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    • Loading data from Object Storage to Managed Service for ClickHouse® using Data Transfer
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In this article:

  • Required paid resources
  • Getting started
  • Prepare the test data
  • Prepare and activate your transfer
  • Test the transfer
  • Delete the resources you created
  1. Building a data platform
  2. Migrating data with change of storage from Managed Service for OpenSearch to Managed Service for ClickHouse® using Data Transfer

Copying data from Managed Service for OpenSearch to Managed Service for ClickHouse® using Yandex Data Transfer

Written by
Yandex Cloud
Updated at May 5, 2025
  • Required paid resources
  • Getting started
  • Prepare the test data
  • Prepare and activate your transfer
  • Test the transfer
  • Delete the resources you created

With Data Transfer, you can transfer data from a Managed Service for OpenSearch source cluster to Managed Service for ClickHouse®.

To transfer data:

  1. Prepare the source cluster.
  2. Prepare and activate your transfer.
  3. Test the transfer.

If you no longer need the resources you created, delete them.

Required paid resourcesRequired paid resources

The support cost includes:

  • Managed Service for OpenSearch cluster fee: Using computing resources allocated to hosts (including hosts with the MANAGER role) and disk space (see Managed Service for OpenSearch pricing).
  • Managed Service for ClickHouse® cluster fee: Using computing resources allocated to hosts (including ZooKeeper hosts) and disk space (see Managed Service for ClickHouse® pricing).
  • Fee for using public IP addresses for cluster hosts (see Virtual Private Cloud pricing).
  • Per-transfer fee: Using computing resources and the number of transferred data rows (see Data Transfer pricing).

Getting startedGetting started

Prepare the data transfer infrastructure:

Manually
Terraform
  1. Create a Managed Service for OpenSearch source cluster in any suitable configuration with publicly available hosts.

  2. In the same availability zone, create a Managed Service for ClickHouse® target cluster in any suitable configuration with publicly available hosts.

    If you are going to connect to the cluster via Yandex WebSQL, enable WebSQL access in the cluster settings.

  3. Get an SSL certificate to connect to the Managed Service for OpenSearch cluster.

  4. Make sure that security groups of the Managed Service for OpenSearch and Managed Service for ClickHouse® clusters allow connecting from the internet.

  1. If you do not have Terraform yet, install it.

  2. Get the authentication credentials. You can add them to environment variables or specify them later in the provider configuration file.

  3. Configure and initialize a provider. There is no need to create a provider configuration file manually, you can download it.

  4. Place the configuration file in a separate working directory and specify the parameter values. If you did not add the authentication credentials to environment variables, specify them in the configuration file.

  5. Download the opensearch-to-clickhouse.tf configuration file to the same working directory.

    This file describes:

    • Network.
    • Subnet.
    • Security group and rules required to connect to the Managed Service for OpenSearch and Managed Service for ClickHouse® clusters.
    • Managed Service for OpenSearch source cluster with the admin user.
    • Managed Service for ClickHouse® target cluster with a user and database.
    • Target endpoint.
    • Transfer.
  6. In the opensearch-to-clickhouse.tf file, specify the following settings:

    • source_admin_password: admin user password in Managed Service for OpenSearch cluster.

    • mos_version: OpenSearch version.

    • mch_db_name: Database name in Managed Service for ClickHouse® cluster.

    • mch_username: Username in Managed Service for ClickHouse® cluster.

    • mch_user_password: User password in Managed Service for ClickHouse® cluster.

    • source_endpoint_id: Source endpoint ID.

    • profile_name: Your YC CLI profile name.

      If you do not have the Yandex Cloud CLI yet, install and initialize it.

  7. Make sure the Terraform configuration files are correct using this command:

    terraform validate
    

    If there are any errors in the configuration files, Terraform will point them out.

  8. Create the required infrastructure:

    1. Run this command to view the planned changes:

      terraform plan
      

      If you described the configuration correctly, the terminal will display a list of the resources to update and their parameters. This is a verification step that does not apply changes to your resources.

    2. If everything looks correct, apply the changes:

      1. Run this command:

        terraform apply
        
      2. Confirm updating the resources.

      3. Wait for the operation to complete.

    All the required resources will be created in the specified folder. You can check resource availability and their settings in the management console.

