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Scale applications based on a threshold reached by a specific measure from OpenStack Metric API.
Trigger Specification
This specification describes the openstack-metric trigger for OpenStack metrics.
The OpenStack metric API follows Gnocchi API. Attempt to the fact that Gnocchi API is an open-source time series database embedded in OpenStack system and every parameter on OpenStack Metric API follows its patterns but you don’t need to reference anything from Gnocchi. It scales based on a specific measure from a given resource metric. It’s highly recommended to check Gnocchi docs.
triggers:
- type: openstack-metric
metadata:
metricsURL: http://localhost:8041/v1/metric #required
metricID: 003bb589-166d-439d-8c31-cbf098d863de #required
aggregationMethod: "mean" #required
granularity: 300 #required (seconds)
threshold: "1.250" #required
activationThreshold: "0.250" #optional
timeout: 30 #optional
Protocol (http or https) should always be provided when specifying URLs
Parameter list:
metricsURL- The URL to check for the metrics API, based. It must contain the hostname, the metric port, the API version, and the resource ID. The pattern is:http://<host>:<metric_port>/<openstack_metric_api_version>/<resource_id>/metric.metricID- The Id of the intendend metric.aggregationMethod- The aggregation method that will be used to calculate metrics, it must follows the configured possible metrics derived from gnocchi API like:mean,min,max,std,sum,count, the complete aggregation methods list can be found here.granularity- The configured granularity from metric collection in seconds. it must follow the same value configured in OpenStack, but it must be coutned in seconds. Sample: If you have a 5 minutes time window granularity defined, so you must input a value of 300 seconds (5*60).threshold- The target value that, when reached, will scale the application. (This value can be a float)activationThreshold- Target value for activating the scaler. Learn more about activation here.(Default:0, Optional, This value can be a float)timeout- The timeout, in seconds, for the HTTP client requests that will query the Metric API. (Default:30, Optional)
Authentication Parameters
To authenticate, this scaler uses tokens. Tokens are automatically retrieved by the scaler from Keystone, the official OpenStack Identity Provider. You can provide your credentials using Secrets either by using the “password” method or the “application credentials” method. Both cases use TriggerAuthentication.
Password
authURL- The Keystone authentication URL. The pattern is:http://<host>:<keystone_port>/<keystone_version>/.userID- The OpenStack project user ID.password- The password for the provided user.projectID- The OpenStack project ID.
Application Credentials
authURL- The Keystone authentication URL. The pattern is:http://<host>:<keystone_port>/<keystone_version>/.appCredentialID- The Application Credential ID.appCredentialSecret- The Application Credential secret.
Example
Password method
Here is an example of how to deploy a scaled object with the openstack-metric scale trigger which uses TriggerAuthentication and the Password method from above.
apiVersion: v1
kind: Secret
metadata:
name: openstack-secret-password
namespace: default
type: Opaque
data:
authURL: aHR0cDovL2xvY2FsaG9zdDo1MDAwL3YzLw==
userID: MWYwYzI3ODFiNDExNGQxM2E0NGI4ODk4Zjg1MzQwYmU=
password: YWRtaW4=
projectID: YjE2MWRjNTE4Y2QyNGJkYTg0ZDk0ZDlhMGU3M2ZjODc=
---
apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
name: metrics-password-trigger-authentication
namespace: default
spec:
secretTargetRef:
- parameter: authURL
name: openstack-secret-password
key: authURL
- parameter: userID
name: openstack-secret-password
key: userID
- parameter: password
name: openstack-secret-password
key: password
- parameter: projectID
name: openstack-secret-password
key: projectID
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
name: openstack-metric-scaledobject
namespace: default
spec:
scaleTargetRef:
name: my-deployment
pollingInterval: 10
cooldownPeriod: 10
minReplicaCount: 0
triggers:
- type: openstack-metric
metadata:
metricsURL: http://localhost:8041/v1/metric
metricID: faf01aa5-da88-4929-905d-b83fbab46771
aggregationMethod: "mean"
granularity: 300
threshold: 1250
timeout: 30
authenticationRef:
name: openstack-metric-password-trigger-authentication
Application Credentials method
You can also use the Application Credentials method.
apiVersion: v1
kind: Secret
metadata:
name: openstack-secret-appcredentials
namespace: default
type: Opaque
data:
authURL: aHR0cDovL2xvY2FsaG9zdDo1MDAwL3YzLw==
appCredentialID: OWYyY2UyYWRlYmFkNGQxNzg0NTgwZjE5ZTljMTExZTQ=
appCredentialSecret: LVdSbFJBZW9sMm91Z3VmZzNEVlBqcll6aU9za1pkZ3c4Y180XzRFU1pZREloT0RmajJkOHg0dU5yb3NudVIzWmxDVTZNLTVDT3R5NDFJX3M5R1N5Wnc=
---
apiVersion: keda.sh/v1alpha1
kind: TriggerAuthentication
metadata:
name: openstack-metric-appcredentials-trigger-authentication
namespace: default
spec:
secretTargetRef:
- parameter: authURL
name: openstack-secret-appcredentials
key: authURL
- parameter: appCredentialID
name: openstack-secret-appcredentials
key: appCredentialID
- parameter: appCredentialSecret
name: openstack-secret-appcredentials
key: appCredentialSecret
---
apiVersion: keda.sh/v1alpha1
kind: ScaledObject
metadata:
name: openstack-metric-scaledobject
namespace: default
spec:
scaleTargetRef:
name: my-deployment
pollingInterval: 10
cooldownPeriod: 10
minReplicaCount: 0
triggers:
- type: openstack-metric
metadata:
metricsURL: http://localhost:8041/v1/metric
metricID: faf01aa5-da88-4929-905d-b83fbab46771
aggregationMethod: "mean"
granularity: 300
threshold: 1250
authenticationRef:
name: openstack-metric-appcredentials-trigger-authentication