpoint objects.
/v1/objects/timeperiods Endpoint for retreiving and updating TimePeriod objects.

All object attributes are prefixed with their respective object type.

Example:

host.address

Output listing and url parameters use the same syntax.

API Objects and Joins

Icinga 2 knows about object relations, e.g. when querying a service object the query handler will automatically add the referenced host object and its attributes to the result set. If the object reference is null (e.g. no event_command defined), the joined results not added to the result set.

Note: Select your required attributes beforehand by passing them to your request. The default result set might get huge.

Each joined object will use its own attribute name as prefix for the attribute. There is an exception for multiple objects used in dependencies and zones.

Objects with optional relations (e.g. a host notification does not have services) will not be joined.

Object Type Object Relations (prefix name)
Service host, notification, check_command, event_command
Host notification, check_command, event_command
Notification host, service, command, period
Dependency child_host, child_service, parent_host, parent_service, period
User period
Zones parent

API Objects and Cluster Config Sync

Newly created or updated objects can be synced throughout your Icinga 2 cluster. Set the zone attribute to the zone this object belongs to and let the API and cluster handle the rest. Objects without zone attribute are only synced in the same (HA) zone.

Note

Cluster nodes must accept configuration for creating, modifying and deleting objects. Ensure that accept_config is set to true in the ApiListener object on each node.

If you add a new cluster instance, or boot an instance which was offline for a while, Icinga 2 takes care of the initial object sync for all objects created by the API.

More information about distributed monitoring, cluster and its configuration can be found here.

List All Objects

Send a GET request to /v1/objects/hosts to list all host objects and their attributes.

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/objects/hosts'

This works in a similar fashion for other config objects.

Create New Config Object

New objects must be created by sending a PUT request. The following parameters need to be passed inside the JSON body:

Parameters Description
name Required. Name of the newly created config object.
templates Optional. Import existing configuration templates for this object type.
attrs Required. Set specific object attributes for this object type.

If attributes are of the Dictionary type, you can also use the indexer format:

"attrs": { "vars.os": "Linux" }

Example fo creating the new host object google.com:

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/objects/hosts/google.com' \
-X PUT \
-d '{ "templates": [ "generic-host" ], "attrs": { "address": "8.8.8.8", "check_command": "hostalive", "vars.os" : "Linux" } }' \
| python -m json.tool
{
    "results": [
        {
            "code": 200.0,
            "status": "Object was created."
        }
    ]
}

Note: Host objects require the check_command attribute.

If the configuration validation fails, the new object will not be created and the response body contains a detailed error message. The following example omits the check_command attribute required by the host object.

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/objects/hosts/google.com' \
-X PUT \
-d '{ "attrs": { "address": "8.8.8.8", "vars.os" : "Linux" } }' \
| python -m json.tool
{
    "results": [
        {
            "code": 500.0,
            "errors": [
                "Error: Validation failed for object 'google.com' of type 'Host'; Attribute 'check_command': Attribute must not be empty."
            ],
            "status": "Object could not be created."
        }
    ]
}

Query Object

Send a GET request including the object name inside the url.

Example for the host google.com:

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/objects/hosts/google.com'

You can select specific attributes by adding them as url parameters using ?attrs=.... Multiple attributes must be added one by one, e.g. ?attrs=host.address&attrs=host.name.

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/objects/hosts/google.com?attrs=host.name&attrs=host.address' | python -m json.tool
{
    "results": [
        {
            "attrs": {
                "host.address": "8.8.8.8",
                "host.name": "google.com"
            }
        }
    ]
}

Modify Object

Existing objects must be modifed by sending a POST request. The following parameters need to be passed inside the JSON body:

Parameters Description
name Optional. If not specified inside the url, this is required.
templates Optional. Import existing object configuration templates.
attrs Required. Set specific object attributes for this object type.

If attributes are of the Dictionary type, you can also use the indexer format:

"attrs": { "vars.os": "Linux" }

Example for existing object google.com:

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/objects/hosts/google.com' \
-X POST \
-d '{ "attrs": { "address": "8.8.4.4", "vars.os" : "Windows" } }' \
| python -m json.tool
{
    "results": [
        {
            "code": 200.0,
            "name": "google.com",
            "status": "Attributes updated.",
            "type": "Host"
        }
    ]
}

Delete Host

You can delete objects created using the API by sending a DELETE request. Specify the object name inside the url.

Parameters Description
cascade Optional. Delete objects depending on the deleted objects (e.g. services on a host).

Note: Objects created by apply rules (services, notifications, etc) will implicitely require to pass the cascade parameter on host object deletion.