Prepare the test dataPrepare the test data

  1. In the source cluster, create a test index named people and set its schema:

    curl --cacert ~/.opensearch/root.crt \
         --user <source_cluster_username>:<user_password_in_source_cluster> \
         --header 'Content-Type: application/json' \
         --request PUT 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people' && \
    curl --cacert ~/.opensearch/root.crt \
         --user <source_cluster_username>:<user_password_in_source_cluster> \
         --header 'Content-Type: application/json' \
         --request PUT 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_mapping?pretty' \
         --data'
         {
               "properties": {
                  "name": {"type": "text"},
                  "age": {"type": "integer"}
               }
         }
         '
    
  2. Populate the test index with data:

    curl --cacert ~/.opensearch/root.crt \
         --user <source_cluster_username>:<user_password_in_source_cluster> \
         --header 'Content-Type: application/json' \
         --request POST 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_doc/?pretty' \
         --data'
         {
               "name": "Alice",
               "age": "30"
         }
         ' && \
    curl --cacert ~/.opensearch/root.crt \
         --user <source_cluster_username>:<user_password_in_source_cluster> \
         --header 'Content-Type: application/json' \
         --request POST 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_doc/?pretty' \
         --data'
         {
               "name": "Robert",
               "age": "32"
         }
         '
    
  3. Optionally, check the data in the test index:

    curl --cacert ~/.opensearch/root.crt \
         --user <username_in_target_cluster>:<user_password_in_target_cluster> \
         --header 'Content-Type: application/json' \
         --request GET 'https://<address_of_OpenSearch_host_with_DATA_role>:9200/people/_search?pretty'
    

Prepare and activate your transferPrepare and activate your transfer

  1. Create a source endpoint for the Managed Service for OpenSearch cluster you created earlier with the following settings:

    • Database type: OpenSearch
    • Connection settings:
      • Connection type: Managed Service for OpenSearch cluster
      • Managed Service for OpenSearch cluster: Select a Managed Service for OpenSearch cluster from the list.
      • User: admin
      • Password: admin user password.
  2. Create a target endpoint and transfer:

    Manually
    Terraform
    1. Create a target endpoint:

      • Database type: ClickHouse
      • Endpoint parameters:
        • Connection type: Select Managed cluster.
        • Managed cluster: Select a Managed Service for ClickHouse® cluster from the list.
        • User: Enter a name for the Managed Service for ClickHouse® cluster user.
        • Password: Enter a password for the Managed Service for ClickHouse® cluster user.
        • Database: Enter a name for the Managed Service for ClickHouse® cluster database.
    2. Create a transfer of the Snapshot type that will use the created endpoints.

    3. Activate the transfer.

    1. In the opensearch-to-clickhouse.tf file, specify the following parameter values:

      • source_endpoint_id: ID of the source endpoint.
      • transfer_enabled: 1 for creating a target endpoint and transfer.
    2. Make sure the Terraform configuration files are correct using this command:

      terraform validate
      

      If there are any errors in the configuration files, Terraform will point them out.

    3. Create the required infrastructure:

      1. Run this command to view the planned changes:

        terraform plan
        

        If you described the configuration correctly, the terminal will display a list of the resources to update and their parameters. This is a verification step that does not apply changes to your resources.

      2. If everything looks correct, apply the changes:

        1. Run this command:

          terraform apply
          
        2. Confirm updating the resources.

        3. Wait for the operation to complete.

      Once created, your transfer will be activated automatically.

Test the transferTest the transfer

  1. Wait for the transfer status to change to Completed.

  2. Make sure the data from the source Managed Service for OpenSearch cluster has been moved to the Managed Service for ClickHouse® database:

    Yandex WebSQL
    CLI
    1. Create a connection to the Managed Service for ClickHouse® cluster database.

    2. Make sure the database contains the people table with test data. To do this, run this query to the database via the connection you created:

      SELECT * FROM people;
      
    1. Get an SSL certificate to connect to the Managed Service for ClickHouse® cluster.

    2. If you do not have clickhouse-client, install it.

    3. Connect to the database in the Managed Service for ClickHouse® cluster.

    4. Make sure the database contains the people table with test data:

      SELECT * FROM people;
      

Delete the resources you createdDelete the resources you created

Some resources are not free of charge. To avoid paying for them, delete the resources you no longer need:

  1. Delete the source endpoint.

  2. Delete other resources depending on how they were created:

    Manually
    Terraform
    1. Delete the transfer.

    2. Delete the target endpoint.

    3. Delete the Managed Service for OpenSearch cluster.

    4. Delete the Managed Service for ClickHouse® cluster.

      The connection to the Managed Service for ClickHouse® cluster database in Yandex WebSQL will be deleted automatically.

    5. Delete the subnet.

    6. Delete the network.

    1. In the terminal window, go to the directory containing the infrastructure plan.

      Warning

      Make sure the directory has no Terraform manifests with the resources you want to keep. Terraform deletes all resources that were created using the manifests in the current directory.

    2. Delete resources:

      1. Run this command:

        terraform destroy
        
      2. Confirm deleting the resources and wait for the operation to complete.

      All the resources described in the Terraform manifests will be deleted.

ClickHouse® is a registered trademark of ClickHouse, Inc.

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