V3 Migration of Common Configuration

As stated in the top level V3 Migration guide, common configuration has been separated out from each service's private configuration. See the Service Configuration page for more details on the new Common Configuration.

There have also been changes to some sections of the common configuration in order to make them consistent and stream-lined for all EdgeX services

MessageBus

In EdgeX 3.0 the EdgeX MessageBus configuration has been refactored and renamed to be MessageBus. Prior to EdgeX 3.0, Core/Support Services and Device services had it as MessageQueue and Applications Services had it as MessageBus under the Trigger configuration. Now all services have it as top level MessageBus. In addition to the rename, the following fields have been add or removed:

New Settings

• Disabled - Defaults to false. Set to true by Application Services that don't need the EdgeX MessageBus for Trigger or Metrics. When set to false this allows for Metrics to still be published to the EdgeX MessageBus when the Trigger is set to http or external-mqtt
• BaseTopicPrefix - Base topic prefix that is prepended to all the new topic constants. Defaults to edgex if not set.

Removed Settings

• PublishTopicPrefix - Topics are no longer configurable, except for BaseTopicPrefix
• SubscribeTopic - Topics are no longer configurable, except for BaseTopicPrefix
• Topics - Topics are no longer configurable, except for BaseTopicPrefix
• SubscribeEnabled - No longer needed by Core Data. If Core Data's PersistData is set totrue the Core Data will always subscribe to events from the EdgeX MessageBus

Custom MessageBus configuration

If your deployment has customized any of the EdgeX provided service's MessageBus configuration, you will need to re-apply your customizations to the EdgeX 3.0 version of the service's MessageBus configuration in the new separated out common configuration.

  MessageBus:
    Protocol: "redis"
    Host: "localhost"
    Port: 6379
    Type: "redis"
    AuthMode: "usernamepassword"  # required for redis MessageBus (secure or insecure).
    SecretName: "redisdb"
    BaseTopicPrefix: "edgex" # prepended to all topics as "edgex/<additional topic levels>
    Optional:
      # Default MQTT Specific options that need to be here to enable environment variable overrides of them
      Qos:  "0" # Quality of Service values are 0 (At most once), 1 (At least once) or 2 (Exactly once)
      KeepAlive: "10" # Seconds (must be 2 or greater)
      Retained: "false"
      AutoReconnect: "true"
      ConnectTimeout: "5" # Seconds
      SkipCertVerify: "false"
      # Additional Default NATS Specific options that need to be here to enable environment variable overrides of them
      Format: "nats"
      RetryOnFailedConnect: "true"
      QueueGroup: ""
      Durable: ""
      AutoProvision: "true"
      Deliver: "new"
      DefaultPubRetryAttempts: "2"
      Subject: "edgex/#" # Required for NATS JetStream only for stream auto-provisioning

With the separation of Common Configuration, each service needs set the Optional.ClientId in their private configuration to a unique value

MessageBus:
  Optional:
    ClientId: "core-data"

Database

In EdgeX 3.0 the database configuration for Core/Support services has changed from Databases map[string]bootstrapConfig.Database to Database bootstrapConfig.Database. This aligns it with the database configuration used by Application Services

Database:
  Host: "localhost"
  Port: 6379
  Timeout: "5s"
  Type: "redisdb"

SecretStore

In EdgeX 3.0 the SecretStore settings have been remove from the service configuration and are now controlled via default values and environment variable overrides. The environment variable override names have not changed. See SecretStore Configuration Overrides section for more details.

If you have customized SecretStore configuration, simply remove the SecretStore section and use environment variable overrides to apply your customizations.

InscureSecrets

In EdgeX 3.0 some InsecureSecrets configuration fields names have changed.

• Path - Renamed to SecretName
• Secrets - Renamed to SecretData

    InsecureSecrets:
      DB:
        SecretName: "redisdb"
        SecretData:
          username: ""
          password: ""

Custom InsecureSecrets

In File

If you have customized InsecureSecrets in the configuration file you will need to adjust the field names described above.

Via Environment Variable Overrides.

If you have used Environment Variable Overrides to customize InsecureSecrets , the Environment Variable names will need to change to account for the new field names above.

WRITABLE_INSECURESECRETS_<KEY>_SECRETNAME: mySecretName
WRITABLE_INSECURESECRETS_<KEY>_SECRETDATA_<DATAKEY>: mySecretDataItem