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Trigger Specification
This specification describes the mongodb trigger that scales based on result of MongoDB query.
triggers: - type: mongodb metadata: # name of an environment variable containing a valid MongoDB connection string connectionStringFromEnv: MongoDB_CONNECTION_STRING # Required: database name dbName: "test" # Required: collection name collection: "test_collection" # Required: query expr, used by filter data query: '{"region":"eu-1","state":"running","plan":"planA"}' # Required: according to the number of query result, to scale the TargetRef queryValue: "1" # Optional: according to the number of query result, the scaler is active activationQueryValue: "1" # Optional: The generated metric name would be mongodb-global-metric. Here mongodb- use as a prefix for metric name metricName: "global-metric" Alternatively, you can configure connection parameters explicitly instead of providing a connection string:
triggers: - type: mongodb metadata: # host name of the MongoDB server. Example of mongodb service: "mongodb-svc.<namespace>.svc.cluster.local" host: mongodb-svc.default.svc.cluster.local # port number of the MongoDB server. port: "27017" # username credential for connecting to the MongoDB server username: test_user # name of an environment variable containing a valid password for connecting to the MongoDB server passwordFromEnv: MongoDB_Password # Required: database name dbName: "test" # Required: collection name collection: "test_collection" # Required: query expr, used by filter data query: '{"region":"eu-1","state":"running","plan":"planA"}' # Required: according to the number of query result, to scale the TargetRef queryValue: "1" # Optional: according to the number of query result, the scaler is active activationQueryValue: "1" # Optional: The generated metric name would be mongodb-global-metric. Here mongodb- use as a prefix for metric name. metricName: "global-metric" NOTE: If metricName is not set, then one is generated based on trigger index and the
collection, for example: s0-mongodb-test_collection
Parameter list:
The mongodb trigger always requires the following information:
dbName- Name of the database.collection- Name of the collection.query- A MongoDB query that should return single numeric value.queryValue- A threshold that will define when scaling should occur.activationQueryValue- Target value for activating the scaler. Learn more about activation here. (Default:0, Optional)
To connect to the MongoDB server, you can provide either:
connectionStringFromEnv- The name of an environment variable containing a valid MongoDB connection string for connecting to the MongoDB server.
Or provide more detailed connection parameters explicitly (a connection string will be generated for you at runtime):
host- The host name of the MongoDB server.port- The port number of the MongoDB server.username- Username to authenticate with to MongoDB database.passwordFromEnv- The name of an environment variable containing the password credential for connecting to the MongoDB server.
When configuring with a connection string, you can use this URL format:
mongodb://<username>:<password>@mongodb-svc.<namespace>.svc.cluster.local:27017/<database_name> You can also optionally assign a name to the metric using the metricName value. If not specified, the metricName will be generated automatically based on trigger index and collection name. For example: s1-mongodb-test_collection. The value will be prefixed with s{triggerIndex}-mongodb- .
Authentication Parameters
As an alternative to environment variables, You can authenticate with the MongoDB server by using connection string or password authentication via TriggerAuthentication or ClusterTriggerAuthentication configuration.
Connection String Authentication:
connectionString- Connection string for MongoDB server.
Password Authentication:
host- The host name of the MongoDB server.port- The port number of the MongoDB server.username- Username to authenticate with to MongoDB database.password- Password for the configured user to login to MongoDB server.dbName- Name of the database.
Example
Here is an example of how to deploy a scaled Job with the MongoDB scale trigger which uses TriggerAuthentication.
apiVersion: keda.sh/v1alpha1 kind: ScaledJob metadata: name: mongodb-job spec: jobTargetRef: template: spec: containers: - name: mongodb-update image: 1314520999/mongodb-update:latest args: - --dataBase=test - --collection=test_collection imagePullPolicy: IfNotPresent restartPolicy: Never backoffLimit: 1 pollingInterval: 30 # Optional. Default: 30 seconds maxReplicaCount: 30 # Optional. Default: 100 successfulJobsHistoryLimit: 0 # Optional. Default: 100. How many completed jobs should be kept. failedJobsHistoryLimit: 10 # Optional. Default: 100. How many failed jobs should be kept. triggers: - type: mongodb metadata: dbName: "test" collection: "test_collection" query: '{"region":"eu-1","state":"running","plan":"planA"}' queryValue: "1" metricName: "global-metric" authenticationRef: name: mongodb-trigger --- apiVersion: keda.sh/v1alpha1 kind: TriggerAuthentication metadata: name: mongodb-trigger spec: secretTargetRef: - parameter: connectionString name: mongodb-secret key: connect --- apiVersion: v1 kind: Secret metadata: name: mongodb-secret type: Opaque data: connect: bW9uZ29kYjovL3Rlc3RfdXNlcjp0ZXN0X3Bhc3N3b3JkQG1vbmdvZGItc3ZjLm1vbmdvREIuc3ZjLmNsdXN0ZXIubG9jYWw6MjcwMTcvdGVzdA==