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Publish Events to Elasticsearch

MinIO supports publishing bucket notification events to an Elasticsearch service endpoint.

MinIO relies on the olivere/elastic v7 project for Elastic connectivity. The elastic/v7 library specifically targets Elasticsearch v7.0 and is not compatible with earlier Elasticsearch versions.

Add a Elasticsearch Endpoint to a MinIO Deployment

The following procedure adds a new Elasticsearch service endpoint for supporting bucket notifications in a MinIO deployment.

Important

This procedure requires restarting all minio server processes associated to the deployment at the same time. There is typically a brief period of time during which API operations are interrupted or may fail.

Applications using an S3-compatible SDK with built-in retry logic or which implement manual retry logic typically experience no notable interruption in services. For applications which cannot use retry-logic, consider scheduling a maintenance period to minimize interruption of services while performing this procedure.

Prerequisites

Elasticsearch v7.0 and later

MinIO relies on the olivere/elastic v7 project for Elastic connectivity. The elastic/v7 library specifically targets Elasticsearch v7.0 and is not compatible with earlier Elasticsearch versions.

MinIO mc Command Line Tool

This procedure uses the mc command line tool for certain actions. See the mc Quickstart for installation instructions.

1) Add the Elasticsearch Endpoint to MinIO

You can configure a new Elasticsearch service endpoint using either environment variables or by setting runtime configuration settings.

MinIO supports specifying the Elasticsearch service endpoint and associated configuration settings using environment variables. The minio server process applies the specified settings on its next startup.

The following example code sets all environment variables related to configuring an Elasticsearch service endpoint. The minimum required variables are:

set MINIO_NOTIFY_ELASTICSEARCH_ENABLE_<IDENTIFIER>="on"
set MINIO_NOTIFY_ELASTICSEARCH_URL_<IDENTIFIER>="<ENDPOINT>"
set MINIO_NOTIFY_ELASTICSEARCH_INDEX_<IDENTIFIER>="<string>"
set MINIO_NOTIFY_ELASTICSEARCH_FORMAT_<IDENTIFIER>="<string>"
set MINIO_NOTIFY_ELASTICSEARCH_USERNAME_<IDENTIFIER>="<string>"
set MINIO_NOTIFY_ELASTICSEARCH_PASSWORD_<IDENTIFIER>="<string>"
set MINIO_NOTIFY_ELASTICSEARCH_QUEUE_DIR_<IDENTIFIER>="<string>"
set MINIO_NOTIFY_ELASTICSEARCH_QUEUE_LIMIT_<IDENTIFIER>="<string>"
set MINIO_NOTIFY_ELASTICSEARCH_COMMENT_<IDENTIFIER>="<string>"
  • Replace <IDENTIFIER> with a unique descriptive string for the TARGET service endpoint. Use the same <IDENTIFIER> value for all environment variables related to the new target service endpoint. The following examples assume an identifier of PRIMARY.

    If the specified <IDENTIFIER> matches an existing Elasticsearch service endpoint on the MinIO deployment, the new settings override any existing settings for that endpoint. Use mc admin config get notify_elasticsearch to review the currently configured Elasticsearch endpoints on the MinIO deployment.

  • Replace <ENDPOINT> with the URL of the Elasticsearch service endpoint. For example:

See Elasticsearch Service for Bucket Notifications for complete documentation on each environment variable.

MinIO supports adding or updating Elasticsearch endpoints on a running minio server process using the mc admin config set command and the notify_elasticsearch configuration key. You must restart the minio server process to apply any new or updated configuration settings.

The following example code sets all settings related to configuring an Elasticsearch service endpoint. The minimum required settings are:

mc admin config set ALIAS/ notify_elasticsearch:IDENTIFIER \
   url="ENDPOINT" \
   index="<string>" \
   format="<string>" \
   username="<string>" \
   password="<string>" \
   queue_dir="<string>" \
   queue_limit="<string>" \
   comment="<string>"
  • Replace IDENTIFIER with a unique descriptive string for the Elasticsearch service endpoint. The following examples in this procedure assume an identifier of PRIMARY.

    If the specified IDENTIFIER matches an existing Elasticsearch service endpoint on the MinIO deployment, the new settings override any existing settings for that endpoint. Use mc admin config get notify_elasticsearch to review the currently configured Elasticsearch endpoints on the MinIO deployment.

  • Replace ENDPOINT with the URL of the Elasticsearch service endpoint. For example:

    https://user:password@hostname:port

See Elasticsearch Bucket Notification Configuration Settings for complete documentation on each setting.

2) Restart the MinIO Deployment

You must restart the MinIO deployment to apply the configuration changes. Use the mc admin service restart command to restart the deployment.

Important

MinIO restarts all minio server processes associated to the deployment at the same time. Applications may experience a brief period of downtime during the restart process.