Example for deleting the host object google.com:

$ curl -u root:icinga -k -s 'https://localhost:5665/v1/objects/hosts/google.com?cascade=1' -X DELETE | python -m json.tool
{
    "results": [
        {
            "code": 200.0,
            "name": "google.com",
            "status": "Object was deleted.",
            "type": "Host"
        }
    ]
}

Configuration Management

The main idea behind configuration management is to allow external applications creating configuration packages and stages based on configuration files and directory trees. This replaces any additional SSH connection and whatnot to dump configuration files to Icinga 2 directly. In case you are pushing a new configuration stage to a package, Icinga 2 will validate the configuration asynchronously and populate a status log which can be fetched in a separated request.

Create Config Package

Send a POST request to a new config package called puppet in this example. This will create a new empty configuration package.

$ curl -k -s -u root:icinga -X POST https://localhost:5665/v1/config/packages/puppet | python -m json.tool
{
    "results": [
        {
            "code": 200.0,
            "package": "puppet",
            "status": "Created package."
        }
    ]
}

Create Configuration to Package Stage

Send a POST request to the URL endpoint /v1/config/stages including an existing configuration package, e.g. puppet. The request body must contain the files attribute with the value being a dictionary of file targets and their content.

The example below will create a new file called test.conf underneath the conf.d directory populated by the sent configuration. The Icinga 2 API returns the package name this stage was created for, and also generates a unique name for the package attribute you'll need for later requests.

Note: This example contains an error (chec_command), do not blindly copy paste it.

$ curl -k -s -u root:icinga -X POST -d '{ "files": { "conf.d/test.conf": "object Host \"cfg-mgmt\" { chec_command = \"dummy\" }" } }' https://localhost:5665/v1/config/stages/puppet | python -m json.tool
{
    "results": [
        {
            "code": 200.0,
            "package": "puppet",
            "stage": "nbmif-1441625839-0",
            "status": "Created stage."
        }
    ]
}

If the configuration fails, the old active stage will remain active. If everything is successful, the new config stage is activated and live. Older stages will still be available in order to have some sort of revision system in place.

Icinga 2 automatically creates the following files in the main configuration package stage:

File Description
status Contains the configuration validation exit code (everything else than 0 indicates an error).
startup.log Contains the configuration validation output.

You can fetch these files via API call after creating a new stage.

List Configuration Packages and their Stages

List all config packages, their active stage and other stages. That way you may iterate of all of them programmatically for older revisions and their requests.

The following example contains one configuration package puppet. The latter already has a stage created, but it is not active.

$ curl -k -s -u root:icinga https://localhost:5665/v1/config/packages | python -m json.tool
{
    "results": [
        {
            "active-stage": "",
            "name": "puppet",
            "stages": [
                "nbmif-1441625839-0"
            ]
        }
    ]
}

List Configuration Packages and their Stages

Sent a GET request to the URL endpoint /v1/config/stages including the package (puppet) and stage (nbmif-1441625839-0) name.

$ curl -k -s -u root:icinga https://localhost:5665/v1/config/stages/puppet/nbmif-1441625839-0 | python -m json.tool
{
    "results": [
...
        {
            "name": "startup.log",
            "type": "file"
        },
        {
            "name": "status",
            "type": "file"
        },
        {
            "name": "conf.d",
            "type": "directory"
        },
        {
            "name": "zones.d",
            "type": "directory"
        },
        {
            "name": "conf.d/test.conf",
            "type": "file"
        }
    ]
}

Fetch Configuration Package Stage Files

Send a GET request to the URL endpoint /v1/config/files including the package name, the stage name and the relative path to the file. Note: You cannot use dots in paths.

You can fetch a list of existing files in a configuration stage and then specifically request their content.

The following example fetches the faulty configuration inside conf.d/test.conf for further analysis.

$ curl -k -s -u root:icinga https://localhost:5665/v1/config/files/puppet/nbmif-1441625839-0/conf.d/test.conf
object Host "cfg-mgmt" { chec_command = "dummy" }

Note: The returned files are plain-text instead of JSON-encoded.

Configuration Package Stage Errors

Now that we dont have an active stage for puppet yet seen here, there must have been an error.

Fetch the startup.log file and check the config validation errors:

$ curl -k -s -u root:icinga https://localhost:5665/v1/config/files/puppet/imagine-1441133065-1/startup.log
...

critical/config: Error: Attribute 'chec_command' does not exist.
Location:
/var/lib/icinga2/api/packages/puppet/imagine-1441133065-1/conf.d/test.conf(1): object Host "cfg-mgmt" { chec_command = "dummy" }
                                                                                                       ^^^^^^^^^^^^^^^^^^^^^^

critical/config: 1 error

The output is similar to the manual configuration validation.