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Reference Hardware
MQTT Notification Settings
This page documents settings for configuring an MQTT service as a target for Bucket Notifications. See Publish Events to MQTT for a tutorial on using these settings.
You can establish or modify settings by defining:
an environment variable on the host system prior to starting or restarting the MinIO Server. Refer to your operating system’s documentation for how to define an environment variable.
a configuration setting using
mc admin config set.a configuration setting using the MinIO Console’s Administrator > Settings pages.
If you define both an environment variable and the similar configuration setting, MinIO uses the environment variable value.
Some settings have only an environment variable or a configuration setting, but not both.
Important
Each configuration setting controls fundamental MinIO behavior and functionality. MinIO strongly recommends testing configuration changes in a lower environment, such as DEV or QA, before applying to production.
Multiple MQTT Targets
You can specify multiple MQTT service endpoints by appending a unique identifier _ID for each set of related MQTT settings to the top level key.
For example, the following commands set two distinct MQTT service endpoints as PRIMARY and SECONDARY, respectively:
set MINIO_NOTIFY_MQTT_ENABLE_PRIMARY="on"
set MINIO_NOTIFY_MQTT_BROKER_PRIMARY="tcp://user:password@mqtt-endpoint.example.net:1883"
set MINIO_NOTIFY_MQTT_ENABLE_SECONDARY="on"
set MINIO_NOTIFY_MQTT_BROKER_SECONDARY="tcp://user:password@mqtt-endpoint.example.net:1883"
mc admin config set notify_mqtt:primary \
broker="tcp://endpoint:port" \
topic="minio/bucket-name/events/" \
username="username" \
password="password" \
[ARGUMENT="VALUE"] ... \
mc admin config set notify_mqtt:secondary \
broker="tcp://endpoint:port" \
topic="minio/bucket-name/events/" \
username="username" \
password="password" \
[ARGUMENT="VALUE"] ... \
With these settings, MINIO_NOTIFY_MQTT_ENABLE_PRIMARY indicates the environment variable is associated to an MQTT service endpoint with an ID of PRIMARY.
Settings
Enable
Required
Specify on to enable publishing bucket notifications to an MQTT endpoint.
Defaults to off.
The top-level configuration key for defining an MQTT server/broker endpoint for use with MinIO bucket notifications.
Use mc admin config set to set or update an MQTT server/broker endpoint.
The following arguments are required for each endpoint:
usernameOptional if MQTT server/broker does not enforce authentication/authorizationpasswordOptional if MQTT server/broker does not enforce authentication/authorization
Specify additional optional arguments as a whitespace (" ")-delimited list.
mc admin config set notify_mqtt \
broker="tcp://endpoint:port" \
topic="minio/bucket-name/events/" \
username="username" \
password="password" \
[ARGUMENT="VALUE"] ... \
Broker
Required
Specify the MQTT server/broker endpoint. MinIO supports TCP, TLS, or Websocket connections to the server/broker URL. For example:
tcp://mqtt.example.net:1883tls://mqtt.example.net:1883ws://mqtt.example.net:1883
Changed in version RELEASE.2023-05-27T05-56-19Z: MinIO checks the health of the specified URL (if it is resolvable and reachable) prior to adding the target. MinIO no longer blocks adding new notification targets if existing targets are offline.
Topic
Required
Specify the name of the MQTT topic to associate with events published by MinIO to the MQTT endpoint.
Username
Required if the MQTT server/broker enforces authentication/authorization
Specify the MQTT username MinIO should use to authenticate to the MQTT server/broker.
Password
Required if the MQTT server/broker enforces authentication/authorization
Specify the password for the MQTT username MinIO uses to authenticate to the MQTT server/broker.
Changed in version RELEASE.2023-06-23T20-26-00Z: MinIO redacts this value when returned as part of mc admin config get.
Quality of Service
Optional
Specify the Quality of Service priority for the published events.
Defaults to 0.
Keep Alive Interval
Optional
Specify the keep-alive interval for the MQTT connections. MinIO supports the following units of time measurement:
s- seconds, “60s”m- minutes, “60m”h- hours, “24h”d- days, “7d”
Reconnect Interval
Optional
Specify the reconnect interval for the MQTT connections. MinIO supports the following units of time measurement:
s- seconds, “60s”m- minutes, “60m”h- hours, “24h”d- days, “7d”
Queue Directory
Optional
Specify the directory path to enable MinIO’s persistent event store for undelivered messages, such as /opt/minio/events.
MinIO stores undelivered events in the specified store while the MQTT server/broker is offline and replays the stored events when connectivity resumes.
Queue Limit
Optional
Specify the maximum limit for undelivered messages.
Defaults to 100000.
Comment
Optional
Specify a comment to associate with the MQTT configuration.