Consider scheduling the restart during a maintenance period to minimize interruption of services.

mc admin service restart ALIAS

Replace ALIAS with the alias of the deployment to restart.

The minio server process prints a line on startup for each configured Elasticsearch target similar to the following:

SQS ARNs: arn:minio:sqs::primary:elasticsearch

You must specify the ARN resource when configuring bucket notifications with the associated Elasticsearch deployment as a target.

3) Configure Bucket Notifications using the Elasticsearch Endpoint as a Target

Use the mc event add command to add a new bucket notification event with the configured Elasticsearch service as a target:

mc event add ALIAS/BUCKET arn:minio:sqs::primary:elasticsearch \
  --event EVENTS
  • Replace ALIAS with the alias of a MinIO deployment.

  • Replace BUCKET with the name of the bucket in which to configure the event.

  • Replace EVENTS with a comma-separated list of events for which MinIO triggers notifications.

Use mc event list to view all configured bucket events for a given notification target:

mc event list ALIAS/BUCKET arn:minio:sqs::primary:Elasticsearch

4) Validate the Configured Events

Perform an action on the bucket for which you configured the new event and check the Elasticsearch service for the notification data. The action required depends on which events were specified when configuring the bucket notification.

For example, if the bucket notification configuration includes the s3:ObjectCreated:Put event, you can use the mc cp command to create a new object in the bucket and trigger a notification.

mc cp ~/data/new-object.txt ALIAS/BUCKET

Update an Elasticsearch Endpoint in a MinIO Deployment

The following procedure updates an existing Elasticsearch service endpoint for supporting bucket notifications in a MinIO deployment.

Important

This procedure requires restarting all minio server processes associated to the deployment at the same time. There is typically a brief period of time during which API operations are interrupted or may fail.

Applications using an S3-compatible SDK with built-in retry logic or which implement manual retry logic typically experience no notable interruption in services. For applications which cannot use retry-logic, consider scheduling a maintenance period to minimize interruption of services while performing this procedure.

Prerequisites

Elasticsearch v7.0 and later

MinIO relies on the olivere/elastic v7 project for Elastic connectivity. The elastic/v7 library specifically targets Elasticsearch v7.0 and is not compatible with earlier Elasticsearch versions.

MinIO mc Command Line Tool

This procedure uses the mc command line tool for certain actions. See the mc Quickstart for installation instructions.

1) List Configured Elasticsearch Endpoints In The Deployment

Use the mc admin config get command to list the currently configured Elasticsearch service endpoints in the deployment:

mc admin config get ALIAS/ notify_elasticsearch

Replace ALIAS with the alias of the MinIO deployment.

The command output resembles the following:

notify_elasticsearch:primary  queue_dir="" queue_limit="0"  url="https://user:password@hostname:port" format="namespace" index=""
notify_elasticsearch:secondary queue_dir="" queue_limit="0"  url="https://user:password@hostname:port" format="namespace" index=""

The notify_elasticsearch key is the top-level configuration key for an Elasticsearch Service for Bucket Notifications. The url key specifies the Elasticsearch service endpoint for the given notify_elasticsearch key. The notify_elasticsearch:<IDENTIFIER> suffix describes the unique identifier for that Elasticsearch service endpoint.

Note the identifier for the Elasticsearch service endpoint you want to update for the next step.

2) Update the Elasticsearch Endpoint

Use the mc admin config set command to set the new configuration for the Elasticsearch service endpoint:

mc admin config set ALIAS/ notify_elasticsearch:<IDENTIFIER> \
   url="https://user:password@hostname:port" \
   index="<string>" \
   format="<string>" \
   username="<string>" \
   password="<string>" \
   queue_dir="<string>" \
   queue_limit="<string>" \
   comment="<string>"

The notify_elasticsearch url configuration setting is the minimum required for an Elasticsearch service endpoint. All other configuration settings are optional. See Elasticsearch Service for Bucket Notifications for a complete list of Elasticsearch configuration settings.

3) Restart the MinIO Deployment

You must restart the MinIO deployment to apply the configuration changes. Use the mc admin service restart command to restart the deployment.

Important

MinIO restarts all minio server processes associated to the deployment at the same time. Applications may experience a brief period of downtime during the restart process.

Consider scheduling the restart during a maintenance period to minimize interruption of services.

mc admin service restart ALIAS

Replace ALIAS with the alias of the deployment to restart.

The minio server process prints a line on startup for each configured Elasticsearch target similar to the following:

SQS ARNs: arn:minio:sqs::primary:elasticsearch

3) Validate the Changes

Perform an action on a bucket which has an event configuration using the updated Elasticsearch service endpoint and check the Elasticsearch service for the notification data. The action required depends on which events were specified when configuring the bucket notification.

For example, if the bucket notification configuration includes the s3:ObjectCreated:Put event, you can use the mc cp command to create a new object in the bucket and trigger a notification.

mc cp ~/data/new-object.txt ALIAS/BUCKET